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Biomedical subjects

L H Muschel

Publications and source records attributed to L H Muschel.

26 records · Page 2Linked to original sources
PubMed1966

Effect of actinomycin D on immune antibody, normal antibody, and complement.

Muschel, Louis H. (University of Minnesota, Minneapolis), Jean L. Jackson, and Karen Schmoker. Effect of actinomycin D on immune antibody, normal antibody, and complement. J. Bacteriol. 91:270-272. 1966.-The effect of actinomycin D on the immune response, when the antibiotic was administered to rabbits simultaneously with antigen, and its effect on naturally occurring levels of antibody and complement were determined. Those amounts of the antibiotic that effected a significant suppression of the immune response against deliberately injected antigens did not cause a decline in levels of naturally occurring antibody. Complement titers were also refractory to the antibiotic.

Animals↗
PubMed1966

Reversal of the bactericidal reaction of serum by magnesium ion.

Muschel, Louis H. (University of Minnesota, Minneapolis), and Jean E. Jackson. Reversal of the bactericidal reaction of serum by magnesium ion. J. Bacteriol. 91:1399-1402. 1966.-Magnesium ion was found to reverse the bactericidal action of the antibody-complement system. Concentrations of 0.03 to 0.11 m MgSO(4) or MgCl(2) were effective, provided that the reaction of the antibody-complement system did not proceed longer than 50 min. Salts of other monovalent and divalent cations, the polyamine, spermine, and several anticomplementary substances were inactive in reversing the serum bactericidal reaction. Thus, the bactericidal reaction of serum may be bacteriostatic under certain conditions, and this finding is compatible with the persistence of infection in certain diseases despite high levels of antibody.

Amines↗
PubMed1966

Antileptospiral activity of serum. I. Normal and immune serum.

Johnson, Russell C. (University of Minnesota, Minneapolis), and Louis H. Muschel. Antileptospiral activity of serum. I. Normal and immune serum. J. Bacteriol. 91:1403-1409. 1966.-Normal serum was found to exert a leptospiricidal effect, mediated by the complement system, against the nonpathogenic leptospires. Although resistant to normal serum, the pathogenic serotypes were susceptible to antiserum plus complement. Several variables in these immune leptospiricidal reactions were investigated. A reaction period of 3 hr at 37 C between serum substances and 1-day-old cells provided a maximal leptospiricidal effect. The normal serum of the rabbit, guinea pig, bovine, and human were leptospiricidal against the nonpathogenic serotypes, and, in conjunction with rabbit antiserum, rabbit and bovine complement were leptospiricidal against the pathogenic serotypes. Studies with C(14)-labeled leptospires indicated that the immune leptospiricidal reaction was associated with a loss of permeability control. Thus, like the gram-negative bacteria, the treponemes, erythrocytes, and nucleated mammalian cells, the leptospires may be included as cell types susceptible to the antibody-complement system.

Animals↗
PubMed1966

Activity of mitomycin C, other antibiotics, and serum against lysogenic bacteria.

Muschel, Louis H. (University of Minnesota, Minneapolis), and Karen Schmoker. Activity of mitomycin C, other antibiotics, and serum against lysogenic bacteria. J. Bacteriol. 92:967-971. 1966.-Lysogenic bacteria were found to be more sensitive to the bactericidal action of mitomycin C or streptonigrin than the corresponding sensitive or indicator strains. This result may be attributed to the induction of phage production in lysogenic cells by these antibiotics. Lysogenic and sensitive bacteria were, however, equally sensitive to chloramphenicol, streptomycin, and polymyxin B. In contrast to their greater sensitivity to certain phage-inducing antibiotics, the lysogenic state resulted in greater resistance to the bactericidal reaction of serum mediated by the complement system. In general, therefore, the lysogenic state may result in either decreased or increased sensitivity to various antimicrobial agents.

Antibiotics, Antineoplastic↗