Growth of Smectite from Leached Layer During Experimental Alteration of Albite

1994 ◽  
Vol 42 (1) ◽  
pp. 7-17 ◽  
Author(s):  
Motoharu Kawano
Keyword(s):  
Experimental Alteration

Experimental Alteration of the Peri-Renal Tissue of Protopterus

1956 ◽  
Vol s3-97 (40) ◽  
pp. 519-534
Author(s):  
D. E. MOORHOUSE
Keyword(s):  
Normal Animal ◽  
Renal Tissue ◽  
Pigment Cells ◽  
Round Cell ◽  
Phagocytic Cells ◽  
Active Secretion ◽  
Intense Staining ◽  
Induced Stress ◽  
Experimental Alteration ◽  
Histochemical Tests

The experiments were carried out on Protopterus aethiopicus in East Africa. They were: the injection of commercial adrenocorticotrophic hormone, hypophysectomy, administration of ACTH after hypophysectomy, artificially induced aestivation, and artificially induced ‘stress’. The two elements of the lipid tissue show differing reactions to the experiments carried out. The large lipid cells appear to be under direct pituitary control: active secretion follows ACTH administration, hypophysectomy leads to a blocking of secretion. After ‘stress’ and hypophysectomy the small lipid cells develop sudanophil inclusions which are positive to the histochemical tests for steroids. This does not occur after ACTH administration. The phagocytes of the endothelial system take part in the transfer of material within the peri-renal tissue; this is shown by their cytology after ACTH administration and ‘stress’. Evidence from these experiments indicates that the round pigment cells characteristic of the normal animal are syncytial structures formed by the fusion of phagocytic cells containing pigment and remains of large lipid cells. The steroid tissue shows little change in these experiments other than a decrease in the amount of steroid material after ACTH, and a more intense staining of the mitochondria after hypophysectomy. The number of eosinophil leucocytes increases as the result of ACTH administration. The round cell nodules showed no detectable changes in these experiments.

scholarly journals EXPERIMENTAL ALTERATION OF BRAIN BULK

1919 ◽  
Vol 48 (4) ◽  
pp. 531-558 ◽  
Author(s):  
Lewis H. Weed ◽  
Paul S. McKibben
Keyword(s):  
Experimental Alteration

scholarly journals Gap junction structures after experimental alteration of junctional channel conductance.

1985 ◽  
Vol 101 (5) ◽  
pp. 1741-1748 ◽  
Author(s):  
T M Miller ◽  
D A Goodenough
Keyword(s):  
Gap Junctions ◽  
Gap Junction ◽  
Electron Micrographs ◽  
Time Course ◽  
Structural Changes ◽  
Lucifer Yellow ◽  
Freeze Fracture ◽  
Channel Conductance ◽  
Experimental Alteration ◽  
Quick Freezing

Gap junctions are known to present a variety of different morphologies in electron micrographs and x-ray diffraction patterns. This variation in structure is not only seen between gap junctions in different tissues and organisms, but also within a given tissue. In an attempt to understand the physiological meaning of some aspects of this variability, gap junction structure was studied following experimental manipulation of junctional channel conductance. Both physiological and morphological experiments were performed on gap junctions joining stage 20-23 chick embryo lens epithelial cells. Channel conductance was experimentally altered by using five different experimental manipulations, and assayed for conductance changes by observing the intercellular diffusion of Lucifer Yellow CH. All structural measurements were made on electron micrographs of freeze-fracture replicas after quick-freezing of specimens from the living state; for comparison, aldehyde-fixed specimens were measured as well. Analysis of the data generated as a result of this study revealed no common statistically significant changes in the intrajunctional packing of connexons in the membrane plane as a result of experimental alteration of junctional channel conductance, although some of the experimental manipulations used to alter junctional conductance did produce significant structural changes. Aldehyde fixation caused a dramatic condensation of connexon packing, a result not observed with any of the five experimental uncoupling conditions over the 40-min time course of the experiments.

Experimental alteration of tryptophan metabolism by methionine: Neuropharmacologic implications

1969 ◽  
Vol 8 (6) ◽  
pp. 615-626 ◽  
Author(s):  
H. Sprince ◽  
C.M. Parker ◽  
Jameson Dorothy ◽  
J.A. Josephs
Keyword(s):  
Tryptophan Metabolism ◽  
Experimental Alteration
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