Tuberculin Skin Test (also known asMantoux Test, PPD Test or Mendel-Mantoux Test or Pirquet test) is a screening test done on the skin for diagnosis of Tuberculosis (TB) using Purified Protein Derivative (PPD). A Positive Tuberculin skin test is an example of type 4 hypersensitivity reaction (A delayed hypersensitivity Skin reaction) that is, it is cell …
Non Renewable Energy resources are energy sources that can be depleted with use and which cannot be replenished. Non Renewable Energy resources and Renewable energy resources are both Natural resources and are used for generating energy (hence they are also called Non Renewable Fuels) in various forms such as electrical energy or heat energy. …
Continental driftis defined as the movement of the Earth’scontinentsrelative to each other, appearing to “drift” across the ocean bed. Continental drift theory was initially proposed byAbraham Orteliusin 1596 and was later developed fully by a geophysicist and meteorologist,Alfred Wegenerin 1912. This theory explains that the earths continent move gradually over the surface …
Challenges of doing business in Nigeria are many and these problems affect the growth of the economy of Nigeria as well as making it difficult for investors to invest in Nigeria. The major problems of doing business in Nigeria include: Problem of Unstable Power is the most important challenge of doing business …
Snake Bite is a medical emergency that needs rapid first aid and treatment to prevent the venom from circulating to the heart and other organs of the body. There are over 2700 species of snakes worldwide and only about 500 of these species are venomous (Rattlesnake, Cobra, Tree Snakes, etc); this means …
Humans, animals, and plants are globally distributed in ecology according to biotic and abiotic factors. These are termed cosmopolitan in their distribution. Some other animals have restricted distribution and they are said to be endemic. There are some plants such as coconuts (Cocos nucifera) which have a very wide endemic range which …
What is a Renewable Energy Resource? Renewable energy is a form of energy that can be replenished. Renewable energy is infinite and continues to be available even as it is being used continuously. It is like an unending source of energy. Renewable energy is a form of Natural resources. There are different …
Liver Biopsy is a procedure in which a tiny piece of a tissue of the liver is taken using a biopsy needle. It is a safe procedure and is rarely dangerous in the hands of experienced doctors. There are reasons for liver biopsy as outlined below. Liver Biopsy Procedure First check the …