Results 321 to 330 of about 4,369,569 (381)

High‐Performance Polymeric Materials through Hydrogen‐Bond Cross‐Linking

Advances in Materials, 2019
It has always been critical to develop high‐performance polymeric materials with exceptional mechanical strength and toughness, thermal stability, and even healable properties for meeting performance requirements in industry.
Pingan Song, Hao Wang
semanticscholar   +1 more source

The structural basis of ribosome activity in peptide bond synthesis.

Science, 2000
Using the atomic structures of the large ribosomal subunit from Haloarcula marismortui and its complexes with two substrate analogs, we establish that the ribosome is a ribozyme and address the catalytic properties of its all-RNA active site.
P. Nissen, Jeffrey Hansen, N. Ban, P. Moore, T. Steitz   +4 more
semanticscholar   +1 more source

Bond, D-Bond

2015
Bund und Lander gehen kunftig „huckepack“ und begeben, so der Plan, 2013 eine erste gemeinsame Anleihe, den so genannten Deutschland-Bond. Das gleicht einer kleinen Revolution, wurde doch in der Vergangenheit ein solches Ansinnen immer wieder abgelehnt. „Intelligentes Schuldenmanagement“ nennt das Bundesfinanzministerium seinen neuen Standpunkt.
Stefanie Hüthig, Stefanie Burgmaier
openaire   +2 more sources

Bond length and bond multiplicity: σ-bond prevents short π-bonds

Chem. Commun., 2006
Analysis of model compounds such as Fe2(CO)6, C2 and HBBH shows that pi-bonds left to themselves are shorter than sigma-bonds; in many ways sigma-bonds prevent pi-bonds from adopting their optimal shorter distances.
Henry F. Schaefer, Biswarup Pathak, Biswarup Pathak, Eluvathingal D. Jemmis, Eluvathingal D. Jemmis, R. Bruce King   +5 more
openaire   +2 more sources

Aryl-aryl bond formation by transition-metal-catalyzed direct arylation.

Chemical Reviews, 2007
The biaryl structural motif is a predominant feature in many pharmaceutically relevant and biologically active compounds. As a result, for over a century 1 organic chemists have sought to develop new and more efficient aryl -aryl bond-forming methods ...
Dino Alberico, Mark E. Scott, M. Lautens
semanticscholar   +1 more source

Chalcogen Bond: A Sister Noncovalent Bond to Halogen Bond

The Journal of Physical Chemistry A, 2009
A sister noncovalent bond to halogen bond, termed chalcogen bond, is defined in this article. By selecting the complexes H(2)CS...Cl(-), F(2)CS...Cl(-), OCS...Cl(-), and SCS...Cl(-) as models, the bond-length change, interaction energy, topological property of the electron charge density and its Laplacian, and the charge transfer of the chalcogen bond ...
Baoming Ji, Weizhou Wang, Yu Zhang
openaire   +3 more sources

To Bond or Not to Bond? That is the Question

Journal of Cases in Educational Leadership, 2015
This case, inspired by a real school district scenario, was developed for use in a graduate-level course in school finance. James Spencer had just been selected as the new superintendent of a low-income, 400-student, rural school district in need of many capital improvements.
openaire   +2 more sources

Iron-Catalyzed C-H Bond Activation.

Chemical Reviews, 2017
Catalytic C-H bond activation, which was an elusive subject of chemical research until the 1990s, has now become a standard synthetic method for the formation of new C-C and C-heteroatom bonds.
R. Shang, L. Ilies, E. Nakamura
semanticscholar   +1 more source

Accurate Bond and Angle Parameters for X-ray Protein Structure Refinement

, 1991
Bond-length and bond-angle parameters are derived from a statistical survey of X-ray structures of small compounds from the Cambridge Structural Database.
R. Engh, R. Huber
semanticscholar   +1 more source

C-H bond functionalization: emerging synthetic tools for natural products and pharmaceuticals.

Angewandte Chemie, 2012
The direct functionalization of C-H bonds in organic compounds has recently emerged as a powerful and ideal method for the formation of carbon-carbon and carbon-heteroatom bonds.
Junichiro Yamaguchi, A. Yamaguchi, K. Itami   +2 more
semanticscholar   +1 more source