10 results about "Secondary growth" patented technology

The application discloses a preparation method of a PPSU-based ZIF-8 double-layer membrane and application of the double-layer membrane in hydrogen separation, and belongs to the technical field of gas separation membranes. The preparation method is as follows: ZIF-8 seeds are embedded in a PPSU matrix solution, then are spin-coated onto the surface of an alpha-Al2O3 carrier to obtain a PPSU-based membrane, and secondary growth of the membrane is carried out through a solvothermal reaction, so that the seeds grow epitaxially, a continuous, dense and defect-free ZIF-8 separation layer is formed on the surface and the near-surface region of the carrier substrate, and the reaction is ended to obtain the double-layer membrane. Through the seed embedding strategy, the interface bonding force between the ZIF-8 layer and the PPSU substrate is significantly enhanced, and the generation of interface defects is effectively inhibited. The double-layer membrane has high permeation flux and high separation selectivity for a H2 / CO2 system, and is particularly suitable for hydrogen separation and purification processes.

This utility model discloses a device for treating algae in a secondary sedimentation tank, including a track. A mounting frame is slidably mounted on the track, and a traveling mechanism is mounted on the mounting frame to drive it along the track. A connecting frame is mounted above the mounting frame, and a positioning frame is mounted on the side of the connecting frame. A cleaning component is mounted on the positioning frame, and a protective frame is located on the side of the positioning frame near the cleaning component. The protective frame is open on the side facing the track, and a collection box communicating with its inner cavity is mounted at the bottom of the protective frame. This device for treating algae in a secondary sedimentation tank uses high-pressure water flow to clean algae, achieving high cleaning efficiency and quality. It can be used for cleaning as needed, and the cleaned algae can be collected during the cleaning process to reduce algae falling and clogging the filter membrane. After high-pressure water flow cleaning, a chemical can be sprayed on the tank wall for secondary cleaning and prevention, reducing the survival rate of algae and preventing secondary growth.

The invention discloses a method for synthesizing a hierarchical pore MFI molecular sieve membrane based on a sacrificial crystal seed layer, and belongs to the field of zeolite molecular sieve membrane synthesis. The hierarchical pore MFI molecular sieve membrane with a compact selective top layer and a macroporous transition layer with high porosity is successfully constructed on a porous carrier through a surface wet gel secondary growth technology of a sacrificial crystal seed layer. The film layer structure and the gas separation performance are optimized by regulating and controlling the composition, the aging time and the crystallization time of the synthetic gel. The prepared hierarchical pore MFI molecular sieve membrane shows high permeability and excellent selectivity in n-butane / iso-butane separation, and the preparation process is good in repeatability, high in stability and suitable for industrial gas separation application.

The application discloses a method for synthesizing a hierarchical-pore MFI molecular sieve membrane based on a sacrifice seed layer and belongs to the field of zeolite molecular sieve membrane synthesis. The application successfully constructs a hierarchical-pore MFI molecular sieve membrane with a dense selective top layer and a macroporous transition layer with high porosity on a porous carrier through a surface wet gel secondary growth technology of a sacrifice seed layer. The membrane layer structure and gas separation performance are optimized by adjusting and controlling a synthesis gel composition, an aging time and a crystallization time. The hierarchical-pore MFI molecular sieve membrane has high permeability and excellent selectivity in n-butane / isobutane separation, has good preparation process repeatability and high stability, and is suitable for industrial gas separation application.

The application discloses application of a QmWOX4 gene in improving radial growth of Arabidopsis thaliana and belongs to the field of plant genetic engineering.The application discloses application of the QmWOX4 gene or a protein coded by the QmWOX4 gene in improving radial growth of Arabidopsis thaliana, wherein the sequence of the QmWOX4 gene is shown as SEQ ID NO:1, and the sequence of the protein coded by the QmWOX4 gene is shown as SEQ ID NO:2.It is found by the application that the QmWOX4 gene of Quercus mongolica controls radial growth of Arabidopsis thaliana, and the transgenic Arabidopsis thaliana containing the QmWOX4 gene obtained by the application has significantly improved radial growth, which is helpful to improve secondary growth of Arabidopsis thaliana, provides a reference for radial thickening and resistance enhancement of Arabidopsis thaliana, and has important scientific significance.

The application discloses a PagMED20 gene and application thereof in promoting growth of poplar, and belongs to the technical field of cross between genetic engineering and genetic improvement of forest trees. The application verifies the function of the gene by cloning and analyzing the PagMED20 gene and overexpressing the PagMED20 gene in 84K poplar by means of agrobacterium-mediated genetic transformation technology. Compared with wild type, the plant overexpressing the PagMED20 gene can significantly promote the plant height, base diameter, net photosynthetic rate, root chlorophyll content and / or root nitrogen content of the poplar, and the important role of the PagMED20 gene in promoting the plant height and secondary growth of the poplar is proved. The application has important practical and theoretical guiding significance for studying the growth stability of trees and cultivating new varieties of forest trees.

The application provides a preparation method of high-purity aluminum sol with large particle size, and belongs to the field of inorganic nanometer materials. The aluminum sol seed is prepared from organic aluminum alcohol, high-purity water, an alcohol solvent and a catalyst, and is subjected to heating reflux; dropwise adding liquid prepared from organic aluminum alcohol and the alcohol solvent, and dropwise adding liquid prepared from high-purity water and the catalyst are added, so that the crude aluminum sol is obtained; the crude aluminum sol is heated, and dropwise adding liquid prepared from a chelating agent and the alcohol solvent is added, and then evaporation and solvent replacement are carried out, so that the high-purity aluminum sol with large particle size is obtained. The application realizes controllable preparation of the aluminum sol with large particle size, uniform particle size and low metal impurity content through preparation of the seed and secondary growth of the seed, and improves the average particle size and size uniformity of the sol particles.

Synthesis of crystalline CHA Zeolite powder and highly oriented defect-free CHA Zeolite membrane is described herein by the secondary growth of small pore silicoaluminophosphate powder having chabazite (CHA) type framework crystals from economic raw material Zeolite films are formed through the gradual growth and integration of individual zeolite seed crystals within a designated seed layer and through the secondary growth method by synthesizing the membrane of the zeolites using a hydrothermal process. Thereby generating defect-free membranes with improved permeance by utilizing the smaller seed crystals typically ranging from 2 to 5 μm. Ultrasound has been used to accelerate the crystallization process by enhancing mass transfer, promoting uniform nucleation, and facilitating the dispersion of precursor materials as well as to improve productivity in terms of enhanced adherence of seed crystals to support surfaces, leading to crystal quality and morphology that leads to faster synthesis times, as evidenced by the rapid generation of seed crystals.

The invention discloses a PagMED20 gene and application of the PagMED20 gene in promotion of poplar growth, and belongs to the technical field of genetic engineering and forest genetic improvement crossing. According to the invention, the PagMED20 gene is cloned and analyzed, and the PagMED20 gene is over-expressed in the 84K poplar in combination with an agrobacterium tumefaciens-mediated genetic transformation technology, so that the function of the gene is verified. Compared with a wild type, an overexpressed PagMED20 gene plant can remarkably promote the plant height, the trunk diameter, the net photosynthetic rate, the root chlorophyll content and / or the root nitrogen content of the poplar, and it is proved that the PagMED20 gene plays an important role in promoting the plant height and secondary growth of the poplar. The method has important practical and theoretical guiding significance for researching the growth stability of trees and cultivating new forest species.

The present application relates to the field of plant biotechnology, and particularly relates to application of Eucalyptus grandis EgrDof5 gene in poplar, the application comprises at least one of the following: a, improving the biomass of poplar; b, improving the photosynthetic performance of poplar; c, regulating the secondary growth of poplar; the nucleotide sequence of the Eucalyptus grandis EgrDof5 gene is shown as SEQ ID No. 1. The present application can improve the biomass of poplar, improve the photosynthetic performance of poplar and regulate the secondary growth of poplar by transferring the Eucalyptus grandis EgrDof5 gene into the genome of poplar, which provides a new method for genetic improvement of poplar, helps to enrich the gene library of poplar and provides more choices for future forest breeding.