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  • 11
    Electronic Resource
    Electronic Resource
    Study of microstructure of chrysotile asbestos by high-resolution electron microscopy (1971)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 27 (1971), S. 659-664 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Several samples of chrysotile asbestos from different localities, including a synthetic sample, were electron-microscopically observed by the lattice imaging method along two directions parallel and perpendicular to the fibre axis. The results are as follows: (a) The lattice fringes of 4.5 Å corresponding to 020 were often tilted to the edge of the fibrils with an angular distribution ranging up to about 10° with a peak value at a few degrees, depending on the sample. (b) Most of the fibrils examined were hollow cylinders and their circumferential lattice layers form spiral or multi-spiral layers. The perfectly concentric cylindrical layers were also found with a frequency depending on the sample. (c) Unusual growth patterns which cannot be explained by Jagodzinski and Kunze's model were observed. (d) The lattice images of the cortical fibrils (cone-in-cone shape) were observed in the synthetic sample. (e) Most fibrils greater than about 350 Å in diameter showed traces of discontinuous growth in two or three steps, depending on the growth conditions, and this gave rise to various distributions of the fibril diameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739471001402
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  • 12
    Electronic Resource
    Electronic Resource
    Charging effect on the HRTEM imaging of small MgO crystals
    Amsterdam : Elsevier
    Ultramicroscopy 27 (1989), S. 223-231 
    Details
    ISSN: 0304-3991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3991(89)90015-6
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  • 13
    Electronic Resource
    Electronic Resource
    Contrast simulation of high resolution electron holography on surface structures
    Amsterdam : Elsevier
    Ultramicroscopy 35 (1991), S. 245-253 
    Details
    ISSN: 0304-3991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3991(91)90076-I
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  • 14
    Electronic Resource
    Electronic Resource
    Effects of acidic pH on the formation of vinblastine-induced paracrystals in Chinese hamster ovary cells
    Amsterdam : Elsevier
    Biology of the Cell 82 (1994), S. 51-57 
    Details
    ISSN: 0248-4900
    Keywords: acid pH ; tubulin paracrystals ; vinblastine
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0248-4900(94)90066-3
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  • 15
    Electronic Resource
    Electronic Resource
    Serpentine minerals hydrothermally synthesized and their microstructures
    Amsterdam : Elsevier
    Journal of Crystal Growth 24-25 (1974), S. 627-630 
    Details
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0248(74)90393-5
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  • 16
    Electronic Resource
    Electronic Resource
    Pituitary choristoma composed of corticotrophs and adrenocortical cells in the sella turcica (1996)
    Springer
    Virchows Archiv 427 (1996), S. 613-617 
    Details
    ISSN: 1432-2307
    Keywords: Pituitary gland ; Choristoma ; Corticotroph ; Adrenocortical cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A pituitary tumour composed of well-differentiated corticotrophs and adrenocortical cells is reported. Sections of the tumour revealed a mixture of small round cells with amphophilic or basophilic periodic acid-Schiff (PAS)-positive cytoplasm and large spherical and oval cells with abundant, granular, partly vacuolated PAS-negative cytoplasm. The small cells contained type 1 cytokeratin-positive microfilaments, numerous 250–500 nm endocrine-type secretory granules immunoreactive for adenocorticotropic hormone (ACTH) and β-lipotropin. The large cells possessed ample cytoplasm filled with abundant vesicular smooth endoplasmic reticulum, numerous mitochondria possessing tubulovesicular cristae and frequent dense bodies. They lacked the features of pituitary endocrine cells or folliculostellate cells and were found to contain a panel of steroidogenic dehydrogenases and hydroxylases. The tumour was classified as a choristoma, in which two distinct cells types, corticotrophs and adrenocortical cells, were mixed. We suggest that, under continued ACTH stimulation, uncommitted stem cells may differentiate into adrenocortical cells. Alternatively, the presence of adrenocortical cells may be the result of heterotopia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202893
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  • 17
    Electronic Resource
    Electronic Resource
    Experimental model of chronic tonsillar herniation associated with early stage syringomyelia (1995)
    Springer
    Acta neuropathologica 90 (1995), S. 425-431 
    Details
    ISSN: 1432-0533
    Keywords: Tonsillar herniation ; Syringomyelia ; Chiari malformations ; Histology ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This report describes an experimental model of chronic tonsillar herniation and its effects on the spinal cord. In ten rats, a small piece of chemically induced mammary cancer was transplanted to the supraoccipital bone. In all cases, the transplanted cancers grew into the posterior fossa, destroying the supraoccipital bone and compressing the cerebellum extradurally. In six of the ten rats, tonsillar herniation was observed at 8–14 weeks after transplantation. Transdural infiltration of the tumor cells was not apparent in any animal. In those rats with tonsillar herniation (n=6), the spinal cord from the C5 to the T8 segments showed enlargement of the central canal without exception. Histological examination revealed the following changes: stretching and thinning of the ependymal cells; swelling of the astrocytic processes; and extracellular edema, predominantly in the dorsal gray matter, but also in the ventral inner portion of the dorsal column. In the control group (n=4) and those rats without tonsillar herniation (n=4), such histological changes of the spinal cord were not observed. Although the lesions can not be regarded as representing mature syringomyelia, they most likely constitute an earlier evolutionary stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294801
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  • 18
    Electronic Resource
    Electronic Resource
    Capsular and thalamic infarction caused by tentorial herniation subsequent to head trauma (1991)
    Springer
    Neuroradiology 33 (1991), S. 296-299 
    Details
    ISSN: 1432-1920
    Keywords: Descending transtentorial herniation ; Capsular infarction ; Thalamic infarction ; CT scan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Five patients (4 male and 1 female) were observed to have capsular and thalamic infarction ascribed to descending transtentorial herniation (DTH) caused by head injury. A lucid interval immediately after the trauma and the presence of an epidural hematoma (EDH) characterized all five cases. At the time of hospitalization consciousness was seriously impaired and signs of cerebral herniation were apparent. Two to four days after the trauma, low attenuation in the computed tomography (CT) images pinpointed intracerebral damage in the anterolateral part of the thalamus and in the internal capsule on the same side as that of the EDH in three patients, and in the other two patients bilateral thalamic and capsular damage was noted. The low attenuation implicated the perforating arteries, that is the anterior thalamoperforating and anterior choroidal arteries, suggesting infarcted regions caused by occlusion of these arteries. Findings in the present study suggest that arterial occlusion in closed head injury may result from DTH. Moreover, infarction may be attributed to the delayed effects of injury.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00587809
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  • 19
    Electronic Resource
    Electronic Resource
    Electron-microscopic evidence of transformation-induced lattice defects in grey tin (1973)
    Springer
    Journal of materials science 8 (1973), S. 297-298 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550683
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