نتایج جستجو برای: ctenophora
تعداد نتایج: 318 فیلتر نتایج به سال:
In a recent paper published in Molecular Phylogenetcs and Evolution, Giribet and Ribera (1998) placed rthropods within the Animal kingdom by analyzing he 18S rDNA locus of 133 metazoan taxa. The goal of hat paper was twofold: (1) to investigate the position of he Arthropoda within the protostome animals and (2) o determine arthropod sister-group relationships. Seuence data were analyzed by mean...
The gel-forming mucins are large glycosylated proteins that are essential components of the mucus layers covering epithelial cells. Using novel methods of identifying mucins based on profile hidden Markov models, we have found a large number of such proteins in Metazoa, aiding in their classification and allowing evolutionary studies. Most vertebrates have 5-6 gel-forming mucin genes and the ge...
Over 95% of all metazoan (animal) species comprise the "invertebrates," but very few genomes from these organisms have been sequenced. We have, therefore, formed a "Global Invertebrate Genomics Alliance" (GIGA). Our intent is to build a collaborative network of diverse scientists to tackle major challenges (e.g., species selection, sample collection and storage, sequence assembly, annotation, a...
This paper aimed to investigate the fishery and biological characteristics of anchovy Kilka in Iranian waters of the Caspian Sea from 2005-2007, including length and age structure ,Von Bertalanffy growth parameters, length and age at first capture, condition factor, sex ratio, natural and fishing mortality. The examination of catch data approved that Kilka population in the Caspian Sea have b...
Animal mitochondrial DNA (mtDNA) is commonly described as a small, circular molecule that is conserved in size, gene content, and organization. Data collected in the last decade have challenged this view by revealing considerable diversity in animal mitochondrial genome organization. Much of this diversity has been found in nonbilaterian animals (phyla Cnidaria, Ctenophora, Placozoa, and Porife...
The evolution of mitochondrial information processing pathways, including replication, transcription and translation, is characterized by the gradual replacement of mitochondrial-encoded proteins with nuclear-encoded counterparts of diverse evolutionary origins. Although the ancestral enzymes involved in mitochondrial transcription and replication have been replaced early in eukaryotic evolutio...
The germline definition in metazoans was first based on few bilaterian models. As a result, gene function interpretations were often based on phenotypes observed in those models and led to the definition of a set of genes, considered as specific of the germline, named the "germline core". However, some of these genes were shown to also be involved in somatic stem cells, thus leading to the noti...
Data from theHelgolandRoads time series and from two series of quasi-synoptical zooplankton surveys in 1979 and 1984 were analysed with respect to recurrent patterns of dynamics of the dinoflagellate Noctiluca scintillans. Based on a Lotka–Volterra model, the patterns were interpreted in terms of potential interactions. The work was conducted as a comparative analysis consisting of spatial, tem...
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