Results 71 to 80 of about 230,941 (392)

A functional nexus between photoperiod acclimation, torpor expression and somatic fatty acid composition in a heterothermic mammal. [PDF]

open access: yesPLoS ONE, 2013
The seasonal changes in thermal physiology and torpor expression of many heterothermic mammals are controlled by photoperiod. As function at low body temperatures during torpor requires changes of tissue lipid composition, we tested for the first time ...
Fritz Geiser   +2 more
doaj   +1 more source

Can the clocks tick together despite the noise? Stochastic simulations and analysis [PDF]

open access: yesarXiv, 2022
The suprachiasmatic nucleus (SCN), also known as the circadian master clock, consists of a large population of oscillator neurons. Together, these neurons produce a coherent signal that drives the body's circadian rhythms. What properties of the cell-to-cell communication allow the synchronization of these neurons, despite a wide range of environmental
arxiv  

Photoperiodic Response of Abrostola asclepiadis (Lepidoptera: Noctuidae), a Candidate Biological Control Agent for Swallow-worts (Vincetoxicum, Apocynaceae) [PDF]

open access: yes, 2020
A biological control program is in development for two swallow-wort species (Vincetoxicum, Apocynaceae), European vines introduced into northeastern North America.
Biazzo, Jeromy   +4 more
core   +2 more sources

Allelic variation of vernalization and photoperiod response genes in a diverse set of North American high latitude winter wheat genotypes

open access: yesPLoS ONE, 2018
The major physiological determinants of wheat (Triticum aestivum L.) phenology in a given area are a response to vernalization temperature and day length, which are at least in part, regulated by the allelic variation at the vernalization (VRN) and ...
Alexander Whittal   +4 more
semanticscholar   +1 more source

Cowpea leaf width correlates with above ground biomass across diverse environments

open access: yesLegume Science, Volume 4, Issue 4, December 2022., 2022
Abstract Cowpea (Vigna unguiculata [L.] Walp.) yields within the dry savannahs of Sub‐Saharan Africa are low. Given the contribution of cowpea to food security in this region, it is essential that high‐yielding varieties are developed to improve crop productivity in a sustainable manner.
Anthony Digrado   +8 more
wiley   +1 more source

Effects of Photoperiod and Temperature on Energy Budgets and Endocrine Hormones Concentrations in Tupaia belangeri [PDF]

open access: yesJournal of Stress Physiology & Biochemistry, 2014
Environmental cues play important roles in the regulation of an animal’s physiology and behavior. In the present study, we performed a factorial experiment (temperature/photoperiod) in which Tupaia belangeri was acclimated to different photoperiods (long
Wan-long Zhu   +3 more
doaj  

Temperature and photoperiod changes affect cucumber sex expression by different epigenetic regulations

open access: yesBMC Plant Biology, 2018
Cucumbers (Cucumis sativus) are known for their plasticity in sex expression. DNA methylation status determines gene activity but is susceptible to environmental condition changes.
Y. Lai   +11 more
semanticscholar   +1 more source

From minute to day: Ecophysiological response of phytoplankton to fluctuating light exposure during vertical mixing

open access: yesLimnology and Oceanography, Volume 67, Issue 12, Page 2809-2820, December 2022., 2022
Abstract Underwater light is a highly dynamic resource for phytoplankton. Fluctuating light influences photosynthesis, respiration, biosynthesis, and growth at different timescales, but the interplay of these processes is not well‐understood. Subsamples of a phytoplankton community from the turbid, well‐mixed lake TaiHu (China) were either vertically ...
Alexis Lucas Norbert Guislain   +1 more
wiley   +1 more source

Photoperiod and Melatonin Supplementation: Variable Effects on the Quality of Chilled Dog Semen

open access: yesFrontiers in Veterinary Science, 2022
The addition of melatonin in seminal extenders due to its antioxidant properties and its beneficial role in sperm preservation has been previously described, especially in seasonal species.
Olga Mitjana   +7 more
doaj   +1 more source

Production of polyhydroxybutyrates and carbohydrates in a mixed cyanobacterial culture: effect of nutrients limitation and photoperiods [PDF]

open access: yes, 2018
In the present study, different photoperiods and nutritional conditions were applied to a mixed wastewater-borne cyanobacterial culture in order to enhance the intracellular accumulation of polyhydroxybutyrates (PHBs) and carbohydrates. Two different experimental set-ups were used.
arxiv   +1 more source

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