Derxia

Derxia

[′dərk·sē·ə]
(microbiology)
A genus of bacteria in the family Azotobacteraceae; rod-shaped, pleomorphic, motile cells; older cells contain large refractive bodies.
References in periodicals archive ?
The different N free media used were Waksman No 77 medium for Azotobacter, Becking' s medium (Becking, 1961) for Beijerinckia, Nitrogen-free glucose mineral medium for Derxia (Becking, 1961) and King's B medium (King et al.
The isolates DeLTP2 and DeATM3 were found to be closely comparable to Methylocella silvestri and Derxia sp.
The beta proteobacteria was represented by Derxia (DeLT[P.
These bacteria are of beneficial agricultural importance and belong to the genera Acetobacter, Acinetobacter, Alcaligenes, Arthrobacter, Azoarcus, Azospirillum, Azotobacter, Bacillus, Beijerinckia, Burkholderia, Derxia, Enterobacter, Gluconacetobacter, Klebsiella, Ochrobactrum, Pseudomonas, Rhodococcus, Serratia, Zoogloea, etc (Singh et al.
Las bacterias diazotrofas puede ser simbioticas (obligadas, asociativas o endofitas) y de vida libre, representadas en Rhizobium y Frankia para las obligadas y por Cyanobacteria, Azospirillum, Azotobacter, Acetobacter diazotrophicus, Azoarcus entre las asociativas o endofitas; Achromobacter, Acetobacter, Alcaligenes, Arthrobacter, Azospirillum, Azotobacter, Azomonas, Bacillus, Beijerinckia, Clostridium, Corynebacterium, Derxia, Enterobacter, Herbaspirillum, Klebsiella, Pseudomonas, Rhodospirillum, Rhodopseudomonas y Xanthobacter, entre las no simbioticas.
4]cfu/g) from soil samples and different isolates on different nitrogen-deficient media Soil sample Jensen's Burk's KE NFA LGI Dobereiner's 1 530 500 30 47 30 32 2 610 570 34 52 39 35 3 390 350 38 40 36 38 4 400 370 31 32 41 38 5 590 520 36 31 32 30 6 760 680 42 65 43 39 7 570 530 39 49 37 32 Soil sample Beijerinckia Derxia Isolate no.
O genero Derxia pertence a classe [beta]-proteobacteria e a familia Alcaligenaceae e possui apenas uma especie descrita a D.
Os trabalhos realizados com Derxia sao escassos, sendo que pouco se conhece sobre a ecologia desta bacteria.
Bacterias do genero Derxia, foram isolados de raizes de Oriza perenne cultivados em solos de varzea na regiao Amazonica (Magalhaes, 1981) e ainda em arroz e outras plantas em solos geralmente alagados e ricos em materia organica (Dobereiner et al.
Ha especies que protegem o sitio com quantidades significativas de exopolissacarideos ou pelo aumento da taxa de respiracao como as dos generos Azotobacter, Derxia e Beijerinckia e por isso podem ser isoladas me meios de cultura solidos (em placas) ou liquidos (eg.