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Author Wood, F.E.; Cusanovich, M.A.
Title The reaction of Euglena gracilis cytochrome c-552 with nonphysiological oxidants and reductants Type Journal Article
Year 1975 Publication Archives of Biochemistry and Biophysics Abbreviated Journal
Volume 168 Issue 2 Pages (up) 333-342
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Abstract The reaction of Euglena gracilis cytochrome c-552 (cytochrome f) with the nonphysiological reactants potassium ferrocyanide, potassium ferricyanide, sodium ascorbate, sodium dithionite, and Chromatium vinosum high potential nonheme iron protein was studied by stopped-flow and temperature-jump kinetic methods. The reaction of the purified, water-soluble protein with the reactants was investigated as a function of ionic strength, pH, and temperature. The results demonstrated that reduction and oxidation takes place at a negatively charged site on the cytochrome c-552 surface. Participation of specific amino acid residues in electron transfer is implicated from the pH results. The results obtained for the nonphysiological reactions of cytochrome c-552 are compared with available data for horse heart cytochrome c and Rhodospirillum rubrum cytochrome c2. The results strongly suggest that Euglena gracilis cytochrome c-552 undergoes nonphysiological oxidation and reduction by a mechanism different from that found for cytochrome c or cytochrome c2.
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Notes Approved no
Call Number refbase @ user @ Serial 3987
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Author Zimen, E.
Title Social dynamics of the wolf pack Type Book Chapter
Year 1975 Publication The wild canids Abbreviated Journal
Volume Issue Pages (up) 336-362
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Publisher Van Nostrand Reinhold Place of Publication New York Editor Fox, M.W.
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Notes Approved no
Call Number Equine Behaviour @ team @ Serial 5231
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Author Scherer, W.F.; Madalengoitia, J.; Flores, W.; Acosta, M.
Title Ecologic studies of Venezuelan encephalitis virus in Peru during 1970-1971 Type Journal Article
Year 1975 Publication American Journal of Epidemiology Abbreviated Journal Am J Epidemiol
Volume 101 Issue 4 Pages (up) 347-355
Keywords Animals; Antibodies, Viral; Cricetinae/immunology; Culicidae/microbiology; *Disease Vectors; Ecology; *Encephalitis Virus, Venezuelan Equine/immunology/isolation & purification; Encephalomyelitis, Equine/immunology/microbiology/transmission; Female; Hemagglutination Inhibition Tests; Horses/immunology; Humans; Neutralization Tests; Peru
Abstract Venezuelan encephalitis (VE) virus has intermittently produced epidemics and equine epizootics on the dry Pacific coastal plain of Peru since at least the 1930's. However, evidence that the virus exists in the Amazon region of Peru to the east of the Andes mountains was not obtained until antibodies were found in human sera collected in 1965, and 10 strains of the virus were isolated in a forest near the city of Iquitos, Peru during February and March 1971. Eight strains came from mosquitoes and two from dead sentinel hamsters. Three hamsters exposed in forests near Iquitos developed VE virus antibodies suggesting that hamster-benign strains also exist there. Antibody tests of equine sera revealed no evidence that VE virus was actively cycling during the late 1950's or 1960's in southern coastal Peru, where equine epizootics had occurred in the 1930's and 1940's. In northern coastal Peru bordering Ecuador, antibodies were present in equine sera, presumably residual from the 1969 outbreak caused by subtype I virus, since neutralizing antibody titers were higher to subtype I virus than to subtypes III or IV. No VE virus was detected in this northern region during the dry season of 1970 by use of sentinel hamsters. The possibility is considered that VE epidemics and equine epizootics on the Pacific coast of Peru are caused by movements of virus in infected vertebrates traversing Andean passes or in infected vertebrates or mosquitoes carried in airplanes from the Amazon region.
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ISSN 0002-9262 ISBN Medium
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Notes PMID:235838 Approved no
Call Number Equine Behaviour @ team @ Serial 2705
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Author Owaga Ml,
Title The feeding ecology of wildbeest and zebra in Athi – Kaputei plains Type Journal Article
Year 1975 Publication Abbreviated Journal E Afr Wildl J
Volume 13 Issue Pages (up) 375-384
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1445
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Author FRASER AF et al,
Title An exploratory ultrasonic study on quntitative foetal kinesis in the horse Type Journal Article
Year 1975 Publication Abbreviated Journal Appl Anim Ethol
Volume 1 Issue Pages (up) 395-404
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1093
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Author Montagu I,
Title The wild ass of Africa Type Journal Article
Year 1975 Publication Abbreviated Journal Wild Life
Volume 17 Issue Pages (up) 400-401
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1409
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Author Douglas Rh, G.O.
Title Development of the equine fetus and placenta Type Journal Article
Year 1975 Publication Abbreviated Journal J Reprod Fert (Suppl)
Volume 23 Issue Pages (up) 495-498
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1023
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Author Niekerk Van Ch, A.W.
Title Early embryonic development in the horse Type Journal Article
Year 1975 Publication Abbreviated Journal J Reprod Fert Suppl
Volume 23 Issue Pages (up) 495-498
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1417
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Author Mitchell, D.; Allen, W. R.
Title Observations on reproductive performance in the yearling mare Type Journal Article
Year 1975 Publication Journal of Reproduction and Fertility Abbreviated Journal J. Reprod. Fert.,
Volume (Suppl. 23) Issue Pages (up) 531-536
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Abstract Reproductive performance was studied in 137 yearling mares run with stallions in small groups for 3 months between June and August in 1968 to 1971 (four breeding seasons). Pregnancy diagnosis by repeated rectal palpation and qualitative tests for PMSG, showed that ninety-five mares conceived of which forty-four aborted spontaneously between days 30 and 160 of gestation. Laboratory examination of twenty-one aborted fetuses failed to show any infectious agents. Serial quantitative and qualitative tests for PMSG in aborting animals gave results similar to those observed in mares with normal pregnancies. Plasma progestagen assays showed marked individual variations although the loss of the conceptus was always associated with a drop in progestagen level. The high incidence of early pregnancy loss in these pubertal mares may also be related to immaturity, inadequate nutrition and physical stress.
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Call Number Equine Behaviour @ team @ Serial 2378
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Author Czerlinski, G.H.; Wagner, M.; Erickson, J.O.; Theorell, H.
Title Chemical relaxation studies on the system liver alcohol dehydrogenase, NADH and imidazole Type Journal Article
Year 1975 Publication Acta Chemica Scandinavica. Series B: Organic Chemistry and Biochemistry Abbreviated Journal Acta Chem Scand B
Volume 29 Issue 8 Pages (up) 797-810
Keywords Alcohol Oxidoreductases/*metabolism; Animals; Computers; Hydrogen-Ion Concentration; Imidazoles/*metabolism; Kinetics; Liver/enzymology/*metabolism; Mathematics; Models, Chemical; NAD/*metabolism; Time Factors
Abstract Several years ago, Theorell and Czerlinski conducted experiments on the system of horse liver alcohol dehydrogenase, reduced nicotinamide adenine dinucleotide and imidazole, using the first version of the temperature jump apparatus with detection of changes in fluorescence. These early experiments were repeated with improved instrumentation and confirmed the early experiments in general terms. However, the improved detection system allowed to measure a slight concentration dependence of the relaxation time of around 3 ms. Furthermore, the chemical relaxation time was smaller than the one determined earlier (by factor 2). The data were evaluated much more rigorously than before, allowing an appropriate interpretation of the results. The observed relaxation time is largely due to rate constants in an interconversion of ternary complexes, which are faster than three (of the four) dissociation rate constants, determined previously by Theorell and McKinley-McKee.1,2 This fact contributed to earlier difficulties of finding any concentration dependence. However, the binding of imidazole to the binary enzyme-coenzyme complex can be made to couple kinetically into the interconversion rate of the two ternary complexes. The observed signal derives largely from the ternary complex(es). A substantial fluorescence signal change is associated with the observed relaxation process, suggesting a relocation of the imidazole in reference to the nicotinamide moiety of the bound coenzyme. Nine models are considered with two types of coupling of pre-equilibria (none-all). Quantitative evaluations favor the model with two ternary complexes connected by an interconversion outside the four-step (bimolecular) cycle. The ternary complex outside the cycle has much higher fluorescence yield than the one inside. The interconversion equilibrium is near unity for imidazole. If it would be shifted very much to the side of the “dead-end” complex (as in isobutyramide?!), stimulating action could not take place.
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ISSN 0302-4369 ISBN Medium
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Notes PMID:882 Approved no
Call Number refbase @ user @ Serial 3887
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