Linked Life Data

2753120

Source:http://linkedlifedata.com/resource/pubmed/id/2753120

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1989-9-7
pubmed:abstractText
Large numbers (10(4) to greater than 10(5)/ml) of Type I water-resistant Giardia lamblia cysts were produced in vitro under conditions that are characteristic of the human intestinal lumen. We define Type I cyst morphology as oval shaped, smooth, and refractile, with cyst wall, axostyle, and median body visible in relief by Normarski differential interference contrast optics. Human and porcine bile induced higher levels of encystation than bovine bile at the alkaline pH (7.8) which occurs in the human lower small intestine. High-pressure liquid chromatography analysis showed that the porcine bile had a preponderance of hyocholate, rather than cholate, while bovine bile had less chenodeoxycholate and more deoxycholate than human bile. Lactic acid, a major product of bacterial metabolism in the human colon, further stimulated encystation. Growth of the preencystation culture without bile also increased subsequent encystation. More than 90% of Type I cysts produced with porcine bile plus lactic acid were viable as indicated by the uptake and retention of fluorescein diacetate and exclusion of propidium iodide. Biological activity of in vitro-derived water-resistant cysts was demonstrated by the observation that 1 to 9.5% excysted in vitro. The percentage of excystation was greatly decreased following encystation at pH 7.0 or by omission of bile or lactic acid. This is the first quantitative in vitro demonstration of the complete life cycle of G. lamblia from humans.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0014-4894
pubmed:author
pubmed:issnType
Print
pubmed:volume
69
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
164-74
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Giardia lamblia: the roles of bile, lactic acid, and pH in the completion of the life cycle in vitro.
pubmed:affiliation
Department of Pathology, University of California, San Diego 92103.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.