Which of the following functional groups can make an organic compound acidic? A. -OH in alcohols B. -OH in phenols C. -CHO D. -C≡C - 相关知识点: 试题来源: 解析 B。解析:酚类中的 -OH(羟基)能使有机物呈酸性,这是因为酚羟基上的氢较活泼。醇中的 -OH不能使有机物呈酸性。 -CHO(...
Intensive ungulate browsing significantly impacts forests worldwide. However, it is usually not single browsing events that lead to sapling mortality, but the little-researched interactions of browsed saplings with their biotic and abiotic environment. (
Give an example of a hydrophobic amino acid, a hydrophilic amino acid, an acidic amino acid, and a basic amino acid. Which of these categories of amino acids would mos Which of the following amino acids contain polar R-groups? What are th...
notifications, which are generally though not always interruptive. These alerts, though sometimes efficient, will come in the price of large intellectual burden and workflow disturbance. Less well examined is the design for the EHR itself-the purchasing supplier’s “choice architecture”-which “nudge...
In this way we have accessed reversible amide bond formation that allows crystalline order to develop. This strategy permits the direct synthesis of practically irreversible ordered amide networks that are stable thermally and under both strong acidic and basic hydrolytic conditions....
[27] reported that PC oligomers (up to DP 6) were degraded to monomeric flavanol residues when incubated in an acidic solution (pH ~ 2.0) for up to 3.5 h. However, there are conflicting reports on this phenomenon in both animals and humans [28], [29], [30], [31], [32], [33]...
Keratins are major structural proteins in epithelial cells. The keratin multigene family contains 50 individual members, which can be divided in two groups: (i) acidic forms and (ii) basic forms. The KRT9-23 belongs to the acidic group, whereas KRT1-8 are basic keratins [8]. Generally, ...
The liquid membrane and the support material, and the use which three acid functional groups (triacidicfunction) the p tert butyl Calyx which it possesses [6] arene, include that in 2 rank, 4 rank and 6 rank and are supportedIt regards the liquid membrane and the support material, and ...
The fractions collected are analyzed by two spectrophotometry. The absorption spectra in basic and acidic media are compared in order to determine whether substitution has indeed taken place on the hydroxyl group (Korman Clarke, ()p. cit.). The O-carboxymethylated derivatives do not show any spect...
cysteine, tyrosine, asparagine, and glutamine. The positively charged (basic) amino acids include arginine, lysine and histidine. The negatively charged (acidic) amino acids include aspartic acid and glutamic acid. Also included within the scope of the invention are rpt-1 proteins which are ...