云南鲤科鱼类一新属新种(鲤形目:鲤科:(鱼丹)亚科)

本文记述采自云南澜沧江水系的鲤科(鱼丹)亚科鱼类一新属新种。新属裸(鱼丹)属Gymnodanio gen.nov.在侧线、臀鳍条数目等特征上近似于低线(?)属Barilius,但以其除侧线鳞外体裸露无鳞,具不完全之腹棱等而与其及(鱼丹)亚科现有各属相区别。新种命名为条纹裸(鱼丹)G.strigatus sp.nov.。     

大齿大尾溞一新亚种(鳃足纲:双甲目)

本文绘图描述了大齿大尾骚的一新亚种,定名为长毛大尾溞Leydigia macrondonta longiseta subsp.nov.新亚种与其它亚种的主要不同是:后腹部每簇侧刚毛中的3—4根刚毛自前至后趋长,并且都比较长。     

中国三节茧蜂属Acampsis Wesmale记述(膜翅目:茧蜂科:屏腹茧蜂亚科)

三节茧蜂属Acampsis Wesmael是屏腹茧蜂亚科中的1个小属,全世界仅知1种。本文新添在我国发现的2个新种:中华三节茧蜂A.chinensis sp.nov.(陕西)和湖南三节茧蜂A.hunanensis sp.nov.(湖南)。这是本属在我国的首次发现,也是在东洋区的首次报道。     

叶穗香茶菜的二萜成分

从云南省中甸县产叶穗香茶菜[Rabdosia phyllostachys(Diels)Hara]叶中分得1个新二萜化合物,命名为叶穗香茶菜乙素(phyllostachysin B),经各项波谱数据确定,叶穗香茶菜乙素为6β,11β,14β—三羟基-15α-乙酰氧基-对映-贝壳杉-16-烯-20 醛-7-酮。另一个为已知化合物叶穗香茶菜甲素(phyllostachysin A)。     

Cold shock and heat shock: a comparison of the protection generated by brief pretreatment at less severe temperatures

Abstract Brief exposure to low (0^oC) or high (40^oC) temperature elicits a protective response that prevents injury when the flesh fly, Sarcophaga crassipalpis Macquart, is subjected to more severe cold (-10^oC) or heat (45^oC). Both the low and high temperature responses were found in all developmental stages of the fly, but were most pronounced in the pupal and pharate adult stages. The protective responses generated by brief exposure to 0 or 40^oC appear similar in that both result in a rapid acquisition of cold or heat tolerance and a loss of protection after the flies are returned to 25^oC. The protection generated by chilling is obvious within 10 min of exposure to 0^oC while a 30 min exposure to 40^oC is required to induce the high temperature protection. High temperature protects against cold shock injury within a narrow range (around 36^oC) but we have no evidence that low temperature can protect against heat injury. We previously demonstrated that the rapid increase in cold tolerance correlates with concomitant increases in glycerol concentration, but in this study we found no significant elevation in glycerol in heat-shocked flies. Thus the physiological and biochemical bases for the rapid responses to cold and heat appear to be different.     

刺激中缝背核压抑大鼠小脑浦肯野细胞对苔状和爬行纤维传入的反应

本文在麻醉并制动的大鼠上观察了中缝背核(DR)条件刺激对由苔状和爬行纤维传入引起的小脑浦肯野细胞(PC)诱发反应的影响。主要结果有:(1)刺激大脑皮层感觉运动区可以引起苔状和爬行纤维向对侧小脑皮层第Ⅵ和Ⅶ小叶的传入,因而在该小叶上记录到 PC 的诱发简单锋电位(SS)和复杂锋电位(CS)反应,潜伏期分别是8—25和12—30ms。(2)以不影响PC 自发 SS 和 CS 活动的阈下强度刺激 DR,可显著地压抑 PC 对于刺激感觉运动皮层引起的苔状和爬行纤维兴奋所产生的诱发 SS 和 CS 反应,这种压抑作用可持续数百毫秒。(3)DR条件刺激对 PC 的诱发 SS 和 CS 反应的压抑作用可以被静脉注射5-HT 受体阻断剂羟甲丙基甲基麦角酰胺所减弱或阻断。上述结果表明 DR 的5-HT 能纤维传入可以降低苔状和爬行纤维对 PC 的突触作用效力,抑或降低 PC 对突触传入的反应敏感性,提示中缝-小脑5-HT,能纤维传入系统参与了小脑某些重要的神经活动过程。     

无眼金线鲃及其性状演化

无眼金线鲃Sinocyclocheilus anophthalmus是继我国个旧盲条鳅、无眼平鳅、裸腹盲鲃之后发现的第四种盲鱼。与近似种小孔金线鲃相比,该新种侧线鳞较少。由于它长期生活在黑暗的石灰岩溶洞之中,引起某些性状的适应性变异:眼睛消失;体无色素;鳞片退化,感觉器官特别发达。形态比较结果表明,无眼金线鲃是类似小孔金线鲃的祖先进入地下伏流后,适应黑暗环境而形成的一个种,为本属鱼类进化过程中的一个特化分支。     

青海草原毛虫性信息素分泌腺的位置及组织学

青海草原毛虫性信息素分泌腺是一个上皮褶,位于第八、九腹节间的背方节间膜。覆盖分泌腺的表皮表面光滑,无鳞片和毛状突起。表皮可分二层。内表皮较上表皮厚,厚度有变化,深入到V形细胞褶内。V形排列增加了腺细胞的数量,有利于信息素产量的提高,但上表皮面积与细胞顶膜面积的减少,不利于释放,召唤雌蛾腹部末端连续地伸缩可能是一种补偿活动。     

A single wheatgrass chromosome reduces the concentration of barley yellow dwarf virus in wheat

Seedlings of a series of addition or substitution lines of wheat containing different Thinopyrum intermedium chromosomes were inoculated with the PAV and RPV serotypes of barley yellow dwarf virus (BYDV). Reduced virus titres in infected plants were ascribed to a single pair of homoeologous group 7 chromosomes from Th. intermedium in the disomic addition lines L1 and TAF 2. The group 7 chromosome is associated with red pigmentation of coleoptiles, which was also observed in two lines ditelosomic for the α arm of the chromosome. However, when infected with the PAV serotype of BYDV, the ditelosomic lines had normal virus titres and it is concluded that potential determinants of BYDV resistance are located on the β arm of the Group 7 chromosome.     

Polypeptide domains of ADP-ribosyltransferase obtained by digestion with plasmin

Proteolysis by plasmin inactivates bovine ADP-ribosyltransferase; therefore, enzymatic activity depends exclusively on the intact enzyme molecule. The transferase was hydrolyzed by plasmin to four major polypeptides, which were characterized by affinity chromatography and N-terminal sequencing. Based on the cDNA sequence for human ADP-ribosyltransferase enzyme [Uchida, K., Morita, T., Sato, T., Ogura, T., Yamashita, R., Noguchi, S., Suzuki, H., Nyunoya, H., Miwa, M., & Sugimura, T. (1987) Biochem. Biophys. Res. Commun. 148, 617-622], a polypeptide map of the bovine enzyme was constructed by superposing the experimentally determined N-terminal sequences of the isolated polypeptides on the human sequence deduced from its cDNA. Two polypeptides, the N-terminal peptide (Mr 29,000) and the polypeptide adjacent to it (Mr 36,000), exhibited binding affinities toward DNA, whereas the C-terminal peptide (Mr 56,000), which accounts for the rest of the transferase protein, bound to the benzamide-Sepharose affinity matrix, indicating that it contains the NAD+-binding site. The fourth polypeptide (Mr 42,000) represents the C-terminal end of the larger C-terminal fragment (Mr 56,000) and was formed by a single enzymatic cut by plasmin of the polypeptide of Mr 56,000. The polypeptide of Mr 42,000 still retained the NAD+-binding site. The plasmin-catalyzed cleavage of the polypeptide of Mr 56,000-42,000 was greatly accelerated by the specific ligand NAD+. Out of a total of 96 amino acid residues sequenced here, there were only 6 conservative replacements between human and bovine ADP-ribosyltransferase.