The first record of Abutilon theophrasti (Malvaceae) in the flora of Libya
Journal ArticleA new record for Abutilon theophrasti is recorded for the first time in the flora of Libya. This widespread agricultural weed was collected from El-Hamra region (El-Qabel) in the Nafusa Mountain south of Tripoli. To facilitate further identification and future detection, a full description, habitat information, distribution map and distribution data are provided. A brief discussion about the most important threats posed by this species is presented.
Shhoob Mohamed imhmed Elahmir, MOHAMMED. H. MAHKLOUF, (05-2019), ابريطانيا: Phytotaxa, 402 (5), 259-254
Colour image blind watermarking scheme based on fast walsh hadamard transform and hessenberg decomposition
Journal ArticleColour image watermarking has become one of the most important algorithms for copyright protection. The following paper will present an innovative scheme for watermarking blind colour images using the discrete wavelet transform (DWT), fast Walsh Hadamard transform (FWHT) and the Hessenberg decomposition as its basis. First, two-level DWT followed by FWHT are used to decompose the host image’s red channel. Next, the FWHT coefficients are split into 4× 4 non-overlapping blocks. Then, each selected block is decomposed using Hessenberg decomposition, where the first row, first column element of the upper Hessenberg matrix H is quantified to embed the watermark information. Peak signalto-noise ratio, normalized cross-correlation and structural similarity index measure are used to evaluate the feasibility and the robustness. The experimental results have demonstrated that the proposed watermarking scheme is highly invisible with PSNR> 40 dB, for several watermarked colour images, with a capacity of 4096 bits and execution time of 0.7415 s. The proposed watermarking scheme is also highly resistant to both common image processing and geometrical attacks such as filtering, JPEG2000, noise adding, cropping, scaling, blurring and sharpening, and others
Omar Moftah Ibrahim Abodena, Mary Agoyi, (09-2018), Studies in Informatics and Control: Studies in Informatics and Control, 27 (3), 339-348
Contribution of transition 2 and stabilization processes to 3 speciation is a function of the ancestral trait state and selective 4 environment in Hakea
مقال في مجلة علميةCurrently the origin and trajectories of novel traits are emphasised in evolutionary studies, the
role of stabilization is neglected, and interpretations are often post hoc rather than as
hypothesised responses to stated agents of selection. Here we evaluated the impact of
changing environmental conditions on trait evolution and stabilization and their relative
contribution to diversification in a prominent Australian genus, Hakea (Proteaceae). We
assembled a time-based phylogeny for Hakea, reconstructed its ancestral traits for six
attributes and determined their evolutionary trajectories in response to the advent or
increasing presence of fire, seasonality, aridity, nectar-feeding birds and (in)vertebrate
herbivores/granivores. The ancestral Hakea arose 18 million years ago (Ma) and was broad
leaved, non-spinescent, insect-pollinated, had medium-sized, serotinous fruits and resprouted
after fire. Of the 190 diversification events that yielded the 82 extant species analysed, 8−50%
involved evolution, stabilization or re-evolution (reversal) of individual novel traits.
شهوب محممد أمحمد الأحمر، Byron B. Lamont، (10-2017)، استراليا: تم اختياره bioRxiv Journal، 1 (10)، 1-33
Functional and genetic evidence that nucleoside transport is highly conserved in Leishmania species: Implications for pyrimidine-based chemotherapy
Journal ArticleLeishmania pyrimidine salvage is replete with opportunities for therapeutic intervention with enzyme inhibitors or antimetabolites. Their uptake into cells depends upon specific transporters; therefore it is essential to establish whether various Leishmania species possess similar pyrimidine transporters capable of drug uptake. Here, we report a comprehensive characterization of pyrimidine transport in L. major and L. mexicana. In both species, two transporters for uridine/adenosine were detected, one of which also transported uracil and the antimetabolites 5-fluoruracil (5-FU) and 5F,2'deoxyuridine (5F,2'dUrd), and was designated uridine-uracil transporter 1 (UUT1); the other transporter mediated uptake of adenosine, uridine, 5F,2'dUrd and thymidine and was designated Nucleoside Transporter 1 (NT1). To verify the reported L. donovani model of two NT1-like genes encoding uridine/adenosine transporters, and an NT2 gene encoding an inosine transporter, we cloned the corresponding L. major and L. mexicana genes, expressing each in T. brucei. Consistent with the L. donovani reports, the NT1-like genes of either species mediated the adenosine-sensitive uptake of [3H]-uridine but not of [3H]-inosine. Conversely, the NT2-like genes mediated uptake of [3H]-inosine but not [3H]-uridine. Among pyrimidine antimetabolites tested, 5-FU and 5F,2'dUrd were the most effective antileishmanials; resistance to both analogs was induced in L. major and L. mexicana. In each case it was found that the resistant cells had lost the transport capacity for the inducing drug. Metabolomics analysis found that the mechanism of action of 5-FU and 5F-2'dUrd was similar in both Leishmania species, with major changes in deoxynucleotide metabolism. We conclude that the pyrimidine salvage system is highly conserved in Leishmania species - essential information for the development of pyrimidine-based chemotherapy.
Juma Ahmed Mohamed Ali, (08-2017), Netherlands: International journal for parasitology. Drugs and drug resistance, 2 (7), 206-226
Bagged textural and color features for melanoma skin cancer detection in dermoscopic and standard images.
Journal ArticleAbstract—Early detection of malignant melanoma skin cancer is crucial for treating the disease and saving lives. Many computerized techniques have been reported in the literature to diagnose and classify the disease with satisfactory skin cancer detection performance. However, reducing the false detection rate is still challenging and preoccupying because false positives trigger the alarm and require intervention by an expert pathologist for further examination and screening. In this paper, an automatic skin cancer diagno- sis system that combines different textural and color features is proposed. New textural and color features are used in a bag-of-features approach for efficient and accurate detection. We particularly claim that the Histogram of Gradients (HG) and the Histogram of Lines (HL) are more suitable for the analysis and clas- sification of dermoscopic and standard skin images than the conventional Histogram of Oriented Gradient (HOG) and the Histogram of Oriented Lines (HOL), respectively. The HG and HL are bagged separately us- ing a codebook for each and then combined with other bagged color vector angles and Zernike moments to exploit the color information. The overall system has been assessed through intensive experiments using different classifiers on a dermoscopic image dataset and another standard dataset. Experimental results have shown the superiority of the proposed system over state-of-the-art techniques.
Naser Alfed, Fouad Khelifi, (08-2017), Elsevier: Expert Systems With Applications, Elsevier, 90 (90), 101-110
Hybrid technique for robust image watermarking using discrete time fourier transform
Conference paperThe current paper proposes a novel scheme for non-blind watermarking of images, making use of discrete wavelet transform (DWT), discrete time Fourier transform (DTFT), as well as singular value decomposition, or SVD. During the process of embedding, 1-level DWT is used to decompose the host image into its various frequency sub-bands. After this, the high-frequency sub band receives an application of DTFT. This is followed then by SVD, after which the watermark becomes embedded into the now-transformed host image's singular matrix. Then, the inverses of 1-level DWT, DTFT and SVD are applied in order to obtain a watermarked final image. This paper evaluates the performance of the proposed method of watermarking against a number of attacks, including sharpening, salt and pepper noise, AWGN, gamma correction, histogram equalisation, flipping and cropping. Results obtained during experiments have found that the scheme as proposed does provide high levels of robustness and imperceptibility against various signal processing attacks.
Omar Moftah Ibrahim Abodena, Erbug Celebi, Mary Agoyi, (05-2017), 2017 25th IEEE Signal Processing and Communications Applications Conference: IEEE, 1-4
The Impact of Water and Some Salt Solutions on Some Properties of Hydrophilic Acrylamide Copolymeric Hydrogels
Journal ArticleAbstract-A series of polyelectrolyte hydrogels ranging from 92-98wt% were synthesized by copolymerization of acrylamide,
AAM with 2-acrylamido-2-methyl propane sulphonic acid, AMPS using 0.001g APS as initiator in the presence of 30wt% H2O
and 1.0wt% ethylene glycol dimethacrylate,EDMA as cross-linking agent. The final copolymers was obtained in the form of
glassy and transparent roads at room temperature, these roads were soaked in water for two days to remove unreacted
monomers. The swelling behavior of the hydrogels was studied in distilled water and salt solutions of 1.5 mol/l each of NaCl
and KCl. The Swelling in water shows decreasing values of q, LE, Ø1, EWC% and increasing polymer volume fraction, Ø2 by
increasing acrylamide, due to increasing hydrophobicity and decreasing the hydrophilicity. The swelling in salt solutions
shows a decreasing in the values of ESSNa%, WCNa%, SCNa%, ESSK%, WCK% and SCK% by increasing acrylamid
monomer in the feed due to increasing the hydrophobicity and decreasing the ionized ionic groups (SO3H). The increasing
values of ESSNa%, WCNa% and SCNa% compared with the values of ESSK%, WCK% and SCK% respectively, is due to
the higher charge density of sodium ion than that of potassium ion.
Shhoob Mohamed imhmed Elahmir, Abdurhman A.Abuabdalla Khalifa1, (01-2017), ابريطانيا: MAYFEB Journal of Materials Science, 1 (1), 7-16
Small-seeded Hakea species tolerate cotyledon loss better than large-seeded congeners
Journal ArticleSix Hakea species varying greatly in seed size were selected for cotyledon damage experiments. The
growth of seedlings with cotyledons partially or completely removed was monitored over 90 days. All
seedlings perished by the fifth week when both cotyledons were removed irrespective of seed size.
Partial removal of cotyledons caused a significant delay in the emergence of the first leaf, and reduction
in root and shoot growth of the large-seeded species. The growth of seedlings of small-seeded species
was less impacted by cotyledon damage. The rate of survival, root and shoot lengths and dry biomass
of the seedlings were determined after 90 days. When seedlings were treated with balanced nutrient
solutions following removal of the cotyledons, survival was 95–98%, but 0% when supplied with
nutrient solutions lacking N or P or with water only. The addition of a balanced nutrient solution failed
to restore complete growth of any species, but the rate of root elongation for the small-seeded species
was maintained. Cotyledons provide nutrients to support early growth of Hakea seedlings, but other
physiological roles for the cotyledons are also implicated. In conclusion, small-seeded Hakea species can
tolerate cotyledons loss better than large-seeded species.
Shhoob Mohamed imhmed Elahmir, Byron B. Lamont, Tianhua He, (01-2017), استراليا: Scientific Reports, 7 (1), 1-9
Improving a Bag of Words Approach for Skin Cancer Detection in Dermoscopic Images.
Conference paperAbstract—With a rapidly increasing incidence of melanoma
skin cancer, there is a need for decision support systems to
detect it in its early stages, which would lead to better decisions
in treating it successfully. However, developing such systems is
still a challenging task for researchers. Several Computer Aided-
Diagnosis (CAD) systems have been proposed in the last two
decades to increase the accuracy of melanoma detection. Image
feature extraction is a critical step in differentiating between
melanoma and normal skin lesions. In this paper, we propose
to improve a bag-of-words approach by combining features
consisting of the color histogram and first order moments with the
Histogram of Oriented Gradients (HOG). Experimental results
show that the proposed technique significantly improves the
detection accuracy, with an average sensitivity of 91% and
specificity of 85%. The proposed system was validated on a
dataset of 200 medically annotated images (40 melanomas and
160 non-melanomas) obtained from the database of the Hospital
Pedro Hispano.
Naser Alfed, Fouad Khelifi, Ahmed Bouridane, (04-2016), Saint Julian's, Malta: IEEE. DOI: 10.1109/CoDIT38383.2016, 24-27
Pigment network-based skin cancer detection.
Conference paperAbstract— Diagnosing skin cancer in its early stages is a challenging task for dermatologists given the fact that the chance for a patient’s survival is higher and hence the process of analyzing skin images and making decisions should be time efficient. Therefore, diagnosing the disease using automated and computerized systems has nowadays become essential. This paper proposes an efficient system for skin cancer detection on dermoscopic images. It has been shown that the statistical characteristics of the pigment network, extracted from the dermoscopic image, could be used as efficient discriminating features for cancer detection. The proposed system has been assessed on a dataset of 200 dermoscopic images of the ‘Hospital Pedro Hispano’ [1] and the results of cross-validation have shown high detection accuracy.
Naser Alfed, Fouad Khelifi, Ahmed Bouridane, (08-2015), Milan, Italy: IEEE (EMBC), 7214-7217