Photoperiod
Research News and Information

Sunday, November 22, 2009

Interactions between cognition and circadian rhythms: attentional demands modify circadian entrainment.

29 Sep 2009 Animals and humans are able to predict and synchronize their daily activity to signals present in their environments. Environmental cues are most often associated with signaling the beginning or the end of a daily activity cycle, but they can also ... Read more...

Transcriptomic and proteomic analyses of seasonal photoperiodism in the pea aphid.

27 Sep 2009 BACKGROUND: Aphid adaptation to harsh winter conditions is illustrated by an alternation of their reproductive mode. Aphids detect photoperiod shortening by sensing the length of the night and switch from viviparous parthenogenesis in spring and ... Read more...

Identification of flowering genes in strawberry, a perennial SD plant.

26 Sep 2009 BACKGROUND: We are studying the regulation of flowering in perennial plants by using diploid wild strawberry (Fragaria vesca L.) as a model. Wild strawberry is a facultative short-day plant with an obligatory short-day requirement at temperatures ... Read more...

Latest indexed articles for 'Photoperiod'

These are the very latest articles for this heading:

• Interactions between cognition and circadian rhythms: attentional demands modify circadian entrainment. 29 Sep 2009
• Transcriptomic and proteomic analyses of seasonal photoperiodism in the pea aphid. 27 Sep 2009
• Identification of flowering genes in strawberry, a perennial SD plant. 26 Sep 2009
• Evaluation of plasma ACTH, alpha-melanocyte-stimulating hormone, and insulin concentrations during various photoperiods in clinically normal horses and ponies and those with pituitary pars intermedia dysfunction. 13 Sep 2009
• Graft-transmissible induction of potato tuberization by the microRNA miR172. 30 Aug 2009
• Temporal patterns of lipoperoxidation and antioxidant enzymes are modified in the hippocampus of vitamin A-deficient rats. 30 Aug 2009
• OsEF3, a homologous gene of Arabidopsis ELF3, has pleiotropic effects in rice. 30 Aug 2009
• Circadian rhythms of extracellular ATP accumulation in suprachiasmatic nucleus cells and cultured astrocytes. 25 Aug 2009
• Environmental control of ovarian dormancy in natural populations of Drosophila melanogaster. 7 Aug 2009
• Premature tapetum degeneration: a major cause of abortive pollen development in photoperiod sensitive genic male sterility in rice. 30 Jul 2009
• Response to noise from modern wind farms in The Netherlands. 30 Jul 2009
• Seasonal pelage changes are synchronized by simulated natural photoperiods in Siberian hamsters (Phodopus sungorus). 30 Jul 2009
• Metabolic rhythms of the cyanobacterium Cyanothece sp. ATCC 51142 correlate with modeled dynamics of circadian clock. 30 Jul 2009
• Period gene expression in four neurons is sufficient for rhythmic activity of Drosophila melanogaster under dim light conditions. 30 Jul 2009
• Does the morning and evening oscillator model fit better for flies or mice? 30 Jul 2009
• Dietary palmitate and linoleate oxidations, oxidative stress, and DNA damage differ according to season in mouse lemurs exposed to a chronic food deprivation. 20 Jul 2009
• The neuropeptide PDF acts directly on evening pacemaker neurons to regulate multiple features of circadian behavior. 19 Jul 2009
• Computational analysis of flowering in pea (Pisum sativum). 18 Jul 2009
• Regular exercise attenuates the metabolic drive to regain weight after long-term weight loss. 6 Jul 2009
• Repression of flowering by the miR172 target SMZ. 5 Jul 2009

See a longer list of these articles.

Technical information about 'Photoperiod'

Definition: The time period of daily exposure that an organism receives from daylight or artificial light. It is believed that photoperiodic responses may affect the control of energy balance and thermoregulation.

Descriptor UI: D017440

Alternative terms: Photoperiod; Photoperiods;

Tree Number: G01.910.675;

History Note: 93

Technical Notes: "photo-" refers to natural or artificial light; no qualif