universe84a

Introduction of Microorganisms Microorganisms are minute living organisms those only observable under a microscope. They are bacteria, viruses, fungus, and parasites( protozoa and helminths). Helminths are metazoa i.e. multicellular organisms even they are part of microorganisms because some structures ( egg or larvae) are only observable under the microscope. All organisms are seen under a light compound microscope except viruses. Viruses are the smallest organisms (20 nm  -200 nm). This is the reason to observe need...

Bacteria special tests Bacteria special tests are useful characteristic tests for presumptive identification of various bacteria as shown below. Hanging drop preparation-motility test:  It is the most common test of bacteria to check whether organism motile non-motile ( having flagella or not). If the bacteria are motile, notice for the type of motility e.g. darting motility for Vibrio cholerae and Helicobacter pylori, tumbling motility for Listeria monocytogenes, stately motility for Clostridium, Spinning motility for Fusobacterium gyrans, and gliding motility...

Two indicators media Outlines of the topic two indicators media are introduction and use. Medium carrying two indicators are the most common question asking in the examination as viva, therefore today we concern with those media as shown below. Two indicators medium are: 1. Hekton enteric agar It contains two indicators a)acid fuchsin and b) bromothymol blue. Introduction:  Hektoen enteric agar(HEA) is named after the Hektoen Institute in Chicago, where researchers developed the agar. It is a...