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  • 1
    Digitale Medien
    Digitale Medien
    Binary specification of the embryonic lineage in Caenorhabditis elegans (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 390 (1997), S. 294-298 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] In Caenorhabditis elegans, the early embryo contains five somatic founder cells (known as AB, MS, E, C and D) which give rise to very different lineages. Two simply produce twenty intestinal (E) or muscle (D) cells each, whereas the remainder produce a total of 518 cells which collectively ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/36869
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  • 2
    Digitale Medien
    Digitale Medien
    Hox genes misled by local environments (1997)
    [s.l.] : Nature Publishing Group
    Nature 385 (1997), S. 588-589 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Cowing and Kenyon1 raise an important issue concerning Hox genes by suggesting that these genes may not only be expressed according to position2 but also according to cell lineage. This suggestion is based on two experiments in which the so-called M cell and two hypodermal V6 cells were manipulated ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/385588a0
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  • 3
    Digitale Medien
    Digitale Medien
    Characterization of Putative Polyphosphoinositide Binding Motifs from Phospholipase C.beta.2 (1995)
    s.l. : American Chemical Society
    Biochemistry 34 (1995), S. 5113-5119 
    Details
    ISSN: 1520-4995
    Quelle: ACS Legacy Archives
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/bi00015a023
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  • 4
    Digitale Medien
    Digitale Medien
    Effect of Social Experience on Dopamine-Stimulated Adenylyl Cyclase Activity and G Protein Composition in Chick Forebrain (1999)
    Oxford UK : Blackwell Science Ltd
    Journal of neurochemistry 73 (1999), S. 0 
    Details
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract : The stimulation of adenylyl cyclase (AC) by dopamine was investigated in membrane fractions of the forebrain areas mediorostral neostriatum/hyperstriatum ventrale (MNH) and lobus parolfactorius (LPO) of 8-day-old domestic chicks that had been raised under different social conditions : group A, socially isolated ; group B, imprinted on an acoustic stimulus ; group C, trained but nonimprinted ; and group D, reared in small groups. Only in the brain of the socially experienced groups could cyclic AMP (cAMP) synthesis be stimulated by dopamine, but not in the socially isolated animals (group A). Ligand binding studies of dopamine D1- and D2-type receptors in membrane fractions did not reveal differences between socially experienced and isolated animals. Forskolin stimulation of total AC in MNH and LPO membrane fractions revealed a significantly enhanced AC stimulation in the socially reared but not in the imprinted group compared with isolated controls. Stimulation of AC by the G protein activator guanylylimidodiphosphate was significantly increased in the MNH and the LPO of socially reared chicks compared with isolated control animals. These results suggest that early postnatal social experience modulates the rate of cAMP synthesis and that these lasting changes are not due to changes of dopamine receptors but are related to increased AC activities and to increased sensitivity of Gs protein.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1471-4159.1999.0731293.x
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  • 5
    Digitale Medien
    Digitale Medien
    The effect of polar additives on charge carrier transport in polysilylenes (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 6071-6078 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effect of polar additives is introduced into the theoretical model of charge carrier transport by hopping across disordered rigid polymer matrices. The electrostatic charge carrier–dipole interaction causes a broadening of the energy distribution of transport states which results in a decrease in the charge carrier mobility. The mobility depends on the dipole moment, the molecular dimensions of the additive, and the additive concentration. For geometrically similar additives, the mobility decreases with increasing dipole moment. The theory explains well the observed decrease in the mobility of holes in poly(methyl-phenylsilylene) with increasing concentration of 1-(benzamido)-4-nitronaphthalene. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360547
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  • 6
    Digitale Medien
    Digitale Medien
    Mapping of crystal defects and the minority carrier diffusion length in 6H–SiC using a novel electron beam induced current technique (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 3986-3992 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report on a mapping technique used to correlate the structure of defects with their electrical characteristics in semiconductors. Interesting results that directly and clearly show the influence of micropipes on the minority carrier diffusion length were obtained in both p- and n-type 6H–SiC. The method is based on electron-beam induced current (EBIC) measurements in planar structures. Values of hole diffusion length in defect free regions of n-type 6H–SiC, with a doping concentration of 1.7×1017 cm−3, ranged from 1.46 to 0.68 μm. These values were reduced to below 0.1 μm at the center of large defects. In addition, measurements on p-type 6H–SiC resulted in electron diffusion lengths ranging from 1.42 to 0.8 μm which also showed drastic reductions near defects. Our planar mapping technique measures diffusion lengths along a linescan. This linear map is then overlaid onto the EBIC image, allowing direct visualization of defects and their effect on minority carrier diffusion lengths. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.368578
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  • 7
    Digitale Medien
    Digitale Medien
    High-resolution x-ray analysis of compressively strained 1.55 μm GaInAs/AlGaInAs multiquantum well structures near the critical thickness (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3325-3327 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Compressively strained InP/GaInAs/AlGaInAs multiquantum well (MQW) laser structures with up to 15 QWs designed for 1.55 μm emission wavelength were grown by metalorganic chemical vapor deposition (MOCVD) on p-type InP(001) substrates. Crystallographic and optical properties are studied using double crystal x-ray diffraction and photoluminescence measurements. The rocking curves of the complicated MQW structure can be perfectly modeled using dynamical diffraction theory. The critical thickness observed for strain relaxation upon growth and laser processing is found to be in good agreement with that predicted by Matthews and Blakeslee [J. Cryst. Growth 27, 118 (1974)] taking into account the MQW structure and the cap layer. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.115235
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  • 8
    Digitale Medien
    Digitale Medien
    Analytical theory of terahertz four-wave mixing in semiconductor-laser amplifiers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 2787-2789 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Four-wave mixing in bulk semiconductor-laser amplifiers is investigated for detunings up to 3 THz. Gain dispersion, i.e. the difference of the gain factors for pump, probe and signal waves as well as saturation effects are found to play a significant role in four-wave mixing with large detunings. To properly describe the saturation behavior, it is assumed that both differential gain and carrier density at transparency are different for different waves. Also, the nonlinear susceptibilities associated with different nonlinear effects are characterized by different dependencies on the carrier density. Generally, the carrier densities at the zero points of the nonlinear susceptibilities (if any) and those of the linear gain factors do not coincide. An analytical solution including these issues is given and a comparison with experimental data is presented. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.116607
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  • 9
    Digitale Medien
    Digitale Medien
    German Works Councils, Profits, and Innovation (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Kyklos 49 (1996), S. 0 
    Details
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1467-6435.1996.tb02074.x
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  • 10
    Digitale Medien
    Digitale Medien
    Role of the Dorso—Caudal Neostriatum in Filial Imprinting of the Domestic Chick: a Pharmacological and Autoradiographical Approach Focused on the Involvement of NMDA-Receptors (1997)
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 9 (1997), S. 0 
    Details
    ISSN: 1460-9568
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Newly hatched domestic chicks were either acoustically imprinted on 400 Hz tone pulses or visually imprinted on a rotating red light. Compared to naive control animals, both groups of imprinted chicks expressed significantly enhanced stimulus evoked 2-fluoro-2-deoxyglucose (2-FDG) uptake in circumscribed areas of the dorso-caudal neostriatum (Ndc). This enhanced excitability after imprinting seems not to be related to changes of NMDA-receptor densities as measured by quantitative receptor autoradiography. However, pharmacological blockade of NMDA-receptors in the dorso-caudal neostriatum leads to a marked suppression of stimulus-evoked 2-FDG uptake in the dorso-caudal neostriatum and also in the interconnected imprinting relevant forebrain area, medio-rostral neostriatum/hyperstriatum ventrale (MNH). Furthermore, chicks which received bilateral Ndc injections of the competitive NMDA antagonist DL-2-amino-5-phosphono valeric acid (APV) during the imprinting experiments showed a dose-dependent decrease of imprinting success compared to vehicle-injected controls. These results indicate that the dorso-caudal neostriatum may represent a polysensory associative brain region in which visual and acoustic features of imprinting objects may be integrated. The activation in this area evoked by the imprinting stimulus during and after imprinting is critically dependent on NMDA-receptor activation, which appears to be required for this learning process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-9568.1997.tb01481.x
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