CO2激光照射对油菜种子活力指数的数学模拟

本试验采用多项式模拟方法,研究ＣＯ２激光对油菜种子活力指标的影响,分别得出了发芽种子的下胚轴长与ＣＯ２激光照射时间;发芽种子的胚根长与ＣＯ２激光照射时间;种子的发芽指数与ＣＯ２激光照射时间;萌动种子的过氧化氢酶活性与ＣＯ２激光照射时间;地上部鲜重与ＣＯ２激光照射时间;全株鲜重与ＣＯ２激光照射时间的数学模型。揭示了油菜种子活力与ＣＯ２激光照射时间的关系。     

CuBr激光对造血细胞增殖的影响

本文介绍了ＣｕＢｒ激光的功率和照射时间对造血细胞增殖作用的影响,有利于对激光刺激造血细胞增殖机制的认识。造血细胞由ＢＡＬＢ／ｃ鼠的骨髓和胎肝制备而成。在低功率（２０ｍＷ／ｃｍ２）５７８．２ｎｍ激光照射１００秒时,使胎肝造血细胞增殖６．５倍,随照射时间增长,增殖效率将趋向饱和,并略有下降;在定时１２０秒照射时,随５１０．６ｎｍ的激光照射功率增大,激光对骨髓造血细胞的增殖作用变为抑制作用。     

CO2激光照射对青椒、茄子种子及幼苗生长点超弱发光影响的研究

本文利用ＣＯ２激光照射青椒、茄子干种子后,观察刺激剂量、半致死剂量对种子及幼苗生长点超弱发光的影响,从而探索超弱发光是否可作为激光照射后衡量种子活力综合反应的一项指标。其结果表明：１．青椒、茄子干种子超弱发光的动态变化随着照射间隔期的延长,其不同剂量之间超弱发光强度的差异也相应变小,照射时间最长的半致死剂量组２５″、３５″,其超弱发光由最高降为最低;激光刺激剂量组３″、１３″的超弱发光强度始终高于ＣＫ。２．青椒、茄子种子发芽过程中超弱发光表现为激光刺激剂量组均极显著高于ＣＫ;半致死剂量２５″、３５″均极显著低于ＣＫ。３．激光组的活体生长点和提取液的超弱发光均极显著高于ＣＫ;活体生长点的超弱发光低于提取液的超弱发光。     

低强度激光血管内照射对实验性糖尿病兔血液流变性质的影响

本实验用３８只实验性糖尿病兔,分别采用１．２ｍｗ、１．５ｍｗ、２．２ｍｗ×５０分钟三组不同剂量Ｈｅ—Ｎｅ激光,分两批作一次性血管内照射,测定其红细胞变形能力等８项血液流变学指标,并观察指标随时间的变化。结果表明：（１）激光照射后血液粘度降低,红细胞聚集性降低,且在２４小时内就有反映,５—７天仍然有效;（２）能提高红细胞变形能力,以照射后第３天最明显。５—７天后会回复照射前水平。此结果可为低强度激光血管内照射临床应用选择照射频度提供参考（３）可改善红细胞刚度,但时间上反映较迟     

弱激光对脂质体介导的血管平滑肌细胞基因转染的影响

本研究采用阳离子脂质体介导外源基因转染体外培养的兔血管平滑肌细胞（ＳＭＣ）,在基因转染过程中给予激光照射,用细胞化学染色方法测定基因转染阳性率。结果显示：用５１０．６ｎｍ激光于基因转染前,以功率密度１ｍｗ／ｃｍ２,能量密度２、４、６Ｊ／ｃｍ２和５ｍＷ／ｃｍ２,４、６Ｊ／ｃｍ２;及１０ｍＷ／ｃｍ２,２Ｊ／ｃｍ２进行照射均能显著提高基因转染率（ｐ＜０．０５）;于基因转染后即刻以功率密度１ｍＷ／ｃｍ２、能量密度２Ｊ／ｃｍ２和５ｍＷ／ｃｍ２、６Ｊ／ｃｍ２照射也能提高基因转染率（ｐ＜０．０５）。而用６２７．８ｎｍ激光照射对基因转染率无显著影响     

不同波长激光辐照花生种子的生物学效应

本实验考察了Ｋ＋ｒ、Ａｒ＋、Ｎｄ：ＹＡＧ、ＨｅＮｅ和ＬＤ等不同波长的激光辐照对花生种子产生的生物学效应。结果显示,适当剂量不同波长的激光辐照都能促进花生种子生长。在辐照剂量为０．１２８ｗ／ｃｍ２×１８０ｓ的条件下,较短波长激光对花生幼苗的促进作用比长波长激光显著;在辐照剂量为１．２８ｗ／ｃｍ２×１８ｓ的条件下,短波长激光对花生种子的萌发及胚的生长有抑制作用,而长波长激光有促进效应。在相同辐照剂量条件下,不同功率密度与时间的组合其辐照效果不同。１．２８ｗ／ｃｍ２功率密度的Ｎｄ：ＹＡＧ（５３２ｎｍ）激光脉冲输出辐照对花生种子的生长产生显著的抑制作用。实验结果提示,要得到相同的辐照效果,长波长激光与短波长激光相比,必须提高辐照功率密度或加大辐照输出剂量。     

510.6nm激光照射对兔血管平滑肌细胞增殖的影响

本文用５１０．６ｎｍ 波长激光以功率密度１、５、１０ ｍ Ｗ／ｃｍ ２ 和能量密度２、４、６Ｊ／ｃｍ ２ 照射体外培养的兔血管平滑肌细胞（ＳＭＣ）,通过３Ｈ－ ＴｄＲ掺入率和细胞生长曲线测定细胞增殖率。结果显示,上述激光照射量均能抑制细胞增殖率,其中以１０ｍ Ｗ／ｃｍ ２ 组的作用最为显著     

低能量氦氖激光照射对荷瘤小鼠T淋巴细胞增殖反应的影响

目的：本文研究低能量氦氖激光照射荷瘤小鼠,观察对荷瘤Ｔ淋巴细胞增殖反应的影响。结果：ＢＡＬＢ／Ｃ雄性小鼠腹腔接种Ｓ１８０接种后,进行激光照射小鼠内眼角,测定正常对照组、肿瘤对照组和７．３３、１１．００、１４．６７、２２．００Ｊ／ｃｍ＾２和２９．３３Ｊ／ｃｍ＾２五个剂量激光照射组小鼠的Ｔ淋巴细胞增殖反应,结果表明１１．００Ｊ／ｃｍ＾２、１４．６７Ｊ／ｃｍ＾２、２２．００Ｊ／ｃｍ＾２剂量的氦氖激光照射     

杉木与柳杉人工杂交种子发育的软X—射线判断及种子萌发和幼苗生长的 …

进行了杉木属（ＣｕｒｕｎｉｎｇｈａｍｉａＲ．Ｂｒ．）与柳杉属（ＣｒｙｐｔｏｍｅｒｉａＤ．Ｄｏｎ）的属间人工杂交,结果如下：１．从７６个经人工授粉后获得的球果中脱落的种子大量是空瘪的,对我观较饱满的种子６２８粒进行了软Ｘ－射线检查,其中无胚的５９７粒（９５．６％）胚发育不全的１７粒（２．７％）胚发育完全的只有１４粒（２．２％）,２．种子萌发试验表明,经软Ｘ－射线照射判断的,具发育完全的种子可以萌发形     

CO2激光照射对石刁柏种子活力指标的数学模拟

本文在ＣＯ２激光对石刁柏种子活力影响的研究基础上,应用多项式回归对种子活力指标进行了数学模拟。分别得到了发芽种子的胚根长、下胚轴长、发芽率、发芽指数、活力指数、出苗率与ＣＯ２激光照射时间的数学模型。     

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.