榄香烯对急性血瘀模型大鼠血液流变性的影响

本文观察了榄香烯对急性血瘀模型大鼠血液流变性的影响。实验结果表明：榄香烯６．２５－２５ｍｇ／ｋｇ／ｄ,ｉｐ×７ｄ,可使血瘀模型鼠的高低切变率全血粘度和还原粘度、血浆粘度、血沉、红细胞聚集指数、纤维蛋白原及红细胞电泳时间等显著降低（Ｐ＜０．０５、Ｐ＜０．０１）。提示榄香烯有活血化瘀作用     

公雏鸡糖皮质激素受体与免疫功能的相关性

研究了用于不同剂量（７５、５０、２５、１０ｍｇ／ｋｇ）ＲＵ４８６阻断公雏鸡糖皮质激素受体１天或连续３天免疫指标变化情况。ＲＵ４８６７５和５０ｍｇ／ｋｇ阻断ＧＲ２４ｈ,公雏鸡脾淋巴细胞ＩＬ－２、ＩＦＮ诱生活性和Ｔ、Ｂ淋巴细胞增殖活性降低（Ｐ〈０．０１）,外周血淋巴细胞、单核细胞、ＡＮＡＥ＋细胞减少（Ｐ〈０．０１）;胸腺、脾脏、法氏囊的体重比减小（Ｐ〈０．０１）。每日ＲＵ４８６５０ｍｇ／ｋｇ连续３天阻     

一氧化氮/内皮素在大鼠胃粘膜损伤中的作用及电针的调整效应

用酒精灌胃引起大鼠胃粘膜损伤模型,观察内皮衍生因子（ＮＯ／ＥＴ）的含量变化和电针对胃粘膜损伤调整作用,结果发现：酒精灌胃后,胃粘膜血流量（ＧＭＢＦ）、跨壁电位差,血ＮＯ含量降低（Ｐ〈０．０１）,血浆ＥＴ含量和胃粘膜损伤指数（ＬＩ）增高（Ｐ〈０．０１）。Ｌ－精氨酸（Ｌ－Ａｒｇ）或硝普钠（ＳＮＰ）灌注预处理后（ｉｖ）,ＮＯ含量和ＧＭＢＦ明显升高（Ｐ〈０．０１）,ＥＴ含量和ＬＩ指数下降（Ｐ〈０．０１）。     

电刺激膈神经中枢端对家兔动脉血压和血浆血管紧张素Ⅱ及肾神经传出放电的影响

电刺激家兔膈神经中枢端（ＳＣＰＮ）可引起动脉血压下降,此降压反应不能被剪断双侧颈迷走神经或静脉注射阿托品１ｍｇ／ｋｇ所阻断;但可以被静脉注射酚妥拉明２．０ｍｇ／ｋｇ或静脉注射心得安１．５ｍｇ／ｋｇ部分阻断。去除缓冲神经后,其降压反应更明显。降压反应后ｌｍｉｎ血浆血管紧张素Ⅱ水平降低（Ｐ＜０．０５）,肾神经传出放电（ＲＮＤ）减少（Ｐ＜０．０１）,上述结果表明,膈神经的感觉纤维参与血压调节。     

肾上腺素受体拮抗剂对大鼠急性肝损害影响的研究

雄性ＳＤ大鼠３３只,体重１８０—２５０ｇ,随机分成四组。正常对照组６只;哌唑嗪组８只,于实验第１、２、３日上午用哌唑嗪灌胃（１ｍｇ／ｋｇ体重）共３次,第２日下午腹腔注射半乳糖胺（６００ｍｇ／ｋｇ体重）１次,第４日上午处死动物,取肝脏及血清作有关检查;普萘洛尔组及Ｎ．Ｓ对照组分别用普萘洛尔（２ｍｇ／ｋｇ体重）及Ｎ．Ｓ（１０ｍｌ／ｋｇ体重）代替哌唑嗪灌胃,处理程序同哌唑嗪组。结果表明：一、哌唑嗪能显著减轻肝脏病变及血清ＡＬＴ的升高。二、哌唑嗪对肝损害后肝组织ＳＤＨ、Ｍｇ２＋－ＡＴ－Ｐａｓｅ、ＣｈＥ、ＡＣＰ、ＣＣｏ等酶活性的恢复有显著效果。三、哌唑嗪组ＬＰＯ明显低于Ｎ．Ｓ对照组（Ｐ＜０．０１）而ＳＯＤ活性明显高于Ｎ．Ｓ对照组（Ｐ＜０．０１）。普萘洛尔组各项指标同对照组比较均无显著差异（Ｐ＞０．０５）。提示：哌唑嗪对大鼠实验性肝损害有一定的保护作用。     

电刺激膈神经中枢端对家兔动脉血压和血浆血管紧张素Ⅱ…

电刺激家兔膈神经中枢端（ＳＣＰＮ）可引起动脉血压下降,此降压反应不能被剪断双侧颈迷走神经或静脉注射阿托品１ｍｇ／ｋｇ所阻断;但可以被静脉注射酚妥拉明２．０ｍｇ／ｋｇ或静脉注射心得安１．５ｍｇ／ｋｇ部分阻断。去除缓冲神经后,其降压反应更明显。降压反应后１ｍｉｎ血浆血管紧张素Ⅱ水平降低（Ｐ＜０．００５）,肾神经传出放电（ＲＮＤ）减少（Ｐ＜０．０１）,上述结果表明,膈神经的感觉纤维参与血压调节。     

福尔马林致痛后大鼠中脑导水管周围灰质甲啡肽及脊髓背角P物质含量的变化

本文用免疫组化方法结合计算机图像处理技术观察大鼠后脚掌皮下注射福尔马林后脊髓背角Ｐ物质免疫阳性反应（ＳＰＬＩ）变化的节段性分布及中脑导水管周围灰质（ＰＡＧ）内甲啡肽样免疫阳性反应（ＭＥＬＩ）的变化。结果显示,注射福尔马林后,脊髓腰段（Ｌ１－２,Ｌ４－５）背角ＳＰＬＩ显著增强（Ｐ＜．０５）,３０ｍｉｎ组与６０ｍｉｎ组相比较无显著变化（Ｐ＞０．０５）;胸脊髓（Ｔ８）无显著变化（Ｐ＞０．０５）;颈脊髓背角ＳＰＬＩ有增强趋势（０．０５＜Ｐ＜０．１）;ＰＡＧ中ＭＥＬＩ减弱,腹外侧部３０ｍｉｎ组比６０ｍｉｎ组变化更大（Ｐ＜０．０５）。ＰＡＧ中ＭＥＬＩ与脊髓背角ＳＰＬＩ变化的时相关系提示福尔马林致痛引起的脊髓背角Ｐ物质的增多可能与ＰＡＧ中甲啡肽及阿片受体活动有关。     

蛇毒心脏毒素对荷瘤小鼠的抗肿瘤作用初步研究

目的探讨蛇毒心脏毒素（ＣＴＸ）对荷瘤小鼠Ｓ１８０腹水瘤细胞生长抑制的影响。方法小鼠腹腔接种Ｓ１８０活瘤细胞,连续１０ｄ分别腹腔注射ＣＴＸ０．８ｍｇ／ｋｇ、０．４ｍｇ／ｋｇ、０．２ｍｇ／ｋｇ,分析统计荷瘤小鼠的体重变化和癌细胞死亡率,并用有丝分裂完全阻断法分析体内癌细胞的有丝分裂过程。结果ＣＴＸ各剂量组荷瘤小鼠的体重抑制和癌细胞死亡率均有明显的剂量反应关系,与对照组相比有显著的差异（Ｐ＜０．０１）;镜检发现ＣＴＸ能抑制体内癌细胞的有丝分裂,表现在０．４ｍｇ／ｋｇ和０．８ｍｇ／ｋｇ实验组腹水Ｓ１８０细胞处于有丝分裂前期和中期的细胞数量明显减少,其ＭＩ值分别为０．７１％和０．８０％,比对照组显著减少（Ｐ＜０．００１）。结论ＣＴＸ对Ｓ１８０小鼠体内癌细胞的生长有抑制和杀伤作用,并通过干扰和阻断癌细胞的有丝分裂过程,抑制腹水的生长。     

蝮蛇三龙丹胶囊对大鼠实验性脑血肿的影响

目的探讨蝮蛇三龙丹胶囊对大鼠实验性脑血肿的影响。方法采用大鼠自体血液颅内注入造成大鼠脑血肿模型,观察蝮蛇三龙丹胶囊的作用。结果蝮蛇三龙丹胶囊（０．２ｇ／ｋｇ、０．４ｇ／ｋｇ）可明显降低脑指数、脑组织含水量（Ｐ＜０．０１）及Ｃａ２＋离子含量（Ｐ＜０．０１）,对Ｎａ＋、Ｋ＋离子含量无明显影响（Ｐ＜０．０５）。结论蝮蛇三龙丹胶囊对实验性脑血肿诱发脑水肿有一定防治作用,且对小鼠出、凝血时间无影响,亦未见对大鼠实验性脑血肿发生再出血。本实验为蛇毒制剂治疗高血压性脑出血提供可靠依据。关键词蝮蛇三龙丹胶囊脑血肿脑水肿     

Vc稀土对肉兔生长性能影响试验研究

本文研究Ｖｃ稀土对肉兔生长性能的影响。实验结果表明饲料中添加３５ｍｇ／ｋｇ对肉兔有明显增重效果（Ｐ〈０．０１）。其残留量仅为０．２８５ｍｇ／ｋｇ。６０ｍｇ／ｋｇ以下剂量没有引起肉兔体内组织病变。Ｖｃ稀土在肉兔体内以骨骼分布为主,其次是分布国胃、肺、脾、肝、肠等组织器官,而在肌肉、心脏组织中含量非常低。     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.