نتایج جستجو برای: cenchrus ciliaris
تعداد نتایج: 466 فیلتر نتایج به سال:
It is important for conservation biologists to understand how well species persist in human-dominated ecosystems because protected areas constitute a small fraction of the Earth's surface and because anthropogenic habitats may offer more opportunities for conservation than has been previously thought. We investigated how an important functional group, pollinators (bees; Hymenoptera: Apiformes),...
M. M. Qazilbash,1,2,* A. Koitzsch,1,† B. S. Dennis,1 A. Gozar,1,‡ Hamza Balci,2 C. A. Kendziora,3 R. L. Greene,2 and G. Blumberg1,§ 1Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA 2Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742, USA 3United States Naval Research Laboratory, Code 6365, Washington D.C....
Laser based lightning control holds a promising way to solve the problem of the long standing disaster of lightning strikes. But it is a challenging project due to insufficient understanding of the interaction between laser plasma channel and high voltage electric filed. In this work, a direct observation of laser guided corona discharge is reported. Laser filament guided streamer and leader ty...
Technology is influencing education, providing new delivery and assessment models. A combination between online and traditional course, the hybrid (blended) course, may present a solution with many benefits as it provides a gradual transition towards technology enabled education. This research work provides a set of definitions for several course delivery approaches, and evaluates five years of...
سی و شش جمعیت از گونه‌های مختلف یونجه از مناطق طبیعی کشور جمع‌آوری شد و با استفاده از سلولهای مریستم انتهایی ریشه آنها، تعداد و ابعاد کروموزم‌ها در مرحله میتوز اندازه‌گیری و فرمول کاریوتیپی هر گونه تعیین گردید. این بررسی نشان داد که گونه M. sativa جمع آوری شده از مناطق مختلف ایران دارای دو سطح پلوئیدی دیپلوئید (16= n2) و تتراپلوئید (32 =n 2) است، در حالیکه گونه‌های M. rugosa وM. scutellata ت...
Wahiba Hamza ([email protected]) Lamia Ali Pacha ([email protected]) Tarik Hamadouche ([email protected]) Jean Müller ([email protected]) Nathalie Drouot ([email protected]) Farida Ferrat ([email protected]) Samira Makri ([email protected]) Malika Chaouch ([email protected]) Meriem Tazir ([email protected]) Michel Koenig ([email protected]) Traki Benhassine ...
Encroachment of woody plants into grasslands, and subsequent brush management, are among the most prominent changes to occur in arid and semiarid systems over the past century. Despite the resulting widespread changes in landcover, substantial uncertainty about the biogeochemical impacts of woody proliferation and brush management exists. We explored the role of shrub encroachment and brush man...
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