Signalling by the epidermal growth factor receptor (EGFR) plays a critical role in the segmental patterning of the ventral larval cuticle in Drosophila: by expressing a dominant-negative EGFR molecule or Spitz, an activating ligand of EGFR, we show that EGFR signalling specifies the anterior denticles in each segment of the larval abdomen. We provide evidence that these denticles derive from a ...

Among other factors, the precision of dental impressions is an important and determining factor for the fit of dental restorations. The aim of this study was to examine the three-dimensional (3D) precision of gypsum dies made using a range of impression techniques and materials. Ten impressions of a steel canine were fabricated for each of the 24 material-method-combinations and poured with typ...

1.Eikenberg S. Comparison of the cutting efficiencies of electric motor and air turbine dental handpieces. Gen Dent 2001;49(2):199-204. 2.Eikenberg S, Roman D, Debuque R, Gerrono D, Harris E. Protocol 451: Development of lightweight, low cube, portable dental field equipment. http://hayeshandpiece.com/Army_Study_On_Electric_Handpieces.pdf. Accessed Oct. 27, 2006. 3.Watson TF, Flanagan D, Stone ...

OBJECTIVES To evaluate the possible role of silodosin (a highly selective α1A-adrenoceptor antagonist) in facilitating the passage of distal ureteric stones (DUS) in children, as the role of α-blockers as medical expulsive therapy is well known in adults. PATIENTS AND METHODS In all, 40 paediatric patients (27 boys and 13 girls) diagnosed with unilateral, single, radiopaque DUS of <10 mm were...

While the history of taxonomic diversification in open ocean lineages of ray-finned fish and elasmobranchs is increasingly known, the evolution of their roles within the open ocean ecosystem remains poorly understood. To assess the relative importance of these groups through time, we measured the accumulation rate of microfossil fish teeth and elasmobranch dermal denticles (ichthyoliths) in dee...

A new species of Tripartiella is described from the gills of the wild saddle cichlid Aequidens tetramerus in north Brazil. Wet smears of skin and gills of examined fish were air-dried at room temperature and impregnated with Klein's dry silver method for examination of the adhesive disc's structures and denticles. Total prevalence of parasitism was 65%. This ciliate is characterized as a small-...

the number of bacteria per dauerjuvenile. Preliminary data established similar LD50s and LT50s for X. nematophilus subsp, nematophilus (from the DD 136 strain) and X. nematophilus subsp, nematophilus vat. mexicanus (from the Mexican strain). The absence of toxin production by either S.feltiae strain or bacterial types in a culture medium similar to the host's hemolymph has been reported (5,6). ...

The insect integument displays uniform posterior orientation of cuticular denticles or bristles formed by the epidermal cells. We want to understand how cell polarities become uniformly oriented in the plane of the epidermal sheet. Here we test whether directed cell migration disturbs the orientation of denticles. Burning a circular area of epidermal cells beneath the cuticle causes cells to mi...

As an intermediate step in the development of a defined quantitative model of pattern formation during Drosophila segmentation, we present here a model capable of predicting the experimentally determined levels of gene activity and their phenotypic consequences. In its present form, the model includes only four genes: the three genes of the bithorax complex (Ubx, abd-A and Abd-B) and Antennaped...

Study of four poorly known cladocera species of the genus Camptocercus Baird,1843 (Anomopoda: Chydoridae): North American C. oklahomensis Mackin, 1930, and three Palearctic species, C. uncinatus Smirnov, 1971, C. fennicus Stenroos, 1898, and C. lilljeborgi Schoedler, 1862, revealed strong differences between them in both outer morphology and morphology of appendages. C. oklahomensis lacks a hea...