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排序方式: 共有74条查询结果,搜索用时 19 毫秒
51.
Meryem Jemli Fatma Karray Firas Feki Slim Loukil Najla Mhiri Fathi Aloui Sami Sayadi 《环境科学学报(英文版)》2015,27(4):102-112
The present work presents a study of the biological treatment of fish processing wastewa at salt concentration of 55 g/L. Wastewater was treated by both continuous stirred-ta reactor(CSTR) and membrane bioreactor(MBR) during 50 and 100 days, respectively. Th biological processes involved salt-tolerant bacteria from natural hypersaline environme at different organic loading rates(OLRs). The phylogenetic analysis of the correspond excised DGGE bands has demonstrated that the taxonomic affiliation of the most domin species includes Halomonadaceae and Flavobacteriaceae families of the Proteobacteria(Gamm proteobacteria class) and the Bacteroidetes phyla, respectively. The results of MBR w better than those of CSTR in the removal of total organic carbon with efficiencies from 97 to 98.6%. Nevertheless, salinity with increasing OLR aggravates fouling that requires m cleaning for a membrane in MBR while leads to deterioration of sludge settleability a effluent quality in CSTR. 相似文献
52.
Abidli Sami Pinheiro Marlene Lahbib Youssef Neuparth Teresa Santos Miguel M. Trigui El Menif Najoua 《Environmental science and pollution research international》2021,28(21):26643-26652
Environmental Science and Pollution Research - The objective of the present study was to evaluate the potential toxic effects of polyethylene microplastics (PE-MPs) (40–48 μm) on the... 相似文献
53.
Panu Välimäki Sami M. Kivelä Maarit I. Mäenpää 《Behavioral ecology and sociobiology》2011,65(11):2037-2047
Inbreeding depression is a relative decline in fitness in offspring of related parents. The magnitude of inbreeding costs
varies among taxa and may increase under stressful conditions. Inbreeding tolerance is expected to be low and selection for
inbreeding avoidance intense when both sexes invest substantially in shared offspring like in nuptial gift-giving butterflies.
This is especially true for increasing mating rate for inbreeding avoidance as nuptial feeding decreases net costs of mating
for females. We explored implications of inbreeding in the nuptial gift-giving green-veined white butterfly, Pieris napi. Compared to outbred ones, partially inbred (F = 0.25) eggs and neonate larvae had 25% lower hatching success and 30% lower survival until adult eclosion, respectively.
Inbreeding was also associated with small size. Yet, the magnitude of inbreeding depression was independent of larval conditions.
A lack of assortative mating and mating durations independent of mating type suggest that neither females nor males discriminate
close relatives (r = 0.5) as mates. Indicative of a postcopulatory mechanism to avoid inbreeding, female remating intervals decreased following
incestuous matings. Such a plastic response may affect the level of postcopulatory sexual selection as female remating interval
(time between successive matings) is necessarily negatively correlated with mating rate (matings per unit time) and mating
frequency (lifetime number of matings), and precopulatory mate choice appeared insignificant. Moreover, incest-induced shift
in the phenotype towards the adaptive peak may contribute to the evolution of female mating rates, although alternative explanations
for polyandry besides material benefits have rarely been invoked when nuptial feeding is involved. 相似文献
54.
Sarra Aloui Tesnim Ghazouani Rachid Salghi Mohamed Hedi Hamdaoui Sami Fattouch 《Journal of environmental science and health. Part. B》2013,48(9):654-660
In the present work, the promising bioinformatic tools, based on structure–affinity analysis, allowed to screen several pesticides supposed to bind to the insect immune Phenoloxidases (PO). First, the binding of aminoparathion, a reference compound, to the PO was structurally (3D) validated in accordance with previous reports. Second, using the same docking conditions, a range of pesticides was checked for their binding ability to the crystal 3D structure (PDB 3HSS) of the insect Manduca sexta (Lepidoptera) PO. The obtained data showed that many of the tested pesticides were able to bind, in silico, to M. sexta PO. The combination of in vitro (chemical and biochemical) and in silico (automated docking) approaches was found advantageous to elucidate the behavior of phenolic pesticides as substrate-analogues when binding to the active site of insect POs. Our findings emphasize new ecotoxicological aspects of pesticide residues in the agro-chemical and environmental circles. 相似文献
55.
Imen Bekri-Abbes Sami Bayoudh Mohamed Baklouti 《Journal of Polymers and the Environment》2006,14(3):249-256
Waste of polystyrene was converted into a cation exchange resin and was used for the removal of lead and cadmium metals from aqueous solution. Wastes consisting of coffee cups were crushed into small pieces and immersed into a solution of sulfuric acid in order to attach sulfonic group to polymer chain, these groups are responsible for the exchange properties of the modified plastic. The cation exchange capacity (CEC) was determined and was comparable to commercial exchangers. The adsorption isotherms of resin with synthetic wastewater containing lead and cadmium ions were tested. Adsorption analysis results obtained at various concentrations showed that the adsorption pattern on the resin followed Langmuir isotherms. 相似文献
56.
Potential of Nassarius nitidus for monitoring organotin pollution in the lagoon of Bizerta (northern Tunisia) 总被引:1,自引:0,他引:1
Youssef Lahbi Sami Abidli Pablo Rodr′?guez Gonz′alez Jos′e Ignacio Garc′?a Alonso Najoua Trigui-El Menif 《环境科学学报(英文版)》2011,23(9):1551-1557
Imposex and butyltin burden were assessed in Nassarius nitidus, Bolinus brandaris and Hexaplex trunculus collected at five stations in the Bizerta lagoon. Biological analysis showed that imposex followed type (a) in N nitidus (distal evolution), against type (d) in the two muricids (proximal evolution). Imposex indices were higher in sites located nearby sources of tributyltin and N nitidus was the least affected species of the five sites, followed by B. brandaris and H. trunculus. Butyltin analysis showed lower accumulation in N nitidus followed by H. trunculus and B. brandaris. This study has allowed the gathering of data on imposex in a snail studied for the first time in Tunisia (N. nitidus). It suggests the possibility of using such snail as a complementary species for organotin monitoring programs in the Mediterranean and further confirmed that H. trunculus is the most suitable species for such investigations. 相似文献
57.
Birgitta S. Tullberg Gabriella Gamberale-Stille Titti Bohlin Sami Merilaita 《Behavioral ecology and sociobiology》2008,62(9):1389-1396
Camouflage and warning colouration are two important forms of protective colouration. We have studied the detectability of
two seasonal colourations in the aposematic striated shieldbug, Graphosoma lineatum. The typical colouration of this insect is red and black, which is also the colouration of the reproductive post-hibernation
bugs in our study area in south central Sweden. However, the majority of newly eclosed adults in late summer exhibit a ‘pale’
(light brownish, non-red) and black striation, and these bugs appear quite cryptic to the human eye when sitting on the dried
stems and umbels of their host plants. In experiments using photographs of prey in the late-summer habitat shown on a computer
screen, we compared the time to detection by human subjects of bugs, which had been manipulated to show either of the two
typical seasonal colourations. Time to detection was significantly longer for the pale and black than for the red-and-black
striation in images with the bug photographed at two different distances. This indicates that the pale pre-hibernation striation
may have a cryptic function. In a separate experiment, we tested detectability of striated and non-striated manipulations
of bug pre-hibernation colouration against the late-summer background, and found that time to detection was significantly
longer for the striated bugs. We discuss potential functional explanations for the seasonal ontogenetic colour plasticity
and suggest that the epidermal pale colour in the late summer provides a benefit of increased camouflage. 相似文献
58.
59.
Sami A. Fam David M. Falatko Joseph E. Higgins Stewart Mountain Anthony J. Pirelli Michael Gaudette 《补救:环境净化治理成本、技术与工艺杂志》2012,22(4):49-74
This article describes a design approach that has been developed for bioremediation of chlorinated volatile organic compound–impacted groundwater that is based upon experience gained during the past 17 years. The projects described in the article generally involve large‐scale enhanced anaerobic dechlorination (EAD) and combined aerobic/anaerobic bioremediation techniques. Our design approach is based on three primary objectives: (1) selecting and distributing the proper additives (including bioaugmentation) within the targeted treatment zone; (2) maintaining a neutral pH (and adding alkalinity when needed); and (3) sustaining the desired conditions for a sufficient period of time for the bioremediation process to be fully completed. This design approach can be applied to both anaerobic and aerobic bioremediation systems. Site‐specific conditions of hydraulic permeability, groundwater velocity, contaminant type and concentrations, and regulatory constraints will dictate the best remedial approach and design parameters for in situ bioremediation at each site. The biggest challenges to implementing anaerobic bioremediation processes are generally the selection and delivery of a suitable electron donor and the proper distribution of the donor throughout the targeted treatment zone. For aerobic bioremediation processes, complete distribution of adequate concentrations of a suitable electron acceptor, typically oxygen or oxygen‐yielding compounds such as hydrogen peroxide, is critical. These design approaches were developed based on understanding the biological processes involved and the mechanics of groundwater flow. They have evolved based on actual applications and results from numerous sites. An EAD treatment system, based on our current design approach, typically uses alcohol as a substrate, employs groundwater recirculation to distribute additives, and has an operational period of two to four years. An aerobic in situ treatment system based on our current design approach typically uses pure oxygen or hydrogen peroxide as an electron acceptor, may involve enhancements to groundwater flow for better distribution, and generally has an operational period of one to four years. These design concepts and specific project examples are presented for 17 sites. © 2012 Wiley Periodicals, Inc. 相似文献
60.
Samet Mariem Karray Fatma Mhiri Najla Kamoun Lotfi Sayadi Sami Gargouri-Bouzid Radhia 《Environmental science and pollution research international》2019,26(21):21404-21415
Environmental Science and Pollution Research - Phosphoric acid production and olive oil production are among the most important economical sectors in Tunisia. However, they generate huge amounts of... 相似文献