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Classify the following change as physical or chemical: The temperature at which dry ice evaporates. Which of the following is endothermic? a. An icicle melts. b. Water evaporates from the skin. c. Liquid nitrogen boils. d. Dry ice (CO_2) sublimes (solid to gas...
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公开/公告号: US5942264 A 公开/公告日期: Aug 24, 1999 发明人: WC Monte 被引量: 10 摘要: An enzyme--ice cream composition in which a sterilized acid-sensitive lactase enzyme hydrolyzes lactose after the ice cream is frozen to a temperature less than twenty degrees Fahrenheit.收藏...
Active containers can resemble freezers, refrigerators, or even containers filled with dry ice. They allow the substances within them to be kept at a specific temperature for an indefinite length of time. On the contrary, passive packaging keeps the substances within at a specific temperature te...
It shows that the short but intense (剧烈的) exercise made the brain produce more of a chemical called “brain-derived neurotrophic factor (脑源性神经营养因子). People can remember things quickly with this chemical. 5 That’s the time when you need to sit down and start to remember ...
Metabolites were extracted on dry ice with 4 mL 80% methanol ( −80 °C), as described previously [23]. Insoluble material was pelleted by centrifugation at 3000 g for 5 min, followed by two subsequent extractions of the insoluble pellet with 0.5 mL 80% methanol, with ...
cooling bath,dry ice,MeOH/Water bath,pictures I got a request for some more details on the methanol/water bath from a few weeks back. Enjoy! Step 1: Pick a Dewar and Measure the Solvents The desired ratios are in the last post. For this example I’ll be making a -20 °C bath, ...
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