黑龙江饶河东安镇侏罗-白垩系界线及Buchia新知

一、前言我国东北地区侏罗、白垩纪地层广泛发育,但绝大部分为陆相地层。1958年,黑龙江省地质局徐衍强等,于虎林县龙爪沟地区首次发现含菊石的海相层料,经王义刚等研究,时代属中侏罗世巴通期(Bathonian)(王义刚,1983,100页)。七十年代后期,张弥曼等报道了松辽盆地吉林前郭、农安等地嫩江组合Sungarichthys longicephalus Takai等半咸水海湾相地层的发现,认为时代属晚白垩世早、中期(张弥曼、刘智成,1977;张弥曼、周家健、刘智成,1977);熊宪政等(1976)于黑龙江穆棱下城子、伊林两地     

家兔中脑导水管周围灰质中注射八肽胆囊收缩素（CCK—8）拮抗吗啡镇痛和...

We have reported that intracerebroventricular (i. c. v.) injection of 1-4 ng of CCK-8 to the rat produced a remarkable antagonistic effect on morphine analgesia. In order to study the species specificity and the site of action, CCK-8 was microinjected into the PAG of the rabbit, and its influence on morphine analgesia and electroacupuncture analgesia was observed. The latency of the escape response (ERL) to radiant heat focused on the snout was measured as an index of the pain threshold. Microinjections were made via cannulae chronically implanted into the PAG. The drug solutions were delivered in a volume of 1 microliter, at a speed of 0.125 microliter/min. The ERL was measured for a period of 60 or 70 minutes at 10 min intervals. 1. CCK-8 administered unilaterally to the PAG of the rabbit at a dose of 3 ng antagonized the analgesia induced by morphine (4 mg/kg, i. v.) by 73% (P less than 0.001), and reduced the analgesic effect of electroacupuncture by 67% (P less than 0.001). These effects were dose-dependent within the range from 1.5 ng to 6.0 ng. The effect of CCK-8 was reversed by CCK receptor blocker proglumide (4 microliters, intra-PAG injection). Unsulfated CCK-8 (CCK-us) had no effect in this regard. These results indicate that in the PAG of the rabbit, exogenously administered CCK-8 was capable of antagonizing opioid analgesia by the activation of CCK receptors. 2. Two groups of rabbits were given with morphine (2 mg/kg, i. v.) and simultaneous injection of CCK-8 antiserum (CCK-AS, 1 microliter) or normal rabbit serum (NRS) into the PAG.(ABSTRACT TRUNCATED AT 250 WORDS)     

组胺H2受体拮抗剂对骨髓造血重建的影响

用组胺H_2受体拮抗剂(甲氰咪胍或呋喃硝胺)处理正常和亚致死量γ-射线照射小鼠,探讨正常体内造血和再生骨髓中造血重建与组胺受体的关系。发现非毒性剂量的甲氰咪胍对正常小鼠骨髓多能造血干细胞(CFU-s)无抑制作用,但可抑制小鼠体内粒单系祖细胞(CFU-GM)的生长和亚致死量照射后CFU-s产率的恢复。组胺可能与骨髓的再生有关,组胺H_2受体拮抗剂可抑制骨髓的造血重建。     

薄膜氧电极测定光合作用的HCO3^—浓度问题

氧电极法是一种简单方便的测氧技术,可用以测定光合强度。我们在用氧电极研究植物光合作用时,发现目前采用的HCO_3~-浓度都偏高。本文试讨论用氧电极测定植物叶圆片光合作用时的适宜HCO_3~-浓度问题。目前用氧电极测定光合作用所用的HCO_3~-浓度一般为20mmol/L,亦有用1mmol/L,15mmol/L或100mmol/     

用双向Southern转移-杂交法进行克隆的基因分析

用双向Southern转移和分子杂交方法,分析证明了SRSV有关的克隆pSF11插入子含有LTR结构、非编码区、gag基因和部分env基因。并讨论了该方法的优缺点。     

饲料及其蛋白源有效赖氨酸测定方法的改进

本文在现有国际标准方法的基础上,重点研究了某些可能影响方法准确性、精密度及实验效率的实验条件,并从目前我国多数实验室的实际装备情况出发提出了一个等效,较为实用和简捷的流水线法。