Online courses and even degree programs are becoming a widespread phenomenon at universities across the United States. Research into the effectiveness of these courses is in the early stages. This qualitative study explored student perceptions of their online class experience using expectancy-value theory as a framework in an attempt to...
Improvements in instrumentation for fluorometric kinetic
measurements and the application of a new intensified diode array (IDA)
rapid scanning system to low level transient fluorescence measurements
are reported. This instrumentation is applied to a new fluorometric
kinetic method for thiamine (TM).
Modifications to the existing fluorometric reation rate instrument
include...
Comparative phylogeography offers a unique opportunity to understand the interplay between past environmental events and life-history traits on diversification of unrelated but co-distributed species. Here, we examined the effects of the quaternary climate fluctuations and palaeomarine currents and present-day marine currents on the extant patterns of genetic diversity in the...
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either side of the Central
American Isthmus
Ivania Cer�on-Souza1,2, Elena G. Gonzalez3, Andrea E
Adolescence is a developmental stage marked by crystallization in individuals’ sense of identity (Erikson, 1994; Harter, 1999). Research on positive youth development stresses the ways in which thriving trajectories during adolescence contribute to positive lifelong outcomes (Lerner & Overton, 2008; Scales, Benson, & Roehlkepartain, 2011) A symbolic interactionism perspective (Mead,...
Chemical dosimetry developed in response to needs created by
developments in the field of high-energy radiation. Shortly after the
discovery of X-rays in 1895 and of radioactivity in 1896, the deleterious
effects of ionizing radiation were recognized. To guard against the
injurious effects of radiation in medical application, dose-measuring
methods...
This study compared three approaches to the improvement of
vocabulary in ninth grade language arts classes: the direct-teaching
approach, the interest-in-words approach, and the wide-reading
approach. Answers to the following questions were sought: which of
these approaches to vocabulary improvement is more effective than
each other approach used in this...
Everyone involved in online education talks about community – what is it, how is it created, do students really want it? Most researchers now agree that online education is enhanced through a greater sense of community within the online classroom; however, the factors that make for a substantive and quality...
In 1952, at the height of the McCarthy era, Franz Kallmann, a Jewish psychiatrist and eugenicist who fled the National Socialist regime in Germany, published a study, in which he claimed to have found a one hundred percent concordance rate for homosexuality among forty pairs of identical twins. From this...
The USDA Forest Service has an outstanding scientific resource in the 77 Experimental Forests and Ranges that exist across the United States and its territories. These valuable scientific resources incorporate a broad range of climates, forest types, research emphases, and history. This publication describes each of the research sites within...