English
Cell culture is a special task that consumes energy. It requires not only suitable temperature, osmotic pressure, gas, pH value, culture medium and other conditions, but also regular observation of cell growth. So, for consumables with a multi-layer structure like the cell factory, how do you observe the growth status of the cells?
When the cell factory is cultured, the cell growth status can be observed with an inverted microscope or a cell microscopic observation monitor. The difference is that an inverted microscope can only observe the cell growth on the bottom 1-2 layers, while the cell microscopic observation detector can You can observe the growth of more cells with the help of high-precision cold-light LED lights.
Cells in a good growth state can be seen under observation under a normal microscope. The transparency of the cells is large and the outline is not clear. Only by observing with a phase-contrast microscope can the fine structure of the cells be seen clearly. There are few particles in the cells, no vacuoles, clear cell membranes, clear and transparent culture medium, no suspended cells and debris can be seen; when the cell function is poor, the outline is enhanced, and vacuoles, lipid droplets and other particulate matter often appear in the cytoplasm. As the gap between them increases, the cell morphology may become irregular, or even lose its original characteristics.
Observing the growth status of cells is a necessary step for cell factory culture. Only cells in good growth status can be used in experiments. Generally, after cell inoculation or passage, observe the cell morphology, growth, pH of the culture medium and contamination or not every day or at least 1-2 days, and keep abreast of the dynamic changes of the cells for medium replacement or passage treatment. If abnormal conditions are found, take immediate measures.
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.