Abstract: A device for generating helical electron beams that can be used for radiation therapy is disclosed. The device contains a tertiary collimating cone that can be attached to a gantry of a linear accelerator or placed directly below the gantry. The tertiary collimating cone has a dynamic energy compensator and a magnetic electron collimator to modify the energy of electrons and to generate a helical trajectory. A multileaf collimator may be present within the tertiary collimating cone. A computer coordinates the movements of various components. The helical electron beam produced by this device can be targeted to tumors better and safer and reduce the amount of radiation hitting normal tissue than current devices.

Abstract: A device for generating helical electron beams that can be used for radiation therapy is disclosed. The device contains a tertiary collimating cone that can be attached to a gantry of a linear accelerator or placed directly below the gantry. The tertiary collimating cone has a dynamic energy compensator and a magnetic electron collimator to modify the energy of electrons and to generate a helical trajectory. A multileaf collimator may be present within the tertiary collimating cone. A computer coordinates the movements of various components. The helical electron beam produced by this device can be targeted to tumors better and safer and reduce the amount of radiation hitting normal tissue than current devices.

Abstract: The present invention provides an isolated nucleic acid comprising a first nucleotide sequence encoding an amino acid sequence comprising at least three positively charged amino acid residues, positioned upstream and in frame with a second nucleotide sequence encoding a protein. In addition, the present invention provides an isolated nucleic acid comprising a first nucleotide sequence encoding a DNA binding protein, positioned upstream and in frame with a second nucleotide sequence encoding a protein. An isolated nucleic acid is also provided, which comprises a first nucleotide sequence encoding a bacteriophage lambda repressor protein, positioned upstream and in frame with a second nucleotide sequence encoding a protein.

Abstract: The present invention provides an isolated nucleic acid comprising a first nucleotide sequence encoding an amino acid sequence comprising at least three positively charged amino acid residues, positioned upstream and in frame with a second nucleotide sequence encoding a protein. In addition, the present invention provides an isolated nucleic acid comprising a first nucleotide sequence encoding a DNA binding protein, positioned upstream and in frame with a second nucleotide sequence encoding a protein. An isolated nucleic acid is also provided, which comprises a first nucleotide sequence encoding a bacteriophage lambda repressor protein, positioned upstream and in frame with a second nucleotide sequence encoding a protein.

Abstract: This invention relates to a multi-wavelength optical disc and an apparatus and method to read or write signal therefor. The multi-wavelength optical disc comprises a substrate and a recording layer comprising various photochromic materials to store more data, and a reflective layer on the recording layer. The apparatus comprises at least one monochromic sources to generate a monochromic light beam, each with different wavelengths, a beam combiner to combine the light beams to a coaxial parallel light beam containing various light signals with different wavelengths, and a beam focalizer to focus the light beam on the optical disc. The apparatus also comprises a beam splitter and light detector to read the data recorded on the disc.