Factor and method for regulating vernalization trait of Chinese cabbage

The invention relates to a factor and a method for regulating vernalization trait of Chinese cabbage. The invention discloses application of Chinese cabbage blooming regulation factor 2 (BRF2) genes, positive transcripts or expression products thereof in regulation of vernalization traits of crucifers. The invention also discloses a method for regulating the vernalization traits of the crucifers, which comprises that the BRF2 genes or the BRF2 positive transcripts are transferred into the crucifers in an over expression mode. The invention also discloses a method for preparing a vernalization delayed transgenic plant. The invention discloses a molecular mechanism of vernalization trait specificity and evolution of the crucifers. In practice, according to the structure of the regulation factors and the molecular target of functional designed vernalization trait regulation, the regulation factors can be modified and guided into the crucifers to culture novel agronomic trait varieties.

Vc two-step fermentation microecological regulation and control technique

The present invention relates to a preparation method of Vc, in particular it is a fermentation process in the production of Vc, and is mainly characterized by that on the basis of original method said fermentation process adopts inoculation of liquid inoculum, number of inoculum is 10 to the power 8-10 to the power 9/ml, two strain ratio (small : big) is 20-30, fermenting for 16-24 hr., regulating pH value to 7.0-8.0, continuing for 5-60 min., returning to original process, fermenting 24-36 hr. and regulating pH 6.8-7.1 until the fermentation is completed. Said invention is simple in operation, has no need of increasing new equipment, and is easy to extensively use.

Portable manufacturing device for oil catch teeth

The invention provides a portable manufacturing device for oil catch teeth. The portable manufacturing device comprises a strip-shaped base which is rotationally connected with a driving wheel and a driven wheel, wherein the driving wheel and the driven wheel are close to each other and tangential to each other, the outer circumferential surface of the driving wheel and the outer circumferential surface of the driven wheel are respectively provided with a circle of groove, the driving wheel is connected with an L-shaped locking frame, one edge of the locking frame is connected to the edge of the upper surface of the driving wheel, the other edge of the locking frame extends downwards to the outer side of the groove in the outer circumferential surface of the driving wheel, and the upper surface of the driving wheel is provided with a rotary handle. The portable manufacturing device has the advantages that the structure is simple, machining and manufacturing are convenient, and manufacturing ...

Steam turbine stationary part centering device

The invention discloses a steam turbine stationary part centering device which comprises an earphone, a dry battery, a steel wire and an inner diameter micrometer. The inner diameter micrometer comprises an insulated measuring rod and a metal adjusting portion on the end portion, the steel wire is tensioned and fixed on a longitudinal central line of a steam turbine cylinder, one power supply line of the earphone is electrically connected with a cathode of the dry battery through a lead while the other power supply line of the same is electrically connected with the metal adjusting portion of the inner diameter micrometer through the lead, and an anode of the dry battery is connected with the steel wire electrically through the lead. The steam turbine stationary part centering device has the advantages that the device is simple in structure, convenient to operate, accurate in measured data, small in error and convenient in stationary part adjusting, working efficiency is improved greatly ...

Tester used for measuring stress of flexible objects in low-speed wind tunnel and testing method thereof

The invention discloses a tester used for measuring the stress of flexible objects in a low-speed wind tunnel and a testing method of the tester. The tester comprises a supporting frame, two strain balances and two supporting rods, wherein the balances and the supporting rods are connected into a whole through flanges and arranged on the supporting frame in space in a crossed mode, and kinematics characteristics of the flexible objects are shot through a high-speed camera in combination with laser sheet laser sources. Meanwhile, a data collecting system is used for collecting balance signals for analyzing the stress characteristic of the flexible objects, so that the vibration amplitude, the vibration frequency, the vibration mode, the stress and other information of the flexible objects are obtained. The stress of a single flexible object or the multiple flexible objects under interaction can be dynamically measured, in the process of measuring the stress, a high-speed shooting system ...

Coupling alignment device

The invention provides a coupling alignment device. The coupling alignment device comprises a fastening threaded rod penetrating through a center hole of a coupling. The fastening threaded rod is sleeved with a main pressing plate and an auxiliary pressing plate, wherein the main pressing plate and the auxiliary pressing plate are tightly attached to the end faces of the two sides of the coupling. A fastening nut is connected to the portion, outside the main pressing plate, of the fastening threaded rod, the portion, outside the auxiliary pressing plate, of the fastening threaded rod is sleeved with a fastening sleeve, a radial locking screw is arranged on the fastening sleeve, an L-shaped gauge frame is connected to the main pressing plate, and a dial gauge is arranged at the tail end of the top of the gauge frame. The coupling alignment device has the advantages that the structure is simple, machining and manufacturing are convenient, cost is low, unit centering and alignment operation ...

Plant leaf rolling controlling gene and application thereof

The invention discloses a plant leaf rolling controlling gene and application thereof and also discloses a method for preparing leaf-flattening or rolling transgenic plants. The gene can be used for preparing the leaf-flattening or rolling plants in production practice and is used for cultivating new plant varieties, and the like.

Speed reducer testing device

The invention relates to the technical field of speed reducer production testing, in particular to a speed reducer testing device which comprises a platform, a speed reducer, a load end, an input end, a first track mechanism, a second track mechanism, a third track mechanism, a fourth track mechanism, a first lifting mechanism and a second lifting mechanism. The load end, the speed reducer and the input end are sequentially arranged in the length direction of the platform. The third rail mechanism and the fourth rail mechanism are parallel to the length direction of the platform, the first lifting mechanism is installed on the third rail mechanism, and the third rail mechanism drives the first lifting mechanism to move in the length direction of the platform. According to the testing device, the coaxial speed reducer, the parallel-axis speed reducer and the staggered-axis speed reducer can be tested, the practicability is high, three testing platforms do not need to be designed, and the ...

Brake crank assembling jig

The invention discloses a brake crank assembling jig. Comprising a base, a transverse handle main positioning block which is fixed on the base and is used for fixedly positioning the middle part of a transverse handle, and a transverse handle auxiliary positioning block which can move up and down along the vertical direction and is arranged on the base, the auxiliary positioning height adjusting mechanism and the brake handle height adjusting mechanism are used for adjusting the heights of the transverse handle auxiliary positioning blocks and the brake handle supporting blocks, and the two transverse handle auxiliary positioning blocks are located on the two sides of the transverse handle main positioning block in the extending direction of the transverse handle respectively. Handle portions, used for installing brake handles, of the two ends of the transverse handle can be located on the transverse handle auxiliary locating blocks respectively, the two brake handle supporting blocks and ...

Two-step fermentation method for preparing VC precursor

Roller enveloping speed reducer with adjustable back clearance

The invention relates to the technical field of speed reducers, in particular to a roller enveloping speed reducer with an adjustable back clearance, which comprises a shell, a worm gear, a worm, an eccentric shaft sleeve and a bearing, a cavity is formed in the shell, and the cavity is divided into a first cavity body and a second cavity body; the worm gear and the worm are sequentially and rotationally installed in the first cavity and the second cavity, the worm is meshed with the worm gear, and the worm gear is located above the worm; at least one eccentric mechanism is installed on the worm, and the distance between the worm and the worm gear is adjusted through the eccentric mechanism. The invention also provides a preparation method. On the premise that the speed reducer is not disassembled, the adjustable back clearance is achieved, the technical problem that the back clearance is increased due to material abrasion is solved, the meshing precision between the worm gear and the worm ...