Results 81 to 90 of about 3,059,060 (366)

Field weed population models: a review of approaches and application domains [PDF]

, 2005
We evaluated models of weed population dynamics based on an analysis of their assumptions, biological rationale, flexibility, documentation, accessibility, demand for parameter estimation and documented validity.
Bastiaans, L., Holst, N., Rasmussen, I.A.   +2 more
core   +1 more source

By dawn or dusk—how circadian timing rewrites bacterial infection outcomes

FEBS Letters, EarlyView.
The circadian clock shapes immune function, yet its influence on infection outcomes is only beginning to be understood. This review highlights how circadian timing alters host responses to the bacterial pathogens Salmonella enterica, Listeria monocytogenes, and Streptococcus pneumoniae revealing that the effectiveness of immune defense depends not only
Devons Mo, Catherine S. Palmer, Jacqueline M. Kimmey   +2 more
wiley   +1 more source

Real‐time assay of ribonucleotide reductase activity with a fluorescent RNA aptamer

FEBS Letters, EarlyView.
Ribonucleotide reductases (RNR) synthesize DNA building blocks de novo, making them crucial in DNA replication and drug targeting. FLARE introduces the first single‐tube real‐time coupled RNR assay, which enables isothermal tracking of RNR activity at nanomolar enzyme levels and allows the reconstruction of allosteric regulatory patterns and rapid ...
Jacopo De Capitani, Noemi E. Nwosu, Viktoria Gocke, Müge Kasanmascheff, Hannes Mutschler   +4 more
wiley   +1 more source

Density-Dependence as a Size-Independent Regulatory Mechanism

, 2005
The growth function of populations is central in biomathematics. The main dogma is the existence of density dependence mechanisms, which can be modelled with distinct functional forms that depend on the size of the population.
Allee, Arrowsmith, Ayala, Brown, Calder, Day, de Vladar, Diserud, Fisher, Gardner, Gilpin, Gilpin, Gompertz, González, González, Hamilton, Hamilton, Hanski, Harold P. de Vladar, Hart, Henle, Hershey, Kadanoff, Kozlowski, Kozusko, MacArthur, May, Molski, Norton, Norton, Pearl, Roff, Saether, Saether, Saether, Stearns, Szathmary, Verhulst, von Bertalanffy, von Bertalanffy, West, West, Wheldon   +42 more
core   +2 more sources

Dressed-State Approach to Population Trapping in the Jaynes-Cummings Model [PDF]

, 1999
The phenomenon of atomic population trapping in the Jaynes-Cummings Model is analysed from a dressed-state point of view. A general condition for the occurrence of partial or total trapping from an arbitrary, pure initial atom-field state is obtained in ...
A Vidiella-Barranco, Courant R., D. Jonathan, Gradsteyn I. S., Haroche S., Jonathan D., K. Furuya, Meystre P., Susskind L.   +8 more
core   +2 more sources

Non-linear analysis indicates chaotic dynamics and reduced resilience in model-based Daphnia populations exposed to environmental stress. [PDF]

PLoS ONE, 2014
In this study we present evidence that anthropogenic stressors can reduce the resilience of age-structured populations. Enhancement of disturbance in a model-based Daphnia population lead to a repression of chaotic population dynamics at the same time ...
Richard Ottermanns, Kerstin Szonn, Thomas G Preuβ, Martina Roβ-Nickoll   +3 more
doaj   +1 more source

Disordered but rhythmic—the role of intrinsic protein disorder in eukaryotic circadian timing

FEBS Letters, EarlyView.
Unstructured domains known as intrinsically disordered regions (IDRs) are present in nearly every part of the eukaryotic core circadian oscillator. IDRs enable many diverse inter‐ and intramolecular interactions that support clock function. IDR conformations are highly tunable by post‐translational modifications and environmental conditions, which ...
Emery T. Usher, Jacqueline F. Pelham
wiley   +1 more source

Threshold dynamics of a stochastic SIHR epidemic model of COVID-19 with general population-size dependent contact rate

Mathematical Biosciences and Engineering, 2022
In this paper, we propose a stochastic SIHR epidemic model of COVID-19. A basic reproduction number $ R_{0}^{s} $ is defined to determine the extinction or persistence of the disease. If $ R_{0}^{s} < 1 $, the disease will be extinct.
Tianfang Hou, Guijie Lan , Sanling Yuan , Tonghua Zhang   +3 more
doaj   +1 more source

Abstraction of Markov Population Dynamics via Generative Adversarial Nets

, 2021
Markov Population Models are a widespread formalism used to model the dynamics of complex systems, with applications in Systems Biology and many other fields. The associated Markov stochastic process in continuous time is often analyzed by simulation, which can be costly for large or stiff systems, particularly when a massive number of simulations has ...
Cairoli F., Carbone G., Bortolussi L.
openaire   +3 more sources

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