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Factors influencing the development of Moyamoya Phenomenon (1981)

Takeuchi, K. ; Hara, M. ; Yokota, H. ; [et al.]

Springer

Acta neurochirurgica 59 (1981), S. 79-86

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ISSN: 0942-0940

Keywords: Moyamoya phenomenon ; carotide artery occlusion ; intracranial vasospasm ; subarachnoid haemorrhage ; ruptured intracranial aneurysm

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Both the Moyamoya Phenomenon and occlusion of the internal carotid fork are essential radiological findings in true Moyamoya Disease of unknown aetiology. However, the Moyamoya Phenomenon is often observed in occlusive diseases of the internal carotid bifurcation of known aetiology. The authors recently observed acute development of the unilateral Moyamoya Phenomenon following severe vasospasm of the anterior and middle cerebral arteries due to rupture of an anterior communicating aneurysm. The following four factors have been suspected of contributing to development of the Moyamoya Phenomenon: 1. The chronology of arterial occlusion. 2. Extent and location of occlusion. 3. The cause of occlusion. 4. Anatomical and functional disposition of the basal circulation. As regards the chronology, chronic or slowly progressive arterial stenosis has been thought to be a mandatory factor in development of a Moyamoya network, which plays an important role in the form of collateral channels. However, based on the findings outlined in this paper, the congenital factor may be the most important of the four factors.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01411194

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A review of miscibility enhancement via ion-dipole interactionsPresented in part at ACS meeting, St. Louis (April 1984) and reported in macromolecules. (1984)

Eisenberg, A. ; Hara, M.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 24 (1984), S. 1306-1311

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ISSN: 0032-3888

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: It is shown that ion-dipole interactions induce considerable miscibility enhancement in blends of styrene ionomers with poly(alkylene oxides). Dynamic mechanical studies, in conjunction with transparency and brittleness of the samples, are used to evaluate miscibility. The effect is clearly thermodynamics in that phase separation can be induced in miscible samples by raising the temperature, with miscibility reestablished ons cooling. The miscibility enhancement in these systems is compared with that resulting from hydrogen bonding. In addition to the styrene/alkylene oxide system, ion-dipole interactions are found to be effective in enhancing the miscibility of many ionic polymer/polar polymer pairs. The ionomers used in this study were styrene lithium methacrylate and ethyl acrylate lithium acrylate copolymers, while polyethers, polysulfides, polyesters, polyimines, and substituted polyethylenses served as polar polymers.

Additional Material: 3 Ill.