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  • 1
    Buch
    Buch
    Digraphs : theory, algorithms and applications (2001)
    London u.a. :Springer,
    Details
    Titel: Digraphs : theory, algorithms and applications
    Autor: Bang-Jensen, J.
    Beteiligte Person(en): Gutin, Gregory
    Verlag: London u.a. :Springer,
    Erscheinungsjahr: 2001
    Seiten: 754 S.
    Serie: Springer monographs in mathematics
    Materialart: Buch
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    Zuse-Institut Berlin get availability status
  • 2
    Digitale Medien
    Digitale Medien
    Numerical and experimental studies of the intrinsic performance of AlInAs/GaInAs heterojunction bipolar transistors (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4426-4430 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: This paper discusses selected design issues important to the operation of high-speed AlInAs/GaInAs heterojunction bipolar transistors (HBTs). Simulation results reveal that velocity overshoot is an important effect in AlInAs/GaInAs HBTs. It is found to first order that the electron average speed through the base and base/collector depletion region is near 5×107 cm/s. Introduction of a built-in electric field in the base region improves the ft. However, the resultant improvement of the cutoff frequency in the AlInAs/GaInAs HBT is not as significant as in the AlGaAs/GaAs HBT because of the already larger electron velocity in the GaInAs base. Compositional grading in the emitter is not suggested in AlInAs/GaInAs HBTs because it degrades the dc and ac characteristics. The effects of a base setback layer at the emitter/base junction on dc current gain and cutoff frequency have also been studied. It is found that both the doping density and the thickness of the setback layer affect the cutoff frequency, and that the setback layer always degrades the intrinsic performance. The intrinsic setback layer has the lowest cutoff frequency while p-doped setback layer has the highest one.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.348369
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  • 3
    Digitale Medien
    Digitale Medien
    Optical properties of InAlGaAs quantum wells: Influence of segregation and band bowing (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 2584-2589 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Knowledge of the quaternary InAlGaAs material system is very limited for the composition range relevant for growth on GaAs substrates. We report on the characterization and modeling of InAlGaAs quantum wells with AlGaAs barriers, grown pseudomorphically on a GaAs substrate with molecular beam epitaxy. The quantum wells are characterized with photoluminescence, and the measured transition energies are modeled taking into account the influence of In segregation on the shape of the well potential. From the modeling we deduce a relation for the low temperature band gap of unstrained Inx(AlyGa1−y)1−xAs, for 0≤x,y≤0.20. The measured linewidths of the luminescence peaks are in agreement with the broadening expected from random alloy fluctuations and well width fluctuations with an effective interface roughness of 1.1 ML. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.371096
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  • 4
    Digitale Medien
    Digitale Medien
    Effect of tension on flap perfusion: Laboratory and clinical findings (2003)
    Malden, USA : Blackwell Science Inc
    Wound repair and regeneration 11 (2003), S. 0 
    Details
    ISSN: 1524-475X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1524-475X.2003.11613.x
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  • 5
    Digitale Medien
    Digitale Medien
    Glandular Replacement Therapy: An Argument for a Combined Surgical Approach in the Treatment of Noninvasive Breast Cancer (1996)
    Oxford, UK : Blackwell Publishing Ltd
    The @breast journal 2 (1996), S. 0 
    Details
    ISSN: 1524-4741
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1524-4741.1996.tb00083.x
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  • 6
    Digitale Medien
    Digitale Medien
    Effects of Mitochondrial Inhibitors on Intraerythrocytic Plasmodium falciparum in In Vitro Cultures (1986)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 33 (1986), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: . Malarial parasites infecting mammalian hosts are considered to be homolactate fermentors at their asexual intraerythrocytic developmental stage; however, existing ultrastructural and biochemical evidence suggest that their acristate mitochondria could be involved in energy metabolism. In the present study, inhibitors of mitochondrial function including compounds which act on NADH and succinate dehydrogenases, electron transport and mitochondrial ATPase, as well as uncouplers, were found to inhibit the growth and propagation of the human parasite Plasmodium falciparum in in vitro cultures at concentrations that specifically affect mitochondrial functions. Direct measurement of parasite protein and nucleic acid synthesis in synchronized cultures showed that throughout the parasite life cycle both processes were inhibited, the latter process being more sensitive. These results strongly suggest that intraerythrocytic malarial parasites require mitochondrial energy production.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.1986.tb05570.x
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  • 7
    Digitale Medien
    Digitale Medien
    The Mitochondrion of Plasmodium falciparum Visualized by Rhodamine 123 Fluorescence (1985)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 32 (1985), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Rhodamine 123 (Rh 123) has been used to probe the functional status of the mitochondrion present within the asexual, intraerythrocytic stages of the malarial parasite Plasmodium falciparum. This cationic fluorescent dye accumulates specifically in negatively charged cellular compartments, such as mitochondria. Using epifluorescence microscopy the development of what appears to be a single mitochondrion has been followed through the intraerythrocytic cycle. Mitochondrial development progresses from a fine thread-like organelle that becomes longer and eventually branched. Each daughter merozoite receives a branch or piece of the parent organelle. Cytoplasmic Rh 123 accumulation was also observed, indicating that there exists a transmembrane potential across the outer plasma and parasitophorous vacuolar membranes of the parasite. The effects of uncouplers (protonophores), ionophores, and inhibitors were examined by monitoring Rh 123 accumulation and retention. Our results demonstrate that the mitochondrion of P. falciparum actively maintains a high transmembrane potential, the function of which is as yet undefined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.1985.tb04041.x
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  • 8
    Digitale Medien
    Digitale Medien
    Effects of xerosis and ageing on epidermal proliferation and differentiation (1997)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 137 (1997), S. 0 
    Details
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The hallmarks of dry skin (xerosis) are scaliness and loss of elasticity. Decreased hydration and a disturbed lipid content of the stratum corneum are also well-known features. The frequency of dry skin increases with ageing. The aim of this study was to examine if these known features of dry skin are related to changes in epidermal proliferation and differentiation. In addition, age-related changes in normal and in dry skin were examined; 62 volunteers were divided by clinical grading and biophysical measurements into groups with young/normal, young/dry, aged/normal and aged/dry skin. Biopsy samples from the lower legs (most severe dryness) were examined by two-dimensional gel electrophoresis and by immunohistochemistry for epidermal proliferation, epidermal keratins and cornified envelope proteins. There was a slight increase in proliferation in both groups with dry skin compared with normal skin of the corresponding age. In aged/normal compared with young/normal skin there was a significant decrease in proliferation. However, epidermal proliferation was the same in aged/dry skin as in young/normal skin. For epidermal differentiation, an age-independent decrease of keratins K1 and K10 and an associated increase in the basal keratins K5 and K14 was detected in dry skin. There was also an age-independent premature expression of the cornified envelope protein involucrin. In contrast, loricrin expression was not influenced by dry skin conditions. In summary, epidermal proliferation was significantly decreased in aged/normal compared with young/normal skin. Dry skin showed significant changes in the epidermal expression of basal and differentiation-related keratins, and a premature expression of involucrin irrespective of age.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2133.1997.18091892.x
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  • 9
    Digitale Medien
    Digitale Medien
    Maximally efficient permanent magnet structures (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1157-1163 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A general theory is developed for determining the most efficient magnetic structure that generates a specified magnetic field. The structure is assumed to be composed of linear, isotropic magnetized material, occupying a given geometrical region. The efficiency is quantified by a figure of merit defined as the external field energy produced by the magnet divided by the maximum amount of energy that can be stored by the magnetized material. A set of equations is derived that determines the distribution of remanence needed to maximize this figure of merit, and several theorems concerning maximally efficient structures are given. Simple two-dimensional examples are used to illustrate the theory. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360914
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  • 10
    Digitale Medien
    Digitale Medien
    Erratum: "Maximally efficient permanent magnet structures'' [J. Appl. Phys. 79, 1157 (1996)] (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 1941-1941 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363831
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