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Author |
Krzeminska, W. |
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Title |
[The child learns about the world] |
Type |
Journal Article |
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Year |
1979 |
Publication  |
Pielegniarka i polozna |
Abbreviated Journal |
Pieleg Polozna |
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Volume |
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Issue |
7 |
Pages |
24-25 |
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Keywords |
Child; *Child Development; Child, Preschool; Humans; *Learning |
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Polish |
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Original Title |
Dziecko poznaje swiat |
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ISSN |
0048-4148 |
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Notes |
PMID:260249 |
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Call Number |
refbase @ user @ |
Serial |
43 |
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Author |
Czerlinski, G.H.; Erickson, J.O.; Theorell, H. |
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Title |
Chemical relaxation studies on the horse liver alcohol dehydrogenase system |
Type |
Journal Article |
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Year |
1979 |
Publication |
Physiological Chemistry and Physics |
Abbreviated Journal |
Physiol Chem Phys |
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Volume |
11 |
Issue |
6 |
Pages |
537-569 |
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Keywords |
Alcohol Oxidoreductases/*metabolism; Animals; Buffers; Electron Transport; Ethanol/metabolism; Horses; Hydrogen-Ion Concentration; Liver/*enzymology; Mathematics; NAD/metabolism; Oscillometry; Osmolar Concentration; Temperature; Time Factors |
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Abstract |
Chemical relaxation studies on the system horse liver alcohol dehydrogenase, nicotinamide adenine dinucleotide, and ethanol were conducted observing fluorescence changes between 400 and 500 nm. Temperature-jump experiments were performed at pH 6.5, 7.0, 8.0, and 9.0; concentration-jump experiments at pH 9.0. The reciprocal of the slowest relaxation time was found to be linearly dependent upon the enzyme concentration for relatively low enzyme concentrations, as predicted earlier. Use of the wide pH-range necessitated expression of the four apparent dissociation constants of the catalytic reaction cycle in terms of pH-independent constants. The system was described in terms of only one (or two) catalysis-linked protons not associated with the electron transfer. Protonic steps in a buffered system are in rapid equilibrium, too fast to be measured with the equipment available. Assuming only two of the four bimolecular reaction steps in the four-step cycle are fast compared to the remaining two, six cases may be considered with six expressions for the reciprocal of the slowest relaxation time. Comparison with the experimental data revealed that the bimolecular reaction steps governing the slowest relaxation time change with pH. Above the effective time resolution of the temperature-lump instrument with fluorescence detection (0.1 msec) only one other relaxation time was detectable and only at pH 9. This relaxation time, found to be independent of the concentration of all reactants within experimental error (r = 10 +/- 5 msec), is most likely due to an interconversion among ternary complexes. |
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English |
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ISSN |
0031-9325 |
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Notes |
PMID:44918 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
3813 |
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Author |
Gates, S. |
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Title |
A Study of home ranges of free ranging Exmoore ponies |
Type |
Journal Article |
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Year |
1979 |
Publication |
Mammal Revision |
Abbreviated Journal |
Mamm. Rev. |
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Volume |
9 |
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Pages |
:3-18 |
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no |
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Call Number |
refbase @ user @ |
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765 |
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Author |
Wilson, M.T.; Silvestrini, M.C.; Morpurgo, L.; Brunori, M. |
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Title |
Electron transfer kinetics between Rhus vernicifera stellacyanin and cytochrome c (horse heart cytochrome c and Pseudomonas cytochrome c551) |
Type |
Journal Article |
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Year |
1979 |
Publication |
Journal of Inorganic Biochemistry |
Abbreviated Journal |
J Inorg Biochem |
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Volume |
11 |
Issue |
2 |
Pages |
95-100 |
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Keywords |
Animals; Copper; Cytochrome c Group/*metabolism; Electron Transport; Kinetics; Metalloproteins/*metabolism; Plant Proteins/*metabolism; *Plants, Toxic; Pseudomonas aeruginosa/*metabolism; Toxicodendron/*metabolism |
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Abstract |
The electron transfer reactions between Rhus vernicifera stellacyanin and either horse heart cytochrome c or Pseudomonas aeruginosa cytochrome c551 were investigated by rapid reaction techniques. The time course of electron transfer is monophasic under all conditions, and thus consistent with a simple formulation of the reaction. Both stopped-flow and temperature-jump experiments yield equilibrium constants in reasonable agreement with values calculated from the redox potentials. The differences in reaction rate between the two cytochromes and stellacyanin are discussed in terms of the Marcus theory. |
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ISSN |
0162-0134 |
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Notes |
PMID:228006 |
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no |
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Call Number |
refbase @ user @ |
Serial |
3879 |
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Author |
Fiske, J.C.; Potter, G.D. |
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Title |
Discrimination reversal learning in yearling horses |
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Journal Article |
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Year |
1979 |
Publication |
J. Anim. Sci. |
Abbreviated Journal |
J. Anim. Sci. |
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Volume |
49 |
Issue |
2 |
Pages |
583-588 |
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Abstract |
Twenty-six yearling horses were tested on a serial reversal learning discrimination combining spatial and brightness cues. An original discrimination of rewarded or nonrewarded stimuli was made followed by 20 daily reversals for position/brightness discrimination. Learning criteria were defined as 11 out of 12 correct, with the last eight responses all correct. Each horse was allowed 30 trials per discrimination to achieve criteria. Mean errors (ME) and mean trials (MT) required to achieve criteria were computed for each horse. A relative learning ability index (LAI) was calculated by the formula 1000/MT/ME. A daily emotionality score, based on a scale of one (tranquil) to six (very excitable) was assigned each horse each day after testing and a mean computed for each horse. A single subjective trainability score, based on a scale of one (difficult to train) to six (easy to train) was obtained for each horse from an independent trainer. Linear regression analyses for all 26 horses revealed a reduction in MT and ME (P<.01) over the 21-day test period indicating evidence of learning to learn. Differences (P<.05) were evident between sexes for MT and ME. Significant correlations between trainability scores and learning ability indices MT, ME, and LAI were evident for colts and geldings but not for fillies. Pooled data showed significant correlations between ME and trainability. There was a negative correlation (P<.05) between emotionality and trainability scores for all 26 horses, although the filly group did not exhibit significant correlation between these parameters. |
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Notes |
Cited By (since 1996): 31; Export Date: 24 October 2008 |
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Call Number |
Admin @ knut @ |
Serial |
4583 |
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Author |
Asa, C.S.; Goldfoot, D.A.; Ginther, O.J. |
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Title |
Sociosexual behavior and the ovulatory cycle of ponies (Equus caballus) observed in harem groups |
Type |
Journal Article |
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Year |
1979 |
Publication |
Hormones and Behavior |
Abbreviated Journal |
Horm Behav |
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Volume |
13 |
Issue |
1 |
Pages |
49-65 |
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Abstract |
Observations of sociosexual behavior of adult ponies, made on two harem groups (each comprised of one vasectomized male and three females), were correlated with follicular development and ovulation for a total of 15 cycles (minimum of 2 cycles per female). Mean cycle length (interovulatory interval) was found to be 19.7 days, with behavioral estrus lasting 7-8 days (5.5 days preovulatory; 2.3 days postovulatory). Estrous females typically showed increased frequencies of approaching and following the stallion, urinating, presenting, clitoral winking, and tail raising. Approaching and following the stallion appeared earlier and persisted longer than other estrous responses. Deviations from the modal estrous pattern included cycles with subestrus, continual estrus, behavioral estrus in the absence of ovulation, and displays of female mounting. Dominance tests revealed that a mare's status was unaffected by the phases of the estrous cycle. The presence of more than one estrous female affected the copulatory performance of both stallions, most notably in reduced latencies to first mount, intromission, and ejaculation, in spite of differences between the stallions in sexual vigor. Each stallion usually selected the dominant mare for copulation when there were multiple estrous females present, but mounts were not displayed exclusively to one female per test. The social testing situation made apparent the importance of use of space in sociosexual communication in this species, particularly in avoidance of the stallion by diestrous mares and standing alone or in proximity to him by estrous mares. |
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ISSN |
0018-506x |
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Equine Behaviour @ team @ |
Serial |
5363 |
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Author |
Bouman Jg, |
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Title |
A possible stallion exchange strategy in order to decrease inbreeding in the Przewalski horse |
Type |
Book Chapter |
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Year |
1979 |
Publication |
Genetics and Hereditary Diseases of the Przewalski horse |
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Pages |
119 |
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Abstract |
Boer, Leobert E.M. de, and Jan & Inge Bouman, eds. Genetics and Hereditary Diseases of the Przewalski Horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse 1979. 176p, several photos and charts. Reproduced from typescript, as issued. Very good paperbound (covers shelf-soiled). ** Publishes 18 papers given at the Arnhem Study-Conference of 1978, on many aspects of breeding Przewalski horses, their behavior, etc. |
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Publisher |
er Foundation for the Preservation and Protection of the Przewalski Horse |
Place of Publication |
Rotterdam |
Editor |
de Boer, L.E.M. ; Bouman,J; Bouman, I |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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954 |
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Author |
Bouman Jg, |
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Title |
Does inbreeding ocur in free living horses? |
Type |
Book Chapter |
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Year |
1979 |
Publication |
Genetics and Hereditary Diseases of the Przewalski horse |
Abbreviated Journal |
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Pages |
125-132 |
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Abstract |
Boer, Leobert E.M. de, and Jan & Inge Bouman, eds. Genetics and Hereditary Diseases of the Przewalski Horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse 1979. 176p, several photos and charts. Reproduced from typescript, as issued. Very good paperbound (covers shelf-soiled). ** Publishes 18 papers given at the Arnhem Study-Conference of 1978, on many aspects of breeding Przewalski horses, their behavior, etc. |
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Foundation for the Preservation and Protection of the Przewalski Horse |
Place of Publication |
Rotterdam |
Editor |
de Boer, L.E.M. ; Bouman,J; Bouman, I |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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956 |
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Author |
Bouman-Heinsdijk I, |
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Title |
Does inbreeding occur in free living horses? |
Type |
Book Chapter |
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Year |
1979 |
Publication |
Genetics and Hereditary Diseases of the Przewalski Horse |
Abbreviated Journal |
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Abstract |
Boer, Leobert E.M. de, and Jan & Inge Bouman, eds. Genetics and Hereditary Diseases of the Przewalski Horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse 1979. 176p, several photos and charts. Reproduced from typescript, as issued. Very good paperbound (covers shelf-soiled). ** Publishes 18 papers given at the Arnhem Study-Conference of 1978, on many aspects of breeding Przewalski horses, their behavior, etc. |
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Publisher |
Foundation for the Preservation and Protection of the Przewalski Horse |
Place of Publication |
Rotterdam |
Editor |
de Boer, L.E.M. ; Bouman,J; Bouman, I |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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958 |
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Author |
Bouman Jg, |
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Title |
Breeding Przewalski horse in captivity |
Type |
Book Chapter |
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Year |
1979 |
Publication |
Genetics and Herdeditary Diseases of the Przewalski horse |
Abbreviated Journal |
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Abstract |
Boer, Leobert E.M. de, and Jan & Inge Bouman, eds. Genetics and Hereditary Diseases of the Przewalski Horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski Horse 1979. 176p, several photos and charts. Reproduced from typescript, as issued. Very good paperbound (covers shelf-soiled). ** Publishes 18 papers given at the Arnhem Study-Conference of 1978, on many aspects of breeding Przewalski horses, their behavior, etc. |
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Publisher |
Foundation for the Preservation and Protection of the Przewalski Horse |
Place of Publication |
Rotterdam |
Editor |
de Boer, L.E.M. ; Bouman,J; Bouman, I |
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Notes |
from Professor Hans Klingels Equine Reference List |
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955 |
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