the molecular separation
41Residual dipolar coupling — The residual dipolar coupling between two spins in a molecule occurs if the molecules in solution exhibit a partial alignment leading to an incomplete averaging of spatially anisotropic dipolar couplings.Partial molecular alignment leads to an… …
42Bird evolution — The evolution of birds is thought to have begun in the Jurassic Period, with the earliest birds derived from theropod dinosaurs. Birds are categorized as a biological class, Aves. The earliest known species of class Aves is Archaeopteryx… …
43Evolution of color vision in primates — The evolution of color vision in primates is unique compared to most eutherian mammals. While our remote vertebrate ancestors possessed trichromacy, our nocturnal, warm blooded, mammalian ancestors lost one of three cones in the retina at the… …
44Nucleic acid secondary structure — The secondary structure of a nucleic acid molecule refers to the basepairing interactions within a single molecule or set of interacting molecules, and can be represented as a list of bases which are paired in a nucleic acid molecule.[1] The… …
45History of electromagnetism — The history of electromagnetism, that is the human understanding and recorded use of electromagnetic forces, dates back over two thousand years ago, see Timeline of electromagnetism. The ancients must have been acquainted with the effects of… …
46TATA binding protein — The TATA binding protein (TBP) is a transcription factor that binds specifically to a DNA sequence called the TATA box. This DNA sequence is found about 25 30 base pairs upstream of the transcription start site in some eukaryotic gene… …
47St. Augustine Monster — The carcass as it appeared after being dug out of the sand. The St. Augustine Monster is the name given to a large unidentified carcass, originally postulated to be the remains of a gigantic octopus, that washed ashore on the United States coast… …
48Timeline of chemical elements discoveries — The discovery of the elements known to exist today is presented here in chronological order. The elements are listed generally in the order in which each was first defined as the pure element,[clarification needed] as the exact date of discovery… …
49Ecotoxicology — The term ecotoxicology was coined by René Truhaut in 1969, who defined it as the branch of toxicology concerned with the study of toxic effects, caused by natural or synthetic pollutants, to the constituents of ecosystems, animal (including… …
50PAH world hypothesis — The PAH world hypothesis is a speculative hypothesis that proposes that polycyclic aromatic hydrocarbons (PAH), assumed to be abundant in the primordial soup of the early Earth, played a major role in the origin of life by mediating the synthesis …
