نتایج جستجو برای: gene diversity

تعداد نتایج: 1302020  

2017
Hosein Azarbonyad Mostafa Dehghani Tom Kenter Maarten Marx Jaap Kamps Maarten de Rijke

A high degree of topical diversity is often considered to be an important characteristic of interesting text documents. A recent proposal for measuring topical diversity identifies three elements for assessing diversity: words, topics, and documents as collections of words. Topic models play a central role in this approach. Using standard topic models for measuring diversity of documents is sub...

2015
Jari Oksanen

This document explains diversity related methods in vegan. The methods are briefly described, and the equations used them are given often in more detail than in their help pages. The methods discussed include common diversity indices and rarefaction, families of diversity indices, species abundance models, species accumulation models and beta diversity, extrapolated richness and probability of ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده علوم پزشکی 1391

مطالعات انجام شده روی مکانیسمهای تکوینی و تکاملی گلبولهای قرمز منجر به دستیابی بشر به مفاهیم پایه و مهمی در ارتباط با مکانیسمهای عمومی تنظیم بیان ژن وشکل گیری بافتها شده است. تمایز اختصاصی به رده ارتیروئید و هر رده دیگری، شدیداً وابسته به تنظیم در سطح بیان ژن و فاکتورهای کنترلی خاص نظیر سیتوکین ها، فاکتورهای نسخه برداری ویژه، عناصر کنترل کننده چرخه سلولی، تکثیر،آپوپتوز و عناصر سیگنالینگ داخل سلو...

Journal: :پژوهش های تولید گیاهی 0
احد یامچی عضو هیات علمی دانشگاه علوم کشاورزی و منابع طبیعی گرگان

background and objectives:medicinal plants, today it is one of the most important agricultural products. progress in the field of medicinal plants is one of the most important goals at the moment is the agricultural sector. although medicinal plants in our country has been very little attention, but the increasing importance of these plants around the world, today, has attracted the attention o...

Fatemeh Keshavarzi, Pezhman Karami, Shoaleh Mirzaei,

Background and Objective: Helicobacter Pylori (H. pylori) is one of the reasons for the gastric inflammation and peptic ulcers. It is a predisposing factor of gastric adenocarcinoma. Cytotoxin A encoded by the cagA gene is one of the major virulence factors in bacterial pathogenicity, which is of special importance due to genetic diversity in different geographical areas. The purpose of this st...

Journal: :گوارش 0
saeid latifinavid farideh siavoshi hafez fakheri afsaneh sharifian hossein nobakht ramin tavafzadeh

background:â there is a relationship between specific genotypes of helicobacter pylori caga and vaca genes and the increased risk of peptic ulcer diseases and gastric cancer. these genes also possess strong patterns of geographical differentiation. the present study aims to determine the patterns of variation of the virulence genes in iran and their association with clinical status. materials a...

2006
Xiao-Dong Yu Tian-Hong Luo

Habitat distribution and seasonal occurrence of carabid beetles were determined using pitfall traps in 1999 and 2000 in the temperate forest zone of the Dongling Mountain, North China. Eight sites differing in vegetation and moisture were selected so as to represent four habitat types. Carabid assemblages of the six forested habitats (lowland, upland and coppice) were more similar to each other...

2016
Christophe Lambiel Mario Kummert Emmanuel Reynard

This paper presents a geomorphological map of the Hérens valley in the Western Swiss Alps. With an area of 270 km and altitudes ranging from 470 to 4357 m a.s.l., this valley is one of the main secondary catchments of the Upper Rhône valley. The high differences in altitudes, combined with a varied geology, create an important geomorphic diversity. The main processes active in mountain areas, t...

2018
Benjamin E. Wolfe

As troves of microbiome sequencing data provide improved resolution of patterns of microbial diversity, new approaches are needed to understand what controls these patterns. Many microbial ecologists are using cultivated model microbial communities to address this challenge. These systems provide opportunities to identify drivers of microbiome assembly, but key challenges and limitations need t...

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