An automated coordinate recorder for biometry

Many measuring devices used in micropaleontology are unsatisfactory because observations must be recorded manually. Moreover, most use a linear scale that depends on the presence of predetermined morphological loci. An x, y recorder, largely adapted from instruments available in geological laboratories, is discussed. It obviates manual recording, frees data collection from the constraint of homologous loci and. in some applications, permits more shape information to be collected.     

Proposed Models for Angiotensin II in Aqueous Solution and Conclusions about Receptor Topography

Angiotensin II has an uncertain molecular basis in aqueous solution; two models are proposed here, a β-turn and a γ-turn model, of which the latter seems the more likely.     

The Changing Roles of Zoological Parks in Conserving Biological Diversity

SYNOPSIS. Zoological parks are evolving institutions in respectto the conservation of biological diversity. From past functionsin recreation as menageries and in education as living museums,they are coming to discharge these functions, plus other meaningfulones in research and conservation, as internationally orientedconservation centers. Education is the primary function in conservation,but zoos have begun to make significant contributions as geneticrefuges and reservoirs, especially for large vertebrate speciesthreatened with extinction. In developing this capacity zooshave fostered investigations into several facets of small populationbiology. These have extended to simulation modelling to helppredict the outcome of various combinations of ecological, genetic,and demographic factors on the viability of populations in captivityand in the wild. Because resources of zoos are limited in respectto their enlarged functions in conservation and research, theyare encouraging development of criteria to help prioritize actionsfor conservation of biodiversity. North American, European,and Australian zoos are meanwhile assisting the developmentof technical capacities among zoo counterparts, government agencies,and protected areas in both developing and developed countriesof the world to further the conservation of biodiversity. Similarinvolvement by other biological institutions and by biologicalprofessional associations can make important contributions topolicies of nations and actions of people that determine theprospects for survival of much of the biota.