نتایج جستجو برای: taxonomic groups

تعداد نتایج: 751952  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده علوم 1375

the thesis has been arranged into five chapters and mainly concerned with the baer-invariant of groups which is the generalization of the schur-multiplier with respect to the variety of groups. chapter one is devoted to collect some notation and background information which are needed in the next chapters. its also contains some important statements which will be generalized in this thesis. cha...

2009
P. E. Brewin D. B. Haidvogel C. Condit A. Gupta

Using global physical and biological datasets, we tested oceanographic retention (factoring out effects of seamount depth and age) as one possible mechanism structuring seamount benthic decapod and gastropod communities. We first determined the relative oceanographic retentive potential (such as from Taylor caps or columns) for individual seamounts based on steady-state theory. This was then se...

2015
Savvas Genitsaris Sebastien Monchy Jeremie Denonfoux Stephanie Ferreira Konstantinos Ar. Kormas Telesphore Sime-Ngando Eric Viscogliosi Urania Christaki

The microbial taxonomic composition of the three domains of life in two coastal plankton samples was assessed by random total community metagenomic sequencing and PCR-based rDNA amplicon deep-sequencing in order to compare the resulting diversity and investigate possible limitations and complementarities of each method. The various universal primer sets, used to amplify different hypervariable ...

2016
Rachel Collin Suzanne Fredericq D. Wilson Freshwater Edward Gilbert Maycol Madrid Svetlana Maslakova Maria Pia Miglietta Rosana M. Rocha Estefanía Rodríguez Robert W. Thacker

BACKGROUND Correctly identifying organisms is key to most biological research, and is especially critical in areas of biodiversity and conservation. Yet it remains one of the greatest challenges when studying all but the few well-established model systems. The challenge is in part due to the fact that most species have yet to be described, vanishing taxonomic expertise and the relative inaccess...

The paper is focused on classes of lexical units which arise as a result of derivational processes – word formation and semantic transfers, acting either in isolation or together, on the basis of common semantic foundations that bind targets and sources of derivation. The lexical items which constitute the classes under study vary in their denotative characteristics and due to their categ...

Journal: :Systematic biology 2007
H C J Godfray B R Clark I J Kitching S J Mayo M J Scoble

An easily accessible taxonomic knowledge base is critically important for all biodiversity-related sciences. At present, taxonomic information is organized and regulated by a system of rules and conventions that date back to the introduction of binomial nomenclature by Linnaeus. The taxonomy of any particular group of organisms comprises the sum information in the taxonomic literature, supporte...

2007
Kaustuv Roy

-The mid-Mesozoic time was characterized by massive reorganization of the ecological structure of benthic marine communities. Although the general pattern of this "Mesozoic Marine Revolution" has been extensively documented, little is known about how it affected the taxonomic and morphologic diversities of individual lineages of organisms. Here I document group-level dynamics of the Mesozoic ch...

2010
WEN-SEN LEE

The practical methodologies of stable pattern classification using artificial intelligence as advisory tools are researched here according to studies in the flowering plant genera Lithops N.E. Br. (Aizoaceae). In this paper, the use of K-means model is a practical generation of groups as a classifier for botanical taxa. In order to provide comparisons for this study of effective classification ...

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