灵长类中的长臂猿仅有一属Hylobates 4个亚属,其中Nomascus亚属曾被认为仅有一个种即黑冠长臂猿Hylobates (Nomascus) concoler,且分化有6个亚种,Hylobates concolor concolor;H.concolorsiki; H. concolor lu; H. concolor hainanus;H. concolor leucogenys;和H. concolor gabriellae。 Dao Van Tien (1983)发现concolor和leucogenys在越南北部为同域分布,认为可能系两个种。马世来和王应祥(1986)也发现它们在中国云南南部也有同域分布现象,且在阴茎骨形态和另外一些形态特征上存在明显差异,从而正式提出它们确系两个有效种,并描记了黑冠长臂猿H. concolor的两个新亚种:H. c. jingdongensis (分布于中国云南中部景东无量山区),H. c. furvogaster (分布于中国云南西南部澜沧江以西)。本文进一步查对了欧、亚和北美各主要博物馆中所保存的长臂猿标本。经分析比较,对Nomascus亚属的长臂猿进行了重新整理如下: 1.进一步比较了黑冠长臂猿H. concolor和白颊长臂猿H. leucogenys在毛色、头骨、牙齿和阴茎骨等特征上的差异,证实它们为两个独立的种是正确的。 2.根据阴茎骨、毛被、牙齿以及杂种核型的形态特征,认为H. gabrielloe应作为本亚属的第3个独立种,siki 为它的地理亚种即:H. gabriellae sike。 3.在H. c 相似文献
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
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
Microbial resistance to antibiotics is an unresolved global concern, which needs urgent and coordinated action. One of the guidelines of the Centers for Disease Control and Preventions (CDC) to combat antibiotic resistance is the development of new antibiotics to treat drug-resistant bacteria. In our effort to find new antibiotics, we report the synthesis and antimicrobial studies of 30 new pyrazole derivatives. These novel molecules have been synthesized by using readily available starting materials and benign reaction conditions. Some of these molecules have shown activity with MIC values as low as 0.78?µg/mL against four bacterial strains; Staphylococcus aureus, methicillin-resistant S. aureus, Bacillus subtilis, and Acinetobacter baumannii. Furthermore, active molecules are non-toxic to mammalian cell line.相似文献
