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1.
Khaled Mguis Nadia Ben Brahim Ali Albouchi Mbarka Yakkoubi-Tej Asma Mahjoub Zeineb Ouerghi 《Genetic Resources and Crop Evolution》2008,55(5):665-674
In order to study the salt effect on the wild wheat and durum wheat, three accessions of Aegilops geniculata L. from Ain zana, Zaghouan, and Sbitla and one variety of wheat (Triticum durum L.) have been grown in the INRAT green house and treated with different salt concentrations. The morphological, phenological
and yield characters have been measured for each plant and analyzed using SAS software. This study has shown a high degree
of variation of these characters mainly related to geographical origin. It was observed also that Sbitla accession was less
affected by the imposed salt stress than all the others while Ain zana was the most affected one. 相似文献
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Olfa Baâtour Jun Huang Nawel Nasri Imen Ben Salah Imen Tarchoun Maha Zaghdoudi Margaret Y. Gruber Mokhtar Lachaâl Zeineb Ouerghi Abdelali Hannoufa 《植物养料与土壤学杂志》2012,175(4):641-648
In this study, we report on the relationship between individual antioxidant carotenoids, phenolic fractions, and flavonoids and attenuating NaCl toxicity in two contrasting varieties of lettuce (Lactuca sativa L., var. Verte and Romaine), as a means of developing more precise targets for lettuce breeding. In seedling leaves, carotenoid levels increased under NaCl stress in Verte, but remained unchanged in Romaine. Chlorogenic acid (CGA), a soluble polyphenol abundantly present in leaves, was the only phenolic acid that accumulated significantly in both varieties and was predominant under salinity. Remarkably, CGA was more prominent in Verte than Romaine at moderate salinity levels (100 mM). Foliar flavonoid levels were also differentially increased in both seedling types grown under 100 mM NaCl, but dropped significantly in both varieties under 200 mM NaCl. Germination, which was overall more salt‐resistant in Romaine, was significantly increased under salt stress by application of low dosage (10–6 to10–5 M) of CGA to Verte, but not to Romaine. These results suggest that CGA is involved in modulating NaCl‐induced oxidative‐stress responses during seed germination in Verte. 相似文献
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Investigation of Nitrification and Denitrification in the Sediment of Wastewater Stabilization Ponds
Chema Keffala Marcello Galleguillos Ahmed Ghrabi Jean-Luc Vasel 《Water, air, and soil pollution》2011,219(1-4):389-399
Kinetic studies of nitrification and denitrification were carried out on reconstituted cores of sediments taken from wastewater stabilization ponds. This study aims to quantify the nitrification and denitrification in the sediment and to offer kinetic models to describe the processes. Sediment cores were collected, and laboratory studies were performed. The result showed that nitrification and denitrification processes are absent in the water column of stabilization ponds of the Bertrix (Belgium) wastewater treatment plant. On the contrary, nitrification and denitrification rates measured on 18 cores of sediment are, respectively, in the range of 0.12?C1.56 g N-NH 4 + /m2 day and 0.1?C1.2 g N/m2 day. In order to describe nitrification and denitrification processes, two kinetic models were developed using the Monod standard equation. 相似文献
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Mahdhi A Esteban MÁ Hmila Z Bekir K Kamoun F Bakhrouf A Krifi B 《Research in veterinary science》2012,93(3):1151-1159
The probiotic properties of Bacillus strains isolated from Artemia culture and the effect of marine stress on viability and survival were investigated, as well as the changes occurring in their properties. Analyses showed that these bacteria corresponded to the genus Bacillus sp. Antagonism and adherence assays revealed that Bacillus strains have an inhibitory effect against tested pathogenic bacteria and are fairly adherent. Normal and starved cells showed different enzymatic profiles. Challenge tests performed with Artemia larvae provided evidence that the tested Bacillus strains were neither pathogenic nor toxic to the host and conferred protection for Artemia culture against pathogens. The tested strains maintained their viability and their probiotic properties during the period of study. The results suggest that the tested strains have suffered changes allowing them to survive in seawater in the absence of nutrients and outside their natural host, identifying them as potential probiotic candidates for Artemia culture. 相似文献
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The major flavanone-7-O-glycoside constituents in citrus fruit juices (naringin, hesperidin, neohesperidin, narirutin, and eriocitrin) were separated as diastereomers by multidimensional liquid chromatography. The method consisted of coupling two HPLC columns: a reversed-phase (RP(18)) column was used for the separation of flavanone glycosides, which were, then, individually switched into a carboxymethylated beta-cyclodextrin (beta-CD)-based column and resolved as the corresponding stereoisomers. The method was used for the full analysis of flavanone glycosides in fresh hand-squeezed and commercial fruit juices by combining the quantitative estimation with the diastereomeric analysis. Quantitative data were in general consistent with previously reported data in this field. CC-LC isomer analysis was carried out by coupling the beta-CD column with a mass spectrometer operated with negative ion electrospray ionization (ESI-MS). The results showed that hesperidin was present in orange juices almost exclusively as the 2S isomer, whereas narirutin had mainly the 2R configuration. In grapefruit juices (2S)-naringin prevailed with the respect to the 2R isomer, whereas the opposite was true for narirutin. Lemon juices contained eriocitrin stereoisomers in equal amount (50% each), but hesperidin was almost exclusively found as the 2S isomer. Significant differences of the diastereomeric ratios were observed between freshly squeezed juices and juices from commercial sources. 相似文献
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Chokri Hafsi Abdelbasset Lakhdhar Mokded Rabhi Ahmed Debez Chedly Abdelly Zeineb Ouerghi 《植物养料与土壤学杂志》2007,170(4):469-473
The interactive effects of salinity and potassium (K+) availability on biomass production, water status, and ionic composition were investigated in Hordeum maritimum, an annual grass growing natively on saline soils. Plants were grown for 7 weeks on Hewitt nutrient solution supplied with NaCl (0, 100, 150, 200, and 300 mM) combined with low (0.232 mM) or high (5.8 mM) K+ levels. Independent of potassium availability, dry matter of both roots and shoots decreased consistently with increasing NaCl levels in the culture medium, in association with a significant reduction of the shoot water content. This salt‐induced growth reduction did not result from a restriction of K+ nutrition, since H. maritimum expressed similar growth under both low and high K+ supply. NaCl decreased shoot K+ concentrations. This effect was more pronounced in plants grown at high K+ supply than in plants grown at low K+ supply. This result suggests that the absorption systems were strongly selective for K+, and that this selectivity was enhanced by salt. 相似文献
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Thierry Olivry† Stanley M. Dunston Robina H. Walker Zeineb Alhaidari‡ Linda Messinger§ Zhi Liu† 《Veterinary dermatology》2009,20(1):42-50
In humans with pemphigus foliaceus (PF), pathogenic autoantibodies are principally of IgG4 subclass and they cause superficial vesiculation when injected into neonatal mice. The objectives of this study were to determine the isotypes of circulating antikeratinocyte antibodies in dogs with PF, to assess whether serum antikeratinocyte antibody titres decreased during successful treatment, and to study whether such antibodies were pathogenic in passive transfers. Using indirect immunofluorescence with neonatal mouse skin substrates, circulating antikeratinocyte IgG antibodies were detected in 36 of 44 dogs with PF (82%). Serum autoantibodies belonged predominantly to IgG4 (three of 44; 80%) and IgG1 (30 of 44; 68%) subclasses. Antikeratinocyte IgG antibodies were detected in 16 of 20 normal dogs (80%), and these antibodies were IgG1 (16 of 20, 80%) but rarely IgG4 (two of 20; 10%) isotypes. In four dogs, IgG4 antikeratinocyte antibody titres decreased concomitantly to lesions nearing or reaching complete remission. In contrast, IgG or IgG1 titres remained stable or increased when lesions abated. Antikeratinocyte antibodies targeted mainly intercellular autoantigen(s) in the stratum granulosum, while in fewer dogs, such antibodies bound to cytoplasmic basal antigen(s). Intradermal injections of PF or pemphigus vulgaris (PV) IgG into neonatal mice caused subgranular or suprabasal acantholytic vesiculation without granulocyte infiltration, respectively. Similar transfers of normal dog IgG did not cause vesiculation. These observations suggest that antikeratinocyte IgG4 antibodies could be relevant to disease pathogenesis. Importantly, canine PF or PV IgG appear to be pathogenic when transferred passively into mice, causing vesiculation at epidermal levels similar to those of the natural disease. 相似文献
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Imen Tarchoune Jamel Harrathi Pier Luigi Cioni Mokhtar Lachaâl Guido Flamini Zeineb Ouerghi 《植物养料与土壤学杂志》2013,176(5):748-755
The volatile compounds emitted by living leaves of basil (Ocimum basilicum L. cv. Genovese) plants under saline conditions were investigated by means of headspace–solid phase microextraction (HS‐SPME) and gas chromatography coupled with mass spectrometry (GC–MS). Furthermore, the composition of the essential oil obtained by hydrodistillation of the leaves was studied. Plants were grown for 15 d without salt or with an equimolar concentration of Na+ in the form of Na2SO4 (25 mM) and NaCl (50 mM), after which the growth, the essential oil, and the volatile constituents of the leaves were determined. Fifty‐four components were identified belonging to different chemical classes. Under control conditions, the essential oil was rich in linalool (45.9%), 1,8‐cineole (16.7%), eugenol (10.3%), trans‐α‐bergamotene, and epi‐α‐cadinol (4.9%). The main volatiles detected in the headspace of leaves of untreated basil plants were linalool (29.8%), followed by 1,8‐cineole (19.2%), trans‐α‐bergamotene (10.0%), and eugenol (7.0%). Under saline conditions, leaf growth was more depressed by 25 mM Na2SO4 than 50 mM NaCl, and essential oil concentration increased by 22% in the NaCl, but decreased by 18% in the Na2SO4 treatment, respectively. Both salts caused some changes in the essential oil and composition of volatile compounds. Most prominent was a strong negative correlation between eugenol and methyleugenol proportions, which may indicate an enhancement of the O‐methyltransferase activity. In comparison to the essential oil, the composition of volatiles showed some variations in their emission profile under both salts, the most important was an increase of eugenol. It is therefore concluded that the decrease of eugenol occurring in basil essential oil caused by both salts could be due to the enhancement of the eugenol O‐methyltransferase activity, an enzyme that accepts eugenol as substrate, generating methyl eugenol, and also to the increase of the eugenol emission as shown by the SPME profile. 相似文献