Abstract:荔枝果实(糯米糍、槐枝)在1℃、5℃、8℃下进行贮藏试验。 低温下荔枝果皮细胞电解质渗漏率升高,当渗出率达到50％果实遭受不可逆的冷害。 低温下果实呼吸作用、乙烯释放、ACC(1-氨基环丙烷-1-羧酸)合成均降低。 实验结果证明荔枝果实的冷藏适温是5℃、在本贮藏条件下糯米糕、槐枝可贮30～35天、好果率85％、货架期24小时。

Abstract:Fuzzy cluster analysis of 13 families in Yuehuang chicken was made on the basis of the polymorphisms at 10 bleed protein loci (Akp - 1, Akp-2, Amy - 1, Amy-2, Es-1, Es-2, Hb- 1, Hb-2, Pas and Tf ) in an experiment. The result of this analysis was compared with that of the systematic cluster analysis tastd on 9 quantitative traits. It is believed that the cluster analysis based on the protoin polymorphisms is significant for line breeding in Yuehuang chicken and that each of two cluster analysis methods has its advantages for application. The genelic structure of these families and variabilities among them were also studied.

Abstract:The copper content in stick lac has not been reported. The copper content in stick lac as determined by atomic absorption spcctlophotometry was 9.49 ppm. The copper content in coarse seed lac, fine seed lac, powder lac, and corpses of the lac insect, these four flassified components of stick lac were 8.06 ppm, 13.44 ppm, 16.38 ppm, 49,66 ppm respectively by the same method.The copper in stick lac existed mainly in the corpses of the lac insect and that was the main pollution source causing copper pollution in laccaic acid (lac dye ) . The fact that copper pollution of laccaic acid in stick lac could not be avoided was concluded after considering its biological source and chemical nature.

Abstract:The embryonic morphological development of the guinea fowl at different stages was observed with the naked eye and microscope. The sequence of organ formation in the guinea fowl was similar to that of the chicken .The weights of early embryos within 10 days of incubation increased slowly, but rose fast after 10 days of incubation up to hatching, According to the state of the embryonic development and weight increase, the process of embryonic development could be divided into three it ages, early, middle and late.

Abstract:Twelve soils derived respectively from basalt, granite and seashore deposit were collected and cropped with grass (Coasteross-1 Pertrudagrass ) and corn in the greerhouse.The soil analysis data showed that all soils tut one bad relatively low content of total Mg. The soils derived from basalt were rich in exchangeable Mg( more than 100 ppm Mg in the top-soils ) .The soils derived from granite and seashore deposit were poor in exchangeable Mg. (ranging from 11.1 to 25.3 ppm in the topsoils) . There were significant correlations among different forms of magnesium.Exchangeable Mg in the topsoils correlated significantly with soil pH and CEC. Mg concentration in the grass and corn was well correlated with Initial total Mg, acid soluble Mg, exchangeable Mg and Mg saturation of CEC.Its correlations with exchangeable Mg and Mg saturation of CEC were much more significant. So was-the total Mg removed ty these two crops. Acid soluble Mg was available to the grass and corn,but its release was too slow to meet the requirement of plant growth.It waa concluded that exchangcable Mg and Mg saturation of CEC are better indices for evaluating the magnesium availability of the soils and the effects of magnesium fertilizer on plant growth .

Abstract:The present paper is a report of four new species of Bambusoideae from Guangdong, which are Pleioblastus albo-sericeus; p. yingdeensis; Arundinaria multirervis and A. tenui-vagina.

Abstract:本文报道广谱抗寄生虫药丙硫咪唑在猪体内的药物动力学研究。选用6头健康杂种猪,体重为38.0±4.6kg,按10ng/kg的剂量胃管灌服丙硫咪唑混悬液,服药前后按计划定时从前腔静脉采集血样。用乙醚萃取法提取血浆中的药物,反相高效液相色谱法同时测定血浆丙硫咪唑及其代谢产物丙硫咪唑亚砜及砜的浓度。测定时以甲苯咪唑为内标,色谱条件:Zorbax ODS柱(25cm×4.6mm),流动相为甲醇:水(80:20.V/V),流速1.0ml/mir,UV检测波长292nm.测定结果表明,在给药后3分钟采的血样已不能测到丙硫咪唑的原形药物,而其两种主要代谢产物亚砜及砜在给药后36小时仍可测到(最低检测限:亚砜及砜均为0.02μg/ml)。亚砜及砚的主要动力学参数分別是:峰浓度3.22±0.39、1.91±0.80μg/ml,真达峰时间10.00±5.93、20.67±4.46小时,消除半衰期5.93±2.31、9.17±2.30小时,药时曲线下面积52.38±10.73、32.23±9.10μg.h/ml.丙硫咪唑在猪体内的抗蠕虫活性目前认为是由于在肝脏代谢生成的产物亚砜的作用。

Abstract:Seven new species of Cercospora were collected from Shaoqing Prefecture of Guangdong Province. They were: Cercospora alpinlcola on Alpinia oxyphylla, C. alpini-katsumadaicola. C. alpini-katsumadae on Alpinia katsumadai, C. sauropi on Sauropus spatulifoltus,C.evodio-ru:aecarpae on Evodia rutaecarpa, C. andrographicola on Andrographis paniculata, and C. puerariana-thomsona on Pueraria thonsoni. Detailed descriptions and Latin diagnoses are given lor these species.Type specimens of the new species are deposited in the Department of Plant Protection, South China Agricultural University, Guangzhou, China.

Abstract:在24～30℃温度范围内,品种抗性在不同光照时数阳光强度的影响下存有极显著的差异。弱、短光照会使品种的抗性减弱甚至丧失。 光温对抗虫机制的影响,首先表现在品种的非嗜好性方面,其中光照时数对非嗜好性有极显著影响,温度和光强度也育显著的影响,30℃比24℃表现的非嗜好性较强。光照时数和光强度对非嗜好性有显著的交互作用。

Abstract:在染色体标本制备中,对黄豆离体根尖用0.002M8-羟基喹啉、0.05％秋水仙碱及前二者的等量混合液分别在18℃恒温下前处理三小时,冷蒸馏水(4℃～5℃)中前处理22小时,以8-羟基喹啉在18℃处理出现的中期分裂相最多。用0.002M8-羟基喹啉在18℃～20℃恒温下,对黄豆和花生根尖进行不同间隔时间前处理,结果观察到黄豆根尖的晚前期和中期分裂相以3～3.5小时最多;花生根尖的中期分裂相以2～4小时最多。