Abstract:采用试验生态学的方法,研究了残食行为、规格差异和饵料密度对杂交鳢仔稚鱼残食的影响.结果表明:当杂交鳢仔鱼全长达到1.30 cm(7日龄)时出现残食.同规格杂交鳢仔稚鱼饱食状况下几乎没有残食现象,而全长2.21cm仔鱼在饥饿状况下表现出了较高的残食率;规格差异越大,残食率越高,全长比为0.57:1.00、0.50:1.00、0.39:1.00的3个试验组的残食率分别为18.35%、46.65%、61.67%,差异显著;饵料缺乏时的残食率显著高于饵料充足时,全长2.21 cm杂交鳢仔鱼饲养7 d,不投饵和饱食情况下的残食率分别为46.67%和1.11%,差异显著;以日投喂率0%、5%、15%饲养杂交鳢仔稚鱼(全长比为0.50:1.00)5 d,残食率依次为83.33%、35.00%、3.33%,差异显著.可见,规格差异和摄食状况对杂交鳢仔稚鱼的残食都有显著影响.生产上,小个体和大个体全长比低于0.60;1.00时,及时分池饲养是提高杂交鳢仔稚鱼成活率的重要途径.

Abstract:Rice has become a model cereal plant for study.And rice molecular linkage map has been an important premise for carrying out molecular genetic research.Centromere is an important organelle of chromosome for eucaryotic cell.It is also a key structure of eu

Abstract:In order to establish a real-time PCR method for rapid detection of Ranavirus(family Iridoviridae),the MCP gene of Ranavirus were down-loaded from GenBank.The gene sequences of MCP were aligned by using the biologic software and the specific primers and p

Abstract:Dehydration responsive element binding 1E(DREB1E),induced to express in high-salt stress,is a member of CRT/DRE binding factors(CBFs)in Arabidopsis.A partial gene homologue to DERB1E was obtained from Thellungiella halophila using PCR-based technique with

Abstract:The Bassam and Sanguinetti methods are the most frequently used silver staining techniques for the detection of AFLP marker at present.In this study,we compared the efficiency of the re-amplification of AFLP bands recovered from polyacrylamide gels staine

Abstract:The flowering habits of photo-and thermo-sensitive genic male sterile(PTGMS)lines Hua884S,Hua885S,Hua886S,Hua893S,Hua328S and Pei'ai64S(CK)were systematically surveyed.Flowering duration of single plant and single panicle of Hua885S was the shortest,which

Abstract:记述采自广西九万山地区短翼蚱科波蚱属Bolivaritettix昆虫1新种,即褐背波蚱Bolivaritettix ochro-notata sp.nov..模式标本保存在陕西师范大学动物研究所标本室(1♂1♀)和广西河池学院动物标本室(2♂).

Abstract:Root knot nematodes collected from Guangdong Province and Hainan Province were identified by using morphology,isozyme,mtDNA-PCR,and rDNA-IGS-PCR.Meloidogyne enterolobii were found to parasitize pigeonpea,guava in Hainan Province and capsicum,pumpkin,cowpe

Abstract:Fifty-eight isolates of Rhizoctonia spp.were isolated from thirteen plants in Guangdong Province.After determining their classification of Rhizoctonia spp.and anastomosis groups(AGs)of Rhizoctonia solani,these isolates were all tested on rice,sweet corn,c

Abstract:Occurrence of the entomophthoralean fungus,Pandora neoaphidis(Zygomycetes:Entomophthorales)was investigated on Myzus persicae,Brevicoryne brassicae,Lipaphis erysimi in crucierfous vegetable system.Results showed that P.neoaphidis was the main entomopathog

Abstract:从α-萘乙酸出发,衍生合成了萘乙酸甲酯、萘乙酰肼、丙酮萘乙酰腙、唑酮萘乙酰腙、萘乙酸三唑醇酯和萘乙酸烯唑醇酯,并通过核磁共振氢谱进行了结构表征.测定了所有化合物诱导大豆苗生根的活性和萘乙酸三唑醇酯、萘乙酸烯唑醇酯的室内抑菌活性.结果表明,所有衍生物均具有一定的植物生长调节活性,其活性的大小与化合物的油水分配系数没有直接的相关性;α-萘乙酸与三唑醇和烯唑醇等杀菌剂成酯反应后,酯化产物的抑菌活性比三唑醇和烯唑醇本身的抑菌活性低.

Abstract:In this paper,the insecticide resistance level of rice stem borers(Chilo suppressalis Walker and Tryporyza incertulas Walker)from four cities were tested by using Triazophos and Avermectins every year since 2005.The results show that the pests have obviou

Abstract:Additive series experiment and curve fit were adopted to study the change of yield characters of oilseed rape under different density of Conyza canadensis.The results showed that with the interference of Conyza canadensis,the pod number,seed number,yield

Abstract:结合1995/2000年Lantlsa TM影像数据及1∶10 000土地利用现状数据库数据与相关资料,研究了汉江流域中下游(湖北省境内)土地利用变化,研究结果表明:(1)该区的土地利用强度大.1995年与2000年的土地利用强度指数分别为260.025和260.526,说明该区土地利用开发的强度有增大的趋势;(2)从土地利用双向动态变化率来看,该区未利用地(变化率为4.391)正在被加速开发,草地(2.836)与水域(1.664)受干扰严重,这对汉江流域及整个长江流域的生态环境将产生深刻的影响;(3)由于总面积较大,变化面积最大的耕地及林地土地利用双向动态变化率分别为0.424和0.344,说明维系该区人-地系统的基本因素保持相对稳定.本研究还表明,利用RS/GIS结合区域土地利用现状数据库数据研究土地利用变化是一种有效的方法.

Abstract:A field experiment was conducted to study the dry matter accumulation and nutrient uptake of 4 double-low rapeseed varieties.The results showed that the proportion of dry matter accumulation during the period of seedling(140 d after sowing),budding(140-17

Abstract:Different forms of N and P in the three sediment cores from Liangzi Lake were measured.The results showed that the content of nitrogen and phosphorus in the sediment core 3 were higher than that in sediment core 1 and 2.The content of NO3--N in pore water

Abstract:采集具有次生盐渍化特征的大棚土壤,对土壤浸提液电导率和盐分化学性质进行相关性分析.结果表明,土壤浸提液总盐含量(SSC)、Cl-和Ca2 是影响土壤浸提液电导率的主要因素,NO-3、K和Na 对土壤浸提液电导率直接效应并不明显,而主要通过其它各化学性质要素的影响产生间接效应,使其与土壤浸提液电导率间仍有较大的相关系数;土壤浸提液离子强度与其电导率亦显著相关,并可表示为I=0.017 6EC.

Abstract:从发生冻害的植物组织中分离到1株冰核细菌MB03,该菌株在-3℃时在2 min内的冻结率达到96.5%,而产生1个冰核所需要的细胞数约为2.9×103个,其冰核活性明显高于冰核细菌标准菌株和其它分离菌株.进一步对MB03进行了鉴定,经个体形态与培养特征观测、部分生理生化反应、G C摩尔分数测定、16SrDNA序列对比分析、菌落原位杂交探测特异性基因和PCR扩增冰核基因等鉴定,确定该菌为丁香假单胞菌(P5eudomonas syringae).

Abstract:从湖北省某重金属矿区土壤中分离到1株抗Cr6 (Ⅵ)的菌株,命名为MDS07.该菌株可以在含12 mmol/L/的Cr6 (Ⅵ)培养基上正常生长.经对该菌株进行形态观察和16S rDNA序列比对分析,确认该菌株为巨大芽孢杆菌Bacillua megaterium.通过构建系统发育树,分析了该菌在系统发育中的地位.对MDS07进行了重金属抗性谱研究,结果表明该菌株对Cr、Zn、Ni等重金属具有较高的抗性.进一步研究发现,MDS07菌株同时含有chrB、czcD和nccA等基因,它们分别具有Cr、Zn、Ni等重金属抗性,表明MDS07菌株的重金属抗性是由抗性基因引起的.

Abstract:After designing primers based on published sequences of the pig leptin gene(GenBank accession number:U66254 and AF026976),denaturing high-performance liquid chromatography and directly sequencing were used to indentify single nucleotide polymorphisms(SNP)

Abstract:选用80头体重为40 kg左右的杜×(长×大)三元杂交猪,随机分为5个处理,每个处理公、母各半,分别饲喂可消化赖氨酸(DLys)水平为0.59%、0.67%、0.75%、0.83%和0.91%的等能、等氨基酸模式的玉米-豆粕型日粮.通过测定其生长性能和血清生化指标的变化,确定生长肥育猪的最佳DLys水平.结果表明:生 .长肥育猪的平均日增重、料重比均随饲粮DLys水平的增加呈显著的二次曲线变化.当DLys水平分别为0.78%和0.80%时,平均日增重和料重比分别达到极大值(791.42 g)和极小值(2.92).当DLys水平为0.75%时,胰高血糖索、胰岛素、甲状腺素T3和T4浓度最高,血糖浓度最低.上述结果提示,40～70 kg生长肥育猪的日粮适宜DLys、粗蛋白水平分别为0.78%、15.66%.

Abstract:240日龄健康溆浦鹅种鹅180羽,随机分成5组,每组3个重复,每个重复12羽,1组为注射组(每隔10 d注射LHRH-A3,10μg/羽),另外4组分别口服(拌料饲喂)0、5、10、15μg/羽LHRH-A3.经21 d预试和60 d试验,结果显示:口服10μg/羽LHRH-A3,溆浦鹅产蛋率显著提高;各口服处理组蛋品质、受精率、孵化率和健雏率无显著影响.

Abstract:To investigate the mechanisms for cytopathic effect(CPE)of herpes simplex virus type 2(HSV-2)in ECV304 endothelial-like cells,RT-PCR and indirect immunofluorescence were used to detect HSV-2 infection.Phase-contrast and electron microscopy were performed

Abstract:A total of 360 fresh seashells samples were collected from five different Ningbo's retail markets from March to June of 2007.The samples were tested for 11 items of morphological,physiological and biochemical characteristics and five representative strain

Abstract:The sexual dimorphism in morphological traits and female individual fecundity of Cyprinus carpio var.color,distributing in Oujiang river base,Zhejiang Province,were analyzed in this paper.The results indicated that body weight and body length from juvenil

Abstract:研究了浸种时间、栽培温度、播种密度和采收时间等因素对豌豆和萝卜芽苗菜的生长、产量以及营养品质的影响.通过分析不同处理条件下萝卜和豌豆发芽率、苗长、产量、维生素C及纤维素含量发现:豌豆芽苗菜在播种密度为2.4 kg/m2、浸种24 h、温度20～25℃左右、培养8 d后采收的经济产率和品质最佳;萝卜芽苗菜在播种密度为0.5 kg/m2、浸种6 h、温度25℃左右、培养7 d后采收的经济产率和品质较为理想.

Abstract:Using field experiment and grading by fruit length,the effects of five kinds of legume lengths on fruit quality of yellow and red okras were studied.The results showed that the content of soluble sugar,soluble protein and vitamin C in Hibiscus esculentus

Abstract:Cymbidium goeringii(Orchidaceae)germplasm demonstrates high morphological diversity in Guizhou Province of China.To satisfy the protection of the wild germplam,the genetic diversity of 65 accessions,among which 47 derived from Guizhou,was evaluated using

Abstract:Based on the analysis of 1.5 m's negative and positive air ions concentration about 21 plant communities of Shanghai,results showed that:the ability of increasing negative air ions concentration about plant communities was markedly compared with no greeni

Abstract:In order to select the most suitable tree peony cultivars planting in the area of South Yangtse River of China,the changes of morphological,physiological and biochemical indices after submergence stress of eight cultivars were studied in this paper.The re

Abstract:The structures of fruit and fruit fairs of the Platanus acerifolia were invested by the digital light microscope and the scanning electron microscope(SEM).The surface of fruit is nuts and fruit hairs in the end of nuts.The inside of fruit is receptacle wi

Abstract:利用冰温贮藏,测定了莲藕的冰点、色度、多酚氧化酶(polyphenol oxidase,PPO),总酚、水份含量、还原糖、可溶性蛋白的变化,并与冷藏下的莲藕作了对比试验.结果表明:莲藕的冰点为-1.7℃;在冰温下贮藏,莲藕色度变化缓慢,变化幅度低于冷藏;PPO、总酚、水份含量的变化均小于冷藏;而还原糖、可溶性蛋白含量的变化在冰温下与冷藏差异不大;在冰温条件下,莲藕各种理化指标变化很小,对莲藕品质的影响较小,能有效保持莲藕的原有风味.

Abstract:The effects of different types of alkali reagents and their concentration on the properties of reversible konjac glucomannan gel were studied.Response surface analysis was used to optimize the preparation conditions of reversible konjac glucomannan gel.Th

Abstract:A preliminary study on fast recognition of tea species was carried out by using near infrared spectros(NIRS)copy method.The spectrum curves of four species of tea were measured by two different models of NIR analyzers.The comparative study was done with t

Abstract:The multiple rice cropping system has existed in southern China for a long time.Such system inchludes rape-rape-rice rotation,wheat-rice rotation,two-harvest rice and green manure-rice etc.A practical problem is the high stubble-mulch can be hardly overtu

Abstract:System of intelligent robot detecting and grading eggs(SIRDGE)consists of six subsystems.They are image capture by scene video camera and the camera calibration,algorithm for processing images and feature extraction from them,motion controlling and trajec