chemical alteration

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• Altération (géologie) — En géologie, l altération est l ensemble des transformations minéralogiques d une roche à la surface, lorsqu elle est exposée aux effets de l eau. L altération est donc d autant plus importante que l eau est abondante. Elle est une des… …   Wikipédia en Français

• Chemical resistance — The chemical resistance of a material or surface can be determined in compliance with ISO 2812 Paints and varnishes – Determination of resistance to liquids – Part 1: Immersion in liquids other than water (ISO 2812 1:2007[1]); German Version EN… …   Wikipedia

• alteration mineral assemblages — GLOSSARY OF VOLCANIC TERMS Mineral assemblages found in rocks that result from chemical reactions between the original rock and an agent of alteration (for example, hot volcanic vapors or hydrothermal fluids) …   Glossary of volcanic terms

• alteration theory — Explanation of the phenomenon of electromotive forces of nerve and muscle by changes in chemical composition of tissue in cross section …   Dictionary of invertebrate zoology

• drug — drug1 /drug/, n., v., drugged, drugging. n. 1. Pharm. a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well being. 2. (in federal law) a. any substance… …   Universalium

• Drug — /droog/, n. Zoroastrianism. the cosmic principle of disorder and falsehood. Cf. Asha. [ < Avestan drauga] * * * I Any chemical agent that affects the function of living things. Some, including antibiotics, stimulants, tranquilizers,… …   Universalium

• diagenesis — diagenetic /duy euh jeuh net ik/, adj. /duy euh jen euh sis/, n. Geol. the physical and chemical changes occurring in sediments between the times of deposition and solidification. [1885 90; < NL; see DIA , GENESIS] * * * Sum of all processes,… …   Universalium

• weathering — /wedh euhr ing/, n. 1. Archit. wash (def. 48). 2. material used as a weather strip. 3. Geol. the various mechanical and chemical processes that cause exposed rock to decompose. [1655 65; WEATHER + ING1] * * * Physical disintegration and chemical… …   Universalium

• Metasomatism — is the chemical alteration of a rock by hydrothermal and other fluids. Metasomatism can occur via the action of hydrothermal fluids from an igneous or metamorphic source. Metasomatic albite + hornblende + tourmaline alteration of metamorphosed… …   Wikipedia

• Hair care — is an overall term for parts of hygiene and cosmetology involving the hair on the human head. Hair care will differ according to one s hair type and according to various processes that can be applied to hair. All hair is not the same; indeed,… …   Wikipedia

• Carbonates on Mars — Evidence for carbonates on Mars has remained elusive. For example, in spite of remote sensing instruments such as OMEGA and THEMIS that are sensitive to infrared emissivity spectral features of carbonates, carbonate outcrops have not been… …   Wikipedia