Spartan Daily October 16, 2012

Volume 139, Issue 26https://scholarworks.sjsu.edu/spartandaily/1342/thumbnail.jp

New Views of Multi-Ion Channels

Thus, most site-directed mutagenesis data render it untenable to consider that two or more roughly equivalent high affinity sites govern selectivity in multi-ion pores. The papers by Dang and McCleskey and Kiss et al. respond to this challenge by showing that a model with a single high affinity site, flanked by two binding sites of lower affinity close to the pore entrances, can generate much of the classical multi-ion behavior. The sites need not interact, and the two flanking sites could arise from one of several mechanisms: a featureless charged vestibule, a dehydration step, or a specific weak binding site. The multi-ion pore remains a cornerstone of permeation theory, but the new theory features only a single high affinity site and no mutual repulsion. The high flux rate occurs because ions pause at the flanking sites and reequilibrate thermally, gaining enough energy to move over the next barrier

Spartan Daily October 16, 2012

Volume 139, Issue 26https://scholarworks.sjsu.edu/spartandaily/1342/thumbnail.jp

Spartan Daily October 16, 2012

Volume 139, Issue 26https://scholarworks.sjsu.edu/spartandaily/1342/thumbnail.jp

College of Natural Sciences Newsletter, October 2021

Volume 2, Issue 10 Page 1 Dean\u27s MessagePage 2 Awards and Recognition; Introducing Natural Sciences Student AmbassadorsPage 3 Media Coverage of CNSPage 4 Spooky Science OutreachPage 5 The BIG Event OutreachPage 6 Geography Club Road TripPage 7 Aamlid Family Anatomy LabPage 8 Hobo Day RecapPage 10 Open PRAIRIE Data; Grants Awarded in CNShttps://openprairie.sdstate.edu/consci_pubs/1020/thumbnail.jp

Children’s Experiences and Self-Identification with Science in the Context of an Out-of-School STEM Program

The goal of this case study was to examine how a group of young children in a historically marginalized neighborhood in the northern part of the Netherlands perceived their engagement in an out-of-school, STEM community-based program aiming to enhance young children’s interest and self-identification with science. We collected data through semi-structured interviews with eight purposefully selected children and analyzed those through a constant comparative approach and with the use of open coding strategies. The findings revealed specific aspects of the design of the program that were perceived as motivating and engaging: the integrated multidisciplinary approach to exploring scientific concepts and opportunities for active engagement and personally relevant science experimentation. The findings are offered alongside a set of recommendations for the design of out-of-school, community-based programs that aim to support young children’s engagement with science

Illuminator, Volume 5, Issue 2

October 2022 issue of Illuminator, a monthly publication of ODU\u27s Batten College of Engineering and Technology.https://digitalcommons.odu.edu/engineering_newsletter/1031/thumbnail.jp

Impact of massive tau-neutrinos on primordial nucleosynthesis. Exact calculations

The influence of a massive Majorana tau-neutrino on primordial nucleosynthesis is rigorously calculated. The system of three integro-differential kinetic equations is solved numerically for the tau-neutrino mass in the interval from 0 to 20 MeV. It is found that the usual assumption of kinetic equilibrium is strongly violated and non-equilibrium corrections considerably amplify the effect. Even a very weak restriction from nucleosynthesis, allowing for one extra massless neutrino species, permits to conclude that m_\nu_\tau < 1 MeV. For a stricter bound, e.g. for dN < 0.3, the limit is m_\nu_\tau < 0.35 MeV.Comment: 30 pages, 9 figures, 2 tables, revised figures, minor change