Despite the high efficiency that has been achieved for the perovskite solar cells(PSCs),the hazardous lead leakage from the perovskite absorber layer is one of the crucial barriers still hindering its penetration into...Despite the high efficiency that has been achieved for the perovskite solar cells(PSCs),the hazardous lead leakage from the perovskite absorber layer is one of the crucial barriers still hindering its penetration into the commercial market for a large-scale installation.Herein,we report a novel low-cost and biodegradable lead sequestration layer with high compatibility for up-scalable encapsulation of PSCs.Through a precisely designed cross-linking reaction of chemical agents,the as-made biodegradable chitosan composite film shows enhanced mechanical strength,chemical stability,and lead adsorption capacity.The designed encapsulation strategy reduces over 99.99% lead leakage to <2 ppb under varied simulations of weather conditions(hail,rain,or flood),which meet the safe level of drinking water set by the US Environmental Protection Agency(EPA).Moreover,the PSC efficiency is improved from 21.91% to22.82% due to the improved light absorption from the printed biodegradable lead absorption film.Finally,we present a prototype process of accumulation and recycling of lead compounds in PSCs derbies via the biodegradation process.Based on the low-cost biodegradable lead sequestration film,this environmental-friendly encapsulation strategy could address the lead leakage issue for further commercialization of PSCs.展开更多
In this work,an acoustic topology optimizationmethod for structural surface design covered by porous materials is proposed.The analysis of acoustic problems is performed using the isogeometric boundary elementmethod.T...In this work,an acoustic topology optimizationmethod for structural surface design covered by porous materials is proposed.The analysis of acoustic problems is performed using the isogeometric boundary elementmethod.Taking the element density of porousmaterials as the design variable,the volume of porousmaterials as the constraint,and the minimum sound pressure or maximum scattered sound power as the design goal,the topology optimization is carried out by solid isotropic material with penalization(SIMP)method.To get a limpid 0–1 distribution,a smoothing Heaviside-like function is proposed.To obtain the gradient value of the objective function,a sensitivity analysis method based on the adjoint variable method(AVM)is proposed.To find the optimal solution,the optimization problems are solved by the method of moving asymptotes(MMA)based on gradient information.Numerical examples verify the effectiveness of the proposed topology optimization method in the optimization process of two-dimensional acoustic problems.Furthermore,the optimal distribution of sound-absorbingmaterials is highly frequency-dependent and usually needs to be performed within a frequency band.展开更多
BACKGROUND Tuberculous uveitis caused by tuberculosis infection factors is common,but tuberculous uveitis caused by Mycobacterium tuberculosis found in the intraocular fluid is rare.This report describes the use of in...BACKGROUND Tuberculous uveitis caused by tuberculosis infection factors is common,but tuberculous uveitis caused by Mycobacterium tuberculosis found in the intraocular fluid is rare.This report describes the use of intraocular fluid in the diagnosis of tuberculous uveitis in a patient and reviews the relevant literature.CASE SUMMARY A 24-year-old woman who was 31-wk pregnant visited Hebei Chest Hospital due to intermittent chest pain,fever,and decreased vision for 3 mo.The hydrothorax test suggested“tuberculous pleurisy”,and yellow effusion was extracted from the chest tube twice resulting in a total volume of approximately 800 mL.The patient chose to continue the pregnancy without treatment,and was hospitalized again due to high fever.Following 2 mo of anti-tuberculosis treatment,a healthy boy was delivered by cesarean section.Tuberculous uveitis was diagnosed using tuberculosis Xpert,and intraocular infection was detected by second-generation gene sequencing.Following systemic treatment,the patient gradually improved,and the corrected visual acuity of the left eye gradually increased from 0.08 to 1.0.CONCLUSION The etiology of uveitis is complex,and it is necessary to assess the patient’s general condition and apply molecular biology methods to determine the pathogenesis and guide precise treatment,to improve clinicians’awareness and standardize treatment of the disease.展开更多
In today’s rapidly changing society,higher education is facing an urgent need to cultivate talents with innovative spirit and entrepreneurial ability.As the requirement of adapting to the development of the era,innov...In today’s rapidly changing society,higher education is facing an urgent need to cultivate talents with innovative spirit and entrepreneurial ability.As the requirement of adapting to the development of the era,innovation and entrepreneurship education has gradually become one of the important directions of teaching reform in colleges and universities.This article aims to explore its role and significance in improving the quality of education,cultivating students’comprehensive quality,and promoting social and economic development through in-depth research on the teaching reform practice in colleges and universities based on innovation and entrepreneurship education.The research will focus on the practical cases of innovation and entrepreneurship education in different universities,combining qualitative and quantitative research methods,from multiple dimensions such as curriculum design,teaching mode,and practice platform construction,to comprehensively analyze the scope and methods of innovation and entrepreneurship education in the teaching reform of universities,in order to provide useful guidelines for the reform of higher education.展开更多
In this paper, the feasibility study of chemical flooding is carried out for ultra-high porosity and high permeability heavy oil field with permeability higher than 10 μm<sup>2</sup> and porosity greater ...In this paper, the feasibility study of chemical flooding is carried out for ultra-high porosity and high permeability heavy oil field with permeability higher than 10 μm<sup>2</sup> and porosity greater than 35%. The viscosity-concentration relationship of four kinds of oil flooding systems such as hydrolyzed polyacrylamide, structural polymer A, structural polymer B and gel was studied. The results showed that the viscosity of ordinary polymer and structural polymer B was lower compared with other two types of oil displacement agents, and the viscosity of structural polymer A was higher. The higher the concentration, the higher the viscosity retention rate. The gel system has the highest viscosity and best anti-shear ability. The resistance coefficient and residual resistance coefficient of structural polymer A and gel system were further studied. The results show that permeability, velocity and polymer concentration all affect the resistance coefficient and residual resistance coefficient. From the point of view of resistance establishment ability, it is considered that structural polymer A is not suitable for permeability formation above 10 μm<sup>2</sup>. Gel system has stronger ability to establish resistance coefficient than structural polymer A flooding system, and it is more feasible for formation system with permeability above 10 μm<sup>2</sup>.展开更多
AIM:To compare the visual and optical performance of eyes with different corneal spherical aberration(SA) implanted with spherical aberration-free intraocular lens(IOLs).· METHODS:Thirty-six patients with differe...AIM:To compare the visual and optical performance of eyes with different corneal spherical aberration(SA) implanted with spherical aberration-free intraocular lens(IOLs).· METHODS:Thirty-six patients with different corneal SA had phacoemulsification with implantation of spherical aberration-free IOLs.Patients were divided into 3 groups according to the value of preoperative corneal SA.Eyes with corneal SA <0.10μm were assigned to group A,those with 0.10 ≤corneal SA <0.20μm to Group B,and those with 0.20≤corneal SA <0.35μm to Group C.Best-corrected visual acuity(BCVA),contrast sensitivity,corneal SA,total ocular aberrations,and depth of focus were recorded 3 months postoperatively.Distance-corrected near and intermediate visual acuity was studied to measure depth of focus.· RESULTS:BCVA and contrast sensitivity were similar between groups.There were no significant differences in distance-corrected near or intermediate visual acuity.Corneal SA was similar before and 3 months after surgery in the 3 groups.With a 5.0mm pupil diameter,root mean square values for total ocular higher-order aberrations(HOAs) were lower in groups A and B than in group C.Total ocular SA was lower in group A than in groups B and C.SA was also lower in group B than in group C.Coma and trefoil were similar between the groups.· CONCLUSION:Implantation of spherical aberration-free IOLs in eyes with different corneal SA results in similar visual performance at BCVA,contrast sensitivity and depth of focus.展开更多
The growth factor glucagon-like peptide-1(GLP-1) is neuroprotective in several animal models of neurodegeneration. Here, we analyzed the neuroprotective effects of a novel protease-resistant GLP-1 analogue,(Val^8)GLP-...The growth factor glucagon-like peptide-1(GLP-1) is neuroprotective in several animal models of neurodegeneration. Here, we analyzed the neuroprotective effects of a novel protease-resistant GLP-1 analogue,(Val^8)GLP-1-Glu-PAL, which has advantages over older analogues, such as improvement of hippocampal neurogenesis, glucose homeostasis, and insulin secretion. We established an in vitro model of Parkinson's disease using the mitochondrial stressor rotenone in primary cultured mouse neurons pretreated with(Val^8)GLP-1-Glu-PAL.(Val^8)GLP-1-Glu-PAL alone did not affect neuronal viability, but prevented the rotenone-induced reduction in cell viability in a dose-dependent manner. In addition,(Val^8)GLP-1-Glu-PAL pretreatment prevented rotenone-induced proapoptotic changes manifesting as downregulation of procaspase-3 and Bcl-2 and upregulation of cleaved caspase-3. These results demonstrate that the novel agent(Val^8)GLP-1-GluPAL shows promise as a drug treatment for Parkinson's disease.展开更多
The CD4 binding site(CD4bs) of envelope glycoprotein(Env) is an important conserved target for anti-human immunodeficiency virus type 1(HIV-1) neutralizing antibodies. Neutralizing monoclonal antibodies IgG1 b12(b12) ...The CD4 binding site(CD4bs) of envelope glycoprotein(Env) is an important conserved target for anti-human immunodeficiency virus type 1(HIV-1) neutralizing antibodies. Neutralizing monoclonal antibodies IgG1 b12(b12) could recognize conformational epitopes that overlap the CD4 bs of Env. Different virus strains, even derived from the same individual, showed distinct neutralization susceptibility to b12. We examined the key amino acid residues affecting b12 neutralization susceptibility using single genome amplification and pseudovirus neutralization assay. Eleven amino acid residues were identified that affect the sensitivity of Env to b12. Through site-directed mutagenesis, an amino acid substitution at position 182 in the V2 region of Env was confirmed to play a key role in regulating the b12 neutralization susceptibility. The introduction of V182 L to a resistant strain enhanced its sensitivity to b12 more than twofold. Correspondingly, the introduction of L182 V to a sensitive strain reduced its sensitivity to b12 more than tenfold. Amino acid substitution at positions 267 and 346 could both enhance the sensitivity to b12 more than twofold. However, no additive effect was observed when the three site mutageneses were introduced into the same strain, and the sensitivity was equivalent to the single V182 L mutation. CRF07_BC is a major circulating recombinant form of HIV-1 prevalent in China. Our data may provide important information for understanding the molecular mechanism regulating the neutralization susceptibility of CRF07_BC viruses to b12 and may be helpful for a vaccine design targeting the CD4 bs epitopes.展开更多
Chondroitin sulfate-mediated albumin corona nanoparticles were readily prepared without any chemical reaction,and their active tumor targeting and therapeutic effects were examined.Negatively charged chondroitin sulfa...Chondroitin sulfate-mediated albumin corona nanoparticles were readily prepared without any chemical reaction,and their active tumor targeting and therapeutic effects were examined.Negatively charged chondroitin sulfate(CS)and positively charged doxorubicin(DOX)self-assembled into nanoparticles(CS-DOX-NPs)via electrostatic interactions.Bovine serum albumin(BSA)was then adsorbed on the surface of CS-DOX-NPs to form albumin corona nanoparticles(BC-DOX-NPs)protected from endogenous proteins.Due to the dual effect of BSA and CS,BC-DOX-NPs interacted with the gp60,SPARC and CD44 receptors on tumor cells,facilitating their rapid and efficient transcytosis and improving their accumulation and uptake within tumor tissues.The simultaneous presence of BSA and CS also allowed BC-DOX-NPs to target CD44 efficiently,leading to greater cellular uptake and cytotoxicity against 4 T1 cells than CS-DOX-NPs or free DOX.Intravenous injection of BCDOX-NPs into orthotopic 4 T1 tumor-bearing mice led to greater drug accumulation at the tumor site than with CS-DOX-NPs or free DOX,resulting in significant inhibition of tumor growth and lower exposure of major organs to the drug.展开更多
BACKGROUND The prevalence of type 2 diabetes mellitus(T2DM)is rising rapidly in rural areas,and lifestyle interventions can effectively reduce the blood glucose levels of patients with T2DM.However,current dietary and...BACKGROUND The prevalence of type 2 diabetes mellitus(T2DM)is rising rapidly in rural areas,and lifestyle interventions can effectively reduce the blood glucose levels of patients with T2DM.However,current dietary and exercise guidelines are still at experimental stages and are difficult for subjects to understand and implement.The Human Metabolism Analyzer provides real life interventions for the prevention and treatment of T2DM,and our pilot research has demonstrated its effectiveness and good compliance.AIM To investigate the effect of and compliance with lifestyle interventions in rural patients with T2DM.METHODS A total of ten rural villages were randomly selected in Chaoshui Township,Penglai City,Shandong Province,China,to conduct health screening among residents aged 50 years or older.Each rural village represented a group,and 12 patients with T2DM were randomly selected from each group(total:120)to participate in this study and receive real life lifestyle interventions and medication guidance.Lifestyle interventions included changing the meal order(A),postprandial activities(B),resistance exercise(C),and reverse abdominal breathing(D).Diabetes education was conducted at least once a month with a weekly phone follow-up to monitor exercise and diet.Waist circumference,blood pressure,body mass index(BMI),motor function,body composition,fasting blood glucose,and glycated hemoglobin(HbA1c)were analyzed before and 3 mo after the intervention.Moreover,patient compliance and adjustments of hypoglycemic drugs were evaluated.RESULTS A total of 109 subjects completed the study.The compliance rates for lifestyle interventions A,B,C,and D were 57.79%,60.55%,64.22%,and 75.23%,respectively.Among the subjects who received hypoglycemic drugs,the dose was reduced 2 to 3 times based on blood glucose in 54(67.50%)subjects and was tapered and discontinued in 5(6.25%)subjects within 3 mo,with no significant fluctuations in blood glucose after dose reduction and withdrawal.After lifestyle interventions,waist circumference,BMI,fasting blood glucose,and HbA1c significantly decreased(P<0.001);motor function and body composition also significantly improved(P<0.001).CONCLUSION For patients with T2DM,compliance to real-life lifestyle interventions is good,and the interventions significantly improve metabolic indicators such as waist circumference,BMI,blood pressure,HbA1c,body composition,and motor function.Some patients are able to taper or discontinue hypoglycemic drugs.展开更多
Geniposide, a monomer extracted from gardenia and widely used in Chinese medicine, is a novel agonist at the glucagon-like peptide-1 receptor. This receptor is involved in neuroprotection. In the present study, we sou...Geniposide, a monomer extracted from gardenia and widely used in Chinese medicine, is a novel agonist at the glucagon-like peptide-1 receptor. This receptor is involved in neuroprotection. In the present study, we sought to identify an anti-apoptotic mechanism for the treatment of neurodegenerative diseases. Primary cultured neurons were treated with different concentrations of rotenone for 48 hours. Morphological observation, cell counting kit-8 assay, lactate dehydrogenase detection and western blot assay demonstrated that 0.5 n M rotenone increased lactate dehydrogenase release, decreased the expression of procaspase-3 and Bcl-2, and increased cleaved caspase-3 expression in normal neurons. All these effects were prevented by geniposide. Our results indicate that geniposide diminished rotenone-induced injury in primary neurons by suppressing apoptosis. This may be one of the molecular mechanisms underlying the efficacy of geniposide in the treatment of neurodegenerative diseases.展开更多
By applying smoothed l0norm(SL0)algorithm,a block compressive sensing(BCS)algorithm called BCS-SL0 is proposed,which deploys SL0 and smoothing filter for image reconstruction.Furthermore,BCS-ReSL0 algorithm is develop...By applying smoothed l0norm(SL0)algorithm,a block compressive sensing(BCS)algorithm called BCS-SL0 is proposed,which deploys SL0 and smoothing filter for image reconstruction.Furthermore,BCS-ReSL0 algorithm is developed to use regularized SL0(ReSL0)in a reconstruction process to deal with noisy situations.The study shows that the proposed BCS-SL0 takes less execution time than the classical BCS with smoothed projected Landweber(BCS-SPL)algorithm in low measurement ratio,while achieving comparable reconstruction quality,and improving the blocking artifacts especially.The experiment results also verify that the reconstruction performance of BCS-ReSL0 is better than that of the BCSSPL in terms of noise tolerance at low measurement ratio.展开更多
The quantum state-to-state calculations of the D + ND→N + D_2 reaction are performed on a potential energy surface of 4 A'' state. The state-resolved integral and differential cross sections and product state...The quantum state-to-state calculations of the D + ND→N + D_2 reaction are performed on a potential energy surface of 4 A'' state. The state-resolved integral and differential cross sections and product state distributions are calculated and discussed. It is found that the rotational distribution, rather than the vibrational distribution, of the product has an obvious inversion. Due to the fact that it is a small-impact-parameter collision, its product D_2 is mainly dominated by rebound mechanism, which can lead to backward scattering at low collision energy. As the collision energy increases, the forward scattering and sideward scattering begin to appear. In addition, the backward collision is also found to happen at high collision energy, through which we can know that both the rebound mechanism and stripping mechanism exist at high collision energy.展开更多
基金financially supported by the National Key Research and Development Plan (2019YFE0107200)the National Natural Science Foundation of China (52072284)the Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory (XHD2020-001)。
文摘Despite the high efficiency that has been achieved for the perovskite solar cells(PSCs),the hazardous lead leakage from the perovskite absorber layer is one of the crucial barriers still hindering its penetration into the commercial market for a large-scale installation.Herein,we report a novel low-cost and biodegradable lead sequestration layer with high compatibility for up-scalable encapsulation of PSCs.Through a precisely designed cross-linking reaction of chemical agents,the as-made biodegradable chitosan composite film shows enhanced mechanical strength,chemical stability,and lead adsorption capacity.The designed encapsulation strategy reduces over 99.99% lead leakage to <2 ppb under varied simulations of weather conditions(hail,rain,or flood),which meet the safe level of drinking water set by the US Environmental Protection Agency(EPA).Moreover,the PSC efficiency is improved from 21.91% to22.82% due to the improved light absorption from the printed biodegradable lead absorption film.Finally,we present a prototype process of accumulation and recycling of lead compounds in PSCs derbies via the biodegradation process.Based on the low-cost biodegradable lead sequestration film,this environmental-friendly encapsulation strategy could address the lead leakage issue for further commercialization of PSCs.
基金sponsored by Natural Science Foundation of Henan under Grant No.222300420498.
文摘In this work,an acoustic topology optimizationmethod for structural surface design covered by porous materials is proposed.The analysis of acoustic problems is performed using the isogeometric boundary elementmethod.Taking the element density of porousmaterials as the design variable,the volume of porousmaterials as the constraint,and the minimum sound pressure or maximum scattered sound power as the design goal,the topology optimization is carried out by solid isotropic material with penalization(SIMP)method.To get a limpid 0–1 distribution,a smoothing Heaviside-like function is proposed.To obtain the gradient value of the objective function,a sensitivity analysis method based on the adjoint variable method(AVM)is proposed.To find the optimal solution,the optimization problems are solved by the method of moving asymptotes(MMA)based on gradient information.Numerical examples verify the effectiveness of the proposed topology optimization method in the optimization process of two-dimensional acoustic problems.Furthermore,the optimal distribution of sound-absorbingmaterials is highly frequency-dependent and usually needs to be performed within a frequency band.
基金Supported by the Medical Science Research Project of Hebei Province,No.20191029。
文摘BACKGROUND Tuberculous uveitis caused by tuberculosis infection factors is common,but tuberculous uveitis caused by Mycobacterium tuberculosis found in the intraocular fluid is rare.This report describes the use of intraocular fluid in the diagnosis of tuberculous uveitis in a patient and reviews the relevant literature.CASE SUMMARY A 24-year-old woman who was 31-wk pregnant visited Hebei Chest Hospital due to intermittent chest pain,fever,and decreased vision for 3 mo.The hydrothorax test suggested“tuberculous pleurisy”,and yellow effusion was extracted from the chest tube twice resulting in a total volume of approximately 800 mL.The patient chose to continue the pregnancy without treatment,and was hospitalized again due to high fever.Following 2 mo of anti-tuberculosis treatment,a healthy boy was delivered by cesarean section.Tuberculous uveitis was diagnosed using tuberculosis Xpert,and intraocular infection was detected by second-generation gene sequencing.Following systemic treatment,the patient gradually improved,and the corrected visual acuity of the left eye gradually increased from 0.08 to 1.0.CONCLUSION The etiology of uveitis is complex,and it is necessary to assess the patient’s general condition and apply molecular biology methods to determine the pathogenesis and guide precise treatment,to improve clinicians’awareness and standardize treatment of the disease.
文摘In today’s rapidly changing society,higher education is facing an urgent need to cultivate talents with innovative spirit and entrepreneurial ability.As the requirement of adapting to the development of the era,innovation and entrepreneurship education has gradually become one of the important directions of teaching reform in colleges and universities.This article aims to explore its role and significance in improving the quality of education,cultivating students’comprehensive quality,and promoting social and economic development through in-depth research on the teaching reform practice in colleges and universities based on innovation and entrepreneurship education.The research will focus on the practical cases of innovation and entrepreneurship education in different universities,combining qualitative and quantitative research methods,from multiple dimensions such as curriculum design,teaching mode,and practice platform construction,to comprehensively analyze the scope and methods of innovation and entrepreneurship education in the teaching reform of universities,in order to provide useful guidelines for the reform of higher education.
文摘In this paper, the feasibility study of chemical flooding is carried out for ultra-high porosity and high permeability heavy oil field with permeability higher than 10 μm<sup>2</sup> and porosity greater than 35%. The viscosity-concentration relationship of four kinds of oil flooding systems such as hydrolyzed polyacrylamide, structural polymer A, structural polymer B and gel was studied. The results showed that the viscosity of ordinary polymer and structural polymer B was lower compared with other two types of oil displacement agents, and the viscosity of structural polymer A was higher. The higher the concentration, the higher the viscosity retention rate. The gel system has the highest viscosity and best anti-shear ability. The resistance coefficient and residual resistance coefficient of structural polymer A and gel system were further studied. The results show that permeability, velocity and polymer concentration all affect the resistance coefficient and residual resistance coefficient. From the point of view of resistance establishment ability, it is considered that structural polymer A is not suitable for permeability formation above 10 μm<sup>2</sup>. Gel system has stronger ability to establish resistance coefficient than structural polymer A flooding system, and it is more feasible for formation system with permeability above 10 μm<sup>2</sup>.
基金Science and Technology of Wenzhou City,China(No.Y20100040)
文摘AIM:To compare the visual and optical performance of eyes with different corneal spherical aberration(SA) implanted with spherical aberration-free intraocular lens(IOLs).· METHODS:Thirty-six patients with different corneal SA had phacoemulsification with implantation of spherical aberration-free IOLs.Patients were divided into 3 groups according to the value of preoperative corneal SA.Eyes with corneal SA <0.10μm were assigned to group A,those with 0.10 ≤corneal SA <0.20μm to Group B,and those with 0.20≤corneal SA <0.35μm to Group C.Best-corrected visual acuity(BCVA),contrast sensitivity,corneal SA,total ocular aberrations,and depth of focus were recorded 3 months postoperatively.Distance-corrected near and intermediate visual acuity was studied to measure depth of focus.· RESULTS:BCVA and contrast sensitivity were similar between groups.There were no significant differences in distance-corrected near or intermediate visual acuity.Corneal SA was similar before and 3 months after surgery in the 3 groups.With a 5.0mm pupil diameter,root mean square values for total ocular higher-order aberrations(HOAs) were lower in groups A and B than in group C.Total ocular SA was lower in group A than in groups B and C.SA was also lower in group B than in group C.Coma and trefoil were similar between the groups.· CONCLUSION:Implantation of spherical aberration-free IOLs in eyes with different corneal SA results in similar visual performance at BCVA,contrast sensitivity and depth of focus.
基金supported by a grant from the Shanxi Science and Technology Department of China,No.2011081060a grant from Shanxi Scholarship Council of China,No.2011-44a grant from the Cure Parkinson’s Trust UK to CH
文摘The growth factor glucagon-like peptide-1(GLP-1) is neuroprotective in several animal models of neurodegeneration. Here, we analyzed the neuroprotective effects of a novel protease-resistant GLP-1 analogue,(Val^8)GLP-1-Glu-PAL, which has advantages over older analogues, such as improvement of hippocampal neurogenesis, glucose homeostasis, and insulin secretion. We established an in vitro model of Parkinson's disease using the mitochondrial stressor rotenone in primary cultured mouse neurons pretreated with(Val^8)GLP-1-Glu-PAL.(Val^8)GLP-1-Glu-PAL alone did not affect neuronal viability, but prevented the rotenone-induced reduction in cell viability in a dose-dependent manner. In addition,(Val^8)GLP-1-Glu-PAL pretreatment prevented rotenone-induced proapoptotic changes manifesting as downregulation of procaspase-3 and Bcl-2 and upregulation of cleaved caspase-3. These results demonstrate that the novel agent(Val^8)GLP-1-GluPAL shows promise as a drug treatment for Parkinson's disease.
基金Acknowledgments This study was supported by the National Natural Science Foundation of China （No. 8130 1276） and the Heilongjiang Provincial Department of Education （No. 12541544）. The authors declare that there are no competing interests.
基金supported by grants from National Science and Technology Major Project(2012ZX10004701)
文摘The CD4 binding site(CD4bs) of envelope glycoprotein(Env) is an important conserved target for anti-human immunodeficiency virus type 1(HIV-1) neutralizing antibodies. Neutralizing monoclonal antibodies IgG1 b12(b12) could recognize conformational epitopes that overlap the CD4 bs of Env. Different virus strains, even derived from the same individual, showed distinct neutralization susceptibility to b12. We examined the key amino acid residues affecting b12 neutralization susceptibility using single genome amplification and pseudovirus neutralization assay. Eleven amino acid residues were identified that affect the sensitivity of Env to b12. Through site-directed mutagenesis, an amino acid substitution at position 182 in the V2 region of Env was confirmed to play a key role in regulating the b12 neutralization susceptibility. The introduction of V182 L to a resistant strain enhanced its sensitivity to b12 more than twofold. Correspondingly, the introduction of L182 V to a sensitive strain reduced its sensitivity to b12 more than tenfold. Amino acid substitution at positions 267 and 346 could both enhance the sensitivity to b12 more than twofold. However, no additive effect was observed when the three site mutageneses were introduced into the same strain, and the sensitivity was equivalent to the single V182 L mutation. CRF07_BC is a major circulating recombinant form of HIV-1 prevalent in China. Our data may provide important information for understanding the molecular mechanism regulating the neutralization susceptibility of CRF07_BC viruses to b12 and may be helpful for a vaccine design targeting the CD4 bs epitopes.
基金financially supported by grants from the National Natural Science Foundation of China(No.81673359)Sichuan Major Science and Technology Project on Biotechnology and Medicine(No.2018SZDZX0018)。
文摘Chondroitin sulfate-mediated albumin corona nanoparticles were readily prepared without any chemical reaction,and their active tumor targeting and therapeutic effects were examined.Negatively charged chondroitin sulfate(CS)and positively charged doxorubicin(DOX)self-assembled into nanoparticles(CS-DOX-NPs)via electrostatic interactions.Bovine serum albumin(BSA)was then adsorbed on the surface of CS-DOX-NPs to form albumin corona nanoparticles(BC-DOX-NPs)protected from endogenous proteins.Due to the dual effect of BSA and CS,BC-DOX-NPs interacted with the gp60,SPARC and CD44 receptors on tumor cells,facilitating their rapid and efficient transcytosis and improving their accumulation and uptake within tumor tissues.The simultaneous presence of BSA and CS also allowed BC-DOX-NPs to target CD44 efficiently,leading to greater cellular uptake and cytotoxicity against 4 T1 cells than CS-DOX-NPs or free DOX.Intravenous injection of BCDOX-NPs into orthotopic 4 T1 tumor-bearing mice led to greater drug accumulation at the tumor site than with CS-DOX-NPs or free DOX,resulting in significant inhibition of tumor growth and lower exposure of major organs to the drug.
文摘BACKGROUND The prevalence of type 2 diabetes mellitus(T2DM)is rising rapidly in rural areas,and lifestyle interventions can effectively reduce the blood glucose levels of patients with T2DM.However,current dietary and exercise guidelines are still at experimental stages and are difficult for subjects to understand and implement.The Human Metabolism Analyzer provides real life interventions for the prevention and treatment of T2DM,and our pilot research has demonstrated its effectiveness and good compliance.AIM To investigate the effect of and compliance with lifestyle interventions in rural patients with T2DM.METHODS A total of ten rural villages were randomly selected in Chaoshui Township,Penglai City,Shandong Province,China,to conduct health screening among residents aged 50 years or older.Each rural village represented a group,and 12 patients with T2DM were randomly selected from each group(total:120)to participate in this study and receive real life lifestyle interventions and medication guidance.Lifestyle interventions included changing the meal order(A),postprandial activities(B),resistance exercise(C),and reverse abdominal breathing(D).Diabetes education was conducted at least once a month with a weekly phone follow-up to monitor exercise and diet.Waist circumference,blood pressure,body mass index(BMI),motor function,body composition,fasting blood glucose,and glycated hemoglobin(HbA1c)were analyzed before and 3 mo after the intervention.Moreover,patient compliance and adjustments of hypoglycemic drugs were evaluated.RESULTS A total of 109 subjects completed the study.The compliance rates for lifestyle interventions A,B,C,and D were 57.79%,60.55%,64.22%,and 75.23%,respectively.Among the subjects who received hypoglycemic drugs,the dose was reduced 2 to 3 times based on blood glucose in 54(67.50%)subjects and was tapered and discontinued in 5(6.25%)subjects within 3 mo,with no significant fluctuations in blood glucose after dose reduction and withdrawal.After lifestyle interventions,waist circumference,BMI,fasting blood glucose,and HbA1c significantly decreased(P<0.001);motor function and body composition also significantly improved(P<0.001).CONCLUSION For patients with T2DM,compliance to real-life lifestyle interventions is good,and the interventions significantly improve metabolic indicators such as waist circumference,BMI,blood pressure,HbA1c,body composition,and motor function.Some patients are able to taper or discontinue hypoglycemic drugs.
基金supported by grants from the Shanxi Science and Technology Department in China,No.2011081060Shanxi Scholarship Council of China,No.2011-44
文摘Geniposide, a monomer extracted from gardenia and widely used in Chinese medicine, is a novel agonist at the glucagon-like peptide-1 receptor. This receptor is involved in neuroprotection. In the present study, we sought to identify an anti-apoptotic mechanism for the treatment of neurodegenerative diseases. Primary cultured neurons were treated with different concentrations of rotenone for 48 hours. Morphological observation, cell counting kit-8 assay, lactate dehydrogenase detection and western blot assay demonstrated that 0.5 n M rotenone increased lactate dehydrogenase release, decreased the expression of procaspase-3 and Bcl-2, and increased cleaved caspase-3 expression in normal neurons. All these effects were prevented by geniposide. Our results indicate that geniposide diminished rotenone-induced injury in primary neurons by suppressing apoptosis. This may be one of the molecular mechanisms underlying the efficacy of geniposide in the treatment of neurodegenerative diseases.
基金Supported by the National Natural Science Foundation of China(61421001,61331021,61501029)
文摘By applying smoothed l0norm(SL0)algorithm,a block compressive sensing(BCS)algorithm called BCS-SL0 is proposed,which deploys SL0 and smoothing filter for image reconstruction.Furthermore,BCS-ReSL0 algorithm is developed to use regularized SL0(ReSL0)in a reconstruction process to deal with noisy situations.The study shows that the proposed BCS-SL0 takes less execution time than the classical BCS with smoothed projected Landweber(BCS-SPL)algorithm in low measurement ratio,while achieving comparable reconstruction quality,and improving the blocking artifacts especially.The experiment results also verify that the reconstruction performance of BCS-ReSL0 is better than that of the BCSSPL in terms of noise tolerance at low measurement ratio.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11674198 and 11504206)the Natural Science Foundation of Shandong Province,China(Grant No.ZR2016AP14)the Taishan Scholar Project of Shandong Province,China
文摘The quantum state-to-state calculations of the D + ND→N + D_2 reaction are performed on a potential energy surface of 4 A'' state. The state-resolved integral and differential cross sections and product state distributions are calculated and discussed. It is found that the rotational distribution, rather than the vibrational distribution, of the product has an obvious inversion. Due to the fact that it is a small-impact-parameter collision, its product D_2 is mainly dominated by rebound mechanism, which can lead to backward scattering at low collision energy. As the collision energy increases, the forward scattering and sideward scattering begin to appear. In addition, the backward collision is also found to happen at high collision energy, through which we can know that both the rebound mechanism and stripping mechanism exist at high collision energy.
