Results 61 to 70 of about 1,619 (156)

Foveal Cone Spacing and Cone Photopigment Density Difference: Objective Measurements in the Same Subjects

open access: yes, 1997
7 pages, 6 figures.-- PMID: 9274776 [PubMed].Foveal cone spacing was measured in vivo using an objective technique: ocular speckle interferometry. Cone packing density was computed from cone spacing data.
Marcos, Susana   +7 more
core   +1 more source

Impact of Human Melanopsin Gene (OPN4) Polymorphisms (I394T, P10L) on Nocturnal Melatonin and Daily Rhythms in Young Adults

open access: yesJournal of Pineal Research, Volume 78, Issue 5, September 2026.
ABSTRACT The present study investigates the impact of two missense SNPs in the human melanopsin gene OPN4 ‐I394T (rs1079610) and P10L (rs2675703)‐ on non‐image‐forming (NIF) physiological and behavioural outputs in healthy young adults under real‐world conditions.
Jesús Vicente‐Martínez   +5 more
wiley   +1 more source

Light does not phase shift the circadian clock of subcutaneous adipose tissue in vitro

open access: yesnpj Biological Timing and Sleep
The retinal photopigment melanopsin is also expressed in subcutaneous white adipose tissue (scWAT). Through melanopsin, light can modulate scWAT metabolism, but its impact on circadian phase is unclear.
Anna Edmondson   +2 more
doaj   +1 more source

Dinoflagellate responses to nutrients and mangrove leaf organic matter in the bioluminescent Mangrove Lagoon, St. Croix, U.S. Virgin Islands

open access: yesJournal of Phycology, Volume 62, Issue 4, Page 1240-1250, August 2026.
Abstract Bioluminescent bays (biobays) are uncommon coastal ecosystems featuring dense populations of dinoflagellates, often found in mangrove‐ringed lagoons with long water retention times and high organic matter (OM) levels. Although mangroves are associated with high dinoflagellate abundance, it remains uncertain how inorganic nutrients compare with
James L. Pinckney   +2 more
wiley   +1 more source

Key considerations for the use of satellite‐based remote sensing for lake and reservoir research and management

open access: yesEcosphere, Volume 17, Issue 7, July 2026.
Abstract Given the critical importance of freshwater for human well‐being and the myriad threats altering water quality and quantity, monitoring lakes and reservoirs is necessary to identify where, how, and why freshwater ecosystems are changing globally.
J. V. Trout‐Haney   +11 more
wiley   +1 more source

Retention of the Full Visual Opsin Repertoire in Some Australian Cryptozoic Lizards

open access: yesEcology and Evolution, Volume 16, Issue 6, June 2026.
This study investigates the link between visual evolution and fossorial habits in the endemic Australian skink genus Lerista. We provide evidence for positive site‐specific selection in all 4 cone opsins, as well as relaxed selection specific to LWS. We also provide evidence of selection linked to limb reduction, an indicator of fossorial adaptation ...
Matthew J. R. Ford   +5 more
wiley   +1 more source

G-Protein Coupled Receptor Kinase 2 Minimally Regulates Melanopsin Activity in Intrinsically Photosensitive Retinal Ganglion Cells.

open access: yesPLoS ONE, 2015
Phosphorylation is a primary modulator of mammalian G-protein coupled receptor (GPCR) activity. The GPCR melanopsin is the photopigment of intrinsically photosensitive retinal ganglion cells (ipRGCs) in the mammalian retina. Recent evidence from in vitro
Timothy J Sexton, Russell N Van Gelder
doaj   +1 more source

A flexible arched artificial photoreceptor constructed by photodeformable liquid crystal polymers and its application in vision restoration

open access: yesSmart Molecules, Volume 4, Issue 2, June 2026.
A flexible arched artificial photoreceptor with high stability and biocompatibility was fabricated by integrating liquid crystal polymers with polyvinylidene fluoride‐trifluoroethylene. This device exhibits robust photoelectric responses under low‐intensity illumination and demonstrates efficacy in restoring visual responses in blind rats following ...
Yumeng Jiang   +7 more
wiley   +1 more source

Linear Dichroism and Orientation of the Phycomyces Photopigment [PDF]

open access: yesThe Journal of General Physiology, 1974
The greater sensitivity of a cylindrical Phycomyces sporangiophore to blue light polarized transversely rather than longitudinally is a consequence of the dichroism and orientation of the receptor pigment. The abilities of wild type and several carotene mutants to distinguish between the two directions of polarization are the same.
openaire   +3 more sources

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