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Search Results: 1 - 10 of 173 matches for " Fethi;Gazzah "
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Epistasis and genotype-by-environment interaction of grain protein content in durum wheat
Bnejdi, Fethi;Gazzah, Mohamed El;
Genetics and Molecular Biology , 2010, DOI: 10.1590/S1415-47572010000100021
Abstract: parental, f1, f2, bc1 and bc2 generations of four crosses involving four cultivars of durum wheat (triticum durum desf.) were evaluated at two sites in tunisia. a three-parameter model was found inadequate for all cases except crosses chili x cocorit 71 at site sidi thabet and inrat 69 x karim at both sites. in most cases a digenic epistatic model was sufficient to explain variation in generation means. dominance effects (h) and additive x additive epistasis (i) (when significant) were more important than additive (d) effects and other epistatic components. considering the genotype-by-environment interaction, the non-interactive model (m, d, h, e) was found adequate. additive variance was higher than environmental variance in three crosses at both sites. the estimated values of narrow-sense heritability were dependent upon the cross and the sites and were 0%-85%. the results indicate that appropriate choice of environment and selection in later generations would increase grain protein content in durum wheat.
Relationship between leaf stages and epistasis for resistance to Stagonospora nodorum in durum wheat
Bnejdi, Fethi;Saadoun, Mourad;Naouari, Mouna;El Gazzah, Mohamed;
Genetics and Molecular Biology , 2012, DOI: 10.1590/S1415-47572012005000033
Abstract: ten varieties and eight generations (2f1, 2f2, 2b1 and 2b2) of durum wheat derived from two crosses were evaluated for resistance to natural infection by stagonospora nodorum blotch (snb) at the 2-3 and 6-7 leaf stages at two sites over two years. there were significant differences in the incidence of snb between leaf stages in most of the wheat varieties, with resistance being most evident at the 6-7 leaf stage. separate analyses of the mean values for each generation showed that the genetic mechanism of defense against the pathogen depended upon the leaf stage. at the 2-3 leaf stage, only additive and dominance effects were implicated in the control of snb for the two crosses at the two sites and for the two replications. for the 6-7 leaf stage, inheritance was more complicated and an epistatic effect was involved. narrow-sense heritability values (range: 0.63-0.67) were consistent between crosses and leaf stages. these findings indicate a lack of resistance to snb at the 2-3 leaf stage whereas resistance was observed at the 6-7 leaf stage and involved the genetic mechanisms of plant defense such as epistasis.
Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianae
Bnejdi, Fethi;Saadoun, Morad;Allagui, Mohamed Bechir;Hanbury, Colin;El Gazzah, Mohamed;
Genetics and Molecular Biology , 2010, DOI: 10.1590/S1415-47572010005000027
Abstract: this study evaluated the types of gene action governing the inheritance of resistance to phytophthora nicotianae necrosis in populations derived from two crosses involving two susceptible (beldi and nabeul ii) and one resistant (cm334) cultivars of pepper (capsicum annuum l.). populations, composed of pr, ps, f1,f2,bc1pr, and bc1ps generations, were inoculated with six p. nicotianae isolates. generation means analysis indicated that an additive-dominance model was appropriate for p. nicotianae isolates pnko1,pnko2 and pnkr1, which showed low aggressiveness in the two crosses. for the more aggressive isolates pnbz1,pnbz2 and pnkr2, epistasis was an integral component of resistance in the two crosses. the presence of epistasis in the resistance of pepper to p. nicotianae was dependent on the level of aggressiveness of the isolates. selection in pepper with less aggressive isolates was efficient, but not with more aggressive isolates; on the other hand, selection with more aggressive isolates was more stable. the minimum number of genes controlling resistance was estimated at up to 2.71. in the majority of cases, the additive variance was significant and greater than the environmental and dominance variance.
Complexity Results for Wireless Sensor Network Scheduling  [PDF]
Fethi Jarray
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.24045
Abstract: We study the problem of scheduling multi sensors to visit and observe a group of sites at discrete time points over a planning horizon of given length. We show that scheduling under a given number of visits for each site and in each period is an NP-complete problem by providing equivalence with a problem in discrete tomography. We also give a polynomial time algorithm to schedule the sensors under a given number of visits in each period.
Multiplication and Translation Operators on the Fock Spaces for the q-Modified Bessel Function  [PDF]
Fethi Soltani
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.14039
Abstract: We study the multiplication operator M by z2 and the q-Bessel operator Δq,αon a Hilbert spaces Fq,α of entire functions on the disk D( o, ) , 0<q<1 ; and we prove that these operators are adjoint-operators and continuous from Fq,α into itself. Next, we study a generalized translation operators on Fq,α .
Effect of Annealing on the Structural and Optical Properties of CuIn1–xAlxS2 thin Films  [PDF]
Fethi Smaili
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.29164
Abstract: The effects of annealing of CuIn1–xAlxS2thin films for different temperature, which were grown by thermal evaporation, were investigated through X-ray diffraction (XRD), energy dispersive X-ray analysis (EDS) and optical absorption measurements. Post growth was used to modify the structural and optical properties of the CIAS thin films. Then it realized in three different temperatures 250, 300 and 400℃. It is found that significant difference of the transparent films in function of annealing temperature. The FWHM in the X-ray diffraction pattern is found to decrease with an increase in annealing temperature indicating that the crystalline nature of the CIAS improves with increase in annealing temperature. The position of the (112) peak and other peaks in the X-ray diffraction pattern has been observed to shift to higher values of 2θ with the increase of gallium concentration. We demonstrate a significant enhancement of the interdiffusion in the dot thin film.
Toeplitz and Translation Operators on the q-Fock Spaces  [PDF]
Fethi Soltani
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.16059
Abstract: In this work, we introduce a class of Hilbert spaces Fq of entire functions on the disk , , with reproducing kernel given by the q-exponential function eq(z); and we prove some properties concerning Toeplitz operators on this space. The definition and properties of the space extend naturally those of the well-known classical Fock space. Next, we study the multiplication operator Dq by and the q-Derivative operator on the Fock space Fq ; and we prove that these operators are adjoint-operators and continuous from this space into itself. Lastly, we study a generalized translation operators and a Weyl commutation relations on Fq .
Fock Spaces for the q-Dunkl Kernel  [PDF]
Fethi Soltani
Advances in Pure Mathematics (APM) , 2012, DOI: 10.4236/apm.2012.23023
Abstract: In this work, we introduce a class of Hilbert spaces of entire functions on the disk , 0<q<1 , with reproducing kernel given by the q-Dunkl kernel . The definition and properties of the space extend naturally those of the well-known classical Fock space. Next, we study the multiplication operator Q by z and the q-Dunkl operator on the Fock space ; and we prove that these operators are adjoint-operators and continuous from this space into itself.
Discourse and Intercultural Academic Rhetoric  [PDF]
Fethi Helal
Open Journal of Modern Linguistics (OJML) , 2013, DOI: 10.4236/ojml.2013.32020
Abstract: This paper is critically concerned with the recent attempts in contrastive rhetoric (CR) to interpret the linguistic and rhetorical differences found in the academic discourses produced by Anglophone and nonAnglophone academic and research writers. Framing this critique within a discourse view of language, culture and communication, this paper points to the need to go beyond such a priori, static, and too often vague concepts as language and culture as explanatory variables in intercultural (academic) rhetoric. Moreover, using data that examined the use of English in lingua franca contexts, the paper urges researchers in CR to consider the differences and misunderstandings arising from a history of socialization of academics to different discourse communities, varying assumptions of what constitutes appropriate academic genres, as well as the identities and meanings that are co-constructed in concrete and situated rhetorical action. It is believed that such a perspective on intercultural academic communication will not only help move the CR agenda forward, but will also lead to a better understanding of communicative and intercultural competence, and dialogue with the cultural academic “other”.
ASIP Solution for Implementation of H.264 Multi Resolution Motion Estimation  [PDF]
Fethi Tlili, Akram Ghorbel
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.35060
Abstract: Motion estimation is the most important module in H.264 video encoding algorithm since it offer the best compression ratio compared to intra prediction and entropy encoding. However, using the allowed features for inter prediction such as variable block size matching, multi-reference frames and fractional pel search needs a lot of computation cycles. For this purpose, we propose in this paper an Application Specific Instruction-set Processor (ASIP) solution for implementing inter prediction. An exhaustive full and fractional pel combined with variable block size matching search are used. The solution, implemented in FPGA, offers both performance and flexibility to the user to reconfigure the search algorithm.
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