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Biomedical subjects

M Blume

Publications and source records attributed to M Blume.

At least 19 recordsLinked to original sources
PubMed1991

Comparison of dipyridamole-echocardiography with dipyridamole-thallium scintigraphy for the diagnosis of myocardial ischemia.

After an intravenous infusion of dipyridamole (0.56 mg/kg), we performed both echocardiography and thallium scintigraphy in 63 patients who were referred for known or suspected coronary artery disease. Of those patients, 25 returned for coronary arteriography within 1 month after the tests, thus forming the study group for this report. Sensitivity for detection of coronary artery disease, when analyzed region-by-region, was 80% for thallium scintigraphy and 57% for echocardiography, whereas specificity was 85% and 98%, respectively. When evaluating individual patients for the presence or absence of ischemia, we found a sensitivity of 95% for scintigraphy and 58% for echocardiography; corresponding specificities were 50% and 100%. By using arteriography as the gold standard for comparison, it appears that thallium scintigraphy has a significantly higher sensitivity but lower specificity for the detection of coronary artery disease than does echocardiography. Echocardiography may, however, be a useful adjunct to thallium scintigraphy in the evaluation of patients with coronary artery disease.

Coronary Disease↗
PubMed1990

Coexpression of biologically active simian immunodeficiency virus (SIV) Rev and Env in an SV40 system: the SIV rev gene regulates env expression.

The coexpression of biologically active simian immunodeficiency virus (SIV) Rev and Env gene products was obtained in COS-1 cells from a single SIV subgenomic segment (which contains both exons of rev and the entire env gene) cloned into a SV40-directed vector. The SIVsm Rev trans-activated the expression of the full-length env mRNA and was required for the production of envelope glycoproteins. Furthermore, the alignment of the structural conservation of the Rev functional domains among all HIV and SIV was analyzed.

Amino Acid Sequence↗
PubMed1990

The simian immunodeficiency virus (SIV) rev gene regulates env expression.

The rev gene product is a trans-acting nuclear regulatory protein that is essential for AIDS virus replication. To define the effect of the SIV rev gene on its gp160 expression, two SV40 constructs have been made: pBC17 is a rev+env+ construct, and pBD21 is a rev-env+ construct. After transfecting the constructs into COS-1 cells, RNA, protein, syncytium formation, and monoclonal antibody blocking assays were performed. The results indicated that the SIV rev gene positively influenced the level of full-length env mRNA and was required for expression of SIV gp160.

Antibodies, Monoclonal↗
PubMed1989

Characterization of the simian adenovirus type 30 inverted terminal repeat.

The presence of an inverted terminal repeat (ITR), which plays an important role in the initiation of DNA replication, is one of the characteristic properties of adenoviruses (Ads). We have established the nucleotide (nt) sequences for the ITR of simian adenovirus type 30 (SV30), a subgroup-III oncogenic virus. This repeat consists of 185 nt, representing the longest ITR found in an Ad so far. It contains multiple copies of internal repeats, as well as the consensus sequences of the putative binding sites for replication and transcription factors. The conserved features of the known ITRs are also found in SV30. Interestingly, the ITR of SV30 is more closely related to that of Ad5 (human), than to that of SA7 (simian).

Adenoviridae↗
PubMed1988

Isolation of a human cDNA of urokinase and its expression in COS-1 cells.

The cDNA encoding human urokinase (UK) has been isolated from a cDNA library prepared from human normal fibroblast (WI38) cells, which had been stimulated by endothelial cell growth factor and heparin. This cDNA was sequenced and found to contain a few silent substitutions, thus encoding the same amino acids as deduced from the published genomic sequence of UK. After modification, the cDNA of UK was inserted into a transient expression vector and used to transfect COS-1 cells. The recombinant UK protein (rUK) in the serum-free medium of transfected COS-1 cells was characterized by biochemical and functional assays. These studies indicated that rUK from COS-1 cells is glycosylated, enzymatically active, and very similar to native single-chain plasminogen activator (scuPA). Therefore, such rUK can be a convenient source of scuPA for any further studies.

Amino Acid Sequence↗
PubMed1988

[Animal experiment studies of hemostasis using the fibrinogen adhesive system on the liver and spleen in coagulation disorders].

Fresh resection areas after partial resection of liver and lien in rabbits were repaired and sealed by a fibrin film on conditions of hemorrhagic tendency and increased fibrinolysis. A strong damage in the wound area in the same way as in organic injury originates from these pathologic conditions. A premature demarcation of the external wound strata especially in raised fibrinolysis takes place by reason of the parenchymal necrosis though the fibrinogen is cross-linked to an intact film independent of the common circulation and clotting relations. An abundant wound revision is recommended before using the fibrin adhesive to prevent an after-bleeding.

Animals↗
PubMed1987

[The auxiliary transplantation of a portion of liver in an animal experiment].

The authors inform about a model for auxiliary liver part transplantation in pig. Intra-abdominal narrowness which can lead to failure of the transplant can avoided by this model. In the transplant was carried out an extensive left resection with purse-string ligature of all visible vessels and cystic ducts. The resection surface is sealed by a tissue adhesive. An auxiliary transplanted part of the liver can also operate on a heterotopic location of the organism.

Animals↗
PubMed1981

[Effect of discontinuous hemorrhage on plasma and cerebrospinal fluid vasopressin concentration in anesthesized rabbits].

Repeated withdrawal of 15 ml arterial blood at 10 min intervals produced marked hypovolaemia and hypotension with plasma vasopressin concentration increasing exponentially from 53 microE/ml to more than 700 microE/ml contrary to the hypovolaemia. After the first blood withdrawal there exists a linear correlation between the increase of the plasma vasopressin concentration and the decrease of the mean arterial blood pressure. With 61.5 microE/ml the cerebrospinal fluid withdrawn following the last bleeding likewise showed a very high vasopressin level. After extraction of the hormone from plasma and cerebrospinal fluid the vasopressin concentration was determined by means of the antidiuretic bioassay in the water-loaded rat.

Animals↗