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Biomedical subjects

H Günther

Publications and source records attributed to H Günther.

At least 109 records · Page 6Linked to original sources
PubMed1977

Synthesis of stereospecifically deuterated phenylalamines and determination of their configuration.

1. Starting from trans-cinnamic acid a chiral (-)3-phenyl-[2,3-2H]propionic acid has been synthesized using Clostridium kiuyveri cells as catalyst. 2. The chiral dideuterated acid has been converted by chemical methods to a mixture of (2R) and (2S)-phenyl[2,3-2H]-alanine. 3. By means of 1H nuclear magnetic resonance spectroscopy and the action of D and L-amino acid oxidase the configuration of the phenylalamine has been shown to be (2R, 3S) and (2S, 3S), respectively. The labelled phenylalanine is thus sterically and isotopically homogenous at position 3 but heterogenous at position 2.

Amino Acid Oxidoreductases↗
PubMed1977

[Contribution to the experimental hemophilus infection (Haemophilus parahaemolyticus, Haemophilus parasuis) in SPF piglets. 2. Comparative pathology and histology].

The pathologico-anatomic and even more the histological pattern of experimental Haemophilus parahaemolyticus pleuropneumonia in specific-pathogen-free piglets was found to be characteristic in the peracute, acute, and subacute-chronic stages of the disease. It is an infection which can be morphologically differentiated from other forms of pneumonia in swine primarily by three factors, localisation of the changes, inflammation, and a typical cell response. Changes following experimental Haemophilus parasuis infection were found to occur irregularly on serous skins and, in continuation, in the lung and joints. These were not characteristic and failed to exhibit morphological peculiarities.

Acute Disease↗
PubMed1977

[Contribution to the experimental haemophilus infection (haemophilus parahemolyticus, haemophilus parasuis) in specific pathogen-free piglets. 1. microbiology, experimental arrangement, results].

Experimental infections were applied to specific pathogen free (SPF) piglets and store pigs, using five haemophilus (H.) parahaemolyticus and two H.-parasuis strains. Different germs counts and modes of application were chosen for each of the animals involved (intratracheal, intranasal, and subcutaneous routes). Clinical and pathologico-anatomic changes typical of haemorrhagic-necrotising pleuropneumonia were obtained from all germ counts and methods of application. Only one of the test animals could be successfully infected to exhibit manifestations of pneumonia or serositis when H. parasuis was used. The high pathogenicity of H. parahaemolyticus, as recorded from the above experiments, was in agreement with the growing incidence of that haemophilosis recordable for some time from pig stock.

Animals↗
PubMed1977

[Intestinal absorption of colostrum components--a review].

Reference is made to the importance of maternal antibody to immunological protection of the newborn. For the majority of newborn domestic animals evidence has been produced to the effect that the intestine can absorb intact antibody from foremilk. Discussed in this context are the time limitation of that capability and its possible causes, such as enzymatic degradation of immunoglobulins in the intestinal lumen or epithelial cells, disappearance of the capability of epithelial cells for intracellular intake of macromolecules or for transport of incorporated molecules into the circulation, and the replacement of epithelium by non-absorptive border cells. Possibilities to control antibody absorption are suggested.

Animals↗
PubMed1977

[Studies on Salmonellosis in the calf. 5. Clinical testing of Smd-Salmonella-dublin vaccine for oral administration].

The oral vaccine, prepared on the basis of streptomycindependent mutants for administration to control S.-dublin infection, was clinically tested on 2,210 calves of 22 herds. The experimentally obtained findings regarding good tolerance and sufficient effectiveness of oral live vaccines were thus confirmed under field conditions. Good effectiveness of the oral vaccine was reflected in the recorded decline of clinical salmonellosis cases and of calf losses due to salmonellosis, and it was established also by bacteriological identification of S. dublin in faecal samples, histological sections, and material obtained from emergency slaughter carcasses. A comparison between this oral vaccine and "Mellavax" an imported vaccine for subcutaneous adminstration with good effectiveness, revealed superiority of the oral vaccine by almost all criteria of action. Particular importance was attributed to the significant reduction of the number of Salmonella-excreting animals (faeces) following oral immunisation. The oral vaccine against Dublin salmonellosis of calf was disembargoed for production in 1975 under the name of "Salmonella-dublin Live Vaccine Dessau".

Administration, Oral↗
PubMed1977

[Bordetella-bronchiseptica pneumonia in the swine].

Bordetella have been frequently detectable from lesioned lung material of swine as well as from the upper respiratory tracts of clinically intact animals. Pneumonia, different in extent, was produced in primarily specific pathogen free pigs by intratracheal and intranasal application of eight Bordetella isolates. Moderate to medium manifestations of focal pneumonia with scattered speckles developed, with severity depending on dosage and mode of infection. Histologically, they were characterised by vascular lesions and fibroblastic proliferation. This type of pneumonia thus was differentiated by the above characteristics from pneumonia caused by heamophils and Pasteurellae. Under conditions of natural exposure, Bordetella pneumonia can be expected to develop primarily due to defective host-patasite relationship. Bordetellae, in this context, are considered only conditionally pathogenic. Bordetellal infection will have to be taken into consideration in differential diagnosis whenever checks are made on pigs in industrialised units.

Animals↗
PubMed1976

[Premature rupture of fetal membranes and premature labor].

The portion of early rupture of the membranes among 521 premature births from 1962 to 1971 was 43.4%. The statistically sure effects of the early rupture of the fetal membranes to some irregularities in pregnancy and delivery on 214 premature births are reported, compared with 202 premature births without early rupture of the membranes. Twins are not considered. The therapeutic management of that time in the hospital consisted of staying in bed without tokolytics or antibiotics. After premature rupture of fetal membranes occured very often: irregular obstetrical presentation, hemorrhage and fever during labour, cesarean section and forceps delivery; the perinatal morbidity was increased. From that aspects for prophylaxis and therapy were deduced.

Amniocentesis↗
PubMed1976

[Second-look curettages in irradiated corpus-carcinoma].

Second-look-curettages at the end of combined radiation therapy of 44 cancers of the endometrium are reported. Eight rests of cancers and 11 atypical tissue formations have been found. In 19 patients symptomless pyometra could be revealed. Observations of progress between 1966 and 1975 showed no relationship with the results of the second-look-curettages. The purpose of second-look-curettages is discussed.

Adult↗
PubMed1975

[On the specifity and stereospecificity of the conversion of different 2,3-unsaturated acids by Clostridium kluyveri (author's transl)].

Further 2,3-unsaturated acids are revealed which can be reduced by Clostridium kluyveri with crotonate or butyrate as hydrogen donors. Unsaturated and saturated 3-halogenated acids are transformed into the saturated halogen-free acids. The following reaction sequence is proposed: a) hydrogenation, b) elumination of HX and c) again hydrogenation. Tiglinate ((E)-2-methyl-2-butenoate) and (E)-2-methyl-2-pentenoate are stereospecifically reduced to the (S)-2-methyl substituted acids. C. kluyveri contains endogenous material; in the presence of hydrogen acceptors such as 2,3-unsaturated acids this is degraded to acetate, and the reducing equivalents liberated hydrogenate the unsaturated acid. In a transient phase the hydration products of the unsaturated acids are present in the non-activated form in appreciable amounts. Tiglinate as well as crotonate is partially converted to ethyl methyl ketone and aceton and/or propanol, respectively.

Butyrates↗
PubMed1975

[The occurrence of a reductase of delta2-carboxylic acids in Clostridium kluyveri with a stereospecificity different from that of butyryl-CoA dehydrogenase (author's transl)].

A Clostridia strain (R-strain) which hydrogenates tiglinate (1b) and alpha-methylcinnamate (1c) in the presence of hydrogenase gas in 2H2O to (2R, 3S)2-methyl-[2,3-2H]butyrate (5b, H = 2H) and (alphaR, betaR)alpha-methyl[alpha,beta-2H]dihydrocinnamate (5c, H = 2H), respectively, was isolated. The configuration at C-3 was determined by 1H-NMR spectroscopy in the presence of Eu(fod)3. The stereochemistry of this hydrogenation is the mirror image of that which has been determined with intact cells of another strain of Clostridium kluyveri (S-strain). In the presence of hydrogen gas, the R-strain hydrogenates crotonate in 2H2O to butyrate with the following deuterium distribution: C-2, 1.85; C-3, 1.35; and C-4, 0.63 deuterium atoms. Crotonate seems to be the substrate of two reductases with sterically different actions. Tiglinate (1b) and alpha-methylcinnamate, however, are hydrogenated only by that reductase which is different from the butyryl-CoA dehydrogenase.

Butyrates↗