Nanoscience has enabled the understanding of organisation of the atomic and molecular world. Due to the unique chemical, electronic and magnetic properties nanomaterials have wide applications in the chemical, manufacturing, medical sector etc., Single walled carbon nanotubes, buckyballs, ZnSe quantum dots, TiO 2 nanoparticle based products are nearing commercialisation. Research is on-going worldwide on suitable delivery systems for nanomaterial based drugs. Nanomaterials are highly reactive in biological systems due to the large surface area. While the benefits of nanomaterials are evident (...) there are studies which indicate the potential risk to biological systems. Substances known to be harmless in bulk can be potentially toxic in certain fibrous and nanoparticle form. Risk assessment studies with nanomaterials largely focus on mouse models. There are very few studies on their effects on aquatic species and plants which form the largest in the productivity chain with respect to the ecological pyramid. This study reviews the research done worldwide in the area of risk assessment of nanomaterials, particularly the effects on aquatic and plant systems. Risk assessment is the foundation for regulatory decision making. A general comparison of the regulatory regime in nanotechnology is performed to understand the extent of development. (shrink)

This study compares 20 subjects, in each of three different settings, with serious psychotic disorder who hear voices, and compares their voice-hearing experience. We find that while there is much that is similar, there are notable differences in the kinds of voices that people seem to experience. In a California sample, people were more likely to describe their voices as intrusive unreal thoughts; in the South Indian sample, they were more likely to describe them as providing useful guidance; and in (...) our West African sample, they were more likely to describe them as morally good and causally powerful. What we think we may be observing is that people who fall ill with serious psychotic disorder pay selective attention to a constant stream of many different auditory and quasi-auditory events because of different “cultural invitations”—variations in ways of thinking about minds, persons, spirits and so forth. Such a process is consistent with processes described in the cognitive psychology and psychiatric anthropology literature, but not yet described or understood with respect to cultural variations in auditory hallucinations. We call this process “social kindling.”. (shrink)

A single Sanskrit commentary exists for the Caṇḍamahāroṣaṇatantra—the Padmāvatī of Mahāsukhavajra—the only palm-leaf witness of which is preserved in a late thirteenth-century manuscript in Kathmandu. The tantra is relatively late, unmentioned outside Nepal, and the only in-depth study to date examines only the first eight of its twenty five chapters. No study or edition of the Padmāvatī exists. Here we present the first edition and translation of a complete chapter, the sixth paṭala, a section dealing mainly with transgressive sexual practices. (...) Some of the ideas and pragmatic details presented by the author, Mahāsukhavajra, are unique in Vajrayāna literature. (shrink)