黔西北马缨杜鹃花红色素的毒性试验

马缨杜鹃（ＲｈｏｄｏｄｅｎｄｒｏｎｄｅｌａｖａｙｉＦｒａｎｃｈ．）是贵州省分布较广的一种植物。为提高其利用价值,对花的红色素进行了毒性试验。结果表明：急性毒性试验属实际无毒范围,Ａｍｅｓ试验,骨髓细胞微核试验和精子畸形试验均未显示诱变作用。为开发马缨杜鹃花资源提供了科学依据     

蚜虫性信息素田间引诱雄性桃蚜研究(英文)

据报道许多蚜虫性信息素的主要成分是（＋）-（1R,4aR,7S,7aR）-荆齐醇和（＋）－（4aS,7S,7aR）-荆芥内酯。应用这两种物质在1995年和1996年进行引诱桃蚜MyzusPersicae雄蚜的田间试验,在桃园的试验中取得了良好的效果,初步摸索出田间应用最佳时间与合适的配比。     

一种智能化的Y—型迷宫

本文介绍了一种智能化Ｙ－型迷宫的硬件、软件结构。它利用微机控制大鼠（或小鼠）分辨学习实验的全过程,利用红外光电传感器监测动物活动行为,判断准确,计时精确。由于以ＷＩＮＤＯＷＳ为工作平台,人机界面友好,操作简便。     

草鱼出血病病毒抗原亚单位的研制

通过比较溶液的离子浓度对病毒形态的结构的影响,发现ＧＣＨＶ在低盐溶液盐低温（－２０℃）保存条件下,外壳蛋白会自动降解,但不十分完全,采用含１％ＮＰ４０（Ｎｏｎｉｄｅｔ－ｐ４０）的稀盐溶液处理感染病毒的细胞,经冻融及差异离心,电镜下观察到纯度较高的病毒双层衣壳,核心衣壳及散在的子粒。纯化的病毒亚单位用核酸酶消化后,与等量的福氏佐剂混合,免疫家兔制备抗体,该抗血清经台和试验测定,显示了较强的中和病毒的     

Phytoplankton and bacterioplankton stress by sediment-borne pollutants

The effect of sediment-borne and released chemicals on the phytoplankton and bacterioplankton communities of a clay-turbid and shallow lake was examined. Water and sediments from the lake were collected at two sites. One site near the source of pollution input (Eastern Region) and the second site 40 km from the pollution input (Central Region). The Elutriate Test was used to find the impact of sediment-borne substances. Elutriation of the water for the bioassays was done under aerobic and anaerobic conditions. Two sources of phytoplankton and bacterioplankton were used. One was the native organisms for each sampling site, the other was from the opposite sampling site. The phytoplankton bioassays showed inhibition of growth with increasing concentration of sediments regardless of source of sediments or phytoplankton. The bacterial bioassays showed, in most cases, stimulation of¹⁴C-glucose uptake with the addition of sediments. Bacteria from the more polluted region when grown in less polluted region elutriate did not show any significant change in glucose uptake. When less polluted region bacteria were grown in more polluted region elutriate they showed a highly significant stimulation in uptake.     

Zinc status in plasma of obese individuals during glucose administration

To know whether plasma zinc status is altered under acute hyperglycemic state, the interrelationships among plasma glucose, insulin, and zinc concentrations during oral glucose tolerance test (OGTT) in obese individuals and their lean controls were studied. Plasma glucose and insulin concentrations under fasting as well as those values in response to OGTT were significantly higher in obese individuals than those in lean controls. On the other hand, the obese had lower fasting plasma zinc concentrations compared to lean controls (13.5 vs 18.1 Μmol/L,p < 0.005). Under fasting, plasma zinc concentrations in overall individuals inversely correlated to their body mass index (BMI) (r = -0.516), plasma glucose (r = -0.620), and plasma insulin (r = -0.510). However, there were no significant changes in plasma zinc and copper values during OGTT in both obese individuals and lean controls. This study showed that plasma zinc values had no changes during OGTT in obese individuals. The results also indicated that lower fasting plasma zinc concentrations in obese individuals were not the short-term metabolic result.     

Pathogen-derived resistance provides papaya with effective protection against papaya ringspot virus

Transgenic Carica papaya plants (cv. Sunset, R0 clone 55-1) carrying the coat protein gene of papaya ringspot virus (strain HA 5-1) remained symptomless and ELISA-negative for 24 months after inoculation with Hawaiian strains of papaya ringspot virus under field conditions. Non-transgenic and transgenic control plants lacking the coat protein gene developed disease symptoms within one month after manual inoculation or within four months when natural aphid populations were the inoculum vectors. Mean trunk diameter was significantly greater in cloned 55-1 plants compared with virus-infected controls (14.7 cm versus 9.3 cm after 18 months). Fruit brix, plant morphology, and fertility of 55-1 plants were all normal, and no pleiotropic effects of the coat protein gene were observed. These results indicate that pathogen-derived resistance can provide effective protection against a viral disease over a significant portion of the crop cycle of a perennial species.     

The influence of parental care behaviour on localized nest spacing in smallmouth bass, Micropterus dolomieu

Synopsis I examined the consequence of territorial behaviour on localized nest spacing by male smallmouth bass, Micropterus dolomieu in Jones Bay, Lake Opeongo, Ontario. I compared observed nest spacing to that predicted from (i) territory size and shape measured using sonic tracking procedures; and (ii) 1000 simulated, randomly established nesting stocks. The observed spacing between nests (17.52 ± 1.46 m; mean ± standard error) was not different from that predicted from measurements of territory size and shape (17.60 ± 3.20 m) but was significantly greater than that predicted for randomly established nests (9.53 ± 0.06 m). Parental care-associated territorial behaviour influences the spacing between smallmouth bass nests.     

转PVY外壳蛋白基因马铃薯及其田间实验

报道了将马铃薯Ｙ 病毒（ＰＶＹ）中国分离株的外壳蛋白基因通过农杆菌（Ａｇｒｏｂａｃｔｅｒｉｕｍ ｔｕｍ ｅｆａ－ｃｉｅｎｓ）介导转入马铃薯（Ｓｏｌａｎｕｍ ｔｕｂｅｒｏｓｕｍ Ｌ．）的生产品种“Ｆａｖｏｒｉｔａ”、“虎头”和“克４”,在获得大量再生植株的基础上经过ＰＣＲ检测和Ｓｏｕｔｈｅｒｎ 杂交证明,大部分株系中ＰＶＹ 外壳蛋白基因的表达框架已完整整合到马铃薯的染色体上。人工接种ＰＶＹ 病毒（２０ ｍ ｇ／Ｌ）后一些转基因株系对ＰＶＹ 病毒的侵染表现较强的抗性,同时其单株结薯数和平均薯重有所增加。在田间实验中,转基因马铃薯植株生长良好而且部分转基因株系产量高于未转基因的脱毒马铃薯,从这些株系中有希望得到抗病性好而且高产的马铃薯品系