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Bls 1 frá 2898 niðurstöður
Water, water everywhere, and its remarkable chemistry.
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Photosystem II (PSII), the multisubunit pigment-protein complex localised in the thylakoid membranes of oxygenic photosynthetic organisms, uses light energy to drive a series of remarkable reactions leading to the oxidation of water. The products of this oxidation are dioxygen, which is released to
Photosynthetic water oxidation: the role of tyrosine radicals.
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This mini-review outlines the involvement of the tyrosine electron carriers, Y(D) and Y(Z), in the mechanism of electron transfer from water to P680. We discuss our data and put forward our ideas on the role of Y(D) and Y(Z).
Solution properties of synthetic polypeptides. Assignment of the conformation of poly(L-tyrosine) in water and in ethanol-water solutions.
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Water metabolism in the eel acclimated to sea water: from mouth to intestine.
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Eels seem to be a suitable model system for analysing regulatory mechanisms of drinking behavior in vertebrates, since most dipsogens and antidipsogens in mammals influence the drinking rate in the seawater eels similarly. The drinking behavior in fishes consists of swallowing alone, since they live
Nitration of Tyrosine Channels Photoenergy through a Conical Intersection in Water.
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Nitration of tyrosine occurs under oxidative stress in vivo. The product, 3-nitrotyrosine (3NY), has a dramatically decreased quantum yield and can be used as a molecular ruler. In this study, femtosecond transient absorption spectroscopy and quantum calculations were implemented to elucidate the
A functional role for tyrosine-D in assembly of the inorganic core of the water oxidase complex of photosystem II and the kinetics of water oxidation.
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The role of D2-Tyr160 (Y(D)), a photooxidizable residue in the D2 reaction center polypeptide of photosystem II (PSII), was investigated in both wild type and a mutant strain (D2-Tyr160Phe) in which phenylalanine replaces Y(D) in the cyanobacterium Synechocystis sp. (strain PCC 6803). Y(D) is the
Water oxidation chemistry of photosystem II.
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Photosystem II (PSII) uses light energy to split water into protons, electrons and O2. In this reaction, nature has solved the difficult chemical problem of efficient four-electron oxidation of water to yield O2 without significant amounts of reactive intermediate species such as superoxide,
Water oxidation chemistry of photosystem II.
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The O(2)-evolving complex of photosystem II catalyses the light-driven four-electron oxidation of water to dioxygen in photosynthesis. In this article, the steps leading to photosynthetic O(2) evolution are discussed. Emphasis is given to the proton-coupled electron-transfer steps involved in
Counting of labelled tyrosine molecules in hydrophobic yoctolitre wells filled with water.
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Time-dependent radioactivity and solid-state 13C-NMR measurements of tyrosine entrapped in water-filled yoctolitre (10(-24) L) wells with hydrophobic walls are reported; the results indicate that such wells induce the formation of quasi solid tyrosine if they are brought in contact with 0.1 M
From water to oxygen and back again: mechanistic similarities in the enzymatic redox conversions between water and dioxygen.
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We propose that the interconversions of water and oxygen are catalyzed by the transition metal ions of Photosystem II and cytochrome c oxidase in remarkably similar ways. Oxygen-oxygen bond formation and cleavage occurs between two oxygen atoms that are bound as terminal ligands to two redox-active
Water deprivation and rat adrenal mRNAs for tyrosine hydroxylase and the norepinephrine transporter.
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Experiments were performed in rats to test the hypothesis that adrenal mRNA levels of tyrosine hydroxylase (TH) and the norepinephrine transporter (NET) would be modified by water deprivation via activation of the sympathetic nervous system. TH and NET mRNA levels were measured using the
A Water-Bridged Cysteine-Cysteine Redox Regulation Mechanism in Bacterial Protein Tyrosine Phosphatases.
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The emergence of multidrug-resistant Mycobacterium tuberculosis (Mtb) strains highlights the need to develop more efficacious and potent drugs. However, this goal is dependent on a comprehensive understanding of Mtb virulence protein effectors at the molecular level. Here, we used a post-expression
Dispersion of single-walled carbon nanotubes modified with poly-l-tyrosine in water.
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In this study, complexes composed of poly-l-tyrosine (pLT) and single-walled carbon nanotubes (SWCNTs) were produced and the dispersibility of the pLT/SWCNT complexes in water by measuring the ζ potential of the complexes and the turbidity of the solution were investigated. It is found that the
Water-molecule network and active-site flexibility of apo protein tyrosine phosphatase 1B.
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Protein tyrosine phosphatase 1B (PTP1B) plays a key role as a negative regulator of insulin and leptin signalling and is therefore considered to be an important molecular target for the treatment of type 2 diabetes and obesity. Detailed structural information about the structure of PTP1B, including
An investigation of changes in water quality throughout the drinking water production/distribution chain using toxicological and fluorescence analyses.
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Changes in water quality from source water to finished water and tap water at two conventional drinking water treatment plants (DWTPs) were monitored. Beside the routine water quality testing, Caenorhabditis elegans-based toxicity assays and the fluorescence excitation-emission matrices technique
Heillasta gagnagrunnur lækningajurtanna sem studdur er af vísindum
- Virkar á 55 tungumálum
- Jurtalækningar studdir af vísindum
- Jurtaviðurkenning eftir ímynd
- Gagnvirkt GPS kort - merktu jurtir á staðsetningu (kemur fljótlega)
- Lestu vísindarit sem tengjast leit þinni
- Leitaðu að lækningajurtum eftir áhrifum þeirra
- Skipuleggðu áhugamál þitt og vertu vakandi með fréttarannsóknum, klínískum rannsóknum og einkaleyfum
Sláðu inn einkenni eða sjúkdóm og lestu um jurtir sem gætu hjálpað, sláðu jurt og sjáðu sjúkdóma og einkenni sem hún er notuð við.
* Allar upplýsingar eru byggðar á birtum vísindarannsóknum
