Adsorption,Kinetics and Equilibrium Studies on Removal of Catechol and Resorcinol from Aqueous Solution Using Low-Cost Activated Carbon Prepared from Sunflower (<Emphasis Type="Italic">Helianthus annuus</Emphasis>) Seed Hull Residues     

Ephraim Vunain  Dégninou Houndedjihou  Maurice Monjerezi  Adolp Anga Muleja  BarthélémyTomkouani Kodom 《Water, air, and soil pollution》2018,229(11):366

This study reports on the feasibility of remediation of catechol- and resorcinol-contaminated water using low-cost sunflower seed hull activated carbon (SSHAC). Sunflower seed hull (SSH), an abundant agricultural waste in Malawi, was used as precursor to prepare highly porous activated carbon by physicochemical activation, with zinc chloride (ZnCl₂) as an activating agent. The activated carbon was characterized by FTIR, SEM-EDS, XRD and BET analyses. In this work, pertinent parameters that affect the adsorption efficiency—pH, initial adsorbate concentration, contact time, adsorbent dosage, and solution temperature—were investigated in batch mode. At the same experimental conditions, more catechol was adsorbed than resorcinol may be due to the compound’s affinity towards water and the position of the hydroxyl group on the benzene ring. A maximum equilibrium adsorption of 271 and 250 mg/g was obtained at pH 9.0 and pH 8.0 for catechol and resorcinol, respectively. The adsorption behaviour of both adsorbates (catechol and resorcinol) on SSHAC can be well described by Langmuir isotherm model and pseudo-second-order kinetic model. The value ?G, ?S and ?H indicated spontaneous and endothermic adsorption process. The adsorption process was readily reversible allowing reusability of the adsorbate. This study’s outcome is value addition to this category of wastes for environmental protection.  相似文献   

Modulation of rat hepatic and pulmonary cytochromes P450 and phase II enzyme systems by erucin, an isothiocyanate structurally related to sulforaphane     

Hanlon N  Okpara A  Coldham N  Sauer MJ  Ioannides C 《Journal of agricultural and food chemistry》2008,56(17):7866-7871

Administration of dietary doses of the isothiocyanate erucin had no effect on rat hepatic cytochrome P450 activity or protein levels, but at higher doses a rise in CYP1A/B1 protein levels was evident. In lung, treatment with erucin, as well as sulforaphane, failed to modulate cytochrome P450 activities but elevated CYP1A/B1 protein levels. In liver, erucin stimulated quinone reductase activity accompanied by a rise in protein. Glutathione S-transferase activity was unaffected, but GSTalpha and GSTmu protein levels increased. In lung, both isothiocyanates increased quinone reductase paralleled by a rise in protein levels; at the higher dose both isothiocyanates elevated moderately GSTalpha levels. Hepatic microsomes converted both isothiocyanates to metabolites that impaired cytochrome P450 activity, which was antagonized by reduced glutathione. It may be concluded that erucin may protect against carcinogens by stimulating the detoxication of quinones but is unlikely to significantly influence reactive intermediate generation through modulation of cytochrome P450 activity.  相似文献   

Formulation and application of entomopathogenic nematode‐infected cadavers for control of Hoplia philanthus in turfgrass     

Minshad A Ansari  M Abid Hussain  Maurice Moens 《Pest management science》2009,65(4):367-374

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Root-lesion nematodes in cereal fields: importance,distribution, identification,and management strategies     

Mokrini  Fouad  Viaene  Nicole  Waeyenberge  Lieven  Dababat  Abdelfattah A.  Moens  Maurice 《植物病害和植物保护杂志》2019,126(1):1-11

Journal of Plant Diseases and Protection - Root-lesion nematodes of the genus Pratylenchus are among the most important nematode pests that limit production of small-grain cereals. Four...  相似文献   

The influence of temperature,pH/molarity and extractant on the removal of arsenic,chromium and zinc from contaminated soil     

Lea Rastas Amofah  Christian Maurice  Jurate Kumpiene  Prosun Bhattacharya 《Journal of Soils and Sediments》2011,11(8):1334-1344

Purpose  

Normal soil washing leave high residual pollutant content in soil. The remediation could be improved by targeting the extraction to coarser fractions. Further, a low/high extraction pH and higher temperature enhance the pollutant removal, but these measures are costly. In this study, the utility of NaOH, oxalate–citrate (OC) and dithionite–citrate–oxalate (DCO) solutions for extracting of arsenic, chromium and zinc from contaminated soil were assessed and compared. In addition the effects of NaOH concentration and temperature on NaOH extractions, and those of temperature and pH on OC and DCO extractions, were evaluated.  相似文献   

Development of two species-specific primer sets to detect the cereal cyst nematodes Heterodera avenae and Heterodera filipjevi   总被引：1，自引：0，他引：1  

Fateh Toumi  Lieven Waeyenberge  Nicole Viaene  Amer Dababat  Julie M. Nicol  Francis Ogbonnaya  Maurice Moens 《European journal of plant pathology / European Foundation for Plant Pathology》2013,136(3):613-624

Twelve Heterodera species are of major economic significance in wheat and barley. Of these, H. avenae, H. filipjevi and H. latipons are among the most important ones, and sometimes coexist. The identification of Heterodera species using morphological characteristics is time consuming, requires specialized skill and can be imprecise, especially when they occur mixed in field populations. Molecular techniques can provide a more accurate way for nematode identification. This study reports the results of experiments targeting the mitochondrial cytochrome oxidase subunit 1 (COI) gene to develop species-specific primers that could be used for the identification of H. avenae and H. filipjevi. The COI gene of 9 Heterodera spp. and Punctodera punctata was partially sequenced and the resultant sequences were aligned to find unique sites suitable for the design of primers. The alignment showed variability between H. avenae, H. filipjevi and other Heterodera species. Two sets of species-specific primers were identified for the identification of both species and the conditions for their use in PCR were optimised. The specificity of the designed primers was checked by comparison with one population of P. punctata and populations of 14 other Heterodera species, nine populations of H. avenae and 10 populations of H. filipjevi originating from different countries. To test the sensitivity, the PCR was run with DNA extracted from five second-stage juveniles (J2) of H. avenae or five J2 of H. filipjevi mixed with DNA extracted from varying numbers of J2 of H. latipons. It was possible to detect as few as five J2 of H. avenae or H. filipjevi among 100 J2 of H. latipons. The two primers sets allow the detection of H. avenae and H. filipjevi where they occur in mixed populations with other Heterodera spp.  相似文献   

Assessment of the Probiotic Potential of a Dairy Product Fermented by Propionibacterium freudenreichii in Piglets     

FJ Cousin  B Foligné  SM Deutsch  S Massart  S Parayre  YL Loir  G Boudry  G Jan 《Journal of agricultural and food chemistry》2012,60(32):7917-7927

Dairy propionibacteria, including Propionibacterium freudenreichii , display promising probiotic properties, including immunomodulation. These properties are highly strain-dependent and rarely studied in a fermented dairy product. We screened 10 strains, grown in a newly developed fermented milk ultrafiltrate, for immunomodulatory properties in vitro. The most anti-inflammatory strain, P. freudenreichii BIA129, was further tested on piglets. P. freudenreichii -fermented product improved food intake and growth of piglets. Colonic mucosa explants of treated pigs secreted less interleukin 8 (-25%, P < 0.05) and tumor necrosis factor α (-20%, P < 0.05), either in basal conditions or after a lipopolysaccharide challenge. By contrast, the gut structure, barrier function (measured ex vivo in Ussing chambers), microbial diversity (assessed by 16S rRNA pyrosequencing), and colonic short-chain fatty acid content were unchanged, assuming maintenance of normal intestinal physiology. In conclusion, this work confirms in vivo probiotic properties of dairy propionibacteria-fermented products, which are promising for the prevention or healing of inflammatory bowel diseases.  相似文献   

Derivatives of Salarin A,Salarin C and Tulearin A—Fascaplysinopsis sp. Metabolites     

Lee Goren Zur  Ashgan Bishara  Maurice Aknin  Drorit Neumann  Nathalie Ben-Califa  Yoel Kashman 《Marine drugs》2013,11(11):4487-4509

Derivatives of salarin A, salarin C and tulearin A, three new cytotoxic sponge derived nitrogenous macrolides, were prepared and bio-evaluated as inhibitors of K562 leukemia cells. Interesting preliminary SAR (structure activity relationship) information was obtained from the products. The most sensitive functionalities were the 16,17-vinyl epoxide in both salarins, the triacylamino group in salarin A and the oxazole in salarin C (less sensitive). Regioselectivity of reactions was also found for tulearin A.  相似文献   

Vasectomy—How and why     

W. Maurice Webster B.Sc M.R.C.V.S. 《New Zealand veterinary journal》2013,61(1):10-13

Extract

Some twenty years ago, just before the dawn of the present era of artificial breeding, the writer was discussing with Mr. Roland Perry—the then owner of New Zealand's most famous Southdown foundation sire, “Ford Christian”—ways and means of securing the maximum number of progeny. At that time the recognized method was hand service of ewes picked out by aproned teaser rams. This method had its risks and limitations. The apron might slip and mesalliance occur, but in any case the ram quickly became exasperated by his unsuccessful efforts and refused to work. Conversation turned to what was then an extremely topical and controversial subject—viz., the official adoption in Germany of compulsory sterilization by vasoligation of what were regarded as undesirable human types. This method is applicable to both sexes, is permanent and foolproof, but by leaving the gonads intact causes no interference with normal sexual appetite and intercourse. The question arose as to whether vasoligation (Steinach's operation) in the ram should not produce the ideal teaser. The upshot was that Mr. Perry agreed to supply a number of cull rams for experimental surgery, and the first tentative essays were made in evolving an operative technique.  相似文献   

pH-dependent interaction of fumonisin B1 with cholesterol: physicochemical and molecular modeling studies at the air-water interface.     

Radhia Mahfoud  Marc Maresca  Maurice Santelli  Annie Pfohl-Leszkowicz  Antoine Puigserver  Jacques Fantini 《Journal of agricultural and food chemistry》2002,50(2):327-331

Langmuir film balance technology was used to study the interaction between the mycotoxin fumonisin B1 (FB1) and cholesterol. FB1 was added in the aqueous subphase underneath a monomolecular film of cholesterol, and the interaction was measured as an increase in the surface pressure of the film. Above pH 9, a strong inhibition of the reaction was observed. Similar results were obtained with the bile salt sodium taurocholate. The FB1-cholesterol complex was reinforced by NaCl but was destabilized by NaF, a salt known to break hydrogen bonds. These data suggest that the molecular association between FB1 and cholesterol involves both hydrophobic interactions and a hydrogen bond between the NH3(+) group of FB1 and the OH group of cholesterol. Molecular mechanics simulations of the FB1-cholesterol complex were consistent with this hypothesis. These data may shed some light on the mechanisms involved in the intestinal absorption of FB1 and its biliary excretion.  相似文献