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Genetic engineering.

The field of genetic engineering is reviewed with a special emphasis on in vitro DNA recombinant technology. The basic principles of the biochemistry of DNA splicing and of gene transfer are described. An important distinction is made between the insertion and cloning of genes derived from genomic DNA ("natural" genes) and of DNA synthetized in vitro ("synthetic" genes). Cloning of genes synthetized from mRNA has provided the probes necessary for the identification of genomic clones, and recently it has made possible the synthesis of specific mammalian proteins in bacteria.

DNA, Recombinant↗

[The dynamics of the microorganism count of active sludge during the aerobic treatment of sewage].

Dynamics of the active sludge microorganism quantity is studied under different cultivation regimes. It is shown that quantity of microorganisms in different physiological groups depends on the specific growth rate, micro, determined by the dilution rate and biomass recirculation level. The results may be used for selecting optimal regime of the sewage treatment system functioning.

Aerobiosis↗