نتایج جستجو برای: singlet oxygen

تعداد نتایج: 218690  

2014
Setsuko Wakao Brian L Chin Heidi K Ledford Rachel M Dent David Casero Matteo Pellegrini Sabeeha S Merchant Krishna K Niyogi

Singlet oxygen is a highly toxic and inevitable byproduct of oxygenic photosynthesis. The unicellular green alga Chlamydomonas reinhardtii is capable of acclimating specifically to singlet oxygen stress, but the retrograde signaling pathway from the chloroplast to the nucleus mediating this response is unknown. Here we describe a mutant, singlet oxygen acclimation knocked-out 1 (sak1), that lac...

2014
Yuanyuan Zhao Yang Liu Qianfeng Xu Mark Barahman Dorota Bartusik Alexander Greer Alan M. Lyons

We describe physical-organic studies of singlet oxygen generation and transport into an aqueous solution supported on superhydrophobic surfaces on which silicon-phthalocyanine (Pc) particles are immobilized. Singlet oxygen ((1)O2) was trapped by a water-soluble anthracene compound and monitored in situ using a UV-vis spectrometer. When oxygen flows through the porous superhydrophobic surface, s...

Photosensitization properties of coronene-purine (Cor-P) hybrids for photodynamic therapy (PDT) have been investigated in this work. Eight hybrid Cor-P models have been designed by the additional of adenine (A) and guanine (G) nucleobase to Cor species. The evaluated absorption and emission energies indicated that the singular models are not good at all for PDT process whereas their hybrid mode...

Journal: :FEMS microbiology letters 2008
Panatda Saenkham Supa Utamapongchai Paiboon Vattanaviboon Skorn Mongkolsuk

Singlet oxygen is a highly reactive form of molecular oxygen that is harmful to biological systems. Here, the role of three iron-containing superoxide dismutase (sodB) genes is clearly shown in protecting Agrobacterium tumefaciens against singlet oxygen toxicity. A sodBI mutant was more sensitive to singlet oxygen than both wild-type bacteria and a double sodBII-sodBIII mutant strain. Moreover,...

2011
Keisuke Nakamura Kirika Ishiyama Hiroyo Ikai Taro Kanno Keiichi Sasaki Yoshimi Niwano Masahiro Kohno

The aim of the present study is to compare different analytical methods for singlet oxygen and to discuss an appropriate way to evaluate the yield of singlet oxygen photogenerated from photosensitizers. Singlet oxygen photogenerated from rose bengal was evaluated by electron spin resonance analysis using sterically hindered amines, spectrophotometric analysis of 1,3-diphenylisobenzofuran oxidat...

2013
Saurabh Jyoti Sarma Satinder Kaur Brar

Copyright: © 2013 Sarma SJ, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Electronically excited, highly reactive state of molecular oxygen is known as singlet oxygen. Apart from different other metho...

Journal: :Microbiology 2005
Jens Glaeser Gabriele Klug

In Rhodobacter sphaeroides, carotenoids are essential constituents of the photosynthetic apparatus and are assumed to prevent the formation of singlet oxygen by quenching of triplet bacteriochlorophyll a (BChl a) in vivo. It was shown that small amounts of singlet oxygen are generated in vivo by incubation of R. sphaeroides under high light conditions. However, growth and survival rates were no...

Journal: :EMBO reports 2008
Chanhong Kim Rasa Meskauskiene Klaus Apel Christophe Laloi

When plant cells are under environmental stress, several chemically distinct reactive oxygen species (ROS) are generated simultaneously in various intracellular compartments and these can cause oxidative damage or act as signals. The conditional flu mutant of Arabidopsis, which generates singlet oxygen in plastids during a dark-to-light transition, has allowed the biological activity of singlet...

Journal: :Photochemistry and photobiology 2011
Anita Gollmer Jacob Arnbjerg Frances H Blaikie Brian Wett Pedersen Thomas Breitenbach Kim Daasbjerg Marianne Glasius Peter R Ogilby

The development of efficient and selective luminescent probes for reactive oxygen species, particularly for singlet molecular oxygen, is currently of great importance. In this study, the photochemical behavior of Singlet Oxygen Sensor Green(®) (SOSG), a commercially available fluorescent probe for singlet oxygen, was examined. Despite published claims to the contrary, the data presented herein ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2007
Tim Maisch Jürgen Baier Barbara Franz Max Maier Michael Landthaler Rolf-Markus Szeimies Wolfgang Bäumler

New antibacterial strategies are required in view of the increasing resistance of bacteria to antibiotics. One promising technique involves the photodynamic inactivation of bacteria. Upon exposure to light, a photosensitizer in bacteria can generate singlet oxygen, which oxidizes proteins or lipids, leading to bacteria death. To elucidate the oxidative processes that occur during killing of bac...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید