34 results about "Ion regulation" patented technology

In order to solve the problems of serious water consumption and poor molecular weight uniformity in the traditional process, the present invention discloses a method for directional production of low-viscosity and ultra-low-viscosity alginate by enzymatic method based on ion regulation. After the brown algae is soaked, solidified and digested , transferred to the membrane bioreactor and added via K + 、Na + and Ba 2+ The alginate lyase treated with the solution is used for enzymatic hydrolysis to reduce the viscosity, and after the end, the enzyme is inactivated and filtered to obtain clear glue. The clear glue solution is then subjected to processes such as calcium precipitation, decalcification, neutralization, alcohol precipitation, and drying to obtain low-viscosity and ultra-low-viscosity alginate. The alginate product prepared by the invention has good molecular weight uniformity, and the main component content is between 80-100%. The invention has the advantages of simple process, strong continuity, less water consumption, no need for harsh conditions such as high temperature and high pressure, and overcomes the problems of long enzymatic treatment time and the like in other processes. Compared with traditional process production, it can save 60-80% of water consumption, which greatly saves the consumption of water resources.

The invention discloses a rapid biofilm formation method for low C / N ratio waste water treatment using a calcium ion-regulated biofilm method, belonging to the field of biofilm-process waste water treatment. The method is characterized by comprising the following steps: (1) measuring biochemical oxygen demand 5 / total nitrogen (BOD5 / TN) of the low C / N ratio waste water; (2) measuring the polysaccharide concentration of dissolved substances in the low C / N ratio waste water and the salinity of the waste water; (3) measuring the contact angle of a filler carrier used by the biofilm method for treating the low C / N ratio waste water; (4) selecting a proper regulation and control scheme according to the related measured values; (5) enabling a biofilm reactor to run, and adding a certain amount of rhamnolipid and calcium chloride into the low C / N ratio waste water every day until biofilm formation is completed. According to the rapid biofilm formation method, calcium ions are complexed with pollutants in the low C / N ratio waste water, so that the attachment and colonization of the dissolved substances and microorganisms in the waste water are accelerated, and the biofilm formation effect is further improved.

The invention discloses an SIMS optimization detection method for trace impurity element concentration and distribution in AlN, and belongs to the technical field of material detection. The method comprises the steps of transferring graphene on the surface of a sample; placing the sample subjected to the graphene transfer in a sample chamber of a secondary ion mass spectrometer, and carrying out vacuumizing; introducing oxygen into the sample chamber; sputtering secondary ions from the sample; adjusting the pulse width of an extraction voltage and the number of analyzed frames in each cycle period; collecting the secondary ions; analyzing the secondary ions to obtain a mass spectrogram and a secondary ion depth profile chart; and obtaining a detection result of trace impurity elements in the sample. According to the technical scheme, high-precision detection can be carried out on the trace impurity element concentration and distribution in the AlN; various types of the trace impurity elements can be detected; the volume concentration detection limit reaches the ppb level; the test precision of the impurity elements can reach below 10%; and the resolution of impurity element distribution is less than 10 nm.

The invention belongs to the field of microbial fermentation and discloses an optimized lincomycin fermentation production method. The method comprises adjusting the ammonium ion concentration in the initial fermentation medium to 57±5mmol / L, cultivating Streptomyces lincomycin; When the concentration of ammonium ions is 0.2-1.5mmol / L, add ammonium ions, and then control the concentration of ammonium ions in the fermentation medium to 2-5mmol / L until the end of fermentation. For the first time, the present inventor has studied the influencing factors of Streptomyces lincomycin fermentative production of lincomycin on a larger scale, and summarized an optimized lincomycin fermentation production method, which can greatly increase the yield of lincomycin .

The invention discloses a DNA colorimetric logic gate construction method based on metal ion regulation and control of exonuclease III shearing action and belongs to the technical field of molecular computer. Double-stranded DNA containing T-T or C-C mismatched base cannot be sheared by exonuclease III. When there exists Hg<2+> or Ag<+>, 3' end completely matched double-stranded DNA formed by action of T-Hg<2+>-T or C-Ag<+>-C can be sheared by exonuclease III, and released single-stranded DNA hybridizes with a DNA signal probe 1 or DNA signal probe 2, thus leading to formation or disintegration of a G-quadruplex structure. Hereby, Hg<2+> and Ag<+> are used as input signals, and logic operation is carried out through the DNA signal probe so as to construct multiple DNA colorimetric logic gates.

The invention relates to a single electrode regulated ion triode with a diverging / convergent nano channel structure. The single electrode regulated ion triode comprises a substrate, an upper cover plate, regulating electrodes, driving electrodes, an insulating layer, and liquid storage pools; one driving electrode, the insulating layer, one liquid storage pool, the substrate, the other liquid storage pool, the insulating layer, and the other driving electrode are arranged from the front to the back successively; one regulating electrode, the insulating layer, the substrate, the insulating layer, and the other regulating electrode are arranged from the left to the right successively; the upper end surface of the substrate is provided with a diverging / convergent nano channel with a width of nanometer scale, and the single electrode regulated ion triode is penetrated by the diverging / convergent nano channel from the front to the back; and the upper cover plate used for covering the diverging / convergent nano channel is arranged on the substrate. The invention also relates to a characteristic adjusting method of the single electrode regulated ion triode with a diverging / convergent nano channel structure. The single electrode regulated ion triode is simpler in structure, is lower in cost, and is more convenient to prepare; real-time regulating of triode breakover current can be realized; and application prospect is promising. The invention belongs to the technical field of ion triode.