It is shown that the velocity of bleaching of visual purple by light, under comparable conditions of concentration, volume, and surface exposed, is directly proportional to the intensity.

A 44-year-old man with Down’s syndrome and neurogenic bladder which required a suprapubic catheter presented with fever and change in his urine color for one day. Physical examination revealed a temperature of 38.3°C, blood pressure of 60/30 mmHg, pulse rate of 120/min and urine with purple discoloration in the urine catheter and bag (Figure 1). A urine dipstick test indicated the presence of l...

A 67-year-old woman presented to the emergency department in congestive heart failure. She also had a history of transverse myelitis, which had caused her to be bedbound with an indwelling urinary catheter. During the physical examination, the urine in her Foley tubing and bag were noted to be bright purple. When asked, she replied that the urine had turned purple several weeks earlier. She den...

Two simple, accurate and sensitive spectrophotometric methods were developed for the determination of ticlabendazole in bulk and pharmaceutical formulation. These methods were based on the formation of ion-pair association complex (1:1) with bromocresol purple (BCP) and bromophenol blue (BPB). The coloured products were extracted into chloroform and measured spectrophotometrically at 420 nm. Li...

Sorghum (Sorghum bicolor (L.) Moench) pericarp pigments can affect grain quality. Pigments found in vegetative parts of the plant and in the peduncle and glumes of flowers (12,44) also may indirectly impact sorghum grain quality. Pigments associated with the “purple wound response” accumulate following mechanical injury, insect feeding, or pathogen invasion (22,31). Grain with nonpigmented peri...

Sweet potatoes are plants that have stem tubers. There a variety of kinds based on the color its tuber, such as white, yellow, and purple. The purple in sweet potato is caused due to existence anthocyanins. Purple was chosen because it gives health benefits consumer contains beta-carotene anthocyanins sources antioxidants. Because benefits, can be said one food security for families. Thus, cult...

Purple urine bag syndrome (PUBS) is a rare condition in which purple discoloration of the collecting bag and its associated tubing occurs. It is considered a benign condition. PUBS is usually associated with urinary tract infection occurring in elderly bedridden women, with chronic urinary catheterization. This syndrome is usually reported to occur in alkaline urine, but here we describe a rare...

The photocycle of the acid-purple form of bacteriorhodopsin (BR) was studied by multiwavelength absorption kinetic measurements. The data were evaluated using a new method based on the differences in the kinetics of the absorption changes at different wavelengths [Tokaji, Zs. (1995) FEBS Lett. 357, 156-160]. The evaluation indicates that, in contrast to the previous suggestion, the photocycle o...

© The Opposite of Green is Purple?

A 50-year-old Caucasian gentleman presented with a oneyear history of a gradually enlarging pigmented lump on the right forearm. On examination there was a 1 cm blue-purple nodule, which was hard in consistency (Figure 1). A mobile dermal cystic component was palpated after lateral pressure. Further dermoscopic examination revealed a homogeneous blue-purple pigmentation surrounded by a subtle b...