The renal lesions of electrolyte imbalance. IV. The intranephronic calculosis of experimental magnesium depletion

A dietary depletion of magnesium in rats leads to the production in the thin limb of Henle's loop of the nephrons of spherical microliths composed of a matrix of PAS-positive substances and calcium phosphate (3). These microliths grow by accretion to form intranephronic calculi. The classical pathological syndrome of clinical nephrolithiasis is thus reproduced within the nephron; to wit, the origin of the calculus at a certain level, local traumatic damage at the site of its origin, passage with the fluid flow down the urinary passages, lodgment of the calculus at some restricting point, obstruction of fluid flow and the usual consequent localized intrarenal "hydronephrotic" alterations of regressive atrophic cellular dysplasias within the nephron. To the classical description of the two forms of urinary lithiases occurring in the bladder and in the renal pelvis must therefore be added a third form, intranephronic calculosis. From the first origin of a microlith to its ultimate form as a calculus its organized structure is characterized by its matrix (PAS-positive materials) in which the periodic precipitation of crystalline mineral (Ca(++), PO(3) (---)) occurs in a pattern simulating Liesegang rings.

Long-Period Seismic Waves from Nuclear Explosions in Various Environments

Large nuclear explosions in the solid earth, the hydrosphere, and the lower and upper atmosphere have generated seismic waves of periods greater than about 5 seconds which have been detected at great distances from the source.

THE LURE OF MEDICAL HISTORY: CLAUDE BERNARD

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THE LURE OF MEDICAL HISTORY: BOERHAAVE

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The Lure of Medical History: Paracelsus

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THE EFFECT OF VALENCY OF CATIONS AND ANIONS ON NEGATIVELY AND POSITIVELY CHARGED RED BLOOD CELLS

1. Under comparable conditions, valency effect may be demonstrated with a suspension of red blood cells and the cations and anions of salts. 2. The valency of the cation determines the degree of the effect on negatively charged cells, the valency of the anion, the effect on positively charged cells. 3. Anomalies in valency effects with different salts and red cell suspensions are in part due to variations in H ion concentration, depending on the degree of hydrolysis of the salt.

The Relation of Hodgkin's Disease to Lymphosarcoma and Endothelioma

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