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  • 1
    Digitale Medien
    Digitale Medien
    Fluorescence extended x-ray absorption fine structure study on local structures around Mn atoms in thin (In, Mn)As layer and (In, Mn)As quantum dots (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 66-70 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have investigated thin (In, Mn)As layer and (In, Mn)As quantum dots (with Mn mole fraction lower than 0.02) on GaAs(001) by fluorescence extended x-ray absorption fine structure (EXAFS) in order to study the local structures formed around the Mn atoms. The EXAFS analysis revealed that in a 10 nm thick (In, Mn)As layer, the In-site substitutional Mn and the NiAs-type MnAs coexisted, while the majority of the Mn atoms were substituted in the In-sites of InAs in (In, Mn)As quantum dots. It is considered that different growth modes for the thin layer and the quantum dots affect the local structures. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1330761
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  • 2
    Digitale Medien
    Digitale Medien
    Lateral inhibition and habituation of the human auditory cortex (2004)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 19 (2004), S. 0 
    Details
    ISSN: 1460-9568
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The goal of this study was to compare the lateral inhibition and the habituation in the human auditory cortex, two important physiological effects during auditory processing that can be reliably measured by means of magnetoencephalography when recording auditory evoked fields. Applying 40-Hz amplitude-modulated stimuli allowed us to record simultaneously the slow transient evoked and the steady-state fields and thus to characterize the lateral inhibition and the habituation effect in primary and non-primary auditory cortical structures. The main finding of the study is that the lateral inhibition effect of non-primary auditory areas as measured on the major component of the slow transient auditory evoked field (N1) is significantly stronger than the corresponding habituation effect. By contrast, this effect was not observed for the 40-Hz steady-state fields, characterizing the activation of the primary auditory cortex in humans. The results might be interpreted as (i) evidence that the inhibition mediated by lateral connections is stronger than the habituation of excitatory neurons in the non-primary auditory cortex and (ii) the processing hierarchy in the human auditory cortex is demonstrated by the different behaviour of lateral inhibition and habituation in primary and non-primary auditory cortical structures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.0953-816X.2004.03296.x
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  • 3
    Digitale Medien
    Digitale Medien
    Rapid healing of intractable diabetic foot ulcers with exposed bones following a novel therapy of exposing bone marrow cells and then grafting epidermal sheets (2004)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 151 (2004), S. 0 
    Details
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background  Diabetic foot ulcers with exposed bones commonly result in amputation.Objectives  To determine whether exposure of bone marrow cells and subsequent grafting of epidermal sheets accelerates healing and reduces the need for amputation.Methods  Thirty-eight patients with chronic wounds caused by diabetes mellitus were enrolled in this study. Epidermal sheets obtained from suction blisters of each patient were grafted on to diabetic foot ulcers without exposed bones (n = 10) and were compared with the standard treatment of local wound care, debridement with a scalpel when indicated, bed rest and parenteral antibiotics (n = 8). In another group of patients, diabetic wounds with exposed bones were treated either with the standard procedure (n = 9) or with a newly developed experimental procedure (n = 11). In that new procedure, the affected bone was initially exposed by debridement with a scalpel, followed by partial excision with a bone scraper until fresh bleeding was observed from the exposed bone. The lesions were then immediately covered with an occlusive dressing, and finally the wound was covered with an epidermal graft of skin harvested from suction blisters. Patients in each group were matched with their counterparts by age, sex, wound size, wound infection and wound duration, to compare the time needed for total skin repair and rates of amputation.Results  Epidermal grafting significantly accelerated the healing of diabetic foot ulcers (P = 0·042) without exposed bones, with site-specific differentiation. The newly developed combination therapy resulted in the healing of all diabetic ulcers with exposed bones without the occurrence of osteomyelitis or the necessity for amputation (P 〈 0·0001).Conclusions  Our study indicates that early aggressive debridement of diabetic foot ulcers with exposed bones down to a bleeding vascularized base and then grafting epidermal sheets significantly improves healing and reduces the rate of amputation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2133.2004.06170.x
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  • 4
    Digitale Medien
    Digitale Medien
    Über die Parallelitätserhöhung der Micelle in natürlicher Cellulose (1939)
    Springer
    Naturwissenschaften 27 (1939), S. 278-279 
    Details
    ISSN: 1432-1904
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft
    Notizen: Zusammenfassung Es wurde röntgenographisch beobachtet, daß durch Erhitzungsbehandlung von gereinigten Ramiefasern, sowie der daraus erhaltenen Natrocellulose I mit Glyzerin bei 250° eine ziemlich deutliche Erhöhung des Orientierungsgrades der Kristallite in den nativen Fasern bewirkt wurde. Ein höchstorientiertes Präparat, welches ein besonders scharfes und deutliches Bild mit starker Annäherung an das Drehkristalldiagramm eines Einkristalls zeigt, wurde aus Natroncellulose durch die erwähnte Behandlung erhalten.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01495547
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  • 5
    Digitale Medien
    Digitale Medien
    Bemerkungen zur Sauterschen Aufnahme von natürlicher Cellulose (1939)
    Springer
    Naturwissenschaften 27 (1939), S. 857-858 
    Details
    ISSN: 1432-1904
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01513758
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  • 6
    Digitale Medien
    Digitale Medien
    Deep Levels in Bulk-ZnSe Grown by Bridgman Method (2001)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 78-79 (Apr. 2001), p. 367-376 
    Details
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/26/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.78-79.367.pdf
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  • 7
    Digitale Medien
    Digitale Medien
    Secretory granules of pituitary adenomas: quantitative study of hormonal antigenicity (2000)
    Springer
    Acta neuropathologica 99 (2000), S. 263-270 
    Details
    ISSN: 1432-0533
    Schlagwort(e): Key words Pituitary adenomas ; Hormonal ¶antigenicity ; Immunoelectron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Ultrastructurally, the antigenicity of major pituitary hormones in secretory granules was quantitatively investigated in five growth hormone (GH)-secreting adenomas, five prolactin (PRL)-secreting adenomas and eight clinically non-functioning (CN-F) adenomas. Sparsely granulated cells with a few or several small secretory granules (60–100 nm) exhibiting little or only weak antigenicity of various biochemically unrelated hormones were commonly observed in CN-F adenomas and occasionally in GH- and PRL-secreting adenomas. GH- or PRL-secreting adenomas consisted of many densely granulated cells with medium-sized (200–250 nm) or large (over 250 nm) secretory granules and a few or several sparsely granulated cells with small secretory granules. The densely granulated cells showed intense GH or PRL antigenicity and slight to moderate antigenicity for other hormones in large secretory granules and little or only weak antigenicity for various hormones including GH or PRL in small secretory granules. Their secretory granules larger than 160 nm or 140 nm significantly exhibited intense GH or PRL antigenicity (Fisher’s exact test; P 〈 0.05 and 〈 0.01, respectively). Two CN-F adenomas showed sparsely and densely granulated cells as well as intermediate cells. The densely granulated cells closely resembled GH-secreting cells. The intermediate cells simultaneously included small and medium-sized or large secretory granules exhibiting little/slight and intense GH-antigenicity, respectively. This study indicates that sparsely granulated cells of different categories showing slight antigenicity for various hormones, antigenically share the same origin, and that their hormonality, single or multiple, may be selectively activated in the developmental course of secretory granules.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00007436
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  • 8
    Digitale Medien
    Digitale Medien
    The nad4L-orf25 gene cluster is conserved and expressed in sugar beet mitochondria (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 214-220 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Key words Nad4L-orf25 linkage ; RNA editing ; Sugar beet ; Mitochondria
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  We have found that a gene coding for NADH dehydrogenase subunit 4L and a presumed gene, orf25, are linked and co-transcribed with each other in sugar beet mitochondria. Ten and twelve C-to-U editing events were observed in the mRNAs of nad4L and orf25, respectively; the amino-acid sequence specified after editing is better-conserved in comparison with the homologues of other organisms. It is interesting to note that the translation initiation codon of nad4L is created by editing. The conservation of the nad4L-orf25 linkage was examined by PCR-amplification of the intergenic region. We obtained successful PCR products from five dicots (spinach, apple, snapdragon, petunia and tobacco) and two monocots (tulip and pineapple), but not in two poaceous plants, rice and maize. The intergenic region, when present, was found to be well-conserved in its sequence, suggesting a monophyletic origin of this linkage. Our result, together with previous reports of Arabidopsis and four poaceous species, favour the argument that the nad4L-orf25 linkage is conserved throughout angiosperms except in the Poaceae.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001220050029
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  • 9
    Digitale Medien
    Digitale Medien
    Untersuchungen über die Umwandlung von Hydratzellulose in natürliche Zellulose, IV (1939)
    Springer
    Colloid & polymer science 88 (1939), S. 62-68 
    Details
    ISSN: 1435-1536
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Zusammenfassung 1. Die Umwandlung von Hydratzellulose in natürliche Zellulose auf dem Umweg über Alkalizellulose (Na-Zell. I, II, K-Zell. I, II und Li-Zell.) als Zwischensubstanzen konnte durch Erhitzungsbehandlung der letzteren mit Glyzerin auf höhere Temperatur (250° C) bewirkt werden, und zwar viel leichter und vollständiger als auf direktem Wege; es genügte dazu eine Erhitzungsdauer von nur 2∼3 Minuten. 2. Der Umwandlungsgrad des Umwandlungsproduktes steigt gemäß der folgenden Reihenfolge der Alkalizellulosen, über die diese Umwandlung durchgeführt wird: Kalizellulose 〈 Natronzellulose 〈 Lithionzellulose. 3. Die Röntgenbilder für die bei niedrigeren Temperaturen (150∼200°C) erhaltenen Präparate sind im allgemeinen unscharf. 4. Es wurde versucht, eine plausible Erklärung für die oben beschriebenen Befunde zu geben.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01518889
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  • 10
    Digitale Medien
    Digitale Medien
    Effect of calcining temperature on the tetragonal-to-monoclinic phase transition characteristics in 2 mol% yittria-doped zirconia ceramics (2000)
    Springer
    Journal of materials science 35 (2000), S. 3053-3057 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Two types of tetragonal-to-monoclinic (t-m) phase transitioncharacteristics were observed in the 2Y-TZP powder samples. In thesample calcined below 1200°C, the t-m phase transitionoccurred below 200°C, and the fraction of the monoclinic phaseincreased sigmoidally. At the beginning of the transition, thefraction of the monoclinic phase increased gradually, and the latticestrain remained unchanged. The abrupt increase in the monoclinicphase accompanying the increase in the lattice strain of thetetragonal phase followed this. Finally, the fraction of themonoclinic phase was saturated, and the lattice strain dropped to0%. The reaction between the adsorbed water and 2Y-TZP was essentialfor the t-m phase transition of 2Y-TZP to occur in air at around roomtemperature. The lattice strain stored in the tetragonal latticeassisted the phase transition. On the other hand, the fraction of themonoclinic phase increased, accompanied by a decrease in the latticestrain in the 1400°C calcined powder. After the fraction ofthe monoclinic phase was almost saturated, the lattice strain droppedto 0%. A gas-solid reaction between the water vapor in air and2Y-TZP and the diffusion of OH− ion into the 2Y-TZP lattice wereessential for this type of t-m phase transition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004803532387
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