نتایج جستجو برای: essential science indicator
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2 Kelchner, S.A. and Thomas, M.A. (2007) Model use in phylogenetics: nine key questions. Trends Ecol. Evol. 22, 87–94 3 Posada, D. and Crandall, K. (1998) Model test: testing the model of DNA substitution. Bioinformatics 14, 817–818 4 Goldman, N. (1993) Statistical tests of models of DNA substitution. J. Mol. Evol. 36, 182–198 5 Bollback, J.P. (2002) Bayesian model adequacy and choice in phylog...
Introduction It is widely presumed that international collaboration benefits the researchers and the organisations involved, and enhances the quality of research (Persson, 2010). However, research also suggests that the effects of international collaboration may vary across disciplines and the authors’ countries (Moed, 2005). In this study, we investigated the effect of international collaborat...
this research was conducted in two protect and destroy region in the middle zagros, in illam province. in order to identification of ecological species group and evaluate density of regeneration, effect of many factors such as protection, vegetation, physiographic factors, physical and chemical properties of soil in study locations were studied. to achieve these purpose number of 54 plots using...
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