I investigated the effects of habitat color and location on community structure in artificial water-filled treeholes in the forest of Barro Colorado Island, Panama. The macroinvertebrate fauna of 9 replications (5 in understory, 4 in tree-fall gaps) of black, blue, red, and green 650 ml plastic cups were censused weekly for 7 wks. Macroinvertebrate abundance and species richness were greater in...

Additives, especially colors, are in widespread use in the food industry. With the exception of the quinolines, food colors are relatively weak mutagens and are certified as safe additives despite reports that some people have allergic reactions to them. The number of food additives is still on the increase, and research on their potential mutagenic/carcinogenic activity in vivo is very expensi...

The role of olfactory cues such as carbon dioxide, pheromones, and kairomones in bed bug, Cimex lectularius L. behavior has been demonstrated. However, the role of vision and mechanoreception in bed bug behavior is poorly understood. We investigated bed bug vision by determining their responses to different colors, vertical objects, and their ability to detect colors and vertical objects under ...

Editorial/Commentary DPC | Dermatol Pract Concept 2013;4(2):10 51 In this issue, Rosendahl and colleagues report a case of non-choroidal melanoma that shows a strikingly unusual dermatoscopic aspect, namely, structureless yellow color. The authors correlate the yellow color to the presence of lipofuscin using tissue staining with Sudan Black. Upon dermatoscopy, colors are important because they...

'The dress' is a peculiar photograph: by themselves the dress' pixels are brown and blue, colors associated with natural illuminants, but popular accounts (#TheDress) suggest the dress appears either white/gold or blue/black. Could the purported categorical perception arise because the original social-media question was an alternative-forced-choice? In a free-response survey (N = 1401), we foun...

Introduction The problem of halftoning in digital printing has provided a splendid new example of a mathematical opportunity in modern technology. Digital halftoning is the technique used to display an image with a few immiscible colors discretely applied to paper. This problem involves various fields of science such as the physics of light, the biology of the human visual system, and the mathe...

the significance of mysticism can be traced in relying on illumination rather than logic and reasoning to discover the truth. theoretically speaking, mysticism means having belief in understanding the truth and practically speaking it means leaving superficial customs and resorting to suffering. mysticism among muslims is exclusive to mystics who have changed names over time. sufi is someone wh...

*Correspondence: Lina María Arenas, Sensory Ecology Group, Centre for Ecology and Conservation, College of Life and Environmental Sciences, University of Exeter, Cornwall Campus, TR10 9EZ, Penryn, UK e-mail: [email protected] Vivid warning signals (aposematism) have evolved repeatedly throughout the animal kingdom. However, relatively few studies consider what makes an effective signal, in terms ...

N distinguishable players are randomly fitted with a white or black hat, where the probabilities of getting a white or black hat may be different, but known and the same to all the players. All players guess simultaneously the color of their own hat observing only the hat colors of the other N − 1 players. The team wins if all players guess right. No communication of any sort is allowed, except...

We consider the problem of finding a color scale which performs well when converted to a grayscale. We assume that each color is converted to a shade of gray with the same intensity as the color. We also assume that the color scales have a linear variation of intensity and hue, and find scales which maximize the average chroma (or “colorfulness”) of the colors. We find two classes of solutions,...