Results 51 to 60 of about 40,114 (276)

Aromaticity and Antiaromaticity: How to Define Them

Chemistry
Aromaticity and antiaromaticity are concepts that are often used to explain and predict the physical and chemical properties of cyclic conjugated compounds.
Marija Baranac-Stojanović
doaj   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

Unraveling aromaticity: the dual worlds of pyrazole, pyrazoline, and 3D carborane

Beilstein Journal of Organic Chemistry
A new series of o-carborane-fused pyrazoles has been recently successfully synthesized. This fusion was expected to create a hybrid 3D/2D aromatic system, combining the 3D aromaticity of o-carborane with the 2D aromaticity of pyrazole. However, while the
Zahra Noori, Miquel Solà, Clara Viñas, Francesc Teixidor, Jordi Poater   +4 more
doaj   +1 more source

Impacto da queima nos atributos químicos e na composição química da matéria orgânica do solo e na vegetação Impact of burning on soil chemical attributes and organic matter composition and on vegetation

Pesquisa Agropecuária Brasileira, 2008
O objetivo deste trabalho foi avaliar o efeito residual de queimadas periódicas nos atributos químicos, teor e composição da matéria orgânica de um Latossolo Vermelho e na composição química da vegetação predominante.
Deborah Pinheiro Dick, Rosane Martinazzo, Ricardo Simão Diniz Dalmolin, Aino Victor Ávila Jacques, João Mielniczuk, Alessandro Samuel Rosa   +5 more
doaj   +1 more source

Evolution in the structural and bonding properties of Aluminum-Lithium clusters

, 2003
We present a systematic study of the geometries, energetics, electronic structure and bonding in various Al-Li clusters viz. AlnLin ($n$=1-11), Al$_2^-$, Al$_2^{2-}$, Al$_2$Li, Al$_2$Li$^-$, and Al6Li8 using Born-Oppenheimer molecular dynamics within the
Chacko, S., Kanhere, D. G., Paranjape, V. V.   +2 more
core   +1 more source

The aromatic fluctuation index (FLU): a new aromaticity index based on electron delocalization [PDF]

, 2005
In this work, the aromatic fluctuation index (FLU) that describes the fluctuation of electronic charge between adjacent atoms in a given ring is introduced as a new aromaticity measure.
Duran i Portas, Miquel, Matito i Gras, Eduard, Solà i Puig, Miquel   +2 more
core   +2 more sources

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Differences in Mineral Phase Associated Soil Organic Matter Composition due to Varying Tillage Intensity

Agronomy, 2019
The volume of soil organic matter (SOM) changes, owing to variations in tillage systems. Conservation tillage (CT) is a useful method for recovering the SOM content of crop fields.
Gergely Jakab, Tibor Filep, Csilla Király, Balázs Madarász, Dóra Zacháry, Marianna Ringer, Anna Vancsik, Lilla Gáspár, Zoltán Szalai   +8 more
doaj   +1 more source

Raman‐based label‐free microscopic analysis of the pancreas in living zebrafish larvae

FEBS Open Bio, EarlyView.
Forward stimulated Raman scattering (F‐SRS) and epi coherent anti‐Stokes Raman scattering (E‐CARS) allow label‐free discrimination of distinct subcellular structures in the pancreas of living zebrafish larvae. Given the straightforward applicability, we anticipate broad implementation of Raman microscopy in other organs and across various biomedical ...
Noura Faraj, Eline M. F. de Lange, Klaas A. Sjollema, Ben N. G. Giepmans   +3 more
wiley   +1 more source

Quantum walks in polycyclic aromatic hydrocarbons

New Journal of Physics, 2021
Aromaticity is a well-known phenomenon in both physics and chemistry, and is responsible for many unique chemical and physical properties of aromatic molecules.
Prateek Chawla, C. M. Chandrashekar
doaj   +1 more source