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关键词： 动物有机废弃物   氨基酸   微量元素   螯合肥料   生物学效应  

摘要： 该试验重点研究了以动物有机废弃物为主要原料,制备氨 基酸螯合微肥的工艺条件及其在蔬菜和果树等不同经济作物的应用效果,研究表明：1、按该工艺,动物有机废弃物水解为复合氨基酸的生成率（84.78%）较高,且氨基酸的种类多（含有17种氨基酸）.由于制备过程中采用了氨基酸配体与微量金属元素的最佳重量比控制方法,确保了微量金属元素与氨基酸的螯合效果（螯合率在97%以上）.经检测,该工艺配制的氨基酸螯合微肥稳定性较好,各项主要技术指标均符合国家氨基酸叶面肥标准.2、该工艺设备简单、操作方便,主要材料动物有机废弃物来源十分广泛;而辅助的化工原料在任何地方化工公司均可购得,不会存在主、辅材料供应不上的问题.3、不同浓度氨基酸螯合微肥对芹菜和马铃薯的肥效试验结果表明,蔬菜喷施氨基酸螯合微肥的最佳浓度为稀释500倍,施肥的最佳时期为蔬菜营养生长盛期.4、不同处理对小白菜的肥效试验结果表明,氨基酸螯合微肥的肥效显著高于氨基酸、氯化铵和微量元素肥料分别施用时的肥效,说明氨基酸螯合微肥中的氯化铵、微量元素和氨基酸这些成分被作物吸收后出现了互补增效现象.5、从氨基酸螯合微肥对不同蔬菜和果树的肥效试验结果分析总结得出,该螯合微肥能有效的增强蔬菜和果树对营养物质的吸收,提高光合作用,加速蔬菜和果树的营养生长,尤其对增加产量、改善品质和提高经济效益有显著作用.该研究从原料的收集、肥料的生产及施用均从资源的清洁再利用和农业的可持续发展的角度去考虑,因而具有明显的经济效益、社会效益和环境效益.

关键词： 铬   生物学功能   动物体   代谢  

摘要： 通过对铬元素的各项理化特性、来源、代谢及生物学功能进行详细的对比、调查和研究 ,进一步阐述了铬元素的代谢机制、生物学功能与铬在家畜营养学、生物科学及人体医学等方面的重要作用。表明铬元素对人类的生产生活 。

关键词： symbiosis   systematics   Leptonacea   Lasaeidae   Montacuta  

摘要： The distribution, prevalence and abundance of the galeommatoidean bivalve, M,sella pedroana, on the spiny sand crab, Blepharipoda occidentalis, were studied based on newly collected material and museum specimens. Although sometimes free-living, M. pedroana occurs most often inside the branchial chamber of B. occidentalis, and appears to be a commensal associate. It is not known from outside the range of the host along the Pacific coast of California and Mexico. Approximately 60% of hosts examined contained typically 1-2 M. pedroana in their branchial chambers, but many more (maximum 22) were sometimes found. M. pedroana showed no preference for host sex, size, or branchial chamber (left vs. right) and were not more abundant in any part of the distributional range. No M. pedroana were found on specimens of the five taxa mostly closely related to B. occidentalis. M. pedroana is re-described and its systematic position discussed with special reference to difficulties of generic placement. Although the presence of the bivalves causes physical deterioration to the hosts' gill filaments, available evidence indicates that the relationship is commensal, rather than parasitic.

关键词： 艾氏腹水癌   克隆细胞株E2G8   小鼠   动物模型   生物学特性   癌细胞   接种  

摘要： 目的　比较不同品种 (系 )小鼠接种E2G8细胞株的某些生物学特性。方法　将E2G8细胞稀释成不同浓度 ,接种KM、DBA 2、6 15、C57BL 6及BALB c小鼠皮下或腹腔 ,观察小鼠出现可见肿块 腹水时间及小鼠生存时间 ;测量肿块直径 (cm)及瘤重 ;荷瘤小鼠腹腔注射环磷酰胺 (CTX) ,观察E2G8细胞肿瘤模型对CTX治疗的敏感性。结果　E2G8接种BALB c、6 15小鼠皮下毒性最大 ,DBA 2、C57BL 6小鼠次之 ,接种KM小鼠皮下毒性最小 ;接种DBA 2、C57BL 6、6 15小鼠腹腔毒性较大 ,致死性高 ,对BALB c和KM小鼠的致死性弱 ;E2G8瘤细胞在KM和 4种纯系小鼠皮下均能很好生长肿瘤 ,其中在KM小鼠皮下肿瘤生长最大 ,在BALB c小鼠皮下肿瘤最小 ;KM、C57BL 6、6 15、DBA 2、BALB c小鼠皮下接种瘤细胞第 12天瘤重分别为 (2 4 0± 1 30 ) ,(0 90± 0 4 8) ,(1 2 0± 0 38) ,(1 10± 0 2 9) ,(0 80± 0 30 )g ;E2G8细胞接种 5个不同品种 (系 )小鼠制备的肿瘤模型 ,用CTX治疗 ,抑瘤率由高到低依次为6 6 7% (6 15 ) ,5 5 0 % (BALB c) ,5 3 3% (C57BL 6 ) ,5 0 % (KM) ,36 4 (DBA 2 ) ,其中 6 15小鼠建立的模型对CTX的治疗最敏感。结论　E2G8细胞株接种 5个不同品种 (系 )小鼠 ,所测生物学特性不完全相同 ,但是从腹腔 皮下接种、CTX?

关键词： 动物生物学   教学内容   知识体系   构建   课程内容   实践教学   实习质量  

摘要： 本文从动物生物学课教学内容构思上 ,强调以进化为主线 ,动物生物学原理为基础 ,动物演化发展上具转折性关键门类为重心 ,阐述基本原理、基础知识和生命活动基本规律 ;在实践教学上 ,除对动物形态、作用观察外 ,应加强学生技能和创造性思维能力的训练 ,还需不断提高野外实习质量。

关键词： Animals   Female   Maternal-Fetal Exchange   Models, Animal   Placenta/physiology   Pregnancy   Species Specificity   Vertebrates/physiology  

关键词： amphibians   xenoestrogens   reproduction  

摘要： In this paper, the effects of an estrogenic compound, 4-nonyl-phenol (NP), on the amphibians Rana esculenta and Triturus carnifex are described together with those on sexual differentiation in Xenopus laevis. NP increased plasma vitellogenin in male frogs and newts in a dose-related manner;moreover, inhibitory effects on gonadotropin and prolactin (PRL) secretion by pituitary were found together with an elevation of plasma androgens. NP treatment also caused a remarkable increase in number of prolactin-immunolabeled cells, suggesting that xenoestrogen might induce, at least in the newt pituitary, a PRL accumulation possibly due to a reduction of the hormone release. In addition, both NP and bisphenol A caused feminization by increasing the percentage of female phenotypes in X. laevis, and the in vivo effects were more pronounced than those of estradiol-17beta. (C) 2002 Elsevier science (USA).

关键词： 动物代谢调控   日粮营养   基因表达   分子生物学基础  

摘要： 就日粮营养对基因表达调控的关键控制点进行了分析 ,重点讨论了日粮营养受限条件下动物基因表达的调节情况以及氨基酸、微量元素、多不饱和脂肪酸及共轭亚油酸、维生素对于体内关键的代谢酶的基因表达的调控作用。

关键词： biological control agent   Coccinellidae   biology   Biological Science Disciplines   Diomus   Coleoptera   Homoptera   Sipha flava   Predators  

摘要： Diomus terminatus is an adult and larval predator of the yellow sugarcaneaphid in south Florida. A description of the immature life stages and some of the basic biology werepresented. We found that head capsule widths proved to be the most reliable method for determininglarval instars. Further studies on its biology are needed to evaluate its potential as a biologicalcontrol agent against yellow sugarcane aphid.