共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
豚池是豚类动物饲养的基本条件,建设符合豚类动物生活,生长和繁殖所必需的饲养设施,是豚类饲养成败的关键之一。作者通过12年来白鱀豚Lipotes vexillifer饲养实践的总结,并实地考察了美、英、日、德国、法国、荷兰、瑞士和香港等国家和地区的豚类饲养设施,结合我国国情,设计了白暨豚饲养繁殖系统——新白鱀豚馆,为我国豚类养殖事业的发展打下了基础1-3。
相似文献
3.
4.
<正>2005年7月5日.人工饲养条件下第一头江豚在武汉白鱀豚馆繁殖成功。除了就地保护和迁地保护之外,建立一定规模的饲养群体并开展人工繁殖研究是保护长江江豚这一濒危物种的另外一种重要保护策略。自1996年开始.中国科学院水生生物研究所白鱀豚馆先后从长江石首、嘉鱼和城陵矶江段引入3头江豚(2雌1雄)并取得 相似文献
5.
6.
7.
8.
白鱀豚饲养池水质状况的研究 总被引:5,自引:2,他引:3
白鱀豚是我国特有的稀珍水生哺乳动物。仅分布于长江的中、下游干流之中。关于如何饲养白鱀豚没有可借鉴的资料。在没有水净化装置和流水系统的条件下,为了既能节省人力和财力,又能保证豚体的健康,我们对白鱀豚饲养池的理化和微生物因子进行了系统、全面的测定和研究。
相似文献
9.
川金丝猴(Rhinopithecus roxellanae roxellanae)是我国的珍稀动物,由于其生性胆怯、体质娇弱,在动物园的环境和人工饲养条件下繁殖成活有一定困难。北京动物园自1986年开始对川金丝猴的繁殖生物学进行研究.1991年5月20日第一只人工饲养下的川金丝猴子二代(雄性)顺利出 相似文献
10.
黑线姬鼠的人工繁殖与驯化 总被引:1,自引:0,他引:1
野生黑线姬鼠是一种良好的EHF病毒动物模型。国内外未见有人工饲养繁殖和驯化方面的报道。我们从1983年起,对野外捕获的6只黑线姬鼠(雌雄各半),在常规饲养室条件下进行人工饲养繁殖和驯化的研究,取得了初步结果。现报告如下。 相似文献
11.
12.
13.
14.
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. 相似文献
15.
16.
RICHARD E. NORRIS 《Botanical journal of the Linnean Society. Linnean Society of London》1991,106(1):1-40
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. 相似文献
17.
JOAN VALUÈS MONTSERRAT TORRELL NÚRIA GARCIA JACAS 《Botanical journal of the Linnean Society. Linnean Society of London》2001,137(4):399-407
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. 相似文献
18.
肝癌中HBV和HCV基因和抗原的分布及意义 总被引:1,自引:0,他引:1
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 相似文献
19.
20.
H.-R. GREGORIUS 《Biological journal of the Linnean Society. Linnean Society of London》1984,23(2-3):157-165
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. 相似文献
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. 相似文献