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- Abrahamsson, Jonas, 1954, et al.
(författare)
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The crystal structure of O-ethyl-S-(11-carboxyundecyl)dithiocarbonate
- 1976
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Ingår i: Acta Crystallographica Section B: Structural Science. - 0108-7681. ; 32:10, s. 2745-2749
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Tidskriftsartikel (refereegranskat)abstract
- O-Ethyl S-(I l-carboxyundecyl)dithiocarbonate (CJ5H~8S203) is triclinic (pT) with a=7·534, b=4·797, c=25·304 A, 0:=90·83, jJ=90·72 and y=79·71°. The bond distances and angles agree very well with those reported earlier for the homologue with a shorter carbon chain (C5). The conformations are also very similar in the two compounds. The ethyl end of one molecule just reaches S(2) of a neighbouring one. This results in a packing with only small regions of lateral hydrocarbon chain packing. The chain arrangement cannot be described by any known subcell.
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| 3. |
- Alm, Bernt, 1951
(författare)
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Piperidine: effects on locomotor activity and brain monoamine turnover
- 1976
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Ingår i: Psychopharmacology (Berl). - 0033-3158. ; 50:3, s. 301-4
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Tidskriftsartikel (refereegranskat)abstract
- The effects of piperidine HCl (PHCl) on locomotor activity, flexor reflex activity and monoamine levels, turnover, and synthesis were studied. Results indicate a sedative action and an increased turnover of noradrenaline (NA), but no effects on 5-hydroxytryptamine (5-HT) or dopamine (DA). Data obtained from flexor reflex experiments suggest that this is not secondary to alpha-adrenergic receptor blockade. One explanation might be an increased impulse activity of NA neurons, but the exact mechanism remains to be elucidated.
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| 5. |
- Blix, Arnoldus S, et al.
(författare)
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Cardiac receptors in ducks--a link between vasoconstriction and bradycardia during diving.
- 1976
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Ingår i: Acta Physiologica Scandinavica. - : Wiley. - 0001-6772 .- 1365-201X. ; 97:1, s. 13-9
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Tidskriftsartikel (refereegranskat)abstract
- It has been demonstrated that cardiac receptors, most likely of the left ventricular type, are present also in the duck's heart. These receptors and their reflex responses (i.e. bradycardia and hypotension) could be blocked by intrapericardial administration of lidocaine. Initially, usch receptor blockade did not affect efferent vagal control of heart rate, as revealed by undiminished bradycardia in response to a standardized vagal stimulation. After cardiac receptor blockade, however, the duck's normal bradycardia response to head immersion was greatly reduced. The cardiovascular response to submersion was now instead characterized by a marked rise in arterial pressure, with superimposed bouts of intensified bradycardia and pressure reduction, evidently induced reflexly from the arterial baroreceptors. Meanwhile, the bradycardia response to standarized efferent vagal stimulation was still the same as before intrapericardial lidocaine injection. These results suggest that the marked rise in cardiac filling pressure following the intense shemo-receptor-induced constriction of both resistance and capacitance vessels, activates ventricular stretch receptors signalling in vagal afferents. Apparently, the activation of these receptors contributes crucially to the bradycardia and reduction of cardial output, which balance off the greatly increased peripheral resistance in the diving duck.
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| 9. |
- Dave, Göran, 1945, et al.
(författare)
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Metabolic and hematological effects of starvation in the european eel, Anguilla anguilla L.—III. Fatty acid composition
- 1976
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Ingår i: Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology. - 1096-4959 .- 1879-1107. ; 53:4, s. 509-515
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Tidskriftsartikel (refereegranskat)abstract
- 1.1. Fatty acid composition in liver and muscle was studied in the European eel (Anguilla anguilla L.) after 11, 47, 96 and 164 days of starvation during the winter season. 2.2. The changes in muscle were small compared with those in liver. 3.3. In both liver and muscle there was a marked decrease in 14:0.∗ 4.4. In the liver starvation caused a decrease in 16:1, 18:1, 20:1 and/or 18:3 and an increase in 20:4, 20:5, 22:4 and 22:5. 5.5. The observed changes are discussed in relation to differences in distributional pattern among the lipid classes, to α- and β-positional preferences and to environmental temperature.
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| 10. |
- Frisén, Lars, 1939, et al.
(författare)
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A simple relationship between the probability distribution of visual acuity and the density of retinal output channels.
- 1976
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Ingår i: Acta ophthalmologica. - 0001-639X. ; 54:4, s. 437-44
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Tidskriftsartikel (refereegranskat)abstract
- Throughout the retina, the parameters of the probability distribution of visual acuity for monochromatic interference fringes are closely proportional to the number of retinal ganglion cells per degree of visual angle. There are no simple relationships to receptor spatial frequencies. These findings suggest that neuro-retinal acuity is determined principally by the spatial frequency of neural output channels.
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