10,655 research outputs found
Microgravity: a Teacher's Guide with Activities, Secondary Level
This NASA Educational Publication is a teacher's guide that focuses on microgravity for the secondary level student. The introduction answers the question 'What is microgravity?', as well as describing gravity and creating microgravity. Following the introduction is a microgravity primer which covers such topics as the fluid state, combustion science, materials science, biotechnology, as well as microgravity and space flight. Seven different activities are described in the activities section and are written by authors prominent in the field. The concluding sections of the book include a glossary, microgravity references, and NASA educational resources
Microgravity: A Teacher's Guide With Activities in Science, Mathematics, and Technology
The purpose of this curriculum supplement guide is to define and explain microgravity and show how microgravity can help us learn about the phenomena of our world. The front section of the guide is designed to provide teachers of science, mathematics, and technology at many levels with a foundation in microgravity science and applications. It begins with background information for the teacher on what microgravity is and how it is created. This is followed with information on the domains of microgravity science research; biotechnology, combustion science, fluid physics, fundamental physics, materials science, and microgravity research geared toward exploration. The background section concludes with a history of microgravity research and the expectations microgravity scientists have for research on the International Space Station. Finally, the guide concludes with a suggested reading list, NASA educational resources including electronic resources, and an evaluation questionnaire
X-ray and infrared studies of several ruthenium-sulfur dioxide complexes
X-ray and infrared data on crystal and molecular structure of ruthenium-sulfur dioxide complexe
The crystal and molecular structure of ruthenium-sulfur dioxide coordination compounds. i- chlorotetraammine/sulfur dioxide/-ruthenium/ii/ chloride
Crystal and molecular structure of ruthenium- ammonia coordination compound
Carbonation cell materials compatibility
Material test and evaluation program for compatibility of materials with alkaline and acid electrolyte environments of carbonation cell syste
Quark asymmetries in the proton from a model for parton densities
Based on quantum fluctuations in momentum and of the proton into meson-baryon
pairs, we develop a physical model for the non-perturbative x-shape of parton
density functions in the proton. The model describes the proton structure
function and gives a natural explanation of observed quark asymmetries, such as
the difference between the anti-up and anti-down sea quark distributions and
between the up and down valence distributions. An asymmetry in the momentum
distribution of strange and anti-strange quarks in the nucleon is found to
reduce the NuTeV anomaly to a level which does not give a significant
indication of physics beyond the standard model.Comment: 27 pages, 11 figures. Updated with extended discussio
Direct carrier detection by in situ suppression hybridization with cosmid clones of the Duchenne/Becker muscular dystrophy locus
A basic problem in genetic counseling of families with Duchenne/Becker muscular dystrophy (DMD/BMD) concerns the carrier status of female relatives of an affected male. In about 60% of these patients, deletions of one or more exons of the dystrophin gene can be identified. These deletions preferentially include exon 45, which can be detected by multiplex polymerase chain reaction (PCR) and Southern blot analysis of genomic cosmid clones that map to this critical region. As a new approach for definitive carrier detection, we have performed chromosomal in situ suppression (CISS) hybridization with these cosmid clones in female relatives of four unrelated patients. In normal females, most metaphases showed signals on both×chromosomes, whereas only one×chromosome was labeled in carriers. Our results demonstrate that CISS hybridization can define the carrier status in female relatives of DMD patients exhibiting a deletion in the dystrophin gene
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