BiocheminsiderIntroduction Nutrient agar is a general purpose medium for the cultivation of organisms that are not demanding in their nutritional requirements e.g. organisms that can be isolated from air, water, dust etc.It is the most popular media that are generally available in all laboratories for enumeration of different bacteria and their maintenance.Nutrient is made up of: Principle … Read more
By Prof Jeremiah Seni Introduction Blood agar is actually a couple of related media, all of which are rich formulations containing peptones, yeast extracts, liver or heart extracts (depending on the medium), and blood. The blood is usually sheep’s red blood cells (RBC), though horse and other species may be used. Blood agar is used … Read more
There are two types of overlapping orbitals, that is, sigma (σ) and Pi (π). Both bonds are formed from the overlap of two orbitals, one on each atom. Sigma bonds occur when orbitals overlap in an end-to-end fashion, with the electron density concentrated between the nuclei of the bonding atoms also referred to as the … Read more
What Is A Colloid? A colloid is a mixture with particles ranging between 1 and 1000 nanometers in diameter and still able to remain evenly distributed throughout the solution. In colloids the substances remain dispersed and do not settle to the bottom of the container. The colloid particles are generally larger than those in a … Read more
Overview Argon is a chemical element with the symbol (Ar) and atomic number 18. It is in group 18 of the periodic table together with Helium (He), Neon (Ne), Krypton (Kr), Xenon (Xe) and Radon (Rn). They are generally categorized as noble gases. Argon is colorless, odorless, tasteless, nontoxic and nonflammable gas. It is chemically … Read more
Bunsen burner is named after Robert Bunsen, a German chemist who introduced it in 1885. It is a common piece of laboratory equipment that produces a single open gas flame which is used for heating, sterilizing or combustion. The gas can be natural gas or a liquefied petroleum gas such as propane, butane or a … Read more
Overview Bismuth is a chemical element with the symbol Bi and atomic number 83. Bismuth is hard, brittle, lustrous and coarsely crystalline. It can be distinguished from all other metals by its color- gray-white with a reddish tinge. Bismuth is usually mixed with other metals such as lead, tin, iron or cadmium to form low-melting … Read more
Isopropyl bromide also referred to as 2-Bromopropane or 2-propyl bromide, is the halogenated hydrocarbon with the formula CH3CHBrCH3. It is a colorless liquid, insoluble in water but soluble in ethanol and ether. T is used for introducing the isopropyl functional group in organic synthesis. 2-Bromopropane is prepared by heating Isopropanol with hydrobromic acid. Properties Isopropyl … Read more
Overview Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water and is a precursor to almost all fluorine-containing compounds. It is a colorless solution that is highly corrosive, capable of dissolving many materials especially oxides. Hydrogen fluoride also shows moderate reactivity toward many metals and has the ability to dissolve glass. Due to … Read more