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Biomedical subjects

M Sandholm

Publications and source records attributed to M Sandholm.

At least 91 records · Page 5Linked to original sources
PubMed1978

IgA in blood and thoracic duct lymph: concentration and degree of polymerization.

Lymph fluid and serum samples from four mammalian species were studied forthe concentration and degree of polymerization of IgA. The results suggest that in the mouse, in the rat and in the dog circulating IgA represents only a small fraction of all IgA entering the blood stream from the lymph vessels. A majority of the input IgA of oligomeric type (13S, 11S and 9S) in these species is cleared rapidly. Monomeric IgA, and in the mouse and the dog the dimeric (9S) variety, dwell much longer in the blood; and because of this they form the majority of the circulating IgA. Blood concentration of IgA is high in man, a species whose blood seems to receive mostly monomeric IgA. It is much lower in the rat, mouse and dog, and in these species most of IgA entering the blood is probably oligomeric.

Animals↗
PubMed1978

Desorption assay: a functional in vitro test for measuring the adhesion of E. coli on the urinary tract epithelium.

A functional test was developed to measure different adhesive properties of various Escherichia coli strains on the urinary tract epithelium. The test is based on initial incubation of everted canine ureteral segments in 2-hr cultures of E. coli (adsorption period), followed by sequential elutions in phosphate buffered saline. The release of bacteria (desorption rate) was measured from each elution by quantitative bacteriology. The function of the desorption assay was tested by showing different adhesive properties of various strains of E. coli. The strains isolated from infected canine urinary tracts showed high adhesion capacities superior to other strains of E. coli from different animal and/or tissue origin. This indicates a selective tissue and animal trophism determined by the strength of mucosal attachment. The test is also a valuable tool for measuring adhesion inhibiting substances in urine. The bulk of the adhesion inhibiting effect was localized in the urine ultrafiltrate.

Adhesiveness↗
PubMed1977

Changes of lipoamide dehydrogenase and mitochondrial structure in selenium-deficient chicks.

A selenium deficiency in chicks produces degeneration and fibrosis of the pancreas. An investigation was undertaken to determine whether or not the activity of lipoic acid is impaired in the pancreas of selenium-deficient chicks. Enzymatic analyses of selenium-deficient chick tissues showed a reduction in lipoamide dehydrogenase both in pancreas and liver at a very early stage of growth. Using both direct measurements and sucrose-gradient cellular fractionation, it was found that the lipoamide dehydrogenase activity of the supernatant increased, and that of the mitochondria decreased in selenium-deficient as compared to normal chick livers. These results indicate an increased fragility of the mitochondrial membranes in selenium-deficient chicks.

Animals↗
PubMed1976

Coagulation of serum by glutaraldehyde.

A semiquantitative method for the determination of the gamma-globulin in human serum was developed based on the observation that dilute glutaraldehyde solutions at serum pH first attack the most basic serum proteins, leading to a polymer (clot) consisting mainly of gamma-globulins. The clotting ability of serum by glutaraldehyde thus caould be used as an indicator of the gamma-globulin concentration.

Aldehydes↗
PubMed1976

Determination of antitrypsin activity on agar plates: relationship between antitrypsin and biological value of soybean for trout.

A new method is described for determination of antitrypsin activity based on inhibition of trypsin solubilization of calcium caseinate in agar plates. The method was applied to analyze soybeans after graded heat treatments for their antitrypsin content. Biological determination of protein and energy values of the soybean samples showed direct correlation of these values with the destruction of antitrypsin as measured by the new method, using rainbow trout.

Animals↗
PubMed1975

Pathogenesis of canine pyometra.

Escherichia coli strains associated with pyometra in 85 of 100 bitches investigated had an affinity for urinary tract epithelium and smooth muscle as well as for progesterone-stimulated endometrium and myometrium. The adherence via K-antigen seemed to be important for colonization of the pathogen during development of pyometra. urinary tract infection was detected in 23 of 32 bitches from which urine specimens were obtained. In these bitches, a strain of E coli identical to the strain in the infected uterus was isolated. It was concluded that subclinical urinary tract infection is associated with pyometra and that the uterus will be infected at early metestrus, when receptors for E coli are developed in the endometrium and myometrium, thus enhancing the colonization of bacteria in the uterus.

Animals↗
PubMed1975

Myxovirus-like structures in the glomerular endothelial cell cytoplasm in canine nephritis.

Electron microscopic examinations revealed the presence of myxovirus-like tubular structures, 200A in diameter, in the endothelial cytoplasm of the glomeruli in four dogs with chronic interstitial nephritis and in one healthy control dog. The structures were found inside the endoplasmic reticulum and in some longitudinal sections, the tubuli seemed to have a helical or spiral substructure. The morphology and cellular localization of the structures resembled those seen in systemic lupus erythematosus in man, and in cultures of cells from tissue infected with canine distemper. Precipitating canine distemper virus antibodies were not in evidence in dogs in which such structures were demonstrable by electron microscopy while these antibodies were found in other dogs.

Animals↗