The brilliant red, orange and yellow colours of parrot feathers are the product of psittacofulvins, which are synthetic pigments known only from parrots. Recent evidence suggests that some pigments in bird feathers function not just as colour generators, but also preserve plumage integrity by increasing the resistance of feather keratin to bacterial degradation. We exposed a variety of colourfu...

Recent research in the U.S. and Europe indicates that viewing red enhances men’s attraction to women. This red effect may reflect a basic predisposition shared across cultures, and may thus represent a functional human universal – that is, a psychological process that carries the same meaning in all human societies (Norenzayan & Heine, 2005). We conducted a first test of this universality hypot...

Short pulses of red light induce in etiolated barley seedlings an enhanced synthesis of plastidic benzoquinones and vitamin K1, which can be reverted by subsequent irradiation with short pulses of far-red. As compared to the dark there is more formation of plastoquinone-9 than alpha-tocopherol. The enhanced formation of vitamin K1 is coupled with a concomitant decrease in the level of the secon...

This factsheet gives the general public and citrus growers basic knowledge regarding California red scale. Written by X. Martini J. Price, published UF/IFAS Entomology Nematology Department, November 2022.

Monascus purpureus C322 was cultivated on well-established production media to yield prevailingly red or orange pigment-rich ethanolic extracts. Once these extracts had been diluted by an overall factor of 50, they were used as such to dye raw wool standard specimens differently premordanted using alum or stannic chloride. Independently of the mordant used, the specimens dyed with the red pigme...

BACKGROUND A basic premise of the recently proffered color-in-context model is that the influence of color on psychological functioning varies as a function of the psychological context in which color is perceived. Some research has examined the appetitive and aversive implications of viewing the color red in romance- and achievement-relevant contexts, respectively, but in all existing empirica...

Proanthocyanidin is one of the main active compounds found in red jasmine rice. We previously reported that red rice extract could reduce cancer cell invasion. However, the direct effect of proanthocyanidin from red rice on the invasion of cancer cells and the exact molecular mechanism remained unclear. Here, we report for the first time that proanthocyanidin-rich fraction from red rice (PRFR) ...

The Latin language contains a number of synonymous terms in its basic color categories. The goal of this essay is to trace the diachronic trends of such terms; to discover which term, if any, is the favored term for a color category; and to determine whether it became established as such in sequence with the Universal Evolution (UE) model. I examine the frequencies of all potentially-basic colo...

Cone photoreceptors of the vertebrate retina terminate their response to light much faster than rod photoreceptors. However, the molecular mechanisms underlying this rapid response termination in cones are poorly understood. The experiments presented here tested two related hypotheses: first, that the rapid decay rate of metarhodopsin (Meta) II in red-sensitive cones depends on interactions bet...