6results about How to "Reduce attack" patented technology

The invention discloses a preparation method of high-stability superoxide dismutase (SOD), and belongs to the technical field of bioengineering and enzyme engineering. The method comprises the following steps: chemically modifying purified SOD (superoxide dismutase) under the conditions of low temperature and neutral pH (potential of hydrogen) by taking monomethoxy polyethylene glycol succinimido active ester as a modifier; carrying out ultrafiltration preliminary purification on the reaction liquid, then carrying out deep purification through ion exchange chromatography, and separating to obtain a high-purity modified product; and finally, sterilizing, filtering and freeze-drying to obtain the freeze-dried powder. According to the method, by optimizing a modification and purification process, the thermal stability and protease degradation resistance of SOD are remarkably improved, and meanwhile, most enzyme activity of SOD is effectively reserved. The prepared PEG-SOD product is high in purity and good in stability, and is suitable for preparing anti-inflammatory, anti-oxidation or anti-aging medicines and functional foods.

The invention relates to the technical field of cosmetics, in particular to a composite peptide-containing composition for increasing skin elasticity and a preparation method thereof, and the composite peptide-containing composition comprises composite peptide and composite plant extract; the composite peptide is prepared from the following raw materials: oligopeptide-4, palmitoyl dipeptide-7, tripeptide-10 citrulline, and an antioxidant. The composite plant extract is prepared from the following raw materials: plumeria rubra flowers, chayote fruits and plantain fruits. Different peptides are selected to form the composite peptide raw material for improving the skin elasticity, so that multi-channel improvement on the skin elasticity can be adaptively realized, and the effect of improving the skin elasticity of a finished product is effectively improved. The white plumeria rubra flowers, the chayote fruits and the big banana fruits are blended and extracted, the active ingredients of the obtained compound extracting solution are diversified and complementary in effect, the compound extracting solution can have different effects of resisting oxidative stress reaction, removing various free radicals and reducing attack of reactive oxygen free radicals on skin collagen, and the remarkable anti-oxidation effect is achieved through the synergistic effect.

This application relates to a resource access system and a resource access method. The system includes: a network range platform, an authentication center, and multiple business systems; each business system, in response to a user's access request, redirects to the login interface of the network range platform; the network range platform redirects the login request to the authentication interface of the authentication center; the authentication center, upon successful authentication, redirects to the network range platform; the network range platform generates a service ticket, enabling the user to access the business systems using the service ticket; each business system, based on the service ticket and request signature, generates and sends a verification request to the network range platform; if the service ticket and request signature pass validity verification, the network range platform returns user information to the business systems, enabling the business systems to create a local session and configure access identification information based on the user information, allowing the user to access the resources of the business systems based on the access identification information. Using this system improves resource access security.

The invention relates to the field of boron neutron capture therapy, and discloses a method for improving the corrosion resistance of an accelerator neutron source target cooling system, which comprises the following steps: 1) forming a periodic micron-order corrugated oxide film on the surface of a non-target material layer of a copper substrate of the accelerator neutron source target cooling system by laser marking treatment; (2) an alpha-Ta film of a body-centered cubic structure grows on the surface of the oxidation film through magnetron sputtering; and after passivation, the Ta2O5 is converted into a Ta2O5 passive film. The method comprises the following steps: firstly, forming an oxide film with a special shape of periodic micron-sized corrugation on the surface of a copper substrate by utilizing laser marking treatment; an alpha-Ta film is further grown on the surface of the oxidation film through magnetron sputtering; and the copper substrate is passivated into a Ta2O5 passive film, so that the corrosion resistance of the surface of the copper substrate is greatly improved.

The utility model discloses a multifunctional safety arm shield which comprises a mounting frame, two sliding rods are symmetrically distributed and fixedly connected to the left inner side wall and the right inner side wall of the mounting frame, two first buffering assemblies are arranged at the two ends of each sliding rod and connected with a supporting rod, one end of each supporting rod is hinged to the middle of an arm shield body, and the other end of each supporting rod is hinged to the right inner side wall of the mounting frame. Two anti-chopping pointed cones are symmetrically distributed and fixedly connected to the side face of the arm shield body, a plurality of second buffering assemblies are arranged between the mounting frame and the arm shield body, a neck clamping plate is fixedly connected to the left side face of the mounting frame, and a holding handle is fixedly connected to one end of the side face of the mounting frame. When the arm shield is used, vibration borne by the arm shield body is transmitted to the supporting rod and the connecting rod, the supporting rod extrudes the damping spring through the sliding block, the connecting rod extrudes air in the fixing pipe through the piston, double buffering is formed through deformation generated by the damping spring and damping force generated by compressed air, and impact of striking on arms is relieved.

The invention discloses a corrosion-resistant silicone rubber composition and a preparation method thereof.The silicone rubber is prepared from, by weight, 80-100 parts of polysiloxane, 5-10 parts of a modified additive and 0.03-0.05 part of a Karst catalyst, when the raw materials are injected into a mold to be subjected to high-temperature reaction, Si-H bonds on a polysiloxane molecular chain are grafted with double bonds on the modified additive, and when the raw materials are injected into the mold to be subjected to high-temperature reaction, the Si-H bonds on the modified additive are grafted with the double bonds on the modified additive; the cross-linked network can reduce molecular chain segment movement, reduce diffusion paths of corrosive media and effectively prevent permeation of corrosion factors such as moisture, oxygen and ions, methyl, phenyl and fluoroalkyl of side chains further shield a main chain through a hydrophobic effect, permeation and attack of chemical media are reduced, and the corrosion resistance is improved. The inorganic filler part can form a physical barrier in the material, so that the corrosion resistance effect of the prepared silicone rubber composition is further improved.