Signals used to attract mates are often conspicuous to predators and parasites, and their evolution via sexual selection is expected to be opposed by viability selection. Many secondary sexual traits may represent a compromise between attractiveness and avoidance of detection. Although such signal exploitation appears to be widespread, most examples comefrom species that use acoustic or olfacto...

In the current situation, one of the most important issues of dry and semidry areas is the lack of water sources. In this regard, it's necessary to thank of solutions in order to increase productivity and efficiency of water use in agricultural sector; In this regard, various ways have been put forward by the experts and of the most important of them we can refer to participating agronomists in...

abstract. over the past decades, range managers have devoted extensive efforts to conserve and restore rangelands and sustain their exploitation but these efforts are more focused on the classic sciences and the exploiters' knowledge and experience have been neglected in the process. therefore, current study was done to deal with the prioritizing and comparing factors affecting rangeland exploi...

In the current situation, one of the most important issues of dry and semidry areas is the lack of water sources. In this regard, it's necessary to thank of solutions in order to increase productivity and efficiency of water use in agricultural sector; In this regard, various ways have been put forward by the experts and of the most important of them we can refer to participating agronomists in...

Abstract. Over the past decades, range managers have devoted extensive efforts to conserve and restore rangelands and sustain their exploitation but these efforts are more focused on the classic sciences and the exploiters' knowledge and experience have been neglected in the process. Therefore, current study was done to deal with the prioritizing and comparing factors affecting rangeland exploi...

Endowing agents that prefer cooperative outcomes with asymmetric power substantially increase the chances that both cooperative agents survive and that cooperative worlds evolve across a variety of structural settings of conflict and cooperation present in international relations; particularly when agents are endowed with the ability to selectively interact with other agents. These results are ...

University Chemistry Education is published in April and September. It receives substantial financial support from Glaxo Wellcome plc, and is available free of charge to all members of the Education Division of the Royal Society of Chemistry who are over 29 and employed in institutions of higher education. Glaxo Wellcome support for this journal forms part of a continuing programme of charitabl...

Introduction On 19 February 2001, a suspected case of foot and mouth disease was discovered at an abattoir in Essex in south-east England. The following day the case was confirmed by the Ministry of Agriculture, Fisheries and Food (MAFF), signalling not only the first major outbreak of the disease in Britain since 1967, but also the onset of one of the most serious economic and socialcrises to ...

The ultimate aim of any instrumentation must be 'sample in-result out in 1-2 min.'. This specification has been the reason for the phenomenal success of flame analysis, it is the reason for the now remarkable success of the near infra-red analysis for protein, fat etc. and for the continuing research after more than 60 years into all methods of electrode measurements. Yet Flow-Injection Analysi...