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Digitale Medien

Studies on the termination of sinus nerve afferents (1977)

Jordan, D. ; Spyer, K. M.

Springer

Pflügers Archiv 369 (1977), S. 65-73

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ISSN: 1432-2013

Schlagwort(e): Carotid sinus nerve ; Primary afferent fibres ; Nucleus of the tractus solitarius ; C-fibres ; Antidromic potentials

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary Compound action potentials evoked by electrical stimulation in the brainstem of anaesthetized, paralyzed cats and rabbits were recorded distally in the carotid sinus nerve. The latencies of the components of the responses were indicative of fibres with conduction velocities between 0.5 and 32 m/s. These include both myelinated and unmyelinated fibres. Using histological reconstructions of the ‘responsive sites’, the termination of the primary afferent fibres of the sinus nerve within the medulla was mapped. In both cat and rabbit these responsive sites were restricted to thedorsomedial medulla in the vicinity of the NTS 0–3 mm rostral to the obex. Although in the cat the fast conducting myelinated fibres (conduction velocities 〉12.5 m/s) were discretely localized to the ventrolateral area of the NTS, the slower conducting myelinated and unmyelinated fibres were found more diffusely, spreading into areas dorsal and medial to the NTS. In the rabbit the terminals of all types of fibre were mainly confined to the NTS although some C fibres appeared to be grouped in the juxta-alar region. Responses were never evoked from the medial reticular formation or nucleus ambiguus in either cats or rabbits. The organization of the sinus nerve input to the medulla is discussed in the light of these results.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00580812

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Digitale Medien

High speed molecular weight distribution (1975)

Dark, William A. ; Limpert, Robert J. ; Carter, Jordan D.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 15 (1975), S. 831-833

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Details

ISSN: 0032-3888

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: It is now possible to do molecular weight distribution of polymeric material almost as fast as you can put them in solution. μSYRAGEL® has opened a new era in the determination of molecular weight distribution of polymers. With operational efficiencies of 800 plates/min., one can obtain a molecular weight distribution in 15 mins. Combining three of the newest advances in liquid chromatography - solvent delivery, septumless injection, and μSYRAGEL - now makes it possible to use molecular weight distribution as a quality control tool in polymerization and fabrication. The reproducibility of the molecular weight distribution is now good enough that overlays can be done from the raw data. The chromatograms can be used right off the recorder. The reproducibility of the weight average and number average molecular weight is 2-3 percent.

Zusätzliches Material: 10 Ill.