نتایج جستجو برای: biologic evolution
تعداد نتایج: 398599 فیلتر نتایج به سال:
a Department of Physics, University of California, Berkeley, 366 LeConte Hall, Berkeley, CA 94720 b University of Alabama at Birmingham, 1300 University Blvd CH464, Birmingham, AL 35294 c BEACON Center for the Study of Evolution in Action, Michigan State University, 567 Wilson Road 1441, East Lansing, MI 48824 d Department of Microbiology, Nash Hall 220, Oregon State University, Corvallis, OR 9...
In recent decades, a growing number of studies have addressed connections between ecological and evolutionary concepts in biologic invasions. These connections may be crucial for understanding the processes underlying invaders' success. However, the extent to which scientists have worked on the integration of the ecology and evolution of invasive plants is poorly documented, as few attempts hav...
Galaxy luminosity evolution: how much is due to a model choice? Abstract. The cluster and field luminosity functions (LFs) determined on large homogeneous samples (N > 2200 galaxies each) are almost indistinguishable, down to M * + 4 in the r and i filters, hence suggesting that the effect of the cluster environment on the galaxy properties does not affect the galaxy luminosity function in red ...
Pathogens that consist of multiple antigenic variants are a serious public health concern. These infections, which include dengue virus, influenza and malaria, generate substantial morbidity and mortality. However, there are considerable theoretical challenges involved in modelling such infections. As well as describing the interaction between strains that occurs as a result cross-immunity and ...
A fluid of domain walls may have an effective equation of state pw = − 23ρw. This equation of state is qualitatively in agreement with the supernova type Ia observations. We exploit a cosmological model where the matter content is given by a dust fluid and a domain wall fluid. The process of formation of galaxies is essentially preserved. On the other hand, the behaviour of the density contrast...
Homologs of the CYC/TB1 gene family have been independently recruited many times across the eudicots to control aspects of floral symmetry The family Asteraceae exhibits the largest known diversification in this gene paralog family accompanied by a parallel morphological floral richness in its specialized head-like inflorescence. In Asteraceae, whether or not CYC/TB1 gene floral symmetry functi...
Advanced approaches to preparing non-noble-metal electrocatalysts for the hydrogen evolution reaction (HER) are considered to be a significant breakthrough in promoting the exploration of renewable resources. In this work, a hybrid material of MoS2 nanoflowers (NFs) on reduced graphene oxide (rGO) was synthesized as a HER catalyst via an environmentally friendly, efficient approach that is also...
The Australian Drosophila Ecology and Evolution Resource (ADEER) collates Australian datasets on drosophilid flies, which are aimed at investigating questions around climate adaptation, species distribution limits and population genetics. Australian drosophilid species are diverse in climatic tolerance, geographic distribution and behaviour. Many species are restricted to the tropics, a few are...
Contrast reversal of the eyes impairs infants' face processing: a near-infrared spectroscopic study.
Human can easily detect other's eyes and gaze from early in life. Such sensitivity is supported by the contrast polarity of human eyes, which have a white sclera contrasting with the darker colored iris (Kobayashi & Kohshima, (1997). Nature, 387, 767-768; Kobayashi & Kohshima, (2001). Journal of Human Evolution, 40, 419-435). Recent studies suggest that the contrast polarity around the eyes pla...
We review the main sources of LiBeB production and show that a primary mechanism is at work in the early Galaxy involving both ejection and acceleration of He, C and O at moderate energy, which by nuclear interaction with H and He produce light isotopes. The precise measurement of the Be abundance at [Fe/H] = -3.3 and of Li in halo stars find an explanation in this framework. Thus, the preserva...
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