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Author |
Steinhoff, H.J.; Lieutenant, K.; Redhardt, A. |
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Title |
Conformational transition of aquomethemoglobin: intramolecular histidine E7 binding reaction to the heme iron in the temperature range between 220 K and 295 K as seen by EPR and temperature-jump measurements |
Type |
Journal Article |
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Year |
1989 |
Publication |
Biochimica et Biophysica Acta |
Abbreviated Journal |
Biochim Biophys Acta |
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Volume |
996 |
Issue |
1-2 |
Pages |
49-56 |
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Keywords |
Animals; Electron Spin Resonance Spectroscopy; Heme; Histidine; Horses; Humans; Hydrogen-Ion Concentration; Methemoglobin/*ultrastructure; Motion; Protein Conformation; Temperature; Thermodynamics; Water |
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Abstract |
Temperature-dependent EPR and temperature-jump measurements have been carried out, in order to examine the high-spin to low-spin transition of aquomethemogobin (pH 6.0). Relaxation rates and equilibrium constants could be determined as a function of temperature. As a reaction mechanism for the high-spin to low-spin transition, the binding of N epsilon of His E7 to the heme iron had been proposed; the same mechanism had been suggested for the ms-effect, found in temperature-jump experiments on aquomethemoglobin. A comparison of the thermodynamic quantities, deduced form the measurements in this paper, gives evidence that indeed the same reaction is investigated in both cases. Our results and most of the findings of earlier studies on the spin-state transitions of aquomethemoglobin, using susceptibility, optical, or EPR measurements, can be explained by the transition of methemoglobin with H2O as ligand (with high-spin state at all temperatures) and methemoglobin with ligand N epsilon of His E7 (with a low-spin ground state). Thermal fluctuations of large amplitude have to be postulated for the reaction to take place, so this reaction may be understood as a probe for the study of protein dynamics. |
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Institut fur Biophysik, Ruhr-Universitat Bochum, F.R.G |
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0006-3002 |
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PMID:2544230 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
3803 |
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Author |
Konstantinov, S.A.; Veselkin, A.G. |
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Title |
[The intensity and efficiency of a gadfly attack on cattle depending on the number and location of the animals in the herd] |
Type |
Journal Article |
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Year |
1989 |
Publication |
Parazitologiia |
Abbreviated Journal |
Parazitologiia |
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Volume |
23 |
Issue |
1 |
Pages |
3-10 |
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Keywords |
Animals; Cattle/*parasitology; Diptera/*physiology; Ecology; Insect Bites and Stings/parasitology/*veterinary; Russia |
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Abstract |
The effect of group was studied on cattle being attacked by horse flies of three genera. The method of simultaneous registrations of attacking horse flies in herds of 8 to 100 animals and on single cows was used. It has been shown that the effect of group reveals itself only when animals in the herd reach a certain minimum number, the effect rate depending on peculiarities of attacking of a given species of bloodsuckers, such as a part of responding individuals, distance of an attack, duration of contact with an object. These parameters tend to change with increasing number of animals in the herd. Therefore differences in the intensity of attacks on herds with different cattle stock cannot be explained proceeding only from differences in the occupied areas. The number of attacking horse flies decreases from the periphery of the herd to its centre and is not the same in different parts of the periphery. The effectiveness of attacking, ie the part of sucking individuals of a given species (genus) from the number of horse flies attacking for a definite period of time, is the highest in a large herd and increases in its ranges from the periphery to the centre. This dependence leads to a more even distribution of sucking individuals as compared to attacking ones. |
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Russian |
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Original Title |
Intensivnost' i effektivnost' napadeniia slepnei na krupnyi rogatyi skot v zavisimosti ot chisla i mestopolozheniia zhivotnykh v stade |
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0031-1847 |
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PMID:2524028 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
2674 |
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Author |
Stahlbaum, C.C.; Houpt, K.A. |
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Title |
The role of the Flehmen response in the behavioral repertoire of the stallion |
Type |
Journal Article |
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Year |
1989 |
Publication |
Physiology & behavior |
Abbreviated Journal |
Physiol. Behav. |
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Volume |
45 |
Issue |
6 |
Pages |
1207-1214 |
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Keywords |
Animals; Behavior, Animal/*physiology; Circadian Rhythm; Discrimination (Psychology)/physiology; Estrus; Feces; Female; Horses/*physiology; Male; Sexual Behavior, Animal/*physiology; Smell/*physiology; Taste/physiology; Urine |
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Abstract |
The role of the Flehmen response in equine behavior was investigated under field and laboratory conditions. In Experiment 1, a field study made of five stallions on pasture with between three and eighteen mares each during the season indicated the following: 1) The Flehmen response was most frequently preceded by nasal, rather than oral, investigation of substances; 2) The stallions' rate of Flehmen varied with the estrous cycles of the mares; 3) The rate of Flehmen response did not show a variation with time of day; and 4) The Flehmen response was most frequently followed by marking behaviors rather than courtship behaviors. The results suggest that the Flehmen response is not an immediate component of sexual behavior, e.g., courtship of the stallion but may be involved in the overall monitoring of the mare's estrous cycle. Therefore the Flehmen response may contribute to the chemosensory priming of the stallion for reproduction. In Experiment 2 stallions were presented with urine or feces of mares in various stages of the reproductive cycle as well as with their own or other males' urine or feces. The occurrence of sniffing and Flehmen was used to determine the discriminatory ability of the stallions. Stallions can differentiate the sex of a horse on the basis of its feces alone, but cannot differentiate on the basis of urine. This ability may explain the function of fecal marking behavior of stallions. |
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Address |
New York State College of Veterinary Medicine, Cornell University, Ithaca 14853 |
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English |
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ISSN |
0031-9384 |
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Notes |
PMID:2813545 |
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no |
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Call Number |
refbase @ user @ |
Serial |
44 |
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Author |
Houpt, K.A.; Thornton, S.N.; Allen, W.R. |
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Title |
Vasopressin in dehydrated and rehydrated ponies |
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Journal Article |
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Year |
1989 |
Publication |
Physiology & behavior |
Abbreviated Journal |
Physiol. Behav. |
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Volume |
45 |
Issue |
3 |
Pages |
659-661 |
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Keywords |
Animals; Behavior, Animal/*physiology; Dehydration/*blood; Drinking Behavior/*physiology; Female; Horses/*blood; Osmolar Concentration; Reaction Time; Time Factors; Vasopressins/*blood |
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Abstract |
Six pony mares deprived of water for 24 hours showed significant increases in plasma vasopressin (2.8 pg/ml) and osmolality (9 mosmol/kg). When water was made available the ponies drank rapidly (5 of 6 drank to satiety within 90 seconds) and corrected their fluid deficits precisely. Vasopressin did not return to predehydration levels until osmolality did after 15 minutes of access to water. The horse differs from rodents and humans, but is similar to pigs in that vasopressin levels do not fall before osmolality returns to normal. Oropharyngeal factors, therefore, may not be as important in vasopressin release in horses as in other species. |
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New York State College of Veterinary Medicine, Cornell University, Ithaca 14853-6401 |
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0031-9384 |
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Notes |
PMID:2756059 |
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no |
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Call Number |
refbase @ user @ |
Serial |
45 |
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Author |
Galdikas, B.M. |
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Title |
Orangutan tool use |
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Journal Article |
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Year |
1989 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
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Volume |
243 |
Issue |
4888 |
Pages |
152 |
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Keywords |
Animals; Animals, Wild; *Behavior, Animal; Cognition; *Hominidae; Humans; *Pongo pygmaeus |
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English |
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0036-8075 |
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Notes |
PMID:2911726 |
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no |
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Call Number |
Equine Behaviour @ team @ |
Serial |
2847 |
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Author |
Herder, S.L. |
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Title |
More cardiac dressage: galop, gallop, gal(l)opitty glop |
Type |
Journal Article |
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Year |
1989 |
Publication |
JAMA : the Journal of the American Medical Association |
Abbreviated Journal |
Jama |
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Volume |
262 |
Issue |
3 |
Pages |
352 |
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Keywords |
Animals; Gait; *Heart Rate; Horses; Humans; Terminology; *Wit and Humor |
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English |
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ISSN |
0098-7484 |
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Notes |
PMID:2739033 |
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no |
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Call Number |
Equine Behaviour @ team @ |
Serial |
3757 |
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Author |
Kondo, S.; Sekine, J.; Okubo, M.; Asahida, Y. |
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Title |
The effect of group size and space allowance on the agonistic and spacing behavior of cattle |
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Journal Article |
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Year |
1989 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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Volume |
24 |
Issue |
2 |
Pages |
127-135 |
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Abstract |
The number of agonistic encounters in a group (frequency per h) and the mean distance to the nearest neighbor in a group (m) were analyzed by a multiple regression on the group size (number of animals in a group) and space allowance (m3 per animal) in each group of calves (6–13 months old, Holstein female and castrated male) and adult cattle (2–12 years old, Holstein heifers and cows or Holstein and Hereford grazing beef cattle). A total of 196 calves and 602 adult animals were used in this analysis. In calves, a significant correlation was found between agonistic behavior and space allowance (r=-0.48, P<0.01), but not between agonistic behavior and group sizes. The mean distance to the nearest neighbor in calf groups increased as the group size decreased and space allowance increased (R2=0.66, P<0.01). In adult cattle, the number of agonistic encounters increased linearly as the group size increased (r=+0.37, P<0.05). The relationship between agonistic behavior and 1(space allowance)2 was significant (r=+0.48, P<0.05). The mean distance to the nearest neighbor tended to increase as the group size decreased and the space allowance increased (R2=0.68, P<0.01). When the space allowance increased beyond 360 m2 per animal, the average distance to the nearest neighbor in the adult group was maintained within the range of 10–12 m. |
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ISSN |
0168-1591 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
5473 |
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Author |
Galef, B.G. |
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Title |
Enduring social enhancement of rats' preferences for the palatable and the piquant |
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Journal Article |
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Year |
1989 |
Publication |
Appetite |
Abbreviated Journal |
Appetite |
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Volume |
13 |
Issue |
2 |
Pages |
81-92 |
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Abstract |
In three experiments on the social induction of food preferences in rats, I found: (a) that eight 30-min exposures of a naive “observer” rat to a “demonstrator” rat fed one of two approximately equipalatable diets produced observer preference for the diet fed to its demonstrator that lasted for more than a month, (b) that simple exposure of naive subjects to a diet itself, rather than to a rat that had eaten a diet, was not sufficient to enhance preference for that diet, and (c) that lasting preference for an unpalatable, piquant diet could also be established by exposing naive rats to demonstrators that had eaten the piquant diet, but not by simply exposure to the piquant diet itself. These findings are consistent with the hypothesis proposed by both Birch and Rozin that social-affective contexts are important in establishing stable, learned preferences for foods. |
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ISSN |
0195-6663 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
6567 |
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Author |
Hutchinson, G.W.; Abba, S.A.; Mfitilodze, M.W. |
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Title |
Seasonal translation of equine strongyle infective larvae to herbage in tropical Australia |
Type |
Journal Article |
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Year |
1989 |
Publication |
Veterinary Parasitology |
Abbreviated Journal |
Vet Parasitol |
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Volume |
33 |
Issue |
3-4 |
Pages |
251-263 |
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Keywords |
Animals; Feces/*parasitology; Horses; Queensland; Seasons; Strongyle Infections, Equine/*parasitology; Strongyloidea/growth & development/*physiology; Strongylus/growth & development/*physiology; Tropical Climate |
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Abstract |
Longevity in faeces, migration to and survival on herbage of mixed strongyle infective larvae (approximately 70% cyathostomes: 30% large strongyles) from experimentally deposited horse faeces was studied in the dry tropical region of North Queensland for up to 2 years. Larvae were recovered from faeces deposited during hot dry weather for a maximum of 12 weeks, up to 32 weeks in cool conditions, but less than 8 weeks in hot wet summer. Translation to herbage was mainly limited to the hot wet season (December-March), except when unseasonal winter rainfall of 40-50 mm per month in July and August allowed some additional migration. Survival on pasture was estimated at 2-4 weeks in the summer wet season and 8-12 weeks in the autumn-winter dry season (April-August). Hot dry spring weather (pre-wet season) was the most unfavourable for larval development, migration and survival. Peak counts of up to 60,000 larvae kg-1 dry herbage were recorded. The seasonal nature of pasture contamination allowed the development of rational anthelmintic control programs based on larval ecology. |
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Graduate School of Tropical Veterinary Science, James Cook University of North Queensland, Townsville, Australia |
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English |
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Edition |
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ISSN |
0304-4017 |
ISBN |
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Notes |
PMID:2815535 |
Approved |
no |
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Call Number |
Equine Behaviour @ team @ |
Serial |
2672 |
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Author |
Lloyd, P.H.; Rasa, O.A.E. |
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Title |
Status, reproductive success and fitness in Cape mountain zebra (Equus zebra zebra) |
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Journal Article |
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Year |
1989 |
Publication |
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Abbreviated Journal |
Behavioral Ecology and Sociobiology |
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Volume |
25 |
Issue |
6 |
Pages |
411-420 |
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Abstract |
Demographic data relating to herd size and stability are given for a population of Cape mountain zebra (Equus zebra zebra) under longterm observation. Temporal dispersion patterns of male and female offspring differed and were independent of the mother's status. Dispersion in females appeared to be related to physiological state, and dispersion in both sexes was related to age rather than changes in parental behaviour. Reproductive success of dominant and subordinate mares was equal and independent of age and social and reproductive variables. Fitness of dominant mares, however, was significantly higher than that of subordinates, the latter having a higher foal mortality, part of which could be attributable to dominants' aggression. The fitness of all males born was 1.6:1 compared with all females. Dominant mares produced significantly more daughters than sons. This trend was not found for subordinates. Mother's status was positively correlated with dominant status in her female offspring but not related to the subsequent status of her sons. Daughters had a more than twice as great a chance of breeding than sons. For maximum fitness gains, therefore, dominant mares should produce more daughters, since a high proportion of these would also have high status and fitness. This tendency is reflected in the sex ratio skewed towards females found for dominant mares. |
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Publisher |
Springer-Verlag |
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English |
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Edition |
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ISSN |
0340-5443 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
5787 |
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