A preliminary study on the rheological properties of human ejaculate and changes during liquefaction / 亚洲男科学杂志(英文版)
Asian Journal of Andrology
;
(6): 299-304, 2004.
Article
in English
| WPRIM
| ID: wpr-270891
ABSTRACT
<p><b>AIM</b>To study the changes in rheological properties, namely the parameters of the hysteresis loops and yield stress versus time for human semen after ejaculation.</p><p><b>METHODS</b>Ejaculates were obtained from volunteers and immediately put into the test cup of a Brookfield Programmable DV-11 Rheometer, by which the hysteresis loops and yield stress were determined.</p><p><b>RESULTS</b>(1) Yield stress values dropped down from more than 3000 mPa to 60 mPa in about 5 minutes after ejaculation; (2) The shape of the hysteresis loops of shear stress versus shear rate was changed from the counter-clockwise direction, that enclosed a large area, into the clockwise direction, that enclosed a very small area.</p><p><b>CONCLUSION</b>Human ejaculate originally possesses semi-solid or visco-elastic body behavior and in 5 minutes after liquefaction, it becomes a thixotropic fluid or shearing thinning fluid with very low viscosity.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Physiology
/
Rheology
/
Semen
/
Sperm Motility
/
Stress, Mechanical
/
Viscosity
/
In Vitro Techniques
/
Linear Models
/
Elasticity
Limits:
Adult
/
Humans
/
Male
Language:
English
Journal:
Asian Journal of Andrology
Year:
2004
Type:
Article
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