Results 81 to 90 of about 3,143,816 (338)

Front Propagation and Clustering in the Stochastic Nonlocal Fisher Equation

, 2017
The nonlocal Fisher equation is a diffusion-reaction equation with a nonlocal quadratic competition, which describes the reaction between distant individuals.
Ganan, Yehuda A., Kessler, David A.
core   +1 more source

Time after time – circadian clocks through the lens of oscillator theory

FEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo, Carolin Ector, Hanspeter Herzel   +2 more
wiley   +1 more source

Population, Population Density, and Technological Change [PDF]

In a model on population and endogenous technological change, Kremer combines a short-run Malthusian scenario where income determines the population that can be sustained, with the Boserupian insight that greater population spurs technological change and
Stephan Klasen, Thorsten Nestmann
core  

The newfound relationship between extrachromosomal DNAs and excised signal circles

FEBS Letters, EarlyView.
Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley   +1 more source

Effects of DNA Methylation of HPA-Axis Genes of F1 Juvenile Induced by Maternal Density Stress on Behavior and Immune Traits in Root Voles (Microtus oeconomus)—A Field Experiment

Animals
The literature shows that maternal stress can influence behavior and immune function in F1. Yet, most studies on these are from the laboratory, and replicated studies on the mechanisms by which maternal stress drives individual characteristics are still ...
Shouyang Du, Guozhen Shang, Xin Tian, Zihan Liu, Yanbin Yang, Hongxing Niu, Jianghui Bian, Yan Wu, Jinyou Ma   +8 more
doaj   +1 more source

Sequence determinants of RNA G‐quadruplex unfolding by Arg‐rich regions

FEBS Letters, EarlyView.
We show that Arg‐rich peptides selectively unfold RNA G‐quadruplexes, but not RNA stem‐loops or DNA/RNA duplexes. This length‐dependent activity is inhibited by acidic residues and is conserved among SR and SR‐related proteins (SRSF1, SRSF3, SRSF9, U1‐70K, and U2AF1).
Naiduwadura Ivon Upekala De Silva, Puspa Kunwar, Md Ibnul Rifat Rahman, Joanna Koryo Kwao, Nathan Lehman, Zihan Zhang, Trenton Paul, Claire Cheng, Nicholas Truex, Hui‐Ting Lee, Jun Zhang   +10 more
wiley   +1 more source

Co-evolution of density and topology in a simple model of city formation

, 2008
We study the influence that population density and the road network have on each others' growth and evolution. We use a simple model of formation and evolution of city roads which reproduces the most important empirical features of street networks in ...
A Bejan, A Cardillo, A Coniglio, A Maritan, A Runions, AC Goodman, AK Dixit, Alessandro Flammini, B Derrida, B Duplantier, B Jiang, C Itzykson, D Levinson, D Levinson, G Doyle, GB West, GT Toussaint, H Makse, HA Makse, I Rodriguez-Iturbe, J Buhl, JH Thünen von, JK Brueckner, JR Banavar, JR Banavar, JW Jaromczyk, K-I Goh, LAN Amaral, LC Freeman, LM Bettencourt, M Barthélemy, M Barthélemy, M Barthélemy, M Batty, M Fujita, M Schwartz, Marc Barthélemy, MT Gastner, MW Bern, ND Price, P Ball, P Crucitti, P Jensen, PS Stevens, RK Ahuja, RL Graham, S Gerke, S Lammer, S Porta, V Kalapala, W Christaller   +50 more
core   +2 more sources

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

Population Density

This chapter will review in detail the behavior of the population density in Mexico from 1990 to 2020. The Time Series Graph of this factor will be decom- ´ posed into the Trend T(t), Seasonal S(t), Cyclical C(t), and Irregular I(t) components. From the graphical results, we will analyze and obtain will get a method to calculate the population density ...
  +4 more sources

Anthropogenic induced changes in nesting densities of the dune-specialised digger wasp Bembix rostrata (Hymenoptera: Sphecidae)

European Journal of Entomology, 2005
Data on nesting densities of Bembix rostrata, a digger wasp inhabiting dynamic coastal dunes, were used to document the detrimental effects of trampling by cattle and vacationers.
Dries BONTE
doaj   +1 more source