amino-acid racemization

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• Amino acid dating — is a technique used to estimate age in a wide variety ofsituations. This technique relates changes in amino acid molecules to thetime elapsed since they were formed. This technique is used in paleobiology, archaeology, forensic science, and… …   Wikipedia

• Amino acid — This article is about the class of chemicals. For the structures and properties of the standard proteinogenic amino acids, see Proteinogenic amino acid. The generic structure of an alpha amino acid in its unionized form …   Wikipedia

• racemization — Partial conversion of one enantiomorph into another (as an l amino acid to the corresponding d amino acid) so that the specific optical rotation is decreased, or even reduced to zero, in the resulting mixture. * * * ra·ce·mi·za·tion also Brit… …   Medical dictionary

• Absolute dating — is the process of determining a specific date for an archaeological or palaeontological site or artifact. Some archaeologists prefer the terms chronometric or calendar dating, as use of the word absolute implies a certainty and precision that is… …   Wikipedia

• Dating methodologies in archaeology — Dating material drawn from the archaeological record can be made by a direct study of an artifact or may be deduced by association with materials found in the context the item is drawn from or inferred by its point of discovery in the sequence… …   Wikipedia

• Dating methodology (archaeology) — Dating material drawn from the archaeological record can made by a direct study of an artifact or may be deduced by association with materials found in the context the item is drawn from or inferred by its point of discovery in the sequence… …   Wikipedia

• Bowhead whale — Bowhead whale[1] Size comparison against an average human …   Wikipedia

• Kabwe skull — Infobox fossil catalog number = Broken Hill 1 common name = Kabwe cranium or Broken Hill man species = Homo rhodesiensis or Homo heidelbergensis age = place discovered = Kabwe, Zambia date discovered = 1921 discovered by = Tom ZwiglaarKabwe skull …   Wikipedia

• Archaic Homo sapiens — Dawn men redirects here. For the stone circle, see Dawn s Men. Homo rhodesiensis Broken Hill Cranium : dated to either 130,000 years ago (using amino acid racemization determination) or 800,000 to 600,000 years ago (within the same time as Homo… …   Wikipedia

• Control of fire by early humans — A reconstruction of Homo erectus, the earliest human species that is known to have controlled fire The control of fire by early humans was a turning point in the cultural aspect of human evolution that allowed humans to cook food and obtain… …   Wikipedia

• Policarp Hortolà — Saltar a navegación, búsqueda Policarp Hortolà i Gómez es un biólogo catalán, nacido en Badalona, España en 1958 que descubrió y sistematizó las distintas morfologías de los eritrocitos, glóbulos rojos de la sangre, en las manchas de sangre de… …   Wikipedia Español