نتایج جستجو برای: taxonomic structure
تعداد نتایج: 1591884 فیلتر نتایج به سال:
The root microbes play pivotal roles in plant productivity, nutrient uptakes, and disease resistance. The root microbial community structure has been extensively investigated by 16S/18S/ITS amplicons and metagenomic sequencing in crops and model plants. However, the functional associations between root microbes and host plant growth are poorly understood. This work investigates the root bacteri...
Difficulties were encountered in the identification of at gram negative, encapsulated coccobacillus (strain 1297) that prloduced oxidase positive mueoid colonies. Final identification as a mucoid variant of Moraxella non liquefaciens was not achieved until Henriksen's helpful paper was published (1952) and strains were exchanged with him. The peculiarities of structure and arrangement, as well ...
بخش سیناروییدس از جنس کوزینیا (تیره کاسنی ( مورد بازنگری تاکسونومیکی قرار می گیرد.تاکسون های زیر به عنوان تاکسونهای جدید شرح داده می شوند. cousinia shiraziana, c. denaensis, c. lurestanica, c. pasagadensis, c. sahandica, c. gaharensis, c. silvanica, c. arakensis, c. kurdestanica, c. ardalensis. تاکسون های زیر یکبار دیگر در مقایسه با آخرین مطالعه گروه به عنوان تاکسون های مستقل شناخته می شوند. c...
A formal theory of multilevel systems is needed for modelling the outcomes of policy. The dynamics of social systems are coupled between levels and models that do not reflect this are incomplete and a poor basis for policymaking. The structures developed here are necessary for the new kinds of models and computer simulations needed to support policy makers as they tackle the problems of an incr...
A formal theory of multilevel systems is needed for modelling the outcomes of policy. The dynamics of social systems are coupled between levels and models that do not reflect this are incomplete and a poor basis for policymaking. The structures developed here are necessary for the new kinds of models and computer simulations needed to support policy makers as they tackle the problems of an incr...
In a recent paper Warwick & Clarke (1995: Mar Ecol Prog Ser 129:301-305) introduced 2 new measures of community diversity, A and A' These measures dlffer from more conventional d~ver sity indices by incorporating the taxonomic relatedness of species into their calculation. In this paper we compare temporal trends in A and A' with more conventional diversity measures for the demersal fish commun...
Quantifying diversity with phylogeny-informed metrics helps understand the effects of diversity on ecosystem functioning (EF). The sign of these effects remains controversial because phylogenetic diversity and taxonomic identity may interactively influence EF. Positive relationships, traditionally attributed to complementarity effects, seem unimportant in natural soil bacterial communities. Neg...
Metagenomics is revolutionizing our understanding of microbial communities, showing that their structure and composition have profound effects on the ecosystem and in a variety of health and disease conditions. Despite the flourishing of new analysis methods, current approaches based on statistical comparisons between high-level taxonomic classes often fail to identify the microbial taxa that a...
The genus Astragalus L. (Fabaceae) is reviewed from both phyloenetic and taxonomic points of view. As the largest genus of flowering plants it has attracted many researchers, but much work remains to be done. A short taxonomic history with special focus on infrageneric classification of the genus, a list of phylogenetic studies including the applied markers and sampling strategies as well a...
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