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679 results on '"Katsube, T."'

4. Permeability of fine-grained rocks: new evidence from chalks

Author

Mallon, Anthony J., Swarbrick, Richard E., and Katsube, T. John

Subjects
North Sea -- Natural history, Chalk -- Forecasts and trends, Rocks -- Permeability, Rocks -- Analysis, Market trend/market analysis, Earth sciences
Abstract

The first set of permeability measurements on North Sea chalk (porosity 5%-20%) using the transient pulse decay method shows that its permeability is similar to that of silicielastic mudrocks ([10.sup.-22] to [10.sup.-18] [m.sup.2]) over the porosity range of 5%-20% and is as much as three orders of magnitude below the lowest measurements previously reported for chalk. Such low permeability allows these rocks to act as highly effective aquitards and allows pore pressures to increase from hydrostatic to near lithostatic. Measurements were made in nonreservoir, non-hydrocarbon-bearing chalk, which comprises >90% of the chalk succession of the North Sea in a gross interval of >1 km. Previously published permeability values for chalk from the area are predominantly from the hydrocarbonbearing reservoirs, where the fact that the permeability is generally at least four orders of magnitude higher renders them ineffective at sustaining fluid pressures above hydrostatic. Permeability is uniformly low across a range of facies and insoluble residue and shows a weak relationship with porosity. Keywords: permeability, chalk, North Sea, aquitard.

Published
2005

6. Effects of N-alpha-methyl-histamine on human [H.sub.2] receptors expressed in CHO cells. (Helicobacter Pylori)

Author

Saitoh, T., Fukushima, Y., Otsuka, H., Ishikawa, M., Tamai, M., Takahashi, H., Mori, H., Asano, T., Anai, M., Ishikawa, T., Katsube, T., Ogawa, K., Kajiwara, T., Omata, M., and Ohkawa, S.

Subjects
Gastric mucosa -- Physiological aspects, Histamine -- Physiological aspects, Helicobacter pylori -- Physiological aspects, Stomach -- Secretions, Gastric juice -- Physiological aspects, Health, Physiological aspects
Abstract

Background: Production of N-alpha-methyl-histamine (NAMH), a histamine [H.sub.3] receptor (H3R) agonist, is reportedly promoted in Helicobacter pylori infected human gastric mucosa. NAMH was suggested to act directly on histamine [H.sub.2] [...]

Published
2002

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