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The specification and maintenance of the metameric pattern in Drosophila melanogaster is regulated by complicated gene interactions. The differential expression of the homoeotic genes of the Antennapedia complex (ANT-C) and bithorax complex (BX-C), which determine segmental identities, is partly controlled by cross-regulatory interactions of loci within the(More)
Homeotic genes are responsible for determining the identity of body structures along the anterior-posterior axis. In Drosophila the early patterning system defines the differential expression pattern of the homeotic genes. In laterstages the Polycomb-group (Pc-G) genes were found to keep homeotic genes stably repressed in those domains where they have to be(More)
A composite DNA sequence of regions of hepatitis B virus, determined from a series of recombinant plasmids, reveals the genes for the surface antigen and the core antigen of the virus. The sequence of the core antigen shows it to be a DNA binding protein. The core antigen gene is expressed in Escherichia coli and when injected into rabbits the bacterial(More)
Petascale computing will allow astrophysicists to investigate astrophysical objects, systems, and events that cannot be studied by current observational means and that were previously excluded from computational study by sheer lack of CPU power and appropriate codes. Here we present a pragmatic case study, focussing on the simulation of gamma-ray bursts as(More)
A method for locating auditory brain stem implant electrodes that have been placed in the lateral recess of the fourth ventricle is described. CT bone window images are "inverted" to black on white, then manually superimposed onto soft-tissue window images to enable identification of electrodes in relation to soft-tissue structures.
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