Inventors and Scientific Discoveries

Peter Mitchell proposed the chemiosmotic hypothesis in 1961, which explains how ATP is synthesized through the flow of protons across a membrane. Paul D. Boyer and John E. Walker worked on ATP synthase mechanism, while Friedrich Miescher discovered DNA.

Restriction enzymes (also called restriction endonucleases) were discovered by Hamilton Smith and Daniel Nathans in 1970, building on earlier work by Werner Arber. They shared the 1978 Nobel Prize in Medicine for this discovery. Alexander Fleming discovered penicycin, Berg was a pioneer in recombinant DNA technology, and Waksman discovered streptomycin.

The term parthenogenesis (development of an embryo from an unfertilized egg) was coined by Sir Richard Owen in 1849. The term comes from Greek words meaning 'virgin birth.' Other scientists listed made different contributions: Boveri studied chromosomes, Balfour worked on embryology, and the correct spelling should likely be 'Dobell' for a protozoologist, not 'Grobber.'

Sutton and Boveri proposed the chromosomal theory of inheritance around 1902-1903, establishing that chromosomes are the carriers of genetic material. Mendel discovered inheritance laws earlier but didn't know about chromosomes. Morgan later demonstrated chromosomes' role with fruit fly experiments.

The Kardex system was devised by Remington Rand of India Ltd. Kardex is a visible card filing system used for record-keeping in libraries and other organizations. The system uses cards arranged in visible file drawers, allowing quick access to information. Remington Rand, a major office equipment company, developed and marketed this system for efficient information management before computerization became widespread.

The POSDCORB formula (Planning, Organizing, Staffing, Directing, Coordinating, Reporting, and Budgeting) was developed by Luther Gulick and Lyndall Urwick in 1937 as a framework for public administration. While Henry Fayol developed management principles, the specific POSDCORB acronym and formulation came from Gulick and Urwick's work with the Brownlow Committee.

Louis Pasteur developed the first rabies vaccine in 1885. While the rabies disease was known since ancient times, Pasteur's work on the vaccine and his treatment of Joseph Meister established him as the pioneering scientist associated with rabies in medical history.

Miller and Urey conducted their famous 1953 experiment simulating early Earth conditions (water, methane, ammonia, hydrogen, electrical sparks) and successfully produced amino acids - the building blocks of life. Oparin had earlier proposed the theoretical primordial soup concept, but Miller-Urey provided the experimental evidence. Lamarck and De Vries worked on different evolutionary mechanisms.

Louis Braille invented the Braille script in 1824, a tactile writing system for the blind. Gutenberg invented the printing press, and 'Scolt' appears to be a typo or incorrect option. The Braille system revolutionized reading and writing for visually impaired people.

Samuel Hahnemann, a German physician, developed homeopathy in the late 18th century based on the principle of 'like cures like.' His work laid the foundation for this alternative system of medicine that remains popular today.

Karl Landsteiner discovered the Rh (Rhesus) factor in 1937 while working with Rhesus monkey blood cells, building on his earlier discovery of ABO blood groups. Harvey studied circulation, Watson and Crick discovered DNA structure, and Darlington worked on chromosomes - none discovered the Rh factor.

Sir J.A. Fleming invented the vacuum tube (thermionic valve), which is commonly referred to as the 'valve' in British English terminology. James Watt invented the steam engine, and C. Sholes invented the typewriter. Fleming's invention of the diode valve in 1904 was crucial for radio detection and amplification. This question tests knowledge of early radio technology pioneers.

E. G. Otis (Elisha Graves Otis) invented the safety elevator in 1852, which revolutionized vertical transportation. His key invention was the safety brake that prevented the elevator from falling if the hoisting cable failed, making elevators safe for public use in buildings. This invention enabled the construction of modern skyscrapers.