Results 61 to 70 of about 5,195 (203)

BET & ELF Quantum Topological Analysis of Neutral 2-Aza-Cope Rearrangement of γ-Alkenyl Nitrones

Molecules, 2017
The 2-Aza-Cope rearrangement of γ-alkenyl nitrones is a rare example of the neutral thermal 2-aza-Cope process that usually takes place with cationic species.
Pedro Merino, Maria A. Chiacchio, Laura Legnani, Tomás Tejero   +3 more
doaj   +1 more source

Exploring Regio- and Stereoselectivity in [3+2] Cycloaddition: Molecular Electron Density Theory Approach for Novel Spirooxindole-Based Benzimidazole with Pyridine Spacer

Crystals, 2023
A new ethylene derivative was synthesized as a precursor for the [3+2] cycloaddition (32CA) reaction to access a novel spirooxindole embodied with benzimidazole with a pyridine spacer.
Saeed Alshahrani, Abdullah Mohammed Al-Majid, Abdullah Saleh Alamary, Mar Ríos-Gutiérrez, Assem Barakat   +4 more
doaj   +1 more source

On the Question of the Formation of Nitro-Functionalized 2,4-Pyrazole Analogs on the Basis of Nitrylimine Molecular Systems and 3,3,3-Trichloro-1-Nitroprop-1-Ene

Molecules, 2022
Experimental and theoretical studies on the reaction between (E)-3,3,3-trichloro-1-nitroprop-1-ene and N-(4-bromophenyl)-C-arylnitrylimine were performed.
Karolina Kula, Agnieszka Łapczuk, Mikołaj Sadowski, Jowita Kras, Karolina Zawadzińska, Oleg M. Demchuk, Gajendra Kumar Gaurav, Aneta Wróblewska, Radomir Jasiński   +8 more
doaj   +1 more source

V.I. Vernadsky and the noosphere concept: Russian understandings of society-nature interaction [PDF]

, 2006
Recent Russian legislative and policy documentation concerning national progress towards sustainable development has suggested that the attainment of such a state would represent the first stage in the development of the noosphere as outlined by the ...
Bailes, Clark, Crutzen, DeBardeleben, Denis J.B. Shaw, Dryzek, Eden, Foster, Gare, Glacken, Grinevald, Jonathan D. Oldfield, Kuznetsov, Lapenis, Lapo, Le Roy, Levit, Levit, Lovelock, Lovelock, Margulis, Margulis, Mattelart, Oldfield, Oldfield, Oldroyd, Parris, Simmons, Smil, Teilhard de Chardin, Teilhard de Chardin, Trusov, Vernadsky, Vernadsky, Vernadsky, Vernadsky, Vernadsky, Vernadsky, WCED, Westbroek, World Bank   +40 more
core   +1 more source

A Molecular Electron Density Theory Study of the Competitiveness of Polar Diels–Alder and Polar Alder-ene Reactions

Molecules, 2018
The competitiveness of the BF3 Lewis acid (LA) catalyzed polar Diels–Alder (P-DA) and polar Alder-ene (P-AE) reactions of 2-methyl-1,3-butadiene, a diene possessing an allylic hydrogen, with formaldehyde has been studied within the Molecular ...
Luis R. Domingo, Mar Ríos-Gutiérrez, Patricia Pérez   +2 more
doaj   +1 more source

Quarnet Inference Rules for Level-1 Networks [PDF]

, 2017
An important problem in phylogenetics is the construction of phylogenetic trees. One way to approach this problem, known as the supertree method, involves inferring a phylogenetic tree with leaves consisting of a set X of species from a collection of ...
A Dress, A Dress, C Semple, CA Meacham, Charles Semple, D Bryant, H Colonius, HJ Bandelt, HJ Bandelt, I Letunic, J Keijsper, Katharina T. Huber, KT Huber, KT Huber, KT Huber, M Steel, O Bininda-Emonds, P Gambette, S Grünewald, S Grünewald, Taoyang Wu, Vincent Moulton   +21 more
core   +3 more sources

Organ Transplantation from the Deceased [PDF]

, 1968
Loening in a Parks class filled with students.
Guttentag, Otto E.
core   +2 more sources

Characterization and Some Insights into the Reaction Chemistry of Polymethylsilsesquioxane or Methyl Silicone Resins

International Journal of Polymer Science, 2012
Structural characterization of a polymethylsilsesquioxane (PMSQ) and a DT-type methyl silicone resin (MeDT) has been carried out by various instrumental analyses including GPC, NMR, gas chromatography, and gas chromatography-mass spectrometry.
Maki Itoh, Fukuyo Oka, Michitaka Suto, Simon D. Cook, Norbert Auner   +4 more
doaj   +1 more source

Combinatorial properties of triplet covers for binary trees [PDF]

, 2017
It is a classical result that an unrooted tree $T$ having positive real-valued edge lengths and no vertices of degree two can be reconstructed from the induced distance between each pair of leaves.
Grunewald, Stefan, Huber, Katharina T., Moulton, Vincent, Steel, Mike   +3 more
core   +2 more sources

MFR‐UNet: A Medical Image Segmentation Network With Fused Multi‐Scale Feature Refinement

IET Systems Biology, Volume 20, Issue 1, January/December 2026.
Addressing the challenges of CNN‐based methods (especially U‐Net and its variants) in medical image segmentation—such as difficulties in capturing long‐range dependencies and insufficient refinement of multi‐scale features—this paper proposes the MFR‐UNet architecture integrated with a multi‐scale feature refinement mechanism, which enhances ...
Shaoqiang Wang, Guiling Shi, Shuo Sun, Yuchen Wang, Yulin Zhang, Weixian Li, Yawu Zhao, Xiaochun Cheng   +7 more
wiley   +1 more source