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Puslapis 1 nuo 19 rezultatus
Potassium exchange between bathing solution and midgut of Hyalophora cecropia and time delay for potassium flux through the midgut.
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Exchange between potassium of the isolated midgut of the American silkworm Hyalophora cecropia and the bathing solutions has been determined by different authors, but with contradictory results. Therefore the experiments were repeated with another technique and the exchange determined for varying
Refinements in the short-circuit technique and its application to active potassium transport across the cecropia midgut.
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1. The conventional, two-electrode method for measuring potential difference across an epithelium is subject to error due to potential gradients caused by current flow in the bathing medium. Mathematical analysis shows that the error in measuring short-circuit current is proportional to the
Influx theory and size of potassium and rubidium pools in the midgut of Hyalophora cecropia.
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1. The midgut contains a 'pool' which must mix with tracer added to the blood-side, before the transported potassium reaches a steady specific activity. The size and mixing time of the pool can be deduced from the time-course of rate of appearance of tracer on the lumen-side, the tracer influx. The
Active transport of potassium by the Cecropia midgut; tracer kinetic theory and transport pool size.
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1. Tracer influx kinetics have been analysed theoretically to determine the size of the transport pool with no assumptions regarding the transport pathway. 2. For a calculation of the size of the transport pool to be made, the following six conditions are required by the theory: tracer steady state
Potassium and uric acid content in tissues of the silkmoth Hyalophora cecropia.
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Active transport of potassium by the cecropia midgut. VI. Microelectrode potential profile.
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ACTIVE TRANSPORT BY THE CECROPIA MIDGUT. I. INHIBITORS, STIMULANTS, AND POTASSIUM-TRANSPORT.
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Development and active potassium transport in the isolated midgut of Hyalophora cecropia.
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Active transport by the cecropia midgut. IV. Specificity of the transport mechanism for potassium.
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Active transport of potassium and oxygen consumption in the isolated midgut of Hyalophora cecropia.
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SODIUM-INDEPENDENT ACTIVE TRANSPORT OF POTASSIUM IN THE ISOLATED MIDGUT OF THE CECROPIA SILKWORM.
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Active transport by the cecropia midgut. V. Loss of potassium transport during larval-pupal transformation.
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An anion-stimulated adenosine triphosphatase from potassium-transporting midgut of the larva of Hyalophora cecropia.
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[Diuretic effect of Cecropia obtusifolia (Moraceae) on albino rats].
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The possible diuretic effect of the leaf extract of Cecropia obtusifolia, Bertol; used in Costa Rican traditional medicine, was tested on five Sprague Dawley rats in individual metabolic cages. During the control week, distilled water was administered with an intragastric cannula. During the
Active transport of calcium across the isolated midgut of Hyalophora cecropia.
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1. The net flux of 45Ca from lumen to blood side across the isolated and short-circuited Cecropia midgut was 1-9 +/- 0-2 muequiv. cm-2h-1 in 8 mM Ca and the flux ratio was as high as 56 to 1. 2. The calcium influx was depressed by anoxia; 73% after 30 min. 3. The kinetics of Ca transport were
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