Böcker av Mohamed Abdel-Raheem

Le climat est l'un des principaux moteurs de la croissance des organismes et de la répartition des espèces ; par conséquent, un climat changeant peut potentiellement modifier la composition des communautés de plantes et de sols et les interactions entre elles. Toutefois, on sait très peu de choses sur les mécanismes sous-jacents impliqués et sur les conséquences pour les rétroactions sur le climat. En particulier, la plupart des études sur les FSP ont examiné le rôle des communautés microbiennes du sol, en se concentrant sur les effets nets de tous les microbes qui influencent positivement ou négativement les performances des plantes. L'identification des processus microbiens qui sous-tendent les changements dans les FSP, tels que les altérations induites par le changement climatique dans l'équilibre des taxons pathogènes et mutualistes ou des taxons microbiens saprophytes qui médient l'approvisionnement en nutriments des plantes, est un défi et nécessite l'identification de la contribution individuelle des différents composants biotiques du sol aux FSP. Nous abordons ici les réponses des PSF au changement climatique et leurs conséquences pour la biodiversité, le fonctionnement des écosystèmes et les effets potentiels de rétroaction sur le changement climatique.

Extension is a term which is open to a wide variety of interpretations. Each extension agent probably has his own understanding of what extension is. This understanding will be based on past experience and the particular type of extension service in which the agent is working. In other words, there is no single definition of extension which is universally accepted or which is applicable to all situations. Furthermore, extension is a dynamic concept in the sense that the interpretation of it is always changing. Extension, therefore, is not a term which can be precisely defined, but one which describes a continual and changing process in rural areas. The term extension may be examined by looking at a number of statements that have been written about it. Extension is an informal educational process directed toward the rural population. This process offers advice and information to help them solve their problems. Extension also aims to increase the efficiency of the family farm, increase production and generally increase the standard of living of the farm family. The objective of extension is to change farmers' outlook toward their difficulties.

Reptiles are ectothermic or cold-blooded, which means they cannot control their own body temperature. They must work with their environment to increase or decrease their body temperature. Basking in the sun raises their body temperature, and they move faster when warm.Take care with pet reptiles and amphibians.Healthy reptiles and amphibians can carry Salmonella and other germs that make people sick-especially young children. Take steps to keep you and your family healthy!Many people think that Salmonella infections are caused only by contaminated food, but you can also get infected by handling reptiles, which include turtles, lizards, and snakes, and amphibians like frogs, and salamanders.