Release date: 2016-10-17
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Professor Yu Shuhong from the University of Science and Technology of China for the first time prepared artificial bionic structural materials by simulating the growth process of natural mother-of-pearl. It has high chemical composition and microstructure similar to natural mother-of-pearl, and has good strength and toughness. The results were published in the American journal Science published recently.
The inner layer of the mother-of-pearl has a unique and complex micro-layered structure, which makes the mother-of-pearl have extraordinary hardness and toughness at the same time, which are not compatible with many synthetic materials.
The Yu Shuhong team first constructed a similar layered “frame†with the same organic material as the natural shell by means of orientation freezing and acetylation transformation, and placed it into the artificial “cavityâ€. Unlike the shellfish in nature, which spent several years continuously secreting the organic matter and mineralizing the calcium carbonate on its frame, Yu Shuhong designed a “circulatory systemâ€, which is a continuous pump that acts like a human heart. The saturated hydrogen bicarbonate solution is pumped into the frame of the chamber, and the residual waste after the reaction is taken out, and the natural formation process of the mother-of-pearl for several years can be “replicated†within two weeks, and the speed is over 100 times. Various detection methods such as electron microscopy show that the artificial material prepared by the material growth method which is highly similar to the natural strategy is highly similar to the natural mother-of-pearl in composition and microstructure, and reproduces the natural mother-of-pearl on multiple scales. The microscopic hierarchical structure and mechanical properties, while also showing good strength and toughness in the macroscopic.
Professor Yu Shuhong said that the development of human bones and teeth is similar to the formation of mother-of-pearl. The difference is that the main component of mineralization is calcium hydroxyphosphate instead of calcium carbonate. Using a similar strategy to synthesize artificial bones or teeth, it is expected to highly reproduce the strength and toughness of human bones, and because of the high degree of composition, it can effectively avoid the rejection of materials implanted into the human body, and also eliminate the former metal components into the human body. The pain to take out.
Source: Science and Technology Daily - China Science and Technology Network
Virus Specimen Collection Tube
Inspection principle:
It can perform protein denaturation on fresh clinical virus samples to inactivate the virus, prevent secondary transmission of infection, and ensure the safety of transportation and testing personnel.
♣.Structural composition: Combination of cotton swab and transport medium (VTM).
♣. Product requirements:
The product should be airtight, avoid high temperature, avoid direct sunlight storage. It should be used in a clean, hygienic, pollution-free, and temperature-friendly environment.
♣, Storage conditions and validity period:
â‘ , the product should be stored in a clean, dry and ventilated environment,
②, the temperature is 5℃-35℃;
â‘¢, relative humidity <85%RH;
â‘£, product shelf life: 12 months.
♣. How to use
â‘ Before sampling, mark relevant information on the label of the sampling tube.
â‘¡. Sampling with the corresponding cotton swabs.
â‘¢ After the collection is completed, quickly put the cotton swab into the collection tube, break the part higher than the sampling tube, and tighten the tube cover.
â‘£. For the specific sampling method, please refer to the following:
a) Nasal swab Gently insert the sampling head into the nasal cavity, stop for a while and then slowly rotate to exit, immerse the collected specimen in the Xiangxiang solution, break the excess part and discard it, and tighten the sampling tube cover.
b) Pharyngeal swab: Wipe bilateral pharyngeal tonsils and posterior pharyngeal wall with the sampling head, immerse the collected specimen in the sampling solution, break off the excess part and discard it, and tighten the cap of the sampling tube.
c), Mycoplasma Chlamydia, Ureaplasma specimen collection
Male: Insert the sampling head into the urethra about 2cm and rotate, stay for a while and then exit, and immerse the collected specimen in the sampling solution.
Female: Wipe the mucus of the cervical orifice, insert the sampling tip into the cervical canal for 1-2 cm for sampling, immerse the collected specimen in the sampling solution, break off the excess part and discard it, and tighten the cap of the sampling tube.
♣. Precautions
1. After the virus is collected, the disposable sampling swab should be completely inserted into the preservation solution, so that the virus can be retained to the greatest extent possible.
â‘¡ The collected specimens must be sent for inspection in time.
â‘¢. It is forbidden to use products with damaged packaging and expired validity period to prevent pollution.
This single-use Virus Sampling Tube is used for in vitro diagnosis. It cannot be used for human or animal oral or external use. If swallowed, it may cause serious events; it is irritating to eyes and skin. If it is not splashed into the eyes, rinse with water.
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