Results 191 to 200 of about 18,931 (242)

Metamorphosis of Tetrapyrrole Macrocycles

ChemInform, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Mathias O, Senge, Natalia N, Sergeeva
openaire   +2 more sources

Tetrapyrrole macrocycle based conjugated two-dimensional mesoporous polymers and covalent organic frameworks: From synthesis to material applications

Coordination chemistry reviews, 2017
Significant progress has been achieved in the synthesis of covalent organic frameworks (COFs) or mesoporous polymers (MPs) with various application potentials in the past decade. Integration of tetrapyrrole chromophores, i.e. porphyrin and phthalocyanine,
Kang Wang, Dong-Dong Qi, Yu-Liang Li, Tianyu Wang, Hui-Biao Liu, Jian-Zhuang Jiang   +5 more
semanticscholar   +1 more source

Tetrapyrrole Biosynthesis in Higher Plants

Annual Review of Plant Biology, 2007
Tetrapyrroles play vital roles in various biological processes, including photosynthesis and respiration. Higher plants contain four classes of tetrapyrroles, namely, chlorophyll, heme, siroheme, and phytochromobilin. All of the tetrapyrroles are derived from a common biosynthetic pathway.
Ryouichi, Tanaka, Ayumi, Tanaka
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A reaction of the superoxide radical with tetrapyrroles

Archives of Biochemistry and Biophysics, 1982
Bilirubin and biliverdin were bleached during exposure to the aerobic xanthine oxidase reaction. Enzymic scavenging of O2−, by Superoxide dismutase, inhibited, whereas enzymic scavenging of H2O2, by catalase, did not. Increasing the rate of production of O2− without increasing the turnover rate of xanthine oxidase, by increasing pO2, accelerated the ...
P, Robertson, I, Fridovich
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Aerobic Enzymes and Their Radical SAM Enzyme Counterparts in Tetrapyrrole Pathways.

Biochemistry, 2018
Microorganisms have lifestyles and metabolism adapted to environmental niches, which can be very broad or highly restricted. Molecular oxygen (O2) is currently variably present in microenvironments and has driven adaptation and microbial differentiation ...
B. Li, J. Bridwell-Rabb
semanticscholar   +1 more source

Evolution of tetrapyrrole pathway in eukaryotic phototrophs

Advances in Botanical Research, 2019
Tetrapyrroles such as chlorophyll and heme are involved in conversion of the light energy to chemical bonds by photosynthetic electron transfer as well as phosphorylation and participation as cofactor in various enzymatic activities and in cellular ...
Jaromír Cihlář, Z. Füssy, M. Oborník   +2 more
semanticscholar   +1 more source

Tetrapyrrole Macroheterocyclic Compounds. Structure–Property Relationships

Journal of Structural Chemistry, 2023
T. Basova, D. V. Belykh, A. Vashurin, D. D. Klyamer, O. Koifman, P. Krasnov, T. Lomova, I. Loukhina, E. Motorina, G. Pakhomov, M. Polyakov, A. S. Semeikin, P. Stuzhin, A. Sukhikh, V. Travkin   +14 more
semanticscholar   +1 more source

Naturally Occurring Cyclic Tetrapyrroles

2002
Of the porphyrinoid structures occurring in nature the most important and most widespread are the red blood pigment heme (1), the green pigment of plant photosynthesis chlorophyll a (2), the bacterial photo-synthetic pigment bacteriochlorophyll a (3), and the “antipernicious” red pigment vitamin B12 (4).
F P, Montforts, M, Glasenapp-Breiling
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Chiral Sensing by Nonchiral Tetrapyrroles

Accounts of Chemical Research, 2015
Enantiomeric excess (ee) is a measure of the purity of an enantiomer of a chiral compound with respect to the presence of the complementary enantiomer. It is an important aspect of chemistry, especially in the fields of pharmaceuticals and asymmetric catalysis. Existing methods for determination of enantiomeric excesses using nuclear magnetic resonance
Jan, Labuta, Jonathan P, Hill, Shinsuke, Ishihara, Lenka, Hanyková, Katsuhiko, Ariga   +4 more
openaire   +2 more sources

Origin of Panchromaticity in Multichromophore-Tetrapyrrole Arrays.

Journal of Physical Chemistry A, 2018
Panchromatic absorbers that have robust photophysical properties enable new designs for molecular-based light-harvesting systems. Herein, we report experimental and theoretical studies of the spectral, redox, and excited-state properties of a series of ...
Jonathan M. Yuen, J. Diers, Eric J Alexy, Arpita Roy, A. Mandal, H. Kang, D. Niedzwiedzki, C. Kirmaier, J. Lindsey, D. Bocian, D. Holten   +10 more
semanticscholar   +1 more source