检索结果-南通市图书馆

Science China Chemistry 1996年第2期39卷 192-202页

作者：程鹏廖代正阎世平姜宗慧王耕霖王磊光劳学军姚心侃王宏根王国雄 Department of Chemistry Nankai University Tianjin 300071 China State Key Laboratory of Coordination Chemistry Nanjing University Nanjing 210097 China Department of Physics Nankai University Tianjin 300071 China Central Laboratory Nankai University Tianjin 300071 China Department of Chemistry Nanjing University Nanjing 210097 China

Four enol-form binuclear copper complexes with different exogenous bridges, [Cu2(L)(μ-Cl)] (1), [Cu(L)(μ-N3)]· DMF (2), [Cu2(L)(μ-OCH3)] (3) and [Cu2(L)(μ-C3H3N2)]· 1/2C2H5OH (4), where L is the trivalence anion of binucleating ligand 2,6-diformyl-4-methylphenol di(tenzoylhydrazone), have been synthesized and characterized. Crystal data for complex (3) are as follows: space group P1- , a=0.8294(1), 6=0.9333(3), c= 1.473 6(6) nm, α=79.51(3)°, β=80.93(2)°,γ=81.32(2)°, Z=1. The magnetic measurements indicated that the effect of exogenous bridging ligands on magnetic interaction is corresponding to that in spectrochemical series. The effect of enol- and keto-form tautomer on magnetic interaction was explained from the point of view of structural factors and electron effects by using molecular mechanks and quantum chemistry calculations.

关键词： binuclear copper(II) complexes exogenous bridge tautomer isomerization magnetic interaction molecular mechanics.

Possible role of extracellular vesicles in exogenous chemical exposure-associated health concern

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第6期31卷 1-4页

作者： Guangbo Qu Xingchen Zhao Yanna Liu Fang Hao Jie Gao Lili Yang Qunfang Zhou Guibin Jiang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences Institute of Environment and Health Jianghan University

Extracellular vesicles(EVs) are mediators of intercellular message communication by transferring lipids, proteins, genetic materials, and are therefore involved in a wide spectrum of physiological or pathological processes. exogenous chemicals exposure may affect the function of EVs at the biogenesis, secretion, transport or reception stage, which could further result in abnormal information communication between cells, and thus induce toxicity and diseases. This review briefly explores the role of EVs in chemical exposure-associated health concern and progressive diseases.

关键词： EV Possible role of extracellular vesicles in exogenous chemical exposure-associated health concern

The effects of calcium combined with chitosan amendment on the bioavailability of exogenous Pb in calcareous soil

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2020年第5期19卷 1375-1386页

作者： CHANG Hui-qing WANG Qi-zhen LI Zhao-jun WU Jie XU Xiao-feng SHI Zhao-yong Henan University of Science and Technology Luoyang 471000P.R.China Key Laboratory of Plant Nutrition and Fertilizer Ministry of Agriculture and Rural Affairs/China-New Zealand Joint Laboratory for Soil Molecular EcologyInstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081P.R.China

Lead(Pb) in soil may accumulate in crops and enter the human body. This study aimed to understand the speciation transformation and accumulation characteristics of exogenous Pb in calcareous soil with or without the application of soil amendments. Field experiments with continuous maize cultivation have been carried out for two years. The results showed that the contents of total Pb were slightly lower in 2016 than in 2015 for the same treatments;however, no significant difference between the years was observed. Soil Pb existed mainly in the residual fraction without exogenous Pb addition, and its proportion was more than 33% of the total soil Pb in the control and Ca treatments. When Pb was added to calcareous soil, Pb existed largely in the oxidizable and reducible fractions during the two-year experimental period, and those fractions made up over 83% of the total Pb. The proportion of the water-soluble Pb, regardless of the addition of Pb, was the lowest and was less than 0.0019% in all treatments, but the addition of Ca and chitosan amendments reduced the water-soluble and exchangeable Pb contents. The Pb content in different parts of maize followed the order root>leaf>stem>grain during the experimental period. Although maize had low transfer and enrichment factors in calcareous soil, which make the Pb content in the grain show no significant difference among the five treatments in the same year, adding Ca and chitosan to calcareous soil can reduce the Pb contents of maize, especially reduce the Pb contents of root, stem and leaf. Therefore, the addition of calcium and chitosan is an effective strategy for reducing Pb availability in calcareous soils.

关键词： exogenous Pb maize calcareous soil speciation transformation amendments

Glyco-poly-L-lysine is better than liposomal delivery of exogenous genes to rat liver

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2000年第4期6卷 526-531页

作者： Yang, CQ Wang, JY He, BM Liu, JJ Guo, JS Shanghai Med Univ Zhongshan Hosp Div Gastroenterol Shanghai 200032 Peoples R China

AIM To compare the effects of liposomes andglyco-poly-L-lysine on liver targeted uptake andexpression of plasmid in rat *** After binding with lipofectamine orgalactose-terminal glyco-poly-L-lysine,theplasmid could be expressed in eukaryotic cellswhen injected into Wistar rats by *** different time intervals after the injection,the distribution and expression of the plasmid inliver of rats were observed and compared using insitu hybridization and *** The expression of the plasmid bindingto liposomes or G-PLL could be markedly observed24 h later,and began to decrease one week later,but it still could be observed up to three *** liposomes and G-PLL could deliver theplasmid to the liver effectively,but the effect of thelatter was better than the former concerning thedistribution and expression of the plasmid targeteduptake in the *** G-PLL is better than liposome asthe targeted carrier for delivering exogenous genesto the liver.

关键词： liposomes glyco-poly-L-lysine targeted liver uptake exogenous gene

Arbuscular mycorrhizal fungi combined with exogenous calcium improves the growth of peanut(Arachis hypogaea L.)seedlings under continuous cropping

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2019年第2期18卷 407-416页

作者： CUI Li GUO Feng ZHANG Jia-lei YANG Sha MENG Jing-jing GENG Yun WANG Quan LI Xin-guo WAN Shu-bo Biotechnology Research Center Shandong Academy of Agricultural Sciences/Key Laboratory of Crop Genetic Improvement and Ecological Physiology of Shandong ProvinceJinan 250100P.R.China Scientific Observing and Experimental Station of Crop Cultivatio n in East China Ministry of AgricultureJinan 250100P.R.China College of Life Sciences Shandong Normal UniversityJinan 250014P.R.China Shandong Academy of Agricultural Sciences Jinan 250100P.R.China

The growth and yield of peanut are negatively affected by continuous *** mycorrhizal fungi(AMF)and calcium ions(Ca^(2+))have been used to improve stress resistance in other plants,but little is known about their roles in peanut seedling growth under continuous *** study investigated the possible roles of the AMF Glomus mosseae combined with exogenous Ca^(2+)in improving the physiological responses of peanut seedlings under continuous *** combined with exogenous Ca^(2+)can enhance plant biomass,Ca^(2+)level,and total chlorophyll *** exogenous Ca^(2+)application,the F_v/F_m in arbuscular mycorrhizal(AM)plant leaves was higher than that in the control plants when they were exposed to high irradiance *** peroxidase,superoxide dismutase,and catalase activities in AM plant leaves also reached their maximums,and accordingly,the malondialdehyde content was the lowest compared to other ***,root activity,and content of total phenolics and flavonoids were significantly increased in AM plant roots treated by Ca^(2+)compared to either *** inoculation or Ca^(2+)treatment *** levels of AhCaM,AhCDPK,AhRAM1,and AhRAM2 were significantly improved in AM plant roots under exogenous Ca^(2+)*** implied that exogenous Ca^(2+)might be involved in the regulation of *** colonization of peanut plants,and in turn,AM symbiosis might activate the Ca^(2+)signal transduction *** combination of AMF and Ca^(2+)benefitted plant growth and development under continuous cropping,suggesting that it is a promising method to cope with the stress caused by continuous cropping.

关键词： Arachis hypogaea L. arbuscular mycorrhizal fungi continuous cropping exogenous calcium

Introduction of exogenous wild soybean DNA into cultivated soybean and RAPD molecular verification

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 1995年第10期38卷 1195-1201页

作者：谢纬武王斌雷勃钧李希臣卢翠华钱华周思君 Institute of Genetics Chinese Academy of SciencesBeijing 100101China Biotechnology Research Center Heilongjiang Academy of Agricultural SciencesHarbin 150086China

The exogenous total DNA of the wild high-protein soybean was transferred to cultivated soybean through the pollen tube channel and the genomic variation of the transformed progeny was detected by the method of RAPD(Random Amplified Polymorphic DNA). Distinguished variations were found in one of the 7 transformed plants of the first generation(D_1),of which the traits of fruition,outward appearance,leaf shape and flower colour were almost identical with those of the recipient parent;of which grain weight,seed coat colour and stem strength were situated between the two parents;and there were greatly more pods per plant and 12.5% higher content of protein in seeds than that of the recipient *** the properties have been invariably inherited for 3 generations. Through RAPD analysis of the genomes of the donor,the recipient and the transformed progeny(D_3)as a group,DNA polyrnorphisms were found in amplified products by 24 of 150 *** results prove that the exogenous DNA caused the distinct variance of the *** authors infer that the homogeneous recombination of large exogenous DNA is the main cause for the variance.

关键词： soybean pollen tube channel introduction of exogenous DNA RAPD

RAPID DETECTION OF exogenous HUMAN CLOTTING FACTOR IX cDNA IN TRANSFERRED CELLS BY POLYMERASE CHAIN REACTION

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1990年第23期35卷 1995-1999页

作者：周洁民戴一凡邱信芳薛京伦 Institute of Genetics Fudan University Shanghai 200433 PRC

Polymerase chain reaction (PCR) is a recently devoloped molecular biological technique, using specific oligonucleotide primers and DNA polymerase to amplify the specific fragment of DNA in vitro. This technique has been successfully introduced in gene diagnosis, mutation detection, polymorphism analysis and nucleotide sequencing. In the study of gene transfer and gene therapy, it is necessary to analyse DNA in the

关键词： polymerase chain reaction human clotting factor Ⅸ cDNA exogenous cDNA detection.

Experimental study on relationship between exogenous estrogen and breast cancer risk

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 1997年第5期 68-71页

作者：曾希志姚榛祥

Objective To investigate the relationship between exogenous estrogen and breast cancer risk. Methods Female rats were randomly divided into three groups, namely diethylstilbestrol (DES), norethindrone compositae (CoNET) and control group. The histological structure and ultrastructural changes of mammae were observed. The levels of sexual hormones in serum were determined and the AgNOR counts, DNA contents and steroid receptor contents in mammary epithelium were also detected. Results In DES group, the level of progesterone (10.38 ng/ml) was obviously lower than that in the control group (13.37 ng/ml); the incidence of hyperplasia of mammary gland (73.33%) was significantly higher than that in the control group (7.69%); and the degree of hyperplasia was obviously more serious than that in the control group. Moreover, there were 13.33% of rats with atypical hyperplasia in DES group. The DNA contents, AgNOR counts and estrogen receptor (ER) positive rate were markedly higher in DES group (95.60, 2.43 and 71.71% respectively) than in the control group (83.07, 1.88 and 40% respectively). However, in CoNET group, there were no obvious influences on ER, AgNOR and DNA in mammary epithelium. Conclusions exogenous estrogen (DES) could affect the levels of sexual hormones in serum, accelerate the DNA duplication, increase the AgNOR counts and ER contents, and induce atypical hyperplasia and ultrastructural changes of mammary gland, hence becoming a latent risk factor of breast cancer. However, the results failed to suggest that the contraceptive, CoNET, could increase the risk of breast cancer.

关键词： estrogen exogenous

exogenous Financing,State-Ownership Features and Enterprises Productivity-An Empirical Analysis on Listed Chinese Manufacturing Enterprises

在线全文

学校读者我要写书评

暂无评论

Chinese Business Review 2018年第9期17卷 431-441页

作者： Xiangqi Zhou Jiawen Qi Haiyue Liu Sichuan University ChengduChina

This study examines how the exogenous financing and state-ownership features affect the enterprises’productivity by observing the financing data of 1,481 Chinese listed enterprises over the period *** result shows that long-term loan has a positive impact on enterprises’***-term loan and account payable have a negative impact on enterprises’***,we find that state-ownership features have a negative impact on enterprises ***,this paper investigates the relationship between enterprises’productivity and the degree of regional economic development measured by GDP on provincial *** result shows provincial economic development is positively related to the enterprises *** findings are useful for both related authorities and enterprises for better understanding of the financial channels and constrains in China and the possible solutions to more diversified exogenous financing.

关键词： exogenous financing state-ownership features enterprises productivity

exogenous Protein as an Environmental Stimulus of Biofilm Formation in Select Bacterial Strains

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Microbiology 2020年第3期10卷 123-144页

作者： Donna Ye Lekha Bapu Mariane Mota Cavalcante Jesse Kato Maggie Lauria Sneideman Kim Scribner Thomas Loch Terence L. Marsh Department of Microbiology and Molecular Genetics Michigan State University East Lansing MI USA Department of Biology Universidade Federal de São Carlos Sorocaba SP Brazil Department of Biology Kalamazoo College Kalamazoo MI USA Department of Fisheries and Wildlife Michigan State University East Lansing MI USA

A screening of environmental conditions that would elicit robust biofilm in a collection of Serratia marcescens isolated from soil revealed that exogenous milk protein increased biofilm productivity up to ten-fold. A select screening of fish pathogens, freshwater and human isolates identified several other species that responded similarly to exogenous protein. The optimal protein concentration was species specific;S. marcescens at 5% milk protein, Aeromonas sp. at 2% - 3%, Flavobacterium columnare at 1% and Pseudomonas aeruginosa at 0.1% - 0.4%. Media supplemented with milk protein also increased the cell counts in biofilm as well as the protein incorporated into the biofilm matrix. These data suggest that relatively high concentrations of exogenous protein may serve as an environmental trigger for biofilm formation, particularly for pathogenic bacteria exposed to relatively high concentrations of protein in bodily fluids and mucosal surfaces.

关键词： Biofilm Environmental Stimulus exogenous Protein Serratia marcescens Aeromonas sp. Flavobacterium columnare