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Biomedical subjects

H Knothe

Publications and source records attributed to H Knothe.

At least 91 records · Page 5Linked to original sources
PubMed1979

[In vitro activity of cefaclor (author's transl)].

A comparative study was conducted on the in vitro activity of cefaclor and other oral cephalosporins against a large number of freshly isolated clinical strains of gram-negative and gram-positive bacteria. The activity of cefaclor against gram-positive pathogens is very similar to that of cephalexin. The action of cefaclor against Streptococcus pneumoniae is superior. Cefaclor is the most active antibiotic against strains of Haemophilus influenzae, and is also more active than cephalexin and cephradine against non-beta-lactamase producing strains of Escherichia coli, Klebsiella species and Proteus mirabilis.

Bacteria↗
PubMed1979

[Antibacterial activity of mezlocillin and azlocillin/A survey (author's transl)].

A review of the antibacterial activity of 6-[(R)-2-[3-methylsulfonyl-2-oxo-imidazolidine-carboxamido]-2-phenyl-acetamido]-penicillanic acid sodium salt (mezlocillin, Baypen) and 6-[(R)-2-(2-oxo-imidazolidine-1-carboxamido)-2-phenyl-acetamido]-penicillanic acid sodium salt (azlocillin, Securopen) is given on the basis of extensive in vitro studies. The action of each of the preparations is compared with that of important antibiotics of other substance classes from the group of penicillins and cephalosporins.

Azlocillin↗
PubMed1979

Microbiological activity of cefazedone as compared to cefazolin and cephalothin.

In a comparison of the antibacterial activity of (6R,7R)-7-(2-[3,5-dichloro-4-oxo-1(4H)-pyridyl]-acetamido)-3-([5-methyl-1,3,4-thiadiazol-2-yl)-thio]methyl)-8-oxo-5-thia-1-azabicyclo[4,2,0]oct-2-ene-2-carboxylic acid (cefazedone, Refosporen) as compared to other cephalosporins it can be seen that cefazedone possesses good activity against gram-positive bacteria; as regards activity against Enterobacteriaceae, in particular strains of E. coli, Klebsiella species and Proteus mirabilis, they fall within the spectrum of activity of the substance.

Bacteria↗
PubMed1978

[Treatment of chronic bronchitis with Supristol and a cotrimoxazole preparation--comparative bacteriological and clinical findings, results of a double-blind study (author's transl)].

In a randomized double-blind study on the treatment of chronic bronchitis, Supristol (co-trifamole) was compared with co-trimoxazole. 163 patients participated in the clinical trial that was performed at three different hospitals in accordance with a uniform trial plan. The microbiological investigations were done centrally at a hygiene institute for all three hospitals. The bacteriological results from the 61 patients whose antibiogram revealed sensitive pathogens before starting the therapy demonstrate the equal effectivenesss of the two preparations. With Supristol there was an elimination rate of 95.3%, and with co-trimoxazole of 93.2%. The clinical parameters do not show any difference in effectiveness either.

Bronchitis↗
PubMed1978

Assays of cephalosporin antibiotics administered prophylactically in open heart surgery. Determination of serum and tissue levels before, during and after cardiopulmonary bypass.

Twenty-eight patients who underwent open-heart surgery were divided into three groups, each of which received a different antibiotic from the cephalosporin series (cephalotin, cefazolin or cefamandole) in order to prevent infection. All antibiotics were given via intravenous infusion in a dosage of 2 g prior to surgery. To clarify the question of antibacterial activity under operative conditions with the cardiopulmonary bypass, the serum and tissue levels were determined before, during and after the surgical procedure. The effectiveness of the cephalosporins against bacteria most frequently encountered in open-heart surgery was demonstrated and substantiated by the serum and tissue concentrations. It became apparent that, in view of the favorable serum and tissue levels during and after the cardiopulmonary bypass, cefamandole should be considered the antibiotic of choice in preventing infections during open-heart surgery.

Adult↗
PubMed1978

[Concentration in bone and haematoma of the aminoglycoside antibiotic tobramycin (author's transl)].

Tobramycin concentrations were assayed in the rabbit in serum during surgery and in serum, haematoma and bone tissue of the condyle of the femur in the absence of surgery. After a single i. m. injection serum levels were found to be 30% higher initially than in humans, but then dropped at a faster rate to zero. The hardening haematoma appeared to slow penetration of the antibiotic. The concentration in bone tissue was dependent on vascular supply. Surgery did not show any influence on the level of the concentrations.

Animals↗
PubMed1978

[Stability of MIC values from tetracyclines in different media (author's transl)].

The influence of nutrient-broth (NB), Mueller-Hinton-broth (MHB), isotonic-sensitive-broth (ISB) and tryptone-soya-broth (TSB) with respect to the determination of MIC values of three tetracyclines is shown. A difference of degradation of tetracycline derivates in the four media was found. The degradation in NB after 18 h was negligible, but in MHB after 18 h all the three tetracyclines were inactivated up to 42%. The MIC levels of staphylococcus aureus strains in NB were about twofold lower than those in MHB and TSB. The MIC levels in ISB were even three- to fourfold higher than in NB. From these results sensitivity testing of tetracycline derivates should be carried out with NB.

Culture Media↗
PubMed1978

[Antibiotic concentrations of the gallbladder following cystic duct stenosis. Clinical studies and animal experiments].

Serum and bile kinetics are measured after experimental cystic duct ligation in 24 rabbits and after acute stone obstruction in 24 clinical cases. Tissue, bile, and serum levels are compared. The results clearly demonstrate that pharmacologic data alone do not give sufficient indications for antibiotic therapy in biliary tract infection. Expected pathologic bacteria and their actual resistance are considered to be of great importance in the indication of antibiotic therapy.

Ampicillin↗
PubMed1977

Medical implications of macrolide resistance and its relationship to the use of tylosin in animal feeds.

Staphylococcus aureus strains isolated from human patients were tested for susceptibility to erythromycin and certain related antibiotics by the disc method. The incidence of resistance to erythromycin has remained relatively constant at less thatn 20 percent. Only four percent of erythromycin-resistant human clinical isolates were cross-resistant to tylosin. Oral administration to humans of tylosin or erythromycin did not cause an imbalance in the gram-negative Enterobacteriaceae nor did it cause the selection of resistance factors. It is concluded that, from the human medical standpoint, the use of tylosin in animal feeds does not present any threat to human health.

Animal Feed↗
PubMed1977

A review of the medical considerations of the use of tylosin and other macrolide antibiotics as additives in animal feeds.

The use of antibiotics in animal feeds is reviewed with special reference to possible problems which might be encountered in human medicine. Emphasis is placed on the macrolide antibiotics, especially tylosin. Even though there can be cross-resistance between tylosin and erythromycin, the increasing use of tylosin in animal feeds has not caused an increase of resistance to erythromycin in human isolates of Staphylococcus aureus. There is no significant evidence that tylosin resistant staphylococci of animal origin have endangered human health. Tylosin is not effective against the gram-negative intestinal flora, which thus does not lead to selection of R-factors by conjugation. From the human medical stand point, there is no reason that precludes the use of tylosin as a fee additive in animal feeds.

Animal Feed↗
PubMed1977

R plasmids coding for gentamicin, tobramycin, and carbenicillin resistance in Serratia, Klebsiella and Escherichia coli strains from a single clinical source.

Serratia marcescens, Klebsiella sp. and Escherichia coli strains bearing transferable resistance to aminoglycoside antibiotics, namely, gentamicin, tobramycin, kanamycin, streptomycin, lividomycin, and carbenicillin, as well as to a series of more classical drugs, began to emerge in materials from the Frankfurt University Hospital. Plasmids from Serratia, Klebsiella, and E. coli exhibit a broad host range in that they are transferable to E. coli, Proteus mirabilis and Salmonella typhimurium receipients. They are not transferable to Pseudomonas aeruginosa, although in that species plasmids of gentamicin and tobramycin resistance, was well as of resistance to further drugs, were detected in that area as early as in 1973. High-level carbenicillinase has been identified in Serratia and Klebsiella plasmids associated with drug resistance to aminoglycoside antibiotics.

Anti-Bacterial Agents↗