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  • 1
    Electronic Resource
    Electronic Resource
    Helicoidal distributed-feedback cavity action in a ferroelectric liquid crystal (1995)
    Springer
    Applied physics 60 (1995), S. 485-487 
    Details
    ISSN: 1432-0649
    Keywords: 42.80. Jr ; 78.20. Wc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Second-Harmonic (SH) generation was observed in homeotropically aligned ferroelectric liquid-crystal cells using fundamental light propagating along the helicoidal axis. Relatively strong SH light was observed in the helicoidal structure when the optical pitch was nearly the same as the SH-light wavelength, though, otherwise, the cancellation of the generated SH light by the helicoid results in negligibly weak SH intensity. Because the observed SH light is independent of the cell thickness, the SH light is attributed to the one generated from the surface region and the SH light generated inside the cell is confined and lost by the helicoid. This phenomenon indicates the helicoidal Distributed-FeedBack (DFB) cavity action and suggests the possibility of the helicoidal DFB laser using dye-doped ferroelectric liquid-crystal cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081331
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  • 2
    Electronic Resource
    Electronic Resource
    The caste system of the dolichoderine antTechnomyrmex albipes (Hymenoptera: Formicidae): morphological description of queens, workers and reproductively active intercastes (1991)
    Springer
    Insectes sociaux 38 (1991), S. 413-422 
    Details
    ISSN: 1420-9098
    Keywords: Castes ; reproductive intercastes ; supplementary reproductives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Females ofTechnomyrmex albipes consist of winged queens, intercastes and workers. In established colonies, reproduction is performed by many intercastes (wingless females which have intermediate phenotypes between queen and worker characters). Dissection and morphological examination revealed that intercastes had a spermatheca, but workers did not. Intercastes can be divided into three classes: major intercastes with three ocelli, medium intercastes with one ocellus, and minor intercases without ocelli. Workers have no ocelli. The thoracic structure of intercastes gradually becomes more complex from minors to majors. The body size of intercastes gradually increases from minors to majors, and so does the number of overioles. The body size distributions of minor intercastes and workers overlap considerably, but the distributions of ovariole numbers overlap less. Winged queens had distinctly larger body sizes, more ovarioles and larger spermathecae than intercastes. Most intercastes were inseminated with developed ovaries and appeared to reproduce. The caste system and reproductive division of labour inT. albipes is compared to those of ant species in which permanently wingless females reproduce.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01241875
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  • 3
    Electronic Resource
    Electronic Resource
    Green- and blue-light-mediated chloroplast migration in the centric diatomPleurosira laevis (1998)
    Springer
    Protoplasma 203 (1998), S. 214-220 
    Details
    ISSN: 1615-6102
    Keywords: Blue light ; Chloroplast orientation ; Diatom ; Green light ; Light fluence rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The existence of two photoreceptors regulating chloroplast orientation was found in the centric diatomPleurosira laevis. Chloroplasts migrate through the transvacuolar cytoplasmic strands according to the light conditions. Weak white light of less than 46 μmol/m2 · s (10 W/m2) induces chloroplast movement to the cortical cytoplasm, which is located next to the plasma membrane (dispersion), while intense white light of more than 92 μmol/m2 · s (20 W/m2) induces chloroplast movement towards the nucleus, which is situated in the center of the cell (assemblage). Chloroplast dispersion was maintained as long as the cells were irradiated with weak white light. Conversely, chloroplast assemblage under intense white light was transient and the chloroplasts were released from assemblage after 15 min. Action spectra determined with the Okazaki Large Spectrograph revealed that the weak white light receptor and the intense white light receptor are characterized by 540 nm and 450 nm optima, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279479
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  • 4
    Electronic Resource
    Electronic Resource
    Inhibition of wilting and autocatalytic ethylene production in cut carnation flowers by cis-propenylphosphonic acid (1992)
    Springer
    Plant growth regulation 11 (1992), S. 405-409 
    Details
    ISSN: 1573-5087
    Keywords: Ethylene ; carnation (Dianthus caryophyllus) ; ethylene production ; wilting ; propenylphosphonic acid ; longevity ; senescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of cis-propenylphosphonic acid (PPOH), a structural analoge of ethylene, on flower wilting and ethylene production was investigated using cut carnation flowers which are very sensitive to ethylene. Wilting (petal in-rolling) of the flowers was delayed by continuously immersing the stems in a 5–20 mM PPOH solution. In addition, the continuous treatment with PPOH markedly reduced autocatalytic ethylene production of the petals accompanying senescence. This reduction of autocatalytic ethylene production was considered responsible for the inhibitory effect of PPOH on flower wilting. The inhibitory activity of trans-propenylphosphonic acid (trans-PPOH), on both flower wilting and the autocatalytic ethylene production accompanying senescence was markedly lower than that of PPOH, suggesting that PPOH action is stereoselective. PPOH may be of interest as a new, water-soluble inhibitor of wilting and autocatalytic ethylene production in cut carnation flowers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00130649
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  • 5
    Electronic Resource
    Electronic Resource
    Raman spectroscopic investigation of the structure and crystallization of binary alkali germanate glasses (1980)
    Springer
    Journal of materials science 15 (1980), S. 1648-1662 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Raman spectra have been measured on bulk GeO2 glass and the alkali germanate glasses of composition M2OxGeO2 where M=K, Na, Li, and x varies from 19 to 1, as well as on crystallized glasses. The low alkali content glasses (x≥3) retain a completely polymerized structure of germania polyhedra. Addition of small amounts of alkali oxide to GeO2 glass does not break the Ge-O-Ge bridging bonds and creates higher co-ordination of germanium atoms. Further addition of alkali oxide eventually breaks up some of the Ge-O-Ge bonds to create Ge-O− non-bridging oxygens. In the K- and Na-glasses a small number of non-bridging oxygens already exist at x=4.5, while in the Li-glasses they do not exist even at x=4. The structures of the low alkali content glasses start to disappear at x between 4 and 3 and they disappear almost completely at x=2. At x between 2 and 1, glass structures become analogous to the silicate glass structures. At x=2, the glass consists of disordered (Ge2O5) n sheet-like structures and at x=1 disordered (GeO3) n chain structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550581
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  • 6
    Electronic Resource
    Electronic Resource
    The structure of lead silicate glasses determined by vibrational spectroscopy (1978)
    Springer
    Journal of materials science 13 (1978), S. 268-282 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The polarized Raman spectra and infrared powder absorption spectra for PbO ·xSiO2 glasses, with 0.5⩽x⩽2, were measured and interpreted in terms of the structure of the glasses. Comparison of the spectra of the glasses with the spectra of numerous stable and metastable crystalline phases was also made. It was found that the glasses are composed of a number of silicate species. In glasses for whichx is less than 1, the presence of ionic oxygen (oxygen not bonded to silicon) is confidently inferred from the spectra. A new way of deconvoluting the spectra is also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647770
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  • 7
    Electronic Resource
    Electronic Resource
    Body surface potential mapping system equipped with a microprocessor for the dynamic observation of potential patterns (1983)
    Springer
    Medical & biological engineering & computing 21 (1983), S. 83-90 
    Details
    ISSN: 1741-0444
    Keywords: E.C.G. ; Microprocessors ; Surface potential mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A body surface potential mapping system equipped with a microprocessor has been developed. It enables high-speed real-time and simultaneous observation of e.c.g. data of 96 lead points in a character display mode. The machine has functions not only to perform basic data processing such as baseline correction and linear interpolation for malfunctioned electrodes but also to generate an isopotential contour map, record data onto a floppy disc, make hard copies of displayed patterns and characters, etc. To increase the operation speed, all the assembler programs were put in one module. Thus, an operator can easily recognise the spatial motion pattern of the body surface potential map and, in addition, find malfunctioned channels by observing the pattern. A belt type electrode system allows quick and adaptable attachment. The practical usefulness of the system has been proved with the co-operation of cardiologists with over 120 cases of cardiac disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02446410
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  • 8
    Electronic Resource
    Electronic Resource
    Cloning and characterization of the human UDP-N-acetylglucosamine: α-1,3-D-mannoside β-1,4-N-acetylglucosaminyltransferase IV-homologue (hGnT-IV-H) gene (1999)
    Springer
    Journal of human genetics 44 (1999), S. 397-401 
    Details
    ISSN: 1435-232X
    Keywords: Key words N-acetylglucosaminyltransferase ; Fetal brain ; Adult brain ; Heart ; Testis ; Chromosomal band 12q21
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A novel human gene determining a polypeptide product of 478 residues with an estimated molecular mass of 55 kDa, which has significant homology and structural similarity to Bos UDP-N-acetylglucosamine: α-1,3-D-mannoside β-1,4-N-acetylglucosaminyltransferase (GnT-IV), was cloned from the commonly deleted region in pancreatic cancer at 12q21. The gene is composed of at least six exons, and the last three exons cover the open reading frame. Different sized transcripts, 3.8-kb in the heart, brain, and fetal brain and 2.8-kb and 1.7-kb in the testis were observed by Northern blot analysis. By reverse transcription-polymerase chain reaction, expression was also observed in the adult brain, liver, and adrenal gland, but not in pancreas. Because of its significant homology and structural similarity to Bos GnT-IV, it is potentially the gene encoding human GnT-IV or its homologue, which had been one of two genes remaining to be cloned in the human GnT family.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100380050186
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  • 9
    Electronic Resource
    Electronic Resource
    p24/ING1-ALT1 and p47/ING1-ALT2, distinct alternative transcripts of p33/ING1 (2000)
    Springer
    Journal of human genetics 45 (2000), S. 177-181 
    Details
    ISSN: 1435-232X
    Keywords: Key words ING1 ; p33 ; Alternative splicing ; p24/ING1-ALT1 ; p47/ING1-ALT2 ; Chromosome band 13q34
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract p33/ING1s (the growth inhibitor ING1 and candidate tumor suppressor ING1) are key players in the suppressive pathways for human tumorigenesis. We analyzed their complete transcripts, primary structures, and expression. The results led us to discover two novel and related alternatively spliced transcripts encoding p24/ING1-ALT1 and p47/ING1-ALT2. They share C-terminal residues with the candidate tumor suppressors p33/ING1. The candidate tumor suppressors p33/ING1 and p24/ING1-ALT1 were coexpressed in a variety of fetal and adult human tissues, but p47/ING1-ALT2 was minimally expressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100380050206
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  • 10
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    Specific interaction of the CD45 protein-tyrosine phosphatase with tyrosine-phosphorylated CD3 zeta chain. (1994)
    National Academy of Sciences
    Details
    Publication Date: 1994-11-08
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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