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Biomedical subjects

G Wallner

Publications and source records attributed to G Wallner.

46 records · Page 3Linked to original sources
PubMed1991

A novel eubacterial phylum: comparative nucleotide sequence analysis of a tuf-gene of Flexistipes sinusarabici.

A tuf-gene of Flexistipes sinusarabici has been cloned and sequenced. The primary structure of the predicted elongation factor protein was compared with available sequences of homologous genes and elongation factors Tu or 1 alpha of eubacteria, archaebacteria and eukaryotes. Based on elongation factor Tu data Flexistipes sinusarabici belongs to the eubacterial kingdom but no specific relationship to any phylum was detected. The amino acid of the elongation factor Tu of F. sinusarabici exhibits no striking pecularities. Among the highly conserved positions only two are different. Sites of known or postulated functions are conserved.

Amino Acid Sequence↗
PubMed1991

Sequence of the genes encoding the structural proteins of the low-virulence tick-borne flaviviruses Langat TP21 and Yelantsev.

The structural protein coding regions of the genomes of Langat virus (strain TP21) and Yelantsev virus, which was originally described to be a low virulence natural isolate of tick-borne encephalitis virus, were cloned and sequenced. These viruses had both been used as experimental live vaccines against tick-borne encephalitis in Czechoslovakia and Russia, respectively. Peptide mapping and monoclonal antibody binding experiments yielded identical reaction patterns for Langat virus and Yelantsev virus which were distinct, however, from the pattern obtained with tick-borne encephalitis virus. Sequence analysis confirmed this distinctiveness and proved that the vaccine strain Yelantsev was also Langat virus. The envelope protein E of both viruses exhibits an 88% amino acid sequence homology with that of tick-borne encephalitis virus. Assessment of the antigenic reactivity and sequence comparison with the E protein of tick-borne encephalitis virus revealed several differences affecting epitopes involved in virus neutralization. These observations suggest that Langat-like virus-based vaccines may not represent the most effective means to achieve protection against tick-borne encephalitis virus.

Amino Acid Sequence↗
PubMed1991

Identification of single bacterial cells using digoxigenin-labelled, rRNA-targeted oligonucleotides.

Oligonucleotides were end-labelled with digoxigenin (DIG), chemically at the 5'-end or enzymically at the 3'-end. Following specific in situ hybridization of these probes to intracellular rRNA molecules, the hybrids were detected with anti-DIG Fab fragments labelled with fluorescent dyes. The antibody fragments penetrated through the bacterial cell periphery and specifically bound to their antigens. Probe-conferred and non-specific fluorescence per cell were quantified by flow cytometry and compared to values obtained with end-labelled fluorescent probes. The DIG reporter molecules could also be detected in whole fixed cells by antibodies labelled with either alkaline phosphatase or horseradish peroxidase. The penetration of the large antibody-enzyme complexes into the cells required lysozyme/EDTA treatment prior to the hybridization and has so far only been achieved for Gram-negative bacteria. This technique has the potential for significant signal amplification as compared to the fluorescently end-labelled oligonucleotides hitherto used for single cell identification in microbial ecology. Moreover, it can be used instead of fluorescent assays in natural samples showing autofluorescence.

Antibodies, Bacterial↗
PubMed1990

[Prevalence of malignancy in preoperatively undetermined solid round lesions].

We report on 20 patients submitted to surgery, with an average age of 53.9 years (+/- 8.8), in whom solitary pulmonary nodules were not amenable to preoperative diagnosis on the basis of biopsy material. It was shown that 35 per cent of the unclear solitary lesions were malignant. Provided that the medical risks of surgery can be justified, surgical clarification via a thoracotomy in patients in this age group is indicated.

Diagnosis, Differential↗
PubMed1989

[Effect of stress ulcer prevention on the incidence of ventilation pneumonia at a pulmologic intensive care unit].

In a retrospective analysis, the influence of stress ulcer prophylaxis on the incidence of ventilation pneumonia (VP) was investigated. In VP, we were able to isolate enterobacteria from the tracheal aspirate or bronchial secretion significantly (p = 0.015) more frequently than in the case of environmentally acquired and nosocomial pneumonia which were treated in the intensive care unit but did not comply with the criteria for VP. The detection of intestinal bacteria in the respiratory tract in VP patients supports the hypothesis that the "gastro-pulmonary" colonisation pathway represents a decisive factor in the development of VP. Patients undergoing long-term ventilation who had received ranitidine for prophylaxis of stress ulcer, developed VP statistically significantly more frequently (p = 0.044) than did patients with sucralfat cover. The non-physiologically high acid juice pH associated with the use of H2-antagonists leads to an increase in intestinal organisms within the stomach. By ascending the upper GI tract, the bacteria finally colonise the respiratory tract. Through the application of sucralfat, whose ulcerprotective action is not achieved by the inhibition of acid in the stomach, the incidence of VP in a pulmological intensive care unit was reduced.

Adolescent↗
PubMedDate not supplied

Evaluation of the ChemScan system for rapid microbiological analysis of pharmaceutical water.

The ChemScan system is a new method for the rapid detection and enumeration of viable microbial cells. It is based on the fluorescent labeling of viable microorganisms collected on a filter membrane and their subsequent automated detection and enumeration by a laser-scanning instrument. The new method was evaluated for the testing of pharmaceutical water by comparison with the standard plate count method. The ChemScan system appeared to be at least as sensitive as the standard method. In some cases the results were equivalent for both methods, but for most water samples the ChemScan results were higher than the standard plate count and sometimes exceeded the latter by an order of magnitude or more.

Drug Industry↗
PubMedDate not supplied

Angiogenesis inhibitors. New anticancer strategy.

Neoangiogenesis has been proved to be crucial in neoplasmatic tumor growth and metastases. Over the last few years, the factors that have both a positive (angiogenic) and negative (antiangiogenic) influence on tumor growth have been identified. The potential use of natural and synthetic factors that suppress vasculature formation as anticancer drugs is currently under intense investigation. Recently, several antiangiogenic compounds, including TNP-470 or matrix metalloproteinase inhibitors, have entered clinical trials. This review will describe the main groups of angiogenesis inhibitors, their mechanisms of action and some data from clinical studies.

Angiogenesis Inhibitors↗