Volunteering in Cross-National Perspective: Initial Comparisons

Anheier and Salamon shed some light on volunteering in different parts of the world by exploring the conceptions and patterns of voluntary action cross-nationally. As a cultural and economic phenomenon, volunteering is part of the way societies are organized, how they allocate social responsibilities, and how much engagement and participation they expect from citizens

A stability study and moral analysis of a space-station - Centrifuge configuration

Dynamic stability of space station-centrifuge configuratio

Subunit Stoichiometry of a Heteromultimeric G protein-coupled Inward-rectifier K^+ Channel

We investigated the stoichiometry of the heteromultimeric G protein-coupled inward-recitfier K^+ channel (GIRK) formed from GIRK1 and GIRK4 subunits. Multimeric GIRK constructs with several concatenated channel subunits were expressed in Xenopus oocytes. Coexpression of various trimeric constructs with different monomers clearly showed that the functional channel has stoichiometry (GIRK1)_2(GIRK4)_2. Efforts to establish a preferred arrangement of subunits around the channel pore suggest that more than one arrangement may be viable

Environmental engagement demand differences within and among Holland academic environments

College and university administrators have increased the use of measurements of student engagement to gauge the levels on their campuses. However, little research measures student engagement levels among different academic environments or different academic majors. Some research has been done that used Holland\u27s theory of person/environment fit, and accompanying Hexagonal model, as a means to compare differences among academic environments. However, the validity of the assumptions that the model is based on has not been examined, nor the validity of the grouping of academic majors into environments. The data set used for this study is the 2005 National Survey of Student Engagement (NSSE). Multivariate analysis of six academic environments, comprised of 25 academic majors, found mixed results concerning the validity of Holland\u27s hexagonal model and its use as a categorization to compare academic environments. Cluster analysis of 25 academic majors revealed mixed results concerning the grouping of majors into Holland assigned academic environments

Procerberus Enamel: A Missing Link

In a fossil tooth of Procerberus (a Late Cretaceous palaeoryctid insectivore), there is a unique, clear and simultaneous expression of all three known forms of enamel: prismatic, pseudo-prismatic and aprismatic. The pseudoprismatic domain, generally regarded as the more primitive unit compared to the prismatic domain, may be interpreted in this material as that morphological territory in which the prism appears, or evolves, as an additional structural unit. It is possible to construct a three-dimensional, developmental scheme for Procerberus enamel on the basis of known principles and to use it to help build a conceptual bridge between synapsid and mammalian enamel