Importance of the viscous substance at the tip of the labellar taste hairs ofPhormia regina M. on the salt-sugar interaction

Summary The role of the mucopolysaccharide layer at the tip of labellar taste hairs ofPhormia regina M. on the inhibitory mechanism of sugar ont he stimulating effect of salt and vice versa has been investigated.This work is partly supported by a grant from the Consiglio Nazionale delle Ricerche (CNR), Roma, Italy.     

Influence of feeding conditions on wing,labellar and tarsal hair resistance inPhormia regina (Meig.)

Summary Feeding enhances resitance of wing, tarsal and labellar hairs ofPhormia regina Meig. The observed increase in resistance might be related to variations in the secretory function of the accessory cells at the hair sockets. The importance of this fact in feeding control is discussed.This work was partly supported by a grant from the Consiglio Nazionale delle Ricerche (CNR), Rome, Italy.     

Influence of the age of the mouse on the effectiveness of stimulation of its defenses by electromagnetic radiation]

Biological effects of microwaves on experimental trypanosomiase in the Mouse depends on the state of development of the animal. In fact such stimulation needs a mature immune system. Nevertheless, the increasing of the molecular immune response is only one of the aspects of protection mechanisms stimulated by such microwaves.     

Fine structure of the tip of chemosensitive hairs in two blow flies and the stable fly

Zusammenfassung Licht- und elektronenmikroskopische Studien der chemorezeptiven Spitze von Geschmackshaaren wurden bei den FliegenPhormia regina, Calliphora vicina undStomoxys calcitrans durchgeführt. Die Geschmackshaare dieser Fliegen ähneln sich strukturell bis auf einen ausgeprägten Öffnungs- und Schliessmechanismus, der für die Geschmackshaare vonStomoxys calcitrans lichtmikroskopisch nicht nachgewiesen werden konnte. Die Resultate werden hinsichtlich der Lokalisation der chemosensiblen Membran diskutiert.     

Influence of clonidine on experimental hypertension induced by cholinergic stimulation

Summary Hypertension may be induced by pharmacologic activation of central cholinergic receptors either indirectly, through the injection i.v. of physostigmine, or directly, through the injection i.v. of arecholine in anesthetized rats. Activation of peripheral preganglionic cholinergic receptors with dimethylphenylpiperazinium iodide (DMPP) also produced a hypertensive response. Pretreatment with various doses of clonidine caused inhibition of the pressor response to central cholinergic stimulation but was without effect on the response to ganglionic cholinergic stimulation.     

Influence of mono- and multivalent cations on the electrokinetic properties of normal human lymphoid and burkitt lymphoma cells.

Various mono- and multivalent cations, at constant ionic strength, affected the surface electrokinetic properties of normal human lymphoid and Burkitt lymphoma cells in a manner which reflected more the physicochemical properties and binding affinities of the cation than its valence. The effect was expressed in the changes of the magnitude of the net surface charge and in the shift of the isoelectric point of the surface. These changes were greater at the surface of Burkitt's lymphoma cells than at the surface of their normal cell-line counterparts.     

Influence of mono-and multivalent cations on the electrokinetic properties of normal human lymphoid and Burkitt lymphoma cells

Summary Various mono- and multivalent cations, at constant ionic strength, affected the surface electrokinetic properties of normal human lymphoid and Burkitt lymphoma cells in a manner which reflected more the physicochemical properties and binding affinities of the cation than its valence. The effect was expressed in the changes of the magnitude of the net surface charge and in the shift of the isoelectric point of the surface. These changes were greater atthe surface of Burkitt's lymphoma cells than at the surface of their normal cell-line counterparts.     

The action of substance P on mesencephalic reticular and substantia nigral neurones of the rat.

Extracellular recordings were made from neurones in the mesencephalic reticular formation and substantianigra of the rat which was anaesthetized with urethane 1.5-2 g/kg i.p. Out of 44 cells tested 42 were excited by Substance P applied iontophoretically and in some cases this excitation was rapid. Evidence is presented for Substance P as a putative excitatory transmitter onto reticular and nigral neurones possibly released from primary sensory afferents.     

Effect of alkali cations on the interaction between detergents and erythrocyte membranes

Resumen Los distintos cationes alcalinos monovalentes (145 mM) y divalentes (100 mM) modifican marcadamente el grado de hemólisis de eritrocitos humanos provocado por Triton X-100 y por desoxicolato de Na (DOC). La serie de actividad con cationes monovalentes en hemólisis por Triton es K>Rb=Cs>NaLi, y por DOC es Li>Rb=Cs>K>Na. Por el contrario, el grado de solubilización de membranas eritrocitarias producido por Triton o DOC es independiente de los distintos cationes alcalinos.     

Joseph H. M. Wedderburn and the structure theory of algebras

Archive for History of Exact Sciences -     

Influence of continuous and intermittent (R-wave triggered) electrical stimulation of the carotid sinus nerve on the static characteristic of the circulatory regulator

Zusammenfassung Bei narkotisierten Hunden wurde der Karotissinusnerv sowhl mit Dauerimpulsen als auch mit R-Zacken-gesteuerten Impulszügen elektrisch gereizt. Die Blutdruckcharakteristik zeigt, dass der Messbereich des Kreislaufreglers unter kontinuierlicher und ohne Reizung bei etwa gleichen Druckwerten liegt. Die Reizung mittels Impulszügen führt dagegen zu einer Verlagerung des Messbereiches zu niederen endosinualen Drücken.