Abstract: Methods for enhancing the production of tissue plasminogen activator (tPA) in cell culture are disclosed. The methods involve culturing tPA-producing cells in growth media supplemented with an alkanoic acid or salt thereof at a concentration which enhances tPA production. The most preferred methods utilize butyric acid or sodium butyrate at a concentration of between 0.1 mM and 10 mM.

Abstract: A multi-channel transmitter (200) in accordance with the present invention overcomes the disadvantages of applying adaptive antenna array technology to multi-channel communication systems. The multi-channel transmitter includes a channel processing element (210), a plurality of radio frequency processing elements (206), and an antenna array (102). The channel processing element includes a channel processor adapted to receive a communication signal from a communication network, a splitter (216) coupled to an output of the channel processor for producing a plurality of substantially identical processed digital communication signal outputs. A plurality of gain and phase adjusters (214) in the channel processing element are coupled to the substantially identical processed digital communication signal outputs. An output of each phase and gain adjuster (214) is coupled to a plurality of up-converters (212), which each produce a digital intermediate frequency output.

Abstract: A multi-channel digital transceiver (400) receives uplink radio frequency signals and converts these signals to digital intermediate frequency signals. Digital signal processing, including a digital converter module (426), is employed to select digital intermediate frequency signals received at a plurality of antennas (412) and to convert these signals to baseband signals. The baseband signals are processed to recover a communication channel therefrom. Downlink baseband signals are also processed and digital signal processing within the digital converter module (426) up converters and modulates the downlink baseband signals to digital intermediate frequency signals. The digital intermediate frequency signals are converted to analog radio frequency signals, amplified and radiated from transmit antennas (420).

Abstract: A multi-channel digital transceiver (400) receives uplink radio frequency signals and converts these signals to digital intermediate frequency signals. Digital signal processing, including a digital converter module (426), is employed to select digital intermediate frequency signals received at a plurality of antennas (412) and to convert these signals to baseband signals. The baseband signals are processed to recover a communication channel therefrom. Downlink baseband signals are also processed and digital signal processing within the digital converter module (426) up converters and modulates the downlink baseband signals to digital intermediate frequency signals. The digital intermediate frequency signals are converted to analog radio frequency signals, amplified and radiated from transmit antennas (420).

Abstract: An insecticidal dust composition comprising an effective amount of diatomaceous earth (DE) in combination with an effective amount of silica selected from the group consisting of precipitated silica and aerogel silica, the DE and silica mixed in different proportions by weight depending on the type of DE, and may preferably be about 95% to 65% DE to about 5% to 35% silica.

Abstract: A receiver (100), transmitter (200) and transceiver (400) in accordance with the present invention overcome the disadvantages of applying adaptive antenna array technology to multi-channel communication systems. Multi-channel radio frequency (RF) signals received via an adaptive antenna array (102) are converted from an analog form to a digital form prior to splitting and processing to recover communication channels contained therein. A number of digital communication signals are digitally combined into a multi-channel digital signal and converted from the digital form to an analog radio frequency form prior to transmission from the adaptive antenna array.

Abstract: Methods for enhancing the production of tissue plasminogen activator (TPA) in cell culture are disclosed. The methods involve culturing TPA-producing cells in growth media supplemented with an alkanoic acid or salt thereof at a concentration which enhances TPA production. The most preferred methods utilize butyric acid or sodium butyrate at a concentration of between 0.5 mM and 2.5 mM.

Abstract: A split frequency band signal digitizer (10) includes a first mixer (18) for translating a split-band signal (200) about a multiple of the sampling frequency. The split-band signal so translated is then communicated to an analog-to-digital converter (26). The digitized signal is then analyzed to recover an original portion of the split-band signal and a second portion of the signal aliased into a single Nyquist band.

Abstract: An electric trouble finding apparatus comprises means to test either hot or cold circuits with a single unit. The apparatus comprises a first pair of binding posts which serve as the coupling means to a hot output and a second pair of binding posts which may serve simultaneously as connecting means to a cold or inert circuit. The unit includes a four pole double throw switch having a single lever control and a plurality of twelve terminals in the switch arrangement. A first pair of oppositely positioned switch terminals are connected to an AC power source while a second pair of opposite terminals in the switch are connected to respective hot binding posts. One of the cold binding posts is connected through a lamp to a terminal in the switch while the opposite terminal is coupled to the other cold binding post. A pair of terminals in the switch are interconnected while another pair of terminals in the switch are coupled to the hot outlet from the power supply.