203,368 research outputs found
Thermal ecology and activity of the sand fish lizard, scincus mitranus (Scincidae) in Central Arabia
No full textAuthors: Al-Johany Awadh M.& Al-Sadoon, Mohamed K. From Department of Zoology,
Author: Al-Farraj Saud A., From Department of Biology
Riyadh, Teachers' College, King Saud University, P.O. Box 4341,
Riyadh 11491. Saudi ArabiaThermal ecology and activity of Scincus mitranus was investigated during winter and summer seasons. Emergence and basking behavior and seasonal activity were studied and analyzed. The lizard was active throughout the year except during cold spells of winter. However, it was found that during winter, daily activity was unimodal, which contrasted with the bimodal pattern during summer. Selected body temperature, critical minimum and maximum were studied and determined in the laboratory
The Resilience of monarchy in the middle east reconsidered: a case study of Saudi Arabia
No full textThe paper evaluates three common perspectives used by scholars to explain the resilience of Middle East monarchies: the intervention, cultural and functional. It shows the limitations of the three perspectives in explaining the resilience of the AI-Saud monarchy and proposes the statecraft perspective as an alternative explanation. Statecraft perspective, or leadership skills and techniques are the most important factors behind the creation and continuity of political systems in Saudi Arabia and the Middle East
Synthesis and spectroscopic properties of some pyrimido[4,5-b]quinoliiie derivatives
No full textAuthor: 1, Women Students Medical Studies & Sciences Sections, Chemistry Department,
College of Science, King Saud University
P.O. Box 22452, Riyadh 11495.
Author: 3, From Chemistry Department, College of Science, King Saud University
P.O. Box 2455, Riyadh 11451.Several substituted pyrimido[4,5-b]quinoline were synthesized from the intermediates: 2-chloro-3-quinolinecarbonitrile (1d), 2-amino-3-quinolinecarbonitrile (1h) and 2-oxo-3-quinolinecarboxylic acid (1g), via cyclization with urea, thiourea, guanidine, formamide and acetic anhydride. Structural elucidation of the prepared quinolines and pyrimido[4,5-b]quinolines was mainly based on the spectroscopic methods, and in particular, MS and NMR spectr
Incidence of orofacial pain in a selected population at King Saud University college of dentistry emergency clinic
No full textA retrospective analysis was conducted of patients who attended an emergency dental clinic in Riyadh, Saudi Arabia, complaining of orofacial pain. The age-range was 15-79 years. The non-random sample included 653 (62.7%) females and 388 (37.3%) males. Results showed that the highest percentage of the patients (62.1 %) had pulpal pain followed by those (24.3%) with periodontal pain. Patients in the age- group 25-34 years (38.3%) attended the emergency clinic more often than any other age-group. Results also showed that the age-group 25-34 years had a higher incidence in all pain categories when compared to any other age-group. Female subjects were the majority in all age-groups. The percentage of various pain conditions in rela- tion to gender and age are also presented.The College of Dentistry Research Center, King Saud University, Grant #NF 1182
Population dynamics of rhopalosiphum padi (L.) on wheat and myzus persicae (sulzer) on spinach under irrigation from two different water sources
No full textSeasonal abundance of Myzus persicae (Sulzer) on spinach leaves and Rhopalosiphumpadi (L.) on wheat stems were estimated in 1988 and 1989. Two types of water were used in irrigation (fresh water and treated municipal waste water). The aphid densitiesofthe first season on both crops were significantly higher than in the second season. M. persicaeand R. padi were first detected in late December and reached a peak early February. Type of water had shown no significant effect on population densities of both aphid species.Correspong Author:
Dr. Yousif N. Aldryhim, Professor of Entomology
College of Food & Agricultural Sciences, King Saud University, P.O. Box 2460, Riyadh 11451
Saudi Arabia. Email: [email protected]
Factors affecting protein extractability of defatted karkade (hibiscus sabdariffa)seed flour
No full textFood Science Department, College of Agriculture, King Saud University, Riyadh, Saudi ArabiaKarkade seed flour was defatted by two different methods. The cold method was better than the hot method in terms of protein extractability. Protein extractability was studied under various condi-tions of pH (2-12), time (30, 45, 60min), salt type (CaCI2, NaCl) , solvent: flourratio (10:.1,15:1,20:1) and salt concentrations (0.2, 0.4, 0.6, 0.8 and 1 M). Results showed that protein extractability was dependent on pH, type of salt and salt concentration. Higher yield was obtained with CaCI2 than NaCI. Highest pro-tein yield was obtained at pH 11 and at 0.4 M CaCl2
Pattern of malocclusions in saudi arabian patients attending for orthodontic treatment at the college of dentistry, king Saud University, Riyadh
No full textThe prevalence of many orthodontic-related variables was investigated and analyzed in the largest
orthodontic clinic in Saudi Arabia. The results of the study indicate that the majority of the orthodontic
cases were young patients with females showing a marginally higher percentage than males. Class
I molar relationship, permanent dentition, ovoid arch form, crowding, asymmetrical tooth extraction
and asymmetrical arch were found most frequently. A very strong correlation was found between
asymmetrical tooth extraction and the existence of dental arch asymmetry. Cross bite, crowding and
class III molar relationship may be the principal reasons for patients to seek orthodontic treatment.Corresponding Author:
Dr. Khalid M. Al-Balkhi, Department of Preventive Dental Sciences, Division of Orthodontics and Dentofacial Orthopedics, King Saud University, College of Dentistry, P.O. Box 60169, Riyadh 11545, Saudi Arabia. Email: [email protected]
Sources of stress as perceived by nursing students at King Saud University Campus AL-Riyadh"
No full textThe aim of this study was to examine sources of stress as perceived by Baccalaureate nursing students at King Saud University campus-AL Riyadh. This aims conducted through three main objectives The study is conducted at Female College of Nursing, King Saud University at Al-Riyadh City.The present study results concluded that their where a variety of stressor where placed on the studied subjects.
The major sources of stress as perceived by King Saud University College of Nursing where the academic followed by intrapersonal, then environmental & the last sources of stress for these students was interpersonal
Entomofauna of alfalfa in Riyadh, Saudi Arabia
No full textInsect fauna of alfalfa was surveyed during two successive years (from October, 1990 until Sep-tember, 1992) at Derab Experimental Research Station, College of Agriculture, King Saud University, Riyadh. Samples of insects were collected weekly using a standard 15" sweeping net. The identification of insects revealed the prevalence of 103 insect species belonging to 94 genera, 49 families and 10 orders of class insecta. Of these insects, 18 species were recorded for the first time in Saudi Arabia. The insect fauna of alfalfa was divided, according to their importance to alfalfa grower, to the following categories of insects expressed in percentages; 48% phytophagous insects, 25.6% entomophagous insects, 21.6% pol-linating insects and 4.8% for other insects (saprophagous, scavengers --- etc.). Studying entomofauna of alfalfa is important for developing integrated pest management programs for alfalfa and neighborin
Synthesis and biological screening of some new substituted 2-Mercapto-4-(3H)-Quinazolinone analogs as anticonvulsant agents
No full textCorresponding Author:
Dr. Adnan A. Kadi
Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh-11451, Saudi Arabia.
Phone: +966-1-467-7344 Fax: +966-1-467-6220
Email: [email protected] new series of 2-mercapto-3-(4-chlorophenyl)-4-oxo-6-iodoquinazoline
was synthesized and characterized by their elemental analysis, 1H NMR and mass spectral data. The anticonvulsant
activities of prepared compounds have been examined using the PTZ-seizure threshold test. Compounds 2a,b, 3a, 4a,b, 12 and 13a-c
showed a significant anticonvulsant activity (at 200 mg/kg dose/level)
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