Cortisol, a steroid, is secreted by the adrenal cortex. It acts on the kidneys or renal tubules to maintain the Na+- K+ balance. It is also... View Article
CH3OCH3 is an example of ether.  Ethers are also important in medicine and pharmacology, especially for use as anaesthetics. It is a colourless... View Article
Phenol is used in the manufacture of drugs like Aspirin (2-Acetoxy-benzoic acid). Aspirin is now the most commonly used drug in the world. Its... View Article
The S.I. unit of force is Newton. F = ma 1 Newton = 1 kg x 1 m/s2 It is defined as an external cause that changes or tends to change the... View Article
The amplitude of a wave is the maximum distance moved by the particles of a medium on either side of the mean position. Amplitude is the... View Article
Multimolecular(particle size < 1Â nm), they aggregate together and form colloid, e.g. gold sol which is a negatively charged sol. Sol is a... View Article
Sound waves are longitudinal waves and consists of compression and rarefaction. Because of the air particles' longitudinal motion, there are... View Article
Twitch or muscle twitch is a term used for muscle contraction. Most muscles are made up of two kinds of muscle fibres that help you move your... View Article
An Arrhenius acid is that of any substance that ionizes when it dissolves in water to give the H+Â or hydrogen ion. An Arrhenius base is any... View Article
Pascal is the SI unit of pressure. It is denoted as Pa and defined as the force of one newton per square meter: The SI was established in 1960... View Article
Siderite is an ore of iron. Its molecular formula is FeCO3. Siderite that is also called chalybite, iron carbonate (FeCO3 ), is a widespread... View Article
Breathing is controlled by the medulla oblongata The work of breathing is done by the diaphragm, the muscles between the ribs (intercostal... View Article
Thylakoids are disc-shaped structures present in the chloroplast. They stack up to form the grana. Thylakoids are the sites for oxygenic... View Article
Wrought iron is the purest form of iron. Wrought iron is composed primarily of iron with 1 to 2% of added slag, the by-product of iron ore... View Article
Leclanche cell. A cell is a single electrical energy source that uses chemical reactions to produce a current. A primary cell or battery... View Article
The work function of a metal is the minimum amount of energy required to start the emission of electrons from the metal's surface. The work... View Article
A catalyst does not affect the energy of reactants, the energy of products and enthalpy change of a reaction. Catalysis is the backbone of many... View Article
Milk is a colloidal solution that appears to be homogeneous but actually is heterogeneous. Colloids are mixtures whose particles are larger... View Article
