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Search Results: 1 - 10 of 9518 matches for " Hanaa Ibrahim Mohammed "
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Genetic Diversity Analysis of Forty Pearl Millet (Pennisetum glaucum (L.) R. Br) Accessions from Sudan Using Agronomical Descriptors and DNA Molecular Markers  [PDF]
Hanaa Ibrahim Mohammed, Nada Babiker Hamza
Advances in Bioscience and Biotechnology (ABB) , 2018, DOI: 10.4236/abb.2018.97021
Abstract: Morphological descriptors and Random Amplification of Polymorphic DNA (RAPD) technique were used to assess the genetic variation among and within forty Pennesitum glaucum accessions from Sudan. Accessions were collected from 30 villages representing Darfur, North Kordofan, South Kordofan, and Blue Nile states. 64 amplified fragments were distinguished using ten primers.? 63 bands were polymorphic among the forty accessions with an average of 6.3 polymorphic bands per primer. Low level of genetic similarity was observed (4% - 43%). The PhiPT (analogue of FST fixation index) value for genetic variability obtained over the four regions was 0.169 with high significance (P = 0.01). AMOVA analysis showed higher variance components within regions (80%) than among regions (20%). The two dendrograms obtained by Random Amplification of Polymorphic DNA (RAPD) data; and morphological data based on 26 descriptors did not fit together. PCA (Principal coordinate’s analysis) showed geographic structuring of pearl millet according to its growing regions in Sudan.
Screening for Psychopathology Using the Three Factors Model of the Structure of Psychopathology: A Modified Form of GAIN Short Screener  [PDF]
Ibrahim A. Kira, Hanaa Shuwiekh, Justyna Kucharska
Psychology (PSYCH) , 2017, DOI: 10.4236/psych.2017.814152
Abstract: The goal of this paper is to develop a valid and reliable screening tool for mental health that is based on empirically and conceptually valid structure of psychopathology. Recently several studies of the structure of psychopathology found a general factor and three specific factors: internalizing, externalizing and thought disorder. We adapted the previously validated GAIN Short Screener to include the thought disorder that was not included in its original version and further developed its internalizing subscale. We conducted an exploratory and confirmatory factor analysis of the new adapted measure and produced 20 items screening tool that parsimoniously represents the three factors. The adapted screener and its subscales were found to have good reliability, stability, structural validity in two Egyptian and Polish samples. Additionally, all its subscales significantly correlated with different trauma types and with cumulative trauma, and negatively with self-esteem. The new adapted measure is the first that is based on robust scientific evidence of the structure of psychopathology and can be used in a broad scope of settings.
Gender Discrimination (GD): A Conceptual Trauma-Based Framework for GD and the Development of Gender Discrimination Inventory  [PDF]
Ibrahim A. Kira, Shuwiekh Hanaa, Mireille Bujold-Bugeaud
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.616201
Abstract: A comprehensive plausible conceptual model of Gender Discrimination (GD) and accurate measures of its components are lacking. Current study developed a conceptual model of GD derived from the development-based trauma framework (DBT) and constructed measures for GD and its coping dynamics and tested them in two studies on Egyptian female college students. The first study conducted on a sample of 150, and the second study conducted on 311 participants. Exploratory factor analysis in the first sample, and confirmatory factor analysis in the second sample confirmed three components of GD (GD by parents attitudes, GD by parents behavior, and GD by society), and three components of GD coping dynamics (gender identity conflict (GIC), internalized GD, and GD resistance). GD measures are found to have generally good reliability and stability, good construct, and predictive validity. Using path analysis in the second study, GD, controlling for other life traumas, predicted a significant decrease in self-esteem and self-efficacy and increase in existential anxiety, which mediated its effects on PTSD and complex PTSD. GIC and internalized GD further moderated GD effects. GD inventory that includes 6 measures with 33 items can be a parsimonious tool for future research on GD.
A Conceptual Model and Measurement of Identity-Based, Existential Annihilation Anxieties (EAA)  [PDF]
Ibrahim A. Kira, Thomas Templin, Linda Lewandowski, Hanaa Shuwiekh
Psychology (PSYCH) , 2018, DOI: 10.4236/psych.2018.96080
Abstract: Existential (annihilation) anxiety (EAA) and its significant role in PTSD, complex PTSD and mental and physical health, were a long ignored variable in the mainstream clinical science. Further collective EAA is one of the important dimensions missing in the theory and measurement of EAA. The study evaluated the psychometric properties of an existing measure of existential annihilation scale (EAA) (Kira et al., 2012b), that had previously developed based on an integrative framework of identity-based existential annihilation anxiety (EAA) that include most of the personal and collective dimensions of EAA. We reanalyzed the data in seven studies that utilized the measure, conducting exploratory and confirmatory factor analysis for the pooled data (N = 2436), as well as path analysis with EAA as a mediator of the effects of cumulative stress and trauma on PTSD. We conducted Multigroup invariance to test the invariance of the measurement model as well as the predictive structural model across groups. The short measure found to have good internal consistency and test-retest stability, as well as construct, convergent, divergent and predictive validity and is strongly invariant across the main groups. As hypothesized, by the integrated model of EAA, EAA fully mediated the effects of cumulative trauma on PTSD. The results confirm at least in part the validity and utility of the integrative conceptual framework. Further development of the measurement model in future studies was proposed to include fear of death that was not included in the evaluated measure and is one of the components of integrated framework of EAA. The importance of integrating EAA in the mainstream clinical science and intervention was discussed.
Is the “Almost Perfect Scale” Almost Perfect? The Psychometric Properties of the Arabic Version of APS-R and Its Short Form  [PDF]
Ibrahim Kira, Hanaa Shuwiekh, Kenneth Rice, Jeffrey Ashby
Psychology (PSYCH) , 2018, DOI: 10.4236/psych.2018.97109
Abstract: The goal was to evaluate the construct and predictive validity of the Arabic version of APS-R and check its invariance across genders and the English version supplied by one of the measure authors. We used its translated Arabic version, and measures of PTSD, complex PTSD (CTD), depression, and existential annihilation anxiety (AA), in a sample of 620 students from two Egyptian Universities. We conducted exploratory and confirmatory factor analysis (CFA) to test the APS-R’s construct validity and zero-order correlation, curve estimation regression to test its predictive validity, and Multigroup invariance analysis to check its invariance between languages and genders. The three-factor model did not fit well which made its structural validity questionable. However, the model fitted well for each dimension separately. The results indicated that striving for standards and order, and self-discrepancy are distinct measures, and each has good construct and predictive validity. Order and standards predicted linearly and non-linearly lower PTSD, CTD (post-cumulative trauma disorders), depression, and AA. Self-discrepancy predicted linearly and non-linearly higher depression, PTSD, CTD, and AA. The non-linear models accounted for more variance than the linear models. While the measures were strongly invariant across genders, they were partially invariant across the English and Arabic samples.
The Integrated Structural and Measurement Models of Existential Annihilation Anxieties (EAA) and Their Potential Contribution to Clinical Science: Two Studies on Western and Non-Western Samples  [PDF]
Ibrahim Kira, Hanaa Shuwiekh, Justyna Kucharska, Amthal Al-Huwailah
Psychology (PSYCH) , 2019, DOI: 10.4236/psych.2019.104031
Abstract: Current study integrated the existential annihilation anxieties (EAA) models and identified four EAA types: psychic, collective, status, and physical. Based on this conceptual framework, the authors developed a scale to measure the four types and assessed the scale’s construct and predictive validity, reliability and stability in two Western (UK, N = 178) and non-Western (Egypt, N = 490) samples. The study measured trauma types, PTSD, psychopathology, depression, self-esteem, will to exist and other related variables. Exploratory and confirmatory factor analysis confirmed the four-factor structure of the construct that was strictly invariant across groups in both samples. EAA and its four subscales were highly correlated with psychopathology, depression, and PTSD, and negatively correlated with “will to exist” and self-esteem in both samples. Path analysis and PROCESS macro indicated that EAA had strong direct effects, and mediated the effects of cumulative trauma on psychopathology. While personal identity trauma predicted psychic EAA, collective identity traumas predicted collective EAA, and status identity trauma predicted status EAA, survival trauma did not predict physical death EAA in either sample. Curve estimation clarified the non-linear dynamics involved in EAA’s types’ intersections and the discrepancy in physical EAA results. We discussed the inclusion of EAA in clinical practice and in the future development of intervention and prevention strategies.
Chemical and Biological Comparative in Vitro Studies of Cinnamon Bark and Lemon Peel Essential Oils  [PDF]
Eman M. Elgendy, Hoda S. Ibrahim, Hanaa F. Elmeherry, Amal G. Sedki, Faten U. Mekhemer
Food and Nutrition Sciences (FNS) , 2017, DOI: 10.4236/fns.2017.81008
Abstract: Cinnamon and lemon are the oldest plants which possess a rising popularity due to their therapeutic potential from centuries. Cinnamomum zeylanicum and lemon (Citrus lemon L.) have been subjected to extensive research. Their essential oils were extracted by steam distillation from selected plants and their chemical compositions were determined by the GC-MS system. Cinnamon and lemon essential oils were examined for antioxidant activity by ABTS method which showed the ability to inhibit lipid per-oxidation. On the other hand, in antimicrobial investigations, cinnamon and lemon essential oils have inhibitory effect against Gram positive bacteria (Staphylococcus aureus) and Gram negative bacteria (Escherichia coli) using Muller Hinton agar medium. The essential oils of cinnamon and lemon showed antifungal effects which were tested against (Candida albicans). The volatile oil of cinnamon bark has been found to be highly effective against all the tested bacteria and fungi. However, lemon peel essential oil has shown medium inhibition for Gram positive bacteria (Staphylococcus aureus). On the other hand, the cytotoxic activities of the essential oils were tested on hepatocellular carcinoma and colorectal carcinoma. Essential oils have shown good activities on the cell lines. Essential oil of cinnamon showed more inhibition rate than essential oil of lemon. This study reported the importance of both cinnamon and lemon volatile oils and recommends that cinnamon and lemon can be used as an active therapy for humans.
Surgical Treatment of Giant Cavernous Hepatic Haemangiomas  [PDF]
Ibrahim Abdelkader Salama, Mohammed Hussein Abdullah, Mohammed Houseni
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.38081
Abstract: Background: Haemangiomas are the most common benign liver tumors. Treatment is indicated for symptomatic tumors, rapid increase in size, rupture or doubt in diagnosis. Objective: Evaluation the efficacy of surgical treatment of giant cavernous hepatic haemangioma in tertiary hepatobiliary center. Patients and Methods: Retrospective study of 34 patients with giant hepatic haemangioma operated upon. The diagnosis was proved preoperatively in 27 patients and confirmed by histopathology postoperatively in all patients. The indication of surgery was abdominal pain with large sizes tumors, rapid growth, and spontaneous rupture with haemoperitoneum. Surgical treatment either liver resection or living liver transplantation. Results: 23 cases (67.6%) were females & 11 cases (32.4%) were males, median age 38.8 years. Haemangiomas located in right lobe in 19 patients (55.9%), left lobe in 12 patients (35.4%) in both lobe in 2 patients (5.8%), scattered all over both lobe in one patient (2.9%), solitary in 27 cases (79.4%) and multiple in 7 patients (20.6%). The diameter was 8 - 27 cm, mean 18.6 cm in diameter. 33 patients had liver resection (29 elective resection and 4 emergent resection for rupture). One patient had haemangioma irresectable; the living liver transplant was performed. No mortality during 18 months follow up and complication occurred in 8 patients out of 34 patients. Conclusion: Hepatic resection is an effective treatment option for giant cavernous hepatic haemangioma, in selected patient living related liver transplantation may be the only therapeutic option.
Interference Mitigation MAC Protocol for Cognitive Radio Networks  [PDF]
Nasir Faruk, Maaruf Ali, Mohammed Ibrahim Gumel
Wireless Engineering and Technology (WET) , 2012, DOI: 10.4236/wet.2012.32010
Abstract: The growing demand for wireless services coupled with the limited availability of suitable electromagnetic spectrum is increasing the need for more efficient RF spectrum utilization. Spectrum allocated to TV operators can potentially be shared by wireless data services, either when the primary service is switched off or by exploiting spatial reuse opportunities. This paper describes a dynamic spectrum access scheme for use in the TV bands which uses cognitive radio techniques to determine the spectrum availability. The approach allows secondary users (SU) to operate in the presence of the primary users (PU) and the OPNET simulation and modelling software has been used to model the performance of the scheme. An analysis of the results shows that the proposed scheme protects the primary users from harmful interference from the secondary users. In comparison with the 802.11 MAC protocol, the scheme improves spectrum utilization by about 27% while limiting the interference imposed on the primary receiver.
A Water-Saving Technique Using Embedded System  [PDF]
Ibrahim Mohammed Bader, Adel Hammad Abusitta
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.41021
Abstract:

A method for water-saving is presented in this paper. The proposed method is based on an electro mechanical approach and embedded system that is described mathematically. It describes a solution for water-saving in buildings by giving the ability to ensure that treasurer of water will never be empty before the maximum time T that the owner gives to the treasurer when it is filled with water. The rate of water pumped is altered based on water consumed at tr. Where tr is a random number generated by system. Simulation results in the last section shows that the method can save the water with different maximum time decided by the owner.

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