Abstract:该研究在建立分泌减蛋综合征病毒单克隆抗体杂交瘤细胞株的基础上，鉴定了１０株杂交瘤细胞所分泌的单克隆抗体（４Ｂ１，１Ｄ４，２Ｄ６，３Ｄ６，２Ａ１，３Ａ５，３Ｃ６，３Ｃ１，１Ｂ３和２Ｃ５）和生物学活性，这１０株杂交瘤细胞分泌的抗体有高度的特异性，只特异地作用于减蛋综合征病毒，微量血凝抑制试验（ＨＩ）发现４Ｂ１，３Ｃ１，２Ｃ５和３Ｃ６有血凝抑制活性，腹水效价分别为２４（ｌｏｇ２），４（ｌｏｇ２），７（ｌ

Abstract:Natural infectiolls with Cryptosporidia in chickens,ducks and geese were investigatad at 5chicken farms, 5 duck farms and 3 goose farms in Guangzhou by flotation using Sheather' ssugar solution.In 124 of 882 fecal samples from chickens,273 of 1 004 from ducks,and 71 of571 from gase,cryptospondial oocysts were deted. The positive rates were 14.1%,27.2%and 1 2.4% respectively. According to the morphology and size,the oocysts were identifiedas Cryptosporidium baileyi.

Abstract:Rcsult of the studies showed that the essential oil from Cinnamomum micranthumwas highly effective against Tribo lium castaneum, an important insect pest of storedproducts.The oil was also proved to be safe to manunals when was used as a grainprotectant. Safrole,a predominant component of the essential oil has been determinedto be the insecticidally active ingredient of this plant through a series of bioassays.

Abstract:Every bes t cho ice of several main factors affecting the crude purification of p ap ayaringspot virus(PRV)(including kinds of propagation host,organic clarification agent,dis pers io n agent,centrifugal force fo removing sediment before coneentrating thevirus,supereentrifugal foree for concentrating the virus)as reported detailedly in thispaper.Jelly melon(Cu cum is metuliferus)was found to be a better propagation hostthan the Zucchini Squash(Cucurb itapepo).A simple proeedure of one cycle of diffe-rent speed contrifugation and one cycle of Cs_2SO_4 continuous density gradientsupereentrifugation with sugar cushion was designed.The virus preparation showed atypical ultraviolet absorption curve for nucleoproteins,A260/A280=1. 68,the yield ofvirus was 2.56 mg/100 g of infected squash leaves and the virus preparation couldbe suitable for the further research on the serology and molecular biology of PRV.

Abstract:diseased orchid plant samples representing 20 species from 7 cities ofGuangdong provinee were tested for cymbidium mosaic virus(CyMV),odontoglossumringspot virus(ORSV),cucumber mosaic virus (CMV)and papaya ringspot virus(PRV)with direct antigen coating ELISA(DAC-ELISA).CyMV was detected in 40 samplesand ORSV was detected in 26 samples,which represented 25;2% and 1 6.4% of total159 samples surveyed, respectively.Mixed infections with both viruses occurred in 6samples, representing 3.8 % of the total samples surveyed.CyMV infections were de-detected in Cymbidium sinense,C.sp.,C.faberi,C.pendulum,C.ensifolium,Vanda sp.Oncidium,Dendrobium sp. ,Cattleya; ORSV infections were detected in Cymbidiumsinense,C. sp.Vanda sp. , Doris sp.,Eria sp,Phalaenopsis sp,double infections withboth viruses occurred in C.sp.,Oncidium sp,Vanda sp.

Abstract:作物生态系统中，节肢动物形成比较完整的群落结构，对节肢动物群落的调查研究不仅是有害生物综合管理的基础工作之一，而且有害生物综合管理技术推广应用的前提与效果评价的一个侧面，根据对不同类型生境稻了肢动物群落的调查材料，讨论节肢的动物群落的季节性动态及这种动态异同性，由结果中见：（１）在物种及各类群的数量比例等方面，以大八镇山区稻田占优势，特别是天敌类群更为明显，在同一生境中，以植食性昆虫数量较多，而捕

Abstract:通过采用林间系统调查，平均历期时，组建得到湿地松粉介自然种群连续世代生命表，结果表明，越冬代初龄若虫期至第一代初龄若虫早期时的种群趋势指数Ｉ值为５．７０，完整第一代结束时间的Ｉ值为０．９２，表明下代种群数量将为当代种群数量的５．７０和０．９２倍，在新侵入区，没有发现寄生性天敌，捕食性天敌的排除作用控制指数ＥＩＰＣ为１．２６，表明捕食性天敌对该粉蚧的控制作用不明显，其它类因子是影响种群数量发展趋势的

Abstract:After pear(Pyrus bretschneideri Rehd.cv.Yali)leaves infected with Venturia nashicola,the permeability of cell membrane increased,photosynthetic rate dropped, the totalphenols content and the activity of polyphenol oxidase and peroxidase isoenzymerose.There was an additional band o f peroxidase isoenzyme sho wing up in the fastband area.

Abstract:According to the methods of type-R principal component analysis and fuzzyIS ODATA cluster analysis,the studied area was divided into 5 climatic types basedon 16 itenis of meteorological data from 385 counties.The method of stepwisediscriminant analysis was used for giving discriminant functions to types and sho wed89.35 % accuracy. Considering the result of fuzzy similarity priority ratio,the main re-gio ns fo r intro ductio n o f S lash pine(Pinus elliottii Engelm)in China was divided into 3 climatic regio ns and 4 climatic sub-regions, namely,clinlatically most suited,climatically suited and climatically less s uited regions for introduction,damp-hotclimatically most suited sub-region,humid climatically most suited sub-region warmclimatically suited sub-region,telnperate climatically suited sub-region.Each of theseregions was discussed;

Abstract:Niche characteristics o f 25 dominant populations in the forest communities o fBa baoshan,Guangdong,were studied by computing their niche breadth value andniche overiap value.The result showed that,among the dominant populations,Castano psisfargesii,C.cariesii,Lithocamus hancei and Schima superba had the highestniche breadth value,and the descending order of niche breadth was to some extent inaccordanee with the IV(Importance Value)sequence of the po pulations.Niche o verla pwas closely related to niche breadth Two populations with wide niche breadths usual-ly had a higher niche overlap value than those with narrow niche breadths o r whenone population had wide niche breadth and the other narrow niche breadth.Finally,the paper gives brief remarks on the niche studies and its application to forestrymanagement and silviculture.

Abstract:Ho ng Ko ng lies o n the north margin o f the Asian tropics.Its tree flora is dominatedby tropical elements,but possesses a distinct transitional nature between tropical floraand subtropical flora.The Hong Kong flora has a close relationship to that of SouthChina,being an extension and development of the tree flora of South China.

Abstract:One new species of Rhododendron,i.e, Rh.datiandingense Z.J.Feng is described asnew in this paper.

Abstract:水稻盆栽试验表明：１．不同量稻秆与等量尿系作基肥混合施用，稻秆有助于尿素氮在土壤中固定和残留，但减少了尿素氮被水稻的利用和水稻的产量，但混合肥料的Ｃ／Ｎ比为１０～２０时，水稻的实粒重与尿素单施的结果没有显著差异。２稻秆及尿素均不同量混合，但调节Ｃ／Ｎ比至１５作基肥施用，稻秆影响尿素的肥效及水稻的产量反应与尿素施用量有关，低尿素Ｎ用量时，尿素氮的肥效受抑制，以致水稻产量下降，高尿素Ｎ用量（≤Ｎ４５０

Abstract:Rice pot experiment was conducted with red earths and their paddys derived from graniteand basalt to study the differences in their P fertilizer zvailability and soil chemistrycharacteristics. It was found that for the red earth and its paddy soil derived from granite.the P availability was mainiy related to Fe and Al while for those from basait the Pavai-lability was related to not only Fe and Al,but also Mn. The mechanism of P fertiliser avai-lability in red earths affected by Fe and Mn in the soil-plant system was discussd.

Abstract:以青花菜南方慧星品种为材料，分３个播期，研究了青花菜生育过程对氮，磷，钾，钙和镁等矿质养分的和分布动态，结果表明，青花菜对氮，磷，钾的吸收，以氮最多，钾次之，磷量少，其吸收比例因生长期而不同，植株和各个器官的氮，磷，钾，钙和镁含量随生育过程逐渐降低，吸收量则逐步增加，其中花球分化发育期间吸收量占吸收量的７５％至８０％，花球分化发育前，大部分的主要矿质养分分布在茎叶，花球分化发育后逐渐减少，而分布在

Abstract:从烟叶中提取的超氧物歧化酶（ＳＯＤ），经ＰＡＧＥ垂直板电泳后，用氮蓝四唑（ＮＢＴ）法活性染色，并经凝胶薄层扫描（λ＝５９５ｎｍ），结果显示粗酶液有６条同工酶谱带，经纯化后的酶只有一条谱带。此纯酶液置冰箱３６ｈ后，可获得长方形结晶。结晶酶液用ＳｅｐｈａｄｅｘＧ－１００柱层析（１．５ｃｍ×１００ｃｍ）和ＳＤＳ－和ＳＤＳ－ＰＡＧＥ测得其分子量分别为２４８３０和２８９００。用等电聚焦电泳测得该酶等电点为６．８０。该酶在ｐＨ５～９范围内活性较稳定，在７５℃保温１５ｍｉｎ活性尚保留５４％。此酶对ＫＣＮ、氯仿－乙醇不敏感，但受到ＥＤＴＡ，Ｈ_２Ｏ_２的强烈抑制，表明烟叶中分离纯化得到的ＳＯＤ为酶分子中结合Ｆｅ的Ｆｅ－ＳＯＤ。

Abstract:采用５℃层积下的伊贝母鳞茎，进行了核酸含量及更新芽超显微结构变化的研究，发现了伊贝母鳞茎休眠解除过程中的一些规律性变化。两次ＲＮＡ的积累时期，恰与电镜制片观察到的核糖体增加的时期相一致，还观察到了细胞中液胞，前质体的一些变化规律，并发现其与一些植物由营养生长锥向生殖生长锥转化时期所发生的变化相似。

Abstract:以农垦５８Ｓ为基因供体转育的Ｗ６１５４Ｓ，Ｋｓ－９，Ｎ１２Ｓ，Ｎ１５Ｓ，Ｎ１８Ｓ５个籼稻光温敏核不育系，１９９１～１９９３年在广州自然条件下观察了它们的育性变化，对温度诱导其有性转换规律进行了相关，多元回归及通径分析，结果表明：１．不同的不育系，其温敏性越强不育系温敏期越长，同一不育系，日最低温温敏期最长，日均温其次，日最高温最短，２．不同不育系各温度因素对花粉育性的影响不同，有的以日最低温影响最

Abstract:The authors investigated the measuring of the drying characteristics of wheat dur-ing deep-bed drying by observing the dynamics of continuous drying air. The studyelueidated fluid-to-gmin heat and moisture transfer and the change in avenlge moisturecontent of different layers of glain and demonstheted the change of fluid state and drying rateof wheat in a deep-bed.

Abstract:Leaves of Kuding tea(Ilex latifolia Thunb)contain many physiological active com-positions such as polyphenol,amino acids,etc. Through animal experiments,it wasfound that the Kuding tea had the curative effects of lowering blood pressure,andreducing both cholesterol and triglyeeride content of blood.Results of toxicologicaltests indicated that the Kuding tea is one kind of safe health food.

Abstract:At present,the taxomony of the subfamily Tylenchinae of nematode is principally basedon the morphological characteristics of female. There are many systematics of Tylen-chinae,there are very varied in different systematics. This article gives a review of thecurrent status and a approach to the development of taxonomy on the subfamily.

Abstract:Azadirachin has effects of antifeeding,stomach poison,contact poison,and growthinhibition on many insects. The main mode is disrption of endocrinic activities ininsect.Azadirachtin attacks neurosecretory cells,corpus cardicum prothoracic glands,etc.,causing interruption of synthsis and release of prothoracicotropic hormone(PTTH)in brain,and reduction of receptivity of prothoracic glands to PTTH which acco untsfor the shortage of 20-hydroxyecdysone in synthesis and release. For these reasons,gro wth and metamorphosis of insects were disturbed.The effects of azadirachtin onother tissues relative to synthesis and release of hormones for metamorphosis werealso discussed in this paper.