Answer:
① There are many test methods: many kinds of NMR test methods, including one-dimensional and two-dimensional, have been widely used in structural analysis and material identification; quantitative analysis is no longer limited to 1H NMR experiment, and quantitative analysis of heteronuclear and even two-dimensional NMR appears frequently;
② There are many calibration targets: most compounds have multiple sets of NMR lines, which can be used as calibration targets for quantitative analysis theoretically, which undoubtedly provides convenience for the processing of test data;
③ There are many types of quantitative information: in the literature reports, not only the integral area or intensity of the resonance spectral line is used as the data parameter of NMR quantitative analysis, but also the change value of chemical displacement under specific conditions can be used as the parameter of content determination;
④ There are many reference modes: nuclear magnetic resonance obtains the data information of quantitative analysis through direct comparison of signals. In the experiment, multiple modes such as internal standard, external standard, solvent calibration and physical calibration can be used to provide reference signals. In the determination of relative content, the mode of sample self-standard can also be used.
In a word, NMR is a mature analytical and testing method with distinct technical characteristics, multiple means, flexible methods and rich information, which has a strong competitiveness in drug analysis and identification.
Explanation:
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Joshua saw the rising batter form the cake in the oven. What Joshua
observed was because of the<span> reaction of baking soda or baking
powder with the liquid in the batter: These ingredients react together
and cause air bubbles to form. Baking powder contains sodium hydrogen carbonate
that breaks down when heated, releasing carbon dioxide that helps cake mixtures
to rise during baking.</span>
Livestock producers and breeders rank livestock on their ability to produce high quality, efficient breeding animals and market-worthy <u>offspring</u>.
To be able to effectively evaluate breeding and market animals is of vital economic importance for the animal markets. The same traits used to evaluate <u>high-grade slaughter animals</u> are also important in the <u>grading </u>of <u>breeding stock</u>.
When we judge livestock we classify them as:
- Superior livestock
- Average livestock
- Inferior livestock
We are looking for the most desirable traits to fit our particular market and genetic needs. The "Livestock Judging Manual" indicates that some of the most prevalent traits necessary to score a better rating are:
- <em>Live weight</em>
- <em>Fat depth</em>
- Muscling
and many more. The most important of which is muscling given that an animal with more muscle will produce more desirable meat for the average consumer, and therefore can be sold at higher prices.
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Answer
Ocean acidification results from the solubility of CO2 in oceans increasing the H+ concentrations, and depletion of bicarbonates concentrations.
Therefore, human activities which increases the concentration of CO2 in the atmosphere, will raise the atmospheric CO2 concentration. CO2 is constantly being absorbed by green plants maintaining its concentration through carbon cycle,Therefore massive deforestation which removes green plants, cutting down photosynthesis is one of human activities which raises CO2 levels of the atmosphere.The CO2 dissolves in the oceans to raise its acidic levels.Lower pH.
Another source is fossil fuels emissions which add more CO2 to the atmosphere.
Explanation:
