Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 11
    Electronic Resource
    Electronic Resource
    Raman studies of the growth mechanism of ZnSe/GaAs(001) heterostructures (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3916-3920 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Monocrystalline ZnSe/GaAs(001) heterostructures have been grown by atomic layer epitaxy with typical thicknesses up to 200 nm. The 1LO Raman spectrum of ZnSe and GaAs, respectively, was recorded in situ during growth interruptions. The spectra were analyzed with respect to Raman intensity, phonon frequency, and bandwidth. Two different growth modes are distinguishable: (i) The biaxial compressive strain in the epilayers is increased in the thickness range up to 40 nm due to lattice mismatch of the heterosystem. This can be interpreted as a transition from an initial 3D island to the 2D layer by layer growth. (ii) When larger thicknesses (40–170 nm) are reached the strain is constant and the 1LO Raman intensity from the epilayer and from the substrate oscillates significantly with thickness. These periodic oscillations are quantitatively described in the framework of interference-enhanced Raman scattering and verify the 2D growth mode in this thickness range. The crystalline quality and the final thickness of the samples were determined by transmission electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354490
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    High mobility n-type charge carriers in large single crystals of anatase (TiO2) (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 633-635 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Resistivity, thermopower, and Hall-effect measurements on large single crystals of the anatase form of TiO2 all indicate high mobility n-type carriers that are produced by thermal excitation from a density of ∼1018 cm−3 putatively present shallow donor states. The decrease of the mobility with increasing temperature is consistent with the scattering of carriers by the optical phonons of TiO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355801
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    facet.materialart.
    Unknown
    Pfeiffer, M.: Elements of Kurux historical Phonology (Book Review) (1977)
    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 72:5 (1977:Sept./Okt.) 520 
    Details
    ISSN: 0030-5383
    Topics: Linguistics and Literary Studies , Ethnic Sciences , History
    Notes: Besprechungen
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4148-1977-072-05-000024
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    facet.materialart.
    Unknown
    Burrow, T., and S. Bhattacharya: The Pengo Language (Book Review) (1975)
    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 70:4 (1975:Juli/Aug.) 403 
    Details
    ISSN: 0030-5383
    Topics: Linguistics and Literary Studies , Ethnic Sciences , History
    Notes: Besprechungen
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4148-1975-070-04-000004
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Small-angle X-ray studies of the scaffold in bacteriophage λ head formation (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 496-497 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The pathway of bacteriophage λ head formation has been well characterized in vivo and in vitro (Hohn, Katsura & Hohn, 1977). First a petit λ particle consisting of a shell protein pE, a protein pNu3 and minor proteins, but lacking DNA, is formed. The pNu3-containing structure is then converted to a structure which does not contain pNu3, and which is capable of taking up and cutting the viral DNA. The purpose of this work is to determine the scaffold structure, formed by pNu3, by small-angle scattering techniques based on the known physico-chemical properties of pNu3-containing and pNu3-lacking particles (Künzler & Hohn, 1978). The scaffold is found to be inside the protein shell but less concentrated than the 130 Å radius core reported from electron micrographs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889878013710
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Influence of misoriented substrates and dislocations on the diffraction patterns of superlattices (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 26 (1993), S. 532-538 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The structures of superlattices on misoriented (001) substrates are described by means of two modified models. From both models, it can be concluded that there is an intensity distribution rod in the reciprocal space perpendicular to the surface and the symmetry of the diffraction pattern is reduced from tetragonal to monoclinic. However, in the first model the diffraction pattern near the substrate reflections and in the second model that near the so-called `average lattice' reflections remains tetragonal. Neglection of both of these facts can cause systematic errors in the determination of the lattice parameters of superlattices. These errors are estimated. Additionally, 60° misfit dislocations are discussed as a reason for the tilt of the layer system with respect to the substrate. The validity of the theoretical predictions was proved by X-ray diffraction studies on symmetric and asymmetric reflections on three GaAs/Ga1 − xInxAs superlattices grown on (001) GaAs. The first sample has a large misorientation and the diffraction behaviour corresponds to the above-mentioned models. The second sample shows a diffraction pattern that can be explained by a tilt of the layer system in relation to the substrate. The third sample has a large misorientation and a large tilt of the layer system and so its diffraction pattern shows an overlap of both effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889893000305
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    facet.materialart.
    Unknown
    Rabotschaja kniga soziologa. Redkollegija: G. W. Ossipow (otwetstwenny redaktor) (Book Review) (1977)
    Berlin : Periodicals Archive Online (PAO)
    Deutsche Zeitschrift für Philosophie. 25:10 (1977) 1290 
    Details
    ISSN: 0012-1045
    Topics: Philosophy
    Description / Table of Contents: REZENSIONEN
    Notes: Zum 60. Jahrestag der Grossen Sozialistischen Oktoberrevolution
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4085-1977-025-10-000020
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Lichtmikroskopische befunde zur neubildung elastischer fasern im basaliomstroma (1975)
    Springer
    Archives of dermatological research 252 (1975), S. 119-130 
    Details
    ISSN: 1432-069X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An einem auslesefreien Material von 275 Basaliomexcidaten wurde die Neubildung elastischer Fasern im Basaliomstroma mit Hilfe der Elastica-Färbungen (Orcein, Resorcin-Fuchsin) histologisch untersucht. In nahezu einem Drittel der Basaliome konnten neugebildete elastische Fasern im Stroma beobachtet werden. An Stellen, an denen eine Neubildung elastischer Fasern nachweisbar war, fanden sich ungewöhnlich zahlreich Fibroblasten und Mastzellen (Toluidin-Blaufärbung). Offensichtlich kommt es unter dem Einfluß des auswachsenden Basaliomstranges im Sinne einer dermo-epidermalen Interaktion 1. zu Mastzellvermehrung 2. zur Fibroblastenstimulierung 3. zur Neubildung elastischer Fasern. Die Beobachtungen legen den Schluß nahe, daß zwischen den genannten Befunden eine Wechselwirkung besteht. Als Folge der dermo-epidermalen Interaktion können die Fibroblasten (auch der Altershaut!) im Basaliomstroma so weit stimuliert werden, daß sie erneut die Fähigkeit erlangen, elastische Fasern zu bilden — eine Funktion, die sonst üblicherweise mit zunehmendem Alter weitgehend eingeschränkt ist. Die Befunde scheinen von Bedeutung unter dem Aspekt der “Verjüngung” menschlicher Altershaut — sie sind bisher jedoch nur von rein theoretischem Interesse.
    Notes: Summary From 275 specimens of all sorts of basal cell epitheliomas the new formation of elastic fibers was histologically investigated by means of selective elastic tissue stains such as orcein and resorcinfuchsin. In nearly one third of the basal cell epitheliomas newly formed elastic fibers could be observed in the stroma. In places where a new formation of elastic fibers was demonstrated fibroblasts and mast cells (toluidine blue stain) were unusually numerous. Apparently the influence of the growing tumor masses of basal cell epitheliomas leads to a dermo-epidermal interaction in the form of 1. increase of mast cells 2. stimulation of fibroblasts 3. new formation of elastic fibers. The observation suggest that there exists a relationship between the above noted findings. Due to the dermo-epithelial interaction (even in senile skin) in the stroma of basal cell epithelioma fibroblasts can be stimulated to such a degree that they regain the ability to produce elastic fibers—a function which usually is greatly diminished with increasing age. The findings seem to be important from the view point of rejuvenation of aging human skin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00561834
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    Characterization of a new repetitive sequence that is enriched on microchromosomes of turkey (1992)
    Springer
    Chromosoma 102 (1992), S. 9-14 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We cloned and characterized a new highly repetitive, species-specific DNA sequence from turkey (Meleagris gallopavo). This repeat family, which accounts for approximately 5% of the turkey genome, consists of a 41 bp repeated element that is present in tandem arrays longer than 23 kb. In situ hybridization to turkey metaphase chromosomes (2n=80) demonstrated that this sequence was located primarily on certain microchromosomes: approximately one-third of the 66 microchromosomes showed a positive signal. With respect to the macrochromosomes, hybridization was seen only in a pericentric position on nos. 2 and 3. The turkey microchromosome (TM) sequence shares motifs (alternating A3–5 and T3–5 clusters separated by 6–8 bp) that have been found previously in other avian tandemly repeated elements, e.g. a chicken microchromosome sequence, and W (female) chromosome-specific sequences of chicken and turkey. However, the TM sequence does not cross-hybridize under moderately stringent conditions with these other sequence. The spread and amplification of related repetitive sequence elements on microchromosomes and W chromosomes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352284
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    A 41–42 bp tandemly repeated sequence isolated from nuclear envelopes of chicken erythrocytes is located predominantly on microchromosomes (1990)
    Springer
    Chromosoma 99 (1990), S. 131-137 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract To study whether specific DNA sequences are associated with nuclear membranes, residual DNA was extracted from DNase-treated nuclear envelopes prepared from erythrocytes of adult chickens (Gallus domesticus). This DNA was then blunt-end ligated into a bacterial plasmid vector. DNA blot analysis and nucleotide sequence determination revealed that approximately 30% of the cloned fragments consisted of different multiples of a 41–42 bp tandemly repeated, partially symmetrical sequence. In situ hybridization to chicken chromosomes demonstrated that the sequence was located primarily on microchromosomes, although some hybridization was also observed to macrochromosomes 7 and 8. Digestion of chicken DNA with any of a number of restriction enzymes did not completely reduce the intensity of a high molecular weight band to which the repeated sequence hybridized. These results, along with those obtained from in situ hybridization, suggested that many copies of this sequence are organized into large tandem arrays, and are not dispersed in many shorter repetitive blocks throughout the chicken genome. Although the repetitive sequence constituted approximately 10% of the chicken genome, it did not hybridize to quail or turkey DNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01735329
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...