Biomedical subjects

H Gall

Publications and source records attributed to H Gall.

147 records · Page 9Linked to original sources

PubMedDate not supplied

[Circadian rhythm of plasm testosterone levels. II. Testosterone levels during the 1st and 2d half-day].

Testosterone in plasma is measured in 50 young males in the morning and in the evening by radioimmunoassay. Peaks are found in the morning. At 07,00 h and 10,00 h the values lie on a plateau: 91,77% at 07.00 h and 90,59% at 10.00 h. The difference is not significant. Significant differences however can be noted in comparison between values in the first and second half-day. The difference between the 07.00 h value and the 16.00 h value amounts to 17,08%; between the 07.00 h value and the 19.00 h value, to 22,6%.

Adolescent↗

PubMedDate not supplied

[Comparative hemodynamic evaluations of varicocele by bidirectional ultrasonic Doppler sonography and phlebography of the internal spermatic vein].

Clinical studies (degree of severity) and bidirectional ultrasonic Doppler sonography (Pressure-type, Shunt-type) of varicocele were compared with the phlebography of the internal spermatic vein (degree of spermatic incompetence, diameter of the int. spermatic v.). Doppler probe and phlebography are equivalent methods to demonstrate the venous reflux in palpable varicocele and for follow-up examination after sclerotherapy. The subclinical varicocele is discussed. The slight degree of spermatic incompetence (reflux by Valsalva's manoeuvre) is responsible for the small varicocele (grade I) and the Pressure-type. The severe degree of spermatic incompetence (spontaneous reflux) causes the Shunt-type and the large varicocele (grade III) as well as a dilatation of the internal spermatic vein.

Hemodynamics↗

PubMedDate not supplied

Biomechanical aspects of two different implant-prosthetic concepts for edentulous maxillae.

Two essentially different implant-prosthetic concepts are known for the treatment of edentulous maxillae. One concept propagates a "concentrated" arrangement of four to six implants in the premolar and anterior regions with a fixed cantilever superstructure. An alternative is a "spread-out" implant arrangement of six implants placed in the tuberosity, premolar, and anterior regions. The prosthetic rehabilitation consists of a fixed horseshoe-shaped bar and a removable prosthesis. A cantilever situation is avoided. The biomechanical aspects of these implant-prosthetic concepts were studied with clinical strain-gauge measurements and theoretical three-dimensional analysis using the finite element method. Results revealed that the distribution of bone stresses is more favorable with a spread-out implant arrangement than with a concentrated implant arrangement and cantilever restoration. The resistance to bending of a superstructure has an influence on bone stress concentration that should not be ignored. Stresses are controlled not only by the number or distribution of implants, but also by the material and design of the superstructure.

Biomechanical Phenomena↗