Biosynthesis and synthesis of natural colours / Timothy L. Dawson in COLORATION TECHNOLOGY, Vol. 125, N° 2 (2009)  

[article]  inCOLORATION TECHNOLOGY > Vol. 125, N° 2 (2009) . - p. 61-73 Titre : Biosynthesis and synthesis of natural colours Type de document : texte imprimé Auteurs : Timothy L. Dawson, Auteur Année de publication : 2009 Article en page(s) : p. 61-73 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : In nature, the detection of colours requires an organism having some type of eye with a retina and two or three types of photoreceptor connected to a nervous system, which can interpret the signals received. Evidence that certain simple organisms were coloured 1 billion years ago, and some more advanced creatures, which could have possessed eyes a few hundreds of million years ago, is exemplified. A vast array of chemicals essential to life are produced by living organisms and their biosynthesis depends upon individual genetic patterns, which determine the enzyme catalysts involved. Plants photosynthesise many pigments, which are essential for them to maximise the absorption of energy from the sun, while others offer protection from any harmful radiation. Such pigments, for example chlorophylls and the carotenoids, flavonoids and betalains, have traditionally been used as natural dyes, food colorants and medicines. This review compares the chemical processes involved in their biosynthesis and the laboratory methods adopted to confirm their chemical structure. Some engineered biosynthetic methods are now used for commercial production of natural colours and these methods may involve the controversial use of genetic engineering. DOI : 10.1111/j.1478-4408.2009.00177.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2009.00177.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4851 [article]

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Changing colours : now you see them, now you don’t / Timothy L. Dawson in COLORATION TECHNOLOGY, Vol. 126, N° 4 (2010)  

[article]  inCOLORATION TECHNOLOGY > Vol. 126, N° 4 (2010) . - p. 177-188 Titre : Changing colours : now you see them, now you don’t Type de document : texte imprimé Auteurs : Timothy L. Dawson, Auteur Année de publication : 2010 Article en page(s) : p. 177-188 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Nature offers a range of colour displays which are relatively short-lived and which were for many centuries little understood. Today we can explain most which arise from diffraction and reflection effects on rays of sunlight, various atmospheric ionisation phenomena and many colour effects resulting from biochemical reactions, although less is understood about some of the strange psychedelic patterns and colours which our brains can sometimes produce. The practical purposes to which certain fluorescent, thermochromic and photochromic dyes can be put, including their presently limited textile applications, are illustrated. Note de contenu : TRANSIENT COLOUR EFFECTS IN NATURE : Rainbows - Related light refraction effects - ionic discharge effects - Biological light effects - Bioluminescence - Transient effect in human colour vision. SYNTHETIC TRANSIENT COLOURS AND THEIR APPLICATION : Chemiluminescence - Short-term photoluminescence - Transient colours in chemical demonstration experiments. TRANSIENT LUMINESCENCE : Pyroluminescence - Mechanoluminescence. HEAT AND LIGHT-INDUCED COLOUR CHANGE : Thermochromism - Photochromism - Photo and thermochromic dyes for digital recording media. OTHER CHROMIC EFFECTS : Electrochromism and electroluminescence - Ionochromism - Solvatochromism. CONCLUSION AND FUTURE DEVELOPMENTS DOI : 10.1111/j.1478-4408.2010.00247.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00247.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9869 [article]

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Development of efficient and durable sources of white light / Timothy L. Dawson in COLORATION TECHNOLOGY, Vol. 126, N° 1 (2010)  

[article]  inCOLORATION TECHNOLOGY > Vol. 126, N° 1 (2010) . - p. 1-10 Titre : Development of efficient and durable sources of white light Type de document : texte imprimé Auteurs : Timothy L. Dawson, Auteur Année de publication : 2010 Article en page(s) : p. 1-10 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diodes électroluminescentes Index. décimale : 628.95 Eclairage Résumé : This review presents a brief history of the development of light sources over the centuries to provide one of the human race's basic needs – light. Recent moves in Europe to encourage the adoption of compact fluorescent lamps as more energy-efficient replacements for incandescent lights, despite certain drawbacks, are described. Rapid strides are now being made in the development of solid-state 'white' lights which are already sufficiently durable and efficient to warrant adoption for both domestic and public lighting purposes. Their basic construction and comparative performance, properties and uses are fully described, together with the many ideas for improving their brightness and durability still further. Solid-state devices offer additional savings compared with those which should be achieved under the EU's targeted replacement of incandescent lights by 2012, and later one can expect such devices to compete with high-pressure sodium luminaires for street lighting. DOI : 10.1111/j.1478-4408.2010.00220.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00220.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8411 [article]

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Examination, conservation and restoration of painted art / Timothy L. Dawson in COLORATION TECHNOLOGY, Vol. 123, N° 5 (2007)  

[article]  inCOLORATION TECHNOLOGY > Vol. 123, N° 5 (2007) . - p 281-292 Titre : Examination, conservation and restoration of painted art Type de document : texte imprimé Auteurs : Timothy L. Dawson, Auteur Année de publication : 2007 Article en page(s) : p 281-292 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : To conserve or restore painted artwork, it is necessary to appreciate the nature of the basic materials used in its creation, to be able to identify the pigments and the application media that were originally – or have subsequently been – applied and to understand the nature of gradual chemical and physical degradation that occurs within the various components of the system. With information thus gained, one can determine how best a painting may be cleaned, restored and ultimately be better preserved. This review covers the range of analytical techniques (mostly spectrographic), which have often been specifically developed to aid the identification of the wide range of inorganic colours and organic binders (or their degradation products) that may be present in each paint layer of an old masterpiece. Although an art gallery or museum strives to conserve the artefacts it displays, over time there will be varying degrees of mechanical or chemical damage. Cleaning (and, more controversially, restoration work) therefore becomes necessary and the much-improved methods now available for achieving this without associated adverse effects are reviewed. DOI : 10.1111/j.1478-4408.2007.00096.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2007.00096.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3219 [article]

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It must be green : meeting society's environmental concerns / Timothy L. Dawson in COLORATION TECHNOLOGY, Vol. 124, N° 2 (2008)  

[article]  inCOLORATION TECHNOLOGY > Vol. 124, N° 2 (2008) . - p. 67-78 Titre : It must be green : meeting society's environmental concerns Type de document : texte imprimé Auteurs : Timothy L. Dawson, Auteur Année de publication : 2009 Article en page(s) : p. 67-78 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Consumers today are increasingly demanding goods which not only conform to the public's image of being 'eco-friendly' and 'organic' but of having been produced 'ethically'. Meeting such high ideals has a down side, both in higher costs and often in that of having to accept more distant suppliers. Present trends in the coloration of foods with natural dyes rather than synthetic ones, increasing consumption of organic products (including fibres) and energy-saving trends in dye application methods, fuels and lighting, as well as the means of capturing solar energy, are discussed. The discovery of some interesting and historic green colours, the wider use of green (in both senses of the word) products and green chemistry's future role in producing them are also reviewed. DOI : 10.1111/j.1478-4408.2008.00124.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2008.00124.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3145 [article]

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Light-harvesting and light-protecting pigments in simple life forms / Timothy L. Dawson in COLORATION TECHNOLOGY, Vol. 123, N° 3 (2007)  

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Nanomaterials for textile processing and photonic applications / Timothy L. Dawson in COLORATION TECHNOLOGY, Vol. 124, N° 5 (2008)  

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Textile ink jet printing / Timothy L. Dawson / Bradford [Royaume-Uni] : The Society of Dyers and Colourists (2004)

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