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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 4862-4868 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The tricontinuous structure of ABC-type triblock copolymer in bulk at equilibrium was studied by both transmission electron microscopy (TEM) and small-angle x-ray scattering (SAXS). Sample is an anionically polymerized isoprene-styrene-2-vinylpyridine triblock copolymer whose volume fraction is 0.22–0.59–0.19 and total molecular weight is 64 000. It was found that computer-simulated images based on tricontinuous structure with two parallel surfaces to the gyroid surface, which is one of the three-dimensionally infinite minimal surfaces agree well with the observed TEM images. Further, calculated diffraction patterns for the same tricontinuous structure well represent the observed SAXS intensity maps on imaging plates. These facts imply that the structure of the present triblock copolymer is the tricontinuous double gyroid structure, whose space group is I4132. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 33 (2000), S. 285-290 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The periodic tricontinuous network structure (TNS) of symmetric isoprene (I)–styrene (S)–2-vinylpyridine (P) triblock copolymers has been studied by small-angle X-ray scattering (SAXS). The observed SAXS profiles were compared with the calculated diffraction intensities based on the model electron density distributions constructed for a pair of surfaces parallel to the infinite periodic minimal surface. In the model, an imaginary minimal surface exists at the centre of the styrene labyrinth and both I/S and S/P interfaces are on the parallel surfaces, powder orientation of the model structure being assumed. The experimental SAXS patterns for the samples with different styrene volume fractions, i.e. 0.48 and 0.66, which are the lower and higher extremes for tricontinuous network structure, are well explained by the model calculation for surfaces parallel to the Gyroid minimal surface.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1436-2813
    Keywords: Metalic foreign body ; Pt-Co magnet ; brain ; internal carotid artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Two successful removals of metalic foreign body with a platinum-Cobalt magnet alloy (Pt-Co magnet) which has a size of 4×4 mm and is capable of lifting 120 g of weight were reported, one a metal fragment from the brain via a inlet track, and the other a needle from the internal carotid artery. A metal piece of motorcycle was accidentally flew in which was demonstrated by X-ray examination of the skull. Pt-Co magnet was inserted into the entrance hole on the right eyebrow under fluoroscopic control. The metal fragment of 20×4×1 mm size was pulled out with minimal damage to the surrounding brain tissues. The other was the accidental breakage of a needle tip during carotid angiography. A needle tip remained in the internal carotid artery at cranial base was successfully removed with a Pt-Co magnet inserted through the previous injection site.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Surgery today 3 (1973), S. 149-156 
    ISSN: 1436-2813
    Keywords: subarachnoid hemorrhage ; intracranial aneurysm ; early surgical treatment ; timing of surgery ; cerebral vasospasm ; consciousness of patient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract It has been commonly accepted that the intracranial direct surgery, especially of aneurysmal neck occlusion, is the most desirable treatment for the intracranial aneurysm. However its timing is still controversial. In this report, early operation for the ruptured intracranial aneurysm was advocated based on the analysis of cases, encountered until the end of December, 1970, in which direct operation was performed within 3 weeks from the last subarachnoid hemorrhage, with special reference to the causes of death. The most reliable clinical parameter in deciding the timing of intracranial direct surgery seems to be the course of patient's consciousness. Age, blood pressure, site of aneurysm, motor disturbance, cranial nerve disorder and preoperative vasospasm were less related to the surgical results. The meningeal irritation and frequency of the past subarachnoid hemorrhage were related to the surgical results to some extent only. Therefore direct operation should be performed for the ruptured intracranial aneurysm even within one week after the last attack, providing the patient is neither in a state of coma nor in a down hill course of consciousness.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Surgery today 2 (1972), S. 47-52 
    ISSN: 1436-2813
    Keywords: cerebral hemorrhage ; hemiplegia ; hypertension ; intracerebral hematoma ; transinsular approach ; operative technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A new operative procedure for intracerebral hematoma through the Sylvian fissure and the insula is described, which was used in six cases of hypertensive intracerebral hematoma. The advantage it offers and indication for the use of this procedure are compared with those of the traditional operative methods such as burr hole aspiration and large craniotomy followed by cortex incision.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Neurosurgical review 5 (1982), S. 87-90 
    ISSN: 1437-2320
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Neurosurgical review 5 (1982), S. 155-160 
    ISSN: 1437-2320
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Neurosurgical review 9 (1986), S. 279-285 
    ISSN: 1437-2320
    Keywords: Arteriovenous malformation ; cerebral protective substances ; chemical embolization ; Sendai Cocktail ; surgical treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The management of cerebral arteriovenous malformation (AVM) is discussed. A series of 231 cases of AVM was treated from 1961 to March 1984 in our department. The treatments of these cases are classified as total removal 169, partial removal 8, feeder clipping 14, embolization 4 and conservative 36. Results at discharge and at follow-up are analyzed and the treatments evaluated. At follow-up, no rebleeding is reported in the patients who had undergone extirpation. Cases treated with other methods showed rebleedings and either their condition worsened due to hemorrhages or they died. On the basis of these results, it is suggested that AVM should be extirpated totally. Our surgical procedure consisted of temporary occlusion of feeders using cerebral protective substances, so called “Sendai Cocktail” (mannitol, Vitamin E, steroid). This procedure makes complete surgery safe. Surgical results of the cases which were totally extirpated were better than those reported in previous reports: the mortality rate was 3,6%, and the morbidity rate was 5,4%. Because of this, surgical treatment was preferred, that is when the location, size of AVM, age, patient's circumstances and the surgeon's experience allow. However, there are still cases which must be treated with other therapy. These patients are withheld surgery because they have inaccessible AVM or large AVM etc., whose operation would cause neurological deficits. For the treatment of these cases we have recently attempt the chemical embolization method with conjugated estrogen. This produced good outcomes. These non-surgical treatments such as embolization and irradiation have still some unsolved problems and progress in the future is anticipated.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 178 (1988), S. 327-336 
    ISSN: 1432-0568
    Keywords: Pituitary gland ; Immunohistochemistry ; Three-dimensional reconstruction ; Rathke's pouch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In order to clarify the environmental factors which are involved in the development of the primordium of the pituitary gland such as cell-cell interactions, a three-dimensional reconstruction of this organ and its surrounding tissues was carried out. Pituitary material was obtained from human fetuses mainly during the period of organogenesis. Rathke's diverticulum was found to stretch rostrally from the stomodeal epithelium to the middle of the mesoderm, and already by the 5th week of fetal growth, it was clearly seen to be involved with the diencephalon. The area of contact between Rathke's pouch and the diencephalon gradually moved from the rostral to caudal regions and, after 13 weeks of development, had a position similar to that found in the newborn infant. Among the cells forming Rathke's pouch, it was found that the closer their relationship was to the diencephalon, the greater were their epithelial characteristics. When the relationship of such cells to the diencephalon was weaker, their differentiation to endocrine cells occurred earlier. Immunohistochemically, that portion of the pituitary primordium which has a close relationship with the diencephalon, later to become the pars intermedia, showed an adrenocorticotropic hormone (ACTH) immunoreactivity later than that of the pars anterior. On the other hand, in the 21st fetal week, nearly all of the cells of the pars intermedia were found to be ACTH-positive. This finding is thought to indicate a close connection between the physical contact between the brai (diencephalon) and the pituitary primordium and the development of the pars intermedia; the differentiation of ACTH cells. The surface of the epithelium of Rathke's cavity continues to increase at least until the 21st fetal week, so the growth of the epithelium of Rathke's pouch is thought to be heavily involved in the growth of the primordium of the pituitary gland in the early stages of development.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1433-0350
    Keywords: Moyamoya disease ; Cerebral blood flow ; Cerebral metabolism ; Re-build-up ; EEG ; Positron CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The cerebral blood flow and cerebral metabolic rate of oxygen (CBF and CMRO2) of three cases of childhood moyamoya disease were examined by positron-emission-computed tomography for the purpose of investigating the mechanism of the “re-build-up” phenomenon on EEG. Decrease in both CBF and CMRO2 were observed following hyperventilation. However, dissociation between the decrease in CBF and CMRO2 was also observed. Arterial blood-gas analysis disclosed hypocapnea during hyperventilation and hypoxia following hyperventilation. These results clearly indicate that the re-build-up seen on EEG is the manifestation not only of ischemic hypoxia but also of hypoxic hypoxia characteristically seen in moyamoya disease.
    Type of Medium: Electronic Resource
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