Results 31 to 40 of about 25,956 (178)

Iron Catalyzed Aryl–Aryl Kumada Cross‐Coupling: A Mechanistic and Computational Investigation

Angewandte Chemie, EarlyView.
Despite intense interest, the mechanism of iron‐catalyzed aryl–aryl cross‐coupling remains poorly understood. Combining Mössbauer spectroscopy, kinetics analysis, and DFT computations these studies reveal a novel Fe(I)/Fe(II)/Fe(III) catalytic for aryl–aryl cross‐coupling mediated by an Fe(II) PCNHCP Pincer complex. These findings close a key knowledge
Jatin Panda, Magali Gimeno, Amrita Gogoi, Zeqing Chen, Subhash Garhwal, Laura Levy, Alexander Kaushansky, Natalia Fridman, Jos Briggs‐Pritchard, Renana Gershoni‐Poranne, Michael L. Neidig, Graham de Ruiter   +11 more
wiley   +2 more sources

Ecological speciation in tropical reef fishes [PDF]

Proceedings of the Royal Society B: Biological Sciences, 2005
The high biodiversity in tropical seas provides a long-standing challenge to allopatric speciation models. Physical barriers are few in the ocean and larval dispersal is often extensive, a combination that should reduce opportunities for speciation.
Rocha, Luiz A., Robertson, D. Ross, Roman, Joe, Bowen, Brian W.   +3 more
openaire   +2 more sources

How common is ecological speciation in plant-feeding insects? A 'Higher' Nematinae perspective

BMC Evolutionary Biology, 2010
Background Ecological speciation is a process in which a transiently resource-polymorphic species divides into two specialized sister lineages as a result of divergent selection pressures caused by the use of multiple niches or environments.
Nyman Tommi, Vikberg Veli, Smith David R, Boevé Jean-Luc   +3 more
doaj   +1 more source

Does speciation between Arabidopsis halleri and Arabidopsis lyrata coincide with major changes in a molecular target of adaptation? [PDF]

PLoS ONE, 2011
Ever since Darwin proposed natural selection as the driving force for the origin of species, the role of adaptive processes in speciation has remained controversial.
Camille Roux, Vincent Castric, Maxime Pauwels, Stephen I Wright, Pierre Saumitou-Laprade, Xavier Vekemans   +5 more
doaj   +1 more source

How Facilitation May Interfere with Ecological Speciation [PDF]

International Journal of Ecology, 2012
Compared to the vast literature linking competitive interactions and speciation, attempts to understand the role of facilitation for evolutionary diversification remain scarce. Yet, community ecologists now recognize the importance of positive interactions within plant communities.
Liancourt, P., Choler, P., Gross, Nicolas, Thibert-Plante, X., Tielbörger, K.   +4 more
openaire   +4 more sources

Adult Sex Ratio as a Demographic Feedback Linking Mating Systems, Parental Care, and Evolution

Advanced Science, EarlyView.
Breeding systems are some of the most diverse social behavior, and our team is investigation the evolutionary causes of this diversity. This review summarises our research carried out at the University of Bath. We argue that demographic components of wild populations, especially the adult sex ratio, plays a key role driving breeding system variation ...
Tamás Székely, Oscar G. Miranda
wiley   +1 more source

Microevolutionary processes impact macroevolutionary patterns

BMC Evolutionary Biology, 2018
Background Macroevolutionary modeling of species diversification plays important roles in inferring large-scale biodiversity patterns. It allows estimation of speciation and extinction rates and statistically testing their relationships with different ...
Jingchun Li, Jen-Pen Huang, Jeet Sukumaran, L. Lacey Knowles   +3 more
doaj   +1 more source

How Likely Is Speciation in Neutral Ecology? [PDF]

The American Naturalist, 2012
The American Naturalist, Vol. 179, No. 1 (January 2012), pp. 137-144. DOI: 10.1086/663196. abstract: Patterns of biodiversity predicted by the neutral theory rely on a simple phenomenological model of speciation. To further investigate the effect of speciation on neutral biodiversity, we analyze a spatially explicit neutral model based on population ...
Desjardins-Proulx, Philippe, Gravel, Dominique   +1 more
openaire   +3 more sources

Enhanced Thermodynamic Stability of UO22+ Complex Through Structure Preorganization of N3O2‐Pentadentate Planar Ligand for Uranium Harvesting from Seawater

Advanced Science, EarlyView.
Thanks to the appropriate structure preorganization of an N3O2‐pentadentate planar ligand, 2,6‐bis(2‐hydroxyphenylmethylaminomethyl)pyridine (H2saldamp) exhibits the strongest coordination affinity to UO22+ (log βU = 33.60) compared to ligands developed for uranium harvesting from seawater to date, as well as good separability of UO22+ from other metal
Ryuto Nabata, Satoru Tsushima, Koichiro Takao   +2 more
wiley   +1 more source

Speciation environments and centres of diversity in southern Africa. I. Conceptual framework

Bothalia: African Biodiversity & Conservation, 1982
A knowledge of the nature and distribution of the environments where speciation (micro-evolution) is or has been rapid would help explain plant distributions and give insight into the mechanisms of plant evolution.
E. R. Robinson, G. E. Gibbs Russell
doaj   +1 more source