* Removal of the insecticide diazinon from liquid media by free and immobilized Streptomyces sp. isolated from agricultural soil.
- From an agricultural soil that had received continuous applications of organophosphorus pesticides, 30 actinobacteria strains were isolated. Two strains, identified as Streptomyces sp. AC1-6 and Streptomyces sp. ISP4, were selected because of their tolerance to diazinon and based on the relationship between diazinon removal and microbial growth. In liquid medium with diazinon at concentrations of 25 and 50 mg L(-1), both strains were able to remove approximately 40-50% and 70-90% of the initial diazinon after 24 and 96 h of incubation, respectively. This diazinon removal was accompanied by microbial growth of the strains, an initial pH decrease, and glucose consumption in the liquid medium. Evaluation of the diazinon removal achieved by the free actinobacteria and Streptomyces sp. AC1-6 immobilized on alginate beads revealed that the immobilized cells exhibited a 60% higher diazinon removal compared with the free cells. The reusability of the encapsulated biomass was confirmed, and a diazinon removal rate of more than 50% was obtained after the second batch. This work constitutes one of the few reports that describe Streptomyces strains as diazinon degraders. Given the high diazinon removal found, the streptomycetes exhibit suitable potential as diazinon-degrading actinobacteria for elimination of diazinon from liquid residues.
=>茂み, 成長, 増加, 発展, 栽培, 腫よう, 成長物
Overview of noun growth
The noun growth has 7 senses (first 5 from tagged texts)
1. (37) growth, growing, maturation, development, ontogeny, ontogenesis -- ((biology) the process of
an individual organism growing organically; a purely biological unfolding of events involved in an
organism changing gradually from a simple to a more complex level; "he proposed an indicator of
osseous development in children")
2. (20) growth -- (a progression from simpler to more complex forms; "the growth of culture")
3. (3) increase, increment, growth -- (a process of becoming larger or longer or more numerous or
more important; "the increase in unemployment"; "the growth of population")
4. (3) growth -- (vegetation that has grown; "a growth of trees"; "the only growth was some salt
grass")
5. (1) emergence, outgrowth, growth -- (the gradual beginning or coming forth; "figurines presage
the emergence of sculpture in Greece")
6. growth -- ((pathology) an abnormal proliferation of tissue (as in a tumor))
7. growth -- (something grown or growing; "a growth of hair")
--- WordNet end ---