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Biomedical subjects

A Stelzner

Publications and source records attributed to A Stelzner.

At least 55 records · Page 3Linked to original sources
PubMed1989

[The anticomplementary effect of animal sera--a contribution to the precise definition of the complement-binding reaction].

Photometric procedures (standardised complement fixation reaction) were used to determine the anticomplementary action of animal sera. Multiplication factors, K, of 3.0 to 5.0, related to human sera, were recorded and were found to be capable of reducing or offsetting anticomplementary serum action in CFR in terms of a definitive complement excess. Anticomplementary action of animal sera, for all practical purposes, does no longer apply to dilution ratios of 1:16. The complement excess necessary for titres of 1:4 and 1:8 should be precisely defined and can then be calculated in constant measures. Hence, titres of 1:8 may be rendered accessible to safe assessment. Titres of 1:4 will continue to be problematic. The following order of animal sera was defined in comparison to human sera: cattle, pigeon, duck, sheep, cat, turkey, swine, coypu, hen, dog.

Animals↗
PubMed1988

[Experimental studies of in vitro IFN induction by different polynucleotides in human cell culture systems].

Several polynucleotides were tested for interferon induction in comparison with the standard Poly (IC) in human diploid fibroblasts and in human leukocyte suspensions. We received high IFN-titre following superinduction of the polynucleotides in human fibroblasts. These results show that under superinduction conditions partly 3 times more interferon is induced in comparison with the standard inductor Poly (IC). The tested concentration of 10 micrograms/ml polynucleotides did not result in any IFN yields or only in very low ones in human leukocytes, which were only within the range of detectability.

Cells, Cultured↗
PubMed1988

[Comparative studies of bronchial secretions in children with chronic, nontuberculous lung diseases. 3. The detection of lysozyme, transferrin, alpha 1-antitrypsin, alpha 2-macroglobulin, haptoglobin and alpha 1-acid glycoprotein].

In 166 bronchial secretions from 63 children with chronic nontuberculous lung diseases lysozyme, transferrin, alpha 1-antitrypsin, alpha 2-macroglobulin, haptoglobin and alpha 1-acid glycoprotein were estimated. In patients with hard bronchoscopic or bronchographic alterations a reduction of lysozyme, alpha 1-antitrypsin and alpha 2-macroglobulin could be found. These proteins were measured more frequently in cases with dark altered mucosa. Moreover no relation could be found between transferrin, alpha 1-antitrypsin and alpha 2-macroglobulin and the outbreak of the diseases. -In bacterial contaminated secretions transferrin could be demonstrated more frequently in comparison with sterile bronchial secretions.

Adolescent↗
PubMed1988

[Comparative studies of bronchial secretions in children with chronic, nontuberculous lung diseases. 2. The detection of IgA, sIgA, IgG, IgM and albumin].

The aim of the present study was to estimate some proteins in bronchial secretions from children with chronic nontuberculous lung diseases. In 166 samples from 63 children the immunoglobulins IgA, sIgA, IgG, IgM and albumin were measured. With rising deterioration of the state of the disease IgG, IgA and albumin were found to be increased, maximal values were observed in patients with dark altered mucosa. With increasing duration of the disease and in comparison with relapsing and deforming bronchitis IgA and sIgA are elevated in patients with chronic bronchitis. The other proteins had a decreasing tendency. In comparison with the later states of illness in sucklings with beginning of the lung disease IgA and sIgA could be estimated less frequently.

Adolescent↗
PubMed1988

[Comparative studies of bronchial secretion in children with chronic, nontuberculous lung diseases. 1. Methodico-technical studies of secretion collection and interpretation of the results].

The aim of the present study was to estimate different proteins in 166 bronchial secretions from 63 children with chronic nontuberculous lung diseases. In a first publication some methodological problems as the age of patients, the position of the bronchoscope, the bronchoscopic and bronchographic situation resp. and the mode of extraction are analysed. With increasing age the concentration of sIgA is elevated - in contrast to the IgG concentration. Only in severe diseases albumin declines with increasing age. Some variations in the concentration of proteins have been observed in relation to the position of the bronchoscope and in regard to a repeated extraction of bronchial secretions. No important differences in the concentration of proteins have been found in secretions obtained during diverse days. The different protein patterns in the bronchial secretions could be explained only partly by variations in the course of diseases.

Adolescent↗
PubMed1988

[Bacteriological findings in bronchial secretions of children with chronic, nontuberculous lung diseases and their relationship to local transferrin values].

In 142 bronchial secretions from 63 children with chronic nontuberculous lung diseases the content of transferrin was studied. In 68 samples (= 48%) transferrin has been found in concentrations between 0.1 and 13.9 mg/100 mg total protein. Fifty six of the secretions were analysed bacteriologically, microbes have been isolated in 37 of them (66%). Of the detected bacteria 5 species were considered as potentially pathogenic. The bacterial growth has been shown more frequently in secretions of patients with heavily inflamed bronchial mucosa. In bacterially contaminated secretions the occurrence of transferrin was reduced.

Bacteria↗
PubMed1987

[Microbiologic aspects of inflammatory joint diseases].

Regarding of microbiological aspects of arthritis three forms of joint diseases are under investigation: the septic arthritis, the reactive arthritis and the Rheumatoid Arthritis. In 95% of patients with septic arthritis microorganisms as causative agents responsible for the disease are described: Staphylococci, Streptococci, some gram-negative bacteria. By an haematogenic route of infection predominantly patients with immunosuppressive therapy are altered. In newborns and children septic arthritis is to observe more rarely. A reactive arthritis is a postinfectious sterile process in dependence on an infection occurred at an earlier time. As etiologic agents Yersinia, Enterobacteriaceae and Campylobacter have been discovered. 80% of the patients suffering such a reactive arthritis are carrier of the HLA-B27 system. The etiology of the Rheumatoid Arthritis is an open, unanswered problem. Of importance are: immunogenetic conditions, autoimmune phenomena, endocrinologic, dietetic and psychologic factors as well as bacteria and viruses as causative agents: cocci, bacilli, Diphteroids, endoparasitic bacteria (Listeria, L-forms, Mycoplasma, Chlamydiae), viruses (Adeno-, Mumps-, Measles-, ECHO-, Coxsackie-A- and B-, Hepatitis-, Cytomegalo-, Para-influenza-, Retro-, Parvo- and Rubella viruses). In the last years the EBV is of interest covering the question of a distinct virus persistence in tissues and the adequate limiting factors. Perhaps a defect of the hu-IFN-gamma-system might be of immunopathological and clinical significance.

Arthritis, Infectious↗
PubMed1987

[Immunoglobulin A and its significance for mucosa immunity--a contribution to the understanding of microbial interactions].

The secretory immunoglobulin A is still dominating with regard to knowledges and further investigations of the causes of mucosal immunity. Origin, formation, structure and mode of action of s-IgA are extensively explored. In the clinical range results of researches on symptoms and consequences of selective IgA deficiency are gaining importance, increasingly. Patients with IgA defect suffer up to 40 times more frequently from allergies and autoimmunopathies. In the induction of the immune response cellular components of mucosa immunity attaining the Lamina propria and the epithelium with the effector cells of Peyer's patches play a particular role.

Animals↗
PubMed1987

Development of mathematical models for an in vitro-phagocytosis test system.

Phagocytosis tests have been carried out by many authors using different methods under different conditions. The results have been interpreted in different ways, as well sometimes with conflicting notations. In order to get to a more systematic data analysis and to separate intrinsic from methodic influences, the possibility to apply mathematical models to a phagocytosis test has been studied. In agreement with previous experiences that phagocytosis can well be represented by a mathematical treatment as Michaelis-Menten-type enzyme kinetics concerning its initial rate and by an exponential function under in vivo conditions, in vitro-phagocytosis was phenomenologically described as an analogon of an irreversible bimolecular chemical reaction. In this way, rate and capacity of phagocytosis may be quantified separately. On the basis of systematic deviations of the data from this model, modifications have been developed which could be connected with pertinent observations. The design of further experiments from preliminary results on the basis of our models is discussed.

Granulocytes↗
PubMed1987

[Serum protein determinations in patients with chronic glomerulonephritis and their mathematical-statistical analysis in relation to suitability for renal immunogram].

Different immunological parameters (immunoglobulins, complement, lysozyme, and others) were tested in the sera of 65 patients with two forms of chronic glomerulonephritis (mesangiopathic and membranoproliferative GN). The results were compared with values received from 30 healthy human beings. All the data were analyzed carefully by different statistical methods to find out parameters available for a renal immunogram. Out of 14 parameters 4 were indispensable to the GN-groups: alpha 2-macroglobulin, beta-lipoprotein, alpha 1-acid-glycoprotein, lysozyme.

Acute-Phase Proteins↗
PubMed1987

[Biological effects of coordinated compounds of transitional metals. 7. Antiviral activity of 4-methyl-2-aminopyridine palladium chloride against herpes simplex virus type 1 and type 2 in vitro and in vivo].

4-Methyl-2-amino-pyridine-palladium chloride (MAP) showed an antiviral activity against herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) in a serum-free medium under in vitro conditions. The replication of these viruses on primary rabbit testes cells was completely suppressed by 10(-5) M/l MAP. In animal tests using ABD2-mice the course of HSV-1 and HSV-2 encephalitis was not influenced by MAP indicated by mean survival time and lethality.

Animals↗
PubMed1987

Hybridoma production by electrofusion.

Description of two techniques for electrofusion of myeloma and spleen cells in order to produce a higher yield of hybridoma in comparison with the classical methods.

Cell Fusion↗
PubMed1986

[The influence of carrageenan, colchicine, 2,4-dinitrophenol, ethanol, galactose, indomethacin and liquoid on hemolytic complement activity (CH50E)].

The influence of Liquoid (0.00005, 0.00001%), Carrageenan (0.001% up to 0.000001%), Colchicine (0.01% up to 0.0025%), Indomethacin (1 X 10(-4) up to 2.5 X 10(-5) mol/1), Ethanol (10% up to 1.25%), Galactose (1 X 10(-1) up to 1 X 10(-2) mol/l) and 2.4-Dinitrophenol (5 X 10(-4) up to 1 X 10(-5) mol/l) on the total hemolytic activity of complement was tested. By Liquoid, Carrageenan, Colchicine and Ethanol in all studied concentrations an remarkable inhibition of the CH50E could be estimated. Indomethacin up to an concentration of 3.75 X 10(-5) mol/l reduced the activity partially. In contrast, Galactose and 2.4-Dinitrophenol have not influenced the complement titers.

2,4-Dinitrophenol↗
PubMed1984

[Biological activity of transition metal complexes. 5. Effect of dimethyl sulfoxide on the cytotoxic, antiviral and antitumoral properties of cis-dichlorodiammineplatinum (II): "cisplatin"].

In water or dimethyl sulfoxide solutions cis-platinum is subject of time depending solvolytic reactions leading to compounds with different biological effectivity. Whereas the inactivation of vaccinia, vesicular stomatitis and adeno virus type 5 was not changed if dimethyl sulfoxide or dimethyl formamide instead of destilled water were used as solvents, long time stored solutions of cis-platinum in dimethyl sulfoxide were tolerated by cells cultivated in vitro in 8-25 times higher concentrations in comparison with a freshly solved preparation. Their antiviral effectivity was maintained. On the other hand experiments with mice showed that simultaneously with the decrease of toxicity of an aged cis-platinum solution in DMSO also its antileukemic activity disappeared. In a 5 weeks old cis-platinum solution in destilled water antitumor activity was preserved in spite of enhanced toxicity.

Adenoviruses, Human↗
PubMed1984

[Effect of carrageenan, galactose and 2,4-dinitrophenol on leukocyte phagocytosis of Staphylococcus aureus and E. coli].

The influence of carrageenan (0.1, 0.05 and 0.01%), galactose (1 X 10(-1), 1 X 10(-2) and 5 X 10(-2) mol/l) and 2,4-dinitrophenol (5 X 10(-4), 1 X 10(-4), 5 X 10(-5) and 1 X 10(-5) mol/l) on the phagocytosis of Staphylococcus aureus SG 511 and E. coli 04/K31 by polymorphonuclear neutrophil granulocytes was studied. At the same time the capacity of the germs to grow and multiply in presence of different concentrations of the analysed compounds was tested. The phagocytosis of Staphylococcus aureus SG 511 was not inhibited by carrageenan, galactose and 2,4-dinitrophenol, but an influence on the phagocytosis of E. coli 04/K31 could be clearly demonstrated (0.1 and 0.05% carrageenan, 1 X 10(-1) mol/l galactose, 5 X 10(-4) and 1 X 10(-4) mol/l 2,4-dinitrophenol). The multiplication of Staphylococci and E. coli was not influenced by all three compounds.

2,4-Dinitrophenol↗