نتایج جستجو برای: plant groups
تعداد نتایج: 1099878 فیلتر نتایج به سال:
BACKGROUND One of the most significant consequences of contemporary global change is the rapid decline of biodiversity in many ecosystems. Knowledge of the consequences of biodiversity loss in terrestrial ecosystems is largely restricted to single ecosystem functions. Impacts of key plant functional groups on soil biota are considered to be more important than those of plant diversity; however,...
Prophylactic and therapeutic efficacy of a combination of Capsicum frutescens (red pepper), Citrus limon (lemon) and Opuntia vulgaris (prickly pear) against Newcastle disease (ND) in domestic fowl were evaluated. Eighty-eight broiler chickens were divided into five groups. Birds from three groups were inoculated with velogenic ND virus strain, whereas birds from two groups were left as controls...
More severe summer droughts are predicted for mid-latitudes in Europe. To evaluate the impact on forest ecosystems and more specifically on forest regeneration, we studied the response to summer drought in oak seedlings (Quercus petraea). Acorns were collected from different mother trees in three stands in Belgium, sown in pots and grown in non-heated greenhouse conditions. We imposed drought o...
this study was designed to investigate the impacts of teachers self-disclosure on students foreign language classroom anxiety, attitude to english language learning and their achievement scores at the end of the term. there were 48 female learners of intermediate level. they were not randomly selected. there were one experimental group with 21 students and one control group with 27 students.the...
In this paper, in addition to some elementary facts about the ultra-groups, which their structure based on the properties of the transversal of a subgroup of a group, we focus on the relation between a group and an ultra-group. It is verified that every group is an ultra-group, but the converse is not true generally. We present the conditions under which, for every normal subultra-group of an u...
Recognition of habitats and conditions of species presences in differentsituations can be effective in proper utilization of vegetation. Little is known about thevegetation composition of Boralan Mountain region located in North West of Iran in theborder of Turkey and Azerbaijan with the altitude range of 800-2000m. The aim of thisstudy therefore was to investigate the floristic composition qua...
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