English
In biological experiments, the processing and preservation of some liquids are often involved. Carboys are ideal for storing sterile liquids, distributing solutions and culture media. The commonly used specifications are mainly 10L and 20L. The material of this container are two main types: PP (polypropylene) and PC (polycarbonate).
Polypropylene: It is a polymer formed by the addition polymerization reaction of propylene. The operating temperature range is -30~140℃. It can resist the corrosion of acids, alkalis, salt liquids and various organic solvents below 80℃, and can decompose under high temperature and oxidation. Polypropylene is a thermoplastic synthetic resin with excellent properties. It is a colorless, translucent thermoplastic lightweight general-purpose plastic with chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high-wear resistance processing properties.
Polycarbonate: The liquid storage tank made of this material has higher transparency. The material has high strength and elastic coefficient, high impact strength, good fatigue resistance, good dimensional stability, and small creep (very few changes under high temperature conditions). ), high transparency and free dyeability; wide operating temperature range, the enhanced UL temperature index reaches 120~140℃.
The above are two commonly used materials and characteristics of carboys. Both materials can be sterilized by high temperature and high pressure. The difference is that PC has better transparency, while PP material is more durable and reusable than PC material, saving experiments cost.
The FAI climbed 5.9 percent year-on-year in the first 11 months of 2018, quickening from the 5.7-percent growth in Jan-Oct, the National Bureau of Statistics (NBS) said Friday in an online statement.
The key indicator of investment, dubbed a major growth driver, hit the bottom in August and has since started to rebound steadily.
In the face of emerging economic challenges home and abroad, China has stepped up efforts to stabilize investment, in particular rolling out measures to motivate private investors and channel funds into infrastructure.
Friday's data showed private investment, accounting for more than 60 percent of the total FAI, expanded by a brisk 8.7 percent.
NBS spokesperson Mao Shengyong said funds into weak economic links registered rapid increases as investment in environmental protection and agriculture jumped 42 percent and 12.5 percent respectively, much faster than the average.
In breakdown, investment in high-tech and equipment manufacturing remained vigorous with 16.1-percent and 11.6-percent increases respectively in the first 11 months. Infrastructure investment gained 3.7 percent, staying flat. Investment in property development rose 9.7 percent, also unchanged.