Search for dissertations about: "UV absorption"

Showing result 1 - 5 of 115 swedish dissertations containing the words UV absorption.

2. 1. Quantum Chemical Studies of Protein-Bound Chromophores, UV-Light Induced DNA Damages, and Lignin Formation

   Author : Bo Durbeej; Leif Eriksson; Tim Clark; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Quantum chemistry; quantum chemistry; calculations; density functional theory; excited states; photochemistry; chromophores; absorption spectra; bathochromic shift; isomerization; UV radiation; DNA damages; cycloaddition reactions; photoenzymic repair; electron transfer; lignin; polymerization; phenoxy radicals; dilignols; Kvantkemi; Quantum chemistry; Kvantkemi;

   Abstract : Quantum chemical methods have been used to provide a better understanding of the photochemistry of astaxanthin and phytochromobilin; the photoenzymic repair of UV-light induced DNA damages; and the formation of lignin. The carotenoid astaxanthin (AXT) is responsible for the colouration of lobster shell. READ MORE

4. 2. Interstellar absorption across the electromagnetic spectrum

   Author : Achim Tappe; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; interstellar medium ISM : general; supernova remnants Crab Nebula ; emission lines; — quasars: absorption lines;

   Abstract : We report results of a multi-wavelength study of interstellar absorption in diffuse molecular clouds that lie in the direction of flat-spectrum quasars. Quasars as back-ground sources allow the measurement of Galactic interstellar absorption across the electromagnetic spectrum from mm to X-ray wavelengths. READ MORE

5. 3. Laser Absorption Spectroscopy of Gas in Scattering Media

   Author : Märta Lewander; Atomfysik; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; medical diagnosis; gas analysis; absorption spectroscopy; diode laser spectroscopy; light scattering; food-package monitoring; GASMAS;

   Abstract : Absorption spectroscopy constitutes a chemical analysis tool which can be applied to various samples and application fields. This thesis focuses on gas absorption spectroscopy with the means of diode lasers - tunable diode laser absorption spectroscopy, TDLAS. READ MORE

6. 4. Vitamin B6 as a potential antioxidant : a study emanating from UV-B-stressed plants

   Author : Mikael Ristilä; Åke Strid; Leif Eriksson; Éva Hideg; Örebro universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Arabidopsis; UV-B irradiation; pyridoxine; vitamin B6; ROS; Chemistry; Kemi; Chemistry; Kemi;

   Abstract : Increased influx of solar UV-B radiation (280-320 nm), due to a decreasing stratospheric ozone layer, impacts severely on plants. Some of the UV-B effects on plants are related to stress induced by produced reactive oxygen species (ROS). Pyridoxine (vitamin B6) has been reported to be a potential quencher of ROS. READ MORE

7. 5. Surface modification of birch and acetylated birch wood by silicone nanofilaments

   Author : Haiyan Yin; Magnus Wålinder; Agne Swerin; Andra Dédinaité; Jan Van den Bulcke; KTH; []
   Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acetylated wood; surface modification; superhydrophobicity; plastron; wetting; silicone nanofilaments; UV irradiation; mold resistance; blue stain.; Acetylerat trä; ytmodifiering; superhydrofobicitet; plastron; vätning; silikon-nanofilament; UV-bestrålning; mögelresistens; blånad.; Building Materials; Byggnadsmaterial;

   Abstract : The increasing awareness of sustainability motivates the development of building materials from renewable resources. The requirements of wood-based products with improved durability, for example, enhanced liquid repellence and UV and biological resistance, are still a challenge. READ MORE