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  • Molecular Sequence Data  (2)
  • Respiratory chains  (2)
  • extinguishment  (2)
  • Springer  (4)
  • American Association for the Advancement of Science (AAAS)  (2)
  • Geological Society of London
  • National Academy of Sciences
  • Springer Nature
  • 1985-1989  (6)
Collection
Keywords
Publisher
  • Springer  (4)
  • American Association for the Advancement of Science (AAAS)  (2)
  • Geological Society of London
  • National Academy of Sciences
  • Springer Nature
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Flame extinguishment properties of dry chemicals: Extinction concentrations for small diffusion pan fires (1989)
    Springer
    Fire technology 25 (1989), S. 134-149 
    Details
    ISSN: 1572-8099
    Keywords: Flame ; extinguishment ; extinction ; diffusion flames ; dry chemicals ; hydrocarbon-air
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract An extensive experimental study has been made of the extinguishment of a smalln-heptane diffusion flame (14.7 cm diameter pan) by five common dry-chemical powders—potassium bicarbonate, sodium bicarbonate, potassium chloride, monoammonium phosphate, and Monnex. The fire extinguishing effectiveness (reciprocal of the observed minimum extinction concentration) of each dry-chemical substance, other than that due to chemical specificity, is fully explained on the basis of particle size and distribution. Literature correlations between effectiveness and particle surface area appear to be incidental and stem from the inherent relationship between particle size and surface area. An important finding of the study is a discontinuity in the extinguishing effectiveness of a powder as a function of particle size. This occurs for each substance at a unique particle diameter above which there is a dramatic five-to eight-fold decrease in effectiveness. For a given substance, all powders with particle sizes below the limiting value exhibit the same maximum effectiveness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041422
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence for flame extinguishment by thermal mechanisms (1989)
    Springer
    Fire technology 25 (1989), S. 195-212 
    Details
    ISSN: 1572-8099
    Keywords: physical ; thermal ; mechanisms ; flame ; fire ; extinguishment ; hydrocarbonair
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract This paper presents an analysis of experimental flame and detonation extinguishment data published by a number of authors, including those in a companion paper. The maximum effectiveness observed for each of five common dry chemicals at small particle diameters is shown to be related to heat extraction from the flame by active endothermic sinks—heat capacity, fusion, vaporization, and decomposition. Larger particles are more stable in the flame and the reduced level of effectiveness observed is due principally to the only active sink—heat capacity. Evidence is presented to support two propositions: first, that the strong chemical inhibiting effects exhibited by many substances in flame velocity studies are effectively confined to low-concentration regimes; and second, that regardless of chemical effects, diffusion flames of the type studied are largely extinguished by thermal or heat extraction mechanisms at extinguishant concentrations that are quantitatively predicted by a simple heat balance and a predictable limit temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01039778
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of iron-limitation ofEscherichia coli on growth, the respiratory chains and gallium uptake (1986)
    Springer
    Archives of microbiology 146 (1986), S. 80-86 
    Details
    ISSN: 1432-072X
    Keywords: Iron-limitation ; Escherichia coli ; Respiratory chains ; Cytochromes ; Gallium ; Metal uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of iron limitation on growth, the composition and function of the respiratory chains, and gallium uptake inEscherichia coli have been studied. Decreasing the iron concentration in a defined medium using Chelex resin gave lower growth yields in both continuous culture and prolonged batch culture. In the former, ironlimited (entering [Fe]≤2.0 μM) cells exhibited diminished respiration rates, respiration-driven proton translocation quotients, and levels of non-haem iron and cytochromes. The cellular concentration of haemoproteinb-590 (a cytochromea 1-like hydroperoxidase) decreased 20-fold on iron limitation, whilst a CO-binding pigment with an absorption maximum in the dithionite-treated form near 500 nm appeared. Gallium(III) (9 μM) added to iron-limited, but not iron-sufficient, cultures diminished growth yields further; cells grown with low entering concentrations of iron took up less gallium than iron-sufficient cells. These results are attributed to the interference by gallium(III) with siderophore-mediated metal uptake. Gallium also stimulated iron uptake and was itself accumulated by iron-sufficient cells, suggesting that gallium(III) also affects the iron transport system(s) of low affinity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690163
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of copper concentration in continuous culture on the aa 3-type cytochrome oxidase and respiratory chains of Paracoccus denitrificans (1989)
    Springer
    Archives of microbiology 151 (1989), S. 300-306 
    Details
    ISSN: 1432-072X
    Keywords: Copper-limitation ; Escherichia coli ; Cytochrome oxidases ; Oxygen reduction ; Respiratory chains
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The role(s) of copper in a bacterial cytochrome oxidase of the aa 3-type was investigated by growth of Paracoccus denitrificans NCIB 8944, in batch and steady state continuous culture, in a medium from which the bulk of the copper had been extracted. In a medium containing approximately 0.02 μM copper, cellular copper content, cytochromes a+a 3 and cytochrome a 3 were reduced to 55%, 58% and 33% respectively of control values and there were also less marked decreases in cytochromes c+c 1 (to 85%) and a CO-binding b-type cytochrome, possibly cytochrome o (to 71%). Copper deficiency elicited in reduced minus oxidized difference spectra a shift to shorter wavelengths and narrowing of the band width of the α-band of the oxidase, and loss of a (negative) band near 830 nm attributable to CuA (the copper functionally associated with haem a in the oxidase complex). The oxidase in copper-deficient cells reacted with oxygen to form the oxy “Compound A” at rates similar to that in control cells but CO recombination to ferrous haem a 3 was slowed 4-fold in the copper deficient case. The results are interpreted as indicating loss of CuA and changes in the proportions of haems a and a 3 with retention of catalytic activity. Titrations of respiration rates with antimycin suggested that copper deficiency did not result in diversion of electron flux through an antimycin A-insensitive, cytochrome o-terminated branch of the respiratory chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406555
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  • 5
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    The neuron-specific protein PGP 9.5 is a ubiquitin carboxyl-terminal hydrolase (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-11-03
    Description: A complementary DNA (cDNA) for ubiquitin carboxyl-terminal hydrolase isozyme L3 was cloned from human B cells. The cDNA encodes a protein of 230 amino acids with a molecular mass of 26.182 daltons. The human protein is very similar to the bovine homolog, with only three amino acids differing in over 100 residues compared. The amino acid sequence deduced from the cDNA was 54% identical to that of the neuron-specific protein PGP 9.5. Purification of bovine PGP 9.5 confirmed that it is also a ubiquitin carboxyl-terminal hydrolase. These results suggest that a family of such related proteins exists and that their expression is tissue-specific.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilkinson, K D -- Lee, K M -- Deshpande, S -- Duerksen-Hughes, P -- Boss, J M -- Pohl, J -- New York, N.Y. -- Science. 1989 Nov 3;246(4930):670-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2530630" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; B-Lymphocytes/enzymology ; Base Sequence ; Cattle ; DNA/genetics ; Humans ; Isoenzymes/genetics ; Molecular Sequence Data ; Neuropeptides/*genetics/isolation & purification ; Sequence Homology, Nucleic Acid ; Thiolester Hydrolases/*genetics/isolation & purification ; Ubiquitin Thiolesterase
    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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  • 6
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    Point mutations in the human vitamin D receptor gene associated with hypocalcemic rickets (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-23
    Description: Hypocalcemic vitamin D-resistant rickets is a human genetic disease resulting from target organ resistance to the action of 1,25-dihydroxyvitamin D3. Two families with affected children homozygous for this autosomal recessive disorder were studied for abnormalities in the intracellular vitamin D receptor (VDR) and its gene. Although the receptor displays normal binding of 1,25-dihydroxyvitamin D3 hormone, VDR from affected family members has a decreased affinity for DNA. Genomic DNA isolated from these families was subjected to oligonucleotide-primed DNA amplification, and each of the nine exons encoding the receptor protein was sequenced for a genetic mutation. In each family, a different single nucleotide mutation was found in the DNA binding domain of the protein; one family near the tip of the first zinc finger (Gly----Asp) and one at the tip of the second zinc finger (Arg----Gly). The mutant residues were created in vitro by oligonucleotide directed point mutagenesis of wild-type VDR complementary DNA and this cDNA was transfected into COS-1 cells. The produced protein is biochemically indistinguishable from the receptor isolated from patients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hughes, M R -- Malloy, P J -- Kieback, D G -- Kesterson, R A -- Pike, J W -- Feldman, D -- O'Malley, B W -- New York, N.Y. -- Science. 1988 Dec 23;242(4886):1702-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Baylor College of Medicine, Houston, TX 77030.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2849209" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Calcitriol/metabolism ; Cell Line ; Cell Line, Transformed ; Codon ; DNA/genetics/metabolism ; Exons ; Female ; Gene Amplification ; Homozygote ; Humans ; Hypocalcemia/*genetics ; Immunoblotting ; Male ; Molecular Sequence Data ; *Mutation ; Receptors, Calcitriol ; Receptors, Steroid/*genetics/metabolism ; Rickets/*genetics ; Transfection
    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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