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Ines Ben Chobba Amine Elleuch Imen Ayadi Lamia Khannous Ahmed Namsi Frederique Cerqueira Noureddine Drira Néji Gharsallah Tatiana Vallaeys 《Journal of Zhejiang University. Science. B》2013,14(12):1084-1099
Endophytic flora plays a vital role in the colonization and survival of host plants, especially in harsh environments, such as arid regions. This flora may, however, contain pathogenic species responsible for various troublesome host diseases. The present study is aimed at investigating the diversity of both cultivable and non-cultivable endophytic fungal floras in the internal tissues (roots and leaves) of Tunisian date palm trees (Phoenix dactylifera). Accordingly, 13 isolates from both root and leaf samples, exhibiting distinct colony morphology, were selected from potato dextrose agar (PDA) medium and identified by a sequence match search wherein their 18S–28S internal transcribed spacer (ITS) sequences were compared to those available in public databases. These findings revealed that the cultivable root and leaf isolates fell into two groups, namely Nectriaceae and Pleosporaceae. Additionally, total DNA from palm roots and leaves was further extracted and ITS fragments were amplified. Restriction fragment length polymorphism (RFLP) analysis of the ITS from 200 fungal clones (leaves: 100; roots: 100) using HaeIII restriction enzyme revealed 13 distinct patterns that were further sequenced and led to the identification of Alternaria, Cladosporium, Davidiella (Cladosporium teleomorph), Pythium, Curvularia, and uncharacterized fungal endophytes. Both approaches confirmed that while the roots were predominantly colonized by Fusaria (members of the Nectriaceae family), the leaves were essentially colonized by Alternaria (members of the Pleosporaceae family). Overall, the findings of the present study constitute, to the authors’ knowledge, the first extensive report on the diversity of endophytic fungal flora associated with date palm trees (P. dactylifera). 相似文献
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Samer Alhawari Louay Karadsheh Amine Nehari Talet Ebrahim Mansour 《International Journal of Information Management》2012
The purpose of this paper is to explore the field of Risk Management (RM) in relation with Knowledge Management (KM). It attempts to present a conceptual framework, called Knowledge-Based Risk Management (KBRM) that employs KM processes to improve its effectiveness and increase the probability of success in innovative Information Technology (IT) projects. It addresses initiatives towards employing KM processes in RM processes by reviewing, interpreting the related and relevant literature and sheds light on integration with RM in the IT project. 相似文献
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The aim of this study was to explore the opinions, perceptions and evaluations of students about their experiences with a question–answer system used on mobile devices in a lecture-based course. Basic qualitative research method was employed in this study to understand how students made sense of their experiences during the instruction. The participants of the study were 25 of 42 students enrolled in a Computer Hardware course, who were interviewed in five sessions of focus-groups. Data analysis was done based on the six steps of inductive analysis. The results showed that students mostly ascribed the meaning of their engagement to the observable behaviors about academic challenge. Concerning inhibiting factors for participating in a lecture, they stressed the constraints of lecture method. As inhibiting factors for asking questions, they mostly stated shyness as a reason. The results of the research were discussed reflectively to investigate the constructed meanings of participants about the context and to make suggestions for further studies. 相似文献
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Fatim Zahra Ait Bella Mohammed El Rhabi Abdelilah Hakim Amine Laghrib 《Journal of The Franklin Institute》2018,355(16):8225-8244
In this paper, we investigate two new reflectance and illumination decomposition models based on a nonlocal partial differential equation (PDE) applied to text images. Taking into consideration the higher regularity level of the illumination compared to the reflectance, we propose a nonlocal PDE which deals with repetitive structures and textures that characterize the text image much better compared to the classical local PDEs. The aim of this approach is to use the repetitive features of the reflectance to efficiently extract it from the non-uniform illumination. This idea is motivated by extending the range of application of the nonlocal operators to such a problem. Numerical experiments on both grayscale and color text images show the performance and strength of the proposed nonlocal PDE. 相似文献
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Amine Hadj Taieb Manel Hammami Slah Msahli Faouzi Sakli 《The International Journal of Art & Design Education》2010,29(3):313-320
Human health is affected by pollution caused by toxic chemical substances, particularly vulnerable groups like children. So how can we make things better for people and for the environment through the textile products we design? By thinking about the environment when designing, choosing and using environmental‐friendly technology, we can play an important role in building a better world for the future. If we are going to live in a sustainable way, the technology and materials that we use have to be sustainable. This article provides an insight into how textile product design can provide a better future. It describes the design of ecological textile messages for sensitising and educating children. In the long term, such design may help towards ensuring a better quality of life for everyone, now and in the future. In this survey, the design of the sensitising messages was done using ecological techniques and raw materials to accentuate the message and took into account the intellectual and psychological level of children. All of the raw materials, process and plant dyes used were analysed from an environmental perspective. 相似文献
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Amine Laghrib Aissam Hadri Abdelilah Hakim 《Journal of The Franklin Institute》2019,356(11):5834-5857
The multiframe image super-resolution (SR) has appeal great care due to its relevant practical applications. Since the SR methods are always considered as ill-posed problems, great interest is therefore investigated to reconstruct an image with less artefacts. In this paper, we propose a high-order partial differential equation (PDE) that preserve singularities and edge continuities while smoothing. This PDE is based on anisotropic diffusion behavior by adding some constraints to the Weickert coherence enhancing diffusion tensor in order to control the diffusion process near edges and avoids tiny corners destruction. In fact, this PDE combine between the diffusion process of Perona–Malik in the flat regions and the anisotropic diffusion of the Weickert model near strong edges. Moreover, the introduction of the high-order derivatives reduces unwanted artifacts such as staircasing. The given experimental results show the effectiveness of the proposed PDE compared to some competitive methods in both visually and quantitatively. 相似文献
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Classical unequal erasure protection schemes split data to be protected into classes which are encoded independently. The unequal protection scheme presented in this paper is based on an erasure code which encodes all the data together according to the existing dependencies. A simple algorithm generates dynamically the generator matrix of the erasure code according to the packets streams structure, i.e., the dependencies between the packets, and the rate of the code. This proposed erasure code was applied to a packetized MPEG4 stream transmitted over a packet erasure channel and compared with other classical protection schemes in terms of PSNR and MOS. It is shown that the proposed code allows keeping a high video quality-level in a larger packet loss rate range than the other protection schemes. 相似文献
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