title: X-ray micro analyses of cations (Na, K, Ca) and anions (S, P, Cl) in uterine secretions during blastocyst implantation in the rat.
abstract: The mass changes of sodium, potassium, and calcium ions in the rat uterine secretion at blastocyst delay, activation, and attachment have been estimated with X-ray microanalyses of samples of uterine secretions absorbed by small Sephadex beads. A quantification of the ions was attempted by using a standardized coat of gold on the beads as a reference element for normalization of the ion peaks and by fitting the normalized values into corresponding linear regression equations obtained from measurements of step-wise dilutions of a control rat serum. The concentrations of sodium observed at delay, activation, and attachment were 117, 201, and 203 mEq/l, respectively, and those of potassium were 6, 18, and 19 mEq/l, respectively. Calcium values were about 2 mEq/l and decreased at attachment. Among the anions, only the chloride concentration increased at activation and attachment.
mesh_terms: D000818:Animals; D000838:Anions / Q000378:metabolism*; D001755:Blastocyst / Q000502:physiology*; D002118:Calcium / Q000378:metabolism; D002412:Cations / Q000378:metabolism*; D002712:Chlorides / Q000378:metabolism; D010064:Embryo Implantation; D005122:Exudates and Transudates / Q000378:metabolism; D005260:Female; D010758:Phosphorus / Q000378:metabolism; D011188:Potassium / Q000378:metabolism; D011247:Pregnancy; D051381:Rats; D012964:Sodium / Q000378:metabolism; D013455:Sulfur / Q000378:metabolism; D014599:Uterus / Q000378:metabolism*
chemical_list: D000838:Anions; D002412:Cations; D002712:Chlorides; D010758:Phosphorus; D013455:Sulfur; D012964:Sodium; D011188:Potassium; D002118:Calcium