Flux pinning, granularity and the irreversibility line of the high-Tc superconductor HgBa2CuO4+x
Article Abstract:
Superconductivity was discovered at 94 K in the single-CuO2-layer compound HgBa2CuO4+x (Hg-1212 and Hg-1223), which has led to the seeking of new high transition temperature (high-Tc) superconductors. The large scale use of high values of intergrain critical current requires good electromagnetic connectivity between grains and the material used should be able to maintain its current-carrying capacity in fields which are highly magnetic. Investigations revealed that the small CuO2 layer spacing of Hg-1201 may yield a high H*(T). The granularity in Hg-1201, can be removed by a high degree of grain alignment.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Pinning down phosphorylated tau
Article Abstract:
It has been possible to establish an interaction between phosphorylated tau and Pin1, a prolyl isomerase. It was found that Pin1 binds to hyperphosphorylated tau from the brains of people with Alzheimer's disease but not to tau from age-matched healthy brains. However, it may be too soon to state that Pin1 interacts only with hyperphosphorylated (pathological) tau. It was possible to detect endogenous Pin1 in the paired helical filaments from diseased brains.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Old-timer makes a comeback
Article Abstract:
Edwards and colleagues have proposed an identity for endothelium-derived hyperpolarizing factor (EDHF). They suggest that potassium ions (K+), in small arteries of the rat, lead to hyperpolarization caused by acetylcholine in the presence of endothelial cells. The results, proposing K+ as EDHF, may explain previous work showing that Na+-K+ exchanges lead to responses by arteries to acetylcholine.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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