Digital Commons Network^™

Race: A Robust Adaptive Caching Strategy For Buffer Cache, Yifeng Zhu, Hong Jiang

School of Computing: Faculty Publications

While many block replacement algorithms for buffer caches have been proposed to address the well-known drawbacks of the LRU algorithm, they are not robust and cannot maintain an consistent performance improvement over all workloads. This paper proposes a novel and simple replacement scheme, called RACE (Robust Adaptive buffer Cache management schemE), which differentiates the locality of I/O streams by actively detecting access patterns inherently exhibited in two correlated spaces: the discrete block space of program contexts from which I/O requests are issued and the continuous block space within files to which I/O requests are addressed. This scheme combines global I/O …

Sedimentology And Stratigraphic Architecture Of The Late Permian Betts Creek Beds, Queensland, Australia, Jonathan P. Allen, Christopher R. Fielding

Department of Earth and Atmospheric Sciences: Faculty Publications

The Late Permian Betts Creek Beds form a succession of coal-bearing alluvial-coastal plain sediments in a basin marginal setting within the northeastern Galilee Basin, Queensland, Australia. The unit is ~ 50–60 m in thick­ness at Porcupine Creek National Park where outcrop is laterally continuous for several kilometers. Eight fa­cies have been identified within the formation and can be grouped into 2 facies associations: (A) channel depos­its and (B) floodbasin deposits. The channel association consists of conglomerate (A1) and trough cross-bedded multistorey sandstone facies (A2), both interpreted as deposits of low-sinuosity river systems, tidally influenced fluvial channels (A3), interbedded sandstone and …

Forum: Diverse Voices And Alternative Rationalities: Forum Introduction, Kathleen J. Krone

Department of Communication Studies: Faculty Publications

As I thought of what I might say to introduce a Forum calling for diverse voices and alternative rationalities in organizational communication research, I found myself reflecting on my own experience as an organizational communication scholar. For the past 20-some years, I have worked as a faculty member in five very different communication departments in five different colleges, in five different universities in the Southwest and Midwest United States. Based on what feels like a rather broad range of experience (at least here in the United States), it is hard sometimes to understand myself as part of a field with …

Differences In Virulence Among Escherichia Coli O157:H7 Strains Isolated From Humans During Disease Outbreaks And From Healthy Cattle, Diane R. Baker, Rodney A. Moxley, Mike B. Steele, Jeffrey T. Lejeune, Jane Christopher-Hennings, Ding-Geng Chen, Philip R. Hardwidge, David H. Francis

School of Veterinary and Biomedical Sciences: Faculty Publications

Escherichia coli O157:H7 causes life-threatening outbreaks of diarrhea, hemorrhagic colitis, and hemolyticuremic syndrome in humans and significant economic loss in agriculture and could be a potential agent of bioterrorism. Although the prevalence of E. coli O157:H7 in cattle and other species with which humans have frequent contact is high, human infections are relatively uncommon, despite a low infectious dose. A plausible explanation for the low disease incidence is the possibility that not all strains are virulent in humans. If there are substantial differences in virulence among strains in nature, then human disease may select for high virulence. We used a …

Bias Voltage Dependence Of Tunneling Anisotropic Magnetoresistance In Magnetic Tunnel Junctions With Mgo And Al2O3 Tunnel Barriers, Li Gao, Xin Jiang, See-Hun Yang, John D. Burton, Evgeny Y. Tsymbal, Stuart S. P. Parkin

Evgeny Tsymbal Publications

Tunneling anisotropic magnetoresistance (TAMR) is observed in tunnel junctions with transition metal electrodes as the moments are rotated from in-plane to out-of-plane in sufficiently large magnetic fields that the moments are nearly parallel to one another. A complex angular dependence of the tunneling resistance is found with twofold and fourfold components that vary strongly with bias voltage. Distinctly different TAMR behaviors are obtained for devices formed with highly textured crystalline MgO(001) and amorphous Al₂O₃ tunnel barriers. A tight-binding model shows that a fourfold angular dependence can be explained by the presence of an interface resonant state that …

Forage Potential Of Temperate Legumes With Perennial Grasses In The Southern Plains, John A. Guretzky, Twain Butler, Matt Mattox

Department of Agronomy and Horticulture: Faculty Publications

INTRODUCTION

Rising costs of N fertilizer coupled with evidence of improved forage production and quality has increased interest among beef cattle producers in legume-grass mixtures for pasture. Our objectives were to evaluate forage yields of temperate legumes seeded with perennial grasses in the Southern Plains. Replicated field trials were established in 2006 at Burneyville, OK; Vashti, TX; and Stephenville, TX, to evaluate potential legume dry matter (DM) yields under different soil and rainfall regimes.

MATERIALS AND METHODS

Burneyville. Legumes were broadcast-seeded and lightly raked by hand within individual 3 x 5 m plots in an existing stand of eastern gamagrass …

Transfected Cell Arrays For The High-Throughput Analysis Of Transcription Factor Activity, Abigail D. Bellis, Angela K. Pannier, Lonnie D Shea

Department of Agricultural and Biological Systems Engineering: Presentations and White Papers

Transfected cell arrays offer a high-throughput method that allows for the parallel analysis of multiple pathways or genes within a physiological context. We have developed a transfected cell array that employs a dual-plasmid system that gives the ability to normalize for spot-to-spot variation in transfection efficiency. Each spot within the array contains a constitutively active normalization plasmid encoding for renilla luciferase as well as a functional plasmid that contains transcription factor specific binding elements driving the expression of firefly luciferase. Dual bioluminescent imaging provides highly sensitive analysis while limiting post-transfectional processing. Adequate transfection poses a significant challenge in extending this …

Manure Testing: What To Request?, Charles A. Shapiro, Charles S. Wortmann

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Manure testing is necessary to make optimum use of manure while protecting water resources. This publication is a guide to providing information on a Manure Sample Sub­mission Form for reliable interpretation of results.

The tests most frequently needed to optimize nutrient management are total and ammonium nitrogen (NH₄-N), phosphorus (P₂O₅), potassium (K₂O), pH, soluble salts, sodium, and dry matter content.

Nitrogen. Manure contains both organic and inorganic forms of nitrogen. Ammonium-N is the primary inorganic form in manure and is readily available to crops. Nitrate-N concentration is usually too small to …

Lipidomic Analysis Of Glioblastoma Multiforme Using Mass Spectrometry, Soo Jung Ha, Gordon Showalter, Shanbao Cai, Haiyan Wang, Wei Michael Liu, Aaron Cohen-Gadol, Jann N. Sarkaria, Jenna Rickus, John Springer, Jiri Adamec, Karen E. Pollok, Kari L. Clase

Department of Biochemistry: Faculty Publications

Glioblastoma multiforme (GBM) is the most common and malignant form of primary brain tumors. It is highly invasive and current treatment options have not improved the survival rate over the past twenty years. Novel approaches and technologies from systems biology have the potential to identify biomarkers that could serve as new therapeutic targets for GBM. This study employed lipid profiling technology to investigate lipid biomarkers in ectopic and orthotopic human GBM xenograft models. Primary patient cell lines, GBM10 and GBM43, were injected into the flank and the right cerebral hemisphere of NOD/SCID mice. Tumors were harvested from the brain and …

Identifying Mechanistic Models Of Spatial Behavior Using Pattern-Based Modeling: An Example From Lizard Home Ranges, Andrew J. Tyre, Gregory D. Kerr, Brigitte Tenhumberg, C. Michael Bull

School of Biological Sciences: Faculty Publications

Landscape and population level patterns form through the aggregation of responses of individual organisms to heterogeneity. Spatial organization within a population can range from random overlap of individual home ranges, to completely exclusive territories, with most populations falling somewhere between these two extremes. A fundamental question in behavioral ecology concerns the factors that influence the degree of spatial overlap of home ranges, and the processes that determine how likely it is that an individual will access resources over its home range. However, traditional experimental methods are not always practical or possible. Pattern-based modeling is an alternative, non-intrusive technique for explaining …

Harmonic Holography: A New Holographic Principle, Ye Pu, Martin Centurion, Demetri Psaltis

Martin Centurion Publications

The process of second harmonic generation (SHG) has a unique property of forming a sharp optical contrast between noncentrosymmetric crystalline materials and other types of material, which is a highly valuable asset for contrast microscopy. The coherent signal obtained through SHG also allows for the recording of holograms at high spatial and temporal resolution, enabling whole-field four-dimensional microscopy for highly dynamic microsystems and nanosystems. Here we describe a new holographic principle, harmonic holography (H²), which records holograms between independently generated second harmonic signals and reference. We experimentally demonstrate this technique with digital holographic recording of second harmonic signals …

Half Metallic Ferromagnets, Peter A. Dowben

Peter Dowben Publications

Since its introduction by de Groot and colleagues in the early 1980s [1], the concept of half metallic ferromagnetism has attracted great interest. Idealized, half-metals have only one spin channel for conduction: the spin-polarized band structure exhibits metallic behavior for one spin channel, while the other spin band structure exhibits a gap at the Fermi level. Due to the gap for one spin direction, the density of states at the Fermi level has, theoretically, 100 % spin polarization. This gap in the density of states in one spin at the Fermi level, for example ↓ so N↓(E_{F …}

Structure And Thermophysical Properties Of Single-Wall Si Nanotubes, Xinwei Wang, Zhen Huang, Tao Wang, Yuk Wai Tang, Xiao Cheng Zeng

Xiao Cheng Zeng Publications

In this work, molecular dynamics (MD) simulation based on the environment-dependent interatomic potential is carried out to explore the structure, atomic energy distribution, and thermophysical properties of single-wall Si nanotubes (SWSNTs). The unique structure of SWSNTs leads to a wider range energy distribution than crystal Si (c-Si), and results in a bond order in the range of 4.8~5. The thermal conductivity of SWSNTs is much smaller than that of bulk Si, and shows significantly slower change with their characteristic size than that of Si films. Out of the three types of SWSNTs studied in this work, pentagonal SWSNTs have the …

Quaternary Glaciation And Hydrologic Variation In The South American Tropics As Reconstructed From The Lake Titicaca Drilling Project, Sherilyn C. Fritz, Paul A. Baker, Geoffrey O. Seltzer, Ashley Ballantyne, Pedro Tapia, Hai Cheng, R. Lawrence Edwards

Department of Earth and Atmospheric Sciences: Faculty Publications

A 136-m-long drill core of sediments was recovered from tropical high-altitude Lake Titicaca, Bolivia-Peru, enabling a reconstruction of past climate that spans four cycles of regional glacial advance and retreat and that is estimated to extend continuously over the last 370,000 yr. Within the errors of the age model, the periods of regional glacial advance and retreat are concordant respectively with global glacial and interglacial stages. Periods of ice advance in the southern tropical Andes generally were periods of positive water balance, as evidenced by deeper and fresher conditions in Lake Titicaca. Conversely, reduced glaciation occurred during periods of negative …

Progress In Immunotherapy Rituximab, Manal M. El-Habbash, Abukris M. Alwindi

Saudi Medical Journal

Rituximab is an anti-CD20 chimeric monoclonal antibody that has shown substantial activity. Since its discovery, rituximab has been used with great success in a variety of hematological malignancies. Its success in the management of aggressive lymphomas led to expansion of its use in other conditions such as stem cell transplantation, post-transplant lymphoproliferative disorder, and other non-malignant conditions where B cell activation is thought to be important, such as idiopathic thrombocytopenic purpura and rheumatoid arthritis. The side effects have been remarkably few, particularly, infection is not more common than with chemotherapy alone. This article reviews the structure, mechanism of action, and …

The Effects Of Allopurinol On Rat Liver And Spleen Tissues In A Chronic Hyperammonemia Animal Model, Alpaslan Gokcimen, Ahmet Kocak, Kanat Gulle, Recep Sutcu, Onur Elmas, Sadettin Caliskan, Fehmi Ozguner

Saudi Medical Journal

OBJECTIVE: To investigate whether hyperammonemia can lead to any structural change in liver and spleen tissues or biochemical changes in blood and if allopurinol (ALLO) has a protective effect in hyperammonemia. METHODS: This study was conducted between April and May 2006. Thirty-six females Wistar Albino rats were randomly divided into 3 equal groups: Controls, administered with ammonia (NH3) and administered with NH3 + ALLO groups. Ammonium acetate (2.5 mmole/kg/day) was injected to NH3 group intraperitoneally (IP) for 28 days. The other group received ammonium acetate (2.5 mmole/kg) plus ALLO (50 mg/kg) IP for 28 days. After finishing the study, blood …

The Effect Of Nigella Sativa Oil Against Aspiculuris Tetraptera And Hymenolepis Nana In Naturally Infected Mice., Erol Ayaz, Hasan Yilmaz, Hanefi Ozbek, Zeynep Tas, Ozlem Orunc

Saudi Medical Journal

OBJECTIVE: To investigate the antiparasitic effect of Nigella sativa oil (NSO) on Aspiculuris tetraptera (A. tetraptera) and Hymenolepis nana (H.nana) in mice in January 2005. METHODS: Mice were obtained from the animal house facility of the Faculty of Medicine, Yuzuncu Yil University, Van, Turkey. The natural infections were determined by the cellophane tape method and the centrifugal flotation method of stool samples. The infected mice with A. tetraptera and H.nana were divided into 4 groups; 2 treatment and 2 control groups. Nigella sativa oil was given at the dose of 250 ul/kg body weight orally for 2 consecutive days in …

The Effects Of Isothermic Or Hypothermic Carbondioxide Pneumoperitoneum On Arterial Blood Gases, Abdullah Ozgonul, Ceylan Erkan, Gencer Mehmet, Baysal Zeynep, Uzunkoy Ali

Saudi Medical Journal

OBJECTIVE: To investigate the effects of isothermic or hypothermic carbon dioxide used for pneumoperitoneum during laparoscopic cholecystectomy on blood gases. METHODS: Between 2004 and 2006, 62 patients (American Society of Anesthesiologists grade I, II, and III for elective laparoscopic cholecystectomy) (age between 18 and 70 years), were enrolled in this prospective randomized study. The patients were divided into 2 groups. In the isothermic group, 37 degree celcius carbon dioxide was used, and 21 degree celcius carbon dioxide was used in hypothermic group. Core body temperature at esophagus and skin temperature were measured at 10-minute intervals beginning just before insufflation and …

Evaluation Of The Effect Of Islamic Fasting On Lung Volumes And Capacities In The Healthy Persons, Seyyedali J. Moosavi, Ali Kabir, Ali Moghimi, Ali Chehrei, Mohammad B. Rad

Saudi Medical Journal

OBJECTIVE: To evaluate the changes in pulmonary volumes during and after Islamic fasting. METHODS: It is a cohort study conducted on 117 healthy subjects selected on a random basis from employees, professors and students of Iran University of Medical Sciences, Tehran, Iran, between December 1999 and January 2000. All of them underwent spirometry 10 days prior to Ramadan, 2 times during Ramadan, and one time 10 days post-Ramadan. In first visit, in addition to spirometry they underwent medical examination to make sure they are healthy. All of their spirometries and background information were collected. Repeated measurements analysis of varience method …

Pattern Of Renal Pathology Among Renal Biopsy Specimens In Eastern Saudi Arabia, Ahmed M. Alkhunaizi

Saudi Medical Journal

OBJECTIVE: To identify the pattern of renal pathology among renal biopsy specimens, and to study the clinical correlation in a general hospital in the eastern region of the Kingdom of Saudi Arabia. METHODS: All patients who underwent native kidney biopsy by the author at Dhahran Health Center (DHC) between June 1998 and April 2005 were included and prospectively followed-up. RESULTS: One hundred native kidney biopsies were performed on 95 patients with a mean age of 40.8 ± 18 years, and a glomerular filtration rate of 57 ± 42 ml/min/1.73 m2. Patients were followed up for a mean of 28 ± …

Gonadal Function And Fertility In Male Survivors Treated For Hodgkin's Disease In Iran, Khadijeh A. Rafsanjani, Mohammad Faranoush, Amir A. Hedayatiasl, Parvaneh Vossough

Saudi Medical Journal

OBJECTIVE: To investigate the effect of chemotherapy on gonadal function of young men cured of childhood Hodgkin9s disease. METHODS: Young adult males surviving Hodgkin9s disease, aged 17 and over at least 2 years after therapy were studied in Ali Asghar Children9s Hospital, Tehran, Iran from March 2000 to March 2005. Clinical evaluation for secondary sexual characteristics, semen analysis, follicle stimulating hormone (FSH), luteinizing hormone (LH), and testosterone was studied in 33 survivors of Hodgkin9s disease. RESULTS: The age at diagnosis was 5-15 years, median 9 years, age at study 17-29 years, median 19 years old. The median duration off therapy …

Dietary Intervention Versus Metformin To Improve The Reproductive Outcome In Women With Polycystic Ovary Syndrome. A Prospective Comparative Study, Hussein S. Qublan, Eleni K. Yannakoula, Mohamad A. Al-Qudah, Fahmi I. El-Uri

Saudi Medical Journal

OBJECTIVE: To compare the clinical results and reproductive outcome in obese women with polycystic ovary syndrome (PCOS) following dietary intervention or treatment with metformin. METHODS: Forty-six patients with PCOS were studied prospectively in Prince Rashed Hospital, Irbid, Jordan, between January 2003 and April 2005. The women were randomly divided into 2 groups: Group 1 (n=24) was prescribed with 1200-1400 kcal/day diet (25% proteins, 25% fat, and 50% carbohydrates plus 25-30 gm of fiber per week). Group 2 (n=22) was assigned to take 850 mg of metformin twice in a continuous manner. Both treatments continued for 6 months. Clinical and biochemical …

An Investigation Of Corneal Integrity In Recreational Divers, Matthew O. Oriowo

Saudi Medical Journal

OBJECTIVE: To compare the corneal integrity of recreational divers and non-divers. METHODS: The cross-sectional study was conducted at the St. Erik s Eye Hospital, Stockholm, Sweden, between September 2003 and February 2004. Questionnaires were randomly distributed to determine the potential diving and non-diving participants. After filling the questionnaires and giving informed consent, corneal endothelial photographs were obtained from the right eyes of the study participants (age range, 20-42 years). Aided and unaided visual acuities were obtained using the Snellen acuity chart. RESULTS: One of the divers reported temporary blurred vision immediately after a diving session, which resolved 2 days later. …

Etiology And Pathology Of Enuresis Among Primary School Children In Isfahan, Iran, Afshin Azhir, Fatemeh Nasseri, Aliyar Fazel, Atoosa Adibi, Ziba Frajzadegan, Abol-Hassan Divband

Saudi Medical Journal

OBJECTIVE: To determine the etiology and pathogenesis of enuresis among primary school children by using a special ultrasound (US) protocol for the assessment of bladder dysfunction and to compare excretion of urinary sodium and calcium in enuretic children. METHODS: We conducted this cross sectional study on 66 enuretic children aged 6-12 years from September 2005 to January 2006 in Isfahan University of Medical Sciences, Iran. Ultrasound (US) was designed for the evaluation of bladder parameters using bladder volume and wall thickness index (BVWI%), and expected percentage bladder volume index for kidney volume. RESULTS: Sixty children (90.9%) had nocturnal enuresis, 5 …

Allergic Fungal Sinusitis In Children In Saudi Arabia, Jamil N. Al-Swiahb, Ahmed Al-Ammar, Surayie H. Al-Dousary

Saudi Medical Journal

OBJECTIVE: To report the allergic fungal sinusitis (AFS) in children in Saudi Arabia and to review the experience of King Abdul-Aziz University Hospital in diagnosis and management of AFS in children. METHODS: Hospital charts of 45 children reviewed retrospectively. Clinical presentation, radiological and operative findings, management and outcomes studied. Only 25 patients had =/> 4 diagnostic criteria, treated endoscopically between January 2000 and December 2005 and followed at least 2 years in KAUH, Riyadh, Kingdom of Saudi Arabia. RESULTS: Twenty-five patients had at least 4 criteria for AFS. All patients underwent functional endoscopic sinus surgery (FESS) with high recurrence rate, …

Effect Of Breastfeeding On Growth In Yemeni Infants, Lutf M. Al-Zubairi, Yahia A. Rajaa, Intesar A. Al-Saidi

Saudi Medical Journal

OBJECTIVE: To estimate the prevalence of effective breastfeeding (EBF) practice and its association with weight of young infants, mother9s education, employment status, and parity. METHODS: The study is a cross-sectional, conducted in Dula Health Center in Sana9a city, the capital of Yemen during the year 2003. Six hundred and twenty-one mothers and their exclusively breastfed apparently healthy infants attended to the health center for immunization were enrolled in the study. Effective breastfeeding was evaluated according to the World Health Organization integrated management of childhood illnesses literature. Weight was measured using Seca scale. We conducted interview to investigate the age of …

Age At Maximum Growth Spurt In Body Height For Saudi School Children Aged 9-18 Years, Sulaiman Al-Emran, Huda M. Al-Kawari, Hoda M. Abdellatif

Saudi Medical Journal

OBJECTIVE: To provide growth reference values in body height, to determine the specific age at peak height velocity for Saudi male and female adolescences aged 9-18 years and to evaluate the appropriateness of using the Centers for Disease Control/National Center for Health Statistics (CDC/NCHS) growth standards in body height for the assessment of Saudi adolescents. METHODS: A cross-sectional anthropometric survey was conducted in 1053 Saudi male and female school children living in Riyadh city. The study sample was collected in the year 2000 and data were completed and refined in the year 2002. Standing height measurements were recorded for each …

Association Of Breast Cancer And Cytokine Gene Polymorphism In Turkish Women, Guzin Gonullu, Bilkay Basturk, Turkkan Evrensel, Barboros Oral, Ayse Gozkaman, Osman Manavoglu

Saudi Medical Journal

OBJECTIVE: To investigate the association of cytokine gene polymorphism with the development of breast cancer. METHODS: The study was carried out in Uludag University Medical School, Bursa, Turkey. The study included 38 patients with breast cancer admitted to the Medical Oncology outpatient clinic, and 24 healthy controls, age and sex matched, from the Internal Medicine Department between 2004 and 2005. All genotyping of tumor necrosis factor-alpha (TNF-alpha), tumor growth factor-beta1 (TGF-beta1), interleukin (IL)-10, IL-6, and interferon-y (IFN-y) experiments were performed using polymerase chain reaction sequence-specific primers. RESULTS: The frequencies of IL-6-174GC genotype and IL-10 (-1082, -819, -592) GCC/ATA haplotype were …

Ileal Duplication In Adults, Sulhi A. Al-Sarem, Jehad S. Al-Shawi

Saudi Medical Journal

Alimentary tract duplications are rare anomalies usually present in childhood. They are most common in the ileum, but can occur anywhere along the alimentary tract from the mouth to the anus. We report a case of a 23-year-old female presented with severe epigastric and lower abdominal pain of one day duration, and was found to have perforated tubular ileal duplication communicating with the ileum on surgery.

Membranous Diaphragm Presenting As Esophageal Atresia In A Neonate, Saidul Islam, L. K. Shanbhogue

Saudi Medical Journal

Whenever a newborn infant presents with excessive salivation and failure to pass nasogastric tube, one of the 5 major types of esophageal atresia is suspected. We report a rare case where a newborn infant presented with features of esophageal atresia due to membranous diaphragm.