Results 71 to 80 of about 1,050,756 (279)

Between Droughts and Floods: The Seasonal Response of Freshwater Snails in Artificial Reservoirs in the Brazilian Semiarid Region

Population Ecology, EarlyView.
We investigate the seasonal dynamics of two freshwater snails, Biomphalaria straminea and Melanoides tuberculata, in artificial reservoirs of the Brazilian semiarid region. Despite regulated hydrology, B. straminea exhibited strong seasonal fluctuations associated with dry periods, while M. tuberculata maintained stable populations throughout the year,
Lucas Henrique Sousa da Silva, João Hemerson de Sousa, Adriana Josefa da Rocha, Manuella Feitosa Leal, Lucas Ariel de Sousa Aguiar, Tamaris Gimenez Pinheiro, Edson Lourenço da Silva   +6 more
wiley   +1 more source

Engineering clostridium strain to accept unmethylated DNA. [PDF]

PLoS ONE, 2010
It is difficult to genetically manipulate the medically and biotechnologically important genus Clostridium due to the existence of the restriction and modification (RM) systems. We identified and engineered the RM system of a model clostridial species, C.
Hongjun Dong, Yanping Zhang, Zongjie Dai, Yin Li   +3 more
doaj   +1 more source

Infection Models for Pine Wilt Disease on the Basis of Vector Behaviors

Population Ecology, EarlyView.
Infection models for pine wilt disease without vector density were built to estimate the transmission coefficient of the pathogenic nematode. The models successfully simulated the annual change in the density of infected trees for four pine stands. ABSTRACT Pine wilt disease is caused by the pinewood nematode (Bursaphelenchus xylophilus Steiner et ...
Katsumi Togashi
wiley   +1 more source

Supersymmetrization of horizontality condition: nilpotent symmetries for a free spinning relativistic particle

, 2012
We derive the off-shell nilpotent and absolutely anticommuting Becchi-Rouet-Stora-Tyutin (BRST) and anti-BRST symmetry transformations for a supersymmetric system of a free spinning relativistic particle within the framework of superfield approach to ...
A. Shukla, D. Namschansky, G. Curci, J. Thierry-Mieg, J. Thierry-Mieg, K. Sundermeyer, L. Bonora, L. Bonora, L. Bonora, L. Bonora, M. Quiros, P.A.M. Dirac, R. Delbourgo, R. Delbourgo, R. P. Malik, R.P. Malik, R.P. Malik, R.P. Malik, R.P. Malik, S. Krishna   +19 more
core   +1 more source

Is General Relativity a simpler theory? [PDF]

, 2012
Gravity is understood as a geometrization of spacetime. But spacetime is also the manifold of the boundary values of the spinless point particle in a variational approach. Since all known matter, baryons, leptons and gauge bosons are spinning objects, it
Martín Rivas, Rivas M, Rivas M, Rund H
core   +2 more sources

An Adaptive Management Model for Brown Bears in Hokkaido: Based on Total Population and the Number of Nuisance Bears

Population Ecology, EarlyView.
Bear management changes management actions according to the horizontal axis of the population size and the vertical axis of the number of nuisance bears. Aiming for the target population size of Ntar, Actions I and II protect the bears, and Action IV reduces the population.
Hiroyuki Matsuda, Akira Maki, Tsutomu Mano, Hifumi Tsuruga, Hino Takafumi, Shinichi Horino   +5 more
wiley   +1 more source

Gene doctoring: a method for recombineering in laboratory and pathogenic Escherichia coli strains [PDF]

, 2009
Background: Homologous recombination mediated by the lambda-Red genes is a common method for making chromosomal modifications in Escherichia coli.
Bingle, Lewis EH, Busby, Stephen J. W., Heurlier, Karin, Hobman, Jon L, Lee, David J, Pallen, Mark J., Penn, Charles W   +6 more
core   +5 more sources

Dependence of post-segregational killing mediated by Type II restriction–modification systems on the lifetime of restriction endonuclease effective activity

mBio
Plasmid-borne Type II restriction–modification (RM) systems mediate post-segregational killing (PSK). PSK is thought to be caused by the dilution of restriction and modification enzymes during cell division, resulting in accumulation of unmethylated DNA ...
Svetlana Kozlova, Natalia Morozova, Yaroslav Ispolatov, Konstantin Severinov   +3 more
doaj   +1 more source

Speciation Through the Lens of Population Dynamics: A Theoretical Primer on How Small and Large Populations Diverge

Population Ecology, EarlyView.
Population size and dynamics fundamentally shape speciation by influencing genetic drift, founder events, and adaptive potential. Small populations may speciate rapidly due to stronger drift, whereas large populations harbor more genetic diversity, which can alter divergence trajectories. We highlight theoretical models that incorporate population size
Ryo Yamaguchi, Hidaka Kubo, Tokuya Ogawa, Hayate Omura   +3 more
wiley   +1 more source

Genomic mapping of phosphorothioates reveals partial modification of short consensus sequences [PDF]

, 2013
Bacterial phosphorothioate (PT) DNA modifications are incorporated by Dnd proteins A-E and often function with DndF-H as a restriction-modification (R-M) system, as in Escherichia coli B7A. However, bacteria such as Vibrio cyclitrophicus FF75 lack dndF-H,
Boitano, Matthew, Butty, Vincent, Cao, Bo, Chen, Chao, Chen, Shi, Cheng, Qiuxiang, Clark, Tyson A., Dedon, Peter C., DeMott, Michael S., Deng, Zixin, Korlach, Jonas, Levine, Stuart S., Luong, Khai, Song, Yi, Turner, Stephen W., Wang, Lianrong, Xiong, Xiaolin, You, Delin, Yuan, George, Zheng, Xiaoqing, Zhou, Xiufen   +20 more
core   +1 more source