IN A SYMPOSIUM devoted to angiotensin, it is appropriate to consider briefly the juxtaglomerular apparatus. Angiotensin makes its appearance in the body as a direct result of the proteolytic action of renin, and there is considerable evidence to support the hypothesis that all the renin in a kidney comes from the juxtaalomerular apparatus. Before reviewing this evidence, the anatomy of the juxt...

this paper presents design and construction of an automatic moldboard profilograph by substituting an optical sensor and a control system together with its evaluation. the modified profilograph is an electro mechanical apparatus in which a micro switch and a dc motor was replaced with an optical sensor and a control system for revolution of a dc motor. thereby, the considered surface is measure...