Ultraviolet light (UV light) is a type of electromagnetic radiation that is located between visible light and X-rays in the electromagnetic spectrum. It is invisible to the human eye, and has a frequency greater than that of visible light but lesser than X-rays. It has a wavelength ranging from about 10 nm to 400 nm (ISO, 2007). UV light is a part of the radiation that comes from the sun. It can also be produced artificially by electric arcs, black lights, tanning lamps and mercury vapor lamps. The name Ultraviolet literally translates to “beyond violet”, as it has a ...
Essays on Fluorescence
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Introduction
Quinine is a basic organic amine which is found in the bark of cinchona tree. It has a long history of relationship with humanity. The extracts from the bark containing quinine were used to treat malaria from the 17th century but as a pure chemical substance, it was isolated from the bark only in 1820 (Achan et al. 144). Its chemical formula is C20H24N2O2, according to IUPAC its systematic name is (R)-(6-Methoxyquinolin-4-yl)((2S,4S,8R)-8-vinylquinuclidin-2-yl)methanol. Its structure is shown in Fig. 1. Quinine is used for a variety of purposes. It is still used for ...
Introduction
There are environmental chemical processes which require light to react. These processes are called photochemical reactions. Photochemical reaction is commonly initiated due to the absorption of solar energy or light. When molecules absorb energy in the form of light, the atoms are converted in a transient excited state (Larson & Weber, 1994). This transition state or excited has completely different physical and chemical properties with the initial state of the molecule. The excited states also have more tendencies to react since they are considered stronger acids and stronger reductants that the initial state of the molecule. The excited state of ...
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The neural network controls physical activities. Recently scientists have found out that the neural network can be observed to show different levels of activation depending on an organism’s mental activity. Scientists have gone further to devise actual methods that detect brain activity in particular instances. The brain and the neural network never stop working; however, certain tasks cause the brain and the neural network to work faster, harder and more intensely (Garcia). These unique activities usually register or appear as spikes or dips in the never-ending sequence of brain activity. Genetically Encoded Voltage Indicators (GEVIs) are a promising ...
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