Frequency-vibrancy pest-killing lamp was used to calculate the numbers and types of scarabs during the growing period of sweet potato in Xuzhou area, thus to study the occurrence regularity of scarab and effect of met...Frequency-vibrancy pest-killing lamp was used to calculate the numbers and types of scarabs during the growing period of sweet potato in Xuzhou area, thus to study the occurrence regularity of scarab and effect of meteorological factor on its occurrence, which provided a reference and guidance for the control of grub in sweet potato field. The monitoring results indicated that scarabs in sweet potato planting area of Xuzhou mainly included Anomala corpulenta, Holotrichia parallela Motschulsky, Maladera verticalis and Holotrichia trichophora Fairm. Holotrichia tri- chophora Fairm has entered into its late stage at the early cultivation stage of sweet potato with a few occurrence quantities. The elongation stage of sweet potato vine is the full incidence period of imagoes of Maladera verticalis and Anomala cor- pulenta. Full incidence period of Holotrichia parallela Motschulsky is from late June to middle August, the outbreak cycle of which is long. The unearthed imagoes fol- low the regular change ＂many-few-many-few＂. Effects of meteorological factor on the activities of various scarabs are different. The activities of various scarabs are fre- quent in warm and windless sunny days. In rainy days, Holotrichia parallela Motschulsky, Holotrichia trichophora Fairm and Maladera verticalis are inactive. The numbers of Anomala corpulenta in cloudy days but not rainy days are higher than that in sunny days.展开更多
Pt/Au/WO_3 bimetallic catalysts were prepared by impregnation of Pt onto preformed Au/WO_3,obtained by a hexadecyl trmethyl ammonium bromide（CTAB）-assisted one-pot synthesis method.The resulting Pt/Au/WO_3 catalysts...Pt/Au/WO_3 bimetallic catalysts were prepared by impregnation of Pt onto preformed Au/WO_3,obtained by a hexadecyl trmethyl ammonium bromide（CTAB）-assisted one-pot synthesis method.The resulting Pt/Au/WO_3 catalysts exhibited remarkable synergistic effects for selective hydrogenolysis of glycerol to 1,3-propanediol. The characterization results showed that doping of Au promoted the reduction of both Pt and W at low temperatures and uniform dispersion of Pt on the WO_3 support. Furthermore, more low-valence Pt species were produced on the WO_3 surface after introduction of Au. These changes in electronic properties resulted in enhancement of both glycerol conversion and selectivity for 1,3-propanediol.展开更多
Selective oxidation of glycerol with molecular oxygen in base-free aqueous solutions has become a hot topic,as the rapidly increasing production of biodiesel is creating a surplus of glycerol.In this work,an N-doped-c...Selective oxidation of glycerol with molecular oxygen in base-free aqueous solutions has become a hot topic,as the rapidly increasing production of biodiesel is creating a surplus of glycerol.In this work,an N-doped-carbon-supported core-shell structured Sb@PtSb2 hybrid catalyst was prepared via a facile synthesis route,in which a mixture of glucose,melamine,and SbCl3(Sb-NC)was pyrolyzed,then impregnated with Pt by immersion in an aqueous solution of H2PtCl6,and further treated in hydrogen flow.Characterization of the catalyst products indicated that introducing SbCl3 can increase the surface area of the binary glucose+melamine pyrolyzed support(NC),and Sb@PtSb2 hybrids could be formed on the surface of an Sb-NC support during hydrogen treatment at 700℃.It was found that the Sb@PtSb2/NC catalyst was more active for the selective oxidation of glycerol in a base-free aqueous solution than Sb-free NC-supported Pt(Pt/NC).Further characterization also indicated that the promising performance of Sb@PtSb2/NC might be attributed to its enhanced oxygen activation.展开更多
The platinum-group element geochemistry of rocks and ores from Jinchuan super-large copper-nickel sulfide deposit is systemically studied in this paper. The Cu/Pd mean ratio of Jinchuan intrusion is lower than that of...The platinum-group element geochemistry of rocks and ores from Jinchuan super-large copper-nickel sulfide deposit is systemically studied in this paper. The Cu/Pd mean ratio of Jinchuan intrusion is lower than that of original mantle magma, which indicates that these ultrabasic rocks were crystallized from magma that lost Pd in the form of melting segregation of sulfides. The PGE of the rocks show trend of partial melting, similar to that of mantle peridotite, which shows that magma formation occurs during rock-forming and ore-forming processes. The chondrite normalized PGE patterns of the rocks and ores are well related to each other, which signifies the signatures of multi-episode magmatic intrusion, melting and differentiation in the formation processes of rocks and ores. In addition, analyses about the relation between PGE and S, and study on Re-Os isotopes indicate that few contamination of the crustal substances occurred during the magmatic intrusion and the formation of deposit. However, contamination by crustal substances helps to supply part of the S for the enrichment of PGE. Meanwhile, the hydrothermal process is also advantageous for the enrichment of PGE, especially lbr Pt and Pd, due to deep melting segregation. The characteristic parameters （such as Pt/（Pt＋Pd）, （Pt＋Pd）/（Ru＋Ir＋Os）, Pd/Ir, Cu/（Ni＋Cu）, and so on.） for platinum-group elements for Jinchuan sulfide copper-nickel deposit show the same features as those for sulfide copper-nickel deposit related to basic magma, which also illustrates its original magma property representative of Mg-high tholeiite. Therefore, it is the marie （not ultramafic） magma that resulted in the formation of the superlarge sulfide copper-nickel deposit enriched in Cu and PGE. To sum up, the geochemical characteristics of platinum-group elements in rocks and ores from Jinchuan copper-nickel sulfide deposit are constrained by the continental rift tectonic environment, the parent magma features, the enriched mantel magma source, the complex metallogenesis and PGE geochemical signatures, and this would be rather significant for the study about the genetic mechanism of copper-nickel sulfide deposits.展开更多
AIM: To investigate the role of glutathione S-transferase (GST) and matrix metalloproteinase-9 (MMP-9) expres-sions in the development and progression of reflux es-ophagitis-Barrett’s metaplasia-dysplasia-adenocarcin...AIM: To investigate the role of glutathione S-transferase (GST) and matrix metalloproteinase-9 (MMP-9) expres-sions in the development and progression of reflux es-ophagitis-Barrett’s metaplasia-dysplasia-adenocarcinoma sequence in the esophagus.METHODS: GST and MMP-9 expressions were analyzed in 51 paraffin-embedded tissue samples by immunohisto-chemistry including patients with reflux esophagitis (n = 7), Barrett’s metaplasia (n = 14), Barrett and esophagi-tis (n = 8), Barrett and dysplasia (n = 7), esophageal adenocarcinoma (n = 8) and a control group without any histological changes (n = 7). Immunostaining was determined semiquantitatively. Statistical analysis with one-way ANOVA, LSD test and correlation analysis were performed. P value of < 0.05 was considered significant.RESULTS: GST expression was significantly higher while MMP-9 expression was significantly lower in control group compared to Barrett’s metaplasia and the other groups. No major changes were observed between Bar-rett, esophagitis, and Barrett and concomitant esophagi-tis. Barrett and concomitant dysplasia, and adenocarci-noma revealed a significant lower expression of GST and higher levels of MMP-9 compared to all other groups. Adenocarcinoma showed almost no expression of GST and significantly higher levels of MMP-9 than Barrett and concomitant dysplasia. Alterations of GST and MMP-9 were inversely correlated (r = - 0.82).CONCLUSION: Decreased GST and increased ex-pression of MMP-9 in Barrett’s metaplasia-dysplasia-adenocarcinoma sequence as compared to normal tissue suggest their association with esophageal tumorigenesis. Loss of GST and gain of MMP-9 in Barrett with dyspla-sia compared to non-dysplastic metaplasia indicate that these alterations may be early events in carcinogenesis. Quantification of these parameters in Barrett’s esopha-gus might be useful to identify patients at higher risk for progression to cancer.展开更多
A phytoremediation field trial was established on a site contaminated with Cu, Pb and Zn in the City of Montreal （Canada） using Brassicajuncea, Salix miyabeana and Salix viminalis. The study compared metal content i...A phytoremediation field trial was established on a site contaminated with Cu, Pb and Zn in the City of Montreal （Canada） using Brassicajuncea, Salix miyabeana and Salix viminalis. The study compared metal content in plant tissues of each species at the end of the first growing season and assessed the effects of EDTA as a chelating agent to increase availability of metals for the plants. Brassicajuncea accumulated more metals （Cu, Pb and Zn） in aerial parts than in roots, whereas the willows accumulated Cu and Pb mainly in roots and Zn in aerial parts （mostly in leaves）. EDTA increased metal transfer in Brassica but had no effect on the two willow species. After one growing season, the total biomass yield of Brassica juncea was higher than that of the willows, and consequently, total metal accumulation by the plants was also greater. However, the high yield of willows over several years may make them more successful in brownfield phytoremediation.展开更多
The objective of this study was to examine the effect ofbenzo[a]pyrene （BaP） on the detoxification and antioxidant systems of two microalgae, Isochrysis zhanjiangensis and Platymonas subcordiformis. In our study, th...The objective of this study was to examine the effect ofbenzo[a]pyrene （BaP） on the detoxification and antioxidant systems of two microalgae, Isochrysis zhanjiangensis and Platymonas subcordiformis. In our study, these two algae were exposed to BaP for 4 days at three different concentrations including 0.5 μg L-1 （low）, 3 μg L-1 （mid） and 18 μg L-1 （high）. The activity of detoxi- fication enzymes, ethoxyresorufin O-deethylase （EROD） and glutathione S-transferase （GST） increased in P subcordiformis in all BaP-treated groups. In 1. zhanjiangensis, the activity of these two enzymes increased at the beginning of exposure, and then de- creased in the groups treated with mid- and high BaP. The activity of antioxidant enzyme superoxide dismutase （SOD） increased in/. zhanjiangensis in all BaP-treated groups, and then decreased in high BaP-treated group, while no significant change was observed in P subcordiformis. The activity of antioxidant enzyme catalase （CAT） increased in I. zhanjiangensis and P subcordiformis in all BaP- treated groups. The content of malondialdehyde （MDA） in Isochrysis zhanjiangensis increased first, and then decreased in high BaP-treated group, while no change occurred in P. subcordiformis. These results demonstrated that BaP significantly influenced the activity of detoxifying and antioxidant enzymes in microalgae. The metabolic related enzymes （EROD, GST and CAT） may serve as sensitive biomarkers of measuring the contamination level of BaP in marine water.展开更多
How to best use farmland contaminated with low to moderate levels of heavy metals remains a challenge in many parts of the world. Here, we screened sugar cane varieties to identify those with a low ability to accumula...How to best use farmland contaminated with low to moderate levels of heavy metals remains a challenge in many parts of the world. Here, we screened sugar cane varieties to identify those with a low ability to accumulate heavy metals and with high tolerance. These trials were conducted in arsenic （As）, lead （Pb） and Cadmium （Cd） contaminated farmland in Huanjiang County, Guangxi Zhuang Autonomous Region, China. We tested seven varieties and found that cultivar Guiyin9 had the highest cane stem yield （187.5t ha-1 ） and sugar content （27t ha-1 ）. The concentrations of As, Pb and Cd in the cane juice of Guiyin9 were all below the maximum limit for contaminants in food. Because Guiyin9 showed low accumulation of the heavy metals tested here and produced a high cane stem yield, this cultivar could be planted as a valuable crop in large areas of southern China contaminated with low to moderate levels of heavy metals.展开更多
Objective：To investigate antimicrobial potential of aqueous（infusions,decoctions） and methanlic extracts（1：2 and 1：5 concentrations） of Emblica officinalis（amla） against seven pathogenic bacteria namely Staph...Objective：To investigate antimicrobial potential of aqueous（infusions,decoctions） and methanlic extracts（1：2 and 1：5 concentrations） of Emblica officinalis（amla） against seven pathogenic bacteria namely Staphylococcs aureus,Staphylococcus saprophyticus,Escherichia coli,Enterococcus faecalis,Enterococcus cloacae,Proteus vulgaris and Klebsiella pneumoniae.Methods：The well diffusion technique was employed.The minimum inhibitory concentration（MIC） was determined using micro-broth dilution methods and phytochemical screening was done as per standard procedures.Results：Aqueous infusion extract of amla exhibited potent antimicrobial activity against E.cloacae followed by E.coli.Preliminary phytochemical analysis of E.officinalis aqueous extracts（infusions and decoctions） only showed presence of tannins,saponins,flavanoids,Terpenoids and phenols.MIC of aqueous extract of E.officinalis was most active against K.pneumoniae.Whereas MIC of methanol extract of E.officinalis shows maximum activity against E.coli.Conclusion：Emblica officinalis definitely possesses potent antimicrobial activities and this can serve as an important platform for the development of inexpensive,safe and effective medicines展开更多
A transgenic maize event ZD12-6 expressing a Bacillus thuringiensis （Bt） fusion protein CrylAb/Cry2Aj and a modified 5-enolpyruvylshikimate-3-phosphate synthase （EPSPS） protein G10 was characterized and evaluated....A transgenic maize event ZD12-6 expressing a Bacillus thuringiensis （Bt） fusion protein CrylAb/Cry2Aj and a modified 5-enolpyruvylshikimate-3-phosphate synthase （EPSPS） protein G10 was characterized and evaluated. Southern blot analysis indicated that ZD12-6 is a single copy integration event. The insert site was determined to be at chromosome 1 by border sequence analysis. Expression analyses of Bt fusion protein CrylAb/Cry2Aj and the EPSPS protein G10 suggested that they are both expressed stably in different generations. Insect bioassays demonstrated that the transgenic plants are highly resistant to Asian corn borer （Ostnnia furnacalis）, cotton boll worm （Helicoverpa armigera）, and armyworm （Mythimna separata）. This study suggested that ZD12-6 has the potential to be developed into a commercial transgenic line.展开更多
Polydichlorophosphazene(PDCP)was synthesized from PCl5 and NH4Cl via a one-pot approach,and then further reacted with glycine ethyl ester and methylparaben via a two-step nucleophilic substitution approach to give pol...Polydichlorophosphazene(PDCP)was synthesized from PCl5 and NH4Cl via a one-pot approach,and then further reacted with glycine ethyl ester and methylparaben via a two-step nucleophilic substitution approach to give poly(methylparaben/glycine ethyl ester)phosphazene(PMGP),which was a kind of mix-substituted biodegradable polymer.NMR and FT-IR were used to characterize its structure.A series of experiments were conducted to study the effects of the ratio of methylparaben to glycine ethyl ester and the experimental conditions to the degradability of PMGP samples.The degradability of PMGP can be adjusted by altering the ratio of methylparaben to glycine ethyl ester easily.展开更多
基金Supported by National 863 Program(2012AA101204))Project for the Construction of Modern Agricultural Industry Technology System(CARS-11)Science and Technology Support Program in Jiangsu(BE2012336 and BE2013437)~~
文摘Frequency-vibrancy pest-killing lamp was used to calculate the numbers and types of scarabs during the growing period of sweet potato in Xuzhou area, thus to study the occurrence regularity of scarab and effect of meteorological factor on its occurrence, which provided a reference and guidance for the control of grub in sweet potato field. The monitoring results indicated that scarabs in sweet potato planting area of Xuzhou mainly included Anomala corpulenta, Holotrichia parallela Motschulsky, Maladera verticalis and Holotrichia trichophora Fairm. Holotrichia tri- chophora Fairm has entered into its late stage at the early cultivation stage of sweet potato with a few occurrence quantities. The elongation stage of sweet potato vine is the full incidence period of imagoes of Maladera verticalis and Anomala cor- pulenta. Full incidence period of Holotrichia parallela Motschulsky is from late June to middle August, the outbreak cycle of which is long. The unearthed imagoes fol- low the regular change ＂many-few-many-few＂. Effects of meteorological factor on the activities of various scarabs are different. The activities of various scarabs are fre- quent in warm and windless sunny days. In rainy days, Holotrichia parallela Motschulsky, Holotrichia trichophora Fairm and Maladera verticalis are inactive. The numbers of Anomala corpulenta in cloudy days but not rainy days are higher than that in sunny days.
基金supported by the National Natural Science Foundation of China(21690080,21690084,21721004,21673228)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB17020100)the National Key Projects for Fundamental Research and Development of China(2016YFA0202801)~~
文摘Pt/Au/WO_3 bimetallic catalysts were prepared by impregnation of Pt onto preformed Au/WO_3,obtained by a hexadecyl trmethyl ammonium bromide（CTAB）-assisted one-pot synthesis method.The resulting Pt/Au/WO_3 catalysts exhibited remarkable synergistic effects for selective hydrogenolysis of glycerol to 1,3-propanediol. The characterization results showed that doping of Au promoted the reduction of both Pt and W at low temperatures and uniform dispersion of Pt on the WO_3 support. Furthermore, more low-valence Pt species were produced on the WO_3 surface after introduction of Au. These changes in electronic properties resulted in enhancement of both glycerol conversion and selectivity for 1,3-propanediol.
基金financially supported by the National Natural Science Foundation of China(21773206 and 21473155)Natural Science Foundation of Zhejiang Province(L12B03001)~~
文摘Selective oxidation of glycerol with molecular oxygen in base-free aqueous solutions has become a hot topic,as the rapidly increasing production of biodiesel is creating a surplus of glycerol.In this work,an N-doped-carbon-supported core-shell structured Sb@PtSb2 hybrid catalyst was prepared via a facile synthesis route,in which a mixture of glucose,melamine,and SbCl3(Sb-NC)was pyrolyzed,then impregnated with Pt by immersion in an aqueous solution of H2PtCl6,and further treated in hydrogen flow.Characterization of the catalyst products indicated that introducing SbCl3 can increase the surface area of the binary glucose+melamine pyrolyzed support(NC),and Sb@PtSb2 hybrids could be formed on the surface of an Sb-NC support during hydrogen treatment at 700℃.It was found that the Sb@PtSb2/NC catalyst was more active for the selective oxidation of glycerol in a base-free aqueous solution than Sb-free NC-supported Pt(Pt/NC).Further characterization also indicated that the promising performance of Sb@PtSb2/NC might be attributed to its enhanced oxygen activation.
文摘The platinum-group element geochemistry of rocks and ores from Jinchuan super-large copper-nickel sulfide deposit is systemically studied in this paper. The Cu/Pd mean ratio of Jinchuan intrusion is lower than that of original mantle magma, which indicates that these ultrabasic rocks were crystallized from magma that lost Pd in the form of melting segregation of sulfides. The PGE of the rocks show trend of partial melting, similar to that of mantle peridotite, which shows that magma formation occurs during rock-forming and ore-forming processes. The chondrite normalized PGE patterns of the rocks and ores are well related to each other, which signifies the signatures of multi-episode magmatic intrusion, melting and differentiation in the formation processes of rocks and ores. In addition, analyses about the relation between PGE and S, and study on Re-Os isotopes indicate that few contamination of the crustal substances occurred during the magmatic intrusion and the formation of deposit. However, contamination by crustal substances helps to supply part of the S for the enrichment of PGE. Meanwhile, the hydrothermal process is also advantageous for the enrichment of PGE, especially lbr Pt and Pd, due to deep melting segregation. The characteristic parameters （such as Pt/（Pt＋Pd）, （Pt＋Pd）/（Ru＋Ir＋Os）, Pd/Ir, Cu/（Ni＋Cu）, and so on.） for platinum-group elements for Jinchuan sulfide copper-nickel deposit show the same features as those for sulfide copper-nickel deposit related to basic magma, which also illustrates its original magma property representative of Mg-high tholeiite. Therefore, it is the marie （not ultramafic） magma that resulted in the formation of the superlarge sulfide copper-nickel deposit enriched in Cu and PGE. To sum up, the geochemical characteristics of platinum-group elements in rocks and ores from Jinchuan copper-nickel sulfide deposit are constrained by the continental rift tectonic environment, the parent magma features, the enriched mantel magma source, the complex metallogenesis and PGE geochemical signatures, and this would be rather significant for the study about the genetic mechanism of copper-nickel sulfide deposits.
文摘AIM: To investigate the role of glutathione S-transferase (GST) and matrix metalloproteinase-9 (MMP-9) expres-sions in the development and progression of reflux es-ophagitis-Barrett’s metaplasia-dysplasia-adenocarcinoma sequence in the esophagus.METHODS: GST and MMP-9 expressions were analyzed in 51 paraffin-embedded tissue samples by immunohisto-chemistry including patients with reflux esophagitis (n = 7), Barrett’s metaplasia (n = 14), Barrett and esophagi-tis (n = 8), Barrett and dysplasia (n = 7), esophageal adenocarcinoma (n = 8) and a control group without any histological changes (n = 7). Immunostaining was determined semiquantitatively. Statistical analysis with one-way ANOVA, LSD test and correlation analysis were performed. P value of < 0.05 was considered significant.RESULTS: GST expression was significantly higher while MMP-9 expression was significantly lower in control group compared to Barrett’s metaplasia and the other groups. No major changes were observed between Bar-rett, esophagitis, and Barrett and concomitant esophagi-tis. Barrett and concomitant dysplasia, and adenocarci-noma revealed a significant lower expression of GST and higher levels of MMP-9 compared to all other groups. Adenocarcinoma showed almost no expression of GST and significantly higher levels of MMP-9 than Barrett and concomitant dysplasia. Alterations of GST and MMP-9 were inversely correlated (r = - 0.82).CONCLUSION: Decreased GST and increased ex-pression of MMP-9 in Barrett’s metaplasia-dysplasia-adenocarcinoma sequence as compared to normal tissue suggest their association with esophageal tumorigenesis. Loss of GST and gain of MMP-9 in Barrett with dyspla-sia compared to non-dysplastic metaplasia indicate that these alterations may be early events in carcinogenesis. Quantification of these parameters in Barrett’s esopha-gus might be useful to identify patients at higher risk for progression to cancer.
文摘A phytoremediation field trial was established on a site contaminated with Cu, Pb and Zn in the City of Montreal （Canada） using Brassicajuncea, Salix miyabeana and Salix viminalis. The study compared metal content in plant tissues of each species at the end of the first growing season and assessed the effects of EDTA as a chelating agent to increase availability of metals for the plants. Brassicajuncea accumulated more metals （Cu, Pb and Zn） in aerial parts than in roots, whereas the willows accumulated Cu and Pb mainly in roots and Zn in aerial parts （mostly in leaves）. EDTA increased metal transfer in Brassica but had no effect on the two willow species. After one growing season, the total biomass yield of Brassica juncea was higher than that of the willows, and consequently, total metal accumulation by the plants was also greater. However, the high yield of willows over several years may make them more successful in brownfield phytoremediation.
基金supported by the State Oceanic Administration Specific Public Project of China (201105013)
文摘The objective of this study was to examine the effect ofbenzo[a]pyrene （BaP） on the detoxification and antioxidant systems of two microalgae, Isochrysis zhanjiangensis and Platymonas subcordiformis. In our study, these two algae were exposed to BaP for 4 days at three different concentrations including 0.5 μg L-1 （low）, 3 μg L-1 （mid） and 18 μg L-1 （high）. The activity of detoxi- fication enzymes, ethoxyresorufin O-deethylase （EROD） and glutathione S-transferase （GST） increased in P subcordiformis in all BaP-treated groups. In 1. zhanjiangensis, the activity of these two enzymes increased at the beginning of exposure, and then de- creased in the groups treated with mid- and high BaP. The activity of antioxidant enzyme superoxide dismutase （SOD） increased in/. zhanjiangensis in all BaP-treated groups, and then decreased in high BaP-treated group, while no significant change was observed in P subcordiformis. The activity of antioxidant enzyme catalase （CAT） increased in I. zhanjiangensis and P subcordiformis in all BaP- treated groups. The content of malondialdehyde （MDA） in Isochrysis zhanjiangensis increased first, and then decreased in high BaP-treated group, while no change occurred in P. subcordiformis. These results demonstrated that BaP significantly influenced the activity of detoxifying and antioxidant enzymes in microalgae. The metabolic related enzymes （EROD, GST and CAT） may serve as sensitive biomarkers of measuring the contamination level of BaP in marine water.
基金the National Natural Science Foundation of China (Grant No. 41071215)the National High Technology Research and Development Program of China (Grant No. 2012AA06A202)
文摘How to best use farmland contaminated with low to moderate levels of heavy metals remains a challenge in many parts of the world. Here, we screened sugar cane varieties to identify those with a low ability to accumulate heavy metals and with high tolerance. These trials were conducted in arsenic （As）, lead （Pb） and Cadmium （Cd） contaminated farmland in Huanjiang County, Guangxi Zhuang Autonomous Region, China. We tested seven varieties and found that cultivar Guiyin9 had the highest cane stem yield （187.5t ha-1 ） and sugar content （27t ha-1 ）. The concentrations of As, Pb and Cd in the cane juice of Guiyin9 were all below the maximum limit for contaminants in food. Because Guiyin9 showed low accumulation of the heavy metals tested here and produced a high cane stem yield, this cultivar could be planted as a valuable crop in large areas of southern China contaminated with low to moderate levels of heavy metals.
文摘Objective：To investigate antimicrobial potential of aqueous（infusions,decoctions） and methanlic extracts（1：2 and 1：5 concentrations） of Emblica officinalis（amla） against seven pathogenic bacteria namely Staphylococcs aureus,Staphylococcus saprophyticus,Escherichia coli,Enterococcus faecalis,Enterococcus cloacae,Proteus vulgaris and Klebsiella pneumoniae.Methods：The well diffusion technique was employed.The minimum inhibitory concentration（MIC） was determined using micro-broth dilution methods and phytochemical screening was done as per standard procedures.Results：Aqueous infusion extract of amla exhibited potent antimicrobial activity against E.cloacae followed by E.coli.Preliminary phytochemical analysis of E.officinalis aqueous extracts（infusions and decoctions） only showed presence of tannins,saponins,flavanoids,Terpenoids and phenols.MIC of aqueous extract of E.officinalis was most active against K.pneumoniae.Whereas MIC of methanol extract of E.officinalis shows maximum activity against E.coli.Conclusion：Emblica officinalis definitely possesses potent antimicrobial activities and this can serve as an important platform for the development of inexpensive,safe and effective medicines
基金Project supported by the Fundamental Research Funds for the Central Universities(No.2017FZA6011)the National Key Transgenic Research Projects(No.2016ZX08010003)of China
文摘A transgenic maize event ZD12-6 expressing a Bacillus thuringiensis （Bt） fusion protein CrylAb/Cry2Aj and a modified 5-enolpyruvylshikimate-3-phosphate synthase （EPSPS） protein G10 was characterized and evaluated. Southern blot analysis indicated that ZD12-6 is a single copy integration event. The insert site was determined to be at chromosome 1 by border sequence analysis. Expression analyses of Bt fusion protein CrylAb/Cry2Aj and the EPSPS protein G10 suggested that they are both expressed stably in different generations. Insect bioassays demonstrated that the transgenic plants are highly resistant to Asian corn borer （Ostnnia furnacalis）, cotton boll worm （Helicoverpa armigera）, and armyworm （Mythimna separata）. This study suggested that ZD12-6 has the potential to be developed into a commercial transgenic line.
文摘Polydichlorophosphazene(PDCP)was synthesized from PCl5 and NH4Cl via a one-pot approach,and then further reacted with glycine ethyl ester and methylparaben via a two-step nucleophilic substitution approach to give poly(methylparaben/glycine ethyl ester)phosphazene(PMGP),which was a kind of mix-substituted biodegradable polymer.NMR and FT-IR were used to characterize its structure.A series of experiments were conducted to study the effects of the ratio of methylparaben to glycine ethyl ester and the experimental conditions to the degradability of PMGP samples.The degradability of PMGP can be adjusted by altering the ratio of methylparaben to glycine ethyl ester easily.
