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Alexander Gettler
Alexander Oscar Gettler (August 13, 1883 – August 4, 1968) was a toxicologist with the Office of Chief Medical Examiner of the City of New York (OCME) between 1918 and 1959, and the first forensic chemist to be employed in this capacity by a U.S. city. His work at OCME with Charles Norris, the chief medical examiner, created the foundation for modern medicolegal investigation in the U.S. and Gettler has been described by peers as "the father of forensic toxicology in America." The Alexander O. Gettler Award is a prize established in his name by the American Academy of Forensic Sciences. Early life and education Gettler was born Jewish in Galicia, Poland, a part of the Empire of Austria-Hungary in 1883. As Oscar Gettler, aged seven, he emigrated to the U.S. with his father, Joseph Gettler, and sister, Elise, on board the Red Star Line steamer, ''Westernland'', which arrived at the Port of New York on May 6, 1891; they settled in Brooklyn, where he was raised. He studied a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yonkers, New York
Yonkers () is a city in Westchester County, New York, United States. Developed along the Hudson River, it is the third most populous city in the state of New York, after New York City and Buffalo. The population of Yonkers was 211,569 as enumerated in the 2020 United States Census. It is classified as an inner suburb of New York City, located directly to the north of the Bronx and approximately two miles (3 km) north of Marble Hill, Manhattan, the northernmost point in Manhattan. Yonkers's downtown is centered on a plaza known as Getty Square, where the municipal government is located. The downtown area also houses significant local businesses and nonprofit organizations. It serves as a major retail hub for Yonkers and the northwest Bronx. The city is home to several attractions, including access to the Hudson River, Tibbetts Brook Park, with its public pool with slides and lazy river and two-mile walking loop Untermyer Park; Hudson River Museum; Saw Mill River daylig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbia University
Columbia University (also known as Columbia, and officially as Columbia University in the City of New York) is a private research university in New York City. Established in 1754 as King's College on the grounds of Trinity Church in Manhattan, Columbia is the oldest institution of higher education in New York and the fifth-oldest institution of higher learning in the United States. It is one of nine colonial colleges founded prior to the Declaration of Independence. It is a member of the Ivy League. Columbia is ranked among the top universities in the world. Columbia was established by royal charter under George II of Great Britain. It was renamed Columbia College in 1784 following the American Revolution, and in 1787 was placed under a private board of trustees headed by former students Alexander Hamilton and John Jay. In 1896, the campus was moved to its current location in Morningside Heights and renamed Columbia University. Columbia scientists and scholars have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Retirement Age
This article lists the statutory retirement age in different countries. Background In some contexts, the retirement age is the age at which a person is expected or required to cease work. It is usually the age at which such a person may be entitled to receive superannuation or other government benefits, like a state pension. Policymakers usually consider the demography, fiscal cost of aging, health, life expectancy, nature of the profession, supply of labor force, etc. while taking the retirement age into account. The increase in life expectancy is used in some jurisdictions as an argument to increase the age of retirement in the 21st century. Retirement age by country and region Many of the countries listed in the table below, are in the process of reforming the retirement ages (see the notes in the table for details). The ages in the table shows when an individual retires if they retire/have retired in the year given in the table. The trend in some countries is that in the f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington Square College
The New York University College of Arts & Science (CAS) is the primary liberal arts college of New York University (NYU). The school is located near Gould Plaza next to the Courant Institute of Mathematical Sciences and the Stern School of Business, adjoining Washington Square Park in Greenwich Village. As the oldest and largest college within NYU, the College of Arts & Science currently enrolls 7,660 undergraduate students (as of 2017). CAS enrolls the largest number of undergraduate students for a private liberal arts college in the United States; its size and complexity owe to NYU’s overall profile of enrolling the largest number of students in the country for a private, nonprofit, residential, and nonsectarian institution of higher education. The College of Arts & Science offers Bachelor of Arts (B.A.) and Bachelor of Science (B.S.) degrees. In the 2020 QS World University Rankings, NYU was ranked 1st in Philosophy, 10th in Mathematics, and 15th in English Language and Lite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Gut Microbiome
Gut microbiota, gut microbiome, or gut flora, are the microorganisms, including bacteria, archaea, fungi, and viruses that live in the digestive tracts of animals. The gastrointestinal metagenome is the aggregate of all the genomes of the gut microbiota. The gut is the main location of the human microbiome. The gut microbiota has broad impacts, including effects on colonization, resistance to pathogens, maintaining the intestinal epithelium, metabolizing dietary and pharmaceutical compounds, controlling immune function, and even behavior through the gut–brain axis. The microbial composition of the gut microbiota varies across regions of the digestive tract. The colon contains the highest microbial density recorded in any habitat on Earth, representing between 300 and 1000 different species. Bacteria are the largest and to date, best studied component and 99% of gut bacteria come from about 30 or 40 species. Up to 60% of the dry mass of feces is bacteria. Over 99% of the bacter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon Monoxide
Carbon monoxide (chemical formula CO) is a colorless, poisonous, odorless, tasteless, flammable gas that is slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the simplest molecule of the oxocarbon family. In coordination complexes the carbon monoxide ligand is called carbonyl. It is a key ingredient in many processes in industrial chemistry. The most common source of carbon monoxide is the partial combustion of carbon-containing compounds, when insufficient oxygen or heat is present to produce carbon dioxide. There are also numerous environmental and biological sources that generate and emit a significant amount of carbon monoxide. It is important in the production of many compounds, including drugs, fragrances, and fuels. Upon emission into the atmosphere, carbon monoxide affects several processes that contribute to climate change. Carbon monoxide has important biological roles across phylogenetic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benzene
Benzene is an organic chemical compound with the molecular formula C6H6. The benzene molecule is composed of six carbon atoms joined in a planar ring with one hydrogen atom attached to each. Because it contains only carbon and hydrogen atoms, benzene is classed as a hydrocarbon. Benzene is a natural constituent of petroleum and is one of the elementary petrochemicals. Due to the cyclic continuous pi bonds between the carbon atoms, benzene is classed as an aromatic hydrocarbon. Benzene is a colorless and highly flammable liquid with a sweet smell, and is partially responsible for the aroma of gasoline. It is used primarily as a precursor to the manufacture of chemicals with more complex structure, such as ethylbenzene and cumene, of which billions of kilograms are produced annually. Although benzene is a major industrial chemical, it finds limited use in consumer items because of its toxicity. History Discovery The word "''benzene''" derives from "''gum benzoin''" (benzoin res ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Titration
Titration (also known as titrimetry and volumetric analysis) is a common laboratory method of quantitative chemical analysis to determine the concentration of an identified analyte (a substance to be analyzed). A reagent, termed the ''titrant'' or ''titrator'', is prepared as a standard solution of known concentration and volume. The titrant reacts with a solution of ''analyte'' (which may also be termed the ''titrand'') to determine the analyte's concentration. The volume of titrant that reacted with the analyte is termed the ''titration volume''. History and etymology The word "titration" descends from the French word ''titrer'' (1543), meaning the proportion of gold or silver in coins or in works of gold or silver; i.e., a measure of fineness or purity. ''Tiltre'' became ''titre'', which thus came to mean the "fineness of alloyed gold", and then the "concentration of a substance in a given sample". In 1828, the French chemist Joseph Louis Gay-Lussac first used ''titre'' as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boiling Point
The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. The boiling point of a liquid varies depending upon the surrounding environmental pressure. A liquid in a partial vacuum has a lower boiling point than when that liquid is at atmospheric pressure. A liquid at low pressure has a lower boiling point than when that liquid is at atmospheric pressure. Because of this, water boils at under standard pressure at sea level, but at at altitude. For a given pressure, different liquids will boiling, boil at different temperatures. The normal boiling point (also called the atmospheric boiling point or the atmospheric pressure boiling point) of a liquid is the special case in which the vapor pressure of the liquid equals the defined atmospheric pressure at sea level, one Atmosphere (unit), atmosphere. At that temperature, the vapor pressure of the liquid becomes suffici ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Melting Point
The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1 atmosphere or 100 kPa. When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point. Because of the ability of substances to supercool, the freezing point can easily appear to be below its actual value. When the "characteristic freezing point" of a substance is determined, in fact, the actual methodology is almost always "the principle of observing the disappearance rather than the formation of ice, that is, the melting point." Examples For most substances, melting and freezing points are approximately equal. For example, the melting point ''and'' freezing point of mercury is . How ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crystal
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macroscopic single crystals are usually identifiable by their geometrical shape, consisting of flat faces with specific, characteristic orientations. The scientific study of crystals and crystal formation is known as crystallography. The process of crystal formation via mechanisms of crystal growth is called crystallization or solidification. The word ''crystal'' derives from the Ancient Greek word (), meaning both "ice" and "rock crystal", from (), "icy cold, frost". Examples of large crystals include snowflakes, diamonds, and table salt. Most inorganic solids are not crystals but polycrystals, i.e. many microscopic crystals fused together into a single solid. Polycrystals include most metals, rocks, ceramics, and ice. A third category of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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