Recent studies suggest that vertebrate genetic material ingested by invertebrates (iDNA) can be used to investigate vertebrate ecology. Given the ubiquity of invertebrates that feed on vertebrates across the globe, iDNA might qualify as a very powerful tool for 21st century population and conservation biologists. Here, we identify some invertebrate characteristics that will likely influence iDNA retrieval and elaborate on the potential uses of invertebrate‐derived information. We hypothesize that beyond inventorying local faunal diversity, iDNA should allow for more profound insights (...) into wildlife population density, size, mortality, and infectious agents. Based on the similarities of iDNA with other low‐quality sources of DNA, a general technical framework for iDNA analyses is proposed. As it is likely that no such thing as a single ideal iDNA sampler exists, forthcoming research efforts should aim at cataloguing invertebrate properties relevant to iDNA retrieval so as to guide future usage of the invertebrate tool box. (shrink)

In this paper I examine what I will call "the standard account" of intrinsic value as it appears in recent textbooks written by John Hospers, William Frankena, and Richard B. Brandt. I argue: (a) it is not clear whether a theory of intrinsic value can be developed along the lines of the standard account; (b) if one is to develop such a theory, one will need to introduce a notion of "basic intrinsic value" in addition to the notion of "intrinsic (...) value"; and (c) several different theories of intrinsic value may account for the same judgments concerning desirability, and it will be arbitrary to choose one of these theories over another. (shrink)

An attempt to analyse what it is for belief to be based on reasons becomes involved with questions about the goodness of reasons and the gettier examples. intuitions about knowledge and the "gettier effect" can be used to decide when reasoning has occurred and what reasoning there has been. explanation by reasons is not deterministic.

Here is a pioneering volume that explores adolescent homosexuality around the world. Social scientists examine the personal experiences of gay and lesbian teenagers from culture to culture and address the problems and obstacles these young people face. The changing contexts, values, and goals of societies worldwide are affecting how these adolescents adapt to being homosexual, and this compelling book gives keen insight into how changes in the United States contrast with changes elsewhere. A unique and thorough description of the identities, (...) situations, and relationships of homosexual teens in many societies, Gay and Lesbian Youth will help social scientists, health care professionals, counselors, gay teenagers, and their parents to better understand the similarities of the problems facing these youth, while recognizing the minor differences in their social and personal situations. How do the personal experiences of gay and lesbian teenagers vary from culture to culture? Here is the best, most complete description of the identities, situations, and relationships of homosexual teens in many societies. The changing contexts, values, and goals of societies worldwide are affecting how these adolescents adapt to being homosexual, and this compelling book gives keen insight into how changes in the United States contrast with changes elsewhere. Social scientists, health care professionals, counselors, gay teenagers, and their parents will better understand the similarities of the problems facing these youth, while recognizing the minor differences in their social and personal situations. These differences must be understood by interpreting the adaptations of gay and bisexual teenagers around the world. (shrink)

Insect molting is elicited by a class of polyhydroxylated steroids, ecdysteroids, that originate in the prothoracic glands. Ecdysteroid synthesis in the prothoracic glands is controlled in large measure by a peptide hormone from the brain, prothoracicotropic hormone (PTTH), which exists in two forms and is released into the general circulation as a result of environmental and developmental cues. The means by which PTTH activates the prothoracic glands has been examined at the cellular level and the data reveal the involvement of (...) cAMP, calcium, calmodulin, cAMP‐dependent protein kinase and the ultimate phosphorylation of a 34 kDa protein tentatively identified as ribosomal protein S6. (shrink)