Regarding long-term cryopreservation of cells, there are two optional containers, liquid nitrogen tanks and gas-phase liquid nitrogen tanks.
The former is to freeze cells in liquid nitrogen; the latter is to freeze cells in a low-temperature environment generated by liquid nitrogen;
Both of them also rely on liquid nitrogen for cooling, but some people say that using gas-phase liquid nitrogen tanks is safer. Why is this?
In fact, no product can be guaranteed to be perfect. It cannot be said that using gas-phase liquid nitrogen tanks to freeze cells is safer. It can only be said that the safety index is higher than that of conventional liquid nitrogen tanks.
Mainly manifested in three aspects:
1. Storage mode security
The gas-phase storage mode is used to freeze cells, which uses low-temperature nitrogen volatilized by liquid nitrogen for cryopreservation. There is no contact between cells and liquid nitrogen, which can avoid cross-infection of cells during storage and avoid accidental entry of liquid nitrogen into the cryopreservation tube. pipe burst problem;
2. Temperature safety
The temperature inside the gas-phase liquid nitrogen tank is divided into zones. The temperature difference between the upper and lower parts is about 10�°C, which can be said to be very stable. The temperature at the mouth of the tank can be maintained at -190�°C. The lower the temperature, the lower the temperature. No matter where the cells are stored, , the activity will not be "excited" due to large fluctuations in temperature, thereby losing activity.
3. â??Equipmentâ?? security
The gas phase liquid nitrogen tank has a complete intelligent monitoring system.
It can detect temperature, 3 temperature sensors, transmit internal temperature in real time;
It can monitor the liquid level, determine the liquid level height, and can pre-set high/low liquid level alarms;
In addition to these functions, there are also heat exhaust functions, lid opening and defogging functions, alarm and remote alarm functions, event recording, and communication functions. These functions all serve the safety of cells.
This is why the safety index of gas-phase liquid nitrogen tanks is higher than that of conventional liquid nitrogen tanks.
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This is chemical setting Furan based chemical resistant mortar which is combination of Liquid and Powder, when mixed in proper proportion from workable mortar which after setting and curing give of liquid and give black highly cross linked composites. Furan When set and cured is resistant to highly corrosive acids, alkalis and to powerful organic solvents such as ketones, Aromatic and Chlorinated solvents. It has extreme resistant to Acidic & alkalis, Salts, Greases and Detergents. It resists to Organic & Inorganic acids at their boiling temperature. It is suitable against mild chlorine Gas (dry) phosphorous trichloride, pyridine at room temperature. Furan is especially useful where resistance to mixed media such as aqueous acids /alkalis and organic solvents is needed in chemical plant process and waste streams. Carbon filled Furan is used against corrosive effect of hydrofluoric acid & its salts. PREPARATION OF FURANE MORTAR : Mortar consist of Furan solution and Furan powder. The average mixing ratio necessary to obtain mortar with good working consistency is 1 part by weight Solution & 3 part by weight powder. The ratio will vary slightly depending on temperature and working conditions.Stir the liquid thoroughly before using. Place liquid in a suitable shallow mixing pan. Add powder by weight in the solution mix thoroughly and rapidly until all lumps are dispersed and the mortar is completely homogenous. Spread out the mortar in a thin layer, not more than ¾ thick, to dissipate the heat of reaction and lengthen the working life. Batch size can be varied depending upon the temperature and the speed with which the masons are working. Very large batches will become stiff quite rapidly. Make sure that all the Furan Motrar is used from the pan before another batch is mixed.When working at temperature above 40 C, very small batches not more than 2 Kgs, should be prepared. When working at temperature below 15C the liquid should be kept warm.
The pottery stone ore shown in the earlier photograph is a particularly high-quality special-grade material among our pottery stones. Pottery stones are generally finely crushed, and used as the material for ceramics, bone china, and sanitary ware (toilets, sinks, etc.). Products are shipped out from our mine in sizes of
Cement clinker is a solid material produced in the manufacture of Portland cement as an intermediary product. Clinker occurs as lumps or nodules, usually 3 millimetres to 25 millimetres in diameter.
Like wax candles, Rouseki (Pyrophyllite) is white and semi-transparent, and has a waxy texture when touched. It is very brittle, and tends to crack largely along the stone joints. Up close, this stone looks grayish white, but may look blue from a distance. The ore looks so similar to pottery stone ore that they cannot be distinguished. But there is a difference in their texture, color, and how they crack, and with experience, their differences become more visible. They not only look and feel different, but their applications and properties also differ significantly. It's used as Firebricks, crucibles, glazes, fire-resistant powders, etc.
