Acceptor loci

Fig. 103. Model of the transcriptional unit in eukaryotes. /, transcription //, transformation III, translation P, promotor acceptor loci other functional segments ...

Dehydrofluorination by primary and secondary aliphatic amines occurs at room temperature and is the basis of diamine cross linkmg, which occurs by dehydrofluonnation and subsequent nucleophihc substitution of the double bond The locus of dehydrofluonnation is a VDF unit flanked by two perfluoroolefin units This selectively base-sensitive methylene group also undergoes elimination as the first step in phase-transfer-catalyzed cross-hnking with quaternary ammo mum or phosphomum salts, bisphenols, and morganic oxides and hydroxides as HF acceptors [31, 32]... 

The reciprocal of a can be viewed as a mean orbital locus for the particular donor and acceptor. Thus, one might predict -1 3+3+... 

Protein acceptor Oligosaccharyitransferase Locus expressing the desired Und-PP-giycan (i.e., O antigen)... 

Studies of polymerization by donor-acceptor complexes have been carried out by Phillips et using 2-vinyl naphthalene in a ZnC -sulpholane solution. Single cell and divided cell experiments showed no difference in polymer yield, but in the divided cell the locus of polymerization was shown to be at the anode, indicating a radical-cationic or cationic mechanism, Constantin successfully copolymerized isoprene and monobutyl maleate using ZnClj in a single cell with Pt electrodes and suggests the participation of a donor-acceptor complex. 

According to their theory, as the polycistronic messenger RNA moves in relation to the polysome system, the velocity of protein synthesis in its various parts is slowed. They postulated that the sequence of the genes in the histidine operon (which does not correspond to the biochemical sequence of reactions) is connected with the number of molecules of each enzyme synthesized. By analyzing the frequency of mutations of polarity, they concluded that many triplets (of the 64 possible) can retard the transcription and translation of information. The essence of the matter is that if any nucleotide triplet (codon) XYZ requires an anticodon in the molecules of acceptor sRNA for itstranslationinto a protein "text," a lowered content of this fraction of sRNA with the corresponding anticodon may act as modulator of the velocity of translation, which is reduced at this locus in connection with a decrease in the number of codon-anticodon interactions. 

Moreover, every glycosylation event requires identification of a specific hydroxyl group to serve as an acceptor center (Scheme 1, A). In a typical hexose, the pinpointing of an acceptor site obliges one to identify one of the five potential hydroxyl groups to serve as the reaction locus for glycosylation. In some instances, this specificity or selectivity of action may reflect inherent reactivity margins between free... 

The double bond of N-acylenamino acids and their esters represents the locus minoris resistentiae . As a result of conjugation with the carboxyl group, the double bond is a good acceptor for nucleophilic addends under basic catalysis. The acylamino group makes electrophilic additions possible. It is thus possible to obtain a- or P-mercapto a-amino acid derivatives by selecting the appropriate reaction conditions for the addition of mercaptans. 

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