Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Physical Sciences and Mathematics (21)
- Chemistry (10)
- Medical Sciences (9)
- Medicine and Health Sciences (9)
- Pharmacology, Toxicology and Environmental Health (9)
-
- Applied Mathematics (8)
- Partial Differential Equations (3)
- Astrophysics and Astronomy (2)
- Environmental Sciences (2)
- Fresh Water Studies (2)
- Oceanography and Atmospheric Sciences and Meteorology (2)
- Physics (2)
- Animal Sciences (1)
- Aquaculture and Fisheries (1)
- Biochemistry, Biophysics, and Structural Biology (1)
- Botany (1)
- Cell and Developmental Biology (1)
- Genetics and Genomics (1)
- Microbiology (1)
- Molecular Biology (1)
- Other Cell and Developmental Biology (1)
- Plant Sciences (1)
- Institution
- Keyword
-
- Stability (4)
- Adults (3)
- Antibacterial (3)
- Juveniles (3)
- Population (3)
-
- Science Education (3)
- Size-structure (3)
- Steady State (3)
- Stenosis (3)
- Antibacterial activity (2)
- Antimicrobial (2)
- Antimicrobial activity (2)
- Antioxidant activity (2)
- Biological Sciences (2)
- Chesapeake Bay (2)
- Chromosomal anomalies (2)
- Drought (2)
- Endoxylanase (2)
- MIC (2)
- Malacosoma neustria NPV (2)
- Phytohormones (2)
- Retroviral vector (2)
- Turkey (2)
- Virus replication (2)
- Zea mays (2)
- 1894) (1)
- 7 h (1)
- A. chroococcum (1)
- Acquired Immune Deficiency Syndrome (1)
- Adventitious shoot regeneration (1)
Articles 1 - 30 of 80
Full-Text Articles in Biology
Remarks On The Stability Of Some Size-Structured Population Models V: The Case When The Death Rate Depends On Adults Only And The Growth Rate Depends On Size Only, M. El-Doma
Applications and Applied Mathematics: An International Journal (AAM)
We continue our study of size-structured population dynamics models when the population is divided into adults and juveniles, started in El-Doma (To appear). We concentrate our efforts in the special case when the death rate depends on adults only, the growth rate depends on size only and the maximum size for an individual in the population is infinite. Three demographic parameters are identified and are shown to determine conditions for the (in)stability of a nontrivial steady state. We also give examples that illustrate the stability results. The results in this paper generalize previous results, for example, see Calsina, et al. …
Two-Layered Model Of Blood Flow Through Composite Stenosed Artery, Padma Joshi, Ashutosh Pathak, B. K. Joshi
Two-Layered Model Of Blood Flow Through Composite Stenosed Artery, Padma Joshi, Ashutosh Pathak, B. K. Joshi
Applications and Applied Mathematics: An International Journal (AAM)
In this paper a steady, axisymmetric flow, with a constricted tube has been studied. The artery has been represented by a two-layered model consisting of a core layer and a peripheral layer. It has been shown that the resistance to flow and wall shear stress increases as the peripheral layer viscosity increases. The results are compared graphically with those of previous investigators. It has been observed that the existence of peripheral layer is useful in representation of diseased arterial system.
Remarks On The Stability Of Some Size-Structured Population Models Vi: The Case When The Death Rate Depends On Juveniles Only And The Growth Rate Depends On Size Only And The Case When Both Rates Depend On Size Only, M. El-Doma
Applications and Applied Mathematics: An International Journal (AAM)
We continue our study of size-structured population dynamics models when the population is divided into adults and juveniles, started in El-Doma (to appear 1) and continued in El-Doma (to appear 2). We concentrate our efforts in two special cases, the first is when the death rate depends on juveniles only and the growth rate depends on size only, and, the second is when both the death rate and the growth rate depend on size only. In both special cases we assume that the maximum size for an individual in the population is infinite. We identify three demographic parameters and show …
Remarks On The Stability Of Some Size-Structured Population Models Iv: The General Case Of Juveniles And Adults, M. El-Doma
Applications and Applied Mathematics: An International Journal (AAM)
The stability of some size-structured population dynamics models is investigated when the population is divided into adults and juveniles. We determine the steady states and study their stability. We also give examples that illustrate the stability results. The results in this paper generalize previous results, for example, see Calsina, et al. (2003), El-Doma (2006), Farkas, et al. (2008), and El-Doma (2008 a).
Pulsatile Flow Of Blood In A Constricted Artery With Body Acceleration, Devajyoti Biswas, Uday Shankar Chakraborty
Pulsatile Flow Of Blood In A Constricted Artery With Body Acceleration, Devajyoti Biswas, Uday Shankar Chakraborty
Applications and Applied Mathematics: An International Journal (AAM)
Pulsatile flow of blood through a uniform artery in the presence of a mild stenosis has been investigated in this paper. Blood has been represented by a Newtonian fluid. This model has been used to study the influence of body acceleration and a velocity slip at wall, in blood flow through stenosed arteries. By employing a perturbation analysis, analytic expressions for the velocity profile, flow rate, wall shear stress and effective viscosity, are derived. The variations of flow variables with different parameters are shown diagrammatically and discussed. It is noticed that velocity and flow rate increase but effective viscosity decreases, …
Phytoplankton Blooms: Their Occurrence And Composition Within Virginia's Tidal Tributaries, Harold G. Marshall, Todd A. Egerton
Phytoplankton Blooms: Their Occurrence And Composition Within Virginia's Tidal Tributaries, Harold G. Marshall, Todd A. Egerton
Virginia Journal of Science
Sporadic algal bloom development within a 10 year monitoring program in Virginia tidal tributaries of Chesapeake Bay is reviewed. These blooms were common events, characteristically producing a color signature to the surface water, typically short lived, occurring mainly from spring into autumn throughout different salinity regions of these rivers, and were produced primarily by dinoflagellates. The abundance threshold levels that would identify bloom status from a non-bloom presence were species specific, varied with the taxon's cell size, and ranged from ca. 10 to 104 cells mL-1. Among the most consistent sporadic bloom producers were the dinoflagellates Akashiwo …
First Records Of Hypleurochilus Geminatus And Centropristis Philadelphica From Chesapeake Bay, Aimee D. Halvorson
First Records Of Hypleurochilus Geminatus And Centropristis Philadelphica From Chesapeake Bay, Aimee D. Halvorson
Virginia Journal of Science
During the fall of 2007, Centropris philadelphica (rock seabass) and Hypleurochilus geminatus (Crested blenny) were collected from Chesapeake Bay. These captures are significant as they represent the first substantiated record of C. philadelphica from Chesapeake Bay and only the second and third validated records of H. geminatus. Additionally, the first record of H. geminatus from Chesapeake Bay was only recently recognized since the specimen had been previously misidentified as Parablennius marmoreus (seaweed blenny). The collection of seven individuals of H. geminatus in 2007, from two locations, indicates that the species may be resident within the Chesapeake Bay estuary.
Section Abstracts: Biology And Microbiology & Molecular Biology
Section Abstracts: Biology And Microbiology & Molecular Biology
Virginia Journal of Science
Abstracts of the Biology Section and Microbiology & Molecular Biology for the 87th Annual Meeting of the Virginia Academy of Science, May 27th-29th, 2009, Virginia Commonwealth University, Richmond, VA.
Effects Of Hematocrit On Impedance And Shear Stress During Stenosed Artery Catheterization, V. P. Srivastava, Rati Rastogi
Effects Of Hematocrit On Impedance And Shear Stress During Stenosed Artery Catheterization, V. P. Srivastava, Rati Rastogi
Applications and Applied Mathematics: An International Journal (AAM)
The flow of blood through a stenosed catheterized artery has been studied. To observe the effects of hematocrit, blood has been represented by a two-phase macroscopic model (i.e., a suspension of red cells in plasma). It is found that for any given catheter size, the impedance increases with hematocrit and also for a given hematocrit, the same increases with the catheter size. In the stenotic region, the wall shear stress increases in the upstream of the stenosis throat and decreases in the downstream in an uncatheterized artery but the same possesses an opposite character in the case of a catheterized …
Stability Of An Age-Structured Seir Epidemic Model With Infectivity In Latent Period, Xue-Zhi Li, Bin Fang
Stability Of An Age-Structured Seir Epidemic Model With Infectivity In Latent Period, Xue-Zhi Li, Bin Fang
Applications and Applied Mathematics: An International Journal (AAM)
We study an age-structured SEIR epidemic model with infectivity in the latent period. By using the theory and methods of Differential and Integral Equations, the explicit expression for the basic reproductive number R0 is first derived. It is shown that the disease-free equilibrium is locally and globally asymptotically stable if R0 < 1. It is then proved that only one endemic equilibrium exists if R0 > 1 and its stability conditions are also given.
Effect Of Glycocalyx On Red Blood Cell Motion In Capillary Surrounded By Tissue, Rekha Bali, Swati Mishra, P. N. Tandon
Effect Of Glycocalyx On Red Blood Cell Motion In Capillary Surrounded By Tissue, Rekha Bali, Swati Mishra, P. N. Tandon
Applications and Applied Mathematics: An International Journal (AAM)
The aim of the paper is to develop a simple model for capillary tissue fluid exchange system to study the effect of glycocalyx layer on the single file flow of red cells. We have considered the channel version of an idealized Krogh capillary-tissue exchange system. The glycocalyx and the tissue are represented as porous layers with different property parametric values. Hydrodynamic Lubrication theory is used to compute the squeezing flow of plasma within the small gap between the cell and the glycocalyx layer symmetrically surrounded by the tissue. The system of non linear partial differential equations has been solved using …
Seasonal Variation In Diet Of A Marginal Population Of The Hispid Cotton Rat, Sigmodon Hispidus, Lynn A. Walker, Robert K. Rose
Seasonal Variation In Diet Of A Marginal Population Of The Hispid Cotton Rat, Sigmodon Hispidus, Lynn A. Walker, Robert K. Rose
Virginia Journal of Science
Cotton rats live in oldfields, habitats with a variety of mostly herbaceous plants. Based on other studies, the hispid cotton rat, Sigmodon hispidus, eats many kinds of herbaceous plants but grasses predominate. In contrast, our population of cotton rats ate many monocots but mostly they were not grasses. Our study sought to determine the diet of the cotton rat in eastern Virginia, near the northern limit of distribution on the Atlantic Coast. Fecal samples, collected each month during an on-going capture-mark-release demographic study of the rodent community, were analyzed using a standard method. A greater variety of foods (including …
Graminicolous Fungi Of Virginia: Fungi In Collections 2004-2007, Curtis W. Roane
Graminicolous Fungi Of Virginia: Fungi In Collections 2004-2007, Curtis W. Roane
Virginia Journal of Science
Fungus-grass associations recognized in Virginia from 2004 to 2007 are recorded. Many associations are new to the United States (U), eastern United States (EU) and Virginia (V); other associations extend the known distribution of those previously discovered. These reports contribute further to knowledge of the mycoflora of Virginia.
A Standardized Rna Isolation Protocol For Yam (Dioscorea Alata L) Cdna Library Construction, Satya S. Narina, Ali I. Mohamed, Robert Asiedu, H. D. Mignouna
A Standardized Rna Isolation Protocol For Yam (Dioscorea Alata L) Cdna Library Construction, Satya S. Narina, Ali I. Mohamed, Robert Asiedu, H. D. Mignouna
Virginia Journal of Science
For the purpose of constructing yam cDNA libraries, attempts to isolate high quality RNA using several previously reported protocols were unsuccessful. Therefore a protocol was standardized for yam total RNA isolation by using guanidium buffer at the Department of Biology, Virginia State University. The RNA isolated using this standardized protocol was high in quality and led to successful good quality cDNA library construction and identification of functional ESTs in yam.
Management And Social Indicators Of Soil Carbon Storage In A Residential Ecosystem, Midlothian, Va, Christopher M. Gough, Eliza A. Fritz
Management And Social Indicators Of Soil Carbon Storage In A Residential Ecosystem, Midlothian, Va, Christopher M. Gough, Eliza A. Fritz
Virginia Journal of Science
Soil carbon storage- defined here as carbon mass per unit ground area- is an important ecosystem service, sequestering carbon that might otherwise exist in atmospheric CO2 . Significant attention has focused on the effects that humans have on carbon cycling, but little is known about how human behaviors and attitudes relate to lawn carbon storage. The objectives of this study were to conduct household surveys in concert with soil carbon sampling in a 10-year-old exurban neighborhood near Richmond, Virginia to quantify differences in soil carbon storage between residential lawns and mixed pine-hardwood forest fragments, and to determine how lawn …
Botulinum Toxin, David Moshayev
Botulinum Toxin, David Moshayev
The Science Journal of the Lander College of Arts and Sciences
Botulinum toxin is a neurotoxic protein produced by the bacterium Clostridium botulinum. Although botulinum toxin is the cause of the disease botulism and can be used in a terrorist attack, there are also many other uses for botulinum toxin. Botox, a derivative of botulinum toxin, is used for cosmetic purposes. Botulinum toxin is also used in medicines to control certain conditions marked by involuntary muscle contractions. The objective of this paper is to present a strong review of botulinum toxin so that one can see all the good and bad that is botulinum.
Biofilms In Medicine, Marshall Gelbman
Biofilms In Medicine, Marshall Gelbman
The Science Journal of the Lander College of Arts and Sciences
In 1862 Louis Pasteur introduced the “Germ Theory of Disease.” Subsequently the study of microbiology has flourished greatly and its medical significance has continuously grown. Many microbial organisms implicated in disease have been identified and studies. A general science of medical bacteriology has been determined and is widely taught. Such study has been largely based upon the activity of individual free-swimming (planktonic) cells and colonies that they form. However, microorganisms often form communities called biofilms which can have properties that very different from their planktonic predecessors. Biofilms are mucoid aggregates of microorganisms which tend to grow on surfaces exposed to …
Bisphosphonates And Osteonecrosis Of The Jaw, Chaya Leah Katz
Bisphosphonates And Osteonecrosis Of The Jaw, Chaya Leah Katz
The Science Journal of the Lander College of Arts and Sciences
Bisphosphonate-related Osteonecrosis of the Jaw (BRONJ) is a condition which, according to the American Association of Oral and Maxillofacial Surgeons (AAOMS), adversely affects between .8-12percent of the population, a small yet significant amount of adults. Osteonecrosis of the Jaw (ONJ) is characterized by the death of bone and suffering patients present with either a non-healing extraction socket or an exposed jawbone. In general, afflicted patients have been treated with a class of drugs known as the Bisphosphonates (BP). Bisphosphonates were originally developed in order to treat and manage many metastatic diseases of the bone and stabilize bone loss caused by …
The Effect Of Exercise On Alzheimer’S Disease, Benjamin Korman
The Effect Of Exercise On Alzheimer’S Disease, Benjamin Korman
The Science Journal of the Lander College of Arts and Sciences
Alzheimer’s disease (AD) is a progressive neurodegenerative disease, from which there is no recovery. It begins with impaired memory and judgement and progresses to the point where those affected can no longer care themselves. Although the cause of AD is unknown, two significant abnormalities occur in the brain of its victims: neurofibrillary tangles and amyloid plaques. It has been well established that exercise improves mood and general well-being, however this paper will focus on the effect of exercise on AD. It will show that exercise can improve physical functioning of an individual with AD, however more importantly it will focus …
Rhinoviruses: The Quest For A Cure, Michelle Gordon-Grunin
Rhinoviruses: The Quest For A Cure, Michelle Gordon-Grunin
The Science Journal of the Lander College of Arts and Sciences
Rhinoviruses, also known as Human Rhinovirus, abbreviated HRV, are one of the many causes of the common cold. In fact, around 50 percent of all cold are caused by rhinoviruses, with the other major candidates being coronaviruses, influenza A or B virus, and minor causative agents like parainfluenza virus, respiratory syncytial virus, adenovirus, and enterovirus (Makela and Puhakka, 1997). However, due to the complex molecular structure of rhinoviruses, a cure for the common cold caused by HRV is still in the making. Several new treatments have been discovered, impacting the virus as different stages of its life, hopefully to prevent …
Gestational Diabetes And Its Effects On The Fetus, Todd Pollack
Gestational Diabetes And Its Effects On The Fetus, Todd Pollack
The Science Journal of the Lander College of Arts and Sciences
Although the common effects of gestational diabetes on the fetus are known, the outcome of a diabetic gestation is ambiguous. There is concern for complications in the fetus at delivery due to enlarged size of the fetus, as well as concerns for birth defects, fetal distress, diabetes and obesity. Yet, although there is a correlation in the previous disorders and gestational diabetes, many of the mechanisms that cause these complications are unknown. By studying the pathology of gestational diabetes, researchers have learnt that the placenta controls fetal growth and provides a great deal of protection for the fetus. Therefore, many …
Botox And Its Effect On Wrinkles, Rochelle Eckstein
Botox And Its Effect On Wrinkles, Rochelle Eckstein
The Science Journal of the Lander College of Arts and Sciences
Clostridia Botulinum (C. Botulinum) is a bacterium that produces a unique exotoxin, botulinum toxin (BTX). BTX induces flaccid muscle paralysis by inhibiting the release of acetylcholine at the cholinergic nerve endings. Recently, Botox, developed from BTX, has become a popular solution to reduce the appearance of hyper-functional facial rhytids. Facial wrinkles are caused by repetitive muscle contraction, and a treatment that directly addresses this will be effective. Injections of Botox temporarily relax or paralyze these muscles. This paper will briefly discuss the bacterial basis of Botox and its development. It will explain how the mechanism of action of BTX can …
Insomnia: Its Causes, Its Consequences, And Its Cures, Shoshana Fried
Insomnia: Its Causes, Its Consequences, And Its Cures, Shoshana Fried
The Science Journal of the Lander College of Arts and Sciences
Insomnia is a complaint that affects almost all Americans at some point throughout their lives. However, only chronic insomnia is truly a disorder. This type of insomnia can be caused by various reasons, whether physiological, molecular, or psychological. This paper will elaborate on a number of possible causes for insomnia. Furthermore, this paper will present some of the many adverse effects that are caused by the sleep deprivation resulting from chronic insomnia. There are many possible treatments available to help against insomnia. This paper will explain 53 some of the behavioral methods. In addition, it will discuss the many different …
Full Issue: Volume 2, Number 1 Spring 2009
Full Issue: Volume 2, Number 1 Spring 2009
The Science Journal of the Lander College of Arts and Sciences
Complete .pdf file of Volume 2, Number 1 of The Science Journal of the Lander College of Arts and Sciences published Spring 2009.
Downregulation Of Hiv-1 Vif By A Hammerhead Ribozyme Expressed From A Retroviral Vector, Audrey M. Hendley, William Jackson
Downregulation Of Hiv-1 Vif By A Hammerhead Ribozyme Expressed From A Retroviral Vector, Audrey M. Hendley, William Jackson
Journal of the South Carolina Academy of Science
No abstract provided.
Synthesis Of Fatty Acid Binding Protein Inhibitors: A New Approach For Diabetes Treatment, Shekelia Baccus, M. Perry Davis Jr, David R. Magnin
Synthesis Of Fatty Acid Binding Protein Inhibitors: A New Approach For Diabetes Treatment, Shekelia Baccus, M. Perry Davis Jr, David R. Magnin
Journal of the South Carolina Academy of Science
No abstract provided.
Ultrasound In Second Year Pathology Medical Education, Richard Hoppmann, Wylie E. Michell, John B. Carter, Carol Mcmahon, Patsy H. Lill, Noel A. Brownlee, Kevin A. Carnevale
Ultrasound In Second Year Pathology Medical Education, Richard Hoppmann, Wylie E. Michell, John B. Carter, Carol Mcmahon, Patsy H. Lill, Noel A. Brownlee, Kevin A. Carnevale
Journal of the South Carolina Academy of Science
No abstract provided.
Effect Of Thaw Temperature On Murine Blastocyst Development, Heather M. Barton, H. Lee Higdon Iii, Ph.D., Jennifer E. Graves-Herring M.S., William R. Boone, Ph.D.
Effect Of Thaw Temperature On Murine Blastocyst Development, Heather M. Barton, H. Lee Higdon Iii, Ph.D., Jennifer E. Graves-Herring M.S., William R. Boone, Ph.D.
Journal of the South Carolina Academy of Science
No abstract provided.
Generation Of A Retroviral Vector That Expresses An Anti-Hiv-1 Tat Hammerhead Ribozyme, Lindsey E. Padgett, William H. Jackson
Generation Of A Retroviral Vector That Expresses An Anti-Hiv-1 Tat Hammerhead Ribozyme, Lindsey E. Padgett, William H. Jackson
Journal of the South Carolina Academy of Science
No abstract provided.
Where Do Mouse Embryos Thrive Best? Comparison Of Mammalian Embryo Development Under Varying Laboratory Environments, Yvonne K. Kao, H. Lee Higdon Iii, Ph.D, Jennifer E. Graves-Herring , M.S., William R. Boone Ph.D
Where Do Mouse Embryos Thrive Best? Comparison Of Mammalian Embryo Development Under Varying Laboratory Environments, Yvonne K. Kao, H. Lee Higdon Iii, Ph.D, Jennifer E. Graves-Herring , M.S., William R. Boone Ph.D
Journal of the South Carolina Academy of Science
No abstract provided.