Abstract The phenol red is commonly used in cell culture medium as visual pH indicator by changing its color from darker to the orange-yellowish neutral acidic level. change of hardly be determined using naked eyes that will interpreted differently different person. Thus, this study executed develop a specialized colorimeter for measurement Raspberry Pi microcontroller unit, green LED light sou...

In the control system of a quantum gravimeter, optical signal containing phase information is weak and usually at nV level. This situation puts forward high requirements for measurement performance system. As coupling input component system, noise level preamplifier has dramatic influence on performance. this paper, current provided by photodiode. According to photodiode output characteristics,...

The dripping faucet experiment seeks to provide a relatively simple visualization of a system that exhibits seemingly predictable dynamics that quickly transitions to an entirely unpredictable, chaotic behavior under certain conditions. This behavior is first modeled through equations determine from previosu research and papers in order to understand the general phenomenon and established a bas...

Ultra-fast liquid chromatography with a photodiode array detector for simple and rapid determination of urea in body fluids of farm animals is described. Blood plasma, milk, and urine samples are treated with trichloroacetic acid and then centrifuged. Supernatants are derivatized at room temperature using p-dimethylaminobenzaldehyde. Samples are separated using a ternary gradient of methanol in...