In this article we will discuss about the principle and instruments of colorimetry. Principle of Colorimetry: Colorimetry is a widely used technique applied in biological system. It involves the measurement of a compound or a group of compounds present in a complex mixture. The property of colorimetric analyses is to determine the intensity or concentration of compounds in coloured solution. [...]
The following points highlight the six full proof techniques of chromatography. The techniques are: 1. Partition Chromatography 2. Ion Exchange Chromatography 3. Adsorption Chromatography 4. Gel Permeation Chromatography 5. Gas Chromatography Principle 6. High Performance Liquid Chromatography (HPLC). Technique # 1. Partition Chromatography: Two immiscible liquid phases are passed through the supporting phase-containing materials. This is also called Liquid-Liquid Chromatography. [...]
In this article we will discuss about the anatomical structure of some dicotyledonous stems that show secondary growth. 1. Anatomy of Bignonia Stem (Fig. 7.4): The following tissue layers are seen in the T.S. of the stem: 1. Epidermis: It is uniseriate and cuticularised. It is wavy in outline. 2. Cortex: It is parenchymatous and bounded internally by a starch [...]