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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 |
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JAMA : the Journal of the American Medical Association |
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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 @ |
Serial |
3757 |
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Author |
McCall, C.A. |
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Title |
The effect of body condition of horses on discrimination learning abilities |
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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 |
22 |
Issue |
3-4 |
Pages |
327-334 |
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Discriminative learning abilities were studied in 12 mature, malnourished horses. All horses initially received a condition score (CS) between 2 and 4 on a scale of 1 (poor) to 9 (extremely fat). Then horses were assigned to one of 3 treatments based on their eventual, rehabilitated CS during discrimination testing: thin, CS 1-3; moderate, CS 4-6; and fat, CS 7-9. The discrimination learning task was performed for 14 days with a maximum of 20 trials per day. Daily criterion was set at eight consecutively correct trails. Total trials to first criteria and total errors during testing were recorded. Analysis of variance showed that treatments did not differ (P>0.05) in total trials to first criterion, however horses on the fat treatment did have higher total error scores (P<0.05) than horses on the thin or moderate treatments. This difference was probably owing to lack of motivation in the fat treatment horses, rather than to true learning ability differences. The sex of the horse did not significantly affect either learning score. |
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Equine Behaviour @ team @ |
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3570 |
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Author |
Dewsbury, D.A. |
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Title |
Comparative Psychology, Ethology, and Animal Behavior |
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Journal Article |
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Year |
1989 |
Publication |
Annual Review of Psychology |
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40 |
Issue |
1 |
Pages |
581-602 |
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refbase @ user @ |
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3541 |
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Author |
Visalberghi E; Trinca L |
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Title |
Tool use in capuchin monkeys: distinguishing between performing and understanding |
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Year |
1989 |
Publication |
Primates |
Abbreviated Journal |
Primates |
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30 |
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511 |
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Keywords |
Tool use – Cebus apella – Mental representation |
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A horizontal plexiglas tube containing a food-reward was presented to four naive tufted capuchins and suitable sticks were provided to push the reward out. Three monkeys out of four spontaneously used the tools and showed very different styles of solving the task. In more complex conditions, in which the sticks needed to be combined or actively modified in order to become effective, the monkeys were always successful; however, their performance was loaded with errors which did not disappear throughout the trials. Evidence of a difference between success in solving the problem and its understanding was found. This suggests that although capuchins can discover new means through active experimentation, they do not mentally represent the characteristics necessary for a tool to be effective, nor do they modify the tool appropriately beforehand. At this level, a major difference with chimpanzees emerges. |
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Equine Behaviour @ team @ |
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3047 |
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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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Year |
1989 |
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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 |
Fragaszy, D.M.; Visalberghi E. |
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Social influences on the acquisition of tool-using behaviors in tufted capuchin monkeys (Cebus apella) |
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1989 |
Publication |
Journal of Comparative Psychology |
Abbreviated Journal |
J. Comp. Psychol. |
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103 |
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2 |
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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 |
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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Author |
Gallistel, C.R. |
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Title |
Animal Cognition: The Representation of Space, Time and Number |
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1989 |
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Annual Review of Psychology |
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40 |
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1 |
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155-189 |
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Equine Behaviour @ team @ |
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2972 |
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Author |
Walker, S. |
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An introduction to animal cognition : By . Hillsdale, New Jersey: Lawrence Erlbaum (1988). Pp. viii + 328. Price [pound sign]8.95 paperback |
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1989 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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37 |
Issue |
Part 3 |
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521-522 |
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Equine Behaviour @ team @ |
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2922 |
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