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  • 1
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    Tissue perfusion rate determined from the decay of oxygen-15 activity after photon activation in situ (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-06-15
    Description: Rates of cerebral perfusion were obtained from measurements of the disappearance (wash-out) of oxygen-15 after in situ tissue activation with 45-million-volt x-rays. In an anesthetized cat, typical values were 90 milliliters per minute per 100 grams of tissue, with 55 percent wash-out. In a specific radiotherapy patient, the value was 65 milliliters per minute per 100 grams of tissue, with 63 percent wash-out of oxygen-15 through incorporation into tissue water.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hughes, W L -- Nussbaum, G H -- Connolly, R -- Emami, B -- Reilly, P -- New York, N.Y. -- Science. 1979 Jun 15;204(4398):1215-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/451567" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/*blood supply ; Cats ; Humans ; Neoplasms/blood supply ; Oxygen/*blood/radiation effects ; Oxygen Radioisotopes ; *Regional Blood Flow ; X-Rays
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Enkephalin-like material elevated in ventricular cerebrospinal fluid of pain patients after analgetic focal stimulation (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-08-04
    Description: Enkephalin-like activity has been measured in the ventricular cerebrospinal fluid of patients with intractable pain. Electrical stimulation of periventricular brain sites resulted in significant decrease in persistent pain in these subjects. This analgesia, which was blocked by naloxone in 80% of the cases, was accompanied by a significant rise in ventricular enkephalin-like activity, as measured by two different methods. The results present evidence of in vivo release of enkephalin-like material in humans and suggest that stimulation analgesia may be partially due to this release.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Akil, H -- Richardson, D E -- Hughes, J -- Barchas, J D -- New York, N.Y. -- Science. 1978 Aug 4;201(4354):463-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/663668" target="_blank"〉PubMed〈/a〉
    Keywords: Brain/*physiopathology ; Cerebral Aqueduct ; Electric Stimulation ; Endorphins/*cerebrospinal fluid ; Enkephalins/*cerebrospinal fluid ; Female ; Humans ; Male ; Pain/*cerebrospinal fluid/physiopathology ; Pain Management
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Manufacture of DPFC-DMS polymer in the SKG range (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: BPFC-DMS block copolymers were synthesized on a pre-pilot scale (i.e., to 5 Kg lots) and subsequently fabricated into clear, colorless films. Details of the synthesis procedures, property determinations, and film casting techniques are presented. Solubility, viscosity and molecular weight characteristics of the resulting product are reported.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-166276 , NAS 1.26:166276
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Flammability screening tests of resins (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Selected flammability characteristics of glass cloth laminates of thermosetting resins are evaluated. A protocol for the evaluation of the flammability hazards presented by glass cloth laminates of thermosetting resins and the usefulness of that protocol with two laminates are presented. The glass laminates of an epoxy resin, M-751 are evaluated for: (1) determination of smoke generation from the laminates; (2) analysis of products of oxidative degradation of the laminates; (3) determination of minimum oxygen necessary to maintain flaming oxidation; (4) evaluation of toxicological hazards.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-152312 , UTEC-79-140
    Format: application/pdf
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  • 5
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    Determination of mechanical properties of polymer film materials (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Five polymeric film materials, Tedlar, Teflon, Kapton H, Kapton F, and a fiberglass reinforced polyimide, PG-402, in thickness ranging from 0.002 to 0.005 inch, were tested over a temperature range of -195 to 200 C in the "machine" and transverse direction to determine: elastic modulus, Poisson's ratio, three percent offset yield stress, fracture stress, and strain to fracture. The elastic modulus, yield stress and fracture stress decreased with increasing temperature for all the materials while the fracture strain increased. Teflon and Tedlar had the greatest temperature dependence and PG-402 the least. At 200 C the Poisson ratio values ranged from 0.39 to 0.5; they diminished as the temperature decreased covering a range of 0.26 to 0.42 at -195 C. Shortening the gauge length from eight inches to one inch increased the strain to fracture and lowered the elastic modulus values.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-147115 , KD-75-9
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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