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  • Polymer and Materials Science  (9)
  • Phototaxis  (3)
  • 1,2-dimethyl-6,7-dihydroxyisoquinolinium ion  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Diversion of the sign of phototaxis in a Chlamydomonas reinhardtii mutant incorporated with retinal and its analogs
    Amsterdam : Elsevier
    FEBS Letters 314 (1992), S. 275-279 
    Details
    ISSN: 0014-5793
    Keywords: Chlamydomonas reinhardtii ; Eyespot ; Photoreceptor ; Phototaxis ; Retinal analog ; Rhodopsin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(92)81488-8
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  • 2
    Electronic Resource
    Electronic Resource
    Photosynthesis modulates the sign of phototaxis of wild-type Chlamydomonas reinhardtii - Effects of red background illumination and 3-(3',4'-dichlorophenyl)-1,1-dimethylurea
    Amsterdam : Elsevier
    FEBS Letters 336 (1993), S. 516-520 
    Details
    ISSN: 0014-5793
    Keywords: Chlamydomonas reinhardtii ; Photosynthesis ; Phototaxis ; Phytochrome ; Rhodopsin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(93)80867-T
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  • 3
    Electronic Resource
    Electronic Resource
    Cytotoxicity of endogenous isoquinolines to human dopaminergic neuroblastoma SH-SY5Y cells (1997)
    Springer
    Journal of neural transmission 104 (1997), S. 59-66 
    Details
    ISSN: 1435-1463
    Keywords: Cytotoxicity ; isoquinolines ; N-methylsalsolinol ; 1,2-dimethyl-6,7-dihydroxyisoquinolinium ion ; neuroblastoma SH-SY5Y cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Endogenous isoquinolines with and without catechol structure have been proposed to be neurotoxins specific for dopamine neurons. In this paper they were examined for the cytotoxicity of human dopaminergic neuroblastoma SH-SY5Y cells. The cytotoxicity was quantitatively determined using Alamar Blue assay, by which the reduction-oxidation potency in the living cells can be measured spectrometrically. 1,2-Dimethyl-6,7-dihydroxyisoquinolinium ion [1,2-DMDHIQ+], an oxidation product of a parkinsonism-inducing isoquinoline, 1(R),2(N)-dimethyl-6,7-dihydroxy-1,2,3,4-tetrahyroisoquinoline [N-methyl-(R)salsolinol, NM(R)Sal] was found to be the most potent toxin among isoquinolines examined. In general, catechol isoquinolines were more toxic than isoquinolines without catechol structure. With and without catechol structure, the oxidized isoquinolinium ion having methyl groups at C-1 and N-2 positions proved to be more cytotoxic than the simple isoquinolines. The involvement of 1,2-DMDHIQ+ to the neurotoxicity of NM(R)Sal was suggested and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01271294
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructure and phototactic action spectra of two genera of cryptophyte flagellate algae, Cryptomonas and Chroomonas (1995)
    Springer
    Protoplasma 188 (1995), S. 258-266 
    Details
    ISSN: 1615-6102
    Keywords: Action spectrum ; Chroomonas ; Cryptomonas ; Cryptophyte ; Eyespot ; Phototaxis ; Phycobilin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A comparative action spectroscopical study was made on phototaxis in two genera of cryptomonads (cryptophyte flagellate algae), namely,Cryptomonas (rostratiformis) andChroomonas (nordstedtii andcoeruled). The two genera differ in their characteristic phycobilin pigmentation and, among three species, onlyChroomonas coerulea possesses an eyespot. The two species with no eyespot,Cryptomonas rostratiformis andChroomonas nordstedtii, exhibited positive phototaxis, showing very similar action spectra characterized by a broad band in the region from 450 nm to 650 nm, with an action maximum at about 560 nm; these features are essentially the same as those observed previously forCryptomonas strain CR-1. InCryptomonas rostratiformis, a small peak was also found at 280 nm in the UV-B/C region.Chroomonas coerulea, with eyespot, did not exhibit distinct positive phototaxis in a wide spectral region at any given, even very low, light intensity, but exhibited negative phototaxis of spectral sensitivity maximal at 400–450 nm. These results indicate that the positive phototaxis ofCryptomonas (rostratiformis and CR-1) andChroomonas nordstedtii is mediated by the same, yet unidentified photoreceptor(s).Chroomonas nordstedtii, possessing no phycoerythrin absorbing at 545 nm, also exhibits positive phototaxis at ca. 560 nm, and this result disfavors the so far proposed possibility that the positive phototaxis of the cryptophytes may be mediated by phycobilin pigments. On the other hand, the spectral characteristics of negative phototaxis ofChroomonas coerulea can possibly be ascribed to the presence of an eyespot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01280378
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  • 5
    Electronic Resource
    Electronic Resource
    Uptake of a neurotoxin-candidate, (R)-1,2-dimethyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline into human dopaminergic neuroblastoma SH-SY5Y cells by dopamine transport system (1994)
    Springer
    Journal of neural transmission 98 (1994), S. 107-118 
    Details
    ISSN: 1435-1463
    Keywords: Uptake ; inhibition ; dopamine transporter ; 1-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline ; 1,2-dimethyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline ; 1,2-dimethyl-6,7-dihydroxyisoquinolinium ion ; neuroblastoma SH-SY5Y cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Uptake of catechol isoquinolines to dopamine cells was studied using human dopaminergic neuroblastoma SH-SY5Y cells. Only (R)-1,2-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline [(R)-1,2-DiMeDHTIQ] was transported by dopamine uptake system, while (S)-1,2-DiMeDHTIQ, (R)- and (S)-1-methyl-6,7-dihydroxy-tetrahydroisoquinoline, and 1,2-dimethyl-6,7-dihydroxyisoquinolinum ion were not. Kinetical study showed that the uptake of (R)-1,2-DiMeDHTIQ followed the Michaelis-Menten equation, and the values of the Michaelis constant and the maximal velocity were obtained to be 102.6 ± 36.9 μM and 66.0 ± 2.8 pmol/min/mg protein. Dopamine was found to inhibit (R-1-DiMeDHTIQ uptake competitively. These results suggest that the selective uptake by dopamine transporter may account for the specific neurotoxicity of (R)-1,2-DiMeDHTIQ to dopamine neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01277014
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  • 6
    Electronic Resource
    Electronic Resource
    Crystallization behavior of polybutene-1 in the anisotropic system blended with polypropylene (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 34 (1987), S. 2757-2768 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Development of supermolecular structure in drawn polypropylene (PP)/polybutene-1 (PB-1) blends was studied. PP (matrix)/PB-1 (70/30) blend films were drawn and heat-treated at fixed length or free ends at temperatures above the melting point of PB-1. It was found that a long axis of the PB-1 lamella is aligned perpendicular to the draw direction, and the c-axis of the PB-1 crystal is oriented perpendicular both to the draw direction and the plane of the surface of the blend film. Drawn, then heat-treated PP/PB-1 blend films gave a SAX pattern having a cross type scattering maximum on the meridian. It was confirmed that vertical scattering originates from the PB-1 crystal developed during melt recrystallization. It was proposed that the structural development of PB-1 in drawn PP/PB-1 film can be explained on the basis of transcrystallization of PB-1 in the confined 2-dimensional space in the PP matrix. The kinetics of isothermal crystallization of PB-1 was examined by use of a DSC technique. The result supports the conclusion that the heterogeneous nucleation of PB-1 followed by 2-dimensional crystal growth prevailed in oriented PP/PB-1 blend film.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070340811
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  • 7
    Electronic Resource
    Electronic Resource
    Langmuir-Blodgett films of polymethacrylates with side chains containing functionalized aromatic schiff's bases (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 165-173 
    Details
    ISSN: 0887-6266
    Keywords: Langmuir-Blodgett film formation by polymethacrylates with nonlinear optical side chains ; polymethacrylate films by Langmuir-Blodgett technique, configuration of nonlinear optical substituents in ; orientation of nonlinear optical moieties in Langmuir-Blodgett films of substituted polymethacrylates ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Langmuir-Blodgett (LB) film formation has been investigated for polymers in which non-linear optical (NLO) moieties are attached to the side chain of a polymethacrylate (PMA) backbone. Polymer monolayers were successfully transferred onto hydrophilic glass substrates using a moving-wall type LB trough. The LB films were characterized by pressure-area isotherms, polarized ultraviolet visible spectra, ellipsometry, and second harmonic generation measurements. The characterization shows that NLO moieties in the side chain are inclined at a shallow angle to the plane of the substrate. The second-order nonlinear optical coefficient and molecular hyperpolarizability were also calculated. © 1993 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090310205
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  • 8
    Electronic Resource
    Electronic Resource
    Deformation band studies of axially compressed poly(p-phenylene terephthalamide) fiber (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 579-586 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Deformation mechanism of poly(p-phenylene terephthalamide) (PPTA) fiber during axial compression was studied. PPTA fibers were embedded in resin and axialy compressed in a tensile machine. PPTA fibers were then taken out from resin at various stages of compression. Kink band formation was examined by means of polarizing microscopy, X-ray diffraction (WAXD), electron diffraction (ED), and electron microscopy. WAXD pattern of seriously compressed PPTA fiber shows that (200) reflection spots and arcs appear on the equator and meridian respectively. On the other hand, (110) reflection spots are confined to the equator. PPTA fiber could be splitted tangentially and radially into two kinds of thin fibrillar fragments (I and II) which reveal two distinct types of kink band and ED pattern. In fragment I obtained by tangential splitting, kink bands are formed at about 55° with respect to fibril axis, whereas in fragment II obtained by radial splitting kink bands are formed perpendicular to the fibril axis. These results were confirmed by ED studies. It was assumed that slip of (200) planes containing hydrogen bonded sheets as well as intermicrofibril slip plays an important role in the deformation of PPTA fiber during axial compression.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280213
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  • 9
    Electronic Resource
    Electronic Resource
    Epitaxial crystallization of polyoxymethylene in the course of polymerization in aqueous solution (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 9 (1971), S. 895-899 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.110091205
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  • 10
    Electronic Resource
    Electronic Resource
    Epitaxial growth of polymer crystals on uniaxially drawn polymers (1970)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 8 (1970), S. 651-657 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1970.110080910
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