Results 181 to 190 of about 37,366 (283)

Enzyme‐Like Synthetic Cleft for Light‐Driven Water‐Oxidation Catalysis Via an Oxide Relay Pathway

Angewandte Chemie, EarlyView.
A carboxylic acid group introduced into the second coordination sphere of a Ru(bda) water oxidation catalyst forms a defined hydrogen bond within the catalytic cleft. This interaction locks the group in place and enables an intramolecular oxide relay pathway between Ru(V)═O and the carboxylate group, providing a distinct and efficient route for O─O ...
Daniel A. P. Friedewald, Gourab Das, Philipp H. Kirchner, Olga Anhalt, Deqi Tang, Sandra Luber, Florian Beuerle, Frank Würthner   +7 more
wiley   +2 more sources

Opposing seasonal trends in source water and sugar dampen intra-annual variability in tree rings oxygen isotopes. [PDF]

New Phytol
Szejner P, Tang Y, Angove C, Schiestl-Aalto P, Sahlstedt E, Young G, Nelson DB, Kahmen A, Saurer M, Rinne-Garmston KT.   +9 more
europepmc   +1 more source

Generation of the Camptothecin Scaffold by a Flavin‐Catalyzed Photooxidative Skeletal Reorganization

Angewandte Chemie, EarlyView.
The biosynthetic pathway of the anticancer drug precursor camptothecin involves an enigmatic skeletal reorganization from a 6/5/6 tetrahydro‐β‐carboline to a 6/6/5 pyrroloquinoline ring system. Here, we show that this transformation can be achieved by photooxidation with flavin cofactors, such as flavin mononucleotide (FMN) as catalysts.
Shenyu Liu, Zeliang Zhang, Benedikt Seligmann, Van Hung Bui, Tuan‐Anh Minh Nguyen, Thu‐Thuy T. Dang, Jakob Franke   +6 more
wiley   +2 more sources

Triple oxygen isotopes of lunar water unveil indigenous and cometary heritage. [PDF]

Proc Natl Acad Sci U S A
Thiemens MM, Martinez MHN, Thiemens MH.
europepmc   +1 more source

Oxygen Isotopes From Massive Stars

, 2007
. We investigate the yields of the three stable oxygen isotopes 16;17;18 O and their dependence on weakly constrained physical ingredients in pre-supernova models.
Langer Max-Planck, N. Langer
core  

A two-stage mantle plume-sagduction origin of Archean continental crust revealed by water and oxygen isotopes of TTGs. [PDF]

Sci Adv
Zhao D, Cawood PA, Teng FZ, Zhao G, Xia XP, Sun M, Wang X.   +6 more
europepmc   +1 more source

Chelator‐Free Radiometal Labeling Inside Engineered Affibodies

Angewandte Chemie, EarlyView.
Affibodies are compact and robust three‑helix binders used in imaging and therapy. Engineering a triple‑cysteine motif into their core enables chelator‑free binding of important radiometals, like Bi(III), Pb(II), In(III), and Ga(III) with rapid uptake and exceptional stability.
Lani J. Davies, Upamali Somathilake, Santhanalaxmi Kumaresan, Frank Bruchertseifer, Alfred Morgenstern, Sarah Spreckelmeyer, Christoph Nitsche   +6 more
wiley   +2 more sources

Tracing contamination in mining areas through sulfur and oxygen isotopes in groundwater sulfates: a case study from the Apuan Alps (Italy). [PDF]

Environ Geochem Health
Natali S, Franceschi L, Giannecchini R, D'Orazio M, Delgado-Huertas A, Zanchetta G, Doveri M.   +6 more
europepmc   +1 more source

Entropy‐Stabilized Aluminate Catalysts That Break the Activity–Stability Tradeoff in CF4 Hydrolysis

Angewandte Chemie, EarlyView.
Entropy‐stabilized aluminate breaks the activity–stability tradeoff in CF4 hydrolysis by combining a multication aluminate framework with an entropy‐stabilized lattice. An electron‐deficient Al–O environment is F‐philic but O‐phobic, enabling C–F activation while suppressing H2O poisoning. Under steam‐rich, strongly fluorinating conditions, the entropy‐
Seunghyuck Chi, Hyungmin Jeon, Yaejun Baik, DongHwan Oh, Jin Seok, Woosung Choi, Seungjun Lee, Minkee Choi   +7 more
wiley   +2 more sources

Highly enriched carbon and oxygen isotopes in carbonate-derived CO₂ at Gale crater, Mars. [PDF]

Proc Natl Acad Sci U S A
Burtt DG, Stern JC, Webster CR, Hofmann AE, Franz HB, Sutter B, Thorpe MT, Kite ES, Eigenbrode JL, Pavlov AA, House CH, Tutolo BM, Des Marais DJ, Rampe EB, McAdam AC, Malespin CA.   +15 more
europepmc   +1 more source