<div style="text-align:justify;"> Peanut oil oxidation was to monitor and quantify combining synchronous fluorescence spectroscopy and chemometrics. Peanut oil was subjected to an accelerated oxidation...<div style="text-align:justify;"> Peanut oil oxidation was to monitor and quantify combining synchronous fluorescence spectroscopy and chemometrics. Peanut oil was subjected to an accelerated oxidation testing. The spectral and related chemical indicators were caught during oxidation induce testing. Fluorescence spectra were gained for each sample with simultaneous excitation from 200 to 800 nm and the offsets (Δλ) of 10 to 180 nm during the oxidation process. The results showed the induce period (IP) of the peanut oil was 16.45 h. Parallel factor analysis (PARAFAC) was performed to select the best Δλ interval of 70 nm, which spectral data was the most suitable for interval partial least square (iPLS) and synergy interval PLS (siPLS) modeling and forecast. The study presented all interval selection methods had the better results than the global spectrum modelling. iPLS reached the best into 10 intervals with a ratio of prediction to deviation (RPD) of 2.10. siPLS that separated the whole spectrum into 15 intervals and combined the third intervals (282 to 320 nm, 362 to 400 nm, and 761 to 800 nm) had a ratio of RPD of 2.26. The results showed the optimal siPLS model performed a little better than iPLS. The established model lying on interval selection could improve the prediction accuracy. It could provide a quick, accurate method to monitor oil oxidation process. </div>展开更多
A model HA-type polymer of para-benzoquinone synthetic humic acid (SHA) and its complexes with copper, iron and manganese metal ions were studied using atomic force microscopy (AFM). Natural humic acids (HA) and synth...A model HA-type polymer of para-benzoquinone synthetic humic acid (SHA) and its complexes with copper, iron and manganese metal ions were studied using atomic force microscopy (AFM). Natural humic acids (HA) and synthetic humic acids (SHA) were examined by fluorescence spectroscopy, which indicated similarity of SHA and HA spectra. The AFM images of SHA and its complexes revealed variable morphologies, such as small spheres, aggregates and a sponge-like structure. The SHA complexes displayed morphologies similar to those of natural HA. The presence of copper, iron and manganese ions led to the formation of aggregate-type structures in an apparent arrangement of smaller SHA particles.展开更多
Igneous and sedimentary rocks contain an amount of natural radioactivity (NORM). U-238, Th-232 and their decay products, and K-40 are important sources of gamma-radiation. Knowledge of the radionuclide content of rock...Igneous and sedimentary rocks contain an amount of natural radioactivity (NORM). U-238, Th-232 and their decay products, and K-40 are important sources of gamma-radiation. Knowledge of the radionuclide content of rocks is necessary to estimate the exposure of the population to the radiation. Many types of rocks are used in building and industries, thus the radiation detection is important, it provides a baseline map of levels of the radioactivity in the study region. The purpose of this study is to evaluate the activity concentrations of the natural radionuclides (U-238 (Ra-226), Th-232 and K-40) and the fallout nuclide (Cs-137) (if found) in thirty samples of igneous and sedimentary rocks of Al-Atawilah (Al-Baha). The samples were collected and prepared during 2018/2019, and analyzed with a good experimental instrument (High energy resolution γ-ray spectroscopy with HPGe detector), also these rock samples were analyzed with X-ray fluorescence to subdivided these rocks based on the major oxides proportions contained of each sample. The mean activity concentrations of naturally radionuclides were found in the igneous rock samples varied depending on the type of the igneous rock. For sedimentary rock samples, the activity concentrations were found high for quartz sandstone sample, which may be due to its high proportion of SiO<sub>2</sub> and K<sub>2</sub>O. The estimated mean values of absorbed dose rate are within the permissible limit value. The findings indicate high dose level values in granite (rhyolite) and most of diorite (andesite) igneous rock samples while gabbro (basalt) igneous rock samples (except for one sample) record low levels of dose rate. All sedimentary rock samples have low dose rate (except for the quartz sand-stone sample).展开更多
Spectral analysis was a method of identifying substances, determining their chemical composition and calculating their content based on their spectral characteristics. This paper mainly discussed the application of va...Spectral analysis was a method of identifying substances, determining their chemical composition and calculating their content based on their spectral characteristics. This paper mainly discussed the application of various spectroscopic techniques, mainly including atomic absorption spectrometry (AAS) inductively coupled plasma emission spectrometry (ICP-AES) X-ray fluorescence spectroscopy (XRF) atomic fluorescence spectroscopy (AFS) direct reading spectroscopy (OES) glow discharge emission spectroscopy (GD-OSE) laser-induced breakdown spectroscopy (LIBS), in the formulation of non-ferrous metal standards in China. The AAS method was the most widely used single-element microanalysis method among the non-ferrous metal standards. The ICP-AES method was good at significant advantages in the simultaneous detection of multiple elements. The XRF method was increasingly used in the determination of primary and secondary trace elements due to its simple sample preparation and high efficiency. The AFS was mostly detected by single-element trace analysis. OES GD-OES and LIBS were playing an increasingly important role in the new demand area for non-ferrous metals. This paper discussed matrix elimination, sample digestion, sample preparation, instrument categories and other aspects of some standards, and summarized the advantages of spectral analysis and traditional chemical analysis methods. The new methods of future spectroscopic technology had been illustrated in the process of developing non-ferrous metal standards.展开更多
To correct spectral peak drift and obtain more reliable net counts,this study proposes a long short-term memory(LSTM)model fused with a convolutional neural network(CNN)to accurately estimate the relevant parameters o...To correct spectral peak drift and obtain more reliable net counts,this study proposes a long short-term memory(LSTM)model fused with a convolutional neural network(CNN)to accurately estimate the relevant parameters of a nuclear pulse signal by learning of samples.A predefined mathematical model was used to train the CNN-LSTM model and generate a dataset composed of distorted pulse sequences.The trained model was validated using simulated pulses.The relative errors in the amplitude estimation of pulse sequences with different degrees of distortion were obtained using triangular shaping,CNN-LSTM,and LSTM models.As a result,for severely distorted pulses,the relative error of the CNN-LSTM model in estimating the pulse parameters was reduced by 14.35%compared with that of the triangular shaping algorithm.For slightly distorted pulses,the relative error of the CNN-LSTM model was reduced by 0.33%compared with that of the triangular shaping algorithm.The model was then evaluated considering two performance indicators,the correction ratio and the efficiency ratio,which represent the proportion of the increase in peak area of the two characteristic peak regions of interest(ROIs)to the peak area of the corrected characteristic peak ROI and the proportion of the increase in peak area of the two characteristic peak ROIs to the peak areas of the two shadow peak ROI,respectively.Ten measurement results of the iron ore samples indicate that approximately 86.27%of the decreased peak area of the shadow peak ROI was corrected to the characteristic peak ROI,and the proportion of the corrected peak area to the peak area of the characteristic peak ROI was approximately 1.72%.The proposed CNN-LSTM model can be applied to X-ray energy spectrum correction,which is of great significance for X-ray spectroscopy and elemental content analyses.展开更多
Traditional Chinese medicine(TCM)is a treasure of the Chinese nation,providing effective solutions to current medical requisites.Various spectral techniques are undergoing continuous development and provide new and re...Traditional Chinese medicine(TCM)is a treasure of the Chinese nation,providing effective solutions to current medical requisites.Various spectral techniques are undergoing continuous development and provide new and reliable means for evaluating the efficacy and quality of TCM.Because spectral techniques are noninvasive,convenient,and sensitive,they have been widely applied to in vitro and in vivo TCM evaluation systems.In this paper,previous achievements and current progress in the research on spectral technologies(including fluorescence spectroscopy,photoacoustic imaging,infrared thermal imaging,laser-induced breakdown spectroscopy,hyperspectral imaging,and surface enhanced Raman spectroscopy)are discussed.The advantages and disadvantages of each technology are also presented.Moreover,the future applications of spectral imaging to identify the origins,components,and pesticide residues of TCM in vitro are elucidated.Subsequently,the evaluation of the efficacy of TCM in vivo is presented.Identifying future applications of spectral imaging is anticipated to promote medical research as well as scientific and technological explorations.展开更多
Background: The deep understanding of pathogenesis is a key moment in the formation of the modern strategy of modern medicine. We conducted the thorough analysis of the microscopic processes occurring in the bodies of...Background: The deep understanding of pathogenesis is a key moment in the formation of the modern strategy of modern medicine. We conducted the thorough analysis of the microscopic processes occurring in the bodies of patients with purulent-septic complications. The modified pathogenetic concept of the diagnostic and treatment model of diseases with septic complications is presented. The obtained information about the mechanisms of origin and development of these diseases is fundamentally important for finding the modern effective methods of treating patients. The aim of the research is to modify treatment tactics for patients with sepsis and burn injuries based on the modified pathogenetic concept using modern diagnostics, i.e. the method of fluorescence spectroscopy (MFS) and biomarkers. Materials and Methods: The proposed modified pathogenetic concept of the diagnostic and treatment model of diseases with purulent-septic complications along with standard methods was used successfully for effective treatment of 15 patients with sepsis and 25 with burn injuries. Results: 3 main scenarios of behaviour of spectral-fluorescence characteristics of patients with sepsis are illustrated. Spectral-fluorescence markers of sepsis were studied, which are informative 24 to 48 hours before the appearance of obvious clinical and laboratory signs of significant changes in the general somatic status of patients. Conclusions: The proposed diagnostic and therapeutic approach is new and fundamentally important for diagnostics and monitoring of the process of treatment of patients with purulent-septic diseases and burn injuries. An in-depth understanding of the dynamics of septic complications and the corresponding changes of the main markers of these diseases during treatment is especially relevant. The use of infusion therapy with solutions of donor albumin as an effective pathogenetic treatment is scientifically justified.展开更多
<strong>Background: </strong>The main causes of mortality in patients with burn injury are the development of systemic inflammatory process, multiple organ failure and septic complications. <strong>T...<strong>Background: </strong>The main causes of mortality in patients with burn injury are the development of systemic inflammatory process, multiple organ failure and septic complications. <strong>The aim of the research:</strong> Improvement of diagnostic and therapeutic approaches to the detection and elimination of endogenous intoxication in patients with burn injury. <strong>Materials and methods:</strong> The main study group consisted of 19 patients and the comparison group—of 10 patients with burn injury. 92 blood serum (BS) samples of the patients of the main group were tested, using the method of fluorescence spectroscopy (MFS). The advanced therapeutic tactics were proposed for the patients of both groups. The control group consisted of 40 healthy individuals (donors). BS of these patients was also tested using MFS. <strong>Results: </strong>Patients with burn injury have endogenous intoxication in their blood. The effective concentration of albumin is reduced in patients with burn injury due to the blockage of albumin binding centers by bacterial metabolism products. Fluorescence spectra (FS) of BS in patients with burn trauma and donors were obtained and investigated. Based on MFS results, an improved treatment regimen using infusion of albumin solution was proposed. <strong>Conclusions:</strong> An improved technique for the management of patients with burn injury is based on the use of MFS for the diagnostic evaluation of endogenous intoxication in them. The idea of pathological changes in albumin molecules in patients with burn injury is pathogenetically substantiated by the successful use of infusion of albumin solution in these patients on the basis of the MFS.展开更多
Background:Retinol dehydrogenase 8(RDH8)is a 312-amino acid(aa)protein involved in the visual cycle.Bound to the outer segment disk membranes of photoreceptors,it reduces all-trans-retinal to all-trans-retinol1 as one...Background:Retinol dehydrogenase 8(RDH8)is a 312-amino acid(aa)protein involved in the visual cycle.Bound to the outer segment disk membranes of photoreceptors,it reduces all-trans-retinal to all-trans-retinol1 as one of the rate-limiting steps of the visual cycle2.RDH8 is a member of the short-chain dehydrogenase/reductase family.Its C-terminal segment allows its membrane-anchoring through the postulated presence of an amphipathicα-helix and of 1 to 3 acyl groups at positions 299,302 and 3043.The secondary structure and membrane binding characteristics of RDH8 and its C-terminal segment have not yet been described.Methods:To evaluate the membrane binding of RDH8,the full-length protein(aa 1-312),a truncated form(aa 1-296),its C-terminal segment(aa 281-312 and 297-312)as well as different additional variants of this segment were used.The truncated protein binds membranes less efficiently than the full-length form.Thus,the C-terminal segment of RDH8 is essential for the binding and has thus been further examined.The intrinsic fluorescence of tryptophan residues at positions 289 and 310 of the wild-type C-terminal segment of RDH8 and the mutants W289F,W310F and W310R have thus been used to determine their extent of binding to lipid vesicles and to monitor their local environment.Unilamellar lipid vesicles composed of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine(POPC)or a mixture of POPC and 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-L-serine(POPS)were used to mimic the phospholipid content of the outer segment disk membranes of photoreceptors.Results:An increase in fluorescence intensity and in fluorescence lifetime is observed upon increasing the concentration of lipid vesicles.These data allowed calculating values of partition coefficient of the C-terminal segment of RDH8 varying between Kp=1.1 E6 to 1.7 E6.It is noteworthy that the observation of a more intense shift to lower wavelengths upon membrane binding of the mutant W310R and W310F indicates a deeper incorporation of the remaining tryptophan residue at position 289 into the lipid bilayer.The secondary structure of the C-terminal segment of RDH8 observed by circular dichroism and infrared spectroscopy shows a superposition ofα-helical,β-turn and unordered structures.Conclusions:The peptides derived from the C-terminal segment of RDH8 show a strong binding to lipid vesicles.These strength of binding is independent of the type of lipid and the presence of a mutation.展开更多
<strong>Background:</strong> Poor treatment of burns can lead to sepsis and even death. Especially promising is the use of the method of fluorescence spectroscopy for its diagnostics. <strong>The aim...<strong>Background:</strong> Poor treatment of burns can lead to sepsis and even death. Especially promising is the use of the method of fluorescence spectroscopy for its diagnostics. <strong>The aim of the research</strong> is to create a pathogenetic concept as the basis of a diagnostic and treatment model of purulent-inflammatory diseases and sepsis. <strong>Material and methods:</strong> The study lasted from 2001 to 2019 and included 4 stages. The experimental base of luminescent research at all stages was the luminescence laboratory of the Department of Experimental Physics of the Ivan Franko National University of Lviv. The study was performed by using optical monochromators MDR-2 and MDR-12. The excitation of the blood serum was performed with light with a wavelength of 280 nm, which corresponds to the glow region of human serum albumin. <strong>Results: </strong>The main indicators, used for the analysis, were the fluorescence intensity (<em>I</em><sub><em>F</em></sub>) and the position of the maximum fluorescence band (<em>λ</em><sub>max</sub>). The object of the study was samples of the blood serum of patients of the main and control groups. In the case of the presence of endogenous intoxication in the body, albumin binding centers are blocked by the products of bacterial metabolism and therefore such “pathological” albumin is unable to perform its functions, including transport and detoxification. <strong>Conclusions:</strong> The pathogenetic concept as the basis of the diagnostic and treating model of purulent-inflammatory diseases and sepsis was devised. In particular, the important role of albumin solution infusion in the treatment of the above-mentioned diseases was established.展开更多
<strong>Background: </strong>The significant improvement of immediate and long-term functional results of treating patients is the fundamental problem of modern medical science. A deep understanding of the...<strong>Background: </strong>The significant improvement of immediate and long-term functional results of treating patients is the fundamental problem of modern medical science. A deep understanding of the pathogenesis is the key point in creating the management strategy for patients with various diseases. Information about the mechanisms of origin and development of purulent-inflammatory diseases and sepsis is essential for finding effective ways to prevent and treat them. <strong>The aim of the research</strong> is to use the method of fluorescence spectroscopy in creating the pathogenetic diagnostic and treatment model for the prevention and treatment of purulent-inflammatory diseases and sepsis, modification of treatment tactics, search for new markers of purulent-septic diseases, as well as monitoring of patients during the treatment. <strong>Materials and methods: </strong>The proposed approach, along with standard diagnostic methods, was used to organize the treatment process of 100 patients with purulent-inflammatory diseases, including 15 patients with sepsis, 35 with acute inflammatory abdominal pathology, 20 patients with burn injury (main group) and 35 patients with burn injury (comparison group). <strong>Results:</strong> The behavior of spectral-fluorescent characteristics in their dynamics has been studied, and the new markers for assessing patients’ conditions have been proposed. Their effectiveness for the diagnosis of purulent-septic diseases has been proved, which advances the results of standard research methods by 24 - 48 hours.<strong> Conclusions:</strong> The proposed diagnostic and treatment approach is fundamentally important for diagnosis and monitoring during the treatment of patients with purulent-septic diseases. Particularly relevant is the proposal to modify the treatment process for these patients, associated with the use of infusion of donor albumin solutions.展开更多
Dissolved organic matter(DOM)in surface waters can vary markedly in character depending on seasonal variations such as rainfall intensity,UV radiations and temperature.Changes in DOM as well as temperature and rainfal...Dissolved organic matter(DOM)in surface waters can vary markedly in character depending on seasonal variations such as rainfall intensity,UV radiations and temperature.Changes in DOM as well as temperature and rainfall intensity over the year can affect the biochemical processes occurring in bank filtration(BF).Identification and characterization of DOM in the surface water could help to optimize the water treatment and provide stable and safe drinking water.This study investigated year-long variations of DOM concentrations and compositions in a surface water of a circulated outdoor pond(research facility)connected to a BF passage.DOM was dominated by humic substances and a changing pattern of DOM in surface water was observed throughout the year.A significant increase of DOM(~38%)in surface water was noted in August compared to November.The fluorescent DOM showed that DOM in summer was enriched with the degradable fraction whilst non-degradable fraction was dominated in winter.A constant(1.7±0.1 mg/L)effluent DOM was recirculated in the system throughout the year.DOM removal through BF varied between 4%to 39%and was achieved within a few meters after infiltration and significantly correlated with influent DOM concentration(R^(2)=0.82,p<0.05).However,no significant(p>0.05)change in the removal of DOM was observed in two subsurface layers(upper and lower).This study highlights the presence of a constant non-degradable DOM in the bank filtrate,which was not affected by temperature,redox conditions and UV radiations.展开更多
Formaldehyde(FA)plays critical roles in Alzheimer's disease and the associations between FA and Alzheimer's disease(AD)are still obscure.To reveal FA fluxes in the Alzheimer's disease brain,an activity-bas...Formaldehyde(FA)plays critical roles in Alzheimer's disease and the associations between FA and Alzheimer's disease(AD)are still obscure.To reveal FA fluxes in the Alzheimer's disease brain,an activity-based fluorescence probe NP-FA with superb blood-brain barrier permeable abilities was exquisitely designed.The probe responded to FA with significant fluorescence increases(F/F0=81),thus laying the foundation for the sensitive detection of FA in cuvette and in vivo.Moreover,the probe also possessed some fasci-nating performances,including endoplasmic reticulum(ER)-targeting abilities,good one-photon/two-photon absorption properties,and appropriate hydrophobicity property(log P=2.34±0.05).As a result,the probe can readily reflect the overproduction of FA con-tent in live cells under ER stress by high-fidelity two-photon imaging.More interestingly,ex vivo imaging of AD brains and two-photon imaging of AD slice tissues visually disclosed that the FA level of AD brain is much higher than that of the normal brain.This work afforded a specific activity-based probe for the imaging of FA in the AD mouse brains,which could be further extended to FA-related studies in Alzheimer's disease.展开更多
Over the past few decades,the metal elements(MEs)in atmospheric particles have aroused great attention.Some well-established techniques have been used to measure particlebound MEs.However,each method has its own advan...Over the past few decades,the metal elements(MEs)in atmospheric particles have aroused great attention.Some well-established techniques have been used to measure particlebound MEs.However,each method has its own advantages and disadvantages in terms of complexity,accuracy,and specific elements of interest.In this study,the performances of inductively coupled plasma-optical emission spectrometry(ICP-OES)and total reflection X-ray fluorescence spectroscopy(TXRF)were evaluated for quality control to analyze data accuracy and precision.The statistic methods(Deming regression and significance testing)were applied for intercomparison between ICP-OES and TXRF measurements for same lowloading PM_(2.5)samples in Weizhou Island.The results from the replicate analysis of standard filters(SRM 2783)and field filters samples indicated that 10 MEs(K,Ca,V,Cr,Mn,Fe,Ni,Cu,Zn,and Pb)showed good accuracies and precision for both techniques.The higher accuracy tended to the higher precision in the MEs analysis process.In addition,the interlab comparisons illustrated that V and Mn all had good agreements between ICP-OES and TXRF.The measurements of K,Cu and Zn were more reliable by TXRF analysis for low-loading PM_(2.5).ICP-OES was more accurate for the determinations for Ca,Cr,Ni and Pb,owing to the overlapping spectral lines and low sensitivity during TXRF analysis.The measurements of Fe,influenced by low-loading PM_(2.5),were not able to determine which instrument could obtain more reliable results.These conclusions could provide reference information to choose suitable instrument for the determination of MEs in low-loading PM_(2.5)samples.展开更多
Hypochlorite(ClO^(-))is an important reactive oxygen species produced by the immune system to fight off invading pathogens,but its over-expression can interfere with normal physiological process and induce serious dis...Hypochlorite(ClO^(-))is an important reactive oxygen species produced by the immune system to fight off invading pathogens,but its over-expression can interfere with normal physiological process and induce serious diseases.Although a variety of molecular probes have been reported for detecting ClO^(-),the development of advanced fluorescent tools with faster response and higher sensitivity to precisely monitor ClO^(-)remains a challenge.In this work,two Hantzsch ester(a derivative of 1,4-dihydropyridine)derived fluorescent probes MeDHP-BCl and MeDHP-PhBCl were constructed based on asymmetric BODIPY-matrix.These probes exhibit significant fluorescence turn-on in the ultra-sensitive(detection limit<1 nmol/L)and ultra-fast response(≤5 s)to ClO^(-).The reaction has been determined to be a highly selective N-chlorination of Hantzsch ester which cannot be activated by various common bioactive species,including nitric oxide(NO)that could oxidize Hantzsch ester under aerobic physiological conditions in most reports.MeDHP-PhBCl possessed a relatively longer fluorescence emission wavelength and higher quantum yield after activation,while more notably,MeDHP-BCl displayed lower cytotoxicity and more remarkable fluorescence increment in the response to ClO^(-),enabling selective and precise visualization of endogenous ClO^(-)over-expression in living RAW264.7 cells.展开更多
Here,we combined the photon antibunching analysis,fluorescence correlation spectroscopy,and time-domain fluorescence lifetime imaging microscopy(TD-FLIM)to study the emission properties of a representative AIE-lumino...Here,we combined the photon antibunching analysis,fluorescence correlation spectroscopy,and time-domain fluorescence lifetime imaging microscopy(TD-FLIM)to study the emission properties of a representative AIE-luminogen—4,4’-(benzo[c][1,2,5]thiadiazole-4,7-diyl)bis(N,N-diphenylaniline)(TPA-BT)at the single emitter level in a tetrahydrofuran(THF)/water solution where water is a non-solvent for TPA-BT.Our findings suggest that,at a constant water fraction in the solution,the size of TPA-BT aggregates increases with the TPA-BT concentration;TPA-BT aggregates are not a quantum emitter at room temperature in the solution.Moreover,utilizing TD-FLIM and a gel trapping technique allowed us to study the fluorescence lifetime of individual TPA-BT aggregates.Adding a polar solvent like water does not result in an overall decrease in fluorescence lifetime.Rather,it causes the fluorescence lifetime distribution to become wider,and only some molecules experience a decrease in their fluorescence lifetime.These results could represent a step forward in further understanding the photophysics of AIE-luminogens.展开更多
Catalytic ozonation is widely employed in advanced wastewater treatment owing to its high mineralization of refractory organics.The key to high mineralization is the compatibility between catalyst formulation and wast...Catalytic ozonation is widely employed in advanced wastewater treatment owing to its high mineralization of refractory organics.The key to high mineralization is the compatibility between catalyst formulation and wastewater quality.Machine learning can greatly improve experimental efficiency,while fluorescence data can provide additional wastewater quality information on the composition and concentration of organics,which is conducive to optimizing catalyst formulation.In this study,machine learning combined with fluorescence spectroscopy was applied to develop ozonation catalysts(Mn/g-Al_(2)O_(3)catalyst was used as an example).Based on the data collected from 52 different catalysts,a machine-learning model was established to predict catalyst performance.The correlation coefficient between the experimental and model-predicted values was 0.9659,demonstrating the robustness and good generalization ability of the model.The range of the catalyst formulations was preliminarily screened by fluorescence spectroscopy.When the wastewater was dominated by tryptophan-like and soluble microbial products,the impregnation concentration and time of Mn(NO_(3))_(2) were less than 0.3 mol L^(-1)and 10 h,respectively.Furthermore,the optimized Mn/g-Al_(2)O_(3)formulation obtained by the model was impregnation with 0.155 mol L^(-1)Mn(NO_(3))_(2)solution for 8.5 h and calcination at 600℃ for 3.5 h.The model-predicted and experimental values for total organic carbon removal were 54.48% and 53.96%,respectively.Finally,the improved catalytic performance was attributed to the synergistic effect of oxidation(·OH and ^(1)O_(2))and the Mn/g-Al_(2)O_(3) catalyst.This study provides a rapid approach to catalyst design based on the characteristics of wastewater quality using machine learning combined with fluorescence spectroscopy.展开更多
Elucidating the intrinsic relationship between viscosity/H_(2)0_(2) and mitochondria-associated diseases remains a great challenge owing to the lack of research on multiple diseases models,such as inflammation and mal...Elucidating the intrinsic relationship between viscosity/H_(2)0_(2) and mitochondria-associated diseases remains a great challenge owing to the lack of research on multiple diseases models,such as inflammation and malignant tumor models.In this work,we have developed a mitochondria-specific orange/near-infrared-emissive fluorescent probe TTPB,for dual-imaging of viscosity and H_(2)0_(2) levels in two different channels.The probe exhibited a remarkable response to viscosity with NIR emission round 666 nm,and was highly sensitive to H_(2)0_(2) in orange channel with emission peak at 586 nm.Moreover,TTPB has good mitochondria-specific ability and permits individual detecting of viscosity in NIR channels and H_(2)0_(2) levels in orange channel in living cells.More notably,TTPB was successfully applied to simultaneously image the viscosity and H_(2)0_(2) levels in inflammation and cancer models.展开更多
文摘<div style="text-align:justify;"> Peanut oil oxidation was to monitor and quantify combining synchronous fluorescence spectroscopy and chemometrics. Peanut oil was subjected to an accelerated oxidation testing. The spectral and related chemical indicators were caught during oxidation induce testing. Fluorescence spectra were gained for each sample with simultaneous excitation from 200 to 800 nm and the offsets (Δλ) of 10 to 180 nm during the oxidation process. The results showed the induce period (IP) of the peanut oil was 16.45 h. Parallel factor analysis (PARAFAC) was performed to select the best Δλ interval of 70 nm, which spectral data was the most suitable for interval partial least square (iPLS) and synergy interval PLS (siPLS) modeling and forecast. The study presented all interval selection methods had the better results than the global spectrum modelling. iPLS reached the best into 10 intervals with a ratio of prediction to deviation (RPD) of 2.10. siPLS that separated the whole spectrum into 15 intervals and combined the third intervals (282 to 320 nm, 362 to 400 nm, and 761 to 800 nm) had a ratio of RPD of 2.26. The results showed the optimal siPLS model performed a little better than iPLS. The established model lying on interval selection could improve the prediction accuracy. It could provide a quick, accurate method to monitor oil oxidation process. </div>
基金The authors acknowledge CAPES(Coordenação de Aperfeiçoamento de Pessoal de Nível Superior)and CNPq(Conselho Nacional de Desenvolvimento Científico e Tecnológico)process 302756/2009-4 for their financial supportEMBRAPA(Empresa Brasileira de Pesqui-sa Agropecuária)for its structural support of this work
文摘A model HA-type polymer of para-benzoquinone synthetic humic acid (SHA) and its complexes with copper, iron and manganese metal ions were studied using atomic force microscopy (AFM). Natural humic acids (HA) and synthetic humic acids (SHA) were examined by fluorescence spectroscopy, which indicated similarity of SHA and HA spectra. The AFM images of SHA and its complexes revealed variable morphologies, such as small spheres, aggregates and a sponge-like structure. The SHA complexes displayed morphologies similar to those of natural HA. The presence of copper, iron and manganese ions led to the formation of aggregate-type structures in an apparent arrangement of smaller SHA particles.
文摘Igneous and sedimentary rocks contain an amount of natural radioactivity (NORM). U-238, Th-232 and their decay products, and K-40 are important sources of gamma-radiation. Knowledge of the radionuclide content of rocks is necessary to estimate the exposure of the population to the radiation. Many types of rocks are used in building and industries, thus the radiation detection is important, it provides a baseline map of levels of the radioactivity in the study region. The purpose of this study is to evaluate the activity concentrations of the natural radionuclides (U-238 (Ra-226), Th-232 and K-40) and the fallout nuclide (Cs-137) (if found) in thirty samples of igneous and sedimentary rocks of Al-Atawilah (Al-Baha). The samples were collected and prepared during 2018/2019, and analyzed with a good experimental instrument (High energy resolution γ-ray spectroscopy with HPGe detector), also these rock samples were analyzed with X-ray fluorescence to subdivided these rocks based on the major oxides proportions contained of each sample. The mean activity concentrations of naturally radionuclides were found in the igneous rock samples varied depending on the type of the igneous rock. For sedimentary rock samples, the activity concentrations were found high for quartz sandstone sample, which may be due to its high proportion of SiO<sub>2</sub> and K<sub>2</sub>O. The estimated mean values of absorbed dose rate are within the permissible limit value. The findings indicate high dose level values in granite (rhyolite) and most of diorite (andesite) igneous rock samples while gabbro (basalt) igneous rock samples (except for one sample) record low levels of dose rate. All sedimentary rock samples have low dose rate (except for the quartz sand-stone sample).
文摘Spectral analysis was a method of identifying substances, determining their chemical composition and calculating their content based on their spectral characteristics. This paper mainly discussed the application of various spectroscopic techniques, mainly including atomic absorption spectrometry (AAS) inductively coupled plasma emission spectrometry (ICP-AES) X-ray fluorescence spectroscopy (XRF) atomic fluorescence spectroscopy (AFS) direct reading spectroscopy (OES) glow discharge emission spectroscopy (GD-OSE) laser-induced breakdown spectroscopy (LIBS), in the formulation of non-ferrous metal standards in China. The AAS method was the most widely used single-element microanalysis method among the non-ferrous metal standards. The ICP-AES method was good at significant advantages in the simultaneous detection of multiple elements. The XRF method was increasingly used in the determination of primary and secondary trace elements due to its simple sample preparation and high efficiency. The AFS was mostly detected by single-element trace analysis. OES GD-OES and LIBS were playing an increasingly important role in the new demand area for non-ferrous metals. This paper discussed matrix elimination, sample digestion, sample preparation, instrument categories and other aspects of some standards, and summarized the advantages of spectral analysis and traditional chemical analysis methods. The new methods of future spectroscopic technology had been illustrated in the process of developing non-ferrous metal standards.
基金This work was supported by the Open Project of the Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology(No.NLK2022-05)Central Government Guidance Funds for Local Scientific and Technological Development,China(No.Guike ZY22096024)+3 种基金Sichuan Natural Science Youth Fund Project(No.2023NSFSC1366)Open Research Fund of the National Engineering Research Center for Agro-Ecological Big Data Analysis&Application,Anhui University(No.AE202209)Research Fund of Guangxi Key Lab of Multi-source Information Mining&Security(MIMS22-04)National Natural Science Youth Foundation of China(No.12305214).
文摘To correct spectral peak drift and obtain more reliable net counts,this study proposes a long short-term memory(LSTM)model fused with a convolutional neural network(CNN)to accurately estimate the relevant parameters of a nuclear pulse signal by learning of samples.A predefined mathematical model was used to train the CNN-LSTM model and generate a dataset composed of distorted pulse sequences.The trained model was validated using simulated pulses.The relative errors in the amplitude estimation of pulse sequences with different degrees of distortion were obtained using triangular shaping,CNN-LSTM,and LSTM models.As a result,for severely distorted pulses,the relative error of the CNN-LSTM model in estimating the pulse parameters was reduced by 14.35%compared with that of the triangular shaping algorithm.For slightly distorted pulses,the relative error of the CNN-LSTM model was reduced by 0.33%compared with that of the triangular shaping algorithm.The model was then evaluated considering two performance indicators,the correction ratio and the efficiency ratio,which represent the proportion of the increase in peak area of the two characteristic peak regions of interest(ROIs)to the peak area of the corrected characteristic peak ROI and the proportion of the increase in peak area of the two characteristic peak ROIs to the peak areas of the two shadow peak ROI,respectively.Ten measurement results of the iron ore samples indicate that approximately 86.27%of the decreased peak area of the shadow peak ROI was corrected to the characteristic peak ROI,and the proportion of the corrected peak area to the peak area of the characteristic peak ROI was approximately 1.72%.The proposed CNN-LSTM model can be applied to X-ray energy spectrum correction,which is of great significance for X-ray spectroscopy and elemental content analyses.
基金supported by the National Key R&D Program of China(Grant No.:2017YFC1702003)the Chinese Academy of Medical Sciences Innovation Fund for Medical Sciences(Grant No.:2019e12M-5-078).
文摘Traditional Chinese medicine(TCM)is a treasure of the Chinese nation,providing effective solutions to current medical requisites.Various spectral techniques are undergoing continuous development and provide new and reliable means for evaluating the efficacy and quality of TCM.Because spectral techniques are noninvasive,convenient,and sensitive,they have been widely applied to in vitro and in vivo TCM evaluation systems.In this paper,previous achievements and current progress in the research on spectral technologies(including fluorescence spectroscopy,photoacoustic imaging,infrared thermal imaging,laser-induced breakdown spectroscopy,hyperspectral imaging,and surface enhanced Raman spectroscopy)are discussed.The advantages and disadvantages of each technology are also presented.Moreover,the future applications of spectral imaging to identify the origins,components,and pesticide residues of TCM in vitro are elucidated.Subsequently,the evaluation of the efficacy of TCM in vivo is presented.Identifying future applications of spectral imaging is anticipated to promote medical research as well as scientific and technological explorations.
文摘Background: The deep understanding of pathogenesis is a key moment in the formation of the modern strategy of modern medicine. We conducted the thorough analysis of the microscopic processes occurring in the bodies of patients with purulent-septic complications. The modified pathogenetic concept of the diagnostic and treatment model of diseases with septic complications is presented. The obtained information about the mechanisms of origin and development of these diseases is fundamentally important for finding the modern effective methods of treating patients. The aim of the research is to modify treatment tactics for patients with sepsis and burn injuries based on the modified pathogenetic concept using modern diagnostics, i.e. the method of fluorescence spectroscopy (MFS) and biomarkers. Materials and Methods: The proposed modified pathogenetic concept of the diagnostic and treatment model of diseases with purulent-septic complications along with standard methods was used successfully for effective treatment of 15 patients with sepsis and 25 with burn injuries. Results: 3 main scenarios of behaviour of spectral-fluorescence characteristics of patients with sepsis are illustrated. Spectral-fluorescence markers of sepsis were studied, which are informative 24 to 48 hours before the appearance of obvious clinical and laboratory signs of significant changes in the general somatic status of patients. Conclusions: The proposed diagnostic and therapeutic approach is new and fundamentally important for diagnostics and monitoring of the process of treatment of patients with purulent-septic diseases and burn injuries. An in-depth understanding of the dynamics of septic complications and the corresponding changes of the main markers of these diseases during treatment is especially relevant. The use of infusion therapy with solutions of donor albumin as an effective pathogenetic treatment is scientifically justified.
文摘<strong>Background: </strong>The main causes of mortality in patients with burn injury are the development of systemic inflammatory process, multiple organ failure and septic complications. <strong>The aim of the research:</strong> Improvement of diagnostic and therapeutic approaches to the detection and elimination of endogenous intoxication in patients with burn injury. <strong>Materials and methods:</strong> The main study group consisted of 19 patients and the comparison group—of 10 patients with burn injury. 92 blood serum (BS) samples of the patients of the main group were tested, using the method of fluorescence spectroscopy (MFS). The advanced therapeutic tactics were proposed for the patients of both groups. The control group consisted of 40 healthy individuals (donors). BS of these patients was also tested using MFS. <strong>Results: </strong>Patients with burn injury have endogenous intoxication in their blood. The effective concentration of albumin is reduced in patients with burn injury due to the blockage of albumin binding centers by bacterial metabolism products. Fluorescence spectra (FS) of BS in patients with burn trauma and donors were obtained and investigated. Based on MFS results, an improved treatment regimen using infusion of albumin solution was proposed. <strong>Conclusions:</strong> An improved technique for the management of patients with burn injury is based on the use of MFS for the diagnostic evaluation of endogenous intoxication in them. The idea of pathological changes in albumin molecules in patients with burn injury is pathogenetically substantiated by the successful use of infusion of albumin solution in these patients on the basis of the MFS.
文摘Background:Retinol dehydrogenase 8(RDH8)is a 312-amino acid(aa)protein involved in the visual cycle.Bound to the outer segment disk membranes of photoreceptors,it reduces all-trans-retinal to all-trans-retinol1 as one of the rate-limiting steps of the visual cycle2.RDH8 is a member of the short-chain dehydrogenase/reductase family.Its C-terminal segment allows its membrane-anchoring through the postulated presence of an amphipathicα-helix and of 1 to 3 acyl groups at positions 299,302 and 3043.The secondary structure and membrane binding characteristics of RDH8 and its C-terminal segment have not yet been described.Methods:To evaluate the membrane binding of RDH8,the full-length protein(aa 1-312),a truncated form(aa 1-296),its C-terminal segment(aa 281-312 and 297-312)as well as different additional variants of this segment were used.The truncated protein binds membranes less efficiently than the full-length form.Thus,the C-terminal segment of RDH8 is essential for the binding and has thus been further examined.The intrinsic fluorescence of tryptophan residues at positions 289 and 310 of the wild-type C-terminal segment of RDH8 and the mutants W289F,W310F and W310R have thus been used to determine their extent of binding to lipid vesicles and to monitor their local environment.Unilamellar lipid vesicles composed of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine(POPC)or a mixture of POPC and 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-L-serine(POPS)were used to mimic the phospholipid content of the outer segment disk membranes of photoreceptors.Results:An increase in fluorescence intensity and in fluorescence lifetime is observed upon increasing the concentration of lipid vesicles.These data allowed calculating values of partition coefficient of the C-terminal segment of RDH8 varying between Kp=1.1 E6 to 1.7 E6.It is noteworthy that the observation of a more intense shift to lower wavelengths upon membrane binding of the mutant W310R and W310F indicates a deeper incorporation of the remaining tryptophan residue at position 289 into the lipid bilayer.The secondary structure of the C-terminal segment of RDH8 observed by circular dichroism and infrared spectroscopy shows a superposition ofα-helical,β-turn and unordered structures.Conclusions:The peptides derived from the C-terminal segment of RDH8 show a strong binding to lipid vesicles.These strength of binding is independent of the type of lipid and the presence of a mutation.
文摘<strong>Background:</strong> Poor treatment of burns can lead to sepsis and even death. Especially promising is the use of the method of fluorescence spectroscopy for its diagnostics. <strong>The aim of the research</strong> is to create a pathogenetic concept as the basis of a diagnostic and treatment model of purulent-inflammatory diseases and sepsis. <strong>Material and methods:</strong> The study lasted from 2001 to 2019 and included 4 stages. The experimental base of luminescent research at all stages was the luminescence laboratory of the Department of Experimental Physics of the Ivan Franko National University of Lviv. The study was performed by using optical monochromators MDR-2 and MDR-12. The excitation of the blood serum was performed with light with a wavelength of 280 nm, which corresponds to the glow region of human serum albumin. <strong>Results: </strong>The main indicators, used for the analysis, were the fluorescence intensity (<em>I</em><sub><em>F</em></sub>) and the position of the maximum fluorescence band (<em>λ</em><sub>max</sub>). The object of the study was samples of the blood serum of patients of the main and control groups. In the case of the presence of endogenous intoxication in the body, albumin binding centers are blocked by the products of bacterial metabolism and therefore such “pathological” albumin is unable to perform its functions, including transport and detoxification. <strong>Conclusions:</strong> The pathogenetic concept as the basis of the diagnostic and treating model of purulent-inflammatory diseases and sepsis was devised. In particular, the important role of albumin solution infusion in the treatment of the above-mentioned diseases was established.
文摘<strong>Background: </strong>The significant improvement of immediate and long-term functional results of treating patients is the fundamental problem of modern medical science. A deep understanding of the pathogenesis is the key point in creating the management strategy for patients with various diseases. Information about the mechanisms of origin and development of purulent-inflammatory diseases and sepsis is essential for finding effective ways to prevent and treat them. <strong>The aim of the research</strong> is to use the method of fluorescence spectroscopy in creating the pathogenetic diagnostic and treatment model for the prevention and treatment of purulent-inflammatory diseases and sepsis, modification of treatment tactics, search for new markers of purulent-septic diseases, as well as monitoring of patients during the treatment. <strong>Materials and methods: </strong>The proposed approach, along with standard diagnostic methods, was used to organize the treatment process of 100 patients with purulent-inflammatory diseases, including 15 patients with sepsis, 35 with acute inflammatory abdominal pathology, 20 patients with burn injury (main group) and 35 patients with burn injury (comparison group). <strong>Results:</strong> The behavior of spectral-fluorescent characteristics in their dynamics has been studied, and the new markers for assessing patients’ conditions have been proposed. Their effectiveness for the diagnosis of purulent-septic diseases has been proved, which advances the results of standard research methods by 24 - 48 hours.<strong> Conclusions:</strong> The proposed diagnostic and treatment approach is fundamentally important for diagnosis and monitoring during the treatment of patients with purulent-septic diseases. Particularly relevant is the proposal to modify the treatment process for these patients, associated with the use of infusion of donor albumin solutions.
基金supported by the German Academic Exchange Service (DAAD)and Higher Education Commission (HEC),Pakistan。
文摘Dissolved organic matter(DOM)in surface waters can vary markedly in character depending on seasonal variations such as rainfall intensity,UV radiations and temperature.Changes in DOM as well as temperature and rainfall intensity over the year can affect the biochemical processes occurring in bank filtration(BF).Identification and characterization of DOM in the surface water could help to optimize the water treatment and provide stable and safe drinking water.This study investigated year-long variations of DOM concentrations and compositions in a surface water of a circulated outdoor pond(research facility)connected to a BF passage.DOM was dominated by humic substances and a changing pattern of DOM in surface water was observed throughout the year.A significant increase of DOM(~38%)in surface water was noted in August compared to November.The fluorescent DOM showed that DOM in summer was enriched with the degradable fraction whilst non-degradable fraction was dominated in winter.A constant(1.7±0.1 mg/L)effluent DOM was recirculated in the system throughout the year.DOM removal through BF varied between 4%to 39%and was achieved within a few meters after infiltration and significantly correlated with influent DOM concentration(R^(2)=0.82,p<0.05).However,no significant(p>0.05)change in the removal of DOM was observed in two subsurface layers(upper and lower).This study highlights the presence of a constant non-degradable DOM in the bank filtrate,which was not affected by temperature,redox conditions and UV radiations.
基金the National Natural Science Foundation of China(Nos.22174034,21804033,and 21625503)the Natural Science Foundation of Hubei Province(2021CFB305)。
文摘Formaldehyde(FA)plays critical roles in Alzheimer's disease and the associations between FA and Alzheimer's disease(AD)are still obscure.To reveal FA fluxes in the Alzheimer's disease brain,an activity-based fluorescence probe NP-FA with superb blood-brain barrier permeable abilities was exquisitely designed.The probe responded to FA with significant fluorescence increases(F/F0=81),thus laying the foundation for the sensitive detection of FA in cuvette and in vivo.Moreover,the probe also possessed some fasci-nating performances,including endoplasmic reticulum(ER)-targeting abilities,good one-photon/two-photon absorption properties,and appropriate hydrophobicity property(log P=2.34±0.05).As a result,the probe can readily reflect the overproduction of FA con-tent in live cells under ER stress by high-fidelity two-photon imaging.More interestingly,ex vivo imaging of AD brains and two-photon imaging of AD slice tissues visually disclosed that the FA level of AD brain is much higher than that of the normal brain.This work afforded a specific activity-based probe for the imaging of FA in the AD mouse brains,which could be further extended to FA-related studies in Alzheimer's disease.
基金supported by the National Natural Science Foundation of China(No.42075182)the Science and Technology Pre-research Project for Collaborative Prevention and Control on O3 and PM2.5 Compound Pollution(No.DQGG202026)the Three-dimensional Comprehensive Observation Research Program for O3and PM2.5Compound Pollution in Key Areas in Summer 2021(No.DQGG2021101)
文摘Over the past few decades,the metal elements(MEs)in atmospheric particles have aroused great attention.Some well-established techniques have been used to measure particlebound MEs.However,each method has its own advantages and disadvantages in terms of complexity,accuracy,and specific elements of interest.In this study,the performances of inductively coupled plasma-optical emission spectrometry(ICP-OES)and total reflection X-ray fluorescence spectroscopy(TXRF)were evaluated for quality control to analyze data accuracy and precision.The statistic methods(Deming regression and significance testing)were applied for intercomparison between ICP-OES and TXRF measurements for same lowloading PM_(2.5)samples in Weizhou Island.The results from the replicate analysis of standard filters(SRM 2783)and field filters samples indicated that 10 MEs(K,Ca,V,Cr,Mn,Fe,Ni,Cu,Zn,and Pb)showed good accuracies and precision for both techniques.The higher accuracy tended to the higher precision in the MEs analysis process.In addition,the interlab comparisons illustrated that V and Mn all had good agreements between ICP-OES and TXRF.The measurements of K,Cu and Zn were more reliable by TXRF analysis for low-loading PM_(2.5).ICP-OES was more accurate for the determinations for Ca,Cr,Ni and Pb,owing to the overlapping spectral lines and low sensitivity during TXRF analysis.The measurements of Fe,influenced by low-loading PM_(2.5),were not able to determine which instrument could obtain more reliable results.These conclusions could provide reference information to choose suitable instrument for the determination of MEs in low-loading PM_(2.5)samples.
基金financial support by the National Natural Science Foundation of China(22077030,22271092,21977018,82173657,21874043)the China Post-doctoral Science Foundation(Grant No.2021M701196).
文摘Hypochlorite(ClO^(-))is an important reactive oxygen species produced by the immune system to fight off invading pathogens,but its over-expression can interfere with normal physiological process and induce serious diseases.Although a variety of molecular probes have been reported for detecting ClO^(-),the development of advanced fluorescent tools with faster response and higher sensitivity to precisely monitor ClO^(-)remains a challenge.In this work,two Hantzsch ester(a derivative of 1,4-dihydropyridine)derived fluorescent probes MeDHP-BCl and MeDHP-PhBCl were constructed based on asymmetric BODIPY-matrix.These probes exhibit significant fluorescence turn-on in the ultra-sensitive(detection limit<1 nmol/L)and ultra-fast response(≤5 s)to ClO^(-).The reaction has been determined to be a highly selective N-chlorination of Hantzsch ester which cannot be activated by various common bioactive species,including nitric oxide(NO)that could oxidize Hantzsch ester under aerobic physiological conditions in most reports.MeDHP-PhBCl possessed a relatively longer fluorescence emission wavelength and higher quantum yield after activation,while more notably,MeDHP-BCl displayed lower cytotoxicity and more remarkable fluorescence increment in the response to ClO^(-),enabling selective and precise visualization of endogenous ClO^(-)over-expression in living RAW264.7 cells.
基金Financial support from the National Natural Science Foundation of China(Nos.22073091 and 21873094)National Key ResearchandDevelopmentProgram ofChina(No.2021YFC2101704)+1 种基金International Science and Technology Cooperation Program of Jilin,China(No.20220508126RC)Key Research Program of Frontier Sciences,Chinese Academy of Sciences(No.ZDBS-LY-SLHO33)is gratefully acknowledged。
文摘Here,we combined the photon antibunching analysis,fluorescence correlation spectroscopy,and time-domain fluorescence lifetime imaging microscopy(TD-FLIM)to study the emission properties of a representative AIE-luminogen—4,4’-(benzo[c][1,2,5]thiadiazole-4,7-diyl)bis(N,N-diphenylaniline)(TPA-BT)at the single emitter level in a tetrahydrofuran(THF)/water solution where water is a non-solvent for TPA-BT.Our findings suggest that,at a constant water fraction in the solution,the size of TPA-BT aggregates increases with the TPA-BT concentration;TPA-BT aggregates are not a quantum emitter at room temperature in the solution.Moreover,utilizing TD-FLIM and a gel trapping technique allowed us to study the fluorescence lifetime of individual TPA-BT aggregates.Adding a polar solvent like water does not result in an overall decrease in fluorescence lifetime.Rather,it causes the fluorescence lifetime distribution to become wider,and only some molecules experience a decrease in their fluorescence lifetime.These results could represent a step forward in further understanding the photophysics of AIE-luminogens.
基金supported by the Fundamental Research Funds for the Central Public-interest Scientific Institution 2022YSKY-70the National Key R&D Program of China(No.2020YFC1806302).
文摘Catalytic ozonation is widely employed in advanced wastewater treatment owing to its high mineralization of refractory organics.The key to high mineralization is the compatibility between catalyst formulation and wastewater quality.Machine learning can greatly improve experimental efficiency,while fluorescence data can provide additional wastewater quality information on the composition and concentration of organics,which is conducive to optimizing catalyst formulation.In this study,machine learning combined with fluorescence spectroscopy was applied to develop ozonation catalysts(Mn/g-Al_(2)O_(3)catalyst was used as an example).Based on the data collected from 52 different catalysts,a machine-learning model was established to predict catalyst performance.The correlation coefficient between the experimental and model-predicted values was 0.9659,demonstrating the robustness and good generalization ability of the model.The range of the catalyst formulations was preliminarily screened by fluorescence spectroscopy.When the wastewater was dominated by tryptophan-like and soluble microbial products,the impregnation concentration and time of Mn(NO_(3))_(2) were less than 0.3 mol L^(-1)and 10 h,respectively.Furthermore,the optimized Mn/g-Al_(2)O_(3)formulation obtained by the model was impregnation with 0.155 mol L^(-1)Mn(NO_(3))_(2)solution for 8.5 h and calcination at 600℃ for 3.5 h.The model-predicted and experimental values for total organic carbon removal were 54.48% and 53.96%,respectively.Finally,the improved catalytic performance was attributed to the synergistic effect of oxidation(·OH and ^(1)O_(2))and the Mn/g-Al_(2)O_(3) catalyst.This study provides a rapid approach to catalyst design based on the characteristics of wastewater quality using machine learning combined with fluorescence spectroscopy.
基金the National Natural Science Foundation of China(Nos.81901814 and 21874087)Natural Science Foundation of Shanxi Province(No.201801D121040)The animal experiments were approved by the Animal Care and Use Committee of Shanxi University,and performed in compliance with the Animal Management Rules of the Ministry of Health of the People's Republic of China(Document no.55,2001).
文摘Elucidating the intrinsic relationship between viscosity/H_(2)0_(2) and mitochondria-associated diseases remains a great challenge owing to the lack of research on multiple diseases models,such as inflammation and malignant tumor models.In this work,we have developed a mitochondria-specific orange/near-infrared-emissive fluorescent probe TTPB,for dual-imaging of viscosity and H_(2)0_(2) levels in two different channels.The probe exhibited a remarkable response to viscosity with NIR emission round 666 nm,and was highly sensitive to H_(2)0_(2) in orange channel with emission peak at 586 nm.Moreover,TTPB has good mitochondria-specific ability and permits individual detecting of viscosity in NIR channels and H_(2)0_(2) levels in orange channel in living cells.More notably,TTPB was successfully applied to simultaneously image the viscosity and H_(2)0_(2) levels in inflammation and cancer models.
