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1

Studies on the oil-seawater emulsion structure basaed on light attenuation data. Part II.Determination of the oil drop mean size in the monodispersive approximation

100%
Ston M.
Oceanological Studies
|
1994
|
issue 66/7
89-94
EN
The method of employing the phenomenon of light attenuation by water-and-oil emulsions for assessment of the mean size of ilo drops is presented.
2
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NANC transmission in intestines and its pharmacological modulation

88%
Bauer V.
Acta Neurobiologiae Experimentalis
|
1993
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vol. 53
|
issue 1
65-77
EN
Non-adrenergic, non-cholinergic (NANC) nerve stimulation results in excitation (e.j.p., rebound depolarization, contractions) or inhibition (i.j.p., afterhyperpolarization, relaxations) of the gut. NANC neuronal mechanisms participate in the maintenance of the basal tone and spontaneous activity of the gut. There are however species differencies, i.e. both NANC excitation and inhibition are present in the guinea pig and only NANC inhibition in the rat intestine. Substance P-like neuropeptide/s are suggested to be mediators released from excitatory NANC and sensory nerves. The latter are activated by histamine and degenerated by capsaicin. There is evidence in favor of a nitric oxide-like substance rather than ATP, dopamin, GABA and neuropeptides (e.g. VIP, PHI/PHM) as the inhibitory NANC mediator in the gut. TTX, high Mg?+ -low Ca?+ media, 3,4-diaminopyridine, dipyridamol and adenosine deaminase modulate NANC excitation and inhibition. The NANC excitation is more sensitive than the NANC inhibition to the action of catecholamines, reserpine, 6-hydroxydopamine, chymotrypsin, , bacitracin, opioids, free oxygen species and low concentration of local anesthetics.
3
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Molecular biology of prions

75%
Weissmann C., Enari M., Klohn P.-C., Rossi D., Flechsig E.
Acta Neurobiologiae Experimentalis
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2002
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vol. 62
|
issue 3
153-166
EN
The ?protein only? hypothesis holds that the infectious agent causing transmissible spongiform encephalopathies is a conformational isomer of PrP, a host protein predominantly expressed in brain and is strongly supported by many lines of evidence. Prion diseases are so far unique among conformational diseases in that they are transmissible, not only experimentally but also by natural routes, mainly by ingestion. The pathway of prions to the brain has been elucidated in outline. A striking feature of prions is their extraordinary resistance to conventional sterilisation procedures, and their capacity to bind to surfaces of metal and plastic without losing infectivity. This property, first observed in a clinical setting, is now being investigated in experimental settings, both in animals and in cell culture.
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