Abstract: A frictional door holder and stop is designed to provide users with a device that retains a door in an opened position. It is simply comprised of a door holder, a door stop, and a buffer. The door holder, a bent sheet metal structure, has a door holder top near the middle to contact the door's bottom surface, a door holder front end bent upward to reduce the friction force between the door holder and the floor and prevent the floor from being scratched, and a door holder rear end set underneath the door stop to be held to a fixed position relative to the door stop and floor by connectors. The present invention is used for doors with a little retuning force making the door close such as the doors without a door closer. With the frictional door holder and stop, the door can be easily closed as usual without any extra actions such as releasing a holder by a hand or a foot. Its simple structure and characteristic of combining the door holder with the door stop will benefit the users and manufacturers.

Abstract: A two high bathroom tissue dispenser is designed to provide users with a bathroom tissue dispenser that holds two rolls at a time. It is simply comprised of a housing, a pair of opposing side supports, and a cover. The housing has front, rear, side, and bottom walls, an empty core holder, and a discharge opening. Each support consists of a plate hingedly secured to the sidewalls, roll hanger to pick up and hold a bottom bathroom tissue roll, a snap, and a block.

Abstract: A method for quantitatively determining the relative copy number of a gene of interest introduced recombinantly into a cell is disclosed. The method includes the steps of propagating, in a suitable culture medium, cells that are transformed with a chimeric gene construct containing and capable of expressing the gene introduced into the cells, where said construct includes (i) a control nucleic acid segment having a region of DNA capable of hybridizing with a region of native genomic DNA associated with the cell; and (ii) a second nucleic acid region that contains said gene of interest; isolating DNA from the cells; and determining the ratio of the control nucleic acid segment to the region of native genomic DNA in the isolated DNA as a quantitative measure of the relative copy number of the gene in the cell.

Abstract: A simple yet versatile noncontact optical inspection instrument and method are described for the inspection of magnetic disk surfaces for surface defects. This instrument is capable of inspecting the disk surface at any point in the disk manufacturing process. Surface defects such as bumps, pits and scratches can be measured. Surface contaminants such as particles and stains can also be measured. The instrument is also capable of discriminating between surface defects and surface contaminants. The instrument is comprised of two identical optical sensors which are located on opposite sides of the disk. A carriage supports and translates these sensors along the disk radius while a spindle rotates the disk. Both surfaces of the disk are therefore simultaneously scanned in a spiral fashion. The sensor's illumination optics produce a monochromatic focused spot of light which is normally incident upon the disk surface.