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Johann Heinrich Ziegler
Johann Heinrich Ziegler (6 December 1857 in Winterthur – 30 January 1936 in Zurich) was a Swiss dye chemist and natural philosopher. Life Johann Heinrich Ziegler was born as the son of the manufacturer Emil Ziegler. He studied chemistry and received his doctorate in 1883 in Erlangen, with his dissertation ''Ueber Derivate des Beta-Naphthylamins'' (''on derivatives of beta-naphthylamine''), under the later Nobel Prize winner Emil Fischer. (retrieved via de Gruyter Online). In 1884, Ziegler developed the yellow azo dye tartrazine in the laboratories of the Bindschedler'sche Fabrik fürchemische Industrie in Basel ( CIBA). This was patented and produced in Germany by BASF in 1885 (DRP 34294). The process was first presented in 1887 in ''Chemische Berichte'', the journal of the German Chemical Society. Although the structure proposed by Ziegler was not confirmed, he was able to develop an alternative synthesis of tartrazine based on the idea that a hydrazone is the tautomeric form of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winterthur
Winterthur (; ) is a city in the canton of Zurich in northern Switzerland. With over 120,000 residents, it is the country's List of cities in Switzerland, sixth-largest city by population, as well as its ninth-largest agglomeration with about 140,000 inhabitants. Located about northeast of Zurich, Winterthur is a service and high-tech industrial satellite city within Zurich Metropolitan Area. The official language of Winterthur is German,The official language in any municipality in German-speaking Switzerland is always German. In this context, the term 'German' is used as an umbrella term for any variety of German. So, according to law, you are allowed to communicate with the authorities by using any kind of German, in written or oral form. However, the authorities will always use Swiss Standard German (aka the Swiss variety of Standard German) in documents, or any written form. And orally, it is either ''Hochdeutsch'' (i.e., Swiss Standard German or what the particular speaker ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightfast
Lightfastness is a property of a colourant such as dye or pigment that describes its resistance to fading when exposed to light. Dyes and pigments are used for example for dyeing of fabrics, plastics or other materials and manufacturing paints or printing inks. The bleaching of the color is caused by the impact of ultraviolet radiation in the chemical structure of the molecules giving the color of the subject. The part of a molecule responsible for its color is called the chromophore. Light encountering a painted surface can either alter or break the chemical bonds of the pigment, causing the colors to bleach or change in a process known as photodegradation. Materials that resist this effect are said to be lightfast. The electromagnetic spectrum of the sun contains wavelengths from gamma waves to radio waves. The high energy of ultraviolet radiation in particular accelerates the fading of the dye. The photon energy of UVA-radiation which is not absorbed by atmospheric ozone ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1936 Deaths
Events January–February * January 20 – The Prince of Wales succeeds to the throne of the United Kingdom as King Edward VIII, following the death of his father, George V, at Sandringham House. * January 28 – Death and state funeral of George V, State funeral of George V of the United Kingdom. After a procession through London, he is buried at St George's Chapel, Windsor Castle. * February 4 – Radium E (bismuth-210) becomes the first radioactive element to be made synthetically. * February 6 – The 1936 Winter Olympics, IV Olympic Winter Games open in Garmisch-Partenkirchen, Germany. * February 10–February 19, 19 – Second Italo-Ethiopian War: Battle of Amba Aradam – Italian forces gain a decisive tactical victory, effectively neutralizing the army of the Ethiopian Empire. * February 16 – 1936 Spanish general election: The left-wing Popular Front (Spain), Popular Front coalition takes a majority. * February 26 – February 26 Incident (二・二六事件, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1857 Births
Events January–March * January 1 – The biggest Estonian newspaper, ''Postimees'', is established by Johann Voldemar Jannsen. * January 7 – The partly French-owned London General Omnibus Company begins operating. * January 9 – The 7.9 1857 Fort Tejon earthquake, Fort Tejon earthquake shakes Central California, Central and Southern California, with a maximum Mercalli intensity scale, Mercalli intensity of IX (''Violent''). * January 24 – The University of Calcutta is established in Kolkata, Calcutta, as the first multidisciplinary modern university in South Asia. The University of Bombay is also established in Mumbai, Bombay, British India, this year. * February 3 – The National Deaf Mute College (later renamed Gallaudet University) is established in Washington, D.C., becoming the first school for the advanced education of the deaf. * February 5 – The Federal Constitution of the United Mexican States of 1857, Federal Constitution of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naturforschende Gesellschaft In Zürich
The Society of Natural Sciences in Zurich (''Naturforschende Gesellschaft in Zürich'') is a society founded in 1746 for the promotion of natural sciences. It was founded by Johannes Gessner and other citizens in Zurich as the ''Physicalische Societät'' and is one of the oldest scientific societies in both Switzerland and the German-speaking world. As of 2025, there were around 475 members, and the president is Fritz Gassmann. Within the Swiss Academy of Natural Sciences, the NGZH is a member organisation of the Natural Sciences Platform. History In the Age of Enlightenment, people devoted themselves to the then flourishing natural sciences, i.e., in addition to physics, also mathematics, technology, agriculture, medicine, pharmacy, and especially natural history (which included descriptive natural sciences such as zoology, botany, meteorology, geology, geography, and astronomy). Zurich citizens tended to expand and complete their academic studies at foreign universities. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilhelm Ostwald
Wilhelm Friedrich Ostwald (; – 4 April 1932) was a Latvian chemist and philosopher. Ostwald is credited with being one of the founders of the field of physical chemistry, with Jacobus Henricus van 't Hoff, Walther Nernst and Svante Arrhenius. He received the Nobel Prize in Chemistry in 1909 for his scientific contributions to the fields of catalysis, chemical equilibria and reaction velocities. Following his 1906 retirement from academic life, Ostwald became much involved in philosophy, art, and politics. He made significant contributions to each of these fields. He has been described as a polymath. Early life and education Ostwald was born ethnically Baltic German in Riga, Russian Empire (now Latvia) to master-cooper Gottfried Wilhelm Ostwald and Elisabeth Leuckel. He was the middle child of three, born after Eugen and before Gottfried. Ostwald developed an interest in science as a child and conducted experiments at his home, particularly related to fireworks and photogr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Color Theory
Color theory, or more specifically traditional color theory, is a historical body of knowledge describing the behavior of colors, namely in color mixing, color contrast effects, color harmony, color schemes and color symbolism. Modern color theory is generally referred to as color science. While there is no clear distinction in scope, traditional color theory tends to be more subjective and have artistic applications, while color science tends to be more objective and have functional applications, such as in chemistry, astronomy or color reproduction. Color theory dates back at least as far as Aristotle's treatise ''On Colors'' and Bharata_(sage), Bharata's Natya_Shastra, Nāṭya Shāstra. A formalization of "color theory" began in the 18th century, initially within a partisan controversy over Isaac Newton's theory of color (''Opticks'', 1704) and the nature of primary colors. By the end of the 19th century, a schism had formed between traditional color theory and color science ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theory Of Relativity
The theory of relativity usually encompasses two interrelated physics theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively. Special relativity applies to all physical phenomena in the absence of gravity. General relativity explains the law of gravitation and its relation to the forces of nature. It applies to the cosmological and astrophysical realm, including astronomy. The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It introduced concepts including 4-dimensional spacetime as a unified entity of space and time, relativity of simultaneity, kinematic and gravitational time dilation, and length contraction. In the field of physics, relativity improved the science of elementary particles and their fundamental interactions, along with ushering in the nuclear age. With relativity, cosmolog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albert Einstein
Albert Einstein (14 March 187918 April 1955) was a German-born theoretical physicist who is best known for developing the theory of relativity. Einstein also made important contributions to quantum mechanics. His mass–energy equivalence formula , which arises from special relativity, has been called "the world's most famous equation". He received the 1921 Nobel Prize in Physics for . Born in the German Empire, Einstein moved to Switzerland in 1895, forsaking his German citizenship (as a subject of the Kingdom of Württemberg) the following year. In 1897, at the age of seventeen, he enrolled in the mathematics and physics teaching diploma program at the Swiss ETH Zurich, federal polytechnic school in Zurich, graduating in 1900. He acquired Swiss citizenship a year later, which he kept for the rest of his life, and afterwards secured a permanent position at the Swiss Patent Office in Bern. In 1905, he submitted a successful PhD dissertation to the University of Zurich. In 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plagiarism
Plagiarism is the representation of another person's language, thoughts, ideas, or expressions as one's own original work.From the 1995 ''Random House Dictionary of the English Language, Random House Compact Unabridged Dictionary'': use or close imitation of the language and thoughts of another author and the representation of them as one's own original work qtd. in From the Oxford English Dictionary: The action or practice of taking someone else's work, idea, etc., and passing it off as one's own; literary theft. Although precise definitions vary depending on the institution, in many countries and cultures plagiarism is considered a violation of academic integrity and journalistic ethics, as well as of social norms around learning, teaching, research, fairness, respect, and responsibility. As such, a person or Legal Entity, entity that is determined to have committed plagiarism is often subject to various punishments or sanctions, such as Suspension (punishment), suspension, Expul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Höngg
Höngg is a quarter in district 10 in Zürich. It was formerly a municipality of its own, having been incorporated into Zürich in 1934. The quarter has a population of 21,186, distributed across an area of 6.98 km2. Höngg is renowned for its funfairs, such as the Wümmetfest and the Räbeliechtli Umzug. The Protestant church Alte Kirche Höngg is the main church of Höngg. Sport SV Höngg is the quarter's football team. Werdinsel Werdinsel, also known as Limmatauen Werdhölzli, is an island and protected area in the Limmat The Limmat is a river in Switzerland. The river commences at the outfall of Lake Zurich, in the southern part of the city of Zurich. From Zurich it flows in a northwesterly direction, continuing a further 35 km until it reaches the river A ..., to the west of the Europabrücke. Gallery External links A drone flying north over the Reformed church, Meierhofplatz, and looking east down Am Wasser and the Limmat [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Food Coloring
Food coloring, color additive or colorant is any dye, pigment, or substance that imparts color when it is added to food or beverages. Colorants can be supplied as liquids, powders, gels, or pastes. Food coloring is commonly used in commercial products and in domestic cooking. Food colorants are also used in various non-food applications, including cosmetics, pharmaceuticals, home craft projects, and medical devices. Some colorings may be natural, such as with carotenoids and anthocyanins extracted from plants or cochineal from insects, or may be synthesized, such as tartrazine yellow. In the manufacturing of foods, beverages and cosmetics, the safety of colorants is under constant scientific review and certification by national regulatory agencies, such as the European Food Safety Authority (EFSA) and US Food and Drug Administration (FDA), and by international reviewers, such as the Joint FAO/WHO Expert Committee on Food Additives. Purpose of food coloring People asso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
