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  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructural changes in chick cerebellum induced by vitamin E deficiency (1973)
    Springer
    Acta neuropathologica 25 (1973), S. 149-160 
    Details
    ISSN: 1432-0533
    Keywords: Nutritional Encephalopathy ; Brain Edema ; Vitamin E Deficiency ; Electron Microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Focal lesions were induced in the cerebellum by feeding chickens a diet high in unsaturated fats and deficient in vitamin E. Ultrastructurally, the lesions consisted of central and peripheral zones. The central zone was characterized in the cortex and white matter by enlargement of the intercellular space, swelling of astrocytes, vacuolization of oligodendrocytes, ballooning of nerve fibers, degenerative changes in small blood vessels, and extravasation of plasma and blood cells. The peripheral zone was characterized by enlargement of the intercellular space in the white matter, swelling of astrocytes in the cortex, and the accumulation of dark bodies in the endothelium of small blood vessels. The results suggest that this nutritional encephalopathy is caused by alterations in the permeability of the vascular bed due to the dietary stress of unsaturated fatty acids in the absence of vitamin E.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687559
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  • 2
    Electronic Resource
    Electronic Resource
    The stability of the copper-iron sulphides (1967)
    Springer
    Mineralium deposita 2 (1967), S. 250-250 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00201922
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of degenerating cerebellothalamic terminals in the ventral medial nucleus of the cat (1980)
    Springer
    Experimental brain research 38 (1980), S. 125-135 
    Details
    ISSN: 1432-1106
    Keywords: Ventromedial thalamic nucleus ; Cerebellar degenerating boutons ; Ultrastructure ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Terminal degeneration of cerebellar afferents in the ventral medial thalamic nucleus (VM) was studied in cats at the ultrastructural level after uni- or bilateral lesions in the brachium conjunctivum (BC). To achieve discrete lesions within the BC, a new very accurate stereotaxic technique was used. Numerous large terminals belonging to a population of so-called LR boutons were observed degenerating in the VM. The boutons displayed a wide variety of degenerative changes. Some revealed the features of the classical neurofilamentous type of degeneration. Others, although containing a slightly increased number of neurofilaments, featured much more prominently large numbers of coated vesicle shells and heavy accumulations of a flocculent electrondense material. Degeneration in a third group of boutons similar to some extent to the light type of degeneration was characterized by tight clumping of enormously swollen or distorted synaptic vesicles within a light matrix. At later stages, however, all these boutons were believed to become shrunken and electron-dense since intermediate stages between the light- and dark-appearing boutons were observed. The degenerating cerebellar boutons formed asymmetrical synaptic contacts. Groups of 3 or 4 boutons terminated upon dendrites of projection neurons synapsing more frequently on spines than on dendritic stems. The synaptic contacts between cerebellar boutons and the vesicle-containing dendrites of local circuit neurons were encountered as often if not more than the contacts on projection neuron dendrites. Triads consisting of cerebellar boutons and dendrites of both types of neurons were observed very regularly. This synaptic arrangement provides the anatomical basis for the modification of cerebellar input in the VM by interneurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236734
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  • 4
    Electronic Resource
    Electronic Resource
    Nigrothalamic pathway in the cat demonstrated by autoradiography and electron microscopy (1978)
    Springer
    Experimental brain research 33 (1978), S. 481-492 
    Details
    ISSN: 1432-1106
    Keywords: Nigrothalamic projections ; Autoradiography ; Electron microscopy ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Light microscopic autoradiography and electron microscopy were used to trace the nigrothalamic projections and to study the sites of termination of this pathway in the cat. Injections of tritiated amino acids or electrolytic lesions were placed in the substantia nigra pars reticularis (SNr). An accumulation of radioactivity was found in the ventral medial nucleus and in the ventromedial part of the ventral anterior nucleus. At the ultrastructural level degenerating medium size synaptic boutons and medium size myelinated fibers were observed in these nuclei. The boutons contained clear pleomorphic vesicles and formed symmetrical type synaptic contacts with regular type dendrites and vesicle-containing dendrites. The present findings indicate that the ventral medial nucleus is the principal site of termination of nigrothalamic projections in the cat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235569
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  • 5
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. III. Photodissociation and photodesorption of CH3Br adsorbed on LiF(001) (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1475-1497 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Submonolayers of CH3Br physisorbed on a LiF(001) surface were irradiated by pulsed ultraviolet (UV) in ultrahigh vacuum in a study of surface aligned photochemistry (SAP). Translational energy and angular distributions were obtained for both photofragments and photodesorbed molecules by angularly resolved time of flight to a mass spectrometer. Single-photon adsorbate photolysis (PDIS) led to photofragment distributions, CH3 and Br, which differed from gas-phase photolysis. Photodesorption (PDES) of CH3Br was nonthermal and arose from UV absorption by the LiF crystal. The dynamics for these photoprocesses were found to vary in an informative way with the coverage and the phase of the adsorbed layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455148
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  • 6
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. IV. Photodissociation, photoreaction, photoejection, and photodesorption of H2S on LiF(001) (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1498-1523 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The UV surface-aligned photochemistry (SAP) of submonolayers of H2S physisorbed on LiF(001) has been examined. Translational energy and angular distributions for photodissociation products and for H2S molecules leaving the surface after pulsed laser irradiation at 193 and 222 nm were measured by angularly resolved TOF to a quadrupole mass spectrometer. Single photon surface-aligned photodissociation (PDIS) of adsorbed H2S produced H with structured translational energy distributions P(ET) indicative of vibrational excitation within the complementary SH fragments. The SH vibrational distribution was bimodal and varied markedly with H2S coverage. Photoreaction (PRXN) within the adsorbate layer occurred as the H2S coverage increased beyond ∼0.1 monolayer. Molecular hydrogen was produced by PRXN of H with adjacent H2S(ad) molecules. The product H2 translational energy distribution showed evidence of both direct and indirect PRXN dynamics. At coverages greater than one monolayer, photoejection (PEJ) of H2S molecules with translational energies up to several eV was observed; PEJ was thought to be due to interadsorbate quenching of electronically excited H2S. At all the coverages examined, absorption of UV by the LiF substrate was found to photodesorb (PDES) H2S molecules with low translational energies (0–0.5 eV). The PDES was ascribed to an acoustic wave produced by laser excitation of color centers in the LiF, which were seen to fluoresce.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455716
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  • 7
    Electronic Resource
    Electronic Resource
    Surface-enhanced photodissociation: UV photolysis of OCS on LiF(001) (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 4092-4093 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453811
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  • 8
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. V. Ultraviolet photodissociation of OCS on LiF(001) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3645-3658 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Dynamical studies of the UV photochemistry of submonolayer coverages of OCS physisorbed on 116 K LiF(001) are presented. Following pulsed ultraviolet laser irradiation (λ 222 nm), translational energy and angular distributions were obtained for photolysis products by angle-resolved time-of-flight mass spectrometry. Photolysis of adsorbates gave rise to distributions which differed markedly from gas phase photodissociation. Energetic sulphur and CO fragments were detected for coverages ≥10−5 monolayers. The cross section for photolysis in the adsorbed state was enhanced 103–104× relative to the gas phase. The dynamics for these photoprocesses were found to vary with adsorbate coverage, indicative of a catalytic influence of the surface on the photochemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458795
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  • 9
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. VI. Ultraviolet photoreaction of OCS on LiF(001) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3659-3672 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The surface-aligned photoreaction (PRXN) of OCS physisorbed on LiF(001) was investigated at 222 nm. Ultraviolet PRXN within the adsorbate was detected over a wide range of coverages. Diatomic sulphur was produced by reaction of photolytically generated sulphur atoms with a coadsorbed OCS molecule: S*, S+OCS(ad)→S*2, S2(g)+CO(ad/g). Translational energy and angular distributions of the S2 reaction product were obtained by angle-resolved time-of-flight mass spectrometry. The dynamics of PRXN were found to vary with adsorbate coverage. At low coverages (〈10−2 ML), reaction was attributed to a "direct'' abstraction mechanism, leading to energetic S2. As the coverage was increased above 10−2 ML, both "direct'' and "indirect'' PRXN dynamics were observed. Possible origins of these differing photoreaction dynamics are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458796
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  • 10
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. VII. Ultraviolet photoejection and photodesorption of OCS on LiF(001) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3673-3684 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The UV photoejection and photodesorption of OCS on LiF(001) at 222 nm are reported. Translational energy and angular distributions were obtained by angle-resolved TOF mass spectrometry. Energetic photoejection (PEJ) product, characterized by a peak translational energy T'p∼0.3 eV, was detected for (approximately-greater-than)0.5 ML coverages of OCS(ad). The PEJ angular distribution was sharply peaked around the surface normal, ∼cos 18θ. The initial absorption of energy was into the chromophore of an OCS molecule. Molecular photodesorption (PDES) product, characterized by low translational energy, was detected for coverages ≥10−2 ML. The translational energy distribution P(T') was found to be a sensitive function of detection angle, adsorbate coverage and laser energy. Peak translational energies and FWHM's were ∼0.05 and ∼0.20 eV, respectively. Angular distributions were also sensitive to coverage, narrowing from ∼cos θ to cos 11θ with increasing coverage. Photodesorption is thought to involve absorption of radiation by defect centers in the LiF(001), with conversion of the absorbed energy into phonons which, following propagation to the surface, induce desorption of OCS(ad).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458797
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