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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 |
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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 @ |
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3803 |
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Author |
Herder, S.L. |
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Title |
More cardiac dressage: galop, gallop, gal(l)opitty glop |
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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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0098-7484 |
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PMID:2739033 |
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Equine Behaviour @ team @ |
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3757 |
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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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Animals; Animals, Wild; *Behavior, Animal; Cognition; *Hominidae; Humans; *Pongo pygmaeus |
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0036-8075 |
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PMID:2911726 |
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Equine Behaviour @ team @ |
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2847 |
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Author |
Cheney, D.L.; Seyfarth, R.M. |
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Title |
Reconciliation and redirected aggression in vervet monkeys, Behaviour |
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Journal Article |
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Year |
1989 |
Publication |
Behaviour |
Abbreviated Journal |
Behaviour |
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110 |
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258-275 |
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Equine Behaviour @ team @ |
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4865 |
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Author |
Fragaszy, D.M.; Visalberghi E. |
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Title |
Social influences on the acquisition of tool-using behaviors in tufted capuchin monkeys (Cebus apella) |
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Journal Article |
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Year |
1989 |
Publication |
Journal of Comparative Psychology |
Abbreviated Journal |
J. Comp. Psychol. |
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103 |
Issue |
2 |
Pages |
159-170 |
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To identify behaviors related to acquisition of tool-use in tufted capuchins (Cebus apella), we presented two tool-using tasks to two groups, extending findings by Westergaard and Fragaszy (1987) and Visalberghi (in press). Five Ss learned to use the tools in each task. The primary predictor of success was level of interest in the task. Observation of others at the apparatus did not facilitate exploratory behaviors or contact with the tools in the observers. Most animals performed exploratory behaviors more often when they were at the apparatus alone than when with another, whether or not the other was using a tool. Observers were quick to learn the relationship between another's activities and the appearance of food. We conclude that capuchins do not readily learn about instrumental relations by observation of others or imitate other's acts. Imitation probably plays no role in the spread of novel instrumental behaviors among monkeys. (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
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social influences, acquisition of tool using |
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Equine Behaviour @ team @ |
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2993 |
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Author |
Povinelli DJ |
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Title |
Failure to find self-recognition in Asian elephants (Elephas maximus) in contrast to their use of mirror cues to discover hidden food |
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Journal Article |
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Year |
1989 |
Publication |
J. Comp. Psychol. |
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103 |
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122 |
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Equine Behaviour @ team @ |
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3026 |
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Author |
Izraely, H.; Choshniak, I.; Shkolnik, A.; Stevens, C.E.; Demment, M.W. |
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Title |
Factors determining the digestive efficiency of the domesticated donkey.(Equus Asinus Asinus ) |
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Journal Article |
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Year |
1989 |
Publication |
Q J Exp Physiol |
Abbreviated Journal |
Q J Exp Physiol |
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74 |
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1 |
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1-6 |
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Factors determining the digestive efficiency of donkeys were studied in animals fed either a low quality roughage (wheat straw: 77{middle dot}1% neutral detergent fibre, 2{middle dot}8% crude protein) or a high quality forage (alfalfa hay: 47{middle dot}5% neutral detergent fibre, 22{middle dot}7% crude protein). The neutral detergent fibre (NDF) intake when fed wheat straw was 1693 {+/-} 268 g animal-1 day-1, 10% higher than when fed alfalfa hay. Digestive coefficient of NDF and acid detergent fibre (ADF) when fed wheat straw amounted to 50{middle dot}9 {+/-} 4{middle dot}9 and 42{middle dot}0 {+/-} 4{middle dot}1% respectively. NDF and ADF apparent digestibilities and mean retention times (37{middle dot}7 {+/-} 1{middle dot}7 and 36{middle dot}4 {+/-} 3{middle dot}2 h respectively) were not significantly different (P [rang] 0{middle dot}05) between the two diets. The donkey appears to digest cell wall constituents as efficiently as the Bedouin goat when on low quality roughage, but less efficiently when fed alfalfa hay. Its energy digestibility is, however, as high as that reported for the Bedouin goat. The donkey's high energy digestibility is related to its capacity to digest soluble food components more efficiently than the ruminant. The mean retention time in the donkey is shorter than in the Bedouin goat and is consistent with its capacity to compensate for a lower quality diet by increasing its intake rate. Recycling of urea in donkeys maintained on wheat straw amounted to 75{middle dot}5 {+/-} 13{middle dot}0% of the entry rate. A decrease in the rate of renal urea filtration, coupled with an increase in the fraction reabsorbed, increased the retention of nitrogenous waste and permitted recycling of nitrogen into the gut. N1 - |
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Notes |
from Professor Hans Klingels Equine Reference List |
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yes |
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1216 |
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Author |
Hunter, L.; Houpt, K..A. |
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Title |
Bedding material preferences of ponies. |
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Journal Article |
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Year |
1989 |
Publication |
Journal of American Society of Animal Science |
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J Anim Sci |
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67 |
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8 |
Pages |
1986-1991 |
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The bedding preferences of ponies were determined using video recordings of nighttime (1900 to 0700) behavior of individually housed ponies. The ponies' behavior each minute was recorded to determine time budgets. In Exp. I, preference for bedding was determined using three mares, three stallions and two geldings given access to bedded and unbedded areas in a box stall. The ponies spent more time (66%) on the bedded area and were never observed lying on the unbedded areas. In Exp. II, three mares and six stallions were given access to a box stall, one side of which was bedded with wood shavings and the other with straw. Although some individual animals preferred one bedding over the other, neither form of bedding was preferred consistently. Time budgets in Exp. II were similar on both bedding materials. The ponies spent 12% of their nighttime lying, 2% walking, 35% eating and 50% standing inactively. Some ponies had a relatively strong preference for bedding, but the type of bedding preferred varied with the individual animal. Some individual ponies had no clear preference, but instead had a side or position preference |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1211 |
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Author |
Ginsberg, J.R., |
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Title |
The ecology of female behaviour and male mating success in the Grevy's zebra |
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1989 |
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Symposium of the Zoological Society of London |
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Symp zool Soc Lond |
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61 |
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89-110 |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1112 |
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Author |
Chandler M; Fritz AS; Hala S |
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Title |
Small scale deceit: deception marker of 2-, 3- and 4-year-olds' early theories of mind |
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1989 |
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Child Dev. |
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60 |
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1263 |
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Equine Behaviour @ team @ |
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2986 |
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