Estimates of the incidence of metameric surfaces, defined as having different spectral reflectances but appearing the same under a given light, were obtained from 40 hyperspectral images of natural scenes. The degree of metamerism was specified with respect to a color-difference metric after allowing for full chromatic adaptation to the scene. Although the proportion of pairs of surfaces in an ...

Herpes zoster (HZ, shingles) is a disease characterized by monolateral vesicular rash and pain, due to reactivation of VZV in the context of a waning specific anti-VZV cell-mediated immunity. Reactivation of VZV produces a new wave of viral replication within the dorsal root ganglia where latency was established after primary infection and its spread downwards to peripheral metameric fibers thr...

The medicinal leech has served as an important experimental preparation for neuroscience research since the late 19th century. Initial anatomical and developmental studies dating back more than 100 years ago were followed by behavioral and electrophysiological investigations in the first half of the 20th century. More recently, intense studies of the neuronal mechanisms underlying leech movemen...

In Drosophila, the Deformed (Dfd) and Sex combs reduced (Scr) genes determined the developmental pathways followed by the most anterior metameric units. Using in situ hybridization, we have monitored the spatial distributions of transcripts from these two genes. Dfd RNA accumulates in parasegments 0 and 1; Scr RNA accumulation shows a dynamic pattern spanning parasegments 2 and 3. The expressio...

Discrimination for equiluminant chromatic stimuli that vary in L- and M-cone excitation depends on the chromaticity difference between the test field and the surrounding area. The current study investigated the effect of the proximity in space and time of a surround to the test field on chromatic contrast discrimination. The experimental paradigm isolated spatial, temporal, and spatial-and-temp...

The homeotic gene Ultrabithorax (Ubx) specifies metameric identities in multiple tissues of the thorax and abdomen in Drosophila melanogaster. Alternatively spliced Ultrabithorax mRNAs encode five protein isoforms that differ in internal sequences immediately adjacent to a homeodomain DNA-binding motif. Each of these proteins is phosphorylated in vivo at multiple serine and threonine residues. ...

abstract background: at present study, acid modified banana leaf ash was used as an adsorbent for the successful removal of reactive black 5 (rb5) dye from aqueous environments. materials and methods: the effect of various operating parameters such as ph of solution, dye concentration, contact time, adsorbent dosage, and the temperature was investigated. results: maximum adsorption capacity of ...

black seed (nigella sativa) is considered as a biological response modifier. thymoquinone (tq) is the bioactive and the most abundant constituent of the volatile oil of this seed which has been shown to possess anti-inflammatory, antioxidant and anti-neoplastic effects. in this study, the effect of tq on hepg2 cell line was investigated in an attempt to identify its potential mechanism of actio...