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Electrophysiological properties of neurones contained in the locus coeruleus and mesencephalic nucleus of the trigeminal nerve in vitro (1982)

Henderson, G. ; Pepper, C. M. ; Shefner, S. A.

Springer

Experimental brain research 45 (1982), S. 29-37

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ISSN: 1432-1106

Keywords: Locus coeruleus ; Mesencephalic nucleus of the trigeminal nerve ; In vitro brain slice ; Electrophysiology ; Lucifer yellow

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Intracellular recordings were made from neurones contained in the locus coeruleus and mesencephalic nucleus of the trigeminal nerve (MNV), in tissue slices cut from guinea-pig pons and maintained in vitro. Locus coeruleus neurones were of -52.7 ± 2.7 mV resting membrane potential; had an input resistance of 58.0 ± 7.6 MΩ and a membrane time constant of 7.3 ± 1.0 ms. These neurones fired action potentials in response to depolarizing current pulses. Depolarizing synaptic potentials (DSPs) were recorded in locus coeruleus neurones in response to focal stimulation of the surface of the slice. MNV neurones were of-51.9 ± 3.6 mV resting membrane potential; had an input resistance of 15.0 ± 1.8 MΩ and a membrane time constant of 1.35 ± 0.16 ms. These neurones were also excitable but differed from locus coeruleus neurones in that they showed accommodation to depolarizing current pulses and time-dependent anomalous rectification with hyper-polarizing current pulses. In MNV neurones focal stimulation did not give rise to DSPs. Intracellular injection of Lucifer yellow revealed that the cell bodies of locus coeruleus neurones were small and multipolar whereas MNV neurones had larger, monopolar cell bodies.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00235760

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Crystallization behavior of poly(3,3-bisethoxymethyl oxetane) and poly(3,3-bisazidomethyl oxetane) (1985)

Hardenstine, K. E. ; Henderson, G. V. S. ; Sperling, L. H. ; [et al.]

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Physics Edition 23 (1985), S. 1597-1609

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ISSN: 0098-1273

Keywords: Physics ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Two crystal modifications have been found for poly(3,3-bisethoxymethyl oxetane) [poly- (BEMO)] by wide-angle x-ray powder diffraction and differential scanning calorimetry, while only one modification has been found for poly(3,3-bisazidomethyl oxetane) [poly(BAMO)]. Melting temperatures for the two polymers were nearly the same, varying from about 70 to about 90°C depending on the thermal treatment; higher crystallization temperatures resulted in higher melting temperatures. The equilibrium melting temperature T*m was found to be 125 and 128°C for poly(BEMO) and poly(BAMO), respectively, by using the Hoffman-Weeks extrapolation procedure. Measurement of the melting-point depression of Poly(BEMO) and poly(BAMO) in dibutyl phthalate yielded enthalpy of fusion values of 2.25 and 12.8 kcal/mol, respectively. The percent crystallinity for poly(BEMO) and poly(BAMO), respectively, was calculated to be 55-60 and 13-30% based on DSC and x-ray analysis.

Additional Material: 9 Ill.