5,003 research outputs found
The ecology of the intestinal flora in a changing environment Final report
Resume of publications and recommendations from symposium on intestinal flora ecology in changing environment
An evaluation of nutritional markers, volume 2
Use of nutritional markers for studies of food intake, passage, and absorption in gastrointestinal track of humans and animal
Research on long term biological isolation of primates and mice. Volume 4 - The literature search, appendix M Final report
Literature search for effects of intestinal microflora on host organism
Research on long term biological isolation of primates and mice, volume 1 Final report, 7 Jan. 1969 - 7 Jan. 1970
Long term effects of biological isolation on monkeys and mice with application to prolonged space fligh
Energy and Nutrient Intake Monitoring
A passive system to determine the in-flight intake of nutrients is developed. Nonabsorbed markers placed in all foods in proportion to the nutrients selected for study are analyzed by neutron activation analysis. Fecal analysis for each market indicates how much of the nutrients were eaten and apparent digestibility. Results of feasibility tests in rats, mice, and monkeys indicate the diurnal variation of several markers, the transit time for markers in the alimentary tract, the recovery of several markers, and satisfactory use of selected markers to provide indirect measurement of apparent digestibility. Recommendations are provided for human feasibility studies
Apollo diet evaluation, Volume 1
Nutritional evaluation of Apollo diets and gnotobiological study of mice having diets with limited microflor
Effects of Early Childhood Intervention on Fertility and Maternal Employment: Evidence from a Randomized Controlled Trial
This paper presents the results of a randomized study of a home visiting program implemented in Germany for low-income, first-time mothers. A major goal of the program is to improve the participants' economic self-sufficiency and family planning. I use administrative data from the German social security system and detailed telephone surveys to examine the effects of the intervention on maternal employment, welfare benefits, and household composition. The study reveals that the intervention unintentionally decreased maternal employment and increased subsequent births. These results contradict those of previous studies from the United States, where home visiting programs successfully increased employment and decreased fertility. Analyzing the reason for the different results, suggests that the program interacts with low employment incentives and generous welfare state arrangements for disadvantaged mothers with young children in Germany
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A Search for Dark Higgs Bosons
Recent astrophysical and terrestrial experiments have motivated the proposal
of a dark sector with GeV-scale gauge boson force carriers and new Higgs
bosons. We present a search for a dark Higgs boson using 516 fb-1 of data
collected with the BABAR detector. We do not observe a significant signal and
we set 90% confidence level upper limits on the product of the Standard
Model-dark sector mixing angle and the dark sector coupling constant.Comment: 7 pages, 5 postscript figures, published version with improved plots
for b/w printin
Isotopic Composition of Light Nuclei in Cosmic Rays: Results from AMS-01
The variety of isotopes in cosmic rays allows us to study different aspects
of the processes that cosmic rays undergo between the time they are produced
and the time of their arrival in the heliosphere. In this paper we present
measurements of the isotopic ratios 2H/4He, 3He/4He, 6Li/7Li, 7Be/(9Be+10Be)
and 10B/11B in the range 0.2-1.4 GeV of kinetic energy per nucleon. The
measurements are based on the data collected by the Alpha Magnetic
Spectrometer, AMS-01, during the STS-91 flight in 1998 June.Comment: To appear in ApJ. 12 pages, 11 figures, 6 table
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