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  • 1
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé L'activité myoélectrique gastro-intestinale après opération abdominale a été étudiée chez l'opossum en état de jeûne ou après un repas. Cinq types d'études fuent pratiquées: 5 minutes, 1 heure, 3 heures après une laparotomie, après entéro-entéroanastomose et gastrojéjunostomie. Des enregistrements électomyographiques au niveau de l'estomac,du duodénum, du jéjunum, de l'iléon et du sphincter d'Oddi furent pratiqués chez l'animal en dehors de toute anesthésie. L'aspect à l'état de jeûne après intervention abdominale fut étudié depuis la fin de l'intervention jusqu'au cinquième jour; il fut placé sous la dépendance du type et de la durée de l'acte chirurgical. Le type correspondant à l'ingestion d'aliments ne se manifesta pas lorsque les aliments furent instillés avant l'apparition du complexe migratoire myoélectrique. En revanche ce type fut observé après l'apparition du complexe migratoire myoélectrique dans tous les cas à l'exception de deux d'entre eux, un de ces deux cas se manifestant chez un animal qui présentait un abcès intra-abdominal.
    Abstract: Resumen El período de abstinencia de alimentación oral después de operaciones abdominales está sujeto a grandes varianciones, principalmente debido a la controversia sobre la duration del íleo postoperatorio. Los recientes desarrollos en electromiografía han hecho posible una evaluación más precisa de la motilidad del tracto gastrointestinal. Se ha descrito un patrón específico de actividad mioeléctrica recurrente en el tracto gastrointestinal del perro en ayuno, el cual ha sido denominado complejo mioeléctrico migratorio (CMM). Algunos estudios han informado el efecto de operaciones abdominales sobre el CMM; sin embargo, el patrón mioeléctrico del estómago, intestino delgado y esfínter de Oddi no ha sido estudiado en el período postoperatorio inmediato. El propósito de este estudio es el de evaluar el efecto de las operaciones abdominales sobre la actividad mioeléctrica gastrointestinal y del esfínter de Oddi en el organismo en estado de ayuno y alimentado. La actividad mioeléctrica gastrointestinal de la zarigüeya después de operaciones abdominales fué estudiada en el estado de ayuno y en el animal alimentado para determinar el momento de la aparición del CMM después de una operación abdominal; también se analizó el patrón mioeléctrico después de administrar alimentación, inmediatamente después de la aparición del CMM. Cinco procedimientos quirúrgicos diferentes fueron realizados: laparotomía de cinco minutos, de una hora y de tres horas con manipuleo intestinal, enteroenterostomía, y gastroyeyunostomía. Registres electromiográficos del estómago, duodeno, yeyuno, ileon y esfínter de Oddi fueron obtenidos en animales no anestesiados. Patrones normales de ayuno después de operaciones abdominales fueron observados desde el período inmediatamente posterior a la cirugía hasta el quinto día postoperatorio, con variación según el tipo de operación. El patrón de intestino alimentado no se presentó en los experimentos en los cuales se instiló alimento antes de la aparición del CMM. Se observó un patrón alimentado normal después de la aparición del CMM en todos menos en dos experimentos, uno de los cuales correspondió a un animal con un absceso intraabdominal.
    Notes: Abstract Gastrointestinal myoelectric activity of the opossum, both in fasting and fed states, was studied after abdominal operations. Five different procedures were performed: a 5-min, a 1-hour, and a 3-hour laparotomy with intestinal handling, enteroenterostomy, and gastrojejunostomy. Electromyographic recordings from the stomach, duodenum, jejunum, ileum, and sphincter of Oddi were obtained from unanesthetized animals. A normal fasting pattern after abdominal operations was observed from immediately after surgery to the fifth postoperative day and depended on the type and duration of the surgical procedure. A fed pattern did not occur in the experiments in which food was instilled before the appearance of the myoelectric migrating complex. A normal fed pattern was observed after the myoelectric migrating complex appearance in all but 2 experiments, one of which occurred in an animal with an intra-abdominal abscess.
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  • 2
    ISSN: 1433-0474
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 4 (1968), S. 109-110 
    ISSN: 1432-0428
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0428
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
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  • 5
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Summary Neural activity is viewed as a stochastic point process, in which information resides in the modulation of a background of spontaneous activity. Characteristic features of the spatial and temporal mapping of sensory signals are discussed. One of the puzzling aspects of neural functioning is the integrity of the signal in its passage toward higher brain centers, in view of the fundamentally noisy response of the individual neuron. It is shown, that a process, we call image stabilization, is a direct consequence of the particular mapping function exemplified by lateral inhibition and adaptation.
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 141 (1938), S. 551-552 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT has long been known that some substances, for example, indigo, yield variously coloured solutions in different solvents. Change of solvent may affect the intensity and position of absorption maxima in the ultra-violet as well as in the visible spectrum. The fact that this phenomenon has been ...
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 130 (1932), S. 700-701 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THAT there is a relationship between the adrenal cortex and the sex functions has long been inferred from clinical observations, although until recently there has been little direct experimental evidence to support this view. Corey and Britton1 found that precocious maturation of sex ...
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  • 8
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple technique has been developed to image intense pulsed proton beams with radiachromic film and to measure their spatial distribution. The optical density (OD) of 50 μm thick film, sufficient to stop 1.5 MeV protons, is measured to infer the incident beam fluence. The OD increases nearly linearly with fluence up to 0.25 cal/cm2. This film is used to measure the uniformity of large-area beams as well as the detector in a multiple-pinhole camera to determine the source uniformity and divergence of applied-magnetic field and pinched-beam ion diodes. © 1999 American Institute of Physics.
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  • 9
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Rutherford scattering of pulsed 1 MeV proton beams is developed as a time-resolved fluence diagnostic for proton transport experiments. The incident beam is scattered from a thin aluminum target and recorded with a silicon PIN detector. For a pinched-beam diode, fluences of protons transported in 1 Torr air are consistent with fluences determined with calorimeters, provided the proton energy is smaller than expected from the measured ion current and voltage. Beam bunching is observed as the flight path increases, consistent with reduced proton energy at the head of the beam.
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2182-2188 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Absolute calibration of an annihilation-radiation NaI coincidence detection system for short-lived ion-induced radioactivity is described. Calibration with a 22Na radioactive source is compared with an independent calibration using the 12C(p,γ)13N(β+) reaction with 1 MeV protons from a Van de Graaff accelerator. These calibrations are consistent, provided correction for summing of the 0.51 and 1.27 MeV gamma rays from the 22Na source in the NaI detectors is included. This summing correction depends on the total efficiency for detecting 1.27 MeV gamma rays and can alter the calibration by as much as a factor of 2, depending on the size and separation of the detectors. A procedure to determine this correction using 60Co and 22Na radioactive sources is described. These two calibrations give a thick-target yield for the 12C(p,γ)13N reaction at 1 MeV of (8.0±0.4)×10−10 reactions/proton. Intense pulsed proton fluences of 0.08 to 3.7 cal/cm2, determined by coincidence counting β+ annihilation radiation produced by the 12C(p,γ)13N(β+) reaction, are in agreement with ion-beam fluences measured independently with carbon calorimeters on the same carbon sample. © 1996 American Institute of Physics
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