B itte r an d Sw e e t /Um am i Ta s te Re c ep to rs w ith D iffe ren tly Evo lu tio n a ry Pa thw ays

通过生物信息学和系统发育学分析,研究了苦味受体和甜味/鲜味受体的进化途径。结果显示,苦味受体 和甜味/鲜味受体在进化上具有远相关,并且具有不同的进化途径,提示这可能是导致这些受体具有不同功能,传 导不同味觉的原因。

Mitochondrial genomes of two luminous beetles, Rhagophthalmus lufengensis and R-ohbai (Arthropoda, Insecta, Coleoptera)

We determined the mitochondrial MA (mtDNA) sequences of two luminous beetles (Arthropoda, Insecta, Coleoptera), Rhagophthalmus lufengensis from Yunnan, China and Rhagophthalmus ohbai from Yaeyama Island, Japan. We identified all the 37 mtDNA genes of R. l

COMPARISON OF MASTICATORY MORPHOLOGY BETWEEN RHINOPITHECUS-BIETI AND R-ROXELLANA

The masticatory apparatus for two endemic species of golden monkey in China, Rhinopithecus bieti and Rhinopithecus roxellana, were compared with those of macaques, Macaca and leaf monkeys, Presbytis. Multivariate analyses demonstrated that the two golden monkey species are distinct. Interspecies allometric analyses revealed that golden monkeys differ in their masticatory apparatus from both macaques and leaf monkeys. The prominent symphysial fusion, corpus, and sagittal condylar dimension of R. roxellana may produce efficient biting force on the incisal and posterior canine teeth, with the heavy reaction force barn on the temporomandibular joint. However, the well-developed bizygamatic width and mandibular height in R. bieti suggest that posterior canine function is similarly prominent in R. roxellana, while incisal function is not. (C) 1995 Wiley-Liss, Inc.

鱼类病原菌中R~+质粒的检出及其特性

本文研究了5个属的15株鱼类病原菌对17种抗菌药物的耐药性。其中，对β-内酰胺类和红霉素的耐药率最高，对妥布霉素最敏感。以E．coliK-12RC85为受体菌，鱼类病原菌为供体菌，采用细菌接合试验，从耐氨苄青霉素、四环素和磺胺的嗜水气单胞菌CJ26株中检测到一株耐四环素和磺胺的可自身传递的R质粒pWH9601。它对四环素的抗性可被四环素类药物所诱导。pWH9601上的耐药基因在供体菌和受体菌中的表达水平有所不同。该质粒可在37℃下，15min内通过接合方式，转移到E．coliK－12RC85中，而且这种转