نتایج جستجو برای: pterophyllum scalare
تعداد نتایج: 181 فیلتر نتایج به سال:
We have investigated the structural polarity of microtubules from several systems in which these fibers are thought to contribute to cell motility. By using a method for displaying microtubule polarity in the electron microscope, we find that both the A and B subfibers of Tetrahymena ciliary outer doublets and the inner pair of single microtubules are all oriented with their plus ends (i.e., th...
معدن زغالسنگ یورت شرقی در جنوب خاور آزادشهر در استان گلستان قرار دارد. این معدن دربردارنده یک افق گیاهی شامل 19 گونه ماکروفسیل گیاهی متعلق به 13 جنس از راسته اکوئیستالها، فیلیکالها، بنتیتالها، سیکادالها، گینکگوآلها و کنیفرآلهاست. با توجه به گونههای شاخصی همچون Pterophyllum bavieri، Pterophyllum nathorsti و Baiera muensteriana سن تریاس بالایی (رتین) برای این م...
Heroini constitute the second largest tribe of Neotropical cichlids and show their greatest diversity in Mesoamerica. Although heroine species are morphologically and ecologically very diverse, they were all historically assigned to one single genus, Cichlasoma that was never formally revised from a phylogenetic point of view. Here, we present the most comprehensive molecular phylogeny of the t...
We tested the effect of social isolation on the aggressiveness of an Amazonian fish: Astronotus ocellatus. Ten juvenile fishes were transferred from a group aquarium (60 x 60 x 40 cm) containing 15 individuals (without distinguishing sex) to an isolation aquarium (50 x 40 x 40 cm). Aggressiveness was tested by means of attacks on and displays toward the mirror image. The behavior was video-reco...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید