|
Karl Albert Hasselbalch
Karl Albert Hasselbalch (; 1 November 1874 – 19 September 1962) was a Danish physician and chemist known for his work on the Henderson–Hasselbalch equation. Early life and education Hasselbalch was born in Åstrup, near Hjørring, Denmark on 1 November 1874. His parents were landowner and lawyer Hans Peter Jansen Hasselbalch (1843–1916) and Hedevig Alberta Rebekka Spärck (1845–76). In 1879, his father remarried to Wilhelmine Marie Koppel (1858–1950=- Hasselbalch received his medical degree in 1898 and his doctorate in 1899 for his thesis on the respiratory metabolism in the chicken embryo. Career Hasselbalch was a pioneer in the use of pH measurement in medicine (with Christian Bohr, father of Niels Bohr), and he described how the affinity of blood for oxygen was dependent on the concentration of carbon dioxide. He was also first to determine the pH of blood. In 1916, he converted the 1908 equation of Lawrence Joseph Henderson to logarithmic form, which is now ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henderson–Hasselbalch Equation
In chemistry and biochemistry, the pH of weakly acidic Solution (chemistry), chemical solutions can be estimated using the Henderson-Hasselbach Equation: \ce = \ceK_\ce + \log_ \left( \frac \right) The equation relates the pH of the weak acid to the numerical value of the acid dissociation constant, ''K''a, of the acid strength, acid, and the ratio of the concentrations of the acid and its Conjugate (acid-base theory), conjugate base. ''Acid-base Equilibrium Reaction'' \mathrm The Henderson-Hasselbalch equation is often used for estimating the pH of buffer solutions by approximating the actual concentration ratio as the ratio of the analytical concentrations of the acid and of a salt, MA. It is also useful for determining the volumes of the reagents needed before preparing buffer solutions, which prevents unncessary waste of chemical reagents that may need to be further neutralized by even more reagents before they are safe to expose. For example, the acid may be carbo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gustav Adolph Hagemann
Gustav Adolph Hagemann (16 May 1842 – 26 April 1916) was a Danish engineer and businessman. He was chief technical officer of the De Danske Sukkerfabrikker, Danish Sugar Factories from 1872 to 1897 and then served as chairman of the board until 1916. He owned several sugar plantations on Saint Croix in the Danish West Indies. Early life and education Hagemann was born on the Rodsteenseje estate at Odder in 1842, the son of Otto Waldemar Hagemann (1809–1890) and Sophie Marie Poulsen (1815–1901). His father owned the estate until 1857 when he returned to Holstein. Hagemann went to school in Aarhus before studying Applied Sciences at the Technical University of Denmark, College of Advanced Technology in Copenhagen from 1860 to 1865. Career Hagemann was employed by the Øresunds chemiske Fabriker, Øresund cryolite factory () in 1864. In 1865, when he had completed his exams, sent him to the US to oversee the deliveries of cryolite to the Pennsalt Historic District, Pennsylvan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Danish Chemists
Danish may refer to: * Something of, from, or related to the country of Denmark People * A Danish person, also called a "Dane", can be a national or citizen of Denmark (see Demographics of Denmark) * Culture of Denmark * Danish people or Danes, people with a Danish ancestral or ethnic identity * A member of the Danes, a Germanic tribe * Danish (name), a male given name and surname Language * Danish language, a North Germanic language used mostly in Denmark and Northern Germany * Danish tongue or Old Norse, the parent language of all North Germanic languages Food * Danish cuisine * Danish pastry, often simply called a "Danish" See also * Dane (other) * * Gdańsk * List of Danes * Languages of Denmark The Kingdom of Denmark has only one official language, Danish, the national language of the Danish people, but there are several minority languages spoken, namely Faroese, German, and Greenlandic. A large majority (about 86%) of Danes also ... {{disambigu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grønnessegaard
Grønnessegaard is a manor house and estate located just east of Hundested in Halsnæs Municipality, Denmark, some northwest of Copenhagen. The estate was established by Johan Frederik Classen in 1776. The two-storey main building is from 1859. History Johan Frederik Classen and his partner Just Fabritius had established the nearby Frederick's Works arms factory in 1756. The town of Frederiksværk had formed around the factory. Over the years Classen had also acquired the surrounding land from the crown. He established Arresødal in 1773. In 1776, he also merged the villages of Gryndese, Rorup and Fornerup into another manor named Grønnessegaard. The manors produced food for the workers at his factory and at the same time played an important role as a labour reserve. Johan Frederik Classen died in 1792. Det Classenske Fideicommis ceded Frederick's Works, Arresødal and Grønnessegaard to Prince Charles of Hesse-Kassel in return for the payment of 7,000 Danish rigsdaler to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hagen Hasselbalch
Hagen () is a city in the state of North Rhine-Westphalia, in western Germany, on the southeastern edge of the Ruhr area, 15 km south of Dortmund, where the rivers Lenne and Volme meet the Ruhr. In 2023, the population was 197,677. The city is home to the FernUniversität Hagen (University of Hagen), the only state-funded distance education university in Germany. Geography The largest extension of Hagen's municipal area is 17.1 km in a north-south direction and 15.5 km in a west-east direction. The city boundary of 89.7 km is made up of 3.3 km to Dortmund, 9 km to the district of Unna, 56.6 km to the Ennepe-Ruhr district and 20.8 km to the Märkisch district. The area of the city (160.36 km²) is roughly the size of the Principality of Liechtenstein. 42 per cent of Hagen's municipal area consists of forest. The four rivers in Hagen stretch over a length of 52.2 km: Ruhr 11.5 km, Lenne 13.1 km, Volme 21.3 km and Ennepe 6.3 km. The difference in altitude from the lowes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lawrence Joseph Henderson
Lawrence Joseph Henderson (June 3, 1878 – February 10, 1942) was an American physiologist, chemist, biologist, philosopher, and sociologist. He became one of the leading biochemists of the early 20th century. His work contributed to the Henderson–Hasselbalch equation, used to calculate pH as a measure of acidity. Early life Lawrence Henderson was born in Lynn, Massachusetts the son of a business man Joseph Henderson and his wife. He entered Harvard at the age of 16 in 1894. His father was a ship chandler whose principal business was located in nearby Salem, but who also conducted business in Saint Pierre and Miquelon, a French Overseas collectivity off the coast of Canada. Career Lawrence Henderson graduated from Harvard College in 1898 and from Harvard Medical School in 1902, receiving the M.D. (Medical Doctor) degree cum laude. Then followed two years in chemical research at the University of Strasbourg with advanced scientific training in Franz Hofmeister's physiolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hjørring
Hjørring () is a town on the island of Vendsyssel-Thy at the top of the Jutland peninsula in northern Denmark. It is the main town and the administrative seat of Hjørring Municipality in the North Jutland Region. The population is 25,908 (according to an official census carried on 1 January 2025).BY3: Population 1. January by urban areas, area and population density The Mobile Statbank from Statistics Denmark It is also one of Denmark's oldest towns, having celebrated its 750th anniversary as a market town in 1993. Hjørring is centrally located in a sparsely populated area and serves as an urban center for large parts of especially the western and central Vendsyssel. History Middle Ages Although archaeological discoveries show that the area ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon Dioxide
Carbon dioxide is a chemical compound with the chemical formula . It is made up of molecules that each have one carbon atom covalent bond, covalently double bonded to two oxygen atoms. It is found in a gas state at room temperature and at normally-encountered concentrations it is odorless. As the source of carbon in the carbon cycle, atmospheric is the primary carbon source for life on Earth. In the air, carbon dioxide is transparent to visible light but absorbs infrared, infrared radiation, acting as a greenhouse gas. Carbon dioxide is soluble in water and is found in groundwater, lakes, ice caps, and seawater. It is a trace gas Carbon dioxide in Earth's atmosphere, in Earth's atmosphere at 421 parts per million (ppm), or about 0.042% (as of May 2022) having risen from pre-industrial levels of 280 ppm or about 0.028%. Burning fossil fuels is the main cause of these increased concentrations, which are the primary cause of climate change.IPCC (2022Summary for pol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Niels Bohr
Niels Henrik David Bohr (, ; ; 7 October 1885 – 18 November 1962) was a Danish theoretical physicist who made foundational contributions to understanding atomic structure and old quantum theory, quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research. Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. Although the Bohr model has been supplanted by other models, its underlying principles remain valid. He conceived the principle of Complementarity (physics), complementarity: that items could be separately analysed in terms of contradictory properties, like behaving as a Wave–particle duality, wave or a stream of particles. The notion of complementarity dominated Bohr's thinking in both science and philoso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
