Which Joe gave his name to ‘sloppy joes’? We look at five interesting sandwiches and their lexical origins.
1A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
channel, medium, means, means of expression, agency, agent, instrument, mechanism, organ, apparatus, structure, machine, machineryView synonyms
- ‘Chemicals in the catalytic converter act as catalysts, changing the highly hazardous gas compounds to less harmful ones.’
- ‘The key tools will be new breeds of enzymes - protein catalysts that speed up chemical reactions in cells.’
- ‘Ionic liquids usefully form one of the phases because they don't mix with many organic solvents, but readily dissolve metals used as catalysts.’
- ‘Most converters use platinum or palladium metal catalysts that convert carbon monoxide and hydrocarbons to carbon dioxide and water vapor.’
- ‘In fact, zeolites are the main catalysts in petrochemical refineries today.’
- ‘Finally, a relatively small amount of rhenium is used to make catalysts for the petroleum industry.’
- ‘When temperature is increased, synthetic catalysts can become just as active as enzymes.’
- ‘Instead, we started to look further afield at copper-based catalysts that had been rejected during the initial ester hydrogenation testwork.’
- ‘These versatile molecules function as catalysts in the hydrogen peroxide bleaching process.’
- ‘Enzymes are the biological substance that act as catalysts and help complex reactions occur everywhere in life.’
- ‘Many alkyl halides, alcohols, or alkenes can be reacted with benzene in the presence of certain catalysts to give an alkyl benzene.’
- ‘Heterogeneous catalysts are materials that increase the rate of a reaction, but are not in the same phase as the reactants.’
- ‘He attempted to polymerize ethylene using catalysts at a much lower pressure than that used by the British process.’
- ‘The element is also used to make dyes, photographic film, specialized soaps, and catalysts.’
- ‘Some germanium is also used to make semiconductors, catalysts, and specialized glass for military weapon-sighting systems.’
- ‘Catalyst recovery is one of the most actively researched areas for cost-cutting in the chemical industry, as catalysts often contain rare and expensive metals.’
- ‘Silicone surfactants, and amine and tin catalysts, are also used.’
- ‘All of the platinum-group metals are good catalysts: they speed up the rate of certain chemical reactions.’
- ‘Solid oxide catalysts are commonly used for chemical and refinery operations.’
- ‘The one exception is that it is sometimes used as a catalyst in the petroleum industry.’
- 1.1 A person or thing that precipitates an event.‘the governor's speech acted as a catalyst for debate’
stimulus, stimulation, motivation, motivating force, fillip, encouragement, influence, muse, goad, spur, lift, boost, incentive, incitement, impulse, catalystView synonyms
- ‘I hope that it will be a catalyst for an ongoing debate and discussion in our field.’
- ‘This is the catalyst for a chain of events which threatens to destabilise the parliament.’
- ‘The event was to be used as a catalyst for change and to bring new hope to residents in rundown areas of the city.’
- ‘All three shocks have caused, or been a catalyst for, a serious downturn in western economies.’
- ‘It is amazing what acts as a catalyst to spur people on to do something about a situation.’
- ‘More importantly, it was about inspired individuals being the catalysts of effecting new possibilities.’
- ‘On the second issue, the crisis also served as a catalyst to the birth of a more responsible and braver press.’
- ‘The beach becomes the catalyst which encourages them to break society's rules.’
- ‘If there is any catalyst to get the team motivated for next season it will be this performance in the nationals.’
- ‘It will hopefully act as a catalyst for more formal public education in the future.’
- ‘The film's other characters are secondary, and often serve little purpose beyond acting as catalysts.’
- ‘Historical and meaningful events such as this often act as a catalyst for change.’
- ‘Events, individuals, circumstances and situations are catalysts for transformations in culture.’
- ‘It is the union of the latter two that provides the catalyst for the events that follow.’
- ‘There are many events however that serve as catalysts for the big historic shifts.’
- ‘The Parliamentary debate on this report was the actual catalyst which prompted the minister to resign.’
- ‘Though the film is around these two men, it is the women who play the catalyst to all the events and add momentum to the story.’
- ‘The primary catalysts that induced this growth were the end-user industries, communications, and computers, in particular.’
- ‘Public opinion polls often serve as catalysts for such debates.’
- ‘In Scotland, it has always been Catholic schools which have been the catalyst for this debate.’
Early 20th century: from catalysis, on the pattern of analyst.
We take a look at several popular, though confusing, punctuation marks.
From Afghanistan to Zimbabwe, discover surprising and intriguing language facts from around the globe.
The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.