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Articles 1 - 30 of 119
Full-Text Articles in Biology
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
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 …
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 …
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 …
Scoliosis: Comparative Analysis Of Surgery Vs. Brace Treatment, Jerry Frenkel
Scoliosis: Comparative Analysis Of Surgery Vs. Brace Treatment, Jerry Frenkel
The Science Journal of the Lander College of Arts and Sciences
The following is the introduction of this article: The spine, or spinal column, as it is also called, is a complex structure made up of 33 vertebrae (bone segments) arranged vertically in succession from just below the skull to the tailbone. The entire column is broken up into various classes of vertebrae named, from superior to inferior, as cervical, thoracic, lumbar, sacral, and coccygeal. Different forms of spinal deformities that can occur include kyphosis, lordosis and scoliosis (Neuwirth and Osborn 2001). Scoliosis is defined simply in medical terms as a lateral three-dimensional irregular curvature of the spine. The curvature as …
Full Issue: Volume 5, Number 1, Fall 2011
Full Issue: Volume 5, Number 1, Fall 2011
The Science Journal of the Lander College of Arts and Sciences
No abstract provided.
Full Issue: Volume 4, Number 2
Full Issue: Volume 4, Number 2
The Science Journal of the Lander College of Arts and Sciences
No abstract provided.
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)
Production, Purification, And Characterization Of \Alpha-Amylase By Bacillus Subtilis And Its Mutant Derivates, Eli̇f Demi̇rkan
Production, Purification, And Characterization Of \Alpha-Amylase By Bacillus Subtilis And Its Mutant Derivates, Eli̇f Demi̇rkan
Turkish Journal of Biology
The effects of various carbon and nitrogen sources on production of \alpha-amylase by Bacillus subtilis and its mutant derivates were investigated. The maximum production of \alpha-amylase by all strains was obtained in the presence of mesoinositol as the carbon source. There was no more significant increase in enzyme yield in the case of the supplementation of nitrogen sources, whereas malt extract and tryptone were preferred nitrogen sources for amylase production by Bacillus subtilis and mutant U 2-6 strain, respectively. \alpha-Amylases of B. subtilis and its mutant strain (EBUE 5-3) were purified through a series of steps, and characterized. The optimum …
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.
Table Of Contents
Journal of the South Carolina Academy of Science
No abstract provided.
Inverse Correspondence Of Amh And Fsh Levels In Women Presenting For Infertility Treatments, Amara Iverson, Abdelmonium Younis, William Butler, William Roudebush
Inverse Correspondence Of Amh And Fsh Levels In Women Presenting For Infertility Treatments, Amara Iverson, Abdelmonium Younis, William Butler, William Roudebush
Journal of the South Carolina Academy of Science
No abstract provided.
Advertisement Call And Distribution Of The Treefrogs Hyla Chrysoscelis And Hyla Versicolor In Virginia, Joseph C. Mitchell, Christopher A. Pague
Advertisement Call And Distribution Of The Treefrogs Hyla Chrysoscelis And Hyla Versicolor In Virginia, Joseph C. Mitchell, Christopher A. Pague
Virginia Journal of Science
The gray treefrog complex consists of two sibling species that are indistinguishable morphologically, the diploid Hyla chrysoscelis and the tetraploid Hyla versicolor. Identification is possible in the field only by audio recognition of male advertisement call trill rates (pulses/second). During 1979-1983 we evaluated taped calls of these two species taken from 89 populations from throughout Virginia to map their respective ranges and to evaluate differences in call parameters. Hyla chrysoscelis occurs in the Coastal Plain, eastern and southern Piedmont, and in southwestern Virginia. Hyla versicoloroccurs in the Piedmont, Blue Ridge, and Ridge and Valley regions south to Wythe …
Evaluation Of The Antioxidant And Acetylcholinesterase Inhibitory Activities Of Arnebia Densiflora Ledeb., İlkay Orhan, F. Sezer Şenol, Ufuk Koca, Tuğba Erçeti̇n, Gülnur Toker
Evaluation Of The Antioxidant And Acetylcholinesterase Inhibitory Activities Of Arnebia Densiflora Ledeb., İlkay Orhan, F. Sezer Şenol, Ufuk Koca, Tuğba Erçeti̇n, Gülnur Toker
Turkish Journal of Biology
Arnebia densiflora Ledeb. (Boraginaceae), a medicinal plant growing in Turkey, has been reported to contain a well-known red pigment, shikonin, a naphthoquinone derivative. In the current study, the acetylcholinesterase (AChE) inhibitory and antioxidant activities of the chloroform, ethyl acetate, methanol, and water extracts of the root, stem, and flowers of the plant, as well as shikonin, were investigated. AChE inhibition was tested using an ELISA microplate reader at 250, 500, 1000, and 2000 µg mL^{-1}. Antioxidant activity was determined by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging test and the Fe+2-ferrozine test system for metal chelating power. The results indicated that the …