الغامدي، حنان مبارك فطيس

Aims of the Study 1- Surveying of the wild plants as a general and wild medicinal plants as a particular distributed in the study area. 2- Analyzing the vegetation of the important sites (Hada and Shafa) in Taif as well as Bisha regions in terms of species composition, diversity, abundance and behavior of the common medicinal species. 3- Recognizing the rarity forms of the recoded species in the study area. 4- Depicting the prevailing plant communities and assessing the role of the environmental conditions and human impacts that affect the communities and populations in the study area. 5- Developing strategies for sustainable use of one of the threatened natural resources in Taif, Saudi Arabia. 6- Drawing distribution maps for the important medicinal plants using the GPS coordinates. 7- Determining the actual status of medicinal plants in this region.

العتيبي، ساميه عواض خراس

The current study aimed at examining the relationship between selfregulated learning strategies and reading comprehension. The study adopted a correlative descriptive methodology. Two instruments were used to achieve the results of the study: first, a researcher-prepared reading comprehension test of the first three units of first secondary grade textbook and second, an adopted Motivated Strategies for Learning Questionnaire. After confirming the validity and reliability of the study instruments, they were applied to the study sample which consisted of first secondary grade students from two secondary schools in Taif (N = 100; male =55 & female = 45). A number of statistical approaches were used in the study such as Cronbach's alpha coefficient, arithmetic means, standard deviations, Pearson's correlation coefficient, independent samples, t-test and analysis of regression. The results revealed that there were significant positive correlations between some strategies and reading comprehension, there were diversity in degrees of students' self-regulated learning strategies, there were no statistical significant differences at level (α = 0.05) between the average of male and female students and finally self-regulated learning strategies could predict first secondary grade students' reading comprehension. In the light of the results of the study, the following recommendations and suggestions were offered: it is important to raise EFL students and teachers' awareness of the importance and effectiveness of using self-regulated learning strategies in EFL learning and teaching, EFL teachers should teach self-regulated strategies along with content so that students understand how to apply the strategies, EFL supervisors should design training programs that include self-regulated learning for EFL teachers, EFL curricula planners and designers should include self-regulated strategies in EFL textbooks and courses to enrich EFL students' learning, finally, other researchers should conduct experimental studies that deal with self-regulated learning to develop various language skills among students in different educational levels. Key Words: Self-regulated Learning Strategies, Reading Comprehension, First Secondary Grade EFL Students.

الجعيد، غندورة ساير خلف

This research constitutes an attempt to explore the importance of sign language (SL), which is regarded as the mother tongue of deaf children, in increasing their learning skills. The influence of SL in learning when it is acquired during the preschool age is examined by comparing a deaf child of a deaf mother to a deaf child of a hearing mother. The researcher conducted a qualitative, descriptive case study to answer the following research questions: (a) How does EESL influence the learning skills of deaf children? (b) In what way does a deaf child communicate with her family, peers and teachers? and (c) What kind of difficulties does a deaf child, without early SL base, face when learning the written form of her first language? Interviews, participant observation and focus group interviews were used to collect the data at a primary school at which the deaf children are integrated. The findings highlighted the importance of EESL, in that it provides deaf children an effective tool that significantly improves their communication skills, social interaction, and ability to learn to read and to write. This consequently facilitates their overall learning skills substantially. Implications for the field of deaf education include opportunities for introducing learning or teaching SL at an early stage before enrolling deaf children in normal education, as well as engaging parents and siblings in SL instruction to help deaf children to learn SL and raise their self-confidence.

الغامدي ، مرام محمد عبد الله

This thesis studies the crucial role of religion and literacy as a means of enslaving and liberating black people in Frederick Douglass's Narrative of the Life of Frederic Douglass, an American ,Slave , Written by Himself, Solomon Northup's 12 Years a SIave, and Richard Wright's . Black Boy . lt points out how religion and literacy were used by the whites not only as intellectual and capitalist weapons but also as an ideological means of coercion, consent and docility to control the blacks for centuries. Many blacks were able to turn these two weapons against the whites and use them to liberate themselves and their race from enslavement. By examining the three autobiographies mentioned ,above the thesis aims at exposing the dangerous ideological role and the damaging effects of these weapons and demonstrating the blacks' liberation struggle. The analysis of these works provides a clear understanding of the role of religion and literacy from the slavery era until after the emancipation proclamation and even after the emergence of many modern black intellectuals. The thesis concludes by showing how these writers have managed to establish some viable social agents that are capable of envisioning and creating just, truthful, and peaceful society . Indeed, these black authors have proved the importance of their own literacy and education in overthrowing the entire system of slavery that has failed to achieve justice and equality for their black community and society as a hole.

الغامدي ، أسماء عبدالله سفر

Graphene is a two dimensional crystal of carbon with remarkable properties. It has very high carrier mobility, high transparency and remarkable tensile strength which makes graphene a promising material. Graphene is the ideal replacement for Indium Tin Oxide ITO. It has attracted worldwide interest in fundamental, experimental and applied research. In this work, we are interested in studying the electronic properties of some carbon based nanomaterials like carbon monolayer and carbon bilayer. At first, we study the electronic band structure of this carbon based nanostructure which is given by the tight-binding model. After that, we focus on theoretical studying of graphene's transport by using the linearized Boltzmann equation in order to calculate the conductivity and the mobility. The impurity scattering has been calculated. Then, we took into account the static and dynamic screening in order to deduce the probability of transition, the relaxation time, the conductivity and the mobility. The temperature effect was studied via the Thomas Fermi wave vector. Also, the phonon scattering was considered to calculate transport parameters in monolayer graphene. The last part of this work is devoted to study the temperature effect due to the screening on transport properties in bilayer graphene (BLG).

العتيبي، عقاب عبدالله خنيفس

The thesis is devoted to the theory of the boundary layer of the binary alloy, arising during its contact interaction with the aggressive solution of electrolyte destroying the alloy. Regardless of the fact that these investigations have a long history, the process of the scientific research of the mechanism of destroying doesn't overstep from its initial stage. They are insufficiently developed even its basic theoretical aspects, relating to the meeting-point of physics of metals, physics of concentrated electrolytes and physics of boundary layer phenomena. The necessity of their studying is increasing along with the toughening of technological conditions and the ecological problems becoming more and more complicated. The development of the theoretical model of interaction of the alloy-toelectrolyte system is indispensable for the development of the cost-efficient thoroughgoing measures for inhibition of the destroying process of the surface of the alloy.

السلمي ، غزواء عواد

Colon cancer is a major reason behind morbidity and increasing mortality rate around the world. Colon cancer ranks first in males and third in females in Kingdom of Saudi Arabia (KSA) among all other cancer types. Anticancer drugs have severe side effects and its clinical usage for cancer therapy is limited due to its toxicity. Choosing an alternative natural therapy might be a good choice to avoid toxic side effects of synthetic drugs-based therapies. Garden cress (Lepidium sativum L. (LS)) is grown in many parts of the world, including KSA and mainly used by people here in KSA as an herbal traditional therapy for different medical conditions. The aim of the present study was to evaluate the anticancer potential of LS seeds extracts against azoxymethane/dextran sodium sulfate (AOM/DSS) induced-colon cancer in male albino mice. In the present study, low (200 mg/kg) and high (400 mg/kg) doses of LS extract was used in treatment of the induced colon cancer in different phases or grades according to severity of the inflammatory induced colon cancer. The present results report that LS treatment for colon cancer mice, especially the high dose, decreases colon polyps/tumor incidence and size, tissues disorder, decreases expression of P53 in colon tissues in immunohistochemical evaluation and increases apoptosis in colon tissue. Moreover, LS therapy decreases micronucleus induction in polychromatic erythrocytes (PCE ), increases the ratio of PCE/normochromatic erythrocytes and decreases the percentage of sperm abnormalities. However, PCR-SSCP doesn’t show any point of mutations at exons 5 and 8 of the oncogene P53 in all treated groups, except for AOM group at exon 8 that shows band shift pattern. In summary, the present study provides therapeutic evidence that LS prevents the formation of colonic neoplasia in AOM/DSS induced colorectal cancer in mice by ameliorating colon inflammatory processe.

الطلحي، عفاف سعود رداد

Insulin resistance represents the common mechanism that leads to type 2 diabetes. Metformin and pioglitazone are insulin-sensitizing agents available for treatment of type 2 diabetes. Although oral agents and exogenous insulin ameliorated the hyperglycemia, they show limited ability to restore progressive β-cell damage. Therefore the challenge is to develop new strategies to antagonize insulin resistance and promote β-cell regeneration. On the other hand, the field of regenerative medicine is rapidly evolving, paving the way for novel therapeutic interventions through cellular therapies that are reshaping the biomedical field. So, the combination of metformin or pioglitazone with mesenchymal stem cells (MSCs) needs to be evaluated to improve the outcome of conventional therapy and minimize complications. The aim of this research is to investigate the role of mesenchymal stem cells (MSCs), alone or in combination with conventional therapeutic agents on type 2 diabetes and examined the molecular mechanism by which these agents influence insulin sensitivity. The present results indicated that bonemarrow derived MSCs in successfully able to ameliorate hyperglycemia and insulin resistance as well as improved insulin sensitivity in T2DM via insulin dependent and independent manner. Moreover, the combinations of metformin or pioglitazone with stem cells improve the outcome of conventional therapy and minimize complications as well as increase drugs sensitivity and effectiveness.

الحشيبري، عبدالله دخيل الله

The thermal convection instability for horizontally layer of visco-elastic fluid (oldroyed fluid –walter's 'lquid B') heat from the below and rotation about the vertical axis z , in the presence of electric field and thermal re-laxation time are consider . By using Linaer stability theory and normal mode analysis to derive di-fferential equation of tenth order , and exact eigen value equation exact solution for normal instability is obtianed under artificial boundary con-ditions somewhat , can be solved this equation accurately to yield the re-quired eigen value relaitionship from which are determined various criti-cal values . Wave number and Critical Rayleigh number for onset of instability are displayed graphically as a function of the parameters such as relaxation time , Taylor number and anthers parameters .

الثبيتي ، شادية عبد الله

In order to understand the mechanism of break - up of thermo- capillary liquid jets, the linear temporal instability should be investigated to predict the same size of producing small spherical pellets. In this thesis , we consider a viscous liquid jet emerging from a nozzle subject to thermo-capillary effect. Moreover, we use the asymptotic approach to reduce the governing equation to one-dimensional (1-D). The steady state solutions have been found for thermo-capillary viscous liquid jets, and then the linear instability analysis has been investigated of the resulting set of equation .

النفيعي، صفاء عائش عيظه

Let
be a ring (not necessary commutative) with identity 1 and  be a unitary right
-module. In this thesis we study the transfer of some algebraic properties between the base ring
and the skew Hurwitz series ring  = (
, ) and the skew Hurwitz polynomial ring  = (ℎ
, ). Also, we transfer some algebraic properties between the base module  and the skew Hurwitz series (polynomial) module  (ℎ ) over the ring . In Chapter (3), we prove, among other results, the following: 1. If
is a ring in which at least one prime number is not a unit, then  = (
, ) is not a Noetherian ring, 2. If ℎ(
) =  ≠ 0, then  = (
, ) is not Noetherian, 3.  = (
, ) is Noetherian if and only if
is Noetherian and ℚ ⊆
, 4. Let ℚ ⊆
. Then  is a Noetherian right
-module if and only if  is a Noetherian right -module, 5.  is a Hopfian right
-module if and only if  is a Hopfian right -module, 6. Let  be a right
-submodule of  . If  is a maximal right - submodule of , then  is a maximal right R-submodule of  , 7. If  is a simple right
-module, then  is a cyclic right -module. In Chapter (4), we prove, among other results, the following: 1. If  is a right zip -module, then  is a right zip
-module, 2. Let  be a -reduced module and a torsion-free as a ℤ-module. If  is a right zip
-module, then  is a right zip -module, 3. Let  be a -reduced module and a torsion-free as a ℤ-module. If  is a right Beachy-Blair R-module, then  is a right Beachy-Blair Amodule. Finally, in Chapter (5), we prove, among other results, the following: 1. Let
be a -compatible an NI-ring that is a torsion free as a ℤ-module. Then
satisfies the right weak Beachy-Blair condition if and only if  = (ℎ
, ) satisfies the right weak Beachy-Blair condition. 2. Let
be a -compatible an NI-ring that is a torsion free as a ℤ-module. If
satisfies the right weak Beachy-Blair condition, then  = (
, ) satisfies the right weak Beachy-Blair condition. The results in Chapter (3) are accepted for publication in Far East Journal of Mathematical Sciences. However the results in Chapter (4) and Chapter (5) have been submitted for publication in two papers with the same name of the associated chapter.

الشهراني، ريم عايض سالم

Bacterial Meningitis (BM) is a life-threatening infection associated with a high mortality and morbidity worldwide. in infants and children. It is an important cause of childhood mortality and those who survive are at a higher risk of developing permanent neurological disability. Neisseria meningitidis, Haemophilus influenzae, and Streptococcus pneumoniae are the most prevalent infectious agents that cause bacterial BM with different proportions. S.agalactiae (Group B Streptococci GBS) is also a cause of infection during the first weeks of life. The objective of this study was to determine the frequencies of these four bacteria using bacterial cultures and polymerase chain reaction (PCR). During one year (2016) study period, 712 CSFs samples were collected from suspected meningitis patients: 469 males (65.87%) and 243 females (34.12%). The boy-to-girl ratio was 1.93:1. The positive bacterial growth was obtained from two CSF samples. The pathogens identified are Salmonella spp and Citrobacter freundii. The Salmonella spp strain was sensitive to almost all antibiotics used in the Taif children's hospital except amikacin, gentamicin, cephalothin, cefoxitin, ceferoxim whereas Citrobacter freundii was sensitive to all cephalosporins tested and resistant to aminoglycosides, carbapenems and fluroquinolones. 115 samples, out of 712 enrolled CSF samples, were subjected to multiplex PCR, 5 samples yielded a positive signal and 110 samples failed to yield detectable amplification signal. The proportion of CSF samples with etiologic agent identified by mPCR is 4.3% (5/115). Pathogens identified were : S. pneumoniae (n=2), H. influenzae (n= 2) and N. meningitidis (n=1). S. agalactiae (group B streptococci) was not detected by PCR assay. Two serogroupes , 19A and 23F, of S. pneumoniae and one serogroup , A, of N. meningitidis were identified .In conclusion, in the present study, the PCR method was more sensitive and rapid than culture for detecting the infectious agents in BM. For this reason, this diagnosis method is recommended for BM.

الثبيتي، عمرو عبدالله

The study aimed at examining whether there was a relationship between Saudi EFL undergraduates’ metacomprehension and their reading comprehension, reading performance, and language proficiency. More specifically, the objective was to investigate the validity of using the Saudi EFL undergraduates’ metacomprehension as a predictor for their reading comprehension, reading performance, and language proficiency. The study group consisted of 104 Saudi undergraduate males at the preparatory year from Taif University. Data analysis was carried out using both correlational and regression methods. The EFL undergraduates’ metacomprehension was assessed using the Metacomprehension Scale (MCS) designed by Moore, Zabrucky, and Commander (1997). After administrating the survey (the Metacomprehension Scale), students were provided with three reading texts. The reading performance was the sum of the correct answers. The reading comprehension represented by a combination of both pre- and post-test comprehension judgments. Results showed that the MCS may be a reliable and valid predictor of Saudi EFL undergraduates’ reading performance, reading comprehension and language proficiency as well. This reflected the importance of using metacognition tests in language learning. Another objective of the study was to examine the accuracy of both pre-test and post-test comprehension judgments. The results of the study indicated that post-test iv comprehension judgments were more accurate than pre-test comprehension judgments. The importance of improving language learners' metacomprehension accuracy may influence their regulation of studying and positively enhance their reading performance. Therefore, it is highly recommended for future research to propose new methods to improve metacomprehension and its accuracy and to evaluate them over longer period.

الزهراني ، داليا محمد سعيد

الجعيد ، الهنوف عبدالرحمن

The evolution of technology has increased the use of mobile applications. In today’s world, people are using mobile apps in almost every aspect of life. Since learning English language is a necessity, this study was conducted to investigate the use of mobile English language learning (MELL) apps to enrich English as a foreign language (EFL) learners’ study of English. The researcher addressed the following three questions: (1) To what extent is the use of MELL apps beneficial in the classroom? (2) To what extent do MELL apps facilitate EFL learners’ study of English? (3) To what extent is there a difference between learning with MELL apps and through traditional methods? A mixed-method approach was adopted by collecting quantitative and qualitative data. The researcher used a questionnaire to collect quantitative data. The sample consisted of fifty female first-year university students in the Home Economics department of Taif University, Saudi Arabia, who were studying EFL to fulfil their bachelor’s degree requirements. The researcher also interviewed five students to collect qualitative data. The questionnaire data were analysed using descriptive analysis, mean standard scores, and standard deviation. The interview data were qualitatively analysed. The findings indicate that EFL learners found MELL apps enjoyable and easy to use. They noted that MELL apps were useful and helpful in improving their listening skill, grammar learning, and enhancing their vocabulary. In addition, the investigation revealed how learning with MELL apps differs from learning through traditional methods in that learning with MELL apps is more learner-centred. This study could be helpful for EFL learners and instructors to know which external factors might affect the EFL learners’ acceptance of technology. Also, how to improve the English language teaching and learning process.