Jeq50395 1160..1169
نویسندگان
چکیده
Aeration improves the capacity of leachfields to decontaminate and reduce the nutrient load of wastewater. To gain a better understanding of the effects of aeration, we examined the faunal and microbial communities of septic system leachfield soil (0–4 and 4–13 cm) using replicated (n 5 3) mesocosms that were actively aerated (AIR) or unaerated (LEACH). Protozoa were 40 to 140 times more abundant in AIR than in LEACH soil. No nematodes were found in LEACH soil, whereas AIR soil contained 5 to 14 3 10 nematodes (all bacteriovores) kg. Active microbial biomass was four to five times higher in AIR than LEACH soil. Proteobacteria and actinomycetes/ sulfate-reducing bacteria constituted a higher proportion of the community in AIR soil, whereas anaerobic Gram-negative bacteria/ firmicutes were more prominent in LEACH soil. Ratios of prokaryotic to eukaryotic phospholipid fatty acids (PLFAs) were higher in LEACH soil, as were membrane stress index values, whereas the starvation index was higher in AIR soil. Community-level physiological profiles showed that 29 and 30 different substrates were used for growth by LEACH and AIR soil microorganisms, respectively. The AIR soil had more microorganisms capable of growing on 10 substrates, whereas growth on two substrates was higher in LEACH soil. Polymerase chain reaction–denaturing gradient gel electrophoresis (PCR-DGGE) analysis of 16S rRNA gene fragments revealed greater diversity of dominant phylotypes in AIR than LEACH soil, with communities separated by treatment. Aerated leachfield soil had a larger and more diverse faunal and microbial community than unaerated soil, possibly due to differences in the type and availability of
منابع مشابه
Light dilution via wavelength management for efficient high-density photobioreactors.
The spectral distribution of light influences microalgae productivity; however, development of photobioreactors has proceeded largely without regard to spectral optimization. Here, we use monochromatic light to quantify the joint influence of path length, culture density, light intensity, and wavelength on productivity and efficiency in Synechococcus elongatus. The productivity of green light w...
متن کاملIdentification of an immunodominant and highly immunopathogenic determinant in the retinal interphotoreceptor retinoid-binding protein (IRBP)
Interphotoreceptor retinoid-binding protein (IRBP), a glycoprotein specific for the retina and pineal gland, induces inflammatory changes in these two organs in immunized animals. We report here on the identification of an immunodominant determinant of bovine IRBP that is highly immunogenic and immunopathogenic in the Lewis rat. The peptide, which comprises the sequence 1169-1191 of bovine IRBP...
متن کاملTwo-dimensional affine frames for image analysis and synthesis
An affine-group-based design methodology of Gabor-type filter bank is presented for the purpose of image analysis and synthesis. Various tessellations of the combined spatial-feature space are considered. We combine ideas introduced by Daugman [J.G. Daugman, Uncertainty relation for resolution in space, spatial frequency, and orientation optimized by two-dimensional visual cortical filters, J. ...
متن کاملA Complete Bibliography of Publications in the Journal of Mathematical Physics: 2000–2004
(1 + 1) [278, 1816, 365, 1699]. (2 + 1) [507, 33, 487, 1110, 1492, 271]. (2m, 2n) [1307]. (2N) [1932]. (3/2) [591]. (5) [777]. (:φ: )2 [1788]. (dX/dx) + λX = 0 [1031]. (λ/4!)(φ1 + φ 4 2)d [813]. (M +N) [1110]. (n) [518]. (N + 1) [1932]. (n ≥ 2) [413]. (p, q) [1744]. (q, h) [573]. 1 + 1 [1100, 759]. 1/2 [642, 699]. 1/N [152]. 1/r [1160]. 1: 1: 2 [1943]. 2 [936, 1777, 1669, 1733, 1636]. 2 + 1 [71...
متن کامل