A redundant hydraulic function of root hairs in barley plants grown in hydroponics.

The root hair-less brb of Hordeum vulgare L. (bald root barley) mutant was used to assess the significance that root hairs have for the hydraulic properties of roots and response to a limited supply of mineral nutrients in plants grown on hydroponics. The barley brb mutant and its parent wild-type (H.

[Cancerous stricture of the urethra].

When certain strictures which have been treated for a long time start to bleed, the possibility of carcinoma should be considered. However, cancer may present in the form of more recent and deteriorating dysuria. The diagnosis is based on urethrography which shows a narrow and tortuous pass.

[Urethral stricture. A history. From antiquity to the 18th century].

Long undistinguished from the other causes of lower urinary tract obstruction, stenosis of the urethra was truly individualized only in the XVIIIth century. Throughout this long history, treatment opposed repeated dilatations, capable of maintaining an acceptable urethral caliber, and methods aimed at directly destroying the stenosis, thereby ensuring permanent recovery.