Results 71 to 80 of about 1,324,164 (376)

Collisional losses, decoherence, and frequency shifts in optical lattice clocks with bosons

, 2009
We have quantified collisional losses, decoherence and the collision shift in a one-dimensional optical lattice clock with bosonic 88Sr. The lattice clock is referenced to the highly forbidden transition 1S0 - 3P0 at 698 nm, which becomes weakly allowed ...
Lisdat, Ch., Middelmann, T., Riehle, F., Sterr, U., Winfred, J. S. R. Vellore   +4 more
core   +1 more source

occumb: An R package for site occupancy modeling of eDNA metabarcoding data

Population Ecology, EarlyView.
This study introduces a new R package, occumb, for the convenient application of site occupancy modeling using environmental DNA (eDNA) metabarcoding data. We outline a data analysis workflow, including data setup, model fitting, model assessment, and comparison of potential study settings based on model predictions, all of which can be performed using
Keiichi Fukaya, Yuta Hasebe
wiley   +1 more source

Compensation Method for Sensor Network Clock Error Based on Cyclic Symmetry Algorithm

Sensors, 2020
Since the existing methods cannot evaluate the time delay of different layers of sensor networks, there are some problems such as the low precision of clock error compensation, high time delay, and low efficiency of communication in sensor networks.
Hailiang Feng, Zhanxin Yang, Yuhai Shi, Narjes Nabipour   +3 more
doaj   +1 more source

Circadian Clock Genes and the Transcriptional Architecture of the Clock Mechanism.

Journal of Molecular Endocrinology, 2018
The mammalian circadian clock has evolved as an adaptation to the 24-hour light/dark cycle on earth. Maintaining cellular activities in synchrony with the activities of the organism (such as eating and sleeping) helps different tissue and organ systems ...
K. H. Cox, J. Takahashi
semanticscholar   +1 more source

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

Differential Effect of Fructose in the Presence or Absence of Fatty Acids on Circadian Metabolism in Hepatocytes

Metabolites, 2023
We aimed to explore whether fructose in the absence or presence of fatty acids modulates circadian metabolism in AML-12 hepatocytes. Fructose treatment under steatosis conditions (FruFA) led to fat synthesis resulting in increased triglycerides and ...
Shani Tsameret, Nava Chapnik, Oren Froy
doaj   +1 more source

A transportable strontium optical lattice clock [PDF]

, 2014
We report on a transportable optical clock, based on laser-cooled strontium atoms trapped in an optical lattice. The experimental apparatus is composed of a compact source of ultra-cold strontium atoms including a compact cooling laser set-up and a ...
Falke, St., Lisdat, Ch., Poli, N., Schioppo, M., Sterr, U., Tino, G. M., Vogt, S.   +6 more
core   +1 more source

Circadian clock protein BMAL1 regulates IL-1β in macrophages via NRF2

Proceedings of the National Academy of Sciences of the United States of America, 2018
Significance The molecular clock provides an anticipatory mechanism, allowing organisms to prepare and respond to daily changes in the external environment.
James O. Early, Deepthi Menon, C. Wyse, Mariana P. Cervantes-Silva, Z. Zaslona, R. Carroll, E. Palsson-McDermott, Stefano Angiari, D. Ryan, Sarah E. Corcoran, George A. Timmons, S. Geiger, Darren J. Fitzpatrick, Daniel J. O'Connell, R. Xavier, K. Hokamp, L. O’Neill, Annie M. Curtis   +17 more
semanticscholar   +1 more source

Ultrastable optical clock with two cold-atom ensembles [PDF]

Nature Photonics, 2016
Optical clocks with a record low zero-dead-time instability of 6 × 10–17 at 1 second are demonstrated in two cold-ytterbium systems. The two systems are interrogated by a shared optical local oscillator to nearly eliminate the Dick effect.
M. Schioppo, M. Schioppo, M. Schioppo, Roger Brown, W. McGrew, W. McGrew, N. Hinkley, N. Hinkley, R. Fasano, R. Fasano, K. Beloy, T. Yoon, T. Yoon, G. Milani, G. Milani, D. Nicolodi, J. Sherman, N. Phillips, C. Oates, A. Ludlow   +19 more
semanticscholar   +1 more source

Moving in the Dark: Enlightening the Spatial Population Ecology of European Cave Salamanders

Population Ecology, EarlyView.
We assessed individual interactions, movement ecology and activity patterns of a subterranean population of Speleomantes strinatii, applying spatial capture–recapture modeling to a photographic dataset of 104 individuals. ABSTRACT Space use and movement are fundamental aspects of organisms' ecology, mirroring individual fitness, behavior, and life ...
Giacomo Rosa, Andrea Costa, Sebastiano Salvidio   +2 more
wiley   +1 more source