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  • 1
    ISSN: 0942-0940
    Keywords: Cerebral infarction ; brain swelling ; mannitol ; glycerol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using our previously published “incomplete cerebral hemispheric infarction model in dogs” (produced by simultaneous ipsilateral occlusions of the anterior cerebral artery at the branching of the ethmoidal artery from its A1 portion, the A2 portion, the internal carotid artery, the posterior communicating artery, the posterior cerebral artery, and the anterior cerebellar artery), two, four, or six hours occlusion of blood flow was undertaken. Observations were then made on the degree of brain swelling following recirculation due to administration of mannitol or glycerol solutions. Furthermore, the leakage of Evans blue was investigated to determine the damage to the blood brain barrier. 1. In the animals given mannitol or glycerol, brain swelling was suppressed, following two hours occlusion. In the animals given mannitol, however, brain swelling was not suppressed after four or six hours occlusion. 2. After two hours occlusion in the animals given mannitol, leakage of Evans blue was slight compared with the untreated group. In the six hours occlusion groups, severe leakage of Evans blue was seen in both the untreated animals and the mannitol-treated animals. After two hours occlusion, in some animals which had been given glycerol, severe leakage of Evans blue was seen, even when there was little brain swelling.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 62 (1982), S. 259-264 
    ISSN: 0942-0940
    Keywords: Trapped fourth ventricle ; arteriovenous malformation ; hydrocephalus ; ventriculo-peritoneal shunting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of cystic dilatation of the fourth ventricle which developed after surgery on an arteriovenous malformation is presented with a discussion of the pathogenesis of the trapped fourth ventricle.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 63 (1982), S. 185-191 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary During the period between 1978 and 1980, 43 patients with cerebral aneurysms were operated on within 48 hours of their last subarachnoid haemorrhage. The operative mortality rate of these cases was 2.3%. Based on our own success and failure in direct operation on ruptured cerebral aneurysms, we discuss our surgical methods and conceptions concerning surgery on ruptured aneurysms in the peracute stage.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0942-0940
    Keywords: Cerebral ischaemia ; mannitol ; fluorocarbon emulsion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using the “canine model of complete ischemic brain regulated with a perfusion method” in which it is possible to control the degree of blood flow to a cerebral hemisphere via a perfusion pump, the effects of mannitol (which acts as a free radical scavenger) and fluorcarbon emulsion (FC) (which has 0.1 μm of average particle size and a high oxygen-carrying capacity) on cerebral ischaemia were investigated. After pretreatment with the drugs, blood flow was reduced via the pump to 1/10 the normal state and 1 hour later, return to a normal state allowed. Subsequent changes in electrical activity were observed and the effects of the drugs evaluated. In the control group, no recovery of electrical activity was seen, but in the animals treated with either mannitol or FC, incomplete, yet distinct recovery was apparent. In the animals administered mannitol together with FC, however, marked recovery was evident. These experimental results indicate that the combined administration of mannitol and FC is effective in protecting the brain from cerebral ischaemia.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 57 (1981), S. 121-127 
    ISSN: 0942-0940
    Keywords: Meningioma ; third ventricle ; computed tomography ; operative procedure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors report a rare case of a giant meningioma in the third ventricle operated on by the transcallosal approach following bifrontal craniotomy. The CT findings and the operative procedures are discussed.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 62 (1982), S. 187-193 
    ISSN: 0942-0940
    Keywords: Cerebral vasospasm ; oxyhaemoglobin ; prostacyclin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Prostacyclin (PGI2), a strong vasodilator of cerebral vessels and potent inhibitor of platelet aggregation, was infused intravenously into seven cats after induction of prolonged vasospasm by hourly application of oxyhaemoglobin solution into the subarachnoid space round the basilar artery. PGI2, at a concentration of 50 ng/kg/min, was effective in releasing the vasospasm in the seven cats. It did not produce significant hypotension. This report gives our results and the probable mechanism of action of PGI, in cerebral vasospasm.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 58 (1981), S. 149-160 
    ISSN: 0942-0940
    Keywords: Brain swelling ; mannitol ; perfluorochemicals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using the incomplete cerebral hemisphere infarction in dogs, we have been able to produce brain swelling in all animals after six hours of vascular occlusion followed by recirculation of blood. The current study tested the effects of mannitol, perfluorochemicals (FC), and inhalation of oxygen in various combinations on such brain swelling. 1. Mannitol alone, FC alone, and FC together with oxygen were ineffective. Mannitol together with oxygen was to some extent effective in suppressing brain swelling. 2. Mannitol followed by FC was effective in suppressing brain swelling, and this effectiveness was further enhanced by inhalation of oxygen. 3. Noteworthy is the fact that among these experimental groups, there were animals in which brain swelling was severe, yet extravasation of Evans blue was slight and, contrarily, animals in which brain swelling was slight but extravasation severe.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Polyethylene glycol-modified enzymes dissolved and had high enzymic activity in organic solvents. A trace amount of water was found to be necessary for the activity. It was reasoned that the amphipathic polymer covalently attached to enzymes kept water molecules around them. This was supported by findings that : (1) high enzymic activity was found in water- immiscible solvents, whereas activity was never observed in water-miscible solvents; (2) enzymic activity was inhibited by increasing the concentration of dimethyl sulfoxide in benzene; (3) activity of lipase was inhibited by a water-miscible alcohol substrate, but was steadily elevated by increasing the concentration of a water-immiscible alcohol substrate; (4) water was not absorbed from benzene solution containing a modified enzyme by molecular sieves, while it was easily absorbed in the presence of a water-miscible organic solvent, dimethyl sulfoxide.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Lipoprotein lipase modified with polyethylene glycol dissolved in benzene, and catalyzed various reactions of ester synthesis, ester exchange and aminolysis. This modified enzyme had a high stability; 50% of the initial enzymic activity were retained after about 3 months-storage in benzene at room temperature. We can repeatedly re-use the enzyme by recovering from benzene solution; the enzyme precipitates upon addition of n-hexane(or petroleum ether).
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Acta mathematica hungarica 36 (1980), S. 19-24 
    ISSN: 1588-2632
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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