Standing on Shaky Ground: Americans' Experiences With Economic Insecurity

Based on 2009 Surveys of Economic Risk Perceptions and Insecurity, examines Americans' experience of economic insecurity, such as frequency and duration, buffers against hardship, and concerns by income, family structure, race/ethnicity, and education

Distribution and composition of macrobenthic communities along a Victoria-Land Transect (Ross Sea, Antarctica)

The Victoria-Land Transect project onboard the Italian research vessel ‘‘Italica’’ in February 2004, was a large-scale attempt to obtain benthic samples of smaller macrozoobenthic specimens systematically along a latitudinal and a depth transect along the Victoria- Land coast. Data presented from this survey are based on Rauschert dredge samples, which were taken at four areas at depth ranging from 84 to 515 m. A cluster analysis based on relative numbers of abundance was performed and demonstrated a change in community structure depending on the location along the latitudinal transect. A change in community structure with depth was not recorded. Dominant taxa of the Ross Sea fauna along the Victoria-Land coast were the Arthropoda (65.7%), followed by Annelida (20.7%), Mollusca (9.6%) and Echinodermata (2.5%). Total number of abundance decreased with depth with an exception at Cape Russell, whereas a trend in biomass was not documented. Abundance and biomass proportions of major taxa changed gradually along the latitudinal transect

Influence of Fertilizer Nitrogen and Sulfur on Production of Malting Barley

Studies in north-central Nebraska from 1975 through 1977: 1. Evaluated the malting barley production potential of the irrigated sandy soils of the region. 2. Measured the effect of application of N and S on yield and quality of barley grown for malting purposes. 3. Investigated the ability of N analysis of barley in the vegetative stage to predict protein content of grain at harvest. Data gathered lead to the following conclusions: 1. The potential for production of malting barley on irrigated sandy soils of north-central Nebraska is limited. 2. Yields increased with the application of fertilizer N throughout the study although response varied with site and variety. 3. Application of fertilizer S had no effect on yield throughout the study. 4. Application of N increased the protein content of all grain varieties studied by approximately 2 to 3 percent. 5. Analysis of plant material collected at the boot stage for N provided a reliable indication of the grain protein content

El papel de los síndromes culturales y los remedios tradicionales mexicanos en la promoción de salud de los niños

Purpose: To describe the context in which culture-bound syndromes that mothers of Mexican descent believed affected child wellness and describe how they restored health when these syndromes affected their children. Design: The findings of this come from a larger study that focused on the health promotion and protection practices used by mothers of Mexican descent in urban Texas A naturalistic design, using Spradley’s ethnographic interview techniques and participant observations, was selected to explore and describe the child health promotion and protection practices, including culture-bound syndromes, used by mothers of Mexican origin.   Method: Data collection consisted of 21 ethnographic interviews enhanced by focused home observations with nine Spanish speaking mothers.   Results: To these group of mothers, the culture-bound syndromes of empacho, fright and evil eye could affect children’s eating and sleep patterns, thereby causing an imbalance in a child’s wellbeing. Therefore the participants believed that they had be mindful of culture-bound syndromes that affected their children’s health and take care of those syndromes by using folk remedies to restore balance in their children’s’ wellbeing. Conclusion: The findings of this study provide an in-depth description of culture-bound syndromes and the folk remedies which mother of Mexican descent used to promote and protect the health of their preschool children. This knowledge provides a framework for healthcare professionals to use when working with mothers of Mexican descent who may be using folk healing to promote and protect the health of their children.Objetivo: Describir el contexto en el que los síndromes culturales de las madres de ascendencia mexicana creían que afectaban a la salud infantil y describir cómo ellas mejoraban la salud cuando estos síndromes afectaban a sus hijos. Diseño: Los resultados de este estudio se basan en una amplia investigación que se centró en la promoción de la salud y las prácticas de protección usadas por las madres de ascendencia mexicana en la ciudad de Texas. Se seleccionó un diseño naturalista, mediante las técnicas de entrevistas etnográficas de Spradley y observaciones de los participantes,  para explorar y describir la promoción de la salud infantil y las prácticas de protección, incluyendo los síndromes culturales usados por las madres de origen mexicano. Método: La recopilación de los datos consistió en 21 entrevistas etnográficas mejoradas por el enfoque de las observaciones en hogares con 9 madres de habla hispana. Resultados: Para este grupo de mujeres, los síndromes culturales del “empacho”, “mal de ojo” y “susto” podían provocar trastornos alimenticios y del sueño, causando un desajuste en el bienestar del niño. Además, las participantes creían que ellas tenían que ser conscientes de los síndromes culturales que afectaban a la salud de sus hijos y cuidar aquellos síndromes usando remedios tradicionales para promocionar y proteger la salud de sus niños. Conclusión: Los resultados de este estudio ofrecen una descripción en profundidad de los síndromes culturales y los remedios tradicionales que las madres de ascendencia mexicana usaban para promocionar y proteger la salud de sus niños. Este conocimiento ofrece un marco para que los profesionales de la salud lo usen cuando trabajen con madres de ascendencia mexicana que pueden estar usando este tipo de medios para cuidar a sus hijos

Low Mach Number Modeling of Type Ia Supernovae

We introduce a low Mach number equation set for the large-scale numerical simulation of carbon-oxygen white dwarfs experiencing a thermonuclear deflagration. Since most of the interesting physics in a Type Ia supernova transpires at Mach numbers from 0.01 to 0.1, such an approach enables both a considerable increase in accuracy and savings in computer time compared with frequently used compressible codes. Our equation set is derived from the fully compressible equations using low Mach number asymptotics, but without any restriction on the size of perturbations in density or temperature. Comparisons with simulations that use the fully compressible equations validate the low Mach number model in regimes where both are applicable. Comparisons to simulations based on the more traditional anelastic approximation also demonstrate the agreement of these models in the regime for which the anelastic approximation is valid. For low Mach number flows with potentially finite amplitude variations in density and temperature, the low Mach number model overcomes the limitations of each of the more traditional models and can serve as the basis for an accurate and efficient simulation tool.Comment: Accepted for publication in the Astrophysical Journal 31 pages, 5 figures (some figures degraded in quality to conserve space

Linear approaches to intramolecular Förster Resonance Energy Transfer probe measurements for quantitative modeling

Numerous unimolecular, genetically-encoded Forster Resonance Energy Transfer (FRET) probes for monitoring biochemical activities in live cells have been developed over the past decade. As these probes allow for collection of high frequency, spatially resolved data on signaling events in live cells and tissues, they are an attractive technology for obtaining data to develop quantitative, mathematical models of spatiotemporal signaling dynamics. However, to be useful for such purposes the observed FRET from such probes should be related to a biological quantity of interest through a defined mathematical relationship, which is straightforward when this relationship is linear, and can be difficult otherwise. First, we show that only in rare circumstances is the observed FRET linearly proportional to a biochemical activity. Therefore in most cases FRET measurements should only be compared either to explicitly modeled probes or to concentrations of products of the biochemical activity, but not to activities themselves. Importantly, we find that FRET measured by standard intensity-based, ratiometric methods is inherently non-linear with respect to the fraction of probes undergoing FRET. Alternatively, we find that quantifying FRET either via (1) fluorescence lifetime imaging (FLIM) or (2) ratiometric methods where the donor emission intensity is divided by the directly-excited acceptor emission intensity (denoted R<sub>alt</sub>) is linear with respect to the fraction of probes undergoing FRET. This linearity property allows one to calculate the fraction of active probes based on the FRET measurement. Thus, our results suggest that either FLIM or ratiometric methods based on R<sub>alt</sub> are the preferred techniques for obtaining quantitative data from FRET probe experiments for mathematical modeling purpose

Alternative Splicing of Micro-Exons Creates Multiple Forms of the Insect Cell Adhesion Molecule Fasciclin I

Fasciclin I is a homophilic cell adhesion molecule in insects that is dynamically expressed on a subset of axon pathways in the embryonic nervous system, and on a variety of other cells and tissues during development. The fasciclin I protein consists of four homologous 150 amino acid domains. In this article, we describe the complete sequence of the Drosophila fasciclin I (fasI) gene. The gene consists of 15 exons and is distributed over 14 kilobases of DNA. We examine the structure and temporal expression pattern of multiple fasciclin I mRNAs that differ in the lengths of their 3′ untranslated regions. We also show that a highly conserved sequence at the end of the second domain can be altered by the addition of three or six amino acids that are encoded by two alternatively spliced 9 base pair (bp) micro-exons. In grasshopper fasciclin I mRNAs, there are 9 bp and 6 bp insertions at the same position. The first of these insertions is identical in sequence to the first fly micro-exon. The grasshopper insertions are not found together in the same mRNA, so grasshopper fasciclin I species differ by the addition of three or two extra amino acids to the second domain. The alternatively spliced mRNAs are differentially expressed during embryogenesis, and all three of them are present in nerve cord preparations. We suggest that the amino acids inserted by alternative micro-exon splicing may alter the binding specificity of fasciclin I

The 8^8B Neutrino Spectrum

Knowledge of the energy spectrum of $^8$B neutrinos is an important ingredient for interpreting experiments that detect energetic neutrinos from the Sun. The neutrino spectrum deviates from the allowed approximation because of the broad alpha-unstable $^8$Be final state and recoil order corrections to the beta decay. We have measured the total energy of the alpha particles emitted following the beta decay of $^8$B. The measured spectrum is inconsistent with some previous measurements, in particular with a recent experiment of comparable precision. The beta decay strength function for the transition from $^8$B to the accessible excitation energies in $^8$Be is fit to the alpha energy spectrum using the R-matrix approach. Both the positron and neutrino energy spectra, corrected for recoil order effects, are constructed from the strength function. The positron spectrum is in good agreement with a previous direct measurement. The neutrino spectrum disagrees with previous experiments, particularly for neutrino energies above 12 MeV.Comment: 15 pages, 13 figures, 4 tables, submitted to Phys. Rev. C, typos correcte