Photochemistry of unsaturated polymers

Radiation induced photochemical reactions in polyisoprene and polybutadiene thin films including microstructural change

X-ray and electron damage, and photochemical reactions in CdS single crystals and layers, and annealing of these defects Final report

X-ray and electron damage and photochemical reactions in CdS single crystals and layers with defect annealin

Complete Reaction Studies in Exobiology - the Chemistry and Photochemistry of Nucleic Acid Constituents and Related Compounds, and Their Detection, Characterization, and Isolation Semiannual Progress Report No. 4 /final/

Fluorescence spectra for purines, guanine, and benzimidazole - photolysis and photochemical reactions of nucleotide derivatives and isolation of their photolytic primary product

Probing Mechanisms of Photochemical Reactions: How to Teach a Young Dog Old Tricks

The mechanism of photochemical reactions can be difficult to study because of the very short-lived intermediates involved. State-of-the art ultrafast spectroscopic tools can be used to probe these processes, but we will show in this account that old- fashioned techniques, such as the determination of quantum yields, the measurement of isotope effects or the use of triplet quenchers and sensitizers still can give a significant insight into the mechanism of photochemical reactions

Biomedical applications of photochemistry

Photochemistry is the study of photochemical reactions between light and molecules. Recently, there have been increasing interests in using photochemical reactions in the fields of biomaterials and tissue engineering. This work revisits the components and mechanisms of photochemistry and reviews biomedical applications of photochemistry in various disciplines, including oncology, molecular biology, and biosurgery, with particular emphasis on tissue engineering. Finally, potential toxicities and research opportunities in this field are discussed. © 2010 Mary Ann Liebert, Inc.published_or_final_versio

GENERAL ASPECTS OF PHOTOCHEMISTRY TO HUMAN

Photochemistry, the study of chemical reaction initiated by light plays an important role to human lifes. Photochemical reaction is intiated by the absorption of light giving excited molecules. The excited molecules, depending upon their structures and environment, may undergo various chemical reactions. Some very important and beneficial photochemical reactions occur in human body such as photochemical reaction of vision, the formation of vitamin D, and psoriasis medication. On the other hand, some photochemical reactions result in harmful effect to human, for examples, skin ageing, skin cancer, and cornea damage. Photosynthesis and photodegradation of pesticides are examples of photochemical reaction in the environment which are beneficial to human ienterset. In addition photochemical concept has been employed to synthesise drugs, nylon, and alkane-sulphates (detergents). However, some photochemical reactions create problem in the environment, i.e., formation of photochemical smogs, ozon layer depletion, and photodegaradion of drugs All those aspects of photochemistry are illustrated in this article.Key words: photochemistry, excited molecule, photodegradation, photooxidation, photosynthesis

Photochemical synthesis of a “cage” compound in a microreactor: Rigorous comparison with a batch photoreactor

An intramolecular [2 + 2] photocycloaddition is performed in a microphotoreactor (0.81 mL) built by winding FEP tubing around a commercially available Pyrex immersion well in which a medium pressure mercury lamp is inserted. A rigorous comparison with a batch photoreactor (225 mL) is proposed by means of a simple model coupling the reaction kinetics with the mass, momentum and radiative transfer equations. This serves as a basis to explain why the chemical conversion and the irradiation time are respectively increased and reduced in the microphotoreactor relative to those in the batch photoreactor. Through this simple model reaction, some criteria for transposing photochemical synthesis from a batch photoreactor to a continuous microphotoreactor are defined

Atmospheric Physics

The possibility of extending the atmospheric observation from space is discussed. Observations of the earth's limb from GEO at microwave frequencies, global mapping of ozone, charged particle precipitation, photochemical reactions, spectral emissions from the atmosphere, microwave measurements, and radio probing of the atmosphere and ionosphere, which were not feasible prior to the availability of the shuttle because of the antenna limitations, may be readily carried out from the space stations