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:
http://www.creative-biostructure.com/nmr-services_28.htm
Answer:
Explanation:
Comparing objects or things using "as" or "like" is referred to as "simile".
<u>Here:</u>
"You" is being compared to "actor who has practiced his lines" using "like" for being "well-prepared".
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Most copper compounds tend to settle down near the water sediments or near the soil particles and can be monitored from there.
<u>Explanation:</u>
Copper can be discharged into the earth by both natural sources and human exercises. Copper is regularly found close to mines, modern settings, landfills and waste removals. Most copper mixes will settle and will undoubtedly either water silt or soil particles.
Copper doesn't separate in the earth and due to that it can gather in plants and creatures when it is found in soils. At the point when the dirt of farmland are dirtied with copper, animals will assimilate fixations that are harming to their well being.
TRNA take amino acids to the ribosome.
Answer:
The arrow points from the organism being eaten to the organism that eats it.
Explanation:
