Linked Life Data

1593531

Source:http://linkedlifedata.com/resource/pubmed/id/1593531

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1992-7-2
pubmed:abstractText
Demembranated spermatozoa from the rete testis developed vigorous flagellation when reactivated with ATP, but showed no forward progression such as that seen in samples from the cauda epididymidis. The proportion of spermatozoa that were reactivated was smaller for samples from the rete testis than from the cauda epididymidis. Studies in vitro of undiluted micropuncture samples from the epididymis indicated that the activity of spermatozoa is suppressed as they develop the capacity for motility. However, as spermatozoa spontaneously became activated during the collection or subsequent incubation of undiluted samples, it was concluded that the suppressive action is labile. The activity of spermatozoa in vitro was examined in diluted samples from the cauda epididymidis. A concentration of 2.5 mmol extracellular calcium/l was better than lower concentrations. Diluents at pH 5.5 completely inhibited sperm motility when they contained 20 mmol lactate/l (but not glutamate) and the effect was reversed by readjusting the diluent to pH 7.4. However, lactate was not considered to suppress sperm motility in situ, as the plasma from the cauda epididymidis contained only 2.7 +/- 0.5 mmol lactate/l. There was no effect of sodium concentration (1 and 115 mmol/l), pH (5.5 and 7.4) or amiloride (0 and 1 mmol/l) on sperm motility, indicating that motility is not dependent on the concentration of sodium above 1 mmol/l or on a sodium-proton exchange system. The relative viscosity of plasma from the cauda epididymidis did not affect the motility of spermatozoa.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0022-4251
pubmed:author
pubmed:issnType
Print
pubmed:volume
94
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
295-303
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Maturation and regulation of the motility of spermatozoa in the epididymis of the tammar wallaby (Macropus eugenii).
pubmed:affiliation
Department of Biological Sciences, University of Newcastle, NSW, Australia.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't