Passage operation of cells in cell factory systems

Mon Jul 24 15:16:26 CST 2023

Cell passage is a common operation in cell culture, which refers to the transfer of cells from one culture vessel to a new culture vessel to promote continued proliferation and growth of cells. The following are the general steps of the cell passaging operation in the cell factory systems:

1. Prepare the cell culture: Remove the cell culture and check the status and density of the cells. Ensure cell cultures are growing optimally and assess cell numbers and health.

2. Pretreatment of the culture container: select the cell factory systems with appropriate specifications, and add an appropriate amount of culture medium or culture solution according to the number of cells and the expected growth time.

Cell Factory SystemsCell Factory Systems

3. Rinse the cells: Rinse the cells in the cell culture with the culture medium to remove the residue and waste liquid in the cell culture. Rinse is usually performed with a sterile buffer such as PBS (phosphate buffered saline) or sterile cell culture medium.

4. Cell dissociation: add appropriate cell dissociation enzyme, enzyme amine or mild buffer to dissociate cells so that they can be dispersed into single cells. Times and conditions should be optimized for specific cell types and dissociation reagents.

5. Count cells: Use a cell counter or reciprocator to count the dissociated cells to determine the concentration and number of cells. Calculate and adjust the passage ratio of the cells as needed.

10 Layers Cell Factory Systems10 Layers Cell Factory Systems

6. Inoculate a new culture container: Add an appropriate amount of cells into the pretreated new cell factory systems to continue culturing.

The above are the operation steps of cell subculture in the cell factory systems. We must strictly follow the aseptic principle during operation, because the cells are easily contaminated due to improper operation. Of course, you can also use the dedicated piping system of the cell factory systems to reduce the risk of cell contamination.

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.