A brain natriuretic peptide (BNP) test measures the amount of the BNP hormone in your blood. BNP is made by your heart and shows how well your heart is working.Normally, only a low amount of BNP is found in your blood.uide. A brain natriuretic peptide (BNP) test measures the amount of the BNP hormone in your blood. BNP is made by your heart and shows how well your heart is working. Normally, only a low amount of BNP is found in your blood.
Bacterial cultures can be preserved for long by suspending in glycerol broth and storing at -20 to -70 degree Celsius. The protocol as below: To 0.85 ml of bacterial culture, add 0.15 ml of sterile glycerol (sterilized by autoclave, final glycerol concentration : 15%, v/v).
I. TYPES OF CELLS GROWN IN CULTURE. Tissue culture is often a generic term that refers to both organ culture and cell culture and the terms are often used interchangeably.Cell cultures are derived from either primary tissue explants or cell suspensions.II. PRESERVATION AND STORAGE. Liquid N2 is used to preserve tissue culture cells, either in the liquid phase (-196Â°C) or in the vapor phase (-156Â°C). Freezing can be lethal to cells due to the effects of damage by ice crystals, alterations in the concentration of electrolytes, dehydration, and changes in pH.