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Biomedical subjects

M M Müller

Publications and source records attributed to M M Müller.

At least 163 records · Page 9Linked to original sources
PubMed1980

[HDL-cholesterol in diabetes mellitus. Analysis of type of diabetes, therapy, duration of disease and metabolic control (author's transl)].

Plasma lipid and HDL-cholesterol concentrations were analyzed in 261 patients with type I (n = 90) and type II (n = 171) diabetes mellitus and related to the type of diabetes, therapy, metabolic control and duration of disease. Although atherosclerotic lesions are significantly increased in diabetics, HDL-cholesterol values were significantly lowered only in females with type II diabetes as compared with the controls. Type II diabetes on insulin therapy exhibited significantly elevated HDL-cholesterol values as compared with diabetics treated by diet or by diet and oral hypoglycaemic agents. This seems of particular interest since the latter two groups showed significantly better metabolic control--evaluated by HbA1--than the insulin-treated type II diabetics. No correlation was found between metabolic control (HbA1) and HDL-cholesterol values in patients with type I or type II diabetes mellitus. Duration of disease did not have any influence on HDL-cholesterol in type I or type II diabetics. In conclusion, HDL-cholesterol does not seem to be a suitable indicator for assessing the well-known risk of late atherosclerotic complications in diabetes mellitus.

Adolescent↗
PubMed1980

[Angiotensin converting enzyme (ACE) a bloodtest for diagnosis of sarcoidosis (author's transl)].

Serum angiotensin-converting enzyme (ACE) was studied in 50 patients with sarcoidosis (39 active, 11 inactive) as well as in 50 control patients (34 with chronic nonspecific lung disease, 9 with Hodgkin and 7 with rheumatoid arthritis). There was a significant difference of ACE activity between sarcoidosis patients (28.6 +/- 11.4) and controls (14.8 +/- 4), and also between active (32.8 +/- 11) and the inactive (21.9 +/- 5.1) sarcoidosis (p less than 0.001). Coricosteroid treatment seems to lower ACE activity in patients with sarcoidosis without offering a clue for clinical improvement. Increased ACE activity in other granulomatous disorders is being discussed. ACE activity thus proves to be a valuable test especially in differentiating active from inactive sarcoidosis.

Adrenal Cortex Hormones↗
PubMed1980

Purine metabolism of erythrocytes in myotonic dystrophy.

The uptake and subsequent metabolism of adenine and adenosine was studied with the intact erythrocytes of patients with myotonic dystrophy (MD). Washed erythrocytes of both controls and patients were incubated with 14C-labeled adenine or adenosine at 20 degrees C for 5 to 120s to characterize the uptake process. No differences in the uptake process of adenine or adenosine were observed between normal and MD erythrocytes. Formation of adenine nucleotides was determined at 37 degrees C after incubation for 30 min. Compared to controls, the incorporation of adenine into adenine nucleotides was 2.6 times higher in MD erythrocytes. This depends mainly on an increase of ATP formation. The mean ratios of ATP:ADP + AMP for normal red cells and MD erythrocytes were 0.92 and 1.39 respectively. No difference was found in the conversion of adenosine to adenine nucleotides. In spite of a normal amount of intracellular ATP a greater demand for ATP exists. This might be due to leakage of adenine nucleotides out of MD erythrocytes.

Adenine↗
PubMed1980

Adenine and hypoxanthine metabolism in phythohemagglutinin-stimulated and unstimulated human lymphocytes.

The uptake and subsequent metabolism of adenine and hypoxanthine in phytohemagglutinin-stimulated and unstimulated peripheral human blood lymphocytes, freshly prepared or cultured, were studied. To investigate the initial step of nucleic acid metabolism the incorporation of 14C-purines into the acid soluble material was examined. No preferential uptake of adenine or hypoxanthine was observed in freshly prepared and cultured lymphocytes during an incubation of 1 h. However, cultured cells utilized approximately 1/3 of the purines compared to freshly drawn cells. Within the cells 2/3 of adenine and 1/2 of hypoxanthine were metabolized to nucleotides (mainly AMP and ADP). Incubation of lymphocytes with PHA for 1 h produced in the freshly prepared cells an increase of adenine- and hypoxanthine-uptake to 191% and 153%, in 48 h stimulated cells to 158% and 132%. There was, however, no change in the relative rates of the metabolic routes though the intracellular concentrations of nucleotides formed increased with adenine as substrate to 152% and with hypoxanthine to 161% during a 1 h stimulation. In contrast no enhanced formation of acid soluble nucleotide formation could be observed with PHA stimulation during 48 h. The increased rates of purine uptake and metabolism apparent 1 h after addition of mitogen may be due to an altered transport mechanism at the beginning of the transformation as an adaptive response to the increased requirements for the synthetic processes soon to follow. Once the lymphocytes are transformed no demand of purines is necessary and the uptake and metabolism is switched off.

Adenine↗
PubMed1980

Denitrification in Low pH Spodosols and Peats Determined with the Acetylene Inhibition Method.

Potential denitrification rates were determined for predominantly acid (pH >/= 3.6) horizons of forestal, miry, and agricultural soils from 22 locations in southern Finland. The acetylene inhibition method was used with nitrate-amended water-logged soils incubated in an N(2) atmosphere containing 2.5 or 5% C(2)H(2). Complete inhibition of the reduction of N(2)O to N(2) was observed in 99.3% of the samples. The denitrification rates varied from 0.12 to 53.8 mug of N.cm.day. Correlation between denitrification rate and soil pH was highly significant: r = 0.84 on a volume basis, and r = 0.44 on a weight basis. Vegetation type and amount of soil organic matter had a minor or no effect, respectively. In spodosolized soils the rates were significantly higher for B horizons than for A horizons. These results show that denitrification can occur in acid soils.

Journal Article↗
PubMed1980

Evaluation of serum guanase in hepatic diseases.

Serum guanase activity was measured in 20 healthy adults and in 62 patients with acute viral hepatitis, chronic active hepatitis, chronic persistent hepatitis, liver cirrhosis and fatty liver. Guanase and gamma-GT in patients were elevated in 87 and 64%, respectively. Elevated guanase activities were found in most cases of acute viral hepatitis, as well as in chronic hepatopathies. In patients with acute viral hepatitis pathologic activities of guanase were found following partial or total normalization of other liver function tests.

Aminohydrolases↗
PubMed1980

[The clinical importance of glycohaemoglobin (HbA1) (author's transl)].

Glycosylated haemoglobin provides an integrative measure of long-term glycaemic levels and complements conventional glucose monitoring in the management of diabetes. The present study was determined to review nomenclature, biochemistry and the analytic methods available for measurement of HbA1. Clinical studies are reported that relate HbA1 concentrations to various parameters of glucose control, diabetes type and diabetes therapy. Moreover, this review considers nondiabetic disorders that are associated with falsely abnormal HbA1 levels and in addition, the value of HbA1 in predicting complications of diabetes and in the diagnosis of subclinical diabetes is discussed.

Blood Glucose↗
PubMed1979

[The effect of benzbromaron in gout patients with limited kidney function].

The effect of the uricosuric drug benzdromarone was investigated in 15 patients with hyperuricemia and renal failure. Benzbromarone micron was given in a dose of 80 mg/day for 6 days. The mean serum uric acid level fell from 8.9 to 4.24 mg/100 ml. After therapy uric acid concentrations in serum returned to 5.2 mg/100 ml. Renal urate elimination was increased from 487 mg/day to 831.3 mg/day; after medication urate elimination decreased to the initial values. Uric acid clearance was increased by benzbromarone from 3.97 to 11.1 ml/min, and even after therapy a uric acid clearance of 6.4 ml/min could be measured. A decrease of uric acid reabsorption from 4.73 to 2.3 mg/min was observed, after medication the reabsorption rate increased to 3.42 mg/min.

Adult↗
PubMed1979

Purine metabolism in human lymphocytes.

In peripheral human blood lymphocytes the uptake and metabolism of adenine, guanine, and hypoxanthine was investigated. This was achieved by incubation of purified lymphocytes with 14C-purine bases, separation of cells from the incubation medium by a rapid filtration technique, and subsequent separation of the acid soluble material by thin-layer chromatography. No perferential uptake for one of the purine bases was observed. In all cases only traces of 14C-purine bases not added originally and labeled nucleosides could be demonstrated. Approximately 2/3 of adenine and 1/2 of guanine or hypoxanthine were converted to nucleotides. Separation of formed nucleotides showed that adenine and guanine were metabolized mainly to their corresponding nucleotides; hypoxanthine was converted to a considerable amount to adenine nucleotides and only to a small proportion into its own nucleotides. These results demonstrate the predomonance of adenine nucleotide formation in normal human lymphocytes.

Adenine↗