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Digitale Medien

Unidirectional habituation of vestibulo-ocular responses by repeated rotational or optokinetic stimulations in the cat (1981)

Clément, G. ; Courjon, J. H. ; Jeannerod, M. ; [weitere]

Springer

Experimental brain research 42 (1981), S. 34-42

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ISSN: 1432-1106

Schlagwort(e): Vestibulo-ocular reflex ; Optokinetic nystagmus ; Vestibular habituation ; Cat

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary 1.Unilateral habituation of the vestibuloocular reflex was produced in adult cats stimulated by repeated unidirectional velocity steps (vestibular training) or by a continuously moving visual surround (optokinetic training). — 2. Unidirectional vestibular training produced a strong asymmetry of vestibuloocular responses (VOR). Responses to velocity steps applied to the “trained” labyrinth were decreased both in gain and in time-constant. This effect generalized to responses to sinusoidal oscillations (0.03 Hz to 0.1 Hz), i.e. to a stimulus not used during training. — No spontaneous nystagmus was ever observed in spite of the dynamic VOR asymmetry. — 3. Unilateral vestibular habituation produced by vestibular training appeared to be a long-lasting phenomenon. It was still present 10 days after the end of training. — 4. Optokinetic responses were not affected by vestibular training. — 5. Unidirectional optokinetic training produced an increase in the slow phase velocity of optokinetic nystagmus (OKN) by about 25% in both directions. This effect did not persist for more than a few minutes. A marked spontaneous nystagmus was recorded in the dark after each session of optokinetic training, with a slow phase in the direction opposite to the previous OKN. — 6. VOR in response to velocity steps and to sinusoidal oscillations were decreased unilaterally after optokinetic training. This effect was of short duration, however, and disappeared within the interval between training sessions. This lack of retention contrasted with the prolonged effect of vestibular training.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00235726

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Digitale Medien

Chemistry of epoxide resins. XVIIFor Part XVI, see Reference 1.. Influence of structure and curing conditions on the density, degree of cure, and glass transition temperature during the curing of epoxide resinsPaper presented at the San Francisco National Meeting of the American Chemical Society, Division of Organic Coating and Plastics Chemistry, April 1968. (1969)

Fisch, W. ; Hofmann, W. ; Schmid, R.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 13 (1969), S. 295-308

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ISSN: 0021-8995

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: During an investigation of various epoxide resin systems, some cases were found in which the room temperature density decreased with increasing curing temperature and increasing degree of cure. In other systems the density was found to be independent of the curing temperature. In these cases it is possible by deliberately stopping the reaction to measure density values which also decrease as the curing progresses. This unexpected behavior can be explained in a purely physical manner from the pattern of the density changes during an entire curing cycle. The density decrease of the noncured mixture, which is due to the increased curing temperature, outweighs all contraction effects consisting of isothermal chemical and cooling shrinkage, whereby the latter is dependent to a great extent on the glass temperature. In those cases where the glass temperature exceeds the curing temperature, the chemical reactions come to a standstill, when the temperature difference reaches a certain value, i.e. it “freezes chemically”. By means of values that can be measured readily at low temperatures, it is possible to construct diagrams from which the variation of the density at higher temperatures of the curing cycle can be estimated.

Zusätzliches Material: 12 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/app.1969.070130203

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Darstellung und Kristalldaten von LiBa2EuO4 (1967)

Bärnighausen, H. ; Schmid, R. D.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 354 (1967), S. 27-29

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ISSN: 0044-2313

Schlagwort(e): Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Beschreibung / Inhaltsverzeichnis: The new quaternary compound LiBa2EuO4 may be prepared from stoichiometric amounts of LiEuO2 and BaO by heating at 700°C under an inert atmosphere. According to Debye-Scherrer photographs. LiBa2EuO4 and LiEu3O4 are isostructural (space group Pbnm). The orthorhombic unit cell with a = 11.883, b = 12.130 and c = 3.601 Å contains 4 formula units LiBa2EuO4 (calculated density 6.369 g/cm3).

Notizen: Die neue quaternäre Verbindung LiBa2EuO4 kann aus den stöchiometrisch erforderlichen Mengen LiEuO2 und BaO durch Erhitzen bei 700°C unter Schutzgas erhalten werden. Wie aus DEBYE-SCHERRER-Aufnahmen hervorgeht, ist LiBa2EuO4 mit LiEu3O4 isotyp (Raumgruppe Pbnm). Die rhombische Elementarzelle mit a = 11,883, b = 12,130 und c = 3,601 Å enthält 4 Formeleinheiten LiBa2EuO4 (berechnete Dichte 6,369 g/cm3).

Zusätzliches Material: 1 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/zaac.19673540107

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