Results 11 to 20 of about 498,360 (318)

Retinal Vibrations in Bacteriorhodopsin are Mechanically Harmonic but Electrically Anharmonic: Evidence From Overtone and Combination Bands

Frontiers in Molecular Biosciences, 2021
Fundamental vibrations of the chromophore in the membrane protein bacteriorhodopsin (BR), a protonated Schiff base retinal, have been studied for decades, both by resonance Raman and by infrared (IR) difference spectroscopy.
Victor A. Lorenz-Fonfria, Kiyoshi Yagi, Shota Ito, Hideki Kandori, Hideki Kandori   +4 more
doaj   +1 more source

Severity Grading and Early Retinopathy Lesion Detection through Hybrid Inception-ResNet Architecture

Sensors, 2021
Diabetic retinopathy (DR) is a diabetes disorder that disturbs human vision. It starts due to the damage in the light-sensitive tissues of blood vessels at the retina.
Sana Yasin, Nasrullah Iqbal, Tariq Ali, Umar Draz, Ali Alqahtani, Muhammad Irfan, Abdul Rehman, Adam Glowacz, Samar Alqhtani, Klaudia Proniewska, Frantisek Brumercik, Lukasz Wzorek   +11 more
doaj   +1 more source

ICL Postimplantation Decentration and Tilt in Myopic Patients with Primary Iridociliary Cysts

Journal of Ophthalmology, 2023
Purpose. To observe the decentration and tilt of implantable collamer lens (ICL) as well as possible visual effects postimplantation in primary iridociliary cysts. Methods. The present investigation was a retrospective cohort study.
Ying Wang, Ruibo Yang, Yue Huang, Chen Zhang, Hui Liu, Zhe Jia, Shaozhen Zhao   +6 more
doaj   +1 more source

Molecular Properties of β-Carotene Oxygenases and Their Potential in Industrial Production of Vitamin A and Its Derivatives

Antioxidants, 2022
β-Carotene 15,15′-oxygenase (BCO1) and β-carotene 9′,10′-oxygenase (BCO2) are potential producers of vitamin A derivatives, since they can catalyze the oxidative cleavage of dietary provitamin A carotenoids to retinoids and derivative such as ...
Kyung-Chul Shin, Min-Ju Seo, Yeong-Su Kim, Soo-Jin Yeom   +3 more
doaj   +1 more source

Retinal cell transplantation in retinitis pigmentosa

Taiwan Journal of Ophthalmology, 2021
Retinitis pigmentosa is the most common hereditary retinal disease. Dietary supplements, neuroprotective agents, cytokines, and lately, prosthetic devices, gene therapy, and optogenetics have been employed to slow down the retinal degeneration or improve light perception.
Tongalp H Tezel, Adam Ruff
openaire   +4 more sources

Crystal Structure of the N112A Mutant of the Light-Driven Sodium Pump KR2

Crystals, 2020
The light-driven sodium pump KR2, found in 2013 in the marine bacteria Krokinobacter eikastus, serves as a model protein for the studies of the sodium-pumping microbial rhodopsins (NaRs). KR2 possesses a unique NDQ (N112, D116, and Q123) set of the amino
Nina Maliar, Kirill Kovalev, Christian Baeken, Taras Balandin, Roman Astashkin, Maksim Rulev, Alexey Alekseev, Nikolay Ilyinsky, Andrey Rogachev, Vladimir Chupin, Dmitry Dolgikh, Mikhail Kirpichnikov, Valentin Gordeliy   +12 more
doaj   +1 more source

Retinal Hemodynamics in Retinitis Pigmentosa

American Journal of Ophthalmology, 1996
To investigate the retinal hemodynamic changes occurring in patients with retinitis pigmentosa (RP).Bidirectional laser Doppler velocimetry and monochromatic fundus photography were used to determine retinal venous diameter (D), maximum erythrocyte velocity (Vmax), and volumetric blood flow (Q) in the major retinal veins of eight patients with RP and ...
J E, Grunwald, A M, Maguire, J, Dupont
openaire   +2 more sources

Formation and enterohepatic circulation of metabolites ofc retinol and retinoic acid in bile duct-cannulated rats

Journal of Lipid Research, 1966
Four hours after intraportal injection of retinoic acid-14C into bile duct-cannulated rats, less than 10% of the radioactivity was recovered in the liver, intestine, and kidneys. Within 6 hr, 40% of the radioactivity had appeared in bile.
R.D. Zachman, P.E. Dunagin, Jr., J.A. Olson   +2 more
doaj   +1 more source

Distinct synaptic transfer functions in same-type photoreceptors

eLife, 2021
Many sensory systems use ribbon-type synapses to transmit their signals to downstream circuits. The properties of this synaptic transfer fundamentally dictate which aspects in the original stimulus will be accentuated or suppressed, thereby partially ...
Cornelius Schröder, Jonathan Oesterle, Philipp Berens, Takeshi Yoshimatsu, Tom Baden   +4 more
doaj   +1 more source

Vitamin A Deficiency Alters the Phototransduction Machinery and Distinct Non-Vision-Specific Pathways in the Drosophila Eye Proteome

Biomolecules, 2022
The requirement of vitamin A for the synthesis of the visual chromophore and the light-sensing pigments has been studied in vertebrate and invertebrate model organisms.
Mukesh Kumar, Canan Has, Khanh Lam-Kamath, Sophie Ayciriex, Deepshe Dewett, Mhamed Bashir, Clara Poupault, Kai Schuhmann, Oskar Knittelfelder, Bharath Kumar Raghuraman, Robert Ahrends, Jens Rister, Andrej Shevchenko   +12 more
doaj   +1 more source