1. Achilles tendons of foetal, newborn, adult and old rabbits were examined by electron microscopy after staining by conventional methods or with the periodate/silver/methenamine technique. 2. The mean diameter of collagen fibrils increased with age whereas silver/methenamine-positivity became less evident. 3. Biochemical analyses showed a great decrease of the concentration of glycoproteins an...

The administration of methenamine mandelate (Mandelamine) to pregnant women causes the levels of estriol in their urines to be unmeasurably low when acid hydrolysis is used. When enzyme hydrolysis replaces acid hydrolysis, normal estriol values are obtained. This result is attributed to the formaldehyde released by acid from hexamethylenetetramine, a constituent of the drug. The formaldehyde re...

Methenamine silver stain was used to compare the number of cysts of Pneumocystis carinii contained in lung concentrate smears of homogenized lung tissue with the number in impression smears. Results were also compared with histopathological examination of methenamine silver-stained paraffin-embedded sections. Of slides from 23 preparations, a greater number of cysts were contained in concentrat...

In this paper, we study the arithmetic partial differential equations x′p = ax n and x ′ p = a. We solve a conjecture of Haukkanen, Merikoski, and Tossavainen (HMT, in short) about the number of solutions (conjectured to be finite) of the equation x ′ p = ax n and improve a theorem of HMT about finding the solutions of the same equation. Furthermore, we also improve another theorem of HMT about...

Histopathological study showed pseudoepitheliomatous hyperplasia of the epidermis and there was a granulomatous inflammatory infiltrate in the dermis composed of histiocytes, eosinophils, and polymorphonuclear cells. Globular structures with a thick, pigmented wall were seen scattered between the inflammatory cells, some of them arranged in the form of a rosary. These structures stained with pe...