105 results about "Structural diversity" patented technology

The invention belongs to the field of super capacitors and particularly relates to a binary metal organic framework material applied to a super capacitor and a preparation method for the binary metal organic framework material. The binary metal organic framework material is formed of two types of metal ions and an organic ligand using a solvothermal method in a self assembly coordination manner. The two types of metal ions are Co-Ni, Co-Fe, Co-Mn, Ni-Mn or Ni-Cu. The organic ligand is trimesic acid, terephthalic acid, 2,6-naphthalene acid, 4,4'-biphenyl diacid or 2-methylimidazole. The binary metal organic framework material is advantaged by having multiple holes, large specific surface area and an adjustable structure, and being varied in structure. The cooperative effect between the two types of metal ions in the binary metal organic framework material (MOFs) is utilized, so that when the binary metal organic framework material is applied to the electrode material of a super capacitor, excellent cycling stability and high specific discharge capacity are achieved.

The invention relates to a load balancer, a load balancing method and a stratified data center system. The load balancer is used in the stratified data center system which is formed by connecting a plurality of data centers in a stratified mode, and is used for distributing flow of a present data center load which is transmitted to the data centers and corresponds to the load balancer. The load balancer is used for distributing the load flow transmitted to the present data centers according to the resource using state of the present data centers and the resource using state of the lower layer data centers. According to the load balancer, the load balancing method and the stratified data center system, structural diversity and flexibility of the stratified data center system can be improved, the data center with the position close to a user and with spare resources is selected as far as possible to process the request of the user according to the resource using state of the data centers by which the stratified data center system is formed, load of the stratified data center system can be balanced, response speed of a user request is improved, and service efficiency of the stratified data center system is improved.

The invention discloses graphene activated metal organic framework electrode material and preparation and applications thereof. The preparation method comprises the steps that soluble salt containing metal ions and organic ligands are added in a solvent, and reaction temperature is controlled within 100 DEG C-150 DEG C and maintained for 24h-30h so that MOF structural material is obtained; and the MOF structural material is ultrasonically dispersed in the solvent and then graphene is added, and reaction is performed for 10-60min so that the graphene activated MOF electrode material is prepared. The metal organic framework material has the advantages of being porous, high in specific surface area, adjustable in structure and diverse in structure and is simple in the material preparation process; and the metal organic framework material has excellent cyclic stability and high specific discharge capacity when the metal organic framework material is applied to superconductor electrode material, and specific capacitance is 280F / g and thus stability is great.

The present invention relates to the field of industrial robot manufacturing and intelligent applications, in particularly to a self-assembling system for industrial robots. The system comprises a mechanical part and a control part. The mechanical part comprises an assembly robot, a tightening, a bolt-screwing robot, a clamping mechanism, a nail-screwing device and an assembly platform. The assembly robot, the bolt-screwing robot, and the assembly platform are fixed on a same datum plane. The tail end of the assembly robot is provided with the clamping mechanism. The tail end of the bolt-screwing robot is provided with a nail-screwing device. The control part comprises a robot controller, a visual controller, a visual camera, a driver, a motor, a coded disc and a force sensor. The self-assembly system is capable of automatically recognizing posture deviations of assembly parts during feeding and automatically adjusting postures during assembly according to force feedback information such that complicated parts can be intelligently grabbed and flexibly assembled. The self-assembling system for industrial robots can be used for high-precision assembly occasions of diversity of more structures.

The invention discloses a lignin degradation solution and a preparation method thereof as well as a method for degrading lignin by using the lignin degradation solution, and belongs to biochemical and bio-refinery methods to solve the problem that the efficient biodegradation of lignin is difficult to realize by adopting single ligninase of laccase at present. The lignin degradation solution is prepared by the following steps: dissolving laccase and manganese peroxidase into an acetic acid-sodium acetate buffer solution of which the pH value is 4-6 in an enzyme load ratio of (10:1)-(1:5) to ensure that the enzyme loads of the laccase and manganese peroxidase are respectively 1U / ml-50U / ml and 1U / ml-50U / ml; and then adding 1-10mM of MnSO4 and 0.1-1mM of H2O2, wherein the laccase and manganese peroxidase are obtained by fermenting white rot fungi to obtain extracellular crude enzyme liquid and then performing separation and purification respectively. According to the lignin degradation solution and the methods disclosed by the invention, the synergistic oxidative degradation of macromolecular lignin with rich structural diversity is realized, and compared with a degradation reaction system with single ligninase, the degradation rate of the macromolecules of the lignin can each 30-50%, the degradation conversion efficiency is significantly improved, and the degradation solution and the methods can be applied to the fields of bio-refinery of lignocelluloses, biological pulping or environmental treatment and the like.

The invention relates to a real-time online multi-target tracking method adopting a temporal dynamic appearance model. The method comprises the following steps: taking appearance information of each target in a multi-target tracking process as an appearance sequence of temporal orderliness; expressing the temporal dynamic variation characteristics of the appearance sequence by establishing an appearance model with strong discriminating ability by considering the rule of change of the target appearance information in the tracking process following the change of time; supplying accurate appearance matching information related to the data between target and detection results through structural diversity of the modeling of hidden state observation models in a characteristic space; relating the detection results with the target frame by frame, thereby finishing the real-time online multi-target tracking task and accurately real-time tracking a plurality of interesting targets in a tracking video. The tracking property is ensured while calculation efficiency is ultra-high. The real-time online multi-target tracking method can be practically applied to various real-time systems.

The invention relates to a method for studying the structural diversity of a daqu bacterial community, i.e. the denaturing gradient gel electrophoresis (DGGE) technology, which belongs to the technical field of microbial ecology and mainly comprises the following steps that: 1), daqu genomic deoxyribonucleic acid (DNA) is directly extracted; 2), bacterial universal primers are selected, and specific DNA fragments in the bacterial ribosome DNA are amplified; 3), polymerase chain reaction (PCR) products are separated through DGGE; 4), corresponding strips of microbes in the DGGE fingerprint map are recovered in a gel cutting way; 5), PCR is carried out again, products are connected to a T carrier, the blue and white spot screening is carried out, and positive clone verification is carried out; and 6), the species information of the corresponding microbes of the DGGE strips is obtained through the sequence test. The method does not rely on the molecular biology technology of the traditional culture method, has the characteristics of sensitivity, convenience and accuracy and solves the difficult problems to study some microbes incapable of being cultured or difficult to culture, and the method provides the technical basis for the verification of the daqu bacterial community structure and the discovery of new wine brewing microbes or functional microbes.

The invention belongs to the construction method of a deep foundation pit of industrial construction, particularly relates to a reverse operating construction method of a round deep foundation pit concrete piling support and a main structure and solves the problem that the existing construction method of the deep foundation pit is not suitable for complex geological condition and the construction cost is too high. The construction method comprises the following steps: the center of the foundation pit is adopted as the center and the outer sides of the position of the main structure are respectively distributed with pilings; the top parts of the pilings are poured with crown bore beams which connects the top parts of the pilings into one body; the first section of the foundation pit is excavated, reverse operation is carried out to the outer layer of the first section of the main structure; the outer layer of the first section of the main structure and the pilings are integrated by the crown bore beams so as to form a primary support of the foundation pit; the foundation pit is excavated by sections, reverse operating construction of the outer layer of the main structure is carried out by sections, which form a foundation pit support together; and normal operating construction is carried out to the inner layer of the main structure. The invention is applicable to poor geological condition and is particularly applicable to structural diversity of the soil layer in the depth range of excavation of earthwork, thus ensuring the stability of the soil body of the main structure in the construction period, greatly reducing the cost of construction measures and improving the construction speed.

The invention discloses a knowledge map distributed representation method capable of encoding relationship semantic diversity structure, From the point of view of graph structure diversity in knowledge map, mining and summarizing the subgraph structure which contains abundant semantic information, and connecting the subgraph structure with the related semantic information, such as reflexivity, symmetry, transitivity and so on; The method of the invention can better encode the diversity of the graph structure, Therefore, it can better capture the semantic information in the knowledge map, achieve better completion and prediction effect, achieve better performance in the link prediction task, and has a strong scalability, which has a good practical value for the application of the semantic diversity structure of encoding relations in the distributed representation of the knowledge map.

The invention discloses a method for extracting total DNAs of soil microorganisms at high purity. CTAB (Cetyltrimethyl Ammonium Bromide), lysozyme, protease and SDS (Sodium Dodecyl Sulfonate) act together to perform lysis of cells and simultaneously freeze and thaw the cells repeatedly; therefore, an excellent cell lysis effect is achieved; the humic acid is removed by utilizing PVP (Polyvinyl Pyrrolidone), CaC12 and BSA (Bull Serum Albumin); and the DNAs are precipitated by utilizing isopropanol so that the purity of the obtained DNAs is high. The method is simple and convenient; and without being purified, the DNAs obtained by the method can be used for subsequent PCR (Polymerase Chain Reaction) analysis and DGGE (Denaturing Gradient Gel Electrophoresis) analysis. The purity of the extracted DNAs meets the requirement for directly performing subsequent molecular biological research; the extracted DNA segments can be subjected to 16SrDNA amplification and DGGE atlas analysis; glue cutting recovery and basic group sequencing can be performed on specific stripes of the DGGE band; unknown bacteria can be identified through comparison with the conventional sequences in an RDP (Ribosomal Database Project) database or by establishing a new sequence probe; and therefore, the structural composition of the microbial community can be determined, and a foundation can be laid for researching the structural diversity and ecological functions of the soil microorganisms in the rhizosphere of the mulberry in future.

The invention discloses a method for extracting total DNA (deoxyribonucleic acid) of mulberry rhizosphere soil microorganisms by adopting a plurality of measures, which can achieve a good cell lysis effect by utilizing PVP (polyvinyl pyrrolidone) prewashing to remove humic acid, the synergy of CTAB (cetyltrimethyl ammonium bromide), lysozyme, protease and SDS (sodium dodecyl sulfate) to lyse cells and repetitively freezing and thawing the cells at the same time and utilizes PEG8000 to precipitate DNA, so that the purity of the obtained DNA is high. The adopted method is simple and convenient, and the DNA can be used in subsequent PCR (Polymerase Chain Reaction) analysis and DGGE (denaturing gradient gel electrophoresis) analysis without needing to be purified. The extracted DNA is so pure as to meet the requirement of direct subsequent molecular biology research, an extracted DNA fragment can be used in the amplification and DGGE map analysis of 16SrDNA, moreover, the specific band gel extraction and base sequencing of a DGGE band can be carried out, comparison with the sequence existing in an RDP (ribosomal database project) database can be carried out, or a new sequence probe can be established to identify unknown bacteria, so that the composition of a microbial community structure can be determined, and thereby laying a foundation for the future research of the community structure diversity and the ecological functions of the mulberry rhizosphere soil microorganisms.

The invention discloses a method for decolorizing and adsorbing a dye in water by using a zeolite-like imidazate framework material, relates to application of a decolorizing and adsorbing material in decolorization and adsorption of a dye in water, and belongs to the field of environment-friendly technology application. The method is characterized in that: the dye in the water is adsorbed by adopting the ZIFs material with structural diversity, large pore volume, high specific surface area and relatively high chemical and thermodynamic stability; the material has the characteristics of high yield, controllable shape and diverse structure and function change; and the ZIFs material of different structure is selected according to different dye molecules so as to achieve ideal decolorizing and adsorbing effects. The concentration and the color degree of the filtrate treated by the method are obviously reduced, the decolorizing rate can reach over 95 percent, the color degree can be reduced by 50 to 95 degrees, and the desorption rate reaches over 90 percent; and the ZIFs material can be circularly used in adsorption treatment of the dye, avoids secondary pollution of the water body and belongs to an environment-friendly sewage treatment material.

The invention relates to a hydrophobic oil-resistant flame-retardant anticorrosive multifunctional coating and a preparation method and belongs to the field of material surface modification. Specifically, fluorinated polyphosphazene elastomers of different fluorine element contents are prepared, and the comprehensive performance of the coating material can be greatly improved by using low-temperature resistance, structural diversity, good solubility and workability of the fluorinated polyphosphazene elastomers and further adding functional fillers such as a reinforcer, an activating agent anda vulcanizer into a fluorinated polyphosphazene system; and the obtained coating material can be applicable to a variety of surface forming methods of paster, spray-coating, electrostatic jetting, sol-gel, phase separation and the like, hydrophobic oil-resistant anticorrosive coatings of surfaces of metallic and macromolecular materials can be prepared by using the methods, and meanwhile, the flame retardance of the macromolecular materials is improved. According to the hydrophobic oil-resistant flame-retardant anticorrosive multifunctional coating and the preparation method, the process is simple and pollution-free, the fluorine content and functionality of the material can be adjusted through lateral group selection during synthesis, and thus, the good interface and hydrophobic and oil-resistant integrated high performance of the coating are achieved.

The invention discloses a synthetic method of an alpha, beta-diamino acid derivative. In the method, a one-step reaction is undergone by taking a diazo compound, aniline and aldehyde acid ester as raw materials, taking metal Lewis acid and chiral phosphoric acid as catalysts, taking an organic solvent as a solvent and taking a 4 Angtrom molecular sieve as a water absorbing agent, so that the alpha, beta-diamino acid derivative is obtained. The synthetic method disclosed by the invention has the advantages of high atom economy, high selectivity and high yield, the reaction conditions are mild, and operation is easy and safe. The alpha, beta-diamino acid derivative has anticancer activity and structural diversity, and is suitable for preparing and applying antitumor, antibiotic and antifungal medicaments.

The invention discloses a method for measuring the diversity of forest structure based on the relationship between adjacent trees, which comprises the following steps: 1. Based on the spatial structure parameters of forest based on the relationship of adjacent trees, combining the tree species in the structural unit to carry out multi-parameter combination, and establishing the classification of the type of the spatial structure unit of forest; 2. 2, establishing a diversity model of forest space structure unit; 3, establishing a forest structure diversity model; 4, verifying that measured stand; 5, simulating that verification of the management forest. The invention has the advantages that: 1, the newly constructed diversity index of forest structure can simultaneously integrate the diversity of tree species, the position of forest trees and the size differentiation of forest trees into one index. 2. The index can be used to guide the stand structure adjustment, and it has very important application value to cultivate and manage the target trees. 3, data is conveniently acquired.

The invention provides an O-glycoside nitrone compound which is a novel nitrone glycoside and a synthetic method thereof, belonging to the field of chemical synthesis. The compound is synthesized by the following steps of: firstly catalyzing sugar and acetic anhydride with acid to produce totally acetylated sugar; then reacting the totally acetylated sugar with red phosphorus and liquid bromine under an acidic condition to generate brominated sugar; then reacting the brominated sugar with hydroxyl-contained aromatic aldehyde under the action of a phase transfer catalyst to produce O-benzaldehyde glycoside; and finally reacting the O-benzaldehyde glycoside with N-substituted hydroxylamine to obtain a target product. The O-glycoside nitrone compound has single beta-form configuration and simultaneously has the advantages of natural chirality, structural diversity and the like. The synthetic method has the advantages of low price and easy obtained raw materials, environmental protection, reproducibility and the like and creates a good condition for industrialization.

The invention relates to a fully automatic lumbar vertebral image segmentation method based on pre-emphasis strategy, The method comprises the following steps: a data generation method based on humanlumbar vertebrae structure and magnetic resonance contrast characteristics automatically generates a large number of spine magnetic resonance images with rich structural diversity and texture diversity of the spine, and completes the training of the lumbar vertebrae image segmentation model; Using the trained segmentation model, the automatic segmentation of vertebral body and intervertebral discin spinal MRI data is realized. The invention can solve the problem of the limitation of the data of the traditional training model, and has high model generalization ability. There are many kinds oflumbar magnetic resonance images which are adaptable to different hospitals, different scanning machines and different scanning parameters.

The invention provides a pixel structure, a display substrate, a display device and a display method. The pixel structure comprises a plurality of pixel units; each pixel unit comprises a diamond sub-pixel and four congruent hexagonal sub-pixels; wherein the four congruent regular hexagonal sub-pixels are arranged around the diamond sub-pixel. Different from conventional pixel structures only including rectangular sub-pixels, the pixel structure in embodiments of the invention can satisfy requirements for pixel structure diversity. Besides, Cooperation of regular hexagonal sub-pixels and diamond sub-pixels is higher in utilization of the area, so that the aperture ratio and the brightness of unit area of the display device with the pixel structure can be increased.

The invention provides a chiral quaternary phosphonium salt phase transfer catalyst, a preparation method and application thereof. The catalyst is prepared from natural amino acid as the starting rawmaterial, has wide raw material sources, and is simple in synthesis. The catalyst has a plurality of modification sites, structural diversity and strong controllability, also has multiple hydrogen bond donor sites, has strong chiral induction catalytic ability, at the same time has stability to air and water, is easy to store, has good water solubility, is environment-friendly, and has strong practicability and industrial application value.

The invention discloses a ketene triazole compound and a synthesis method thereof. The structural formula of the compound is disclosed in the specification. Alkyl or aryl azide and various substituted 2-furancarbinol used as initial raw materials are subjected to Lewis-acid-promoted [3+2]-cycloaddition / furan ring opening cascade reaction to generate a (E)-configuration 1,2,3-triazole and ketene / aldehyde conjugated skeleton structure. The method is simple to operate, the reagent is the low-cost Lewis acid, and the substrate has wide application range; and thus, the method can be used for synthesizing a series of high-functional-group substituted complex ketene triazoles, and has the advantages of high economical efficiency of steps, diversified product structures and stereospecificity of (E)-configuration.

The invention discloses a reinforced type stereoscopic member which comprises a plurality of frames. Each frame is a polygonal frame with a separation net structure. The frames are connected with one another to form a stereoscopic component. A reinforcing body is arranged in the stereoscopic component. The reinforcing body comprises a fixed part and a plurality of supporting columns. One end of each supporting column is detachably connected with the fixed part, and the other end of each supporting column is connected to the corresponding vertex angle of the stereoscopic component. Stereoscopic components of different structures are assembled according to the frames in different shapes, shapes and structures are diversified, and the structure is more stable and firmer. The stereoscopic component is easy to dismount and fold. The reinforcing body and the stereoscopic component can be dismounted and separated, so that transportation is facilitated. Stone or other heavy articles are arranged in the stereoscopic member so that the stereoscopic member can be applicable to constructing a flood control dam, a temporary barrier, a supporting body and the like. The stereoscopic member is high in anti-pressure capacity and pressure bearing capacity and is widely used.

Disclosed are a hydroxyproline peptoid derivative and a preparation method and application thereof. With biphenyl pyridine as a hinge region binding fragment, by adopting a design strategy of a fragment drug and introducing L-hydroxyproline as a flexible Linker, a peptoid micromolecule-like compound library with kinase inhibition activity is constructed, and through screening of ADP-Glo and otheractivity tests, a peptoid tyrosine-like kinase inhibitor which has Bcr-Abl kinase inhibition activity and prevents the proliferation of tumor cells is found. The compound can be used for preparing anti-tumor drugs and has the activity of inhibiting Bcr-Abl and Bcr-AblT315I kinases and activity of inhibiting the cell proliferation of K562 cells. By introducing the L-hydroxyproline, the structural diversity of the Bcr-Abl inhibitor is expanded, the activity result shows that the introduction of proline has a certain effect on the inhibition activity of the compound, and the proline can serve asa novel pharmacological-effect fragment of the Bcr-Abl tyrosine kinase inhibitor.

The invention provides a resonance transformer structure, which comprises a first winding base, a primary winding, a plurality of secondary windings and a magnetic core group, wherein the first winding base comprises a body and a channel, wherein the channel passes through the body; and the body is provided with a first winding zone and a plurality of second winding zones of single grooves; the first winding zone is provided with a plurality of lead pins; the plurality of second winding zones of the single grooves are arranged at the two sides of the first winding zone; the primary winding iswound on the first winding zone of the first winding base, and is connected with the plurality of lead pins; the plurality of secondary windings are respectively wound on the plurality of second winding zones of the single grooves on the first winding base; and a part of the magnetic core group is arranged in the channel of the first winding base. The resonance transformer structure can enhance current transfer power, and reach the purpose of stably controlling a leakage inductance value; and meanwhile, the volume of the resonance transformer is thinned. In addition, the output voltage of theresonance transformer can be increased, thus being high in structure diversity, reducing manufacturing cost, and the like.

The invention discloses an alkenyl amide triazole compound and a synthetic method thereof. The compound has the following structural formula (see the formula in the description). According to the synthetic method, alkyl or aryl azide, various kinds of amine and various substituted 5-halogeno-2-furfuryl alcohol compounds are used as starting raw materials, and a 1,2,3-triazole and alkenyl amide conjugated skeleton structure of (Z)-configuration is generated through a [3+2]-cycloaddition, furan ring opening and amidating series reaction accelerated by lewis acid. The synthetic method is easy to operate, the used reagent is the low-cost lewis acid, the substrate is wide in application range and capable of being used for synthesizing a series of complex alkenyl amide triazole compounds substituted by functional groups highly, and step economy, product structural diversity and (Z)-configuration stereospecificity are high.

The invention discloses chiral leucine ion liquid. The chiral leucine ion liquid consists of a cation [C]<+> and a chiral leucine ion [A]<-> and has a structural formula, namely [C]<+> [A]<->, wherein the [A]<-> is a chiral L-leucine anion or a chiral D-isoleucine ion; and the cation [C]<+> is imidazoles, an N-alkyl pyridine cation, a quaternary ammonium compound cation, a quaternary phosphonium salt cation or an N,N-dialkyl pyridine cation. The invention provides ion liquid with chiral position on the cation and the cation has more structure and property design freedom degrees, so the chiral leucine ion liquid has structural diversity and designability. The chiral leucine ion liquid of the invention has the advantages of ion liquid, such as nearly nonvolatile property, no toxicity, wide liquid temperature range and the like, and has the chiral characteristics of chiral substances, such as high selectively, chiral induction effect and the like.

The invention relates to carboxylic acid derivatization beta-carboline and a preparation method of the carboxylic acid derivatization beta-carboline. The method comprises the steps that organic solvent is added into the mixture of 6-methyl-beta carbazoline, metal-salt catalyst and initiator, oxygen is introduced, and after stirring reaction is conducted, the reaction is terminated; filtering is conducted, and solid crude products are collected; further purification of the crude products is conducted through recrystallization and silica gel column chromatography to obtain products. According tothe method, reaction conditions are mild, the application range of substrates is wide, and a large number of beta-carboline derivatives with diversified structures can be obtained.

The invention relates to a novel synthetic method for beta-amino acids and the beta-amino acids synthesized by adopting the method. The method comprises the following steps: an amide and an azo diacidester are taken as raw materials, an intermediate compound I is synthesized through direct carbon-hydrogen bond amination under the action of a catalyst, the intermediate compound I reacts with methyl bromoacetate to synthesize an intermediate compound II, an amide protecting group is removed under acidic conditions, and therefore the beta-amino acid is obtained; and the chemical structural formula of the beta-amino acid obtained by synthesis is shown in the description, wherein in a formula, R1 and R2 are separately one selected from the group consisting of hydrogen, alkyl, branched alkyl, cycloalkyl, aryl, aryl with various substituents, a heterocyclic group and a heterocyclic group with various substituents; and R3 is an ester group. Compared with the prior art, the method provided bythe invention synthesizes the intermediate compound I through the direct carbon-hydrogen bond amination process, so that substrates can be broadened in a wide range, the synthesized beta-amino acids with substituents in alpha and beta positions have structural diversity, and therefore the method provides a novel method for the industrialized production of the beta-amino acids with the substituentsin the alpha and beta positions.

The invention discloses membrane assembly performance detection equipment which comprises a raw water tank, a raw water pump, a core type filter, a high pressure pump, a reverse osmosis membrane system and a clean water tank. The reverse osmosis membrane system comprises at least two membrane assemblies. According to set technological matching requirements, the membrane assemblies can be configured into a one-stage one-section type or a one-stage multi-section type or a mixed section type formed by mixing the one-stage one-section type and the one-stage multi-section type, so that the membrane assembly performance detection equipment can carry out different technological matching tests on the membrane assemblies, the problem that existing membrane assembly performance detection equipment has a single structure and can only carry out performance detection tests on one membrane assembly is solved, and the structural diversity and applicability of the membrane assembly performance detection equipment are improved.

The invention discloses a detection method of city wastewater treatment plant / station microbial aerosol. The detection method includes the steps of firstly, using a medium-flow portable atmosphere sampler to collect the microbial aerosol of city wastewater treatment plant / station test points, and collecting and sampling the meteorological parameters at the moment; secondly, eluting particles on a sampling membrane, and extracting the total DNA of the particles; thirdly, performing target fragment amplification and high-throughput sequencing; fourthly, performing sequence analysis to identify the community structure of the microbial aerosol; fifthly, analyzing the diversity and similarity of the community structure of the microbial aerosol; sixthly, analyzing the dissipation features and sources of the microbial aerosol. The method is a feasible method for extracting trace DNA in the city wastewater treatment plant / station microbial aerosol, and a fundamental premise and foundation is provided for the analysis of the dissipation features and diversity of the microbial aerosol.

The invention discloses a strain of bacillus cereus which is preserved in China General Microbiology Center of Committee for Culture Collection of Microorganisms since 31st December, 2014, and the preservation number is CGMCC No. 7069. The bacillus cereus L90 provided by the invention is capable of improving the drought resistant capability of juglans regia. Experiment research shows that after the bacillus cereus provided by the invention is inoculated to the surround of juglans regia roots and juglans regia is stressed by drought for a certain time, juglans regia is substantially improved in bacterial community structure diversity in rhizosphere soil compared with juglans regia inoculated with common growth-promoting bacteria, the leaf relative water content and the water utilization efficiency are improved, and the drought resistance of the plant is enhanced. Therefore, the bacillus cereus provided by the invention or a bacterium preparation by taking bacillus cereus as a raw material can be used as an inoculation agent and applied to drought environment, and the bacillus cereus provided by the invention helps to provides an excellent bacterial strain resource for improving the drought resistance of juglans regia.