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Biomedical subjects

M Sekine

Publications and source records attributed to M Sekine.

191 records · Page 11Linked to original sources
PubMedDate not supplied

Metabolic engineering of cultured tobacco cells.

Construction of a gene expression system in tobacco cultured cells (BY2) was studied. A 925 bp promoter fragment of a heat-shock protein gene (HSP18.2) of Arabidopsis thaliana showed clear heat-shock response of expression of the beta-glucuronidase (GUS) reporter gene in BY2 cells. Similar results were observed in a 500 mL flask and 3-L jar fermentor. Isolation of strong promoters in BY2 cells was tried. cDNA clones, in which the mRNA level is high in log-phase cells and the copy number in the genome is low, were isolated. These clones showed high homology with F1-ATPase (mitochondria type), elongation factor 1-alpha, and a gene with an unknown function of A. thaliana (clone 27), respectively. A 5'-flanking region of clone 27 showed 6.2 times the promoter activity of the CaMV35S promoter in BY2 cells. Three cDNA clones, which are expressed in the stationary growth phase of BY2 cells, were isolated by a differential screening. These clones showed high sequence homologies to alcohol dehydrogenase, pectin esterase, and extensin. Promoters of these genes will be useful in gene expression in high cell-density culture.

Alcohol Dehydrogenase↗
PubMedDate not supplied

Synthesis of N-labeled peptidyl AMP.

This paper deals with the synthesis of a new type of N-labeled peptidyl AMP, which would be used as a good substrate for analysis of the peptidyl transfer reaction on ribosome and for co-crystallization with ribosome. 4-(Dimethylamino)azobenzene-4'-sulfonyl (Dabsyl) was selected as the labeling group. (N-Dabsylglycyl)-L-leucyl AMP was synthesized from glycyl-L-leucine via a three-step procedure.

Adenosine Monophosphate↗
PubMedDate not supplied

Decolorization of alcohol distillery wastewater by thermotolerant white-rot fungi.

To detect thermotolerant fungus strain for decolorization of alcohol distillery wastewater (WAD), 38 fungus strains were studied. Ability of ligninolytic enzyme production was examined at 35 and 43 degrees C on agar media containing 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) and MnCl2. At 43 degrees C, four of Pycnoporus coccineus strains showed their higher potential for WAD decolorization both on agar media and in liquid media. Immobilized mycelia on polyurethane foam removed total phenol about threefold higher than free mycelia did in shaking condition at 43 degrees C. Moreover, color removed by immobilized mycelia nearly 50% higher than free mycelia did.

Basidiomycota↗
PubMedDate not supplied

Combination of calcitonin and pamidronate for emergency treatment of malignant hypercalcemia.

To combine the rapid hypocalcemic effects of calcitonin with the delayed effects of pamidronate, a combination of a single dose of pamidronate and serial doses of eel calcitonin was administered to five patients with malignant hypercalcemia for 2 to 5 days. The serum calcium levels of all five patients fell within 24 h after administration of pamidronate and the first dose of calcitonin and decreased to normal within 4 days. The mean level of corrected serum calcium fell from 15.3 mg/dl (range 14.1-16.4 ) to 9.2 mg/dl (8.9-9. 6) at the nadir. No toxicity or side effects were found. The results of this study demonstrate the value of combining the rapidly acting antiresorptive and renal calciuretic effects of calcitonin with the slower, but more potent effects of pamidronate. The combination of calcitonin and pamidronate allowed rapid, long-term control of hypercalcemia and it is regarded as the first choice of treatment in severe hypercalcemia.

Adenocarcinoma↗