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To study the role of the hinge region in nisin and to obtain mutants that exhibit altered or new biological activities and functional properties, we changed certain amino acids in the hinge region by performing site-directed mutagenesis with the nisinZ structural gene (nisZ). The results showed that the nisinZ mutants had decreased antimicrobial activities(More)
Various Maglev launch assist concepts were proposed in the world for the aim to find low-cost, safe, and reliable ways to get to space. Among them, high temperature superconducting (HTS) bulk magnetic levitation platform was considered as a better one for Maglev launch assist because of its inherent stability both in the vertical and lateral directions. As(More)
The present experiment was conducted to determine the digestible energy (DE), metabolizable energy (ME) content, and the apparent total tract digestibility (ATTD) of energy in growing pigs fed diets containing one of ten cottonseed meals (CSM) collected from different provinces of China and to develop in vitro prediction equations for DE and ME content from(More)
High temperature superconductor (HTS) magnetic levitation is proposed to be applied in the micro thrust (mN level) measurement to achieve a fully suspending measuring method for electric propulsion devices, which can get rid of all connecting interferences and lead to higher precision. Levitation friction loss is still the main problem limiting the response(More)
Flux-pinned interaction between high temperature superconductor and applied field provides a new, no-contacting interfacing approach to positive docking and assembling of space module systems. A superconducting interface module configuration is presented in this paper, which consists of a bulk superconductor, an actuation magnet, and an interfacing magnet.(More)
Bulk high-temperature superconductors (HTSs) with good flux trapping provide a feasible application to passive docking and assembling of space module systems. To learn dynamic process and stability of a superconducting interface module consisted of the flux-trapped HTS and an interfacing magnet, an experimental setup is designed to simulate the horizontal(More)
Under the condition of field-cooling magnetization, the superconductor can trap magnetic flux and form a self-stabilizing state within it because of the flux-pinning effect. In most cases, the superconductor interacts with a magnet that is also used to magnetize the superconductor, and then, some self-stabilizing structure such as the magnet-superconductor(More)
A simple and compact dual-frequency monopole antenna is presented and investigated and which is suit for the applications of WLAN IEEE802.11b/g (2400-2484 MHz) and IEEE802.11a (5150-5350 MHz). The screen-print technology is used, to print the CPW-fed dual-frequency antennas on AI<sub>2</sub>O<sub>3</sub> ceramic substrates. The proposed antennas have the(More)
Biogas is high quality green energy, its main compositions of the biogas are methane, carbon dioxide and hydrogen sulfide. Methane of high purity from biogas is of great significance to environment protection and equipment protection. Great differences of formation pressure among methane hydrate, carbon dioxide hydrate and hydrogen sulfide hydrate in water(More)
Accurate measurement for long-term accumulating momentum of electrical propulsion (EP) requires the microthrust stand with high performance. A microthrust-measuring device using high-temperature superconductor magnetic levitation (HTSML) is designed to remove connecting interferences for better evaluation of EP thrusters. Levitating rotation loss is the(More)