'Most habitable worlds in the cosmos will have no remotely detectable signs of life' is proposed as a biological hypothesis to be tested in the study of exoplanets. Habitable planets could be discovered elsewhere in the Universe, yet there are many hypothetical scenarios whereby the search for life on them could yield negative results. Scenarios for habitable worlds with no remotely detectable ...

The theme of evolutionary governance is arising often in the public discourse now-usually either in regard to some aspect of biotechnology, or in connection with our modifications of ecosystems through climate change and other interventions. It is a favorite subject of science fiction writers who weave marvelous tales about future worlds and beings shaped by human artifice, and it frames the co...

the study investigated secondary school students' environmental awareness in india and iran. nine hundred and ninety-one students were selected through the stratified random sampling technique from 103 secondary schools of mysore city (india) and tehran city (iran). subjects consisted of 476 boys and 515 girls. they were assessed using the environment awareness ability measure (eaam). resu...

Virtual worlds seek to provide an online setting where users can interact in a shared environment. Popular virtual worlds such as Second Life and World of Warcraft, however, rely on share-nothing data and strict partitioning as much as possible. They translate a large world into many tiny worlds. This partitioning conflicts with the intended goal of a virtual world by greatly limiting interacti...

b a c k g r o u n d & aim: quality-of-life (qol) among human immunodeficiency  virus (hiv)-infected people  has  been  the  center  of  focus  worldwide.  the  world  health  organization  qol  group (whoqol  group)  has developed  a 31-item qol questionnaire,  which  has been  translated  and used in many countries. this paper aimed at examining the reliability and validity of persian version ...

Icy worlds in the solar system and beyond have attracted a remarkable attention as possible habitats for life. The current consideration about whether life exists beyond Earth is based on our knowledge of life in terrestrial cold environments. On Earth, glaciers and ice sheets have been considered uninhabited for a long time as they seemed too hostile to harbor life. However, these environments...

a simple, reproducible and rapid gas chromatographic method for precise determination of valproic acid (vpa) in human plasma has been developed. total time for sample preparation and gc analysis is less than 45 min. after plasma protein precipitation, vpa was extracted into chloroform with suitable recovery. by using stabilwax®-da capillary gc column, a symmetrical gas chromatographic peak was ...