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Biomedical subjects

K Grossgebauer

Publications and source records attributed to K Grossgebauer.

At least 19 recordsLinked to original sources
PubMed1995

The 'cancell' theory of carcinogenesis: re-evolution of an ancient, holistic neoplastic unicellular concept of cancer.

The 'cancell' theory of carcinogenesis is based on four assumptions: 1. that there is early evolvement of neoplastic potentials in certain unicellular eukaryotes (so-called cancell lines) by adaptive response to the various carcinogens of the primitive Earth. The process that led to the neoplastic potential is called 'early carcinogenesis'; 2. that there is transition of cancell lines to multicellular forms; 3. that there is uptake of the basic genetics and epigenetics of the cancell concept into the genomic program of multicellular entities and their conservation even in human cells, and 4. the re-emergence of the ancient cancell concept in human somatic cells in a process called 'late carcinogenesis'. According to this theory, both processes of carcinogenesis, the early one and the late one, are thought to be the result of a physiological adaptive response to the various genotoxic and nongenotoxic carcinogens.

Animals↗
PubMed1989

Prokaryotic mechanisms in eukaryotes: experimental data and speculations.

Surprising experimental data recently provided could indicate ancestral genes common to mammals and bacteria. The detection of prokaryotic structures and/or mechanisms even in higher eukaryotes shows the extreme conservation of gene structures throughout evolution. The occurrence of common structures in pro- and eukaryotes is in good agreement with the new view concerning the early steps of cellular evolution. Because of the relative paucity of research in this area, further prokaryotic features of transcription and translation process may also be evolutionarily conserved in eukaryotes.

Animals↗
PubMed1986

Demonstration of spermatozoa in the lung of an AIDS patient.

Using the DNA-binding fluorochrome, DAPI, spermatozoa and Pneumocystis carinii were easily demonstrated in postmortem lung sections of an AIDS patient. The possible practical significance of these findings is discussed.

Acquired Immunodeficiency Syndrome↗
PubMed1986

Cancer: involvement of replicative origins?

The assumption is made that movable genetic elements related to cancer are replicons and/or replicative origins. Some evidence is provided that certain mobile Alu-origins may represent candidates for precursors of chromosomal insertions. They could incorporate and interact with "fixed" chromosomal origins converting them to "procaryotic" ones. In other words, cancer is considered the result of a short and compact "re-evolution" from eucaryotic to "procaryotic" replication units.

Animals↗
PubMed1984

Ureaplasma-infected human sperm in infertile men.

The case of an infertile man with oligospermia and symptoms of urethritis-prostatitis, whose spouse had a vaginal discharge, is reported. Microbiological analysis of appropriate specimens revealed a strain of tetracycline-resistant ureaplasma urealyticum in both patients. Using the transmission electron microscope, it was possible to demonstrate spermatozoal heads "infected" with microorganisms strongly resembling ureaplasma urealyticum.

Adult↗
PubMed1983

[Microbiological analysis of the ejaculate in andrology].

Microbiological analysis of semen in andrology is mainly performed in cases of infertility and artificial insemination. In order to localize the suggested infection and to detect urethral (asymptomatic) colonization, we recommend to analyse additional specimens of the patient, i.e. urethral swabs and first portion of urine. As a rule, quantitative microbiological analysis is necessary in cases of bacteria belonging to the group of potentially pathogenic flora. In isolating pathogenic ("specific") bacteria, the detection of a few microorganisms indicates an infectious process. We recommend the careful microscopical examination of the ejaculate to detect phagocytes, abnormal spermatozoa, trichomonads, yeasts and other cells. As a rapid microscopical examination we employ the DAPI-fluorochrome-technique. Microbiological cultures should take into consideration the isolation and identification of ureaplasmas and chlamydia trachomatis. In order to achieve a comparison of microbiological results with those of other laboratories, it is essential to define the terms "significant bacteriospermia" and "significant leukocytospermia". In other words, it is necessary to introduce a borderline between contamination and infection concerning the "nonspecific" potentially pathogenic flora.

Bacteriological Techniques↗
PubMed1983

Staining of phagocytized Cryptococcus neoformans with DAPI.

The DAPI (4',6-diamidino-2-phenylindole)-fluorochrome was used to demonstrate phagocytized Cryptococcus neoformans using the mouse peritoneal cavity technique. These yeast cells were chosen because they are large and their capsules exhibit a deep yellow fluorescence which contrasts very well with the blue fluorescent nuclei of the phagocytes (preferentially macrophages). In other words, DAPI stains both, acid mucopolysaccharides and nuclear DNA. The capacity of the phagocyte nuclei to surround or even enclose the yeast cells was the most remarkable result. Generally, the application of DAPI in these phagocytosis experiments provides valuable information rapidly, easily and specifically.

Animals↗
PubMed1982

[Prostato-urethritis due to chlamydia].

One of the etiological agents of urethritis and prostatitis is Chlamydia trachomatis which reveals obligatory intracellular parasitism. Patient specimens (smears of the urethra, urine, first portion, expressed prostatic fluid, ejaculate) are centrifuged onto special cell cultures, so-called McCoy cells, and induce characteristic cytoplasmatic inclusions. Giemsa staining or DNA-binding fluorochromes (DAPI or Hoechst 33258) are suitable procedures to identify chlamydia inclusions. Serologic tests to establish infections due to Chlamydia trachomatis are only of limited diagnostic value.

Antibodies, Bacterial↗
PubMed1982

Fluorescent, DNA-binding dyes for rapid detection of Chlamydia trachomatis.

The newer DNA-binding fluorochromes DAPI (4',6-diamidino-2-phenylindole) and fluorochrome 33258 H (Hoechst) (2-[2-(4-hydroxy-phenyl)-6-benzimidazolyl]-6-(1-methyl-4-piperazyl)-benzimidazole . 3 HCl) proved useful in identifying genital strains of Chlamydia trachomatis in McCoy cells. For practical purposes, e.g. to analyse patient specimens, we recommend this technique using the fluorochromes at pH 2.0 in a final concentration of 3 micrograms/ml and non-replicative McCoy cells after fixation with alcohol-acetic acid. The application of the fluorochrome technique in demonstrating Chlamydia trachomatis-infections is recommendable because it is a) simple to perform, b) a rapid procedure, c) it corresponded well with the Giemsa staining in identifying mature inclusions, and d) it facilitates the detection of the RNA-rich early stages of chlamydial growth. For this reasons the fluorochrome technique with DAPI or 33258 H at pH 2.0 can be considered a highly specific and sensitive method for identifying Chlamydia trachomatis.

Animals↗
PubMed1982

Rapid detection of pathognomonic blood cells in patients with infectious mononucleosis.

Veneous blood-citrate samples of patients with infectious mononucleosis were stained with DAPI, a newer fluorochrome (4',6-diamidino-2-phenylindole) to demonstrate the "large atypical lymphocytes" associated with this disease. As a result of the capacity of DAPI to stain DNA and certain acid mucopolysaccharides, a rapid detection of the pathognomonic white blood cells could be achieved. Most of them revealed the well known indented or lobulated nuclei and vacuolated (foamy) cytoplasm. Others exhibited kidney-shaped nuclei, often filled with yellow-fluorescent tiny granula. In our view, the rapid, specific and sensitive DAPI-technique for detecting pathognomonic blood cells in patients with infectious mononucleosis can be considered an improved microscopic method.

Cell Nucleus↗