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Denatured Alcohol
Denatured alcohol, also known as methylated spirits, metho, or meths in Australia, Ireland, New Zealand, South Africa, and the United Kingdom, and as Rectified spirit, denatured rectified spirit, is ethanol that has additives to make it poisonous, bad-tasting, foul-smelling, or Vomiting#Emetics, nauseating to discourage its alcohol consumption, recreational consumption. It is sometimes dyed so that it can be identified visually. Pyridine and methanol, each and together, make denatured alcohol poisonous; denatonium makes it bitter. Denatured alcohol is used as a solvent and as fuel for alcohol burners and camping stoves. Because of the diversity of industrial uses for denatured alcohol, hundreds of additives and denaturing methods have been used. The main additive usually is 10% methanol (methyl alcohol), hence the name ''methylated spirits''. Other common additives include isopropyl alcohol, acetone, Butanone, methyl ethyl ketone, and methyl isobutyl ketone. Denaturation (food), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemical Structure
A chemical structure of a molecule is a spatial arrangement of its atoms and their chemical bonds. Its determination includes a chemist's specifying the molecular geometry and, when feasible and necessary, the electronic structure of the target molecule or other solid. Molecular geometry refers to the spatial arrangement of atoms in a molecule and the chemical bonds that hold the atoms together and can be represented using structural formulae and by molecular models; complete electronic structure descriptions include specifying the occupation of a molecule's molecular orbitals. Structure determination can be applied to a range of targets from very simple molecules (e.g., diatomic oxygen or nitrogen) to very complex ones (e.g., such as protein or DNA). Background Theories of chemical structure were first developed by August Kekulé, Archibald Scott Couper, and Aleksandr Butlerov, among others, from about 1858. These theories were first to state that chemical compounds are not a ran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nucleic Acid
Nucleic acids are large biomolecules that are crucial in all cells and viruses. They are composed of nucleotides, which are the monomer components: a pentose, 5-carbon sugar, a phosphate group and a nitrogenous base. The two main classes of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). If the sugar is ribose, the polymer is RNA; if the sugar is deoxyribose, a variant of ribose, the polymer is DNA. Nucleic acids are chemical compounds that are found in nature. They carry information in cells and make up genetic material. These acids are very common in all living things, where they create, encode, and store information in every living cell of every outline of life forms, life-form on Earth. In turn, they send and express that information inside and outside the cell nucleus. From the inner workings of the cell to the young of a living thing, they contain and provide information via the nucleic acid sequence. This gives the RNA and DNA their unmistakable 'la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Precipitation (chemistry)
In an aqueous solution, precipitation is the "sedimentation of a solid material (a precipitate) from a liquid solution". The solid formed is called the precipitate. In case of an inorganic chemical reaction leading to precipitation, the chemical reagent causing the solid to form is called the precipitant. The clear liquid remaining above the precipitated or the centrifuged solid phase is also called the supernate or supernatant. The notion of precipitation can also be extended to other domains of chemistry (organic chemistry and biochemistry) and even be applied to the solid phases (e.g. metallurgy and alloys) when solid impurities segregation (materials science), segregate from a solid phase. Supersaturation The precipitation of a compound may occur when its concentration exceeds its solubility. This can be due to temperature changes, solvent evaporation, or by mixing solvents. Precipitation occurs more rapidly from a strongly supersaturated solution. The formation of a pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molecular Biology
Molecular biology is a branch of biology that seeks to understand the molecule, molecular basis of biological activity in and between Cell (biology), cells, including biomolecule, biomolecular synthesis, modification, mechanisms, and interactions. Though cells and other microscopic structures had been observed in living organisms as early as the 18th century, a detailed understanding of the mechanisms and interactions governing their behavior did not emerge until the 20th century, when technologies used in physics and chemistry had advanced sufficiently to permit their application in the biological sciences. The term 'molecular biology' was first used in 1945 by the English physicist William Astbury, who described it as an approach focused on discerning the underpinnings of biological phenomena—i.e. uncovering the physical and chemical structures and properties of biological molecules, as well as their interactions with other molecules and how these interactions explain observ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pigovian Tax
A Pigouvian tax (also spelled Pigovian tax) is a tax on any market activity that generates negative externalities (i.e., external costs incurred by third parties that are not included in the market price). It is a method that tries to internalize negative externalities to achieve the Nash equilibrium and optimal Pareto efficiency. The tax is normally set by the government to correct an undesirable or inefficient market outcome (a market failure) and does so by being set equal to the external marginal cost of the negative externalities. In the presence of negative externalities, social cost includes private cost and external cost caused by negative externalities. This means the social cost of a market activity is not covered by the private cost of the activity. In such a case, the market outcome is not efficient and may lead to over-consumption of the product. Often-cited examples of negative externalities are environmental pollution and increased public healthcare costs assoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Duty (economics)
In economics, a duty is a target-specific form of tax levied by a state or other political entity. It is often associated with customs, in which context they are also known as tariffs or dues. The term is often used to describe a tax on certain items purchased abroad. A duty is levied on specific commodities, financial transactions, estates, etc. rather than being a direct imposition on individuals or corporations such income or property taxes. Examples include customs duty, excise duty, stamp duty, estate duty, and gift duty. Customs duty A customs duty or due is the indirect tax levied on the import or export of goods in international trade. In economics a duty is also a kind of consumption tax. A duty levied on goods being imported is referred to as an 'import duty', and one levied on exports an 'export duty'. Estate duty An estate duty (in the U.S. inheritance tax) is a tax levied on the estate of a deceased person in many jurisdictions or on the inheritance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communist Era
A communist era is a sustained period of national government by a single party following the philosophy of Marxism–Leninism. Many countries have experienced such a period of communist rule. Current communist states China The Chinese Communist Party emerged as the dominant political entity in mainland China following the Chinese Civil War of 1927–1949. On October 1, 1949, Mao Zedong declared the People's Republic of China from atop Tiananmen. Cuba Following the 1953–1959 Cuban Revolution, the new government led by Fidel Castro transitioned the country into a one-party state, with all meaningful opposition media closed to transferred to state control by the end of 1960. In 1976 a national referendum ratified a new constitution, with 97.7% in favour, which secured the Communist Party's central role in governing Cuba. Laos Communist rule in Laos began in March 1975 after the Khmer Rouge army took power with the support of the North Vietnamese after the Fall of Saigon an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central And Eastern Europe
Central and Eastern Europe is a geopolitical term encompassing the countries in Baltic region, Northeast Europe (primarily the Baltic states, Baltics), Central Europe (primarily the Visegrád Group), Eastern Europe, and Southeast Europe (primarily the Balkans), usually meaning former communist states from the Eastern Bloc and Warsaw Pact in Europe, as well as from former Yugoslavia. Scholarly literature often uses the abbreviations CEE or CEEC for this term. The OECD, Organisation for Economic Co-operation and Development (OECD) also uses the term "Central and Eastern European Countries" (CEECs) for a group comprising some of these countries. This term is sometimes used as an alternative to the term "Eastern Europe," for more neutral grouping. Definitions The term ''CEE'' includes the Eastern Bloc (Warsaw Pact) countries west of the post-World War II border with the former Soviet Union; the independent states in former Yugoslavia (which were not considered part of the Eastern b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Methylene Blue
Methylthioninium chloride, commonly called methylene blue, is a salt used as a dye and as a medication. As a medication, it is mainly used to treat methemoglobinemia. It has previously been used for treating cyanide poisoning and urinary tract infections, but this use is no longer recommended. Methylene blue is typically given by injection into a vein. Common side effects include headache, nausea, and vomiting. Methylene blue was first prepared in 1876, by Heinrich Caro. It is on the World Health Organization's List of Essential Medicines. Medical uses Methemoglobinemia Methylene blue is used to treat methemoglobinemia by chemically reducing the ferric iron in hemoglobin to ferrous iron. Methemoglobinemia can arise from ingestion of certain pharmaceuticals, toxins, or broad beans in those susceptible. Specifically, it is used to treat methemoglobin levels that are greater than 30% or in which there are symptoms despite oxygen therapy. Normally, through the NADH- or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crystal Violet
Crystal violet or gentian violet, also known as methyl violet 10B or hexamethyl pararosaniline chloride, is a triphenylmethane, triarylmethane dye used as a histological stain and in Gram staining, Gram's method of classifying bacteria. Crystal violet has antibacterial, Antifungal medication, antifungal, and anthelmintic (Anthelmintic, vermicide) properties and was formerly important as a topical antiseptic. The medical use of the dye has been largely superseded by more modern drugs, although it is still listed by the World Health Organization. The name ''gentian violet'' was originally used for a mixture of methyl pararosaniline dyes (methyl violet), but is now often considered a synonym for ''crystal violet''. The name refers to its colour, being like that of the petals of certain Gentiana, gentian flowers; it is not made from gentians or list of plants known as violet, violets. Production A number of possible routes can be used to prepare crystal violet. The original procedur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Methyl Violet
Methyl violet is a family of organic compounds that are mainly used as dyes. Depending on the number of attached methyl groups, the color of the dye can be altered. Its main use is as a purple dye for textiles and to give deep violet colors in paint and ink. It is also used as a hydration indicator for silica gel. Methyl violet 10B is also known as crystal violet (and many other names) and has medical uses. Structure The term methyl violet encompasses three compounds that differ in the number of methyl groups attached to the amine functional group. Methyl violets are mixtures of tetramethyl (2B), pentamethyl (6B) and hexamethyl (10B) pararosanilins. They are all soluble in water, ethanol, diethylene glycol and dipropylene glycol. : Methyl violet 2B Methyl violet 2B (IUPAC name: 4,4′-((4-Iminocyclohexa-2,5-dien-1-ylidene)methylene)bis(''N'',''N''-dimethylaniline) monohydrochloride) is a green powder which is soluble in water and ethanol but not in xylene. It appears yellow in s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
