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Contact freeze dryers use contact (conduction) of the food with the heating element to supply the sublimation energy. This type of freeze dryer is a basic model that is simple to set up for sample analysis. One of the major ways contact freeze dryers heat is with shelf-like platforms contacting the samples.
Although freeze-drying is more expensive than traditional dehydration techniques, it also mitigates the change in flavor, texture, and nutritional value. In addition, another widely used industrial method of drying of food is convective hot air drying. Industrial hot air dryers are simple and easy to design, construct and maintain.
The 1985 Austrian diethylene glycol wine scandal (German: Glykolwein-Skandal) was an incident in which several Austrian wineries illegally adulterated their wines using the toxic substance diethylene glycol (a minor ingredient in some brands of antifreeze) to make the wines taste sweeter and more full-bodied in the style of late harvest wines. [1]
When solid objects like strawberries are freeze dried the original shape of the product is maintained. [19] If the product to be dried is a liquid, as often seen in pharmaceutical applications, the properties of the final product are optimized by the combination of excipients (i.e., inactive ingredients). Primary applications of freeze drying ...
During World War I, a national refrigerator car pool was established by the United States Administration to deal with problem of idle cars and was later continued after the war. [39] The idle car problem was the problem of refrigeration cars sitting pointlessly in between seasonal harvests.
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In 18th century England, gleaning was a legal right for "cottagers", or landless residents. In a small village the sexton would often ring a church bell at eight o'clock in the morning and again at seven in the evening to tell the gleaners when to begin and end work. [23] This legal right effectively ended after the Steel v Houghton decision in ...
Cyrus Hall McCormick patented an early mechanical reaper. 1900 ad for McCormick farm machines—"Your boy can operate them" 1921 International Harvester Model 101 on display at the Iowa 80 Trucking Museum, Walcott, Iowa. 1925 International Model 63 Street-Washing Truck on display at the Iowa 80 Trucking Museum, Walcott, Iowa.