Azo dyes

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    and a right deltoid melanoma. Immediate excision biopsies were performed in order to remove the melanomas. The patient also contracted an acute lymphadenopathy. A lymph nodes biopsy was performed using two techniques: gamma probe and patent V blue dye. From these dissected lymph nodes, scientists discovered a black and blue pigment focus posing as another melanoma (Fig. 2). An urgent histology review was performed and revealed that it was not a melanoma, but it was black and blue tattoo pigment…

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    nitrite ion (NO- 2) produced during sampling is determined calorimetrically by reacting the nitrite ion with phosphoric acid, sulfanilamide, and N-(1-naphthyl)- ethylene diamine di-hydrochloride (NEDA) and measuring the absorbance of the highly colored azo-dye at 540 n m. Calculation: C (NO2 µg/m3) = (As – Ab) x CF x Vs/ Va x Vt x 0.82 Where, C NO2 = Concentration of Nitrogen dioxide, µg/m3 As = Absorbance of sample Ab = Absorbance of reagent blank CF = Calibration factor Va = Volume of…

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    treated with chemicals to dye them, make them more hardwearing or wrinkle-resistant, or less flammable. Some of these chemicals are carcinogenic or may cause harm to children even before birth. Others may trigger allergic reactions in some people. Some flame retardants that are used in certain textiles contain organic bromine compounds that are persistent (break down very slowly in the environment). The use of some dangerous chemicals in textiles is restricted such as azo dyes and formaldehyde.…

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    Blood Brain Barrier Essay

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    Scientific Background and Long-term Objectives Blood brain barrier (BBB) is a selectively permeable membrane that controls the passage of substances from the bloodstream to the central nervous system (CNS).Poor penetration of the drugs with various compositions across the BBB is evident in the biomedical research. This impacted greatly the pharmaceutical interventions of various neurodegenerative disorders, brain tumours and impairment of the CNS [1].BBB is the main route for the therapeutic…

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    2.4 Luxury and Sustainability 
On the bases of financial value of a luxury product, consumers are ready to pay a premium price of the goods. These goods are not normal goods as it holds qualities of being luxury with its quality level, scarcity and aspiration. As stated above, luxury deals with scarcity and scarcity is related to something which is on the verge of extension or of a very limited supply. Therefore we can say that if a luxury product is encouraged for a more reasonable price, this…

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    (HNO2) is used as a source of nitrosonium ion (N≡O+). The nitrosonium ion by reacting with an aromatic amine converted into a diazonium salt. As diazonium ion is a weak electrophile, it reacts with electron-rich, aromatic coupling agents to produce an azo dye. The products are mainly ortho and para due to the reaction being an electrophilic aromatic substitution Reaction: p-nitroaniline p-nitro benzenediazonium chloride Para-red Procedure: Production of…

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    Pollution is one of the most serious problems that affect our environment, and its effects on all life aspects are clear to everyone. Because of this, pollution is one of the most serious issues that all the word countries are concerned about. As time goes, the pollution problem increases and also the population growth increase. The increase in demand for water and food supplies place an increasing stress on the ground and surface water quality and quantity. One of the environmental problems…

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