The prime function of the Philippine National Collection of Microorganisms (PNCM), being the national repository of microbial strains, is to collect and preserve strains for their continued viability and availability ...The prime function of the Philippine National Collection of Microorganisms (PNCM), being the national repository of microbial strains, is to collect and preserve strains for their continued viability and availability for future use. To date, a total of 2144 strains of bacteria (1357), yeasts (250), filamentous fungi (377), algae (14), and strains still to be identified (146) are maintained at the PNCM. These are preserved and maintained using various methods which include modified liquid drying (lyophilization), ultra-low temperature (-70℃) storage in 10% glycerol, storage in sterile soil, distilled water and overlaying with mineral oil. Periodic viability testing is done to assess the stability of these preserved cultures under storage. Aside from preservation and maintenance of cultures, the PNCM is also involved in several research activities. One of these is the isolation, characterization and identification of some Vibrio isolates from the Philippines. Details on this particular study is presented in this report.展开更多
Background Although severe acute respiratory syndrome （SARS） has been controlled, the subsequently emerging sporadic cases in 2004 emphasize the necessity of developing a rapid diagnostic method, which would be of g...Background Although severe acute respiratory syndrome （SARS） has been controlled, the subsequently emerging sporadic cases in 2004 emphasize the necessity of developing a rapid diagnostic method, which would be of great help in clinical diagosis and also wild host screening. This study aims to establish an effective and rapid serological tool for the diagnosis of SARS-CoV by comparison among whole viral, N and N199 proteins by ELISA. Methods SARS-CoV N and N199 （a truncated nucleocapsid gene） genes were cloned, expressed, identified by Western blotting, and applied in screening of human and swine samples. Sera of SARS convalescent-phase patients, normal human sera, sera of patients with other respiratory diseases, and swine sera were screened by ELISA, with whole SARS-CoV F69, N and N199 proteins as antigens. Results The sensitivity and specificity of N and N199 proteins in human sera diagnosis were approximate （P=-0.743）, which was higher than whole viral protein but the difference was not significant （P=-0.234）. The N199 protein proved to be more specific in swine sera screening than whole viral and N protein （P〈0.001）. Conclusion N199 protein is feasible in both clinical diagnosis and SARS-CoV reservoir screening.展开更多
A new cyclic thiopeptide,berninamycin F(3),three new linear thiopeptides,berninamycins G—I(4-6),and two known berninamycin derivatives,berninamycins C and D(1 and 2)were isolated from Streptomyces sp.CPCC 203702.Thei...A new cyclic thiopeptide,berninamycin F(3),three new linear thiopeptides,berninamycins G—I(4-6),and two known berninamycin derivatives,berninamycins C and D(1 and 2)were isolated from Streptomyces sp.CPCC 203702.Their structures were elucidated through HRESIMS and one-and two-dimensional NMR data,and the absolute configurations were assigned using Marfey's method.Compounds 4-6 are the first examples of linear berninamycin analogs.Notably,compound 4 is the first example of linear thiopeptide with a 1-(oxazol-2-yl)ethan-1-one group,compound 6 is the first linear thiopeptide derivative with methylated oxoacetate moiety.Compounds 1-6 exhibited excellent anti-Zika virus activities with IC_(50) values in the range of 4.4-10.5μmol/L,which were superior to that of the positive control ribavirin(IC_(50)=49.2μmol/L).Compounds 1 and 3 showed strong anti-influenza A virus activities with the IC_(50) values of 15.6 and 3.2μmol/L,respectively.Compound 1 exhibited good antibacterial activities against methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus spp.pathogens.展开更多
文摘The prime function of the Philippine National Collection of Microorganisms (PNCM), being the national repository of microbial strains, is to collect and preserve strains for their continued viability and availability for future use. To date, a total of 2144 strains of bacteria (1357), yeasts (250), filamentous fungi (377), algae (14), and strains still to be identified (146) are maintained at the PNCM. These are preserved and maintained using various methods which include modified liquid drying (lyophilization), ultra-low temperature (-70℃) storage in 10% glycerol, storage in sterile soil, distilled water and overlaying with mineral oil. Periodic viability testing is done to assess the stability of these preserved cultures under storage. Aside from preservation and maintenance of cultures, the PNCM is also involved in several research activities. One of these is the isolation, characterization and identification of some Vibrio isolates from the Philippines. Details on this particular study is presented in this report.
基金This study was supported by a grant from the Science Foundation for SARS of Guangdong Province(No.2003Z3-E0461)
文摘Background Although severe acute respiratory syndrome （SARS） has been controlled, the subsequently emerging sporadic cases in 2004 emphasize the necessity of developing a rapid diagnostic method, which would be of great help in clinical diagosis and also wild host screening. This study aims to establish an effective and rapid serological tool for the diagnosis of SARS-CoV by comparison among whole viral, N and N199 proteins by ELISA. Methods SARS-CoV N and N199 （a truncated nucleocapsid gene） genes were cloned, expressed, identified by Western blotting, and applied in screening of human and swine samples. Sera of SARS convalescent-phase patients, normal human sera, sera of patients with other respiratory diseases, and swine sera were screened by ELISA, with whole SARS-CoV F69, N and N199 proteins as antigens. Results The sensitivity and specificity of N and N199 proteins in human sera diagnosis were approximate （P=-0.743）, which was higher than whole viral protein but the difference was not significant （P=-0.234）. The N199 protein proved to be more specific in swine sera screening than whole viral and N protein （P〈0.001）. Conclusion N199 protein is feasible in both clinical diagnosis and SARS-CoV reservoir screening.
基金This work was financially supported by the National Natural Science Foundation of China(Nos.82073744 and 81402835)CAMS Initiative for Innovative Medicine(Nos.2020-I2M-2-010 and CAMS-I2M-3-014)+1 种基金the National Mega-project for Innovative Drugs(Nos.2019ZX09721001-004-006 and 2018ZX09711001-007-001)the National Microbial Resource Center(No.NMRC-2020-3).
文摘A new cyclic thiopeptide,berninamycin F(3),three new linear thiopeptides,berninamycins G—I(4-6),and two known berninamycin derivatives,berninamycins C and D(1 and 2)were isolated from Streptomyces sp.CPCC 203702.Their structures were elucidated through HRESIMS and one-and two-dimensional NMR data,and the absolute configurations were assigned using Marfey's method.Compounds 4-6 are the first examples of linear berninamycin analogs.Notably,compound 4 is the first example of linear thiopeptide with a 1-(oxazol-2-yl)ethan-1-one group,compound 6 is the first linear thiopeptide derivative with methylated oxoacetate moiety.Compounds 1-6 exhibited excellent anti-Zika virus activities with IC_(50) values in the range of 4.4-10.5μmol/L,which were superior to that of the positive control ribavirin(IC_(50)=49.2μmol/L).Compounds 1 and 3 showed strong anti-influenza A virus activities with the IC_(50) values of 15.6 and 3.2μmol/L,respectively.Compound 1 exhibited good antibacterial activities against methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus spp.pathogens.
