NationMaster - Encyclopedia: Cuvette

A cuvette is a kind of laboratory glassware, usually a small tube of circular or square cross section, sealed at one end, made of plastic, glass, or optical grade quartz and designed to hold samples for spectroscopic experiments. The best cuvettes are as clear as possible, without impurities that might affect a spectroscopic reading. Like a test tube, a cuvette may be open to the atmosphere on top or have a glass or Teflon cap to seal it shut. Parafilm can also be used to seal it. Cuvette is a region of the Republic of the Congo in the central part of the country. ... Image File history File links Metadata Size of this preview: 536 Ã— 600 pixelsFull resolution (953 Ã— 1066 pixel, file size: 210 KB, MIME type: image/jpeg) Common coin diameters for reference: Deutsch | English | +/- File historyClick on a date/time to view the file as it appeared at that time. ... Image File history File links Metadata Size of this preview: 536 Ã— 600 pixelsFull resolution (953 Ã— 1066 pixel, file size: 210 KB, MIME type: image/jpeg) Common coin diameters for reference: Deutsch | English | +/- File historyClick on a date/time to view the file as it appeared at that time. ... In physics, spectrophotometry is the quantitative study of spectra. ... The structure of part of a DNA double helix Deoxyribonucleic acid, or DNA, is a nucleic acid molecule that contains the genetic instructions used in the development and functioning of all known living organisms. ... Ribonucleic acid or RNA is a nucleic acid polymer consisting of nucleotide monomers that plays several important roles in the processes that translate genetic information from deoxyribonucleic acid (DNA) into protein products; RNA acts as a messenger between DNA and the protein synthesis complexes known as ribosomes, forms vital portions... The United States one-cent coin is a unit of currency equaling one-hundredth of a United States dollar. ... Brown glass jars with some clear lab glassware in the background Laboratory glassware refers to a variety of equipment, traditionally made of glass, used for scientific experiments and other work in science, especially in chemistry and biology laboratories. ... This article or section does not cite any references or sources. ... This article is about the material. ... For other uses, see Quartz (disambiguation). ... Extremely high resolution spectrogram of the Sun showing thousands of elemental absorption lines (fraunhofer lines) Spectroscopy is the study of the interaction between radiation (electromagnetic radiation, or light, as well as particle radiation) and matter. ... A test tube (Sometimes culture tube) is a kind of laboratory glassware, composed of a fingerlike length of glass tubing, open at the top, sometimes with a rounded lip at the top, and a rounded U shaped bottom. ... Teflon is polytetrafluoroethylene (PTFE), a polymer of fluorinated ethylene. ... Perhaps one of the most ubiquitous of laboratory items, Parafilm is a product of the American Can Company, consisting of a flexible film, available in several different lengths and widths, that is commonly used for sealing or protecting vessels. ...

Inexpensive cuvettes are round and look similar to test tubes. Disposable plastic cuvettes, while not as pure as glass or quartz versions, are often used in fast spectroscopic assays, where speed is more important than high accuracy. In the fields of science, engineering, industry and statistics, accuracy is the degree of conformity of a measured or calculated quantity to its actual (true) value. ...

Some cuvettes will be clear only on opposite sides, so that they pass a single beam of light through that pair of sides; often the unclear sides have ridges or are rough to allow easy handling. Cuvettes to be used in fluorescence spectroscopy are clear on all four sides. Some cuvettes, known as tandem cuvettes, have a glass barrier that extends 2/3 up inside, so that measurements can be taken with two solutions separated, and again when they are mixed. Typically, cuvettes are one cm across, to allow for easy calculations of coefficients of absorption. Fluorescence spectroscopy or fluorometry is a type of electromagnetic spectroscopy used for analyzing fluorescent spectra. ... Making a saline water solution by dissolving table salt (NaCl) in water This article is about chemical solutions. ... This article is being considered for deletion in accordance with Wikipedias deletion policy. ...

Cuvettes to be used in circular dichroism experiments should never be mechanically stressed, as the stress will induce birefringence in the quartz and affect the measurements made. Circular dichroism (CD) is a form of spectroscopy based on the differential absorption of left- and right-handed circularly polarized light. ... A calcite crystal laid upon a paper with some letters showing the double refraction Birefringence, or double refraction, is the decomposition of a ray of light into two rays (the ordinary ray and the extraordinary ray) when it passes through certain types of material, such as calcite crystals, depending on...

Category: Laboratory glassware An agar plate streaked with microorganisms isolated from a deep-water sponge. ... A copper aspirator. ... Front loading autoclaves are common Stovetop autoclaves need to be monitored carefully and are the simplest of all autoclaves Multiple large autoclaves are used for processing substantial quantities of laboratory equipment prior to reuse, and infectious material prior to disposal. ... Look up Bunsen burner in Wiktionary, the free dictionary. ... A calorimeter is a device used for calorimetry, the science of measuring the heat of chemical reactions or physical changes as well as heat capacity. ... An electronic bacterial colony counter. ... A colorimeter is a device used to measure the absorbance of a specific solution. ... A laboratory tabletop centrifuge A laboratory centrifuge is a piece of laboratory equipment, driven by a motor, which spins liquid samples at high speed. ... A common modern fume hood. ... A glove compartment is a compartment built into the dashboard on the passengers side of an automobile, often used for miscellaneous storage. ... In microbiology, an incubator is a device for controlling the temperature, humidity, and other conditions in which a microbiological culture is being grown. ... A laboratory equipment for the homogenization of various types of material, such as tissue, plant, food, soil, and many others. ... UV light desinfects the sterile laminar flow cabinet when not in use Laminar flow cabinet or laminar flow closet is a carefully enclosed bench designed to prevent contamination of semiconductor wafers, biological samples, or any particle sensitive device. ... A magnetic stirrer is a type of laboratory equipment consisting of a rotating magnet or stationary electomagnets creating a rotating magnetic field. ... Robert Hookes microscope (1665) - an engineered device used to study living systems. ... A 96-well microtiter plate. ... Plate readers (also know as microplate readers) are laboratory instruments designed to detect biological, chemical or physical events in samples stored in microtiter plates. ... Spectrophotometer In physics, spectrophotometry is the quantitative study of electromagnetic spectra. ... A stir bar (or flea) is a magnetic bar, used to stir a chemical reaction mixture or solution in a laboratory. ... A common mercury thermometer A thermometer is a device that measures temperature or temperature gradient, using a variety of different principles. ... A Mini-Vortexer with micro-centrifuge tube. ... Three static mixers: The top is an alternating spiral with each spiral offset by 90Â°; the second is the above in a delivery tube, such as for epoxy; the last is a larger metal mixer used to divide a flow into streams that intersect at 90Â°. - Static Mixers use the... Brown glass jars with some clear lab glassware in the background Laboratory glassware refers to a variety of equipment, traditionally made of glass, used for scientific experiments and other work in science, especially in chemistry and biology laboratories. ... A beaker is a simple container for liquids, very commonly used in laboratories. ... A large, thick-walled laboratory tube used for strongly heating substances with a Bunsen burner or other heat source. ... A BÃ¼chner funnel connected to a flask with a tube leading to a vacuum pump BÃ¼chner funnel is a piece of laboratory equipment used in suction filtration. ... A burette (also buret) is a vertical cylindrical piece of laboratory glassware with a volumetric graduation on its full length and a precision tap, or stopcock, on the bottom. ... Cold fingers. ... Two different condensers are seen here: a Vigreux condenser is used as a fractionating column on left, and a Liebig condenser cools the hot vapors to liquid on right In a laboratory, a condenser is a piece of laboratory glassware used to cool hot vapors or liquids. ... A conical measure is a type of laboratory glassware which consists of a conical cup with a notch on the top to allow for the easy pouring of liquids. ... For other uses, see Crucible (disambiguation). ... Erlenmeyer flasks from the Argonne National Laboratory glassblowing shop. ... Conical flask For the episode of The X-Files, see The Erlenmeyer Flask. ... Round-bottom flasks are types of flasks having spherical bottoms used as laboratory glassware, mostly for chemical or biochemical work. ... Florence flask A Florence flask (also known as a round bottom flask or a boiling flask) is a piece of laboratory glassware. ... A volumetric flask. ... A BÃ¼chner funnel connected to a flask with a tube leading to a vacuum pump A BÃ¼chner flask, also known as a vacuum flask, is a thick-walled erlenmeyer flask with a glass tube and hose barb protruding about an inch from its neck, connected to an aspirator. ... A beautiful retort. ... A gas syringe showing its components separate and together A gas syringe also known as glass collecting bottle, is a piece of laboratory glassware used to draw a volume of a gas from a beaker or other closed system, or measure the volume of gas given off in a reaction. ... right|thumb|100px|Graduated cylinder. ... Glass Tube, a tube made of glass used for carrying gases between pieces of apparatus during a laboratory experiment. ... An NMR tube filled with a colorless sample, sealed with a green polyethylene cap and Parafilm Left to right: Flame, septum and polyethylene cap sealed NMR tubes Aqua regia has been added to these NMR tubes to remove all traces of organic material. ... This article is about the laboratory instrument. ... Man looking at fungus inside of petri dishes A Petri dish is a shallow glass or plastic cylindrical dish that biologists use to culture microbes. ... The pycnometer or pyknometer is a device used for measuring fluid density, also known as a specific gravity bottle. ... Separating funnel A separating funnel or separation funnel or separatory funnel is a piece of equipment used in science to separate two immiscible liquids or solutions of different densities. ... A schematic representation of a Soxhlet extractor A Soxhlet extractor is a type of laboratory glassware invented in 1879 by Franz von Soxhlet. ... A test tube (Sometimes culture tube) is a kind of laboratory glassware, composed of a fingerlike length of glass tubing, open at the top, sometimes with a rounded lip at the top, and a rounded U shaped bottom. ... A thistle tube is a piece of laboratory glassware consisting mostly of a shaft of tube, with a reservoir and funnel-like section at the top. ... Caesium fluoride sample on a watch glass A watch glass is a circular, slightly concave piece of glass used in chemistry as a surface to evaporate a liquid, or as a cover for a beaker. ...