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Synthesis and biosynthesis of sucrose[ edit ] The biosynthesis of sucrose proceeds via the precursors UDP-glucose and fructose 6-phosphatecatalyzed by the enzyme sucrosephosphate synthase. The energy for the reaction is gained by the cleavage of uridine diphosphate UDP. Sucrose is formed by plants and cyanobacteria but not by other organisms. Sucrose is found naturally in many food plants along with the monosaccharide fructose.
In many fruits, such as pineapple and apricotsucrose is the main sugar.
Sucrose - Wikipedia
In others, such as grapes and pearsfructose is the main sugar. Chemical synthesis[ edit ] Model of sucrose molecule Although sucrose is almost invariably isolated from natural sources, its chemical synthesis was first achieved in by Raymond Lemieux.
Seen from a human consumption perspective, honeybees are especially important because they accumulate sucrose and produce honeyan important foodstuff all over the world. The carbohydrates in honey itself primarily consists of fructose and glucose with trace amounts of sucrose only. This includes grapes, cherries, blueberries, blackberries, figs, pomegranates, tomatoes, avocados, lemons and limes.
Sucrose is a naturally occurring sugar, but with the advent of industrializationit has been increasingly refined and consumed in all kinds of processed foods. Production[ edit ] History of sucrose refinement[ edit ] Table sugar production in the 19th century. Sugar cane plantations upper image employed slave or indentured laborers. The picture shows workers harvesting cane, loading it on a boat for transport to the plant, while a European overseer watches in the lower right.
The lower image shows a sugar plant with two furnace chimneys.
Sugar plants and plantations were harsh, inhumane work. Sugar nips were required to break off pieces. History of sugar The production of table sugar has a long history. Some scholars claim Indians discovered how to crystallize sugar during the Gupta dynastyaround AD On their return journey, the Greek soldiers carried back some of the "honey-bearing reeds". Sugarcane remained a limited crop for over a millennium. Sugar was a rare commodity and traders of sugar became wealthy.
Venice, at the height of its financial power, was the chief sugar-distributing center of Europe. Only after the Crusades did it begin to rival honey as a sweetener in Europe. The Spanish began cultivating sugarcane in the West Indies in Cuba in The Portuguese first cultivated sugarcane in Brazil in Sugar remained a luxury in much of the world until the 18th century.
Only the wealthy could afford it. In the 18th century, the demand for table sugar boomed in Europe and by the 19th century it had become regarded as a human necessity. Suppliers marketed sugar in novel forms, such as solid cones, which required consumers to use a sugar nipa pliers-like tool, in order to break off pieces. The demand for cheaper table sugar drove, in part, colonization of tropical islands and nations where labor-intensive sugarcane plantations and table sugar manufacturing could thrive.
Growing sugar cane crop in hot humid climates, and producing table sugar in high temperature sugar mills was harsh, inhumane work.
The demand for cheap and docile labor for this work, in part, first drove slave trade from Africa in particular West Africafollowed by indentured labor trade from South Asia in particular India. The modern ethnic mix of many nations, settled in the last two centuries, has been influenced by table sugar.
The steam engine first powered a sugar mill in Jamaica inand, soon after, steam replaced direct firing as the source of process heat. Men and women made decisions in a similar manner which incorporated the physical attractiveness and likability of the viewed participants in their evaluation.
Sheena Iyengar and Raymond Fisman found, from having the participants fill out questionnaires, that what people said they wanted in an ideal mate did not match their subconscious preferences. Because parents with more diverse MHC profiles would be expected to produce offspring with stronger immune systemsdissimilar MHC may play a role in sexual selection.
A speed "date" lasting several minutes should be long enough for the MHC hypothesis to come into play, provided the participants are seated close enough together. One of each set was wearing pheromonesand the ones wearing pheromones received more matches.
Selectivity[ edit ] Studies of speed dating events generally show more selectivity among women than among men. This new study showed that when men were seated and the women rotated, the men were more selective. A structured way of running business networking events with the goal of making meeting potential business contacts easier and more productive. Some speed dating companies have now started offering free speed dating where the user does not pay unless they meet somebody they like.
Business speed dating has also been used in China as a way for business people to meet each other and to decide if they have similar business objectives and synergies. In popular culture[ edit ] Frasier. Frasier attends a speed date, describing it as "all the stress and humiliation of a blind date, times twelve. Mark goes speed dating but has little luck: Maybe she did tick! Maybe the data wasn't collated correctly!
Maybe she's my hanging chad! Miranda, the lawyer, pretends to be a stewardess at the event after telling her first few "dates" that she is a successful lawyer scares them off  Providence. Syd goes to a "speed dating" event.
Kim, estranged from her husband of 2 months, goes with her friend Sharon to a speed dating event. Reba's daughter, Cheyenne, convinces her mother to try speed-dating. Monk Goes to the Theater " Adrian Monk tries to talk to a suspect at a speed dating event. Daisy goes speed dating to take the soul of one of the men participating. Featured Rory 's friend Paris attempting speed dating after the death of her professor boyfriend. Geraldine Granger receives a ticket to a speed dating event for her 40th birthday.
Featured speed dating as one of the challenges faced by the "geeks". Yvonne Hemmingway persuades Honey Harman to go with her to a speed-dating event. Alice and Kit go to a speed dating event.
Shawn and Gus connect supposed "alien abductions" to a speed-dating event at a local bar, and attend undercover to solve the kidnappings. The Friday Night Project. Rupert Everett "