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Bibliografie tematiche / Photoresponsiveness

Letteratura scientifica selezionata sul tema "Photoresponsiveness"

Autore: Grafiati

Pubblicato: 7 luglio 2024

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Articoli di riviste sul tema "Photoresponsiveness"

1

Puchalski, W., e G. R. Lynch. "Circadian characteristics of Djungarian hamsters: effects of photoperiodic pretreatment and artificial selection". American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 261, n. 3 (1 settembre 1991): R670—R676. http://dx.doi.org/10.1152/ajpregu.1991.261.3.r670.

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Abstract (sommario):

Bidirectional artificial selection for (High Line) and against (Low Line) photoresponsiveness altered the percent of photoresponsive hamsters within lines and affected circadian function of hamsters identical in photoresponsiveness. For example, free-running period was shorter in responsive relative to nonresponsive hamsters. Between-line differences for responders and nonresponders were also found: hamsters from the High Line had a shorter free-running period relative to Low Line hamsters. However, phase angle of entrainment to long and short days was not affected. In general, expression of circadian rhythmicity was extraordinarily inflexible in photononresponsive hamsters from both lines: 1) phase angle of entrainment to lights on was similar under short and long day; 2) activity duration was similar under long and short days, although some decompression occurred in constant dark; 3) aftereffects on the free-running period were absent; and 4) amplitude of the phase-response curve was small (+/- 1 h) and present only at circadian times 10-24. We propose that selection for or against photoresponsiveness may have affected the interaction of component oscillators underlying circadian rhythmicity.

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2

Park, Junsu, Yuki Shimizu, Xin Zhou, Ryohei Ikura, Go Matsuba e Yoshinori Takashima. "Water-Content-Dependent Switching of the Bending Behavior of Photoresponsive Hydrogels Composed of Hydrophilic Acrylamide-Based Main Chains and Hydrophobic Azobenzene". Gels 9, n. 8 (16 agosto 2023): 658. http://dx.doi.org/10.3390/gels9080658.

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Abstract (sommario):

Photoresponsiveness is a promising characteristic of stimulus-responsive materials. Photoresponsiveness can be achieved by incorporating photoresponsive molecules into polymeric materials. In addition, multiple-stimuli-responsive materials have attracted scientists’ interest. Among the numerous multiple-stimuli-responsive materials, moisture- and photoresponsive materials are the focus of this report. These stimuli-responsive materials responded to the stimuli synergistically or orthogonally. Unlike most stimulus-responsive materials utilizing moisture and light as stimuli, the materials studied herein switch their photoresponsiveness in the presence of moisture. Appropriate copolymers consisting of hydrophilic acrylamide-based monomers for the main chain and hydrophobic azobenzene moieties switched their bending behaviors at 6–9 wt% water contents. At water contents lower than 6 wt%, the polymeric materials bent away from the light source, while they bent toward the light source at water contents higher than 10 wt%. At a low water content, the bending behaviors can be described on the molecular scale. At a high water content, the bending behavior requires consideration of the phase scale, not only the molecular scale. By controlling the balance between hydrophilicity and hydrophobicity, the switching behavior was achieved. This switching behavior may inspire additional strategies for the application of polymeric material as actuators.

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3

Nishida, Jun-ichi, Yoshiki Morikawa, Akito Hashimoto, Yasuyuki Kita, Hiroshi Nishimoto, Tomofumi Kadoya, Hiroyasu Sato e Takeshi Kawase. "Synthesis and electron-transport properties of N-trifluoromethylphenyl-phthalimides containing selenophene substituents". Materials Advances 2, n. 24 (2021): 7861–68. http://dx.doi.org/10.1039/d1ma00716e.

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Trifluoromethylphenyl substituted phthalimides containing oligoselenophene or phenylselenophene substituents were synthesized, and their n-type semiconductor properties and photoresponsiveness were investigated.

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4

Tazuke, Shigeo, Seiji Kurihara, Hideki Yamaguchi e Tomiki Ikeda. "Photochemically triggered physical amplification of photoresponsiveness". Journal of Physical Chemistry 91, n. 2 (gennaio 1987): 249–51. http://dx.doi.org/10.1021/j100286a001.

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5

Miller, Joel S., e Arthur J. Epstein. "Molecule-Based Magnets—An Overview". MRS Bulletin 25, n. 11 (novembre 2000): 21–30. http://dx.doi.org/10.1557/mrs2000.221.

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Molecule-based magnets are a broad, emerging class of magnetic materials that expand the materials properties typically associated with magnets to include low density, transparency, electrical insulation, and low-temperature fabrication, as well as combine magnetic ordering with other properties such as photoresponsiveness. Essentially all of the common magnetic phenomena associated with conventional transition-metal and rare-earth-based magnets can be found in molecule-based magnets. Although discovered less than two decades ago, magnets with ordering temperatures exceeding room temperature, very high (∼27.0 kOe or 2.16 MA/m) and very low (several Oe or less) coercivities, and substantial remanent and saturation magnetizations have been achieved. In addition, exotic phenomena including photoresponsiveness have been reported. The advent of molecule-based magnets offers new processing opportunities. For example, thin-film magnets can be prepared by means of low-temperature chemical vapor deposition and electrodeposition methods.

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6

Francisco, Nicole R., Christen M. Raymond e Paul D. Heideman. "Short photoperiod inhibition of growth in body mass and reproduction in ACI, BUF, and PVG inbred rats". Reproduction 128, n. 6 (dicembre 2004): 857–62. http://dx.doi.org/10.1530/rep.1.00390.

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Laboratory rats have been generally considered non-photoresponsive, but strains of laboratory rats have been found to be variable for this trait. Young males of both the Fischer (F344) and Brown Norway strains (BN) suppress reproductive development, food intake and body mass in short winter photoperiod (short days (SD); 8 h light:16 h darkness), and food restriction interacts with SD to enhance the effect of SD alone. Conversely, young male Harlan Sprague Dawley outbred rats, along with other outbred laboratory rats tested, have little or no response to SD except when unmasked by food restriction or other treatments, and have generally been considered nonphotoperiodic. In order to assess how widespread this trait might be among rat strains, and to test for uncoupling of reproductive and nonreproductive responses, we tested 3 additional inbred strains, including ACI, PVG and BUF rats, for photoresponsiveness and for unmasking of photoperiodic responses by food restriction. Young males of all three inbred strains exhibited photoresponsiveness in testis mass (5–20% lower in SD), seminal vesicle mass (20–50% lower in SD), and body mass (5–10% lower in SD). Food restriction also suppressed reproduction, but there was little or no interaction with the effects of photoperiod. The results are consistent with the hypothesis that laboratory rats are genetically variable for photoperiodism, and that photoresponsiveness may be widespread among inbred rat strains, as all five inbred strains tested have shown photoperiodic responses. The results are particularly important because standard research protocols may unknowingly manipulate this pathway in rats, causing unsuspected variability among or within studies.

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7

Desjardins, Claude, F. H. Bronson e James L. Blank. "Genetic selection for reproductive photoresponsiveness in deer mice". Nature 322, n. 6075 (luglio 1986): 172–73. http://dx.doi.org/10.1038/322172a0.

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8

Singh, Kehar, e A. K. Shukla. "Studies on electrosynthesis and photoresponsiveness of (ZnCd)Se". Solar Energy Materials and Solar Cells 30, n. 2 (luglio 1993): 169–75. http://dx.doi.org/10.1016/0927-0248(93)90018-x.

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9

Heideman, Paul D., e C. John Sylvester. "Reproductive Photoresponsiveness in Unmanipulated Male Fischer 344 Laboratory Rats1". Biology of Reproduction 57, n. 1 (1 luglio 1997): 134–38. http://dx.doi.org/10.1095/biolreprod57.1.134.

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10

Medger, K., C. T. Chimimba e N. C. Bennett. "Reproductive photoresponsiveness in male spiny mice from South Africa". Journal of Zoology 286, n. 4 (1 novembre 2011): 243–49. http://dx.doi.org/10.1111/j.1469-7998.2011.00872.x.

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Più fonti

Tesi sul tema "Photoresponsiveness"

1

Majoy, Sean Bradford. "Circadian Rhythms and Melatonin Receptors as Sources of Individual Variation in Reproductive Photoresponsiveness". W&M ScholarWorks, 1999. https://scholarworks.wm.edu/etd/1539626215.

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2

Sylvester, Christopher John. "A Demonstration of Photoresponsiveness in Laboratory Rats using Whole Animal and Neuroendocrine Approaches". W&M ScholarWorks, 1997. https://scholarworks.wm.edu/etd/1539626097.

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3

Louttani, Salma. "Boite moléculaire photostimulable pour la délivrance de principes actifs". Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASF088.

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Abstract (sommario):

Le travail réalisé dans le cadre de cette thèse consiste à étudier de nouveaux vecteurs de principe actif (PA) à base de nanotube de cyclodextrines (CD). Une première partie a permis de converger vers le choix de la γ-CD comme précurseur du nanotube compte tenu des résultats obtenus en complexant de nombreux principes actifs. Après avoir synthétisé le nanotube de γ-CD à grande échelle, les conditions de complexation ont été optimisées et transposées à différents nanotubes en termes de longueur et de ponts inter-CD. Une corrélation entre la structure et la cinétique de libération de PA a ainsi pu être établi et permet aujourd'hui d'affiner la structure selon les propriétés requises. C'est d'ailleurs dans cet objectif que la synthèse du nouveau nanotube portant des extrémités photostimulables de type azobenzène a été mise au point. Après avoir optimisé la synthèse d'un nouveau dérivé hétérobifonctionnel d'azobenzène, la synthèse d'un nouveau polyrotaxane a pu être étudiée afin d'obtenir un nombre de molécules cycliques et d'azobenzène compatible avec la structure du nanotube désiré. Le composé a donc été obtenu avec succès et a permis d'isoler et caractériser ce nouveau nanotube. Une étude photochimique de celui-ci a mis en évidence l'ouverture sous stimuli UV ce qui permet à ce jour d'envisager l'étude du complexe nanotube/curcumine en biologie
The work described in this thesis consists in the study of new vectors for active substances based on cyclodextrin (CD) nanotubes. The first part discussed about the choice of γ-CD as nanotube precursor, thanks to the results obtained by complexation of several active substances. After large scale synthesis of γ-CD nanotubes, the complexation conditions have been optimized and extended to nanotubes with different length and inter-CD bridges. A correlation between structure and the kinetics of active substance release has been carried out and allowed to refine the structure according to the has desired properties. For this purpose, the synthesis of a nanotube bearing photoswitchable extremities based on azobenzene moieties been investigated. After the synthesis optimization of a new heterodifunctional azobenzene derivative, the synthesis of a new polyrotaxane has been optimized to obtain a number of cyclic molecules and azobenzenes compatible with the structure of the desired nanotube. This compound has been successfully isolated and characterized such as new nanotube. A photochemical study evidenced the opening nanotube under UV stimuli, which lead to the use of the nanotube/curcumin complex in biology

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Libri sul tema "Photoresponsiveness"

1

Montagnoli, G. Molecular Models of Photoresponsiveness. Springer, 2013.

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2

Montagnoli, G. Molecular Models of Photoresponsiveness. Springer, 2013.

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Rapporti di organizzazioni sul tema "Photoresponsiveness"

1

Marye Ann Fox e James Whitesell. Photoresponsiveness and Light Harvesting in Synthetic Nanowires, Nanosheets and Nanospheres. Office of Scientific and Technical Information (OSTI), maggio 2004. http://dx.doi.org/10.2172/951175.

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