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  • 1
    Digitale Medien
    Digitale Medien
    Si—O bond structure in slow-ion deposited SiO2 films (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3354-3356 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: By impinging a beam of O+2 ions of energy 150 eV〈E〈1 keV on a Si(100) surface, we produced oxide films of varying thickness at room temperature. We find that the Si—O bond features of the films are quite similar to those of a thermally prepared vitreous SiO2 glass. We further observe that an intermediate range order in the form of n-member ring clusters with n=4 and n=6 exists in the resulting films.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.348565
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  • 2
    Digitale Medien
    Digitale Medien
    Ultraviolet Absorption Spectra of 2-Substituted 8-Quinolinols (1951)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 73 (1951), S. 630-632 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja01146a040
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  • 3
    Digitale Medien
    Digitale Medien
    Differential expression of phospholipase D1 in the developing retina (2002)
    Oxford, UK : Blackwell Science, Ltd
    European journal of neuroscience 15 (2002), S. 0 
    Details
    ISSN: 1460-9568
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Expression patterns of phospholipase D1 (PLD1) in the developing rat retina were investigated using immunocytochemistry and Western blot analysis and compared with the expression patterns of glutamine synthetase. PLD1 immunoreactivity appeared first in a few neuroblasts in the middle of the mantle zone of the primitive retina by embryonic (E) day 13. PLD1-immunoreactive primitive ganglion cells were characterized in the ganglion cell layer by E17. Faint immunoreactivity at E17 profiled radially orientated cells and this pattern appeared up to postnatal (P) day 7. In the ganglion cell layer at P3, displaced amacrine cells and ganglion cells were classified. At P5, presumptive horizontal cells and amacrine cells were identified. By P7, a thin outermost layer of newly formed segments of the photoreceptor cells was also PLD1 immunoreactive. PLD1 immunoreactivity at P8 was limited to radial Müller cells and the outer segment layer of the photoreceptor cells, and the expression pattern was conserved to adulthood. Western blot analysis showed relatively high amounts of PLD1 protein at E17 and P3, a decrease at P7, and moderate amounts from P8 onward. Co-expression of PLD1 with glutamine synthetase in the retina appeared first after birth in differentiating neurons and in Müller cells by P8; thereafter the pattern was maintained. The expression pattern of the PLD1 during development of the retina suggests that PLD1 plays important roles in glutamate-associated differentiation of both specific neurons and radial glial cells, and in glutamate-mediated cellular signalling in Müller cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1460-9568.2002.01939.x
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  • 4
    Digitale Medien
    Digitale Medien
    Selective degeneration of two out of the nine types of synapses in cat caudate nucleus after cortical lesions (1978)
    Springer
    Experimental brain research 31 (1978), S. 67-80 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Caudate ; Cat ; 9 Types of synapses ; Degenerated ; Cortico-striate boutons
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In the cat caudate nucleus the same nine types of synapses are found as in putamen and fundus striati. The three parts of the striatum in the strict sense do not differ in the morphological differentiation of synapse types but only in their quantitative distribution. One-third of all synapses in the caudate nucleus are axo-spinous type IV synapses with a curved and divided asymmetric contact. This strongly suggests that the caudate nucleus interneuronal apparatus is dominated by centre-median input, in contrast to the putamen which is controlled by the cortico-striatal input to its internuncial cells and by its strong intrastriatal feedback mechanism. Extensive destruction of the convexity of the cortex and the medial cortex in one hemisphere results in dark degeneration of a large proportion of two of the nine types of caudate synapses: a) the axo-dendritic type VII synapses exciting the large aspiny caudate neurons and b) the axo-spinous type III synapses making contact with the small spiny neurons of the interneuronal cell apparatus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00235805
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  • 5
    Digitale Medien
    Digitale Medien
    Vibrational property of the slow N 2 + ions deposited SiNx films (1994)
    Springer
    Applied physics 59 (1994), S. 445-448 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.14 ; 68.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We have investigated vibrational properties of silicon-nitride films, SiNx (0.3≤×≤1.33), produced by a non-thermal method using high-resolution electron energy loss spectroscopy. The results, based on a continuous random network model assuming a planar XY3 vibrational bond unit, show that the Si-N bonds in the films closely resemble those in typical thermal silicon nitride although nitrogens occupy some metastable binding sites. We estimate force constants of the restoring forces for a Si3N bond unit, which tend to increase gradually with increasing nitrogen content x. In particular, the central force constant k1 for the in-plane stretching mode of silicon atoms varies with x in the range 297≤k≤331 N/M, larger than the theoretical value for a nitrogen atom imbedded in a pure Si crystal.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00331727
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  • 6
    Digitale Medien
    Digitale Medien
    Angle-resolved photoemission study of the Li-induced structures of the Si(001) surface (1995)
    Springer
    Applied physics 60 (1995), S. 35-40 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 73.20 ; 79.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We have investigated dispersion relations of surface bands induced by Li adsorption on the Si(001) surface at room temperature by Angle-Resolved PhotoE-mission Spectroscopy (ARPES). The characteristic spectral changes in the Energy Distribution Curves (EDCs) with increasing Li coverage implicate that Li adatoms occupy on-top sites of the dimer-forming silicon atoms resulting in 0.5 and 1.0 monolayers for the completion of the first two Li-induced ordered (2×2): Li and (2×1): Li phase, respectively. The unique upward dispersions of the surface bands for these Li-induced structures are ascribed to the size effect of a Li adatom. We further discuss a mechanism which might account for the metallie peak found at the early stage of Li adsorption.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01577610
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  • 7
    Digitale Medien
    Digitale Medien
    Angle-resolved photoemission study of the Li-induced structures of the Si(001) surface (1995)
    Springer
    Applied physics 60 (1995), S. 35-40 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS: 73.20; 79.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract. We have investigated dispersion relations of surface bands induced by Li adsorption on the Si(001) surface at room temperature by Angle-Resolved PhotoEmission Spectroscopy (ARPES). The characteristic spectral changes in the Energy Distribution Curves (EDCs) with increasing Li coverage implicate that Li adatoms occupy on-top sites of the dimer-forming silicon atoms resulting in 0.5 and 1.0 monolayers for the completion of the first two Li-induced ordered (2×2):Li and (2×1):Li phase, respectively. The unique upward dispersions of the surface bands for these Li-induced structures are ascribed to the size effect of a Li adatom. We further discuss a mechanism which might account for the metallic peak found at the early stage of Li adsorption.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01577610
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  • 8
    Digitale Medien
    Digitale Medien
    MR findings of hepatic cavernous hemangioma after intraarterial infusion of iodized oil (1994)
    Springer
    Abdominal imaging 19 (1994), S. 507-511 
    Details
    ISSN: 1432-0509
    Schlagwort(e): Liver, diseases-Liver, neoplasms Liver, MR studies ; Magnetic resonance (MR) ; Contrast media, iodized oil
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Magnetic resonance (MR) imaging was performed on five tumors of three patients who had hepatic hemangiomas. Four tumors were given an intraarterial infusion of 3–8 ml of iodized oil, while one tumor was not. MR images were obtained at 2.0 or 0.5 T. A single spin echo sequence with TE of 30 ms and TR of 500 ms and a double echo sequence with TEs of 60 and 150 ms and TR of 2000 ms, were used to produce relatively T1-, T2-weighted, and heavily T2-weighted images, respectively. Follow-up MR imaging was done 1–5 months after infusion of iodized oil. On relatively T1 weighted images, hemangiomas showed iso or hypointensity. On T2-weighted images, all tumors showed hyperintensity. However, on heavily T2-weighted images, tumors with iodized oil showed heterogeneous, slight hyperintensity, while tumors without iodized oil showed characteristic appearance of marked hyperintensity in hemangiomas. In hepatic cavernous hemangiomas with intraarterial infusion of iodized oil, familiarity with this unusual MR intensity of tumors on heavily T2-weighted images is useful to avoid the incorrect diagnosis and to reduce the frequency of inappropriate hepatic resection.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00198251
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  • 9
    Digitale Medien
    Digitale Medien
    Focal hepatic nodules after transcatheter oily chemoembolization; detection with spiral CT versus conventional CT (1996)
    Springer
    Abdominal imaging 21 (1996), S. 33-36 
    Details
    ISSN: 1432-0509
    Schlagwort(e): Key words: Liver〈+〉—〈+〉CT〈+〉—〈+〉Neoplasms〈+〉—〈+〉Diagnosis.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract. Background: The objective of this study was to determine if spiral computed tomography (CT) results in increased rate of detection of focal hepatic nodules containing iodized oil after transcatheter oily chemoembolization when compared with conventional CT. Methods: Spiral CT with single 24-s breath-hold technique was compared with conventional sequential CT in 42 patients with suspected hepatocellular carcinomas. Two sets of CT scans obtained after transcatheter oily chemoembolization were independently reviewed by two radiologists. The slice thickness was 10 mm for both data sets. The number and sizes of focal hepatic nodules containing iodized oil were documented. All 42 patients had at least one hepatic nodule. The lesion size varied from 2 mm to 12 cm. Results: In six of the 42 patients, more hepatic nodules could be identified on spiral CT compared with conventional CT. When scans with spiral CT were used, 107 nodules were detected, whereas 98 nodules were detected with conventional CT. Overall, nine (9%) more nodules were detected with spiral CT (〈+〉p= .002). If lesions larger than 2 cm are excluded, nine (15%) more lesions were detected with spiral CT (〈+〉p= .002). Conclusion: Spiral CT results in increased rate of detection of focal hepatic nodules after transcatheter oily chemoembolization, particularly in lesions smaller than 2 cm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002619900005
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  • 10
    Digitale Medien
    Digitale Medien
    Iodized-oil retention within hepatic hemangioma:characteristics on iodized-oil CT (1996)
    Springer
    Abdominal imaging 21 (1996), S. 420-426 
    Details
    ISSN: 1432-0509
    Schlagwort(e): Key words: Angioma, gastrointestinal tract—Contrast media, fatty acid—Computed tomography.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract. Objective: The purpose of this study was to describe the characteristic computed tomographic (CT) appearance of iodized-oil retention in hepatic hemangioma and to evaluate the duration of the retention of iodized oil on follow-up CT. Methods: Seventeen hepatic hemangiomas of 14 patients were studied with CT performed 1–3 weeks after injection of 2–9 ml of iodized oil (iodized-oil CT) for the characterization of focal hepatic lesions, which needed differential diagnosis with hepatocellular carcinoma in 10 patients, for therapy in two patients, and for chemoembolization therapy of accompanying hepatocellular carcinomas in two. Twelve patients had 1–7 follow-up CT scans within an interval of 1–38 months. Results: In all cases, iodized-oil CT showed iodized-oil retention within the tumor, regardless of tumor size, shape, location, and amount of injected iodized oil. The distribution was incomplete and predominantly peripheral in all cases. Central retention was also seen in seven cases, in which a relatively large amount of iodized oil was injected, but retention of iodized oil in the tumor was incomplete even in two cases in which a large amount of iodized oil was injected to relieve symptoms and in three cases in which prominent uptake of surrounding liver parenchyma was seen. Patterns of retention were predominantly spotty in five, predominantly nodular in four, and mixed in eight patients. Retention materials slowly washed out but persisted for at least 3 months and up to 38 months (mean = 18.1 months), and complete washout was not seen in any cases at follow-up CT. Conclusion: In all cases of hepatic hemangiomas, iodized oil was retained, and retention persisted over several months. Distribution and patterns of retention were characteristically peripheral, spotty, and nodular at iodized-oil CT. Knowledge of the iodized-oil CT appearance of hepatic hemangioma would be helpful to interpret follow-up CT studies of patients who have undergone iodized-oil chemoembolization procedures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002619900096
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