public library of science scientists

Study of photosynthesis and the factors affecting it helps us understand the most important biochemical life sustaining processes. All plants and animals are dependent on the sun for energy. This energy is made available to them by the process of photosynthesis. Man, like other animals, is depende..

In 1885, Sir William Crookes carried out a series of investigations into the behaviour of metals heated in a vacuum. The experiment of Crookes and others showed that a heated cathode produced a stream of radiation, which could cause gases at low pressure to glow and which made other substances emi..

DNA is a double stranded molecule (double helix) with each strand being made up of many nucleotide units. Each nucleotide is made up of a nitrogenous base, a sugar molecule and a phosphoric acid molecule. Each DNA molecule has two such polynucleotide chains joined to each other by hydrogen bonds. ..

Force Acting on a Current-Carrying Conductor in a Magnetic Field - Oersted's experiment shows that a current carrying wire exerts a force on a magnetic needle and deflects it from its usual north-south position. The reverse must also be true, which was proved by the French scientist Andre..

The incident ray, the refracted ray and the normal to the surface at the point of incidence all lie in one plane. For any two given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. The above law is called Snell's law after the ..

.B can effect lymph, intense or other organs BCC vaccine. Milch cows to be immunized against the disease. Spitting in public places to be banned ATT (Anti Tubercular Therapy) to be administered Cholera Caused by bacterium vibrio cholera, transmitted by flies, is also water borne Vomiting,..

Electromagnetic Induction - Michael Faraday the English scientist was the first person to prove that a magnet can create a current To test this he moved a magnet towards and away from the coil of wire connected to a galvanometer He observed that there was a deflection in the galvanometer ..

Structure of Atom - When scientists started exploring matter, they discovered that the smallest particle of an element that maintains its chemical identity through all chemical and physical changes is called and 'atom'. Just how small these atoms are can be made out if you realize that th..

Laws of Refraction - The incident ray, the refracted ray and the normal to the surface at the point of incidence all lie in one plane. For any two given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. The second law is called Snel..

A librarian has a record of the number of books on each subject present in the library. Find the number of books on Science present in the library. => 20 or 22 or 24 or 23..