In order to evaluate the five species groups of Chinese Amolops based on morphological characteristics, and to clarify the phylogenetic position of the concave-eared torrent frog Amolops tormotus, we investigated the phylogeny of Amolops by maximum parsimony, Bayesian Inference, and maximum likelihood methods using two mitochondrial DNA fragments (12S rRNA, 16S rRNA). Our results supported a si...

Abstract The superfamily Buccinoidea is distributed across the oceans of world from Arctic Ocean to Antarctic and intertidal abyssal depths. It encompasses 3351 recent species in 337 genera. latest taxonomic account recognized eight full families. For first time, monophyly relationships among families are tested with molecular data supplemented by anatomical radula data. Five genetic markers we...

Mycoplasmas are very small bacteria lacking cell walls that belong to various genera within the class Mollicutes, and also the smallest organisms that can live independently. They are able to cause serious and chronic disease because of some unique characteristics. Mycoplasma gallisepticum (MG) is an important avian pathogen causing significant economical losses within the poultry industry. The...

Analysis of 16S rRNA gene sequences has become the primary method for determining prokaryotic phylogeny. Phylogeny is currently the basis for prokaryotic systematics. Therefore, the validity of 16S rRNA gene-based phylogenetic analyses is of fundamental importance for prokaryotic systematics. Discrepancies between 16S rRNA gene analyses and DNA-DNA hybridization and phenotypic analyses have bee...

in this research the effects of crude oil on morphological and physiological characterization ofthe cyanobacterium microchaete tenera isc13 were investigated. isolated cyanobacterium treated with different oil concentrations (control, 1, 2.5, 5 and 7%) in carbonless bg110 medium. morphological characteristics such as morphology of filament, cellular shapes and sizes, relative position of hetero...

A mutant of E. coli, isolated by Kindler and Hofschneider as a strain defective in RNase III activity, forms a 30S precursor of ribosomal RNA ("30S pre-rRNA"). The half-life of the 30S pre-rRNA in growing cells at 30 degrees , estimated by the rate of specific (3)[H]uridine incorporation, is about 1 min. In rifampicin-treated cells, the RNA is metabolized to mature rRNA with a half-life of abou...