To determine the basis for the decline in testosterone production by the aged testis,
intratesticular unconjugated steroids, including testosterone, pregnenolone (3β-hydroxy-5 …

Measurements of testosterone concentrations in peripheral and spermatic venous blood
have yielded conflicting results concerning testosterone production in elderly men. To further …

As an extension of our studies on the influence of age on testicular function and with the aim
of detecting whether the decline in testosterone production by aged testes is accompanied …

Publisher Summary This chapter discusses gonadotropins and plasma testosterone in
senescence. An investigation described in the chapter showed that the testis was capable of …

Testosterone and the testosterone precursors pregnenolone, progesterone, 17α-
hydroxyprogesterone, 17α-hydroxypregnenolone, androstenedione, androstenediol and …

In the testicular metabolism of steroids, two areas have recently received great attention.
One involves studies on the possible role of steroid sulphates in the biosynthesis of …

Abstract Plasma cortisol, 17-hydroxyprogesterone (17-OH-P), testosterone (T), 5α-
dihydrotestosterone (DHT, estrone (E 1) and estradiol (E 2), were measured in 94 normal …

Abstract Androstenedione (Δ), Testosterone (T) and Dihydrotestosterone (DHT) have been
measured by radioimmunoassay in spermatic venous plasma from 38 men aged from 17 to …

Androgen biosynthesis in the male gonads may be analysed in some detail by means of in
vitro incubation of minor testicular biopsy specimens with various radiolabelled steroid …

The concentrations of testosterone, four of its precursors (pregnenolone, progesterone, 17±-
hydroxyprogesterone, and androstenedione), and three of its metabolites …