Definition: Dyspnea is defined as an awareness of difficulty in breathing It is therefore a symptom, usually described by the patient as \short of breath,\ whether the sensation is due to actual difficulty in breathing or is essentially an awareness of hyperventilation. If the symptom becomes striking, it always companies with dilatation of nares, cyanosis, use of accessory muscles of respiration and abnormalities of respiratory rate, depth or rhythm

Dyspnea is defined as an awareness of difficulty in breathing It is therefore a symptom, usually described by the patient as \shortness of breath,\whether the sensation is due to actual difficulty in breathing or is essentially an awareness of hyperventilation. If the symptom becomes striking, it always companies with dilatation of nares, cyanosis, use of accessory muscles of respiration and abnormalities of respiratory rate, depth or rhythm

20.1 () Carboxylic aci id anhydrides bear two acyl groups on oxygen, as in RCOCR. They are named as derivatives of carboxylic acids. Q CH:CH2CHCOH CH,CH,CHCOCCHCH_CH3 C6H C. C. 2-Phenylbutanoic acid 2-Phenylbutanoic anhydride (c) Butyl 2-phenylbutanoate is the butyl ester of 2-phenylbutanoic acid. CH,CH,CHCOCH,CH,CH2CH

As we know from the definition, intelligent or smart packaging monitors and gives information about the quality of the packed food. According to Huis in't give Veld (1996) the changes taking place in the fresh food product can be categorised as (i) microbiological growth and metabolism resulting in pH- changes, formation of toxic compounds off-odours, gas and slime formation

SOLUTIONS TO TEXT PROBLEMS 8.1 Identify the nucleophilic anion in each reactant. The nucleophilic anion replaces bromine as a sub- stituent on carbon. (b) Potassium ethoxide serves as a source of the nucleophilic anion CH,CH,. CH,CH,: CH, Br: CH3CH2OCH3 + Br: Ethoxide ion Methyl bromide Ethyl methyl ether Bromide ion

1适用范围 本方法适用于饮用水、地下水、地表水中浓度在ug/~10ug/L的砷(包含有机砷)的 测定。 2原理概要 本方法是利用原子吸收测定砷化三氢热分解产生的砷。在本法的条件下,只有As() 被定量的转化为氢化物。为了避免误差,在测定前,其它氧化态均要转化成As()。砷与 四氢硼酸钠在盐酸介质下反应被还原为气态的砷化三氢。在193.7nm处测定吸光度

arboxylic acids, compounds of the type RCOH, constitute one of the most fre- quently encountered classes of organic compounds Countless natural products are carboxylic acids or are derived from them. Some carboxylic acids, such as acetic acid, have been known for centuries. Others, such as the prostaglandins, which are pow erful regulators of numerous biological processes remained unknown until relatively

The Federal Reserve 's job is to take away the punch bowl just as the party William McChesney martin tiously turning the steering wheel to adjust to the unexpected irregule ties of the route, but some means of keeping the monetary passenger who is in the back seat as ballast from occasionally leaning over and giving the steering wheel a jerk that threatens to send the car off the road Milton friedman

1. GDP measures both the total income of everyone in the economy and the total expendi- ture on the economy's output of goods and services. GDP can measure two things at once because both are really the same thing: for an economy as a whole, income must al expenditure. As the circular flow diagram in the text illustrates, these are alter- native, equivalent ways of measuring the flow of dollars in the economy

1.10 bjectives(教学目的和要求) Effective use of information technology has become critical to the success of business. The course is designed to prepare students for applying cutting edge formation techno logy to make advances in business practice as well as research. The course covers topics including business intelligence, logistics, information security, data warehousing, machine learning, etc