11results about How to "Change composition" patented technology

The invention discloses an Apiotrichum loubieri gene and an application of the Apiotrichum loubieri gene. Relates to the technical field of fermentation. The invention provides a specific strain and application thereof in reconstituted tobacco. According to the tobacco leaf extracting solution fermented by the bacterial strain, the content of esters such as 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, dimethyl phthalate, tributyl phosphate, dihydroactinidiolide and methyl palmitate is remarkably increased, and the content of the esters such as 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, dimethyl phthalate, tributyl phosphate, dihydroactinidiolide and methyl palmitate is remarkably increased; nine novel ester substances with aromatic smell, fruit fragrance, flower fragrance and other characteristic aromas are newly generated, and four phenolic aroma components are newly added. And the whole fragrance style is obviously enhanced. It is shown that the aroma-producing Apiotrichum loubieri AL-4 fermented tobacco enzyme extracting solution has good aroma-producing capacity, and through the combined effect of enzymolysis and fermentation, the aroma-producing Apiotrichum loubieri AL-4 fermented tobacco enzyme extracting solution is expected to play an important application value in the field of reconstituted tobacco raw material quality improvement.

The utility model discloses a soil sampling device with a light shielding structure, which relates to the technical field of soil sampling and comprises a base and a sampling barrel arranged below the base, support plates are symmetrically arranged at the upper end of the base, a plurality of limiting nails are fixedly arranged at the lower end of the base, a through hole is formed in the middle of the base, and the through hole is communicated with the sampling barrel. The device further comprises a light shielding mechanism and an adjusting mechanism, the light shielding mechanism is arranged between the two supporting plates, and the adjusting mechanism is arranged at the upper end of the sampling barrel. According to the soil sampling device, the light shielding mechanism is arranged, so that the influence of external illumination on soil in the sampling barrel can be effectively reduced, the change of the internal properties and components of a soil sample is avoided, the soil at different depths can be sampled by arranging the adjusting mechanism, and the rotating assembly is arranged, so that the soil sampling device is convenient to use. The collected soil can be conveniently and rapidly cut off and shielded, and the phenomenon that the soil cannot be brought out or falls down due to the fact that the soil viscosity is large when the device is pulled out is effectively avoided.

The application discloses a creep-resistant die-casting rare earth magnesium alloy with high strength and high fluidity, and a preparation method and application thereof. The application belongs to the field of die-casting magnesium alloys. The magnesium alloy comprises, in percentage by mass, Al: 4.8-7.2%, La: 3.0-4.2%, Sm: 1.2-2.0%, Y: 0.4-1.2%, Mn: 0.1-0.6%, Te: 0.01-0.1%, Bi: 0.01-0.5%, and the balance of Mg and inevitable impurity elements. The application significantly refines the structure of the magnesium alloy by optimizing the alloy composition, changes the composition, distribution and morphology of intermetallic compounds in the alloy, simultaneously generates Al-Te phases stable at high temperatures, improves the mechanical properties and creep resistance of the magnesium alloy, and further improves the die-casting fluidity of the magnesium alloy, so as to meet the requirements of large-scale integrated design automobile parts.

The present invention belongs to the field of nanoparticles and nanoparticle synthesis. In particular, the present invention relates to a method and system for producing core / shell nanoparticles, as well as core / shell nanoparticles. A method for producing core / shell nanoparticles is provided, comprising: - producing nanoparticles; - transporting the nanoparticles by a gas stream; - forming one or more shells around the nanoparticles while the nanoparticles are transported by the gas stream.

This utility model discloses a treatment device for mitigating coking of atmospheric residue oil, belonging to the field of petroleum processing technology. The device includes a vacuum furnace and a vacuum tower. The vacuum tower has a packing layer inside. Its key feature is that it further includes a hydrogenation reactor and a gas-liquid separator. The outlet of the vacuum tower is connected to the inlet of the hydrogenation reactor via a pipeline. The outlet of the hydrogenation reactor is connected to the inlet of the gas-liquid separator via a pipeline. The liquid phase outlet of the gas-liquid separator merges with the atmospheric residue oil feed stream and is then connected to the inlet of the vacuum furnace via a corresponding pipeline. The outlet of the vacuum furnace is connected to the inlet of the vacuum tower via a pipeline. This utility model, by adding a hydrogenation reactor and a gas-liquid separator and reorganizing the pipeline connections, allows the wash oil to be pretreated before mixing, fundamentally improving the thermal stability of the oil, reducing the coking tendency of the residue oil, and extending the operating cycle of the device.

The invention discloses a polymerization method of a polypropylene composition, and belongs to the field of polymerization. An olefin monomer comprising propylene is contacted with a catalyst system in the upstream polymerization sections of a gas phase copolymerization reactor to form polymer particles, and a condensing medium is introduced in at least one upstream polymerization section or between or after the upstream polymerization sections; in the upstream polymerization section, the obtained polymer particles and the condensing medium enter the gas phase copolymerization reactor in the form of wet particles, and in the presence of the condensing medium, propylene and alpha-olefin are polymerized in the gas phase copolymerization reactor to obtain the polypropylene composition. The condensing medium can effectively improve heat dissipation of an upstream polymerization section, enables polymer particles to be distributed more uniformly, avoids kettle sticking and caking phenomena caused by generation of local hot spots, can also improve the heat removal capability and space time yield of a gas phase copolymerization reactor, enhances the copolymerization activity of olefin monomers in the gas phase copolymerization reactor, and improves the yield of olefin monomers in the gas phase copolymerization reactor. And the bonding condition of the particle surface is improved.

The invention discloses a cruciferous bud seedling production method capable of enriching beneficial thioglycoside and reducing useless thioglycoside and a nutrient solution. The nutrient solution for the cruciferous bud seedlings is a mixed aqueous solution of chitosan oligosaccharide and nano-selenium, the concentration of the chitosan oligosaccharide is 10-100 mg / L, and the concentration of the nano-selenium is 2-50 mg / L. By applying the nutrient solution provided by the invention and regulating and controlling the uptake and utilization of the plants on the sulfur element, the composition and content of the thioglycoside component in the cruciferous bud seedlings are changed, a more scientific and efficient solution is provided for the production of the cruciferous bud seedlings, green vegetables and functional food raw materials with higher quality and outstanding nutritional characteristics are provided for the market, and the economic benefits of the cruciferous bud seedlings are improved. And consumers can obtain high-quality sprouts which are rich in beneficial thioglycoside and contain few unfavorable thioglycoside.

The invention provides a wave-absorbing epoxy resin plate with high toughness. The wave-absorbing epoxy resin plate is prepared from the following raw materials in parts by weight: 180 to 282 parts of 862 type epoxy resin, 10 to 72 parts of 128 type epoxy resin, 8 to 48 parts of E39D type epoxy resin, 2500 to 4500 parts of carbonyl iron powder, 1750 to 3150 parts of a coupling agent, 1250 to 2250 parts of absolute ethyl alcohol, 8 to 12 parts of a de-foaming agent, 8 to 12 parts of a dispersing agent and 210 parts of a curing agent. The coupling agent is added to coat the carbonyl iron powder, so that the corrosion resistance of the wave-absorbing epoxy resin plate can be improved; the 862 type epoxy resin, the 128 type epoxy resin and the E39D type epoxy resin are mixed to obtain the compound epoxy resin, so that the composition and the structure of a macromolecular chain of the epoxy resin are changed, the flexibility of the molecular chain is increased, the glass-transition temperature of the wave-absorbing epoxy resin plate is reduced, and the toughness of the wave-absorbing epoxy resin plate is improved.

The invention relates to the technical field of medicines, in particular to application of euglena in preparation of a product for prevention and / or adjuvant therapy of cerebral arterial thrombosis. Experiments prove that by means of supplementation of the euglena, the infarct volume is remarkably reduced, the neurological function defect is relieved, the synaptic plasticity of mouse hippocampus is enhanced, and the neuroprotective effect of the euglena is related to improvement of the integrity of intestinal barriers, reduction of systemic and neuroinflammation and regulation of intracerebral insulin signal channels; and the euglena can favorably change the composition of intestinal microbiota and promote the production of short-chain fatty acids. In conclusion, the euglena can relieve the cerebral arterial thrombosis through the enterocerebral axis, so that the euglena can be well used for developing related products for prevention and / or adjuvant therapy of the cerebral arterial thrombosis.

The invention relates to an anti-corrosion treatment process for a locally encapsulated magnesium alloy, and belongs to the technical field of locally encapsulated magnesium alloy surface treatment. According to the method, dirt and an oxide layer on the surface of the magnesium alloy are effectively removed through sand blasting treatment, the surface roughness is improved, a good adhesion foundation is provided for subsequent electrochemical treatment, and the corrosion resistance of the magnesium alloy is remarkably improved through an oxide film formed by components such as silicate in the electrolyte on the surface of the magnesium alloy. According to the invention, the problem of glue burning at a glue coating part is solved by increasing the content of fluoride salt in an alkaline silicate system and introducing a phosphate additive. The concentration of the fluoride salt is larger than 10 g / L, the content of sodium fluoride is increased, the intensity degree of the arc discharge process can be reduced, generated electric arcs are finer, local electric arc energy is lower, generated heat is more dispersed, the heat is more easily taken away by liquid medicine, and then ablation of plastic at the rubber coating position caused by heat accumulation is avoided.

The invention belongs to the technical field of biological metabolism engineering and food fermentation, and discloses an outer membrane lipoprotein LpoA mutant, recombinant Escherichia coli, a method and application in fucosyllactose production, the LpoA mutant is obtained by mutating the 919th base C of a wild type LpoA coding gene into T, and the nucleotide sequence of the LpoA mutant is SEQ ID NO.1. The invention further discloses an application of the LpoA mutant in fucosyllactose production. After escherichia coli LpoA is mutated, the escherichia coli LpoA is applied to production of human milk oligosaccharide, and the yield of 2 '-FL and 3-FL is further increased.