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Articles 1 - 30 of 120
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The Principle Of Linearized Stability For Size-Structured Population Models, M. El-Doma
The Principle Of Linearized Stability For Size-Structured Population Models, M. El-Doma
Applications and Applied Mathematics: An International Journal (AAM)
The principle of linearized stability for size-structured population dynamics models is proved giving validity to previous stability results reported in, for example, El-Doma (2008-1). In particular, we show that if all the roots of the characteristic equation lie to the left of the imaginary axis then the steady state is locally exponentially stable, and on the other hand, if there is at least one root that lies to the right of the imaginary axis then the steady state is unstable. We also point out cases when there is resonance
The Dynamics Of Stage Structured Prey-Predator Model Involving Parasitic Infectious Disease, Raid K. Naji, Dina S. Al-Jaf
The Dynamics Of Stage Structured Prey-Predator Model Involving Parasitic Infectious Disease, Raid K. Naji, Dina S. Al-Jaf
Applications and Applied Mathematics: An International Journal (AAM)
In this paper a prey-predator model involving parasitic infectious disease is proposed and analyzed. It is assumed that the life cycle of predator species is divided into two stages immature and mature. The analysis of local and global stability of all possible subsystems is carried out. The dynamical behaviors of the model system around biologically feasible equilibria are studied. The global dynamics of the model are investigated with the help of Suitable Lyapunov functions. Conditions for which the model persists are established. Finally, to nationalize our analytical results, numerical simulations are worked out for a hypothetical set of parameter values.
Modeling Spread Of Polio With The Role Of Vaccination, Manju Agarwal, Archana S. Bhadauria
Modeling Spread Of Polio With The Role Of Vaccination, Manju Agarwal, Archana S. Bhadauria
Applications and Applied Mathematics: An International Journal (AAM)
In this paper, we have proposed and analyzed a nonlinear mathematical model for the spread of Polio in a population with variable size structure including the role of vaccination. A threshold parameter, R , is found that completely determines the stability dynamics and outcome of the disease. It is found that if R 1, the disease free equilibrium is stable and the disease dies out. However, if R >1, there exists a unique endemic equilibrium that is locally asymptotically stable. Conditions for the persistence of the disease are determined by means of Fonda’s theorem. Moreover, numerical simulation of the proposed …
Mathematical Modeling Of Peristaltic Flow Of Chyme In Small Intestine, Daniel N. Riahi, Ranadhir Roy
Mathematical Modeling Of Peristaltic Flow Of Chyme In Small Intestine, Daniel N. Riahi, Ranadhir Roy
Applications and Applied Mathematics: An International Journal (AAM)
Mathematical models based on axisymmetric Newtonian incompressible fluid flow are studied for the peristaltic flow of chyme in the small intestines, which is an axisymmetric cylindrical tube. The flow is modeled more realistically modeled by assuming that the peristaltic rush wave is a non-periodic mode composed of two sinusoidal waves of different wavelengths, which propagate at the same speed along the outer boundary of the tube. Both cases of flow in a tube and in an annulus that are modeled and investigated in the present paper correspond respectively to the cases of flow of chyme in the small intestine in …
2011 Meeting Missing Abstracts
2011 Meeting Missing Abstracts
Virginia Journal of Science
Abstracts not included in Virginia Journal of Science Volume 62, No. 1 and 2, presented at the 89th Annual Meeting of the Virginia Academy of Science, May 25-27, 2011, at the University of Richmond, Richmond VA.
Breeding Biology Of Oryzomys Palustris, The Marsh Rice Rat, In Eastern Virginia, Robert K. Rose, Erin A. Dreelin
Breeding Biology Of Oryzomys Palustris, The Marsh Rice Rat, In Eastern Virginia, Robert K. Rose, Erin A. Dreelin
Virginia Journal of Science
The objectives of our study were to determine the age of maturity, litter size, and the timing of the breeding season of marsh rice rats (Oryzomys palustris) of coastal Virginia. From May 1995 to May 1996, monthly samples of rice rats were live-trapped in two coastal tidal marshes of eastern Virginia, and then necropsied. Sexual maturity was attained at 30-40 g for both sexes. Mean litter size of 4.63 (N= 16) did not differ among months or in mass or parity classes. Data from two other studies conducted in the same county, one of them contemporaneous, also were …
A Cellular Automata Model Of Infection Control On Medical Implants, Alicia Prieto-Langarica, Hristo Kojouharov, Benito Chen-Charpentier, Liping Tang
A Cellular Automata Model Of Infection Control On Medical Implants, Alicia Prieto-Langarica, Hristo Kojouharov, Benito Chen-Charpentier, Liping Tang
Applications and Applied Mathematics: An International Journal (AAM)
S. epidermidis infections on medically implanted devices are a common problem in modern medicine due to the abundance of the bacteria. Once inside the body, S. epidermidis gather in communities called biofilms and can become extremely hard to eradicate, causing the patient serious complications. We simulate the complex S. epidermidis-Neutrophils interactions in order to determine the optimum conditions for the immune system to be able to contain the infection and avoid implant rejection. Our cellular automata model can also be used as a tool for determining the optimal amount of antibiotics for combating biofilm formation on medical implants.
Shooting Neural Networks Algorithm For Solving Boundary Value Problems In Odes, Kais I. Ibraheem, Bashir M. Khalaf
Shooting Neural Networks Algorithm For Solving Boundary Value Problems In Odes, Kais I. Ibraheem, Bashir M. Khalaf
Applications and Applied Mathematics: An International Journal (AAM)
The objective of this paper is to use Neural Networks for solving boundary value problems (BVPs) in Ordinary Differential Equations (ODEs). The Neural networks use the principle of Back propagation. Five examples are considered to show effectiveness of using the shooting techniques and neural network for solving the BVPs in ODEs. The convergence properties of the technique, which depend on the convergence of the integration technique and accuracy of the interpolation technique are considered.
Uptake Of Nanoparticles Of Cerium Oxide And Yttrium Oxide By Acanthamoeba Castellanii (Protozoa) And Daphnia Magna (Crustacea), James R. Palmieri, Geneva Gehring, Catherine Minichino, Shaadi F. Elswaifi
Uptake Of Nanoparticles Of Cerium Oxide And Yttrium Oxide By Acanthamoeba Castellanii (Protozoa) And Daphnia Magna (Crustacea), James R. Palmieri, Geneva Gehring, Catherine Minichino, Shaadi F. Elswaifi
Virginia Journal of Science
Currently, nanoparticles are synthesized and used at an unprecedented rate for industrial, medical, and research applications. The use of cerium oxide nanoparticles (CeONP) and yttrium oxide nanoparticles (YtONP) results in their spread as contaminants into the environment. Once in the environment, CeONP and YtONP can be taken up by organisms in the food chain where they may pose a public health risk. In this study we determine whether Acanthamoeba castellanii and Daphnia magna uptake CeONP or YtONP from their environment and thereby play a role in the transmission of the nanoparticles. Using electron microscopy, orgranisms exposed to the nanoparticles were …
Section Abstracts: Biology With Microbiology And Molecular Biology
Section Abstracts: Biology With Microbiology And Molecular Biology
Virginia Journal of Science
Abstracts of the Biology with Microbiology and Molecular Biology Section for the 89th Annual Meeting of the Virginia Academy of Science, May 25-27, 2011, University of Richmond, Richmond VA.
Section Abstracts: Natural History And Biodiversity
Section Abstracts: Natural History And Biodiversity
Virginia Journal of Science
Abstracts of the Natural History and Biodiversity Section for the 89th Annual Meeting of the Virginia Academy of Science, May 25-27, 2011, University of Richmond, Richmond VA.
Distributions And Abundances Of Microstegium Vimineum Along Forest Roadsides At The Grassy Hill Natural Area, Franklin County, Virginia, Gregory D. Turner
Distributions And Abundances Of Microstegium Vimineum Along Forest Roadsides At The Grassy Hill Natural Area, Franklin County, Virginia, Gregory D. Turner
Virginia Journal of Science
In summer 2005, plots were surveyed along roads passing through forest habitats at the Grassy Hill Natural Area Preserve in Franklin County, Virginia to assess the distributions and abundances of Microstegium vimineum in transects located at increasing distances away from roadsides into forest interiors. Across plots, Microstegium was encountered almost exclusively in roadside transects, where abundances were relatively high. While forest composition and topographic features were similar across plots, percent canopy cover and leaf litter depth were greater in interior compared to roadside transects due to undisturbed tree canopies and ground cover located in interior plot areas. Results imply that …
Biosolar Conversion Of N2 And H2o To Ammonia By Engineered N2-Fixing Cyanobacteria, Seth T. Harris
Biosolar Conversion Of N2 And H2o To Ammonia By Engineered N2-Fixing Cyanobacteria, Seth T. Harris
The Journal of Undergraduate Research
The cyanobacterium Anabaena sp. PCC 7120 is capable of using solar energy to produce ammonia through conversion of atmospheric dinitrogen in differentiated cells called heterocysts. Harnessing this system could enable cyanobacteria to be used in ammoniafertilizer production, creating a renewable alternative to the current Haber-Bosch process. The genes patA and alr3304 in the Anabaena 7120 genome are important in heterocyst formation; an increase in heterocyst formation is seen with over-expression of patA or inactivation of alr3304. This research aims to create a novel mutant that forms more heterocysts by simultaneously over-expressing patA and inactivating alr3304, producing higher amounts of ammonia. …
Preservation And Use Of Natural Resources In The Developing World: A Case Study Of The Can Gio Biosphere Reserve, Ho Chi Minh City, Vietnam, Emily Green
Occam's Razor
Developing nations often overlook the environmental effects of industrialization. However, these nations need healthy, sustainable resources in order to become prosperous and stable countries. Additionally, developed nations depend upon the natural resources of developing nations as raw materials. Loss of natural resources in developing nations therefore has effects at both national and global levels. A key challenge across the globe is balancing the human need for development with the necessity of the sustainable use and protection of natural resources. In the process of finding this balance, developing nations are revising both their national definition of conservation as well as the …
Occam's Razor Vol. 1 - Full (2011)
A Comparative Evaluation Of Antioxidant And Anticancer Activity Of Essential Oil From Origanum Onites (Lamiaceae) And Its Two Major Phenolic Components, Aysun Özkan, Ayşe Erdoğan
A Comparative Evaluation Of Antioxidant And Anticancer Activity Of Essential Oil From Origanum Onites (Lamiaceae) And Its Two Major Phenolic Components, Aysun Özkan, Ayşe Erdoğan
Turkish Journal of Biology
The objectives of the present study were to determine the effects of essential oil from Turkish oregano (Origanum onites L.) and its 2 major phenolic components, carvacrol and thymol, on cell viability, and to investigate their cytoprotective (antioxidant) effects against hydrogen peroxide-induced cytotoxicity and membrane damage in hepatoma G2 (Hep G2) cells. Their antioxidant properties were also evaluated with 2 in vitro complementary test systems: DPPH radical scavenging activity and linoleic acid oxidation inhibition. The aerial parts of the essential oil were isolated using a Clevenger-type apparatus (hydrodistillation) and its components were analyzed by gas chromatography/mass spectrometry (GC/MS). The essential …
President's Message, Justin K. Wyatt
President's Message, Justin K. Wyatt
Journal of the South Carolina Academy of Science
No abstract provided.
Scas Officers And Council Members 2010 - 2011
Scas Officers And Council Members 2010 - 2011
Journal of the South Carolina Academy of Science
No abstract provided.
Properties And Uses Of Sodium Titanates And Peroxotitanates, David Hobbs
Properties And Uses Of Sodium Titanates And Peroxotitanates, David Hobbs
Journal of the South Carolina Academy of Science
No abstract provided.
Applications Of Biotechnology In Development Of Biomaterials: Nanotechnology And Biofilms, Robin L. Brigmon, Christopher Berry, Raj N. Singh, Roger J. Narayan
Applications Of Biotechnology In Development Of Biomaterials: Nanotechnology And Biofilms, Robin L. Brigmon, Christopher Berry, Raj N. Singh, Roger J. Narayan
Journal of the South Carolina Academy of Science
No abstract provided.
Scas Officers And Council Members 2010-2011
Scas Officers And Council Members 2010-2011
Journal of the South Carolina Academy of Science
No abstract provided.
Gold Nanospheres As Inhibitors Of Amyloid- Β Protein Aggregation Involved In Alzheimer’S Disease, Mihyun Lim, Deborah Soto-Ortega, Rahina Mahtab, Melissa Moss
Gold Nanospheres As Inhibitors Of Amyloid- Β Protein Aggregation Involved In Alzheimer’S Disease, Mihyun Lim, Deborah Soto-Ortega, Rahina Mahtab, Melissa Moss
Journal of the South Carolina Academy of Science
No abstract provided.
Molecular Diversity Of Thermophilic Bacteria Isolated From Pasinler Hot Spring (Erzurum, Turkey), Ahmet Adigüzel, Kadri̇ye İnan, Fi̇kretti̇n Şahi̇n, Tüli̇n Arasoğlu, Medi̇ne Güllüce, Ali̇ Osman Beldüz, Özlem Bariş
Molecular Diversity Of Thermophilic Bacteria Isolated From Pasinler Hot Spring (Erzurum, Turkey), Ahmet Adigüzel, Kadri̇ye İnan, Fi̇kretti̇n Şahi̇n, Tüli̇n Arasoğlu, Medi̇ne Güllüce, Ali̇ Osman Beldüz, Özlem Bariş
Turkish Journal of Biology
The present study was conducted to determine the phenotypic and genotypic characterization of thermophilic bacteria isolated from Pasinler hot spring, Erzurum, Turkey. Fatty acid profiles, BOX PCR fingerprints, and 16S rDNA sequence data were used for the phenotypic and genotypic characterization of thermophilic bacteria. Totally 9 different bacterial strains were selected based on morphological, physiological, and biochemical tests. These strains were characterized by molecular tests including fatty acid and BOX profiles, and 16S rDNA sequence. The data of fatty acid analysis showed the presence of 14 different fatty acids in the 9 bacterial strains examined. Additionally, 5 of these fatty …
An Entomopathogenic Bacterium, Pseudomonas Putida, From Leptinotarsa Decemlineata, Hacer Muratoğlu, Zi̇hni̇ Demi̇rbağ, Kazim Sezen
An Entomopathogenic Bacterium, Pseudomonas Putida, From Leptinotarsa Decemlineata, Hacer Muratoğlu, Zi̇hni̇ Demi̇rbağ, Kazim Sezen
Turkish Journal of Biology
The Colorado Potato Beetle (CPB), Leptinotarsa decemlineata (Say) (Col.: Chrysomelidae), is a pre-eminent pest on solanaceous crops worldwide, and much research has focused on the different components of its variable population dynamics. L. decemlineata has developed resistance to insecticides used for its control. Consequently, alternative methods are needed urgently for the control of this pest. In this study, in order to find a more effective and safer biological control agent against L. decemlineata, we isolated a new bacterial isolate (Ld4) from L. decemlineata, and tested it for insecticidal effects on L. decemlineata larvae. Also, the insecticidal effect of Ld4 was …
Isolation And Identification Of Lactic Acid Bacteria From Boza, And Their Microbial Activity Against Several Reporter Strains, Meri̇h Kivanç, Meral Yilmaz, Erdoğan Çakir
Isolation And Identification Of Lactic Acid Bacteria From Boza, And Their Microbial Activity Against Several Reporter Strains, Meri̇h Kivanç, Meral Yilmaz, Erdoğan Çakir
Turkish Journal of Biology
A total of 45 lactic acid bacteria were isolated from 10 different boza samples consumed in Turkey. The isolates were identified with respect to colonial, cellular morphology, and biochemical characters based on API CHL50 (Biomérieux) kit and also automated riboprinting was used to identify of the isolates. These isolates were tested for inhibitory activity against food-borne bacterial pathogens. Antimicrobial effects of these lactic acid bacteria were determined by the agar spot test and also agar diffusion method. As a result of the RiboPrinter® Microbial Characterization System (DuPont Qualicon) lactic acid bacteria isolates having antimicrobial activity (45 isolates) were identified as …
Determining Mitotic Index In Peripheral Lymphocytes Of Welders Exposed To Metal Arc Welding Fumes, Ceylan Alakoç, Hali̇l Erhan Eroğlu
Determining Mitotic Index In Peripheral Lymphocytes Of Welders Exposed To Metal Arc Welding Fumes, Ceylan Alakoç, Hali̇l Erhan Eroğlu
Turkish Journal of Biology
Gas metal arc welding is a widely used method in a lot of industrial areas as it is cheap and produces high quality results. In the present study, peripheral blood lymphocytes of 23 welders and 25 non-exposed subjects were monitored for cytotoxicity. Information regarding the subjects' ages, smoking habits, alcohol consumption, duration of exposure, and medicine usage was recorded. According to the results, mitotic index (2.278 ± 1.325) of the welders was higher than that of those non-exposed (0.956 ± 0.616) (P < 0.01). There was no significant difference between mitotic index rates of smoking and non-smoking subjects. In contrast, there were significant differences between non-exposed subjects and welders for both smoking and non-smoking (P < 0.05). It was found that as the time of exposure to welding fumes increased so did the mitotic index rates (P < 0.05). Both a positive correlation in welders and a negative correlation in non-exposed subjects were observed between mitotic index frequency and age. In the light of the results obtained, it is advised that welders who work with gas metal arc welding be instructed and necessary protective measures be taken because of the risk caused by metal arc welding fumes.
The Protective Effect Of Boric Acid On Aluminum-Induced Hepatotoxicity And Genotoxicity In Rats, Hasan Türkez, Fati̇me Geyi̇koğlu, Suat Çolak
The Protective Effect Of Boric Acid On Aluminum-Induced Hepatotoxicity And Genotoxicity In Rats, Hasan Türkez, Fati̇me Geyi̇koğlu, Suat Çolak
Turkish Journal of Biology
The efficacy of boric acid (BA) was examined on liver marker enzymes in aluminum (Al)-treated rats. Also, a liver micronucleus assay was performed to evaluate the genotoxicity in hepatocytes. With these aims, Sprague-Dawley rats were randomly separated into 10 groups of 5 animals. Aluminum chloride (5 mg/kg body weight (b.w.) AlCl3) and BA (3.25, 13, 36 and 58.5 mg/kg b.w.) alone were administered with injections to the experimental animals. Furthermore, the animals were also treated with Al for 4 consecutive days followed by BA exposure for 10 days. The rats were anesthetized after Al and BA injections and the levels …
Antagonistic Potential Of Marine Actinobacteria Against Fish And Shellfish Pathogens, Selvakumar Dharmaraj
Antagonistic Potential Of Marine Actinobacteria Against Fish And Shellfish Pathogens, Selvakumar Dharmaraj
Turkish Journal of Biology
A total of 94 marine actinobacterial isolates were found to be associated with 4 sponges: Callyspongia diffusa, Mycale mytilorum, Tedania anhelans, and Dysidea fragilis. Among the cultures 7 strains showed antagonism against fish and shellfish pathogens. Analysis of morphological, physiological, biochemical, and protein profile characteristics suggested that the actinobacterial strains belonged to the genus Streptomyces. The initial screening of the isolates by the spot inoculation method exhibited antibacterial activity against Aeromonas hydrophila. In vitro screening of the submerged culture extracts showed positive inhibition against the fish and shellfish pathogens Aeromonas hydrophila, Serratia sp., and Vibrio spp. The screening of bioactive …
Comparative Analysis Of Dna Extracted From Fish Species Preserved In Formalin In Two Different Periods, Manickam Raja, Murugan Muralidharan, Muthukumarasamy Arunachalam
Comparative Analysis Of Dna Extracted From Fish Species Preserved In Formalin In Two Different Periods, Manickam Raja, Murugan Muralidharan, Muthukumarasamy Arunachalam
Turkish Journal of Biology
DNA was extracted from 2 cyprinid fishes kept under formalin preservation in 2 different time durations, and the quality and quantity were analyzed. The tissue samples from specimens preserved for shorter duration yielded higher quantity of DNA compared to long-term preserved tissues. ANOVA (one way) on the quantity of the DNA from the samples of 2 periods showed that the genetic material obtained from the recently preserved samples was highly significant (P > 0.001). The quality of the genetic material irrespective of the period of preservation was found to be the same. The purpose of the study was to check the …
Determination Of Antimicrobial And Antiproliferative Activities Of The Aquatic Moss Fontinalis Antipyretica Hedw., Fi̇li̇z Savaroğlu, Cansu Fi̇li̇k İşçen, Ayşe Pinar Öztopcu Vatan, Selda Kabadere, Semra İlhan, Ruhi̇ Uyar
Determination Of Antimicrobial And Antiproliferative Activities Of The Aquatic Moss Fontinalis Antipyretica Hedw., Fi̇li̇z Savaroğlu, Cansu Fi̇li̇k İşçen, Ayşe Pinar Öztopcu Vatan, Selda Kabadere, Semra İlhan, Ruhi̇ Uyar
Turkish Journal of Biology
The purpose of the current study was to investigate the possible antimicrobial and anticancer properties of the aquatic moss Fontinalis antipyretica Hedw. (Fontinalaceae). We first obtained 8 different extracts (methanol; chloroform; acetone; ethyl acetate A, B, C, and D) by two different extraction processes. The antimicrobial activity of these extracts was then assessed by using the well diffusion method against 8 bacterial and 7 fungal strains. The results of antimicrobial studies showed that extracts of chloroform, acetone, and ethyl acetate A and C were active against almost all the species tested. The most effective extract was C, which was then …