We review the question posed in the title, with emphasis on hard-collision phenomena utilizing rapidity gaps and jets as a diagnostic. If constituent quarks are very black, it is conceivable that various exotic phenomena exist , including production of strange matter, disoriented chiral condensate, and/or ultra-hot quark-gluon plasma.

Water soluble inorganic particles components (Cl, SO 4 , NO − 3 , and NH + 4 ) and concentrations of their associated precursor gases (HCl, SO2, HNO3, NH3) were semi-continuously measured using the Dionex Gas Particle Ion Chromatography (GPIC) system. Sampling was conducted adjacent to a high traffic street in downtown Toronto, Canada from June 2006 to March 2007. This study evaluated the preci...

Inga species present brush-type flower morphology allowing them to be visited by distinct groups of pollinators. Nectar features in relation to the main pollinators have seldom been studied in this genus. To test the hypothesis of floral adaptation to both diurnal and nocturnal pollinators, we studied the pollination ecology of Inga sessilis, with emphasis on the nectar secretion patterns, effe...

Forty four children with daytime wetting were included in a randomly controlled trial of two alarm devices, a contingent one that sounded when wetting occurred and a non-contingent one that went off from time to time unrelated to wetting events. A quota allocation system ensured comparability between treatment groups. Two thirds responded to an alarm by becoming dry. The non-contingent alarm pr...

Twenty-seven children with diurnal enuresis were studied in a double-blind randomised controlled trial of imipramine. Outcome was not related to such features as age, gender, maximum functional bladder capacity, or evidence of psychiatric disturbance. Although the condition in several children improved, no evidence emerged to suggest that imipramine was superior to placebo in the treatment of t...

Dopa-responsive dystonia (DRD) is an autosomal dominant neurologic disorder characterized by incomplete penetrance and high variability of its phenotypic expression. The usual phenotype is defined by early-onset isolated dystonia, predominant in the lower limb, with marked diurnal fluctuations and a dramatic and sustained response to low doses of L-DOPA. We report 2 members of the same family (...

Dopa-responsive dystonia (DRD) is an autosomal dominant disorder typically presenting as dystonia with diurnal variability. Described is an 8-year-old boy who had had waddling gait, generalized hypotonia, and proximal weakness since early childhood. He responded well to low-dose L-dopa. He had a point mutation of the GTP cyclohydrolase I gene. The patient's father and sister had the same mutati...

Wind and temperature observations in the mesosphere and lower thermosphere (MLT) from the Upper Atmosphere Research Satellite (UARS) reveal strong seasonal variations of tides, a dominant component of the MLT dynamics. Simulations with the Spectral mesosphere/lower thermosphere model (SMLTM) for equinox and solstice conditions are presented and compared with the observations. The diurnal tide i...

This work accounts for an investigation about the diurnal variation of aerosol spectral transmittance of solar irradiance under dominant wind conditions as case studies. Such a work is carried out in Athens for first time. The spectral transmittance values estimated were derived using Ž . ground-based spectral measurements of beam irradiance in the range 310–575 nm UV and VIS . The data were re...