Linked Life Data

11888221

Source:http://linkedlifedata.com/resource/pubmed/id/11888221

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2002-3-12
pubmed:abstractText
The objective of this study was to optimize interrupted slow-freezing protocols for African catfish semen. Semen diluted with methanol and extender was frozen in 1-ml vials in a programmable freezer. The temperatures of the freezer (T(chamber)) and of the semen (T(semen)) were measured simultaneously. We first tested two-step freezing protocols with different cooling rates (-2, -5, and -10 degrees C/min) and different temperatures at plunging into liquid N2. The difference between T(semen) and T(chamber) increased with faster cooling rates. In all programs, survival of spermatozoa, expressed as hatching rates, increased from near zero when T(semen) at plunging was higher than -30 degrees C to values equal to those of control when T(semen) at plunging was equal to or lower than -38 degrees C. The inclusion of an isothermal holding period before plunging into liquid N2 (three-step freezing protocols) resulted in an equilibration between T(semen) and T(chamber) and improved semen survival. Semen could be plunged at temperatures as high as -36 degrees C when cooled at -5 or -10 degrees C/min, without compromising postthaw semen survival. Cooling at -2 degrees C/min in combination with a 5-min holding period reduced postthaw survival. We conclude that with slow cooling rates of -2 to -5 degrees C/min, hatching rates can be maximized by plunging as soon as T(semen) reaches -38 degrees C. The isothermal holding period is beneficial when faster rates are used. A simple and efficient protocol for freezing African catfish semen can be obtained by cooling at a rate of -5 to -10 degrees C/min combined with a 5-min holding period in the freezer, at -40 degrees C.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0011-2240
pubmed:author
pubmed:issnType
Print
pubmed:volume
43
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
276-87
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Influence of cooling rates and plunging temperatures in an interrupted slow-freezing procedure for semen of the African catfish, Clarias gariepinus.
pubmed:affiliation
Fish Culture and Fisheries Group, Wageningen, 6700 AH, The Netherlands
pubmed:publicationType
Journal Article, Comparative Study, In Vitro, Research Support, Non-U.S. Gov't