Traditional way of synthesizing sensitive rhodamine starts with rhodamine B‚ amino compound‚ and some alkali additive in the presence of weak base. However‚ for RH-PY‚ the stearic hindrance of pyrene slows the reactivity‚ and the reaction does not go to completion. Therefore‚ the reaction procedure was modified as follows. First‚ HATU and DIPEA were used to activate the carboxyl group of rhodamine B‚ then the activated rhodamine B was reacted with 1-aminopyrene. By introducing this method‚ the reaction
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Different symbols are shown in “The Lesson” by Toni Cade Bambara‚ that depicts the economic and social inequality faced by society‚ specifically the children in the story. The story touches on the situation the children are stuck in living in almost poverty‚ it is up to the children to change their fate. The use of irony helps portray how the trip ended up teaching Sylvia more than she expected despite her doubt. Towards the end of the story‚ Silvia realizes that she actually was able to benefit
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Toni Morrison’s novel “A Mercy” is set in the late 1600s around modern day Pennsylvania or Virginia. Throughout the book‚ we see perspectives from multiple different people during the growing slave trade in the New World. One of the main characters is Florens‚ an African American young girl born into slavery. She is given away because of a debt to Jacob Vaark‚ a white heir to a farm. During her narrative‚ she suffers and is shown and shows compassion in many different ways‚ which evolves into to
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is the subject of many studies and investigations‚ such as William C. Dement and Christopher Vaughan’s paper‚ “Sleep Debt and the Mortgaged Mind‚” June J. Pilcher and Amy S. Walters’ article‚ “How Sleep Debt Hurts College Students‚” and Matthew Ashton’s‚ “A Greater College Debt.” Sleep debt is a massive problem; this idea is easily introduced in William C. Dement and Christopher Vaughan’s paper‚ “Sleep Debt and the Mortgaged Mind‚” with the explanation of the true cause of the Valdez incident‚ a
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Introduction: The purpose of this lab was to learn how to use salicylic acid to make aspirin. Aspirin is the most widely used over-the-counter drug in the world. The average tablet contains about 325 milligrams of acetylsalicylic acid with an inert binding material such as starch. Aspirin is used to relieve pain‚ reduce inflammation‚ and lower fever. Aspirin originally was derived by boiling the bark of the white willow tree. Although the salicin in willow bark has analgesic properties‚ purified
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experiment‚ the hood in the lab was used. The curds were placed in a 100 mL beaker and extracted using 30 mL of ethyl acetate. The curds were crushed with a stirring rod. This extraction was then gravity filtered through a funnel fitted with the filter paper. A rubber policeman was used to scrape the beaker to get as much casein as possible. This casein was then put aside in the hood safely. Boiling chips were put into an Erlenmeyer flask along with the filtrate collected. This flask was then put inside
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chapter 26‚ the relationship between Denver‚ Sethe‚ and Beloved undergoes a complete change. In the beginning‚ Sethe still fears her mother and is concerned for Beloved. Sethe meanwhile gives Beloved everything that she can‚ such as her food portions when they begin to run low; Beloved goes from being dependent and frail to fat. It gets to the point that Beloved is just blatantly taking from Sethe‚ even though Sethe is willing to give. Beloved starts wearing Sethe’s clothing and copying her mannerisms
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desire to know and to positively identify the characters by race. Yet‚ Morrison avoided the racial identifications. It is interesting to me how when we think of a certain food‚ clothing‚ or a certain action that someone may do‚ we automatically place them in a certain race. Morrison has left off this information showing us that‚ race in a way‚ does not matter. What makes a difference is that people have an issue about it. Morrison is stating that race does not make a difference‚ what is important is
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Topic: The person that you admire If you ask some teenagers: “Who do you admire?”‚ many of them will answer your question by showing their love to some singers‚ actors or famous people. But if you ask me that question‚ I will answer proudly: “The person that I admire the most is my English teacher‚ who’s just ordinary to many people but very special to me”. His name is Tuan. He taught me English when I was in secondary school. He’s known as the best English teacher in my hometown. Not only does
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ACCOUNTING 505 SYNTHESIS |Key Features of a Synthesis | (1) It accurately reports information from the sources using different phrases and sentences; (2) It is organized in such a way that readers can immediately see where the information from the sources overlap;. (3) It makes sense of the sources and helps the reader understand them in greater depth. |The Background
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