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  • 11
    Electronic Resource
    Electronic Resource
    Pseudodirect biexcitons in GaAs/AlAs type-II superlattices (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1629-1633 
    Details
    ISSN: 0392-6737
    Keywords: III–V semiconductors ; Excitons and related phenomena (including electron-hole drops) ; III–V compounds and systems ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We report on the biexciton formation of the pseudodirect exciton consisting of the AlAs-X z electron and the GaAs-Γ heavy hole in (GaAs) m /(AlAs) m type-II superlattices withm=10, 12, and 13 monolayers. The photoluminescence lineshape of the pseudodirect exciton exhibits a doublet feature having an energy separation of ∼3 meV at the excitation power of the order of mW/cm2 in all the samples, and the low-energy band grows superlinearly. The transient profiles of the doublet photoluminescence band early indicate the biexciton formation: the delay of the rise of the biexciton photoluminescence on the low-energy side and its shorter decay time in comparison with the exciton photoluminescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457255
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  • 12
    Electronic Resource
    Electronic Resource
    Inhibition of thiamine transport in baker's yeast by methylene blue (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 1153-1154 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Methylene blue was found to inhibit thiamine transport competitively (Ki=0.63 μM) in baker's yeast. The dye was also effective in abolishing the growth inhibition ofSaccharomyces cerevisiae by pyrithiamine which is known to be taken up by a common transport system for thiamine in yeast cells. A possible mechanism for the inhibition by methylene blue of the thiamine transport system in baker's yeast is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01976094
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  • 13
    Electronic Resource
    Electronic Resource
    Active transport of dimethialium inSaccharomyces cerevisiae (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 385-386 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Dimethialium, a derivative of thiamine which has a methyl group in place of hydroxyethyl group at the 5-position of the thiazole moiety, was found to be accumulated in nonproliferating cells ofSaccharomyces cerevisiae by the same transport mechanism for thiamine. The results strongly support the supposition that thiamine as well as dimethialium can be transported and accumulated without obligatory phosphorylation in yeast cells, since dimethialium is not phosphorylated by yeast thiamine pyrophosphokinase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01975100
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  • 14
    Electronic Resource
    Electronic Resource
    Effect of aloe lectin on deoxyribonucleic acid synthesis in baby hamster kidney cells (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 669-671 
    Details
    ISSN: 1420-9071
    Keywords: Aloe arborescent varnatalensis ; glycoprotein, aloe lectin ; deoxyribonucleic acid synthesis ; baby hamster kidney cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A homogeneous glycoprotein (mol.wt 40,000) containing 34% carbohydrate was isolated fromAloe arborescens var.natalensis. At a concentration of 5 μg/ml, this glycoprotein was shown to stimulate deoxyribonucleic acid (DNA) synthesis in baby hamster kidney (BHK) cells and to have the properties of a lectin which reacts with sheep blood cells. The chemical and physical properties of the glycoprotein (aloe lectin) are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02007712
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  • 15
    Electronic Resource
    Electronic Resource
    Interaction of basic dyes with the thiamine transport system inSaccharomyces cerevisiae (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 473-474 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Basic dyes such as methylene blue and triphenyltetrazolium chloride were found to inhibit thiamine transport inSaccharomyces cerevisiae. Conversely, the reduction of methylene blue and triphenyltetrazolium chloride by yeast cells was inhibited by thiamine. A thiamine transport mutant ofSaccharomyces cerevisiae showed decreased utilization of these dyes. From the results, the possibility that the uptake of basic dyes may proceed via a membrane-bound thiamine-binding protein in the thiamine transport system of the yeast is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01986142
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  • 16
    Electronic Resource
    Electronic Resource
    Effect of lipophilic cations on thiamine transport system in isolated rat hepatocytes (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 1022-1023 
    Details
    ISSN: 1420-9071
    Keywords: Thiamine uptake ; rat hepatocyte ; lipophilic cations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effect of lipophilic cations such as triphenylmethylphosphonium, tetraphenylphosphonium and tetraphenylarsonium in addition to dibenzyldimethylammonium on thiamine transport in isolated rat hepatocytes was studied. Lipophilic cations at the concentration 10 μM almost completely inhibited thiamine uptake. Kinetic studies showed that these compounds were competitive inhibitors with a very high affinity. These results suggest that lipophilic cations in addition to quaternary ammonium compounds also share a common binding site for thiamine in isolated rat hepatocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01940715
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  • 17
    Electronic Resource
    Electronic Resource
    The NF-κB binding site is essential for transcriptional activation of the IL-15 gene (1998)
    Springer
    Immunogenetics 48 (1998), S. 1-7 
    Details
    ISSN: 1432-1211
    Keywords: Key words Interleukin-15 ; Gene transcription ; Macrophage ; NF-κB ; LPS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  We cloned the 5’ upstream region of IL-15 genomic DNA and examined promoter activity in macrophages stimulated with lipopolysaccharide(LPS). The 1.2 kilobase (kb) fragment of the 5’ upstream region contained binding elements for LPS-inducible transcription factors such as NFIL-6 or NF-κB. Determined by luciferase assay following transient transfection in the J774A.1 macrophage cell line, the 1.2 kb of the 5’ upstream region exhibited high promoter activity in response to LPS, while promoter activity was significantly reduced by the 5’ deletion of 313 base pairs containing the NF-κB binding motif. Nuclear protein prepared from LPS-stimulated macrophages formed a complex with the NF-κB binding sequence of the IL-15 promoter. Taken together, the binding of nuclear protein to the NF-κB binding site is required for transcriptional activation of the IL-15 gene in LPS-stimulated macrophages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002510050393
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  • 18
    Electronic Resource
    Electronic Resource
    Quantitative immunohistochemistry of metallothionein in rat placenta (1989)
    Springer
    Histochemistry and cell biology 90 (1989), S. 365-369 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The presence of metallothionein (MT) was demonstrated in placentae from cadmium-exposed and control rats by an immunohistochemical technique, using peroxidase as label and the diaminobenzidine procedure for the staining reaction. The protein was found in different regions of the placenta, i.e. in trophoblastic labyrinth, in spongiotrophoblast and in visceral yolk sac. Cytophotometric analysis of the final reaction product revealed that the amount of MT was increased in the placental labyrinth of cadmium-exposed rats. Increases were found in both nuclei and cytoplasm of trophoblast cells in the labyrinth region. Possible roles of MT in the transport of zinc and in the carbohydrate metabolism are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00508314
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  • 19
    Electronic Resource
    Electronic Resource
    Immunohistochemical localization of metallothionein in the eye of rats (1991)
    Springer
    Histochemistry and cell biology 95 (1991), S. 535-539 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In order to elucidate possible physiological roles of metallothionein (MT), we have studied immunohistological localization of MT in the eye of the rat, using an avidin-biotin peroxidase complex method. As a result, strong MT immunostaining was observed in the epithelium of the lens and cornea. In the retina, considerably strong MT immunostaining was observed in the pigment cell layer while the nerve fiber layer and inner plexiform layer showed weak MT staining. Glial cells in the optic nerve were found to have marked MT staining. The present result is consistent with the hypothesis that MT may be involved not only in activation of zinc enzymes and cell proliferation through supply of zinc ions, but also in a protective mechanism in the blood-retina barrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266738
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  • 20
    Electronic Resource
    Electronic Resource
    Metallothionein mRNA in the testis and prostate of the rat detected by digoxigenin-labeled riboprobe (1994)
    Springer
    Histochemistry and cell biology 101 (1994), S. 341-346 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Metallothionein (MT), a cysteine-rich heavy metal-binding protein, has been considered to play a role in the homeostatic control and detoxification of heavy metals, such as zinc, copper, and cadmium. In the present study, we have utilized a digoxigenin-labeled riboprobe to localize MT mRNA only by bright-field optics in the testis and prostate of the rat. In the rat testis, MT mRNA was found predominantly in primary spermatocytes and also in secondary spermatocytes and spermatids, but not in the spermatogonia, Sertoli cells, and Leydig cells. On the other hand, MT protein was present in these spermatogenic cells as well as in spermatozoa and Sertoli cells. In the prostate, MT mRNA was found predominantly in the epithelium of the dorsolateral lobes, but not in the ventral lobe, which is in agreement with the observed localization of MT protein. The utilization of both in situ hybridization and immunohistochemical staining on the same tissue specimens show MT gene expression in specific cell types in the male genital organs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00268995
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