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Author |
Rodier, F. |
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Title |
[Spectral properties of porcine plasminogen: study of the acidic transition (author's transl)] |
Type |
Journal Article |
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Year |
1976 |
Publication |
European journal of biochemistry / FEBS |
Abbreviated Journal |
Eur J Biochem |
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Volume |
63 |
Issue |
2 |
Pages |
553-562 |
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Keywords |
Animals; Binding Sites; Guanidines; Hydrogen-Ion Concentration; *Plasminogen; Protein Binding; Protein Conformation; Spectrometry, Fluorescence; Spectrophotometry; Spectrophotometry, Ultraviolet; Swine; Temperature |
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Abstract |
The acidic transition of porcine plasminogen, prepared by affinity chromatography, was studied by non-destructive methods. These methods are based on the analysis of the behaviour of the tryptophyls under various conditions. The perturbation of the absorption and emission spectra by pH or temperature and the dynamic quenching of the intrinsic fluorescence are used to obtain information on structural changes which affect the environment of these residues. It is shown that by decreasing pH the fluorescence emission spectra are shifted toward the long wavelengths, with a broadening of the fluorescence band. The same effect can be obtained at constant pH by heating the protein solution. In order to analyze these phenomena, it is assumed that the fluorescence intensities at 355 nm and 328 nm reflect the proportion of the tryptophans which are exposed to the solvent, and buried, respectively. The plot of the ratio of the fluorescence intensities at these wavelengths versus pH or temperature leads to a titration curve showing an unmasking of tryptophans. The proportion of exposed tryptophans is measured by the dynamic fluorescence quenching technique and the data analyzed according to Lehrer. The plot of the fraction of exposed tryptophyls versus pH also shows the unmasking of these chromophores. Thermal perturbation of a solution of plaminogen at neutral pH induces a difference absorption spectrum whose amplitudes at the maxima are proportional to the number of exposed aromatic residues. The comparison with a solution of fully denatured plasminogen in 6 M guanidium chloride, where all the tryptophyls are exposed, shows that the percentage of exposure is equal to 59%. This number is significantly higher than the percentage found by the fluorescence quenching technique (20%), indicating that some tryptophyls are located in crevices, exposed to the solvent but not to the iodide. At acidic pH the absorption difference spectra induced by thermal perturbation are not classical, since they show an inversion and a new band between 300 nm and 305 nm. This band is mentioned in the literature as a minor band of tryptophan which appears when this chromophore is located in an asymmetric environment. On plotting the maximum amplitude of these spectra obtained at acidic pH versus temperature, we obtain a curve indicating that two types of antagonistic interactions are involved in the perturbation of the chromophores spectra. The spectrophotometric titration of plasminogen gives classical absorption difference spectra. By plotting the maximum amplitude at 292 nm versus pH, we obtain a titration curve with an apparent pK of 2.9 units. This pK is acidic which respect to the pK value of a normal carboxyl. This low value can be due to a positively charged group in the neighbourhood of a carboxyl, which interacts with one or more chromophores. When the carboxyl becomes protonated, this positively charged group is free and available to perturb the environment of some chromophores... |
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French |
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Original Title |
Proprietes spectrales du plasminogene porcin. Etude de la transition acide |
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0014-2956 |
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PMID:4326 |
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Call Number |
Admin @ knut @ |
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22 |
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Author |
Brown, R.F.; Houpt, K.A.; Schryver, H.F. |
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Title |
Stimulation of food intake in horses by diazepam and promazine |
Type |
Journal Article |
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Year |
1976 |
Publication |
Pharmacology, biochemistry, and behavior |
Abbreviated Journal |
Pharmacol Biochem Behav |
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Volume |
5 |
Issue |
4 |
Pages |
495-497 |
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Keywords |
Age Factors; Animals; Diazepam/*pharmacology; Diet; Feeding Behavior/*drug effects; Female; Horses/*physiology; Male; Promazine/*pharmacology; Stimulation, Chemical |
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Abstract |
In two adult horses doses of 0.02-0.03 mg/kg diazepam, intravenously, increased 1 hr intake 54-75% above control levels. Intake was stimulated when the diet was a high grain, calorically dense one and also when the diet was a high fiber, calorically dilute one. Two young rapidly growing weanling horses showed an even more pronounced stimulation of intake. Following diazepam 1 hr intake was increased 105-240% above control lelvels. Promazine at a dose of 0.5 mg/kg also stimulated intake in adult horses, but not as markedly as did diazepam. A transquilizer and a neuroleptic appear to have a stimulatory eff upon short-term intake in horses. |
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0091-3057 |
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PMID:1005496 |
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Call Number |
refbase @ user @ |
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60 |
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Author |
Houpt, K.A. |
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Title |
Animal behavior as a subject for veterinary students |
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Journal Article |
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Year |
1976 |
Publication |
The Cornell veterinarian |
Abbreviated Journal |
Cornell Vet |
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Volume |
66 |
Issue |
1 |
Pages |
73-81 |
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Keywords |
Aggression; Animals; *Behavior, Animal; Cats; Chickens; Dogs; Education, Veterinary; Goats; Horses; Humans; Maternal Behavior; Mice; New York; Sexual Behavior, Animal; Sheep; Sleep; Social Behavior; Social Dominance; Swine |
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Knowledge of animal behavior is an important asset for the veterinarian; therefore a course in veterinary animal behavior is offered at the New York State College of Veterinary Medicine as an elective. The course emphasizes the behavior of those species of most interest to the practicing veterinarian: cats, dogs, horses, cows, pigs and sheep. Dominance heirarchies, animal communication, aggressive behavior, sexual behavior and maternal behavior are discussed. Play, learning, diurnal cycles of activity and sleep, and controls of ingestive behavior are also considered. Exotic and zoo animal behaviors are also presented by experts in these fields. The critical periods of canine development are related to the optimum management of puppies. The behavior of feral dogs and horses is described. The role of the veterinarian in preventing cruelty to animals and recognition of pain in animals is emphasized. Whenever possible behavior is observed in the laboratory or on film. |
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0010-8901 |
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Notes |
PMID:767053 |
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Call Number |
refbase @ user @ |
Serial |
61 |
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Author |
Kirkpatrick, J.F.; Vail, R.; Devous, S.; Schwend, S.; Baker, C.B.; Wiesner, L. |
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Title |
Diurnal variation of plasma testosterone in wild stallions |
Type |
Journal Article |
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Year |
1976 |
Publication |
Biology of reproduction |
Abbreviated Journal |
Biol Reprod |
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Volume |
15 |
Issue |
1 |
Pages |
98-101 |
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Keywords |
Animals; *Circadian Rhythm; Horses/*blood; Male; Montana; Sexual Behavior, Animal; Species Specificity; Testosterone/*blood |
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0006-3363 |
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Notes |
PMID:986195 |
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no |
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Call Number |
refbase @ user @ |
Serial |
149 |
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Author |
Zentall, S.S.; Zentall, T.R. |
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Title |
Activity and task performance of hyperactive children as a function of environmental stimulation |
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Journal Article |
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Year |
1976 |
Publication |
Journal of consulting and clinical psychology |
Abbreviated Journal |
J Consult Clin Psychol |
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Volume |
44 |
Issue |
5 |
Pages |
693-697 |
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Keywords |
Achievement; Acoustic Stimulation; *Arousal; Auditory Perception; Child; Humans; Hyperkinesis/*etiology; Photic Stimulation; Visual Perception |
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0022-006X |
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PMID:965541 |
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refbase @ user @ |
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272 |
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Author |
Eisenmann V, |
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Title |
Le protostylide: valeur systématique et signification phylétique chez les espèces actuelles et fossiles du genre Equus |
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Journal Article |
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Year |
1976 |
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Abbreviated Journal |
Z Säugetierk |
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41 |
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Pages |
349-365 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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Call Number |
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Serial |
1048 |
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Author |
Hagen H, |
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Title |
Verhalten beim Steppenzebra |
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Journal Article |
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Year |
1976 |
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Abbreviated Journal |
Die Welt der Tiere |
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170-172 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1157 |
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Author |
Janis C, |
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Title |
The evolutionary strategy of the Equidae and the origins of rumen and cecal digestion |
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Journal Article |
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1976 |
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Abbreviated Journal |
Evolution |
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30 |
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757-774 |
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from Professor Hans Klingels Equine Reference List |
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1217 |
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Author |
Jaworowska M, |
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Title |
Verhaltensbeobaachtungen an primitiven polnischen Pferden, die in einem polnischen Wald – Schutzgebiet – in Freiheit lebend – erhalten werden |
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Journal Article |
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Year |
1976 |
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Abbreviated Journal |
Säugetierk Mitt |
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24 |
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241-268 |
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from Professor Hans Klingels Equine Reference List |
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1220 |
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Author |
Keiper Rr, |
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Title |
Interactions between cattle egrets and feral ponies |
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Journal Article |
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Year |
1976 |
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Abbreviated Journal |
Proc Pennsyl Acad |
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Volume |
50 |
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Pages |
89-90 |
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from Professor Hans Klingels Equine Reference List |
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Call Number |
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1249 |
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