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Biomedical subjects

B Klein

Publications and source records attributed to B Klein.

At least 379 records · Page 21Linked to original sources
PubMed1978

Anion-exchange chromatography of erythrocytic and muscle adenylate kinase and its effect on the serum creatine kinase isoenzyme assays.

We determined the elution profile of erythrocytic and muscle adenylate kinases (EC 2.7.4.3) in the Roche chromatographic creatine kinase procedure and studied the interference these enzymes would cause in the isolation and assay of serum creatine kinase (EC 2.7.3.2) isoenzymes. Both adenylate kinases co-elute with the creatine kinase MM fraction and do not interfere with the isolation or assay of the MB fraction.

Adenylate Kinase↗
PubMed1978

[Clinical pantographic studies on "immediate side shift"].

The immediate side shift was pantographically recorded, photographed and measured in 32 volunteers with mostly complete dentures. 28 showed initial Bennett movement up to 0.4 mm under tooth contact. Values of between 0.4 and 1.5 mm were demonstrable in only 4 cases. Comparing these investigations in 10 volunteers with and without central supporting peg a clear decrease in measurements could usually be demonstrated.

Adult↗
PubMed1977

Transmission and scanning electron microscopy study on plasma cell leukemia.

The peripheral blood cells of a patient with acute plasma cell leukemia were examined with transmission (TEM) and scanning (SEM) electron microscopes. The TEM features of the immature plasma cells comprised lobulated and irregulary shaped nuclei, with scanty heterochromating and bizarre nucleoli, parallel arrays of endoplasmic reticulum, cytoplasmic fibrils and numerous polymorphic mitochondria. SEM examination of the cells showed long, thin irregular ruffles, or round blebs on the cell surface, with appearance different from this observed on other types of leukemia. A remarkable clinical and hematological remission was achieved with administration of melphalan and steroids.

Acute Disease↗
PubMed1977

Studies of bone and soft-tissue tumours induced in rats with radioactive cerium chloride.

A colloidal suspension of radioactive cerium chloride was inoculated into the hind legs of Sprague Dawley rats. Bone and soft-tissue tumours were induced at the site of inoculation in 77% of the animals. All bone tumours were osteogenic osteosarcomas. Soft tissue tumours were mostly malignant and were of various histological types, predominantly fibrosarcomas, haemangiopericytomas, angiosarcomas and rhabdomyosarcomas. A kinetic study showed that the doubling time (DT) of tumours was closely correlated with the anatomical site of tumour development: bone tumours had a DT of 17.4 +/- 4.3 days and malignant tumours which developed in soft tissues had a DT ranging from 7.4 to 8.4 days with the exception of two haemangiosarcomas which had a long DT of 17 +/- 0.6 days. Pulmonary metastases were frequent for osteosarcomas and tumours of vascular origin. This model of induction of bone and soft-tissue tumours in rats by injection of a colloidal suspension of radioactive cerium chloride offers the possibility of more comprehensive physiopathological and kinetic studies of these tumours and may constitute a good model for their human counterparts.

Animals↗
PubMed1977

Induction in rats of paranasal sinus carcinomas with radioactive cerium chloride.

A colloidal suspension of radioactive cerium stabilized in the form of hydroxide was inoculated into young Sprague-Dawley rats near the maxillary sinus. Well-differentiated epidermoid carcinomas of the paranasal sinus were obtained in 8 of 12 rats and in 8 of 9 animals that liver more then 200 days. Therefore, this istope was highly effectivein inducing tumors at the site of injection. The uniformity of the histologic type of tumors induced under these experimental conditions was remarkable.

Animals↗
PubMed1977

Ph1-positive acute lymphocytic leukemia with chromosome 7 abnormalities.

A 56-yr-old woman with acute lymphocytic leukemia showed the presence of a Philadelphia chromosome in 90% of the bone marrow metaphases and in 10% of the peripheral blood metaphases. Part of the long arm of a G22 chromsome was translocated to the long arm of a C9 chromosome. A second cytogenetic abnormality was found in chromosome 7. Monosomy 7 was found in 60% of the marrow and in 20% of the peripheral blood metaphases. Chromosome 7q- was also found in a small percentage of the metaphases examined. Three months later, when the patient was in partial remission, only 10% of the marrow cells showed chromosome 7 monosomy and a Ph1 chromosome. During complete remission, no chromosomal abnormalities were found, except for a high breakage rate. The finding of a Ph1 chromosome in acute lymphocytic leukemia indicates that different precursors, both granulocytic and lymphocytic, may be involved in the Ph1 process.

Cell Transformation, Neoplastic↗
PubMed1977

Studies on erythroid-committed precursor cells in the polycythaemic mouse.

The erythropoietin responsiveness of mice maintained in a polycythaemic condition for 42 days by transfusion of syngeneic red blood cells (but otherwise untreated) remained unchanged throughout the whole of that time. Furthermore the cycling rate, as measured by 3H-thymidine killing, also remained unchanged. These results indicate that continuous production and amplification of erythropoietin-responsive cells continues for long periods in the absence of demand for mature erythrocytes. It has also been shown that the erythropoietin response in the experimentally-induced polycythaemic mouse can be transiently increased as a result of "priming" injections of EPO. This suggests that the size of the erythropoietin-responsive cell (ERC) population has been increased, presumably by inducing extra division in the pre-ERC during maturation. This has previously been shown to occur only under conditions of drug induced depletion of both CFU-S and of ERC.

Animals↗
PubMed1977

Separation of serum creatine kinase isoenzymes by ion-exchange column chromatography.

We describe a practical, technically convenient DEAE-Sephadex chromatographic column and a three-fraction salt-gradient elution procedure, with which serum creatine kinase activity is rapidly and quantitatively separated into the isoenzyme components with excellent analytical recovery of the total activity applied. The homogeneity of the isoenzyme fractions was demonstrated by electrophoresis and rechromatography. Sera assessed by the Mercer fractionation [Clin. Chem. 20, 36 (1974)] and the present procedure showed excellent agreement.

Chromatography, Ion Exchange↗