3417 results about "Nitrogen source" patented technology

The invention provides a preparation method of a polygonatum sibiricum fermentation product, which comprises the following steps: A) pretreating a polygonatum sibiricum raw material, and mixing with water to obtain polygonatum sibiricum slurry; b) heating the polygonatum sibiricum slurry, mixing the heated polygonatum sibiricum slurry with a nitrogen source and a phosphorus source, and performing primary sterilization to obtain sterilized polygonatum sibiricum slurry; c) inoculating the sterilized rhizoma polygonati slurry with saccharomycetes, and fermenting to obtain fermentation liquor; d) adding a carbon source into the fermentation liquor, performing secondary sterilization, inoculating lactic acid bacteria, performing secondary fermentation, and performing third sterilization to obtain secondary fermentation liquor; and E) adding a compound enzyme into the secondary fermentation liquid for enzymolysis, then sterilizing for four times, and centrifuging to obtain the polygonatum sibiricum fermentation product. 3000 Da), a small molecule polypeptide (lt; the polygonatum kingianum fermentation product prepared by the method disclosed by the invention has the advantages that the conversion of polygonatum kingianum saponin can be promoted, the contents of diosgenin and trilliin are increased and calibrated, and the polygonatum kingianum fermentation product has the effects of improving the reaction capability and the exercise capability.

The invention discloses a microwave-assisted asphalt-based nitrogen-doped functionalized mesoporous carbon preparation method, which comprises: (1) carrying out crushing treatment on ash-removed refined coal liquefaction asphalt to obtain asphalt powder; (2) mixing the asphalt powder with a template agent and a nitrogen source, and carrying out microwave-assisted pre-oxidation treatment; (3) carrying out carbonization treatment on the pre-oxidized product; (4) adding an acidic solution into the carbonized product, and stirring and mixing to form slurry; then carrying out microwave-assisted pickling treatment on the slurry; (5) washing the acid pickling product until the pH value is neutral, and then carrying out drying treatment; and (6) activating the dried product to obtain the asphalt-based nitrogen-doped functionalized mesoporous carbon. According to the method, the carbonization temperature is reduced through the microwave-assisted technology, the specific surface area of the product is increased, the acid pickling process is simplified, and the problems that in the prior art, the pore structure of a mesoporous carbon material is prone to collapse and damage, and a template is not thoroughly removed can be effectively solved.

The invention relates to the technical field of microorganisms, and provides a low-temperature-resistant heterotrophic nitrification-aerobic denitrification pseudomonas and application thereof, the strain is pseudomonas (Pseudomonas sp.) SW1, and the preservation number is CCTCC (China Center for Type Culture Collection) NO: M 20221797. The low-temperature-resistant heterotrophic nitrification-aerobic denitrification bacterium Pseudomonas sp. SW1 has the characteristic of low temperature resistance, can well grow at 4-10 DEG C, and has relatively strong heterotrophic nitrification-aerobic denitrification nitrogen removal capability, and the enrichment culture of the strain is carried out in a relatively low nitrogen source, and the condition is extremely consistent with the application scene of the strain in domestic sewage.

The invention relates to small-particle-size spherical hexagonal boron nitride nano-powder and a preparation method thereof. The method comprises the following steps: uniformly mixing boric acid and a nitrogen source, adding borax, uniformly mixing, and treating the obtained mixture at 75-85 DEG C or 250 DEG C for 2-5 hours; the obtained precursor is subjected to ball milling and drying or freeze drying, and then the obtained ball-milled precursor is heated to 900 DEG C in a high-pressure nitrogen atmosphere at the heating rate of 3-5 DEG C / min and subjected to heat treatment for 0.5-3 h; and putting the obtained product into water at 80-90 DEG C, stirring for 5-8 hours, and then performing post-treatment to obtain the small-particle-size spherical hexagonal boron nitride nano-powder. The prepared spherical boron nitride powder has the advantages of small particle size, high specific surface area and high sintering activity or the prepared spherical boron nitride powder has the advantages of small particle size and high crystallinity, and the preparation method is low in energy consumption, green and efficient.

The invention relates to the field of agricultural soil improvement and ecological fertilization, and discloses an ecological fertilization method for improving the organic matter content of soil in a dry-hot valley region, and the method comprises the following steps: soil matrix improvement: improving the porosity and water binding capacity of the soil by adding charcoal and humic acid particles; the functional microbial preparation is put, and the activity of soil microorganisms is activated through the combined effect of cellulose decomposition bacteria, stabilization promoting flora and water retention flora; green manure crop planting and covering management: planting sweet clover and other leguminous crops to provide a carbon source and a nitrogen source for soil, and meanwhile, utilizing straw covering to inhibit water evaporation; turning over and stabilizing the green manure crops, namely turning over and stabilizing the organic matters in a blooming period of the green manure crops and combining with a stabilization promoting bacterial liquid and an adsorptive carrier; dynamic balance is maintained, and dynamic balance of decomposition, conversion and accumulation of organic matter is achieved step by step through multi-cycle planting and turning and pressing. The organic matter content and fertility of the soil can be improved, and the water-retaining property and microbial ecosystem of the soil are improved.

The invention relates to L-alanine, a preparation method and a fermentation device, and relates to the technical field of L-alanine. The culture medium contains a carbon source, a nitrogen source, a phosphorus source and trace elements; the L-alanine is synthesized by the microorganisms by controlling fermentation conditions and time; the invention further relates to an L-alanine preparation method, an L-alanine preparation device is adopted, the L-alanine preparation device comprises a fermentation tank and a stirrer for mixing a plurality of raw materials of L-alanine, and the stirrer is further provided with a treatment part for treating floating foam, oily substances and impurities generated in the stirring process. The processing part can collect floating foam on the surface of the mixed solution and can also collect impurities and oily substances in the mixed solution, and meanwhile an opening and closing door on the processing part can be opened and closed, so that the impurities difficult to capture in the mixed solution fluctuation state are collected in a unified mode; and the removal rate of floating foam and impurities is greatly improved.

The invention provides a doped electrode material based on porous silicon carbon and a preparation method thereof.The preparation method comprises the steps that a resin base material is smashed and then put into a high-temperature furnace to be subjected to a carbonization process, the carbonization temperature ranges from 300 DEG C to 1500 DEG C, an alkaline additive, a phosphorus source material and a nitrogen source material are sequentially added in the temperature interval, and phosphorus-nitrogen co-doped porous carbon is obtained; the preparation method comprises the following steps: mixing a silicon dioxide microsphere template into phosphorus-nitrogen co-doped porous carbon, adding a first coating carbon source to carry out first coating treatment, and etching the silicon dioxide microsphere template by using an etching solution to obtain a prefabricated object with a cavity structure; and putting the prefabricated object with the cavity structure into a fluidized bed reactor, introducing silicon source gas and a surface activation auxiliary agent, carrying out deposition at 400-550 DEG C, and then adding a second coating carbon source to carry out secondary coating treatment, thereby obtaining the doped electrode material based on porous silicon carbon. Therefore, the expansion coefficient of the electrode material is effectively reduced, and the rate capability is improved.

The invention discloses a tea fertilizer preparation method based on microbial fermentation, and particularly relates to the field of tea compost, tea waste is crushed and wetted, and a nitrogen source and trace elements are added to optimize the carbon nitrogen ratio, so that a foundation is laid for the fermentation process; then, selected microbial strains are proliferated and purified, and the treated waste materials are uniformly inoculated with the selected microbial strains; in the fermentation process, the stability of fermentation conditions is ensured by controlling the temperature and the humidity; the tannin concentration and the pH value are monitored in real time, when the tannin concentration exceeds a preset value and the pH deviates from a normal range, the abnormal state of tannin degradation is evaluated and identified through a reaction activity index, an interference source is positioned through a sparse principal component analysis algorithm, and noise signals are removed; and after the interference source is positioned, the fermentation condition is adjusted in a targeted manner, so that the tannin degradation efficiency reaches the expectation, and the compost is maturely fermented and meets the fertilizer use standard.

The invention discloses a land-sea system nitrogen and phosphorus pollutant collaborative source analysis method, and particularly relates to the field of environmental governance and water pollution traceability, which comprises a comprehensive method based on a multi-isotope tracer technology, an isotope mixed model and nitrogen and phosphorus molar ratio verification, and comprises the following steps: acquiring isotope characteristics of nitrogen sources and phosphorus sources in various forms of a land-sea system; in combination with hydrology and water quality monitoring data, the polymorphic contribution of river water, underground water, coastal terrestrial sources and estuary endogenesis to estuary nitrogen and phosphorus pollutants is quantitatively analyzed; through accurate calibration of underground water input, dynamic quantification of pollution flux and cooperative analysis of nitrogen and phosphorus pollutant sources, the problem of insufficient systematicness and accuracy in tracing of complex multi-source pollutants in the prior art is solved, and a basis is provided for drainage basin-estuary-bay integrated treatment.

The invention belongs to the technical field of microbial fermentation and food engineering, and discloses a fermentation method for enhancing the production capacity of schizochytrium limacinum phospholipid DHA and application, schizochytrium limacinum is subjected to fermentation culture for 32-60 h, and the addition of an organic nitrogen source and phosphate is optimized in the fermentation culture process; the formula of a seed culture medium for culturing schizochytrium limacinum is not changed, and only the formula of a fermentation culture medium for schizochytrium limacinum is changed. The invention provides a fermentation strategy for enhancing the production capacity of the schizochytrium limacinum phospholipid DHA, and the schizochytrium limacinum can obtain the phospholipid DHA with higher content by optimizing an organic nitrogen source and phosphate in a schizochytrium limacinum fermentation culture medium. According to the obtained schizochytrium limacinum grease, the total DHA content is obviously increased compared with that of a traditional fermentation strategy, and the proportion of phospholipid DHA is also remarkably increased. The regulation and control method is applied to preparation of schizochytrium limacinum algae powder, the schizochytrium limacinum algae powder rich in phospholipid DHA is obtained, and application of the schizochytrium limacinum algae powder in the field of aquatic feed is facilitated.

The invention discloses a synthesis method of amphiphilic quantum dots and application of the amphiphilic quantum dots in nano oil displacement, and belongs to the field of nano oil displacement. The synthesis method comprises the following steps: heating a mixture containing a carbon source and a nitrogen source in an air atmosphere for reaction, and centrifuging, filtering and drying a reaction product to obtain the amphiphilic quantum dots, the carbon source is selected from at least one of glucose, mannose, citric acid, lignin, chitosan and starch; the nitrogen source is selected from at least one of alkylamine, and the carbon chain length of the alkylamine is C6 to C12. The synthesis method is simple, heating of a high-pressure reaction kettle is not needed, the technological process is simple, and the method is suitable for large-scale industrial production; the series of amphiphilic carbon quantum dots show better solubility and higher absolute fluorescence quantum yield in water and various organic solvents.

The invention provides starch-based hard carbon and a preparation method thereof, a negative electrode plate, a sodium ion battery and electric equipment, and relates to the technical field of new energy. According to the preparation method disclosed by the invention, hydroxyl and hydrogen atoms in the starch are consumed through organic acid esterification, so that a molten state is not formed in the subsequent oxidation crosslinking and carbonization processes, the structure and strength of a carbon skeleton are improved, and functional groups and doped atoms are more easily introduced; in the oxidation cross-linking process, oxygen-containing functional groups mainly containing carbonyl are mainly introduced, and the cross-linking degree is enhanced, so that phosphorus and nitrogen atoms are better doped in subsequent carbonization, a better spherical structure is formed, and the subsequent carbonization yield is further improved. The starch-based hard carbon material prepared by the method has the advantages that the starch-based hard carbon material is mixed with the phosphorus source and the nitrogen source for carbonization, the pore-forming process and the phosphorus-nitrogen atom doping process can be directly completed in the heating process, and open pores are changed into closed pores in the high-temperature and constant-temperature process, so that the prepared starch-based hard carbon material has excellent structure and surface groups and heteroatoms, and the dynamic performance of the starch-based hard carbon material is further optimized.

The invention discloses a river nitrogen pollutant source analysis method based on drainage basin nitrogen turnover and isotope, and particularly relates to the technical field of water treatment.The river nitrogen pollutant source analysis method comprises the following steps that a drainage basin to be researched is selected, river water and soil samples in the drainage basin are systematically collected, and physical and chemical indexes and isotope indexes # imgabs0 # of the collected samples are tested. Nitrate marked by nitrogen isotope delta 15N / delta 18O and # imgabs1 # are used as key indication marks to perform high-precision identification on nitrogen sources in a river and an environmental system, the contribution proportion of different nitrogen sources to the nitrate concentration in a water body is quantified through a stable isotope analysis model, and the concentration of the nitrate in the water body is calculated. And in combination with data, the rates of denitrification and anaerobic ammonia oxidation in environmental samples, sediments and soil are directly measured through combined application of an isotopic tracer technology and a membrane inlet mass spectrometer technology.

The invention relates to a preparation method and application of a nitrogen-doped lignin carbon-based nonmetal catalyst, which comprises the following steps: carrying out high-speed ball milling treatment on industrial lignin of which the metal element content is not less than 20wt% and a nitrogen source, and carrying out high-temperature pyrolysis in an inert atmosphere to obtain the nitrogen-doped lignin carbon-based nonmetal catalyst. The pyrolysis temperature of the high-temperature pyrolysis is 750-900 DEG C, the ball milling rotating speed in the ball milling is 150-250 r / min, the ball milling time is more than 8 h, the agate balls comprise large agate balls, medium agate balls and small agate balls, the mass ratio of the large agate balls to the medium agate balls to the small agate balls is 1: 4: 1-1: 4: 4, the diameter of the large agate balls is 10-15 mm, the diameter of the medium agate balls is 4-6 mm, and the diameter of the small agate balls is 2-3 mm. The nitrogen-doped lignin carbon-based nonmetal catalyst is used as a solid base catalyst, the problem that lignin oxidative depolymerization depends on additional alkali at present is solved, mechanical force is adopted in the lignin depolymerization process to drive catalytic depolymerization of C-O / C-C bonds, high-temperature and high-pressure operation is avoided, and environmental protection and economical efficiency are achieved.

The invention provides a full-automatic vacuum oxygen-free oven, belongs to the technical field of wafer processing, and solves the problems that an existing wafer oven is low in feeding, discharging, heating and baking efficiency; and the automation degree is low. The full-automatic vacuum oxygen-free oven comprises an oven frame assembly, an EFEM frame assembly, two vacuum pump assemblies and four wafer loaders which are evenly distributed at equal intervals, four cavity assemblies and four automatic door assemblies are arranged in the oven frame assembly, and a robot transplanting assembly and a machine control box are arranged in the EFEM frame assembly. A main control computer is arranged on the left side of the EFEM frame assembly, the cavity assemblies are connected with the vacuum pump assemblies on the same side through exhaust pipelines, and the cavity assemblies are connected with an external high-purity nitrogen source. According to the invention, through cooperation of multiple sensors, mechanical linkage and a gas-liquid cooling system in the whole process, full-automatic stable grabbing and loading, vacuumizing treatment, heating, constant-temperature process baking treatment, dual-mode cooling and taking treatment of wafers in an oxygen-free and high-precision temperature control environment are realized.

The invention discloses a MoS2-coated porous M-N-C monatomic catalyst and an application thereof in a lithium air battery, the MoS2-coated porous M-N-C monatomic catalyst is prepared by the following steps: chelating transition metal ions through a chelating agent, anchoring the transition metal ions on a porous carbon carrier, mixing the transition metal ions with a nitrogen source precursor, and calcining to obtain a material which takes porous nitrogen-doped carbon as a carrier and loads a transition metal monatomic M, thereby obtaining the MoS2-coated porous M-N-C monatomic catalyst. And wrapping the layered MoS2 nanosheets through a hydrothermal vulcanization method and high-temperature calcination to obtain the target catalyst material. The obtained composite material has higher mass transfer efficiency, has higher oxygen reduction activity and stability in acidic and alkaline media, has lower overvoltage, high specific discharge capacity and excellent cycle performance when being used as a lithium air battery catalyst, and has better research prospects.

The invention relates to the technical field of biological medicine, in particular to a dynamic fermentation tank control system for producing a diabetes intestinal microecological regulating preparation. The system comprises a fermentation tank sensing feedback control network establishment module, a fermentation tank growth earlier-stage nutrition supply control module, a fermentation tank growth later-stage adjustment control module and a fermentation tank metabolism process environmental condition control module, and can generate an embedded sensing feedback control network by installing a sensor and being connected with a central feedback control system. The sugar source supply quantity, the nitrogen source supply quantity, the temperature, the pH value, the dissolved oxygen concentration and the oxygen and carbon dioxide gas proportional flow corresponding to the fermentation tank are synchronously monitored in real time, so that supply cooperative dynamic control and fermentation growth cooperative dynamic control are carried out, and meanwhile, metabolism environment condition cooperative dynamic control is carried out; therefore, the cooperative control work of the microbial growth environment conditions is executed. By optimizing environment control in the fermentation process, efficient production of the intestinal microecology regulating preparation can be achieved.

The invention provides a nitrogen-doped biomass-based fluorescent carbon quantum dot, a preparation method and application, and relates to the technical field of carbon nanomaterials, the method comprises the following steps: mixing a biomass material and deionized water under an ultrasonic condition, adding a nitrogen source, and carrying out ultrasonic dispersion to obtain a uniformly dispersed to-be-reacted solution; reacting the to-be-reacted solution at a preset temperature for a preset time to obtain a mixed product solution; and filtering and dialyzing the mixed product solution to obtain the nitrogen-doped biomass-based fluorescent carbon quantum dot solution. The nitrogen-doped biomass-based fluorescent carbon quantum dot prepared by the method shows a stable fluorescent effect and good water solubility, the free radical clearance rate can reach 90% or above, and the antibacterial rate can reach 99% or above. The method can be used in the fields of drug sustained release, bioimaging and the like.

The invention belongs to the field of material preparation and chemical engineering, and particularly relates to an N-doped modified MOFs (Metal-Organic Frameworks) derived core-shell nanoreactor as well as a preparation method and application thereof. The preparation method comprises the following steps: taking cobalt as a node metal, synthesizing an N-doped modified MOFs material with an organic ligand and a nitrogen source through a hydrothermal reaction, then coating the surface of the material with porous silicon dioxide, and preparing the N-doped modified MOFs derived core-shell nanoreactor through a two-step calcination method. The MOFs derived core-shell nanoreactor prepared by the invention has a large specific surface area, a rich pore structure and excellent catalytic activity and stability, and is high in catalytic activity, good in recycling stability and suitable for large-scale popularization and application when being used as a catalyst for alpha, beta-unsaturated aldehyde transfer hydrogenation.

In the system, an underwater double-bubble plasma generating device is electrically connected with a low-temperature plasma power supply, a pair of bubble reactors are arranged at intervals and at least partially immersed in a container, and a metal rod extends in a quartz tube through a positioning ring connected with a tube opening of the quartz tube; the metal rod is connected with a low-temperature plasma power supply; the gas channel introduces gas into the quartz tube through the positioning ring; the nitrogen source is communicated with one bubble reactor to introduce nitrogen through an air passage, the argon source is communicated with the other bubble reactor to introduce argon through an air passage, and when voltage is applied to the two metal bars of the pair of bubble reactors, the two bubble reactors discharge simultaneously to generate plasmas so as to generate NO2-and H2O2 active particles respectively; nO2 <-> and H2O2 active particles react to generate ONOO <->, and the sterilization and disinfection functions of the plasma activated water are enhanced based on a chemical path of the system.

The invention provides a fermentation medium for efficiently producing lipopeptide by bacillus subtilis as well as application and a method of the fermentation medium. Each liter of the fermentation medium comprises 20-60g of a carbon source; 5-10 g of a nitrogen source; 1-5g of corn steep liquor dry powder; 1 to 5g of monopotassium phosphate; 1 to 5g of disodium hydrogen phosphate; 0.1 to 0.5 g of magnesium sulfate; 5 to 10 mg of calcium chloride; 5 to 10 mg of manganese sulfate; 5 to 10 mg of ferrous sulfate; and vegetable oil with a volume fraction of 1-5%. The carbon source is selected from at least one of glucose, maltodextrin and brown sugar; the nitrogen source is selected from at least one of diammonium hydrogen phosphate, sodium nitrate and urea; the vegetable oil is selected from at least one of soybean oil and corn oil. Bacillus subtilis with the volume fraction of 1-5% is inoculated into a fermentation culture medium for fermentation and fed-batch culture, and the yield of lipopeptide reaches 48.58 g / L. The method improves the lipopeptide production capability of the bacillus subtilis while eliminating foam, and is suitable for large-scale production and application.

The invention discloses a high-dispersion nitrogen-doped copper-based catalyst and a preparation method and application thereof.The catalyst is composed of a carrier and an active metal component loaded on the carrier, the carrier of the catalyst is composed of a carbon source and a nitrogen source, and the active metal component is copper; when the carbon source and the nitrogen source are combined to serve as the carrier, copper ions can be complexed with functional groups rich in the carrier, meanwhile, copper is fixed, further growth of copper nanoparticles is inhibited, and therefore the dispersity of copper in the catalyst is improved; the catalyst has high catalytic activity when applied to catalysis of methanol liquid-phase reforming hydrogen production reaction, can reduce the temperature of liquid-phase hydrogen production reaction and ensure that the hydrogen production rate is not lower than 97.70 [mu] mol H2 / gcat / s, the content of carbon monoxide in the product is not higher than 0.0845%, the content of methane is not higher than 0.0034%, and the hydrogen selectivity is high.

The invention discloses a Burkholderia sp. Strain and an application thereof in prevention and treatment of eucalyptus blight. The Burkholderia sp. AS-SF-1 disclosed by the invention has the preservation number of GDMCC (Graphical December Microorganism Center) No. 66223; the culture and volatile matter of the strain can inhibit growth of various forest pathogenic bacteria, the eucalyptus has a remarkable control effect on branch blight, siderophore can be generated, absorption and utilization of iron can be promoted, various types of carbon sources or nitrogen sources can be utilized, and the strain can grow within the pH range of 4-9. The burkholderia sp. AS-SF-1 disclosed by the invention has an important application value on planting of eucalyptus and prevention of diseases.

The invention provides a B / N co-doped high-graphitization-degree artificial graphite negative electrode material and a preparation method thereof, and the preparation method of the artificial graphite negative electrode material comprises the following steps: crushing raw material coke to obtain primary particles, and then mixing, granulating and shaping to obtain secondary particles; fully mixing the obtained secondary particles with an organic nitrogen source, and then pre-carbonizing to obtain a nitrogen-doped precursor; and fully mixing the obtained nitrogen-doped precursor with an organic boron source, and then carrying out secondary carbonization, shaping and graphitization to obtain the B / N co-doped high-graphitization-degree artificial graphite negative electrode material. The artificial graphite negative electrode material disclosed by the invention has high energy density and high rate performance, and meanwhile, the first efficiency can also be improved.

The invention provides a method for preparing a nitrogen-rich liquid fertilizer and a soil conditioner from agricultural biomass wastes, and belongs to the technical field of humic acid synthesis. According to the agricultural biomass waste treatment method, nano-bubble nitrogen sources are coupled with agricultural biomass waste for a hydrothermal reaction, and the nitrogen sources in the method serve as additives to provide nitrogen elements to improve the quality of humic acid and serve as catalysts to improve the yield; by adopting a nano bubble solution system, the contact area of a nitrogen source, agricultural biomass waste and water is increased, and the yield and quality of a product are improved. According to the method disclosed by the invention, the quality and yield of humic acid and hydrothermal carbon are improved, the content of nutrient elements such as nitrogen element in the product is increased, the problems of low nitrogen fertilizer utilization rate, single returning nutrient of fulvic acid, humic acid or hydrothermal carbon and the like are solved, and a new thought is provided for resource utilization of agricultural biomass wastes such as straws and the like.

The invention discloses a synthesis method and application of an iron-aluminum co-doped catalyst, and the synthesis method is characterized by comprising the following steps: S1, dissolving an aluminum metal salt and an iron metal salt in a beaker containing deionized water to obtain a solution A; s2, adding a phosphorus source into the solution A, and adjusting the pH to form a turbid liquid B; s3, biomass is added into the turbid liquid B to be stirred for 30 min, and a solution C is obtained; s4, adding a nitrogen source into the solution C, and drying the beaker in a water bath kettle; mixing the obtained dried product with an activating agent, and calcining under inert gas to obtain a catalyst crude product; and S5, grinding the catalyst crude product, washing with ethanol and deionized water, and carrying out vacuum drying to obtain the iron-aluminum co-doped catalyst. The preparation method is simple and low in equipment requirement. The invention discloses a novel nitrogen-doped carbon-coated zero-valent iron nanoparticle catalyst which can degrade pollutants by utilizing electron transfer of the pollutants and the catalyst under the condition of adding any oxidizing agent. Under the neutral room temperature condition, the catalyst has a very good removal effect on degradation of organic pollutants which are difficult to biodegrade, has very good stability, and is low in iron ion dissolution rate.

The application discloses a kind of traditional Chinese medicine rose flower fermentation method and fermentation composition, it is related to fermentation technical field.The traditional Chinese medicine rose flower fermentation method includes: traditional Chinese medicine rose flower is crushed, mixed with water, and after sterilization, fermentation base material is obtained, yeast peptone solution is added, as blank fermentation pre-liquid;Activated rhamnolipid lactose casein bacillus liquid is inoculated in blank fermentation pre-liquid, and fermentation is carried out.The traditional Chinese medicine rose flower fermentation method provided by the application uses traditional Chinese medicine rose flower as raw material, and utilizes activated rhamnolipid lactose casein bacillus liquid to ferment, without adding exogenous sugar in the fermentation process, but before fermentation, yeast peptone is added first, the addition of yeast peptone can supplement nitrogen source for the fermentation process of subsequent activated rhamnolipid lactose casein bacillus liquid, so that the nutrient content of fermented rose flower is more, and component conversion is more thorough.It is favorable to improve the DPPH free radical scavenging rate, total phenol content and antioxidant property of fermentation composition.

The invention discloses a mother strain culture medium for boletus xylophilus as well as a preparation method and application of the mother strain culture medium, and belongs to the technical field of microbial culture. The preservation number of the strain JSJ-Bx1 of the boletus sinensis mother strain is CGMCC (China General Microbiological Culture Collection Center) No.42007, and the strain JSJ-Bx1 is preserved in the China General Microbiological Culture Collection Center; the culture medium is prepared from 10-30 g of a carbon source, 2-6 g of a nitrogen source, 1-3 g of inorganic salt, 0.1-0.3 g of a growth factor suitable for the culture medium, 20 g of agar and 1 L of water, and the pH of the culture medium is 4-6. By the adoption of the culture medium, hyphae of the boletus sinensis mother strain grow fast, grow vigorously and are dense, the edges of bacterial colonies are neat, hypha degeneration phenomena such as pigment and water spitting are avoided, and the mother strain culture growth cycle is greatly shortened.

The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution, a precipitator and a complexing agent, and carrying out coprecipitation reaction on an obtained coprecipitation reaction precursor solution to obtain a lithium-rich manganese-based precursor; the metal salt solution comprises a manganese element, a cobalt element and a nickel element; and mixing the lithium-rich manganese-based precursor, a lithium source, an auxiliary agent and a dispersing agent, and calcining to obtain the lithium-rich manganese-based positive electrode material, the auxiliary agent comprises a nitrogen source or a nitrogen source and a carbon source. The first discharge specific capacity, the rate capability and the cycling stability of the lithium-rich manganese-based positive electrode material can be improved, and the problems of capacity fading, discharge voltage drop and dynamic delay in an electrochemical reaction process are solved.

The invention belongs to the field of new energy materials and devices, and particularly discloses nitrogen self-doped phenolic resin-based hard carbon microspheres and a preparation method and application thereof.The preparation method comprises the following steps that nitrogen-containing phenol monomers, aldehyde monomers and a basic catalyst are mixed according to a certain sequence, and after prepolymerization is conducted at the low temperature, the nitrogen self-doped phenolic resin-based hard carbon microspheres are obtained; carrying out high-temperature hydrothermal reaction to obtain phenolic resin microspheres; and sequentially carrying out low-temperature carbonization treatment and high-temperature carbonization treatment to obtain the nitrogen self-doped phenolic resin-based hard carbon microspheres. Compared with the existing nitrogen-doped resin hard carbon preparation method, the nitrogen-self-doped phenolic resin hard carbon has the advantages that a nitrogen source is introduced into the phenolic resin hard carbon from the source end of the resin, the production process is simplified, and uniform distribution and atomic-scale doping of the nitrogen element are realized. The material is used for sodium ion batteries, has excellent long cycle stability, good rate capability and high specific capacity, and has industrial application prospects.