检索结果-南通市图书馆

Effects of Soil Properties on Phosphorus Subsurface Migration in Sandy Soils

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2008年第5期18卷 599-610页

作者： ZHANG Ming-Kui College of Natural Resource and Environmental Sciences Zhejiang University Huajiachi Campus Hangzhou 310029（China）.

The soil factors influencing the potential migration of dissolved and particulate phosphorus(P) from structurally-weak sandy subsoils were evaluated by means of soil column leaching experiments. Soil colloids were extracted from two types of soils to make the colloid-bound forms of P solution. Eight sandy soils with diverse properties were collected for packing soil columns. The effects of influent solutions varying in concentrations of colloids,P,and electrolyte,on the transport of P and quality of leachates were characterized. P migration in the soils was soil property-dependent. High soil electrical conductivity values retarded the mobility of colloids and transportability of colloid-associated P(particulate P) . Soil electrical conductivity was negatively correlated with colloids and reactive particulate P(RPP) concentrations in the leachates,whereas,the total reactive P(TRP) and dissolved reactive P(DRP) concentrations in the leachates were mainly controlled by the P adsorption capacity and the P levels in the subsoil. The reactive particulate P in the leachates was positively correlated with the colloidal concentration. Increased colloidal concentration in the influent could significantly increase the colloidal concentration in the leachates. Elevated P concentration in the influent had little effect on P recovery in the leachates,but it resulted in significant increases in the absolute P concentration in the leachates.

关键词： colloidal type electrical conductivity P adsorption capacity P subsoil migration sandy soil

Construction of a host range-expanded hybrid baculovirus of BmNPV and AcNPV, and knockout of cysteinase gene for more efficient expression

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2004年第5期47卷 406-415页

作者： WU Xiaofeng, CAO Cuiping, XU Yaxiang & LU Xingmeng College of Animal Sciences, Zhejiang University, huajiachi campus, Hangzhou 310029, China 1. College of Animal Sciences Zhejiang University Huajiachi Campus 310029 Hangzhou China

AcNPV (Autographa californica nuclear polyhedrosis virus) and BmNPV(Bombyx mori nuclear polyhedrosis virus) are two principal insect-baculovirus expression systems, each having different characteristics. AcNPV has a wider host range and can infect a series of cell lines thus making it suitable for cell suspension culture expression, but the small size of the host insect, A. californica, makes AcNPV less suitable for large scale protein synthesis. In contrast, BmNPV can only infect the silkworm, Bombyx mori, which is well-known for its easy rearing and large size. These characteristics make the BmNPV system especially suitable for large-scale industrial ex-pression. To utilize the advantages of both AcNPV and BmNPV, we tried to expand their host range through homologous recombination and successfully constructed a hybrid baculovirus of AcNPV and BmNPV, designated as HyNPV. The hybrid baculovirus can infect the hosts of both AcNPV and BmNPV. Taking the human basic fibroblast growth factor (bFGF) gene as an appli-cation example, we constructed a recombinant, HyNPV-bFGF. This construct is able to express the bFGF protein both in silkworm larvae and in common-use cell lines, sf21, sf9 and High-five. Moreover, to reduce the loss of recombinant protein due to degradation by proteases that are simultaneously expressed by the baculovirus, we knocked out the cysteinase gene coding for one of the most important baculovirus proteases. This knockout mutation improves the produc-tion efficiency of the bFGF recombinant protein.

关键词： AcNPV,BmNPV,host range,insect-baculovirus expression system,cysteinase gene.

The release of ^(14)C-chlorsulfuron bound residue by autoclaving method and its identification

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 1999年第2期10卷 105-110页

作者： GUO Jiangfeng SUN Jinhe PING Xiaofei YE Qingfu(Instiftrte of Nuclear Agricultural Science, Zhejiang University (huajiachi campus),Key Las. of Nuclear Agricultural Science, the Ministry of Agriculture, Hangzhou 310029, China National Rice Research insti Institute of Nuclear Agricultural Science Zhejiang University (Huajiachi Campus) Ministry of Agriculture Hangzhou 310029 China China National Rice Research Institute Hangzhou 310006 China

When individual microorganisms were used to release bound pesticide residues, it was ussually not take into full account whether the autoclavingmethod could lead to the release of bound residues. The soil containing bound 14Cchlorsulfuron residues was treated with an autoclave in this study. The results revealthat the bound 14C-chlorsulfuron residue can be released from the soil when treatedwith the autoclave and the release rate can be remarkably enhanced by adding water into the soil when subjected to such treatment. A TLC analysis showed that thereleased 14C-residue was one of the degraded products of 14C-chlorsulfuron. Afterderivatization and analysis using the GC-MS, the released 14C-residue was tentativelyidentified aS 2-amino-4-hydroXyl-6-methyl-1,3,

关键词：土壤农药残留量释放

Antibacterial interactions of monolaurin with commonly used antimicrobials and food components

在线全文

学校读者我要写书评

暂无评论

Antibacterial interactions of monolaurin with commonly used ...

Impact of pH on Microbial Biomass Carbon and Microbial Biomass Phosphorus in Red Soils

第二届两岸四地营养改善学术会议

作者： Hui Zhang,Fengqin Feng Department of Food Science and Nutrition,huajiachi campus,Zhejiang University, Hangzhou 310029,China

Objective Monolaurin is a nontraditional antimicrobial agent which possesses better antimicrobial activities but causes no health problems to ***,concentrations of monolaurin greater than 500μg/mL may lead to an unpleasant soapy odour and taste thereby limiting the amounts used.A possible solution may be using combinations of

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Pedosphere 2004年第1期14卷 9-15页

作者： CHENGuo-Chao HEZhen-Li WANGYi-Jun DepartmentofNaturalResourceScience CollegeofEnvironmentalandResourceSciencesHuajiachiCampusZhejiangUniversityHangzhou310029（China） LanxiMunicipalRunningWaterCorporation Lanxi321100（China）

The impact of pH changes on microbial biomass carbon (Cmic) and microbial biomass phosphorus (Pmic)were examined for 3 red soils under citrus production with different lengths of cultivation. Soil pH significantly affected Cmic and Pmic. The Cmic and Pmic changes, as a function of soil pH, appeared to follow a normal distribution with the original soil pH value at the apex and as pH increased or decreased compared to the original soil pH, Cmic and Pmic declined. Moreover, there were critical pH values at both extremes (3.0 on the acidic side and 8.0 to 8.5 on the alkaline side), beyond which most of microorganisms could never *** effect of pH on Cmic and Pmic was also related to the original soil pH. The higher the original soil pH was, the less Cmic or Pmic were affected by pH change. It is suggested that soil microorganisms that grow in a soil environment with a more neutral soil pH range (I.e. pH 5.5-7.5) may have a greater tolerance to pH changes than those growing in more acidic or more alkaline soil pH conditions.

关键词： microbial biomass carbon microbial biomass phosphorus red soils soil pH

Distribution of ^(14)C-chlorsulfuron bound residues in soil organic matter

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 1999年第3期10卷 171-175页

作者： GUO Jiangfeng SUN Jinhe YE Qingfu (Institute of Nuclear Agricultural Science, Zhejiang University(huajiachi campus),Key Laboratory of Nuclear Agricultural Science, the Ministry of Agriculture,Hangzhou 310029) 浙江大学农业与生物技术学院核农学重点开放实验室浙江杭州 310029 浙江大学农业与生物技术学院核农学重点开放实验室浙江杭州

The reason why chlorsulfuron(2-chloro-N-[4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide)bound residues can still make an in-jury to rotational crops is still kept unknown. The experiment was conducted under laboratory conditions to determine the dynamics of extractable and non-extractable (bound) residues of chlorsulfuron in soil, and the distribution of chlorsulfuron bound residues in organic matter fractions. The results showed that extractable 14C-residues decreased t0 25.12% of applied chlorsulfuron over an incubation period of 150 days;this in turn, the formation of bound residues increased to 47.07% of the applied. The proportions of 14C-bound residues in soil organic matter fractions increase in order of: humic acid (HA)

关键词：土壤有机质灰黄霉酸腐殖酸

在线全文

学校读者我要写书评

暂无评论

Oracle8i数据库系统的优化与调整

计算机工程 2001年第6期27卷 180-182页

作者：陆晨音浙江大学华家池校区计算中心杭州310029

主要从内存及盘空间的占用和盘I/O等方面，阐述了如何根据Oracle8i数据库系统的运行参数，按系统应有的最佳运行指标，实现对系统性能的优化和调整。

关键词： Oracle8i 数据库系统优化调整应用程序

在线全文

学校读者我要写书评

暂无评论

免费邮件服务器实现用户网上注册的配置方法

计算机工程 2002年第2期28卷 268-269页

作者：陆晨音浙江大学华家池校区计算中心杭州310029

介绍了在平台下,利用和软件,免费邮件服务器实现用户在网上注册的一种配置方法。WindowsExchange ServerSQL

关键词：用户注册免费邮件服务器 SQLserver 计算机网络电子邮件

Genotypic Differences in Growth and Physiological Responses to Transplanting and Direct Seeding Cultivation in Rice

在线全文

学校读者我要写书评

暂无评论

Rice science 2009年第2期16卷 143-150页

作者： CHEN Song CAI Sheng-guan CHEN Xin ZHANG Guo-ping Agronomy Department Huajiachi Campus Zhejiang University Hangzhou 310029 China

The field experiments were conducted to investigate the growth and physiological responses of six super hybrid rice combinations to two planting methods, transplanting （TP） and direct seeding （DS） during 2006-2007 and 2007-2008. The 1000-grain weight and number of tillers per plant at the early growth stage, the maximum quantum yield of PSII （Fv/Fm） and transpiration rate （Tr） were higher in DS plants than in TP ones, whereas the grain yield, number of panicles per square meter, seed setting rate, net photosynthetic rate （Po） and stomatal conductance were lower in DS plants. However, little difference was detected in number of grains per panicle, stem （shoot） and leaf weight between the combinations in the two planting methods. The responses of plant growth and physiological traits to planting method differed greatly among the six combinations. In both planting methods, Chouyou 58 and Yongyou 6 had the highest and lowest panicle biomass and Pn, respectively. The higher yield of Chunyou 58 was associated with more numbers of panicles per square meter and grains per panicle in both planting methods. The results indicate that lower grain yield in DS relative to TP is attributed to more excessive tillers at the early stage, lower leaf biomass and photosynthetic rate at the late stage.

关键词： rice Oryza sativa direct seeding transplanting genotypic difference photosynthesis biomass