Enrichment cultures for purple nonsulfur and sulfur photosynthetic bacteria were prepared from soil samples collected in central and northern Minnesota. The purple nonsulfur bacteria were found in most wetland soils sampled but were uncommon in woodland and grassland soils. The pH range of the soils in which these bacteria occurred was 3.8 to 7.8, and the oxidation-reduction potential (E(h)) ra...

It is now well established that vision in dim light is due to the photochemical decomposition of “visual purple,” a pigment present in the rods of the retina (1). Visual purple is believed to be a conjugated protein in which vitamin A or one of its derivatives is a prosthetic group (2). As might be expected, the spectral sensitivity curve of the eye parallels the absorption spectrum of visual p...

Consider a set of n points in the plane, each one of which is colored either red, blue, or purple. A red-blue-purple spanning graph (RBP spanning graph) is a graph whose vertices are the points and whose edges connect the points such that the subgraph induced by the red and purple points is connected, and the subgraph induced by the blue and purple points is connected. The minimum RBP spanning ...

The effect of pH and temperature on the stability and visual colour of aqueous anthocyanin (ACY) extracts from purpleand red-flesh potatoes was evaluated and compared to commercial ACY extracts from grape and purple carrot. Extracts from purple carrot and redflesh potatoes showed higher stability than grape and purple-flesh potato extracts. Stability to pH (63) and thermal degradation of extrac...

Purple urine bag syndrome is characterized by the urinary drainage bag turning purple in patients on prolonged urinary catheterization, especially those in the bedridden state. It is associated with bacterial urinary tract infections caused by indigo-producing and indirubin-producing bacteria, usually affects women, and is associated with alkaline urine, constipation, and a high bacterial load ...

CASE REPORT A 57-year-old paraplegic male diagnosed with non-Hodgkin's lymphoma and complete spinal cord compression arrived at our clinic because of fever and purple discoloration of the urine. We diagnosed purple urine bag syndrome (PUBS) and treated him with oral ciprofloxacin and urinary catheter replacement. DISCUSSION PUBS is an unusual phenomenon that occurs predominantly in bedridden ...

PURPLE was the designation given by U.S. cryptanalysts to the cipher machine used by the Japanese Foreign Office for secure communications before and during WW 2. We present the structure and internal wiring of the machine, as well as details of the keying procedures and a system of abbreviations, which was used in the messages. We have also written a computer simulation of the PURPLE machine. ...

Rhodopsin (visual purple), the photolabile chromoprotein in the retinal rod cells of most vertebrates, bleaches in the light with the release of unstable orange lipides (1) which appear to be precursors (2, 3) of vitamin A aldehyde (retinene) (4, 5). The aldehyde is ultimately reduced to vitamin A alcohol by an enzymatic process (2), which requires reduced diphosphopyridine nucleotide as coenzy...

Introduction THE precise relationship which has been established between the scotopic luminosity curve a'nd visual purple (Dartnall & Goodeve, 1937; Wald, 19138) leads one to expect that the photopic luminositv curve is'similarly related to some " photopic " pigment or pigments. This latter hypothesis has given rise to considerable speculation, particularly since the evidence for the existence ...