نتایج جستجو برای: flora and fauna
تعداد نتایج: 16838707 فیلتر نتایج به سال:
It is inevitable that mining exploitation, in addition to having a positive impact on national income can also have negative the environment, such as reduced diversity of both flora and fauna. To restore environmental functions, companies are required carry out mine reclamation. Environmental management needs be carried after reclamation activities monitoring evaluating success reclamation, esp...
Tanytrachelos ahynis (n.gen., n. sp.) is a lepidosaur from the Late Triassic Dan River Group (Newark Supergroup) of North Carolina and Virginia. The new reptile has gracile proportions similar to Tanystropheus (Middle Triassic) and is referred to the family Tanystropheidae of the suborder Prolacertiformes. Unlike Tanystropheus, Tanytrachelos has relatively short cervical vertebrae bearing splin...
Spirals are surprisingly common in science, nature, physics, astronomy, flora and fauna, and the arts. In Cartesian coordinates they are typically transcendental functions, which makes the evaluation on Cartesian grids an inefficient process. We propose a construction scheme for piecewise circular approximations. The algorithm is convergent and consists of generating center coordinates and radi...
Before Newton's seminal work on the spectrum, seventeenth-century English natural philosophers such as Robert Boyle, Robert Hooke, Nehemliah Grew and Robert Plot attributed the phenomenon of color in the natural world to salts and saline chymistry. They rejected Aristotelian ideas that color was related to the object's hot and cold qualities, positing instead that saline principles governed col...
Mosquitoes are the principal vectors of malaria and other vector borne diseases and contribute to major disease burden in India. Disease transmission can be interrupted by controlling the vectors using various methods. However, the extensive and unbalanced use of chemical insecticides have created problems like enhancing resistance of mosquito population to synthetic insecticides, pollution of ...
The quantitative characters in Drosophila such as body size or fecundity, are very sensitive to environmental changes e.g. temperature or larval nutrition under laboratory conditions. In nature, the same situation is found where changes in annual temperature or humidity affect the type of flora as well as the size of Drosophila, fauna. In the present studies, we found that latitudinal clines ex...
Adhesive apparatus is the modifications of the skin of the ventral surface. Fast water current is the single most important limiting factor deciding the occurrence and survival of fauna and flora unless equipped with special adaptive features to with-stand the vicissitudes of nature. In hillstream fishes, the presence of adaptive modifications in their body organization is of prime importance f...
post-glacial recolonization in European and other habitats, a process that emanated from various southern refugia and that often involved crosses among conspecific populations in hybrid zones (Hewitt, 2000). But if there are no field biologists who know their flora and fauna, geneticists will neither have material to work on, nor will they know the biology of the organisms they are studying. In...
1. The Executive Secretary is please to circulate herewith, for the information of participants in the fifteenth meeting of the Subsidiary Body on Scientific, Technical and Technological Advice, an information document on livelihood alternatives for the unsustainable use of bushmeat of the Convention on Biological Diversity, prepared by a consultant in preparation for the joint meeting of the L...
The rapid expansion of deserts in recent decades as a result of human actions combined with climatic disasters has highlighted the necessity to understand biological processes in arid environments. Whereas physical processes and the biology of flora and fauna have been relatively well studied in marginally used arid areas, knowledge of desert soil micro-organisms remains fragmentary. This chapt...
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