reagent change

См. также в других словарях:

• Marquis reagent — The Marquis reagent is used as a simple spot test to presumptively identify alkaloids as well as other compounds. It is composed of a mixture of formaldehyde and concentrated sulfuric acid, which is dripped onto the substance being tested. The… …   Wikipedia

• Ehrlich's reagent — (p dimethyl aminobenzaldehyde dissolved in 20% HCL). It is used for detection of urobilinogen in fresh cool urine.If urine sample is left to oxidize in air to form urobilin the reagent will not detect the urobilinogen.By adding few drops of… …   Wikipedia

• Melzer's reagent — (also known as Melzer s solution or informally as Melzer s) is a chemical reagent used by mycologists to assist with the identification of fungi. Contents 1 Composition 2 Reactions 3 History 4 References …   Wikipedia

• analysis — /euh nal euh sis/, n., pl. analyses / seez /. 1. the separating of any material or abstract entity into its constituent elements (opposed to synthesis). 2. this process as a method of studying the nature of something or of determining its… …   Universalium

• reaction mechanism — Introduction       in chemical reactions (chemical reaction), the detailed processes by which chemical substances are transformed into other substances. The reactions themselves may involve the interactions of atoms (atom), molecules (molecule),… …   Universalium

• Titration — [ frame|Titration setup: the titrant drops from the burette into the analyte solution in the flask. An indicator present then changes color permanently at the endpoint.] Titration is a common laboratory method of quantitative chemical analysis… …   Wikipedia

• test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… …   Medical dictionary

• reaction — 1. The response of a muscle or other living tissue or organism to a stimulus. 2. The color change effected in litmus and certain other organic pigments by contact with substances such as acids or alkalies; also the property that such substances… …   Medical dictionary

• Chemical equilibrium — In a chemical reaction, chemical equilibrium is the state in which the concentrations of the reactants and products have not yet changed with time. It occurs only in reversible reactions, and not in irreversible reactions. Usually, this state… …   Wikipedia

• Chemical biology — is a scientific discipline spanning the fields of chemistry and biology that involves the application of chemical techniques and tools, often compounds produced through synthetic chemistry, to the study and manipulation of biological systems.… …   Wikipedia

• Chemical tests in mushroom identification — are methods that aid in determining the variety of some fungi. The most useful tests are Melzer s reagent and potassium hydroxide. Contents 1 Ammonia 2 Iron salts 3 Meixner test for amatoxins …   Wikipedia