Serum refers to the pale yellow transparent liquid separated from plasma after fibrinogen and some coagulation factors are removed from plasma after blood coagulation, or plasma from which fibrinogen has been removed. Media bottles for storing serum are generally made of polyester (PET) material. What are the characteristics of this material?
The storage temperature of serum is generally -5 °C to -20 °C, and its main functions are to provide basic nutrients, hormones and various growth factors, binding proteins, contact-promoting and growth factors to protect cells from mechanical damage, Cells in culture provide some protection. The media bottle made of PET has the following characteristics:
1. High transparency and good gloss;
2. Good mechanical properties, the impact strength is 3-5 times that of other films, and the folding resistance is good;
3. Oil resistance, fat resistance, dilute acid, dilute alkali, and most solvents;
4. Good heat aging resistance, the embrittlement temperature is -70 °C, and it still has a certain toughness at -30 °C; PET is not easy to burn, the flame is yellow, and the burning oil drips;
5, non-toxic, tasteless, good hygiene and safety, can be directly used for food packaging;
6. The gas and water vapor permeability is low, and it has excellent gas barrier, water, oil and odor properties.
The excellent characteristics of PET material fully meet the storage requirements of serum. This media bottle can also be used for long-term storage of aqueous solutions, such as culture medium, trypsin, reagents, etc.
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.