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Wyszukujesz frazę "Proteobacteria" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Optimization of Biosurfactant production by a novel Rhizobacterial Pseudomonas species
Autorzy:
Effiong, E.
Agwa, O. K.
Abu, G. O.
Powiązania:
https://bibliotekanauki.pl/articles/1046551.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Biosurfactant
Gammaproteobacteria
OVAT
Optimization
Proteobacteria
Pseudomonas
Quadratic functions
Rhizobacteria
Variables
Opis:
Optimization of biosurfactant has improved the value-chain, process development and cost of production associated with downstream synthesis. This study was designed to determine the optimal conditions for production of biosurfactant using hydrolyzed agroresidues under controlled conditions. Rhizobacterial isolate was obtained from Paspalum sp. growing on an aged crude oil impacted soil in Bodo, Rivers State, Nigeria. The bacterial isolates were identified using 16S rRNA molecular approach on a set of universal primers. One-Variable at a Time approach was applied for verification of pH, Carbon and nitrate sources respectively. Stat-ease Design-Expert version 12.0 was employed in the optimization of the variables while the operational conditions were fitted into a 20-run design matrix using α- level 2.0. Molecular identification confirmed the bacterial isolae to be Pseudomonas sp. with Accession number MH40927 with a gene molecular weight of 6.0kbp. Response for biomass, biosurfactant and Critical Miscelle Concentration (CMC) was observed to fit into a 2nd order Quadratic functions at p<0.05 with optimal conditions were pH = 7.0, Corn chaff = 2.0 g/L and Urea = 1.0 g/L. Biosurfactant = +51.98 + 6.79A + 4.30B 5.45C + 0.2975AB + 0.4975AC + 1.63BC-6.46A² - 3.51B² - 6.94C². This study further identified a directly proportional relationship between biosurfactant production and operational variables which represents a cheaper and feasible production roadmap for biosynthesis.
Źródło:
World Scientific News; 2019, 137; 18-30
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Różnorodność biologiczna i rola bakterii glebowych w środowisku leśnym
Biodiversity and the role of soil bacteria in a forest environment
Autorzy:
Siebyła, H.
Hilszczańska, D.
Powiązania:
https://bibliotekanauki.pl/articles/988995.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
gleby lesne
ryzosfera
bakterie glebowe
roznorodnosc biologiczna
Bacillus
Proteobacteria
Actinobacteria
funkcje biologiczne
mechanizm dzialania
bacteria
forest soil
rhizosphere
Opis:
Microorganisms commonly inhabit all environments in which they can survive. The number of bacteria in soil depends on its structure, moisture and nutrient content, and ranges from a few hundred to several thousand per gram of soil. Qualitative and quantitative composition of bacteria mainly depends on physico−chemical agents, soil and vegetation cover, the content of biogenic elements, but also on the salinity and pollution. In the case of forest soils number of bacteria amounts to about 4.8×10 9 per 1 cm 3 of soil. In the rhizosphere, the soil directly surrounding plant roots, there are organisms that affect the biochemical activity of plants. The main representatives of bacteria, which are present in the rhizosphere layer, are species of the genera: Pseudomonas and Bacillus, Acidobacteria that protect plants against attack of pathogens. Soil microorganisms form a symbiosis with vascular plants. Because of their properties, they are effective antagonists against fungi that cause plant diseases (leaf spots, roots and shoot apices disease, as well as rot). This group includes such species as: Sclerotinia sclerotiorum, Botrytis cinerea and Colletotrichum gloeosporioides or the species belonging to Oomycetes, for example Phytophthora and Pythium. Bacteria also protect plants against harmful insects and inhibit the growth of fungal diseases. The beneficial role of bacteria is observed in the development of truffles as well. They are responsible for providing nitrogen to the mycelium forming fruiting bodies. Bacteria improve plant growth and protect their host against drought. Understanding the diversity of bacteria that have important role in the functioning of ecosystems, including forest ecosystems, remains a challenge for microbiologists.
Źródło:
Sylwan; 2017, 161, 02; 155-162
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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