Transgenic silkworms can spit spider silk fibers

Transgenic silkworms can spit spider silk fibers

According to the report of the American Physicist Organization Network on January 4 (Beijing time), spider silk has long been known for its excellent toughness and strength, but the spider's territorial awareness and similar habits of hunting have made this high-quality fiber. Difficult to mass produce. Recently, a new technology is expected to change this situation, so that spider silk is widely used in medical and other fields. The results of relevant studies were published in the latest issue of the Proceedings of the National Academy of Sciences.

In order to fabricate fiber with spider silk protein, scientists have come up with many ways to try it on genetically modified bacteria, yeast, plants, insects and even mammalian cells in the hope of finding a way to replace spider spider silk. However, it was found that the only transgenic silkworm technology that can adapt to the existing textile technology and can be quickly mass-produced is the most ideal.

It is based on this consideration that Professor Don Jarvis of the University of Wyoming, USA, and colleagues have developed a new type of transgenic silkworm that can spit out synthetic fibers containing spider silk proteins. The researchers said that on average, the synthetic fiber is much tougher than ordinary silk, and its strength and toughness are roughly the same as natural spider silk.

To do this, the researchers found a key gene that controls the properties of spider silk protein and added it to transgenic silkworms. The expression of this gene significantly increases the elasticity and tensile strength of silk and allows these silkworms to spit out. Synthetic fiber containing spider silk protein. Since silkworms can produce miles of fiber by means of smashing, this also significantly increases the yield of new fiber.

The study may open the door to the large-scale production of these fibers and their application in the medical and other fields. This fiber is expected to find applications in the manufacture of artificial ligaments, tendons, tissue scaffolds, wound dressings, sutures and other medical materials. In addition, due to their excellent strength, they will also be ideal materials for making body armor.

There have been many similar techniques before, but the yield is relatively low and the binding of chimeric proteins to silk fibers is not stable. In contrast, this group of researchers reported that their technology has improved this, allowing silkworms to become a factory for producing spider silk. (Reporter Wang Xiaolong)

High Speed Door Motor And Control Box

Our company have German SEW Motor, Japan Mitsubishi Controller. Our own brand Hofic servo motor and controller. Chinese famous brand SEJ motor and Holip controller.

About our German SEW Motor and Japan Mitsubishi Controller: It is easy to find the ideal energy-efficient motor for your application at SEW. The series has a suitable design in its range for the globally applicable efficiency classes. Select the power and frequency within this motor design and you have already taken care of the most important selection criteria.All other motor options are of course available independently of the efficiency class. A comprehensive braking concept and cost-optimised built-in encoders ultimately complement the motor range. Comprehensive braking concept and combinations i.e. up to three different brake sizes per motor size featured in the range: Cost-optimised built-in encoders integrated into the motor. Motors for efficiency classes IE1 to IE4.Compact design saves space and costs. Future-proof, also as regards environmental protection (standards). Reduction in operating costs when using energy-efficient motors; our energy-efficient motors conform to the efficiency classes.

About servo High Speed Door Servo Control System: Our rolling gate servo control system is suitable for high speed and high usage soft and hard rolling gate. The whole system is in a small and light package, it has high torque and high operating speed, lower noise, high reliability, smooth and soft operating curves, it`s suitable for high speed and usage environment. The rolling curtain can be controlled by pull switch, push button, Bluetooth, ground radar, ground magnetic sensors. Operating Speed: 1M/s; Operating Width: <16 ㎡; Daily operating time: >2000 time; Rated voltage: 220v; Rated Output: 0.75 KW/1.5KW.

The system can operated via: 1) control box; 2) inching electronic control; 3) continuous automatic operation; 4) emergency stop; 5) single side operation box; 6) time delay; 7) ground radar and/or magnetic sensors. Please refer to Wiring Terminal for eternal connections.

System has fuse/safety wire shutdown switch for three-phase power protection, fuse/safety wire for operating circuit protection, and temperature sensing relay for motor protection.

Stroke Controller utilizes absolute value encoder. Connect the absolute value encoder and reducer via encoder`s axle, and fix the wings on to the reducer, than insert the aviation plug into plug receptacle.

The mounting screw for the control box must inspect regularly to prevent screw been getting loose and falling off. Check the internal and external wirings. Check and change the oil for the redactor on regular basis.

Precision: The system use Full closed-loop servo control and Double Encoder design. This is to ensure long operating life and to prevent overshooting during operating.

Stability: The system utilizes integrated design concept, in order to simplify internal wiring and prevent any function caused by wiring and terminal connections.

High Speed: Motor max speed is 2500 rpm; door max operating speed is 2 m/s.

Smooth: The torque servo system can adjust torque to the load automatically, and its speed curve mode step less speed regulating to ensure a smooth operation.

About SEJ motor and Holip controller: Three-phase asynchronous motor with magnetic brake has broad uses, It is suitable for various mechanical main drive and auxiliary drive, and it is also used for various required rapid stopping and correct positioning. The braking time within 0.2 second. Electric motor is added the DZM series direct current electromagnetic arrester by the basic series(Y series) electric motor.The protection class of electric motor part is IP44,the arrester part is IP23.if be applicable to bad environment can also make the arrester part into IP44,but customer have to put forward a special request while ordering,the manufactory can design a manufacturing exclusively. Its structure diagram is picture 1 and 2,picture 1 is the structure with hand release.Picture 2 is the structure without the hand release.Its operating principle BE, after being to make the retardation coil(6)to connect direct current power supply,because of the function of electromagnetic force,electromagnet(7)attract gag bit(5),and compress spring(24),make arrester disc(2)away from the friction surface of the gag bit(5)and shield(26)(the electrical motor can immediately operate normally).When the power supply cuts off after,the electromagnet(7)loses electromagnet force,the spring(24)releases the gag bit(5)and compress tightly to arrester disc(2),the arrester function,stop(the motor shaft)quickly,make electric motor shop turning to move,for the second time connect power supply will repeat above-mentioned action.

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Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfrollershutterdoor.com