organic+chemist

m; -s, -, Organikerin f; -, -nen organic chemist

* * *

m(f) CHEM organic chemist

* * *

Organiker m; -s, -, Organikerin f; -, -nen organic chemist

SUBJECT AREA: Chemical technology, Synthetic materials, Textiles

[br]

[br]

[br]

After graduating in chemistry, Carothers embarked on academic research at several universities, finally at Harvard University. His earliest published papers, from 1923, heralded the brilliance and originality of his later work. In 1928, Du Pont de Nemours persuaded him to forsake the academic world to lead their new organic-chemistry group in a programme of fundamental research at their central laboratories at Wilmington, Delaware. The next nine years were extraordinarily productive, yielding important contributions to theoretical organic chemistry and the foundation of two branches of chemical industry, namely the production of synthetic rubber and of wholly synthetic fibres.

Carothers began work on high molecular weight substances yielding fibres and introduced polymerization by condensation: polymerization by addition was already known. He developed a clear understanding of the relation between the repeating structural units in a large molecule and its physical chemical properties. In 1931, Carothers found that chloroprene could be polymerized much faster than isoprene, the monomer in natural rubber. This process yielded polychloroprene or neoprene, a synthetic rubber with improved properties. Manufacture began the following year, and the material has continued to be used for speciality rubbers.

There followed many publications announcing new condensations polymers. On 2 January 1935, he obtained a patent for the formation of new polyamides, including one from adipic acid and hexamethylenediamene. After four years of development work, which cost Du Pont some $27 million, this new polyamide, or nylon, reached the stage of commercial production, beginning on 23 October 1938. Nylon stockings appeared the following year and 64 million were sold during the first twelve months. However, Carothers saw none of this spectacular success: he had died by his own hand in 1937, after a long history of gradually intensifying depression.

[br]

SUBJECT AREA: Chemical technology, Synthetic materials

[br]

[br]

[br]

Staudinger studied chemistry at the universities of Halle, Darmstadt and Munich, originally as a preparation for botanical studies, but chemistry claimed his full attention. He followed an academic career, with professorships at Karlsruhe in 1908, Zurich in 1912 and Freiberg from 1926 until his retirement in 1951. Staudinger began his work as an organic chemist by following well-established lines of research, but from 1920 he struck out in a new direction. Until that time, rubber and other apparently non-crystalline materials with high molecular weight were supposed to consist of a disordered collection of small molecules. Staudinger investigated the structure of rubber and realized that it was made up of very large molecules with many basic groups of atoms held together by normal chemical bonds. Substances formed in this way are known as "polymers". Staudinger's views first met with opposition, but he developed methods of determining the molecular weights of these "high polymers". Finally, the introduction of X-ray crystallographic investigation of chemical structure confirmed his views. This discovery has proved to be the basis of a new branch of chemistry with momentous consequences for industry. From it stemmed the synthetic rubber, plastics, fibres, adhesives and other industries, with all their multifarious applications in everyday life. The Staudinger equation, linking viscosity with molecular weight, is still widely used, albeit with some reservations, in the polymer industry.

During the 1930s, Staudinger turned his attention to biopolymers and foresaw the discovery some twenty years later that these macromolecules were the building blocks of life. In 1953 he belatedly received the Nobel Prize in Chemistry.

[br]

SUBJECT AREA: Agricultural and food technology, Chemical technology

[br]

[br]

[br]

Sustained by the family tanning business in Dole, near the Swiss border, Pasteur's school career was undistinguished, sufficing to gain him entry into the teacher-training college in Paris, the Ecole Normale, There the chemical lectures by the great organic chemist J.B.A.Dumas (1800–84) fired Pasteur's enthusiasm for chemistry which never left him. Pasteur's first research, carried out at the Ecole, was into tartaric acid and resulted in the discovery of its two optically active forms resulting from dissymmetrical forms of their molecules. This led to the development of stereochemistry. Next, an interest in alcoholic fermentation, first as Professor of Chemistry at Lille University in 1854 and then back at the Ecole from 1857, led him to deny the possibility of spontaneous generation of animal life. Doubt had previously been cast on this, but it was Pasteur's classic research that finally established that the putrefaction of broth or the fermentation of sugar could not occur spontaneously in sterile conditions, and could only be caused by airborne micro-organisms. As a result, he introduced pasteurization or brief, moderate heating to kill pathogens in milk, wine and other foods. The suppuration of wounds was regarded as a similar process, leading Lister to apply Pasteur's principles to revolutionize surgery. In 1860, Pasteur himself decided to turn to medical research. His first study again had important industrial implications, for the silk industry was badly affected by diseases of the silkworm. After prolonged and careful investigation, Pasteur found ways of dealing with the two main infections. In 1868, however, he had a stroke, which prevented him from active carrying out experimentation and restricted him to directing research, which actually was more congenial to him. Success with disease in larger animals came slowly. In 1879 he observed that a chicken treated with a weakened culture of chicken-cholera bacillus would not develop symptoms of the disease when treated with an active culture. He compared this result with Jenner's vaccination against smallpox and decided to search for a vaccine against the cattle disease anthrax. In May 1881 he staged a demonstration which clearly showed the success of his new vaccine. Pasteur's next success, finding a vaccine which could protect against and treat rabies, made him world famous, especially after a person was cured in 1885. In recognition of his work, the Pasteur Institute was set up in Paris by public subscription and opened in 1888. Pasteur's genius transcended the boundaries between science, medicine and technology, and his achievements have had significant consequences for all three fields.

[br]

SUBJECT AREA: Chemical technology

[br]

[br]

[br]

The son of an architect, Hofmann began studying law and languages but was increasingly drawn to chemistry, attracted by Liebig's teaching at Giessen. In 1841 Hofmann took his doctorate with a study of coal tar. He became Privatdozent at Bonn University in 1845, but later that year he was persuaded to take up the post of first Director of the Royal College of Chemistry in London, after tenure was guaranteed as a result of Prince Albert's influence. He remained there for twenty years until he was offered professorships in chemistry at Bonn and Berlin. He accepted the latter. Hofmann continued the method of teaching chemistry, based on laboratory instruction, developed by Liebig at Giessen, and extended it to England and Berlin. A steady stream of well-trained chemists issued forth from Hofmann's tuition, concerning themselves especially with experimental organic chemistry and the industrial applications of chemistry. In 1848 one of his students, C.B. Mansfield, devised the method of fractional distillation of coal tar, to separate pure benzene, xylene and toluene, thus laying the foundations of the coal-tar industry. In 1856 another student, W.H. Perkin, prepared the first synthetic dyestuff, aniline purple, heralding the great dyestuffs industry, in which several other of his students distinguished themselves. Although keenly interested in the chemistry of dyestuffs, Hofmann did not pursue their large-scale preparation, but he stressed the importance of scientific research for success on a commercial scale. Hofmann's stimulus in this direction flagged after his return to Germany, and this was a factor in the failure of British industry to follow up their initial advantage and allow it to pass to Germany. In 1862 Hofmann prepared a dye from a derivative of triphenylmethane, which he called rosaniline. From this he derived a series of beautiful colours, ranging from blue to violet, which he patented as "Hofmann's violets" the following year.

[br]

Organiker m; -s, -, Organikerin f; -, -nen organic chemist

organic compound.

* * *

= organic compound

Ex. The chemist, struggling with the synthesis of an organic compound, has all the chemical literature before him in his laboratory.

* * *

chemical.

1 Chemistry.

2 chemistry, chemistry course.

* * *

► nombre femenino

1 chemistry

* * *

* * *

SF chemistry

* * *

femenino chemistry

* * *

= chemistry.

Ex. Thus we all agree that one component of a building is a roof (and not vice versa!), and that chemistry is a branch of science.

----

* desde el punto de vista de la química = chemically.

* información sobre química = chemical information.

* química analítica = analytical chemistry.

* química inorgánica = inorganic chemistry.

* química orgánica = organic chemistry.

* química para la radiación = radiation chemistry.

* * *

femenino chemistry

* * *

* * *

(ciencia) chemistry

ese vino es pura química that wine is full of additives and chemicals

* * *

* * *

química nf

1. [ciencia] chemistry;

un licenciado en química(s) a chemistry graduate

química física physical chemistry;

química industrial industrial chemistry;

química inorgánica inorganic chemistry;

química orgánica organic chemistry

2. [sustancias artificiales] chemicals;

es pura química it's full of chemicals

3. Fam [atracción, entendimiento] chemistry;

no hay química entre los dos políticos there's no chemistry between the two politicians

4. ver químico

* * *

f chemistry

I adj chemical;

productos químicos chemicals

II m, química f chemist

* * *

química nf

: chemistry

* * *

química n chemistry

► verbo pronominal

1 (hacer frente) to face (a/con, -), confront (a/con, -)

■ tuvo que enfrentarse con los sindicatos he had to confront the unions

2 DEPORTE to meet (a/con, -)

3 (pelearse) to have an argument (a, with), fall out (a, with); (chocar) to clash (a/con, with)

* * *

1) (=pelear) [personas] to have a confrontation; [equipos] to face each other

2)

a) [+ persona] to confront

b) [+ problema, dificultad] to face (up to), confront

* * *

(v.) = struggle, tackle, come to + terms with, engage, come + face to face

Ex. The chemist, struggling with the synthesis of an organic compound, has all the chemical literature before him in his laboratory.

Ex. Chapter 2 tackles books, pamphlets and printed sheets, and chapter 3 is dedicated to cartographic materials.

Ex. Much of the conventional wisdom of librarianship is going to have to undergo what is so aptly described as an 'agonizing reappraisal' before we can come to terms with the new information age.

Ex. Australian destroyers engaged the Japanese shore guns and the mine sweepers carried out their task successfully, but not without loss.

Ex. If they come face to face in a fight to death, is it really that hard to imagine who would win?.

* * *

* * *

* * *

vpr

1. [afrontar]

nos enfrentamos a una grave crisis we are facing a serious crisis;

enfrentarse a los hechos to face the facts;

se enfrentó a su enfermedad con valor she faced up to her illness bravely

2. [en contienda] [dos bandos] to meet, to clash;

los dos equipos se enfrentarán por el campeonato the two teams will play each other for the championship;

enfrentarse a o [m5] con alguien to confront sb;

nos enfrentamos al enemigo we confronted the enemy;

los manifestantes se enfrentaron con la policía the demonstrators clashed with the police;

a Brasil le toca enfrentarse con Suecia Brazil has been drawn against Sweden

3. [discutir] to clash

* * *

1 DEP meet

enfrentarse con alguien confront s.o.

enfrentarse a algo face (up to) sth

* * *

vr

enfrentarse con : to clash with

enfrentarse a : to face up to

* * *

enfrentarse vb

1. (hacer frente) to face

2. (jugar) to play

3. (pelearse) to argue

► verbo pronominal

1 (físicamente) to make an effort, exert oneself; (moralmente) to try hard, strive

■ se esfuerza en ser educado he tries hard to be polite

■ debes esforzarte si quieres aprobar you'll have to work hard if you want to pass

■ se ha esforzado para llegar a la cumbre she has striven to get to the top

* * *

* * *

VPR to exert o.s., make an effort

* * *

= put forth + effort, put forth + energy, strive, strain, labour [labor, -USA], toil, struggle, work + hard, slave away, try + hard.

Ex. Because of this human characteristic of dislike of work, most people must be coerced, controlled, directed, threatened with punishment to get them to put forth adequate effort.

Ex. The goal may be of little value or of high scientific or cultural significance, but energy is put forth to accomplish a task.

Ex. The abstractor must resist the temptation to use long sentences in striving to avoid repetition.

Ex. His small foreign-made car strained with the added burden of an interior packed to capacity with personal belongings and a heavily laden U-Haul trailor attached to the rear.

Ex. So we see many wits and ingenuities lying scattered up and down the world, whereof some are now labouring to do what is already done and puzzling themselves to reinvent what is already invented.

Ex. His novels reflect the story of the spirit of man, undaunted and ceaselessly toiling and achieving ever higher levels of culture.

Ex. The chemist, struggling with the synthesis of an organic compound, has all the chemical literature before him in his laboratory.

Ex. Not only are the standards written, but there is a body called the Peer Council which works very hard at enforcing the standards.

Ex. Anyone who's spoken to me recently is probably aware that on most nights I'm up slaving away to the wee hours of the morning on my project.

Ex. Over the years the profession has tried hard to ignore the steady stream of library school closings.

----

* esforzarse al máximo = do + Posesivo + utmost, stretch + Reflexivo, stretch + Nombre + to the limit, give + Posesivo + utmost, lean over + backwards, work + hard, give + Posesivo + best.

* esforzarse por = endeavour [endeavor, -USA], try + Posesivo + best, go out of + Posesivo + way to + Infinitivo, do + Posesivo + best, exert + effort, try + Posesivo + heart out, give + Posesivo + best, take + (great) pains to.

* esforzarse por conseguir = strive for, work toward(s).

* esforzarse por lograr = strive for.

* * *

* * *

* * *

vpr

to make an effort;

tienes que esforzarte más si quieres aprobar you'll have to make more of an effort if you want to pass;

nos esforzamos, pero fue imposible ganarlos we tried very hard, but they were impossible to beat;

no te esfuerces, no puede oírte don't bother (shouting), she can't hear you;

se esforzaron enormemente en la tarea they put a huge amount of effort into the task;

esforzarse en o [m5] por hacer algo to make an effort to do sth;

me esforcé por ayudarlos I made a real effort o did my best to help them;

nos hemos esforzado mucho por ti we've made a real effort for you, we've really put ourselves out for you;

se esforzó en contener las lágrimas she tried hard to hold back the tears

* * *

v/r make an effort, try hard

* * *

vr

: to make an effort

* * *

esforzarse vb to try hard [pt. & pp. tried] / to work hard

se esforzó mucho he tried very hard / he worked very hard

to have a hard time.

* * *

(económicos) to be hard up 2 (dificultades) to be in a tight spot

* * *

(v.) = struggle, pass through + adversity, have + a thin time, be under strain, bear + hardship, be hard pressed, feel + the pinch, have + a hard time, the wolves + be + at the door, have + a tough time

Ex. The chemist, struggling with the synthesis of an organic compound, has all the chemical literature before him in his laboratory.

Ex. The personnel officer could see that the director was passing through adversity.

Ex. But the week by week publication of details of companies' accounts in the Bookseller cannot but show that many publishing houses have been having a very thin time indeed.

Ex. Sources of domestic supply of periodicals in the socialist countries are also under strain or have collapsed.

Ex. So we see extraordinary hardships cheerfully borne (indeed, apparently enjoyed) by zealous mountaineers, earnest single-handed yachtsmen floating round the world, and all-weather fishing-hobbyists sit patiently at the side of, and sometimes in, rivers, undeterred by the paucity of their catches.

Ex. Patent lawyers would be hard pressed if they had to operate without abstracts to the millions upon millions of patents issued for centuries all around the world.

Ex. Not unlike many municipalities in these inflationary times, Earnscliffe is feeling the pinch of a severely high general property tax -- i.e., the tax on real estate and personal property, both tangible and intangible.

Ex. Scholars are going to have a hard time finding that reference.

Ex. Yes, I know it's late, but there has been 'trouble at mill' -- the wolves have been at the doors, and the natives are nervous.

Ex. He had a tough time lugging his lumpy, oversized travelbag onto the plane and stuffing it in the overhead bin.

* * *

to be having troubles, to go through a lot of trouble, to be having a lot of trouble, to go through difficulties.

* * *

(v.) = struggle, be under strain, bear + hardship, have + a difficult time, experience + difficult times, pass through + difficult times, face + difficult times

Ex. The chemist, struggling with the synthesis of an organic compound, has all the chemical literature before him in his laboratory.

Ex. Sources of domestic supply of periodicals in the socialist countries are also under strain or have collapsed.

Ex. So we see extraordinary hardships cheerfully borne (indeed, apparently enjoyed) by zealous mountaineers, earnest single-handed yachtsmen floating round the world, and all-weather fishing-hobbyists sit patiently at the side of, and sometimes in, rivers, undeterred by the paucity of their catches.

Ex. Videotext services have had a notoriously difficult time becoming accepted in the US marketplace.

Ex. Consumer publishing is experiencing difficult times and there are specific developments which are influencing the market for children's books.

Ex. The author discusses the history of and services offered by the Folger Shakespeare Library which has passed through difficult times and emerged with a new building and a new personality.

Ex. This may be a reason why the publishing industry is facing such difficult times.

* * *

(v.) = have + before

Ex. The chemist, struggling with the synthesis of an organic compound, has all the chemical literature before him in his laboratory.

* * *

to have difficulty, to find difficulty.

* * *

(v.) = struggle, experience + difficulty, be hard pressed

Ex. The chemist, struggling with the synthesis of an organic compound, has all the chemical literature before him in his laboratory.

Ex. Initially, the library staff experienced difficulties in adjusting to the new service.

Ex. Patent lawyers would be hard pressed if they had to operate without abstracts to the millions upon millions of patents issued for centuries all around the world.

* * *

SUBJECT AREA: Chemical technology

[br]

[br]

[br]

Bunsen's father was Librarian and Professor of Linguistics at Göttingen University and Bunsen himself studied chemistry there. Obtaining his doctorate at the age of only 19, he travelled widely, meeting some of the leading chemists of the day and visiting many engineering works. On his return he held various academic posts, finally as Professor of Chemistry at Heidelberg in 1852, a post he held until his retirement in 1889.

During 1837–41 Bunsen studied a series of compounds shown to contain the cacodyl (CH3)2As-group or radical. The elucidation of the structure of these compounds gave support to the radical theory in organic chemistry and earned him fame, but it also cost him the sight of an eye and other ill effects resulting from these dangerous and evil-smelling substances. With the chemist Gustav Robert Kirchhoff (1824–87), Bunsen pioneered the use of spectroscopy in chemical analysis from 1859, and with its aid he discovered the elements caesium and rubidium. He developed the Bunsen cell, a zinc-carbon primary cell, with which he isolated a number of alkali and other metals by electrodeposition from solution or electrolysis of fused chlorides.

Bunsen's main work was in chemical analysis, in the course of which he devised some important laboratory equipment, such as a filter pump. The celebrated Bunsen gas burner was probably devised by his technician Peter Desdega. During 1838–44 Bunsen applied his methods of gas analysis to the study of the gases produced by blast furnaces for the production of cast iron. He demonstrated that no less than 80 per cent of the heat was lost during smelting, and that valuable gaseous by-products, such as ammonia, were also lost. Lyon Playfair in England was working along similar lines, and in 1848 the two men issued a paper, "On the gases evolved from iron furnaces", to draw attention to these drawbacks.

[br]

SUBJECT AREA: Chemical technology

[br]

[br]

[br]

Haber's father was a manufacturer of dyestuffs, so he studied organic chemistry at Berlin and Heidelberg universities to equip him to enter his father's firm. But his interest turned to physical chemistry and remained there throughout his life. He became Assistant at the Technische Hochschule in Karlsruhe in 1894; his first work there was on pyrolysis and electrochemistry, and he published his Grundrisse der technischen Electrochemie in 1898. Haber became famous for thorough and illuminating theoretical studies in areas of growing practical importance. He rose through the academic ranks and was appointed a full professor in 1906. In 1912 he was also appointed Director of the Institute of Physical Chemistry and Electrochemistry at Dahlem, outside Berlin.

Early in the twentieth century Haber invented a process for the synthesis of ammonia. The English chemist and physicist Sir William Crookes (1832–1919) had warned of the danger of mass hunger because the deposits of Chilean nitrate were becoming exhausted and nitrogenous fertilizers would not suffice for the world's growing population. A solution lay in the use of the nitrogen in the air, and the efforts of chemists centred on ways of converting it to usable nitrate. Haber was aware of contemporary work on the fixation of nitrogen by the cyanamide and arc processes, but in 1904 he turned to the study of ammonia formation from its elements, nitrogen and hydrogen. During 1907–9 Haber found that the yield of ammonia reached an industrially viable level if the reaction took place under a pressure of 150–200 atmospheres and a temperature of 600°C (1,112° F) in the presence of a suitable catalyst—first osmium, later uranium. He devised an apparatus in which a mixture of the gases was pumped through a converter, in which the ammonia formed was withdrawn while the unchanged gases were recirculated. By 1913, Haber's collaborator, Carl Bosch had succeeded in raising this laboratory process to the industrial scale. It was the first successful high-pressure industrial chemical process, and solved the nitrogen problem. The outbreak of the First World War directed the work of the institute in Dahlem to military purposes, and Haber was placed in charge of chemical warfare. In this capacity, he developed poisonous gases as well as the means of defence against them, such as gas masks. The synthetic-ammonia process was diverted to produce nitric acid for explosives. The great benefits and achievement of the Haber-Bosch process were recognized by the award in 1919 of the Nobel Prize in Chemistry, but on account of Haber's association with chemical warfare, British, French and American scientists denounced the award; this only added to the sense of bitterness he already felt at his country's defeat in the war. He concentrated on the theoretical studies for which he was renowned, in particular on pyrolysis and autoxidation, and both the Karlsruhe and the Dahlem laboratories became international centres for discussion and research in physical chemistry.

With the Nazi takeover in 1933, Haber found that, as a Jew, he was relegated to second-class status. He did not see why he should appoint staff on account of their grandmothers instead of their ability, so he resigned his posts and went into exile. For some months he accepted hospitality in Cambridge, but he was on his way to a new post in what is now Israel when he died suddenly in Basel, Switzerland.

[br]

SUBJECT AREA: Agricultural and food technology, Chemical technology

[br]

[br]

[br]

As the son of a pharmacist, Lei big early acquired an interest in chemistry. In 1822 he pursued his chemical studies in Paris under Joseph Louis Gay-Lussac (1778–1850), one of the leading chemists of the time. Three years later he became Professor of Chemistry in the small university of Giessen, near Frankfurt, where he remained for over thirty years. It was there that he established his celebrated laboratory for training in practical chemistry. The laboratory itself and the instruction given by Liebig were a model for the training of chemists throughout Europe and a steady stream of well-qualified chemists issued forth from Giessen. It was the supply of well-trained chemists that proved to be the basis for Germany's later success in industrial chemistry. The university now bears Liebig's name, and the laboratory has been preserved as a museum in the same state that it was in after the extensions of 1839. Liebig's many and important researches into chemical theory and organic chemistry lie outside the scope of this Dictionary. From 1840 he turned to the chemistry of living things. In agriculture, he stressed the importance of fertilizers containing potassium and phosphorus, although he underrated the role of nitrogen. Liebig thereby exerted a powerful influence on the movement to provide agriculture with a scientific basis.

[br]

•

Writing this book proved a tougher task than I had bargained for (or expected, or anticipated).

•

Alkaloids are complex organic amines, so the chemist can count (or rely) on their ability to form salts with acids...