نتایج جستجو برای: genetic heterogeneity

تعداد نتایج: 694501  

Journal: :Ecology 2006
Andrew S MacDougall Roy Turkington

Diversity is a balance between processes that add and limit species (e.g., dispersal vs. competition), but reconciling their contributions remains a challenge. Recruit-ment-based models predict that dispersal barriers are most limiting for diversity, while competition-based models predict that dispersal matters only when competition is minimized. Testing these models is difficult because their ...

Journal: :Collegium antropologicum 2003
Helga Jovanović Zivka Prebeg Ivana Stanić Gorka Vuletić

The objective of this paper is to present the growth patterns of school children in Osijek--the city which was exposed to severe attacks during the aggression on Croatia. The mean height and weight of Osijek schoolchildren aged 7 to 18 and the menarcheal age in girls in academic year 1995/96 were compared to the analogous data collected in 1980/81. The secular changes in height were heterogeneo...

2013
Zhengtang Qi Xiaofeng Zhai Shuzhe Ding

During endurance and resistance exercise training, AMPK and mTOR signaling were known as selective pathways implicating the differentiation of exercise-induced phenotype in skeletal muscle. Among the previous studies, however, the differences in exercise protocol, the individuality and the genetic heterogeneity within species make it difficult to reach a consistent conclusion in the roles of AM...

Journal: :The American naturalist 2014
Julie A Meachen Trina E Roberts

A basic ecological tenet is that organisms in a community occupy different niches and have different traits, but how consistently competition, selection, and phylogenetic effects structure communities remains uncertain. Are all communities created equal? We examine how mammalian carnivoran communities are assembled with regard to mass, diet, and locomotion. Here, we use a multivariate nearest-n...

2007
Sundé M. Nesbit Judith C. Conger Anthony J. Conger

The aim of this paper was to evaluate the relationship between anger and aggressive driving. It was hypothesized that: 1) there is a significant positive relationship between anger and aggressive driving; 2) this relationship systematically differs based on whether anger is trait-based, state/mood-based, or situation-specific; 3) this relationship also varies depending on the mode of measuremen...

Journal: :Social science research 2011
Shu-Ling Tsai Yu Xie

The causal impact of higher education on earnings may be heterogeneous across different members of a population. Using a newly developed instrumental-variable method in economics, we illustrate heterogeneous treatment effects of higher education on earnings resulting from sorting mechanisms that select individuals with certain unobserved attributes into college education. The setting of our emp...

2013
Jani Heino

Both environmental heterogeneity and mode of dispersal may affect species co-occurrence in metacommunities. Aquatic invertebrates were sampled in 20-30 streams in each of three drainage basins, differing considerably in environmental heterogeneity. Each drainage basin was further divided into two equally sized sets of sites, again differing profoundly in environmental heterogeneity. Benthic inv...

Journal: :Physical biology 2018
Nash D Rochman Dan M Popescu Sean X Sun

Many single-cell observables are highly heterogeneous. A part of this heterogeneity stems from age-related phenomena: the fact that there is a nonuniform distribution of cells with different ages. This has led to a renewed interest in analytic methodologies including use of the 'von Foerster equation' for predicting population growth and cell age distributions. Here we discuss how some of the m...

Journal: :Statistical methods in medical research 2017
Olivier Bouaziz Grégory Nuel

In this article, we suggest a new statistical approach considering survival heterogeneity as a breakpoint model in an ordered sequence of time-to-event variables. The survival responses need to be ordered according to a numerical covariate. Our estimation method will aim at detecting heterogeneity that could arise through the ordering covariate. We formally introduce our model as a constrained ...

Journal: :Geospatial health 2012
Zhi-Jie Zhang Rong Zhu Robert Bergquist Dong-Mei Chen Yue Chen Li-Juan Zhang Jia-Gang Guo Fei Zhao Qing-Wu Jiang

The long-term effectiveness of the mainly chemotherapy-based control strategy of the World Bank Loan Project (WBLP) for schistosomiasis control in Chinese hilly and mountainous regions was evaluated with a view to determine the best road forward. Based on the national database of schistosomiasis prevalence for the periods of 1999-2001 and 2007-2008 in the People's Republic of China, a Bayesian ...

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