Invasion by nonnative brook trout (Salvelinus fontinalis) often results in replacement of bull trout (Salvelinus confluentus) in western North America, but the causal mechanisms are not well understood. Removal of brook trout from 1992 to 2000 from Sun Creek in southern Oregon, provided an opportunity to investigate the changes in...
With the economic globalization, the consumption demand of Chinese residents has changed gradually. The paper analyzes consumption tendency of Chinese residents from two aspects, those are per capital consumption level and consumption characteristics. On the one side, per capita ownership of fish and fishery products of China is above the...
Full Text:
INFLUENCE OF ECONOMIC GLOBALIZATION TO
SEAFOOD CONSUMPTION DEMAND OF CHINESE
RESIDENTS
SUN Chen
The response of cells to periodic driving is important for many biological processes, particularly blood flow and heart functioning. Our research analyzes the collective shear stress response of fibroblast cells due to a periodic driving frequency. When cells experience shear stress, they release calcium into the cytosol. To quantify the...
Revised April 1956. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Instance segmentation, the classification and localization of objects in an image, is a problem in cellular biophysics due to the physiological relevance of cell morphology. Particularly, cancer cells migrate in tissue space by changing their body shape similarly to how humans extend their limbs to swim through water. Monitoring such...
Many biological processes are regulated by the presence and movement of cellular Ca²⁺ ions. The concentration of Ca²⁺ in a cellular environment is regulated by IP₃ sensitive channels that lie on the surface of a cell’s endoplasmic reticulum. Little is known about the macroscopic effects of intracellular Ca²⁺ activity, so...
The structure and mechanics of tissues affect many important cellular functions such as migration, differentiation, and growth. Mechanical interactions between cells and the extracellular matrix (ECM), as well as ECM-mediated mechanical communication between cells, plays a part in coordinating collective cellular dy- namics during critical processes such as morphogenesis, tissue...
The potential for nanomedicine to reduce toxicity and improve therapeutic response to radiation is vast. Clinically, this potential has thus far only begun to be realized with the recent success of the radioenhancing nanoparticle, NBTXR3 by Nanobiotix. Radioenhancing nanoparticles, however, represent only a small class of nanomaterials that may be...
At the intersection of basic science research and clinical relevance, cancer metastasis and cell invasion is a multifaceted problem that has been investigated for the past several decades. Importantly, cancer cell plasticity, the ability of a single cell to change its phenotype without genetic mutations in response to environmental cues,...
The ability for individual cells and multicellular networks to process information contained in perceived stimuli is of vital importance to their proper functioning and ultimately their cellular fate. The primary mechanism employed by cells to this end is the use of biochemical signaling in which a series of molecular events...
Cell migration is fundamental for physiological processes such as immune re-sponses, wound healing and development. It is also a critical characteristic of metastatic cancer cells. An extensive amount of studies have focused on 2D sub-strates in order to understand the mechanism of cancer metastasis. However, much less is known about...
Current methods in traction force analysis rely on a homogeneous extra-cellular matrix and
embedded microbeads to track deformations. The efficacy of these methods decreases when the matrix is not homogeneous. In heterogeneous matrices, beads often aggregate in regions of higher matrix density and float in regions where matrix substrate is...
Triple-negative breast cancer (TNBC) is a particularly aggressive molecular subtype of malignant cells that tends to proliferate quickly and is commonly resistant to traditional chemotherapy leading to relapses in prognosis more frequently than other forms of breast cancer (BCa) [1][2][3]. Current treatment options include surgical resection of cancerous tissue and...
Type I collagen fibers, the connective tissue that makes up the human breast, can be easily manipulated by cells or other outside factors. In previous studies, the alignment of collagen has been associated with the beginning of metastatic cancer, possibly influencing cancerous cells to migrate from the tumor. In this...
Cell signaling under external stimulation is a critical mechanism that governs many biological processes such as cell proliferation, cell migration, and cell apoptosis, etc. For multicellular organisms, the ability to synchronize heterogeneous individual cellular responses through intercellular communication is crucial to maintain normal functionality. However, even though the biological pathways...
Invasive breast cancer affects 1 in 8 women during their lifetime. Current cancer research uses 2-D cell culturing, which does not accurately represent tumor behavior. In comparison to tumors, cells grown using 2-D cell culturing have different proliferation and diffusion rates, cell shapes, and gene expression. To improve in vitro...
This research specifically examines the collective motion of populations of MDA-MB-231 breast cancer cells under the influence of a chemo-attractant gradient. Their motion is compared to the mathematical model of a persistent random walk, measuring the persistence bias of the cells from their autocorrelation function and applying to the mean...
Exploring and quantifying the parameters regarding contact guidance may provide valuable insight to the precise mechanisms controlling cell movement, especially in a three-dimensional environment. The objective of this project was to quantify the relationship between MDA-MB-231 cell morphogenesis and the geometry of the cell’s local microenvironment, which was modeled by...
We developed an integration-based line detection algorithm. Existing line detection methods such as the Hough Transformation (HT) and its variants are insensitive to image noise. The reason is that HT finds lines by calculating the gradient of the image and assumes that the region where the gradient is the steepest...
Cancer cell migration in three-dimensional extracellular matrix is a major cause of death for cancer patients. Although extensive studies have elucidated detailed mechanism of single cell 3D invasion and cell-ECM interaction, 3D collective cancer invasion is still poorly understood. 3D collective migration models have unveiled unexpected degrees of diversity and...
The end of the Cold War brought about changes within international political relations that resulted in expanded interest in global civil society. Such developments, like globalization and democratization, have encouraged the growth of social and political organizations. Political scientists have found that these inter-governmental and non-governmental organizations have a significant...
Full Text:
Worldwide, the Artists Against Apartheid/Sun City project, and Jubilee 2000/Drop the Debt.
FIVE STANDARDS
The atmospheric radiative transfer model MOCARAT was developed and is presented in this thesis. MOCARAT employs a Monte Carlo Technique for the accurate modeling of band radiances and reflectances in an atmospheric system with a ruffled ocean surface as a lower boundary. The atmospheric radiative transfer is modeled with consideration...
The transition from high school (HS) to college can prove to be a
difficult one for many HS students. In becoming acclimated
within the academic and social realm of a college experience the
individual is offered an opportunity to develop many lifestyle
habits such as diet, sleep and most notably...
Hydrocarbon solvents are widely used in the production of paints, adhesives, dyes, polymers, plastics, textiles, printing inks, agricultural products and pharmaceuticals. While the neuropathic potential of aliphatic solvents was shown in the 1970s, little is known about the neuropathic potential of aromatic solvents. The present study examines such solvents, 1,2-diethylbenzene...
SAR11 Alphaproteobacteria are the most abundant aerobic chemoheterotrophs in ocean surface waters. Previous studies have indicated SAR11 cells play an important role in marine carbon cycling and consume up to half of some common dissolved organic compounds, such as amino acids. During sequencing of the first SAR11 genome, genes for...
The
purpose
of
this
study
was
to
characterize
the
neutral
lipids
of
the
fat
body
of
the
larva
of
the
fleshfly
Sarcophaga
bullata
and
to
examine
the
means
by
which
these
lipids
are
synthesized.
The
weight
of
the
larva,
the
fat
body
as
well
as
its
lipid
content
were
examined...
Childhood obesity prevalence is significantly higher among adolescent 12-19 years old than younger age groups. Youth athletes are overlooked by childhood obesity prevention programs. WAVE~Ripples for Change (WAVE) program is a 2-y obesity prevention intervention with high school (HS) soccer players (14-19y) using a mixed virtual- and physical-world learning environment...
This study aimed to evaluate the contingencies and reinforcements that most engage active high school (HS) students in a virtual classroom to learn and adopt healthy lifestyles. In Phase 1, 21 HS students completed focus groups about factors they perceived as engaging for them in learning about lifelong healthy habits....
Marketing of Mukene (Rastrineobola argentea) has become a lucrative business in Uganda after decades
of underutilization but its value-chain from capture to market remains unknown. Consequently, a study
was undertaken at two selected landing sites located along L. Victoria and several Kampala markets.
Using a structured questionnaire a total of...
The animal protein intake in Nigeria is grossly insufficient yet the retail price of fish is rising. Market intermediaries, alleged to charge excessive and unjustifiable marketing margins (MM), are often blamed for this. This study examines this allegation using data from 225 sun-dried fish traders classified into three groups. Data...
Proportion data falling in the continuum (0, 1) are very common in practice. It can also happen that an inflated number of zeros (or ones) occur with proportion data. There are extensive studies of zero-inflated data in the literature. Almost all of them, however, focus on zero-inflated count data. Furthermore,...
Marijuana (MJ) is a widely used illicit substance among adolescents and young adults. Frequent MJ use has been associated with impairments in cognitive flexibility and inhibition, both of which play important roles in decision-making. However, the impact of frequent MJ on decision-making performance is mixed and not well understood. The...
The mechanisms by which the activities of phospholipase C-β (PLC-β) enzymes are negatively regulated have not been well defined. We used cardiac-derived ratmyoblast H9c2 cells to investigate possible modes of regulation of PLC-β3 enzymes,the only endogenous β isoform abundantly found in these cells. The PLC-β3population in these cells was detected...
Rhizopogon vesiculosus is a common ectomycorrhizal (EM) symbiont of Pseudotusga menziesii (Douglas-fir) in the coast range of the Pacific Northwest. The species has been studied for its systematics, genet size, population structure, and competitive ability in several field and experimental studies. This thesis seeks to provide a more thorough characterization...
Elastic properties of plywood panels are essential for predicting
structural behavior of wood systems. The ASTM Standard D 3043-76
which evaluates the moduli of elasticity (MOE) of plywood, treats
these panels as one dimensional beams instead of two-dimensional
plates, which results in an overestimate of the MOE. Improved procedures
for...
Recently, switched-current circuits have received great
attention because they offer potentially better performance in terms
of speed, low voltage power supplies, and accuracy in mixed-mode
analog-digital signal processing. In this thesis, the distortion
characteristics, DC offset and AC gain errors induced by the threshold
voltage, channel width, channel length, and...
Advanced computer architectures are centered around the parallel computer systems. This project is focused on the experiment on two parallel computer architectures : Sequent Balance 21000 shared memory multiprocessor and Cogent XTM distributed system.
A set of benchmark programs are implemented using "C" language and Dynix parallel programming library on...
Enantioenriched sp³-hybridized carbenoid reagents CR1R2MX (X = nucleofuge, M = electrofuge) of different types were investigated for the synthesis of polysubstituted alkyl chains by iterative stereospecific reagent-controlled homologation (StReCH) and for the stereospecific connective synthesis of alkenes by eliminative cross-coupling.
In the first part, putative enantioenriched α-chloroalkyllithiums (CHRLiCl) were employed...
The objective of this study was to further determine the distribution of
selenoprotein W (SeW) in tissues from rats and sheep fed different selenium levels and to
search for the possible functions of this protein. In the rat study a total of 28 rat tissues
were examined and SeW was...
Several new solid-state inorganic borates have been prepared and
characterized. Single crystals of the simple orthoborate ScB0₃ were
grown and its structure was determined by single-crystal X-ray
methods. The new borates Li₃Sc(B0₃)₂, LaSc₃(B0₃)₄, NdSc₃(B0₃)₄,
SrNaB0₃, and Li4Ln4MB90₂₃ (Ln = Y, Er, and Gd; M = Al and Ga) were
identified...
This dissertation presents a phase domain in-loop-bandwidth spread-spectrum clock generation technique. In this proposed technique, a charge-based discrete-time loop filter is proposed to enable the phase domain in-loop-bandwidth spread-spectrum modulation without a delta-sigma modulator or time-to-digital converter. The in-loop-bandwidth modulation technique maximizes the loop bandwidth to improve phase noise suppression...
This thesis describes compensation techniques for cascaded delta-sigma A/D
converters (ADCs) and high-performance switched-capacitor (SC) circuits. Various
correlated-double-sampling (CDS) techniques are presented to reduce the effects of the
nonidealities, such as clock feedthrough, charge injection, opamp input-referred noise and
offset, and finite opamp gain, in SC circuits. A CDS technique...
Biorhythm theory proponents believe that humans have
a 23-day physical cycle, a 28-day emotional cycle, and a
33-day intellectual cycle. According to biorhythm theories
a person in the positive portion of any single cycle, the performance potential is enhanced for those tasks related to
that particular rhythm. When each cycle...
More than 30,000 potential Superfund sites have been identified. Heavy metals are contaminants at many of these Superfund sites. The average cost of cleanup a single-typical Superfund site currently stands at $20 million, and it is expected that the cost may escalate to $50 million within the next decade. Problems...
Current dietary recommendations have placed increasing emphasis on dietary fat
as an important element to decrease risk of cardiovascular disease (CVD). Although total
fat and the fatty acid composition of diets influence the risk of CVD, the optimal amounts
of different fatty acids are not well defined, especially if n-6...
Fire hazards threaten human life and property safety. Since it is unrealistic to study human behavior during a real fire hazard, computational tools are a better choice to computational tools are a better choice to simulate fire growth and human behavior for predicting evacuation performance in chaotic emergency situations. Although...
Seed germination is strictly defined as the physiological events before radicle
protrusion through the endosperm cap, the endosperm region adjacent to the radicle tip.
There are two opposing forces governing seed germination: the growth potential of the
embryo and the mechanical resistance of the endosperm cap. The endosperm cap cell...
The bacterium most frequently used in microbial
leaching processes and studies is Thiobacillus
ferrooxidans. Applications of this bacterium include the
treatment of coal, low-grade ores and industrial solid
wastes for the solubilization of pyrite and other trace
metals associated with sulfides. The goal of this study
was the development of...
The research developed a methodology to code and quantify eye movement patterns as a function of a neuro-linguistic programming strategy elicitation process. Secondarily the research established methodology that identified the degree of consistency among certain certified Neuro-Linguistic Programming Practitioners while they rated eye movements. The study reviewed literature in the...
The purpose of the present study was to investigate
consumer knowledge and attitudes toward consumer education
of college students in secondary teacher education
preparatory programs in Korea.
Specifically, this study was aimed to 1) measure the
degree of consumer knowledge of college students in
secondary teacher education preparatory programs, 2)...
Current math software provides limited interactivity and dynamics when conveying math
ideas. We are developing prototype Java toolkits to display math-embedded documents
in a more dynamic and interactive way. The core task of current project is to create a
Java implementation of a MathML (in which a math expression is...
This thesis presents an economic analysis for a proposed toll
road which is to separate different types of traffic such as pedestrians,
slow speed vehicles and high speed motor vehicles, and to
divert through traffic from the local roads. The use of a toll road
usually provides significant savings in...
Mg-MOF-74 is one type of metal-organic frameworks (MOFs) that is widely known for its excellent CO2 uptake capacity. More intriguingly, it can be used to detect low levels of toxic gas such as CO2. Currently, most research into Mg-MOF-74 focuses on using the powder type as a CO2 absorbent because...
Soil is a complex living system with high heterogeneity, which makes locating soil map boundaries a challenge. In traditional soil survey, the placement of soil map boundaries relies largely (at least initially) on identifying the soil-forming factors of biota and topographic relief through stereo aerial photo pairs. Future soil survey...
The aim of this work was to assess the viability of duplex stainless steel 2205 components built via selective laser melting for seawater applications. First, a comprehensive additive manufacturing assessment was done. The duplex stainless steel 2205 components were selectively laser melted from gas atomized powder (D90 <45m) using a...
Metal-organic frameworks (MOFs) have emerged as promising candidates in novel cancer therapies due to their unique properties, including high surface area, tunable crystal size, and exposed metal ion active sites for catalysis. The MOF NH2-MIL-88B has shown potential use in cancer theranostics. Its open metal active sites catalyze the reduction...
The bacteria Myxococcus xanthus clusters into fruiting bodies in the absence of food. The movement of M. xanthus has three aspects: self-propulsion (run), change of direction due to collision (tumble), and Brownian fluctuations in movement. We propose a minimalist PDE model for the concentrations of left and right moving agents...
Microtubules (MT) are highly dynamic cylindrical-like structures within cells whose growth is controlled by motor proteins, a class of biological machines that walk along the MT while simultaneously regulating MT growth. Here we are interested in the behavior of kinesin-14 motor proteins. Although processive behavior of kinesin-14 motors has been...
Thermodynamic properties of systems are often investigated computationally. Traditionally, thermal physics simulations are limited by their very small energy ranges and slow convergence. Broad histogram algorithms are a class of Monte Carlo algorithms that can explore an entire energy (and temperature) range in one thermal physics simulation: potentially saving months...
Observations of sunlight reflected from regions of sun glint are used to check the relative calibration of spectral radiances obtained with imaging radiometers. Reflectances at different wavelengths for sun-glint regions are linearly related. Provided that the atmosphere is reasonably transparent at the wavelengths, the aerosol burden is reasonably light, 0.64-μm...
Achromobacter A43 produced a compound inhibitory to the outgrowth
of Clostridium botulinum type E spores. The inhibitor could
be produced in various laboratory media and the outgrowth of germinated
spores was completely inhibited by 1/10th dilution of the A43
spent medium. Germination was not affected. The spores lost
refractility in...
The effect of vitamin B-6 (B-6) status on plasma fatty acids (FA) levels and lipid
metabolism was investigated in this metabolic study. Eight female subjects were fed for 28
days. For the first 7 days, they were fed a constant diet containing 2.10 mg of B-6. For the
rest of...
The worst case analysis of rounding error of eleven numerical
quadrature formulas on a computer with floating-point arithmetic,
base b, and t digit mantissa is calculated. These results are
applied to five different integrands using the digital computer CDC
3300 located at Oregon State University. Central processing unit
computing time,...
It is popular belief that the volatility of the exchange rate is due
to the balance of payments, which in turn is mainly influenced by the
balance of trade. A closed-loop dynamic economic model is proposed
to describe and analyse the effect of the international trade of a
country on...
Sea tide heights predicted one year
in advance are manipulated to give accelerations
in centimeters per second per kilometer for the
distances San Francisco to Humboldt Bay and
Humboldt Bay to Astoria. Comparison of these
accelerations to various earth-moon-sun lineups
shows the accelerations are controlled by the
29.53 day lunar...
Research Objective:
Determine if disparities in the allocation of lifesaving organs, specifically the kidney and liver, exist between low and non-low socioeconomic status (SES) groups in the US.
Study Design:
A literature review will be conducted to examine anticipated inequalities between patients of different SES. Potential causes of the disparity...
_____________________________________________________________________
Siew Sun Wong, Committee Member, representing School of Biological and Population Health
In this work, we systematically explore the effectiveness of optical aberration correction over a wide range of optical depths using the Segmented and Zernike Polynomial bases. We manufacture a set of 16 optical phantom samples consisting of a clear polyester resin substrate embedded with varying concentrations of aluminum oxide (Al₂O₃)...
Online survey data collection is becoming popular because it provides benefits in cost, ease of collecting and managing data, flexibility in format, and access to a diverse population. Surveys are often used for health studies such as Oregon State University’s WAVE Project, which utilizes the WavePipe system, a server enabling...
Foot pathology is a real problem in captive elephants. Osteoarthritis is the major concern among musculoskeletal disorders and foot health problems for elephants in North America zoos with one-‐half of Elephants in captivity showing foot health care problems in zoos. A higher ratio of captive Asian elephants (Elephas maximus) is...
Surveys are often used in health studies to collect data about participants for scientific research. An increasing number of health scientists are turning to online data collection methods because they are less costly and can reach a large diverse population quickly. Online surveys also make it easy to track and...
Physicists who study semiconductor devices are fascinated by the fundamental limits of device performance. From the sub-threshold swing of transistors to the power conversion efficiency of photocells, performance is limited by the electronic structure of the materials used to build them. To surpass traditional device limits, we must turn to...
In nanoscale materials, the Coulombic interaction between electrons are stronger than in bulk materials. These stronger interactions, caused by confinement and reduced dielectric screening, have interesting consequences for light-matter interactions. In carbon nanotubes (CNTs), strong interactions can enhance the impact ionization process, and thus assist photocurrent generation in CNTs. Conversely,...
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8 Appendix: Extended data for devices A-J
Taking long-term electrical measurements of a large number of neurons simultaneously is required for many modern neuroscience experiments. However, such experiments are currently limited by the shortcomings of traditional neurosensing technology. For example, there is a significant mechanical mismatch between rigid silicon probes and soft biological tissues. This mismatch can...
Long-period global-scale electromagnetic induction studies of deep Earth conductivity are based almost exclusively on magnetovariational methods and require accurate models of external source spatial structure. We describe approaches to inverting for both the external sources and three-dimensional (3-D) conductivity variations and apply these methods to long-period (T≥1.2 days) geomagnetic observatory...
As the number of students and faculty involved in online learning in recent decades has increased, we recognize that there is a limited understanding of how learners react, interact, behave, and are served by the various components in the information delivery processes. When learning online without an instructor present in...
The value of the effective exchange coefficient for area-averaged fluxes can depend significantly on the averaging scale. This dependence implies that the exchange coefficient in numerical models should depend on grid size. The main goal of this study is the assessment of the importance of such scale-dependence. When the large-scale...
In the last 30 years the Chinese Aquaculture Sector has become one of the most rapidly developing areas within Chinese Agriculture. The total output of aquaculture products (more than 51 million tons) has placed China as the world’s largest producer of aquaculture products since 1990, with more than 70% of...
Japan has been the biggest export market of aquatic products of China for many years. The export of aquatic products to Japan reached more than 700,000 ton and $ 3 billion in 2007. The influence to the export market caused by the sweeping economic crisis will affect the benefits of...
Surface-associated thrombosis is a critical concern in medical device development. Current extracorporeal circulation units require systemic anticoagulation to avoid thrombosis, which can cause adverse effects such as thrombocytopenia, hypertriglyceridemia, and hyperkalemia. To address this issue, we combine the technology of polydopamine (PDA) functionalization with slippery liquid infused porous surfaces (SLIPS)....
Multicellular coordination in response to environmental stimuli is essential in biology, and this coordination is often achieved by a division of labor to establish leaders and followers in a cell population. This is called emergent leadership, but how a cell adopts its role and effectively exchanges information with peers is...
Background: The use of high-Z nanoparticles as radiation dose enhancers has been researched thoroughly over the past decade. High-Z nanoparticles introduced to a medium increase the probability of photoelectric absorption. This leads to an increase in the production of short range characteristic and Auger electrons and, thus, local radiation dose....
Radiochromic film dosimetry offers many advantages over standard film that requires wet chemical processing. Radiochromic film offers: a permanent color change upon irradiation; high spatial resolution; a response that is independent of energy, particle type, and angle of incidence; near tissue equivalence; and a wide dosimetric range. However, there are...
Uploading everyday information about food intake, sleep, number of steps and then generating consolidated peer visual reports for participants in large-scale health studies, often divided into multiple treatment groups, can be challenging.
This challenge is even bigger if subjects are young teenagers between the age of 14-19 active in sports,...
The Brain Research through Advanced Innovative Neurotechnologies (BRAIN) initiative seeks to understand how ensembles of neurons create neural networks. The initiative has spurred the pursuit of developing novel experimental tools for investigating how individual neurons propagate electrical signals (action potentials) to produce ensemble behavior. Classical techniques to measure the internal...