Digital Commons Network^™

Filtering Efficiency And Feeding Mechanisms Of Daphnia Pulex On Microcystis Aeruginosa And Nannochloropsis, Elizabeth Orlowicz

Honors Theses and Capstones

The filtering and feeding rate of Daphnia pulex from the Old Durham Reservoir, Durham, NH, were measured to determine the feeding efficiency on different concentrations of non-toxic Nannochloropsis (Class Eustigmatophyceae) and toxigenic cyanobacteria Microcystis aeruginosa. Direct observations of thoracic appendage beats and post-abdominal rejections were also measured at 5*10⁵ and 10⁶ cells mL^-1 concentrations of Nannochloropsis and M. aeruginosa to examine the feeding mechanisms of the D. pulex. In the presence of increasing Nannochloropsis concentrations, the filtering rates decreased and the feeding rates increased. When exposed to M. aeruginosa, both the filtering and feeding …

Colonial Figures: Memories Of Street Traders In The Colonial And Early Post-Colonial Periods, Sheri Lynn Gibbings, Fridus Steijlen

Global Studies Faculty Publications

This article explores post-colonial memories about street traders among individuals who lived in the former colony of the Dutch East Indies. It argues that these narratives romanticize the relationship between Europeans and indigenous peoples. Street vendors are also used to differentiate between periods within colonial and post-colonial history. The nostalgic representation of interracial contact between Europeans and traders is contrasted with representations of other figures such as the Japanese and the nationalist. A recurring feature of these representations is the ability of Europeans to speak with street traders and imagine what they wanted and needed. The traders are remembered as …

Ict Skills And Computer Self-Efficacy Of Research Students: The Case Of Institute Of Pure & Applied Biology And Biotechnology, Bahauddin Zakariya University, Multan, Pakistan, Muhammad Naushad Sabzwari, Rubina Bhatti, Bashir Ahmed

Library Philosophy and Practice (e-journal)

In the current changing higher education environment research students need to possess ample skills related to use of computer and different ICTs for education and research purposes. This study aims to investigate the awareness, usage and impact of information and communication technologies (ICTs) for information, education and research purposes among the Botany, Zoology and Biotechnology research students of Bahauddin Zakariya University, Multan. For this purpose, data was collected from students involved in research, in order to get information and awareness about their competencies and skills in ICT and other searching and data analyzing tools. The literature review shows that most …

12/28/2012 Obituary Records, Hawaii Obituaries

Obituaries

List of Obituaries for individuals who passed away on 12/28/2012. Scroll down to see the names and obituary description.

Students’ Science Knowledge As A Constraint In Developing Interests In Science Studies Among Secondary School Learners In Tanzania, John F. Kalolo, Eugenia J. Kafanabo

Journal of Humanities and Social Sciences

The paper examines how students’ science knowledge is a constraint in developing interests in science studies. There are three objectives that guided the study on which this paper is based: examining student’s background knowledge about science and its related careers; assessing student’s awareness on science related professions; and examining the availability of various sources of science knowledge in schools for developing interest in science subjects in secondary schools. A total of 246 respondents participated in the study; and these included 60 teachers, 180 students and 6 heads of schools. The data were collected through questionnaire, interview, focus group discussion, and …

The Role Of Heads Of Departments In Enhancing The Quality Of Education In Secondary Schools In Tanzania, Perpetua J. Urio

Journal of Humanities and Social Sciences

Heads of department are perceived as instructional leaders. This paper is based on a study that aimed to find out how heads of departments in Tanzanian secondary schools deal with their tasks in enhancing the quality of education, and the support accorded to them by the school administrative system in the performance of their duties. The study was conducted in Arusha and Coast regions, comprising a sample of 72 respondents from eight secondary schools. Data were collected through interviews, questionnaires and documentary review. Data collected were subjected to content analysis and numerical data were summarized into tables. Findings revealed that, …

Development Of Information And Communication Technology In Education In Tanzania: How Is Duce Playing Its Role?, Josta L. Nzilano, Ayoub C. Kafyulilo

Journal of Humanities and Social Sciences

This paper presents the ICT integration situation in Tanzania, and the efforts that are being made by the Dar es Salaam University College of Education (DUCE), as a teacher training institution, to have ICT integrated in the education system at the college and country at large. Over 60 articles and reports were gathered and read in the process of writing the paper. However, through rigorous review of each article only 35 were found to match best with the goal of this study. Results from literature indicate that technology integration in the country was still at an infant stage. Most educational …

Variation In Job Satisfaction Between Public And Private Secondary School Teachers In Tanzania: A Comparative Study At Kinondoni District, Faustine B. Masath

Journal of Humanities and Social Sciences

In improving the quality of education in secondary schools, teachers’ job satisfaction is vital and an inevitable component. In Tanzania, however, the level of job satisfaction of secondary school teachers is not clear; and so is how public and private secondary schools differ in their level of job satisfaction. This paper aims to compare the level of job satisfaction between public and private secondary school teachers. The paper is based on a descriptive cross-sectional survey research design, which employed a sample of 275 respondents from 10 selected secondary schools in Kinondoni district. Teacher Job Satisfaction Scale (TJSS) and documentary review …

An Inquiry Into The Political Correctness In Swahili And Mashami Traditions, Benedictor Phanuel Lema

Journal of Humanities and Social Sciences

Political correctness evidences naturally evolving socio-political and economic dynamics that are constantly in force. This paper shows that political correctness, viewed from the perspective of the seemingly socio-cultural readjustments, needs to be understood from the underlying socio-cultural and political forces that are strongly embedded in the social structures. Borrowing from Swahili and Mashami cultures, this paper shows differences in the way they neutralize unfriendly terms, particularly in events where the labelling is a result of the work of God and naturally imposed calamities. It establishes that whereas Swahili culture seems to be rude in the eyes of the activists in …

Applications Of Weak Ion Association Between Symmetrical Tetraalkylammonium Ions And Inorganic Anions, Julius Mbuna

Journal of Humanities and Social Sciences

Interactions between tetraalkylammonium ions and inorganic anions can be used to develop methods of separation for inorganic anions by any separation technique. From the ion association and thermodynamic data, capillary electrophoretic (CE) technique can be easily designed to effect separation of inorganic anions samples. Using CE mode such as capillary zone electrophoresis (CZE) to investigate weak ion association between inorganic anions and the pairing cations also furnishes data to evaluate association theories like Bjerrum’s theory. Findings show that the increase in association constant Kass as the dielectric constant decreased is not exponential as maintained by the Bjerrum’s theory. The increase …

Advances And Challenges Of Intermediate Temperature Solid Oxide Fuel Cells: A Concise Review, Sanping Jiang

Journal of Electrochemistry

Fuel cell is an electrochemical energy conversion device to directly convert the chemical energy of fuels to electricity. Among all types of fuel cells, solid oxide fuel cells (SOFCs) operating at intermediate temperatures of 600~800 ^oC offer an attractive option that is much more fuel flexible than low temperature fuel cells such as proton exchange membrane fuel cells, and is suitable for a wide range of applications. However, two main challenges remain towards the commercial viability and acceptance of the SOFC technologies: the cost and durability. Both are critically dependent on the process, fabrication, performance, chemical and microstructural stability …

Ternary Alloy Electrocatalysts For Oxygen Reduction Reaction, Jin Luo, Lefu Yang, Binghui Chen, Chuanjian Zhong

Journal of Electrochemistry

Proton exchange membrane fuel cell represents an important electrochemical energy conversion device with many attractive features in terms of efficiency of energy conversion and minimization of environmental pollution. However, the large overpotential for oxygen reduction reaction at the cathode and the low activity, poor durability and high cost of platinum-based catalysts in the fuel cells constitute a focal point of major barriers to the commercialization of fuel cells. The development of nanostructured catalysts shows promises to addresses some of the challenging problems. The ability to engineer the composition and nanostructure of nanoalloy catalysts is important for developing active, robust and …

Electrocatalytic Activity Of Palladium Nanocatalysts Supported On Carbon Nanoparticles In Formic Acid Oxidation, Jie Huang, Zhiyou Zhou, Yang Song, Xiongwu Kang, Ke Liu, Wancheng Zhou, Shaowei Chen

Journal of Electrochemistry

Palladium nanostructures were deposited onto carbon nanoparticle surface by a chemical reduction method. Transmission electron microscopic studies showed that whereas the resulting metal-carbon (Pd-CNP) nanocomposites exhibited a diameter of 20 to 30 nm, the metal components actually showed a cauliflower-like surface morphology that consisted of numerous smaller Pd nanoparticles (3 to 8 nm). Electrochemical studies showed that the effective surface area of the Pd-CNP nanoparticles was about 40% less than that of Pd black, possibly because the Pd nanoparticles were coated with a layer of carbon nanoparticles; yet, the Pd-CNP nanocomposites exhibited marked enhancement of the electrocatalytic activity in formic …

Electrocatalytic Oxidation Of Formic Acid On Pd/Ni Heterostructured Catalyst, Mingjun Ren, Liangliang Zou, Ju Chen, Ting Yuan, Qinghong Huang, Haifeng Zhang, Hui Yang, Songlin Feng

Journal of Electrochemistry

A Pd/Ni bimetallic nanostructured electrocatalyst was fabricated via a two-step reduction route. Owing to an epitaxial growth of Pd atoms on the surface of Ni nanoparticles, heterostructured Pd/Ni nanocomposites were formed and verified by high resolution transmission electron microscopy combined with energy-dispersion X-ray spectroscopy. X-ray diffraction confirmed that the as-prepared Pd/Ni nanocomposites possessed a single face-centered-cubic (fcc) Pd structure, probably due to a weaker diffraction intensity of metallic Ni and/or overlapping by that of Pd. The intrinsic catalytic activity on the Pd/Ni is higher than that on the Pd. Moreover, the durability of formic acid oxidation on the Pd/Ni was …

Adsorption And Electrooxidation Of Carbon Monoxide On Platinum Surfaces Modified With Sulfur, A. Mattox Mathew, W. Henney Matthew, Johnson Adam, Zou Shouzhong

Journal of Electrochemistry

Adsorbed sulfur is commonly considered as a reaction poison. However, small amounts of sulfur on platinum significantly increase the surface reactivity toward carbon monoxide (CO) electrooxidation. For the solution CO oxidation, the onset potential was shifted up to over 300 mV negative to that on S-free surface, and the extent of the negative potential shift increases with the sulfur coverage (X_s) up to about 0.6. The enhanced CO oxidation also depends on the solution pH. For the adsorbed CO, at low sulfur coverages (X_s < 0.3), the oxidation peak potential is about 40 mV negative to that of the corresponding clean Pt. However, at higher coverages, the peak potential is about 30 mV more positive. Surface-enhanced Raman spectra show that the adsorption of sulfur significantly redshifts the Pt-CO stretching frequency. These observations are explained by the weakening of the Pt-CO bond and the hindrance of CO diffusion by Sads.

Kinetic Study Of Photoelectrochemical Oxidation Of Lignin Model Compounds On Tio2 Nanotubes, Min Tian, Daniel Liba, Aicheng Chen

Journal of Electrochemistry

In this study, TiO₂ nanotubes were prepared via the electrochemical oxidation of titanium substrates in a non-aqueous electrolyte and their morphology and microstructures were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The photoelectrochemical oxidation of two lignin model compounds, 1-(3,4-dimethoxyphenoxy)-2-(2-methoxyphenoxy)-1,3-propanediol (DMP) and 3-hydroxy-1-(3,4-dimethoxyphenoxy)-2-(2-methoxyphenoxy)-1,3-propanone (HDM), was investigated. A new band appeared at ~304 nm during the photoelectrochemical oxidation of DMP. The rate of DMP intermediate formation was amplified with the increase of initial concentrations, while it was diminished with increased temperature. Despite the similarity in structure between HDM and DMP, there are only small increases in absorbance …

Electrochemical Performance Of Screen-Printed Composite Coatings Of Conducting Polymers And Carbon Nanotubes On Titanium Bipolar Plates In Aqueous Asymmetrical Supercapacitors, Xiaohang Zhou, George Z. Chen

Journal of Electrochemistry

Composites of conducting polymers (polypyrrole and polyaniline) with acid treated multi-walled carbon nanotubes were formulated into printable aqueous inks, with the aid of functional additives (benzethonium chloride as a surfactant with or without polyvinyl alcohol as a binder). The inks were screen-printed as fairly uniform coatings of various mass loading densities and areas (up to 75 mg cm^-2 and 100 cm²) on thin titanium plates (0.1 mm in thickness). These screen-printed plates were used to fabricate both unit cell and multi-cell stack of asymmetrical supercapacitors with screen-printed negative electrodes of activated carbon (pigment black) in aqueous electrolytes …

Orofacial Neuropathic Pain Mouse Model Induced By Trigeminal Inflammatory Compression (Tic) Of The Infraorbital Nerve, Fei Ma, Liping Zhang, Danielle Lyons, Karin N. Westlund

Physiology Faculty Publications

BACKGROUND: Trigeminal neuropathic pain attacks can be excruciating for patients, even after being lightly touched. Although there are rodent trigeminal nerve research models to study orofacial pain, few models have been applied to studies in mice. A mouse trigeminal inflammatory compression (TIC) model is introduced here which successfully and reliably promotes vibrissal whisker pad hypersensitivity.

RESULTS: The chronic orofacial neuropathic pain model is induced after surgical placement of chromic gut suture in the infraorbital nerve fissure in the maxillary bone. Slight compression and chemical effects of the chromic gut suture on the portion of the infraorbital nerve contacted cause mild …

Moore V. State Respondent's Brief Dckt. 39523

Not Reported

No abstract provided.

State V. Parmer Appellant's Brief Dckt. 39203

Not Reported

No abstract provided.

Src Activation By Β-Adrenoreceptors Is A Key Switch For Tumor Metastasis, Guillermo N. Armaiz-Pena, Julie K. Allen, Anthony Cruz, Rebecca L. Stone, Alpa M. Nick, Yvonne G. Lin, Liz Y. Han, Lingegowda S. Mangala, Gabriel J. Villares, Pablo Vivas-Mejia, Cristian Rodriguez-Aquayo, Archana S. Nagaraja, Kshipra M. Gharpure, Zheng Wu, Robert D. English, Kizhake V. Soman, Mian M. K. Shazhad, Maya Zigler, Michael T. Deavers, Alexander Zien, Tom Young

Publications and Research

Norepinephrine (NE) can modulate multiple cellular functions important for cancer progression; however, how this single extracellular signal regulates such a broad array of cellular processes is unknown. Here, we identify Src as a key regulator of phosphoproteomic signaling networks activated in response to beta-adrenergic signaling in cancer cells. These results also identify a new mechanism of Src phosphorylation that mediates beta-adrenergic/PKA regulation of downstream networks, thereby enhancing tumor cell migration, invasion and growth. In human ovarian cancer samples, high tumoral NE levels were correlated with high pSrcY419 levels. Moreover, among cancer patients, the use of beta blockers was significantly associated …

Prevalence And Risk Factors For Congenital Anomalies In Mosul City, Zhraa Abd-Alkader Taboo

Iraqi Postgraduate Medical Journal

ABSTRACT: BACKGROUND: Congenital anomalies define as abnormalities of body structure that originated before birth, about 3% of all children are born with a serious structural defect that interferes with normal body function and can lead to lifelong handicap or even early death. There is a variation in the frequency of congenital anomalies in different populations. OBJECTIVE: To determine the prevalence of the easily identifiable congenital anomalies also to estimate the risk factors which may predispose to anomalies and pattern of distribution of congenital anomalies of newborn in Mosul city. METHODS: In a cross-sectional study, charts of forty six thousand and …

Pregnancy With Stroke, Abathar Qahtan

Iraqi Postgraduate Medical Journal

ABSTRACT: BACKGROUND: Although stroke in pregnancy is uncommon, the risk of stroke is increased during pregnancy and puerperium, and considered a major contributor to the serious morbidity and mortality of pregnancy OBJECTIVE: This study had been designed to find the frequency of stroke in relation to different periods of pregnancy and puerperium, to assess the effect of variable risk factors and their association with stroke and to verify which type of stroke is more frequent among pregnant ladies METHODS : This is a cross sectional study that enrolled 30 pregnant patients who had stroke either during pregnancy or puerperium and …

Normative Data Of Needle Electromyography, What Is Different In Iraqi Patients, Hasan Azeez Al-Hamadani, Zainulabdeen Abdulsamad Mahdi, Farah Al-Saffar, Atheer Sabah Fayahd

Iraqi Postgraduate Medical Journal

ABSTRACT: BACKGROUND: The electrodiagnostic studies are useful adjuncts to the clinical examination of the peripheral nervous system. Electromyography (EMG) records the physiologic status of muscle function. Needle electromyography help localize abnormalities along peripheral nerves or lower motor neurons. OBJECTIVE: To establish the normal electrophysiological values of the common upper and lower limbs muscles in sample of healthy adult population in Iraq using standard temperature control, and to compare with those data published in other studies. MATERIAL AND METHODS: This is a cross sectional study conducted in Al-Kadhmiya Teaching Hospital during the period from July 2008 to December 2009. The study …

Evaluation Of Functional Outcome After Open Reduction And Internal Fixation Of Capitellar Fracture With K. Wires, Adnan Husain Hnoosh

Iraqi Postgraduate Medical Journal

ABSTRACT : BACKGROUND : Isolated capitellar fractures are uncommon. Authors continue to differ about the preferred method of treatments and it's results on the post operative outcome. OBJECTIVE: Of This study: Is to evaluate the clinical and functional out come of operatively treated capitellar fracture with K.Wire , and furthermore to define the impact of fracture type on the out come. PATIENTS AND METHOD: A retrospective study carried out on 15 patients Sustaind closed capitellar fracture , 11 females , 4 males. The main age (16 – 58 years). the Operative treatment performed at a mean of 10 days, by …

Correlations Between Preoperative Measurement Of Prostate Volume By Transabdominal And Transrectal Ultrasound With Open Prostatectomy, Auda Hassan Ali Al.Jabbiri, Mohanad M.H. Al-Saed, Usama S. Al.Nasiri

Iraqi Postgraduate Medical Journal

ABSTRACT: BACKGROUND: Despite being formally included in the assessment of patients presenting with lower urinary tract symptoms (LUTS), transrectal ultrasonography (TRUS) is not routinely offered to these patients. Data exist on the superiority of TRUS over transabdominal ultrasound in accurately predicting prostate volume. OBJECTIVE: To evaluate which of these methods are more accurate in calculation of prostate volume. The volume is most commonly measured using the formula, prostate volume=height×width×length /6, which is derived considering the gland as ellipsoid, PATIENTS AND METHODS: Thirty five patients aged (60-75) years; with mean age (65.1±4.016) years and mean of serum prostate specific antigen (PSA) …

Morc2 Signaling Integrates Phosphorylation-Dependent, Atpase-Coupled Chromatin Remodeling During The Dna Damage Response, Da-Qiang Li, Sujit S. Nair, Kazufumi Ohshiro, Anupam Kumar, Vasudha S. Nair, Suresh B. Pakala, Sirigiri Divijendra Natha Reddy, Rajendra P. Gajula, Jeyanthy Eswaran, L. Aravind, Rakesh Kumar

Biochemistry and Molecular Medicine Faculty Publications

Chromatin dynamics play a central role in maintaining genome integrity, but how this is achieved remains largely unknown. Here, we report that microrchidia CW-type zinc finger 2 (MORC2), an uncharacterized protein with a derived PHD finger domain and a conserved GHKL-type ATPase module, is a physiological substrate of p21-activated kinase 1 (PAK1), an important integrator of extracellular signals and nuclear processes. Following DNA damage, MORC2 is phosphorylated on serine 739 in a PAK1-dependent manner, and phosphorylated MORC2 regulates its DNA-dependent ATPase activity to facilitate chromatin remodeling. Moreover, MORC2 associates with chromatin and promotes gamma-H2AX induction in a PAK1 phosphorylation-dependent manner. …

Best Of 2012 ― #5: Physicists' Use Of Black Hole Studies To Measure Photon Mass Published In Physical Review Letters, Edwin Smith

University of Mississippi News

No abstract provided.

Testing Diagnostics Of Nuclear Activity And Star Formation In Galaxies At Z > 1, Jonathan R. Trump, Nicholas P. Konidaris, Guillermo Barro, David C. Koo, Dale D. Kocevski, Stéphanie Juneau, Benjamin J. Weiner, S. M. Faber, Ian S. Mclean, Renbin Yan, Pablo G. Pérez-González, Victor Villar

Physics and Astronomy Faculty Publications

We present some of the first science data with the new Keck/MOSFIRE instrument to test the effectiveness of different AGN/SF diagnostics at z ~ 1.5. MOSFIRE spectra were obtained in three H-band multi-slit masks in the GOODS-S field, resulting in 2 hr exposures of 36 emission-line galaxies. We compare X-ray data with the traditional emission-line ratio diagnostics and the alternative mass-excitation and color-excitation diagrams, combining new MOSFIRE infrared data with previous HST/WFC3 infrared spectra (from the 3D-HST survey) and multiwavelength photometry. We demonstrate that a high [O III]/Hβ ratio is insufficient as an active galactic nucleus (AGN) indicator …

The Weekly Challenger, December 27, 2012, The Weekly Challenger, Et Al

Weekly Challenger Newspaper Collection

The December 27, 2012, issue of The Weekly Challenger.