Uranium
Uranium () is a white/black metal lic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92. It has 92 proton s and electron s, 6 of them valence electron s. It can have between 141 and 146 neutron s, with 143 and 146 in its most co more
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD+, is a coenzyme found in all living cell s. The compound is a dinucleotide, since it consists of two nucleotide s joined through their phosphate groups: with one nucleotide containing an adenosine ring, and the more
Immune system image of a single neutrophil (yellow), engulfing anthrax bacteria (orange).
An immune system is a collection of mechanisms within an organism that protects against disease by identifying and killing pathogen s and tumor cells. It detects a wide variety of agents, from virus es to more
Charles Darwin
Charles Robert Darwin (12 February 1809 – 19 April 1882 ) was an English naturalist . After becoming eminent among scientists for his field work and inquiries into geology , he proposed and provided scientific evidence that all species of life have evolved over time f more
Tuberculosis
Tuberculosis (abbreviated as TB for tubercle bacillus or Tuberculosis) is a common and deadly infectious disease caused by mycobacteria , mainly Mycobacterium tuberculosis . Tuberculosis most commonly attacks the lungs (as pulmonary TB) but can also affect the central nervous syst more