Glucose concentration may be determined enzymatically by a glucose-oxidase procedure in which the amount of oxygen depletion from a solution saturated with oxygen is observed. The difference between the initial and final oxygen levels as detected by a polarographic oxygen analyzer is a measure of glucose concentration. Blood is sampled continuously by means of a double-lumen catheter inserted i...

Maintaining Dissolved Oxygen (DO) levels in the hydroponic plant nutrient solutions can be done using nanobubble technology. Manual monitoring time-consuming and measurement results are less accurate. Therefore, a system is needed to monitor air temperature, humidity, water pH, concentrations, DO levels. Several stages this research preparation, design, sensor calibration, implementation. Air t...