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What is scalar quantity?
Those physical quantities that completely described by their magnitude only
Examples: Work,Power etc

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Special types of microscopes

Source: Wikipedia Dark ground microscope: It is also called dark field illumination microscope. There are certain microorganisms, which are very difficult to stain example spirochetes. To visualize them under microscope dark field illumination is used. The microorganism appears bright against a dark background. It is similar to dust particle seen in a beam of light from a ventilator in a dark room. In this microscope a special condenser with a central black area is placed just behind the objective. A dark ground, phase contrast microscope can be made from an ordinary microscope. For this, cut out a thick talc sheet of the size of a filter. Colour the central two third with black ink. Place it along the filter in the holder below the condenser Fluorescent microscope: Certain dyes have the characteristic of glowing when exposed to ultraviolet light. In fluorescent microscope the object is stained with these (fluorochrome) dyes. The light source of microscope is replaced with the source t

Classification of Bacteria / Microbiology

Source: MicrobiozIndia.com Microorganism are very small microscopic structures that are capable of free living. Some of the the microorganisms are non-pathogenic and live on the body of human beings i.e on the skin, in the nostrils, in the intestinal tract etc and they are called COMMENSALS. The organism that are capable of causing disease are called pathogenic organisms. There are two groups depending upon the structure of cells 1-Prokaryotic 2-Eukaryotic Prokaryotes: This group includes those organisms that have a very simple cell structure and nuclear material in the form of single chromosome but is not surrounded by nuclear membrane. They devide by simple binary fusion. Examples are bacteria, Mycoplasma, chlamydia and rickettsiae. Eukarotes: These organisms have complete cell structure similar to higher organisms. The nuclear material is bounded by a nuclear membrane to form a nucleus. They have more then one chromosome,complete enzymr system of their own and devide by mitosis E

Poison dart frog an overview

Poison dart frog: Image source: Dirk Ercken /Shutterstock Other common names: dart-poison frog and poison frog Scientific name: Dendrobatidae Class: Amphibia Phylum: Chordata Order: Anura Kingdom: Animalia Diet: Carnivore Poison dart frogs store an alkaloid toxin called batrachotoxin in skin glands. There are more then 100 species of poison dart frog. Most toxic frog: Golden poison dart frog considered to be most toxic of all poisonous frog because it has the ability to kill 10 grown men. Scientific name of golden dart frog is Phyllobates terribilis. Golden dart frog is endagered species due to habitat loss and pollution Size: They have small size. Their size varies from 1.5cm to 6cm long Habitat: They live in wet and tropical forest or we can say in rain forests of central and south america Why they are known as dart frogs: Because poison of Black-legged Poison Dart Frog,Golden Poison Dart Frog and kokoe poison dart frog have been used by humans to poison dart Life spa

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