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Articles 1081 - 1110 of 1344
Full-Text Articles in Laboratory and Basic Science Research
Volunteer Studies In Pain Research — Opportunities And Challenges To Replace Animal Experiments: The Report And Recommendations Of A Focus On Alternatives Workshop, C. K. Langley, Q. Aziz, C. Bountra, N. Gordon, P. Hawkins, A. Jones, G. Langley, T. Nurmikko, I. Tracey
Volunteer Studies In Pain Research — Opportunities And Challenges To Replace Animal Experiments: The Report And Recommendations Of A Focus On Alternatives Workshop, C. K. Langley, Q. Aziz, C. Bountra, N. Gordon, P. Hawkins, A. Jones, G. Langley, T. Nurmikko, I. Tracey
Experimentation Collection
Despite considerable research, effective and safe treatments for human pain disorders remain elusive. Understanding the biology of different human pain conditions and researching effective treatments continue to be dominated by animal models, some of which are of limited value. British and European legislation demands that non-animal approaches should be considered before embarking on research using experimental animals. Recent scientific and technical developments, particularly in human neuroimaging, offer the potential to replace some animal procedures in the study of human pain. A group of pain research experts from academia and industry met with the aim of exploring creatively the tools, strategies …
Estimates For Worldwide Laboratory Animal Use In 2005, Katy Taylor, Nicky Gordon, Gill Langley, Wendy Higgins
Estimates For Worldwide Laboratory Animal Use In 2005, Katy Taylor, Nicky Gordon, Gill Langley, Wendy Higgins
Laboratory Experiments Collection
Animal experimentation continues to generate public and political concern worldwide. Relatively few countries collate and publish animal use statistics, yet this is a first and essential step toward public accountability and an informed debate, as well as being important for effective policy-making and regulation. The implementation of the Three Rs (replacement, reduction and refinement of animal experiments) should be expected to result in a decline in animal use, but without regular, accurate statistics, this cannot be monitored. Recent estimates of worldwide annual laboratory animal use are imprecise and unsubstantiated, ranging from 28–100 million. We collated data for 37 countries that …
Comparison Of Microleakage In Three Sealant Placement Protocols Vs. The Enamel Loc System, Audrey T. Sheu
Comparison Of Microleakage In Three Sealant Placement Protocols Vs. The Enamel Loc System, Audrey T. Sheu
Loma Linda University Electronic Theses, Dissertations & Projects
PURPOSE: To evaluate sealant microleakage using four different application techniques.
METHODS: The four application techniques evaluated were acid etch only, Adper L-Pop bonding, Optibond bonding, and Enamel Loc One-Step Sealant. Sixty-four extracted third molar teeth were assigned on one of four application techniques (n=16) and Clinpro sealants applied according to the manufacturer's instructions. The teeth were thermocycled for 500 cycles, dyed, and embedded in resin. The samples were then sectioned and evaluated for microleakage on the buccal and lingual surfaces. Statistical methods employed to analyze the data were the Kruskal-Willis rank test and the Mann-Whitney U test.
RESULTS: No significant …
Response Of Endothelial Cells To Stressors: The Impact Of Aging And Diabetes, Katie Mclellan
Response Of Endothelial Cells To Stressors: The Impact Of Aging And Diabetes, Katie Mclellan
Loma Linda University Electronic Theses, Dissertations & Projects
Preliminary research indicates there is some impairment of the endothelial cells to respond to single stressors such as local heat, shear stress, and global heat in older people and people who have diabetes. The response of the skin blood flow to local heat is an indicator of the endothelial cells ability to cope with stress. In addition, factors such as thicker subcutaneous fat and skin moisture may impair the skin’s ability to dissipate heat. For older people and people with diabetes, this endothelial dysfunction may cause an even more diminished response to multiple stressors. However, no studies have examined the …
Statistical Methods For Automated Drug Susceptibility Testing: Bayesian Minimum Inhibitory Concentration Prediction From Growth Curves, Xi Zhou, Merlise A. Clyde, James Garrett, Viridiana Lourdes, Michael O'Connell, Giovanni Parmigiani, David J. Turner, Tim Wiles
Statistical Methods For Automated Drug Susceptibility Testing: Bayesian Minimum Inhibitory Concentration Prediction From Growth Curves, Xi Zhou, Merlise A. Clyde, James Garrett, Viridiana Lourdes, Michael O'Connell, Giovanni Parmigiani, David J. Turner, Tim Wiles
Johns Hopkins University, Dept. of Biostatistics Working Papers
Determination of the minimum inhibitory concentration (MIC) of a drug that prevents microbial growth is an important step for managing patients with infections. In this paper, we present a novel probabilistic approach that accurately estimates MICs based on a panel of multiple curves reflecting features of bacterial growth. We develop a probabilistic model for determining whether a given dilution of an antimicrobial agent is the MIC given features of the growth curves over time. Because of the potentially large collection of features, we utilize Bayesian model selection to narrow the collection of predictors to the most important variables. In addition …
Non-Animal Methodologies Within Biomedical Research And Toxicity Testing, Andrew Knight
Non-Animal Methodologies Within Biomedical Research And Toxicity Testing, Andrew Knight
Experimentation Collection
Laboratory animal models are limited by scientific constraints on human applicability, and increasing regulatory restrictions, driven by social concerns. Reliance on laboratory animals also incurs marked – and in some cases, prohibitive – logistical challenges, within high-throughput chemical testing programmes, such as those currently underway within Europe and the US. However, a range of non-animal methodologies is available within biomedical research and toxicity testing. These include: mechanisms to enhance the sharing and assessment of existing data prior to conducting further studies, and physicochemical evaluation and computerised modelling, including the use of structure-activity relationships and expert systems. Minimally-sentient animals from lower …
Behavioral Effects Of Contraception Management: The Use Of Porcine Zona Pellucida On Wild Horses, Cassandra M.V. Nuñez
Behavioral Effects Of Contraception Management: The Use Of Porcine Zona Pellucida On Wild Horses, Cassandra M.V. Nuñez
Cassandra M.V. Nuñez
The advent of immunocontraception with porcine zona pellucida (PZP) has all but revolutionized wild horse management, providing a more humane method of population control than earlier strategies. Early studies on Assateague Island National Seashore have described it as an ideal form of fertility control in that it reduces the chance of conception to below 10%, can be delivered remotely, is reversible (after short-term use), lacks debilitating physiological side effects, cannot pass through the food chain, and shows minimal effects on social behaviors. However, recent research in other populations has revealed behavioral and physiological side effects of long-term PZP use. These …
Urine Protein Electrophoresis: Comparison Of Agarose Gel And Capillary Zone Electrophoretic Techniques., Anne-Marie Curtin
Urine Protein Electrophoresis: Comparison Of Agarose Gel And Capillary Zone Electrophoretic Techniques., Anne-Marie Curtin
Theses
Proteinuria is the excess excretion of protein in the urine and is found in a variety of conditions including renal diseases and neoplastic conditions such as multiple myeloma (MM). The investigation of proteinuria type through the use of electrophoresis is a useful and widely used non-invasive diagnostic tool. The aim of this study was to compare various agarose gel and capillary zone electrophoresis techniques in order to establish a method choice for the separation of protein in routine laboratories. Comparisons were made based on urine monoclonal peak quantification and protein fractions detected. An examination of a capillary zone electrophoresis (CZE) …
Micropropagation Of Guava (Psidium Guajava L.), Rajesh Pati
Micropropagation Of Guava (Psidium Guajava L.), Rajesh Pati
Rajesh Pati
A foolproof method of micropropagation through in vitro shoot bud culture has been developed in guava cv. ‘Allahabad Safeda’. The stock plant of guava was maintained at shade net house (75% shade) and pruned severely to encourage new growth. Around 3 cm long shoots were excised and defoliated. The explants were pretreated in solution containing 0.1% Carbendazime and 100 mg/L PVP for 1 hour and then washed with Tween-20 wetting agent. The pretreated explants were further treated with HgCl2 0.1% for 5 minutes aseptically followed by six washing in autoclaved distilled water. The sterilized explants were cultured on MS medium …
The Development Of New Concepts For Assessing Reproductive Toxicity Applicable To Large Scale Toxicological Programmes, S. Bremer, C. Pellizzer, S. Hoffmann, T. Seidle, T. Hartung
The Development Of New Concepts For Assessing Reproductive Toxicity Applicable To Large Scale Toxicological Programmes, S. Bremer, C. Pellizzer, S. Hoffmann, T. Seidle, T. Hartung
Experimentation Collection
Large scale toxicological testing programmes which are currently ongoing such as the new European chemical legislation REACH require the development of new integrated testing strategies rather than applying traditional testing schemes to thousands of chemicals. The current practice of requiring in vivo testing for every possible adverse effect endanger the success of these programmes due (i) to limited testing facilities and sufficient capacity of scientific/technical knowledge for reproductive toxicity; (ii) an unacceptable number of laboratory animals involved (iii) an intolerable number of chemicals classified as false positive.
A key aspect of the implementation of new testing strategies is the determination …
Practice Notes: Strategies In Health Education Program, “Full Service”: Talking About Fighting Prostate Cancer—In The Barber Shop!, Lisa D. Lieberman, Mario C. Browne, Barbara Hager
Practice Notes: Strategies In Health Education Program, “Full Service”: Talking About Fighting Prostate Cancer—In The Barber Shop!, Lisa D. Lieberman, Mario C. Browne, Barbara Hager
Department of Public Health Scholarship and Creative Works
The purpose of this project is to promote prostate cancer screening, education about disease risk and the importance of early detection, and survivorship among African American males who frequent African American–owned barber shops.
The Effect Of Mtad On Eight Strains Of E. Faecalis In Contaminated Root Canals, Bradley M. Newberry
The Effect Of Mtad On Eight Strains Of E. Faecalis In Contaminated Root Canals, Bradley M. Newberry
Loma Linda University Electronic Theses, Dissertations & Projects
The purpose of this investigation was to determine the antimicrobial effect of Biopure MTAD (a mixture of a tetracycline isomer, an acid, and a detergent) as a final irrigant on eight strains of Enterococcus faecalis (E. faecalis) in contaminated root canals of extracted human teeth. In addition, the Minimum Inhibitory Concentration (MIC) and Minimum Lethal Concentration (MLC) of MTAD were also measured on the same strains of bacteria. Two-hundred and forty extracted human teeth were instrumented using 1.3% NaOCl followed by 17% EDTA to remove the smear layer. The teeth were randomly contaminated with one of eight strains of E. …
Forensics: Crime Scene Investigation Case Closed, Christina Parente
Forensics: Crime Scene Investigation Case Closed, Christina Parente
Senior Honors Projects
No abstract provided.
Biochemical Characteristics Of Inconsistent Free T₄ Assays, Kristofer S. Fritz
Biochemical Characteristics Of Inconsistent Free T₄ Assays, Kristofer S. Fritz
Loma Linda University Electronic Theses, Dissertations & Projects
Serum levels of free thyroxine (T4) are helpful in the clinical evaluation of patients who are suspected of having thyroid disease, since free T4 (unbound) is known to closely relate to hyper, eu and hypothyroidism. There are documented inconsistencies among commercially available direct free thyroxine immunoassays. The biochemical basis for these inconsistencies is not understood and has not been characterized. Direct free T4 measurements have been linked to both T4-binding serum protein concentrations and protein-bound T4 concentrations. A free T4 reference method using direct equilibrium dialysis radioimmunoassay has been well characterized. New …
The Effect Of Radiation And Repeated Sub-Culturing On Tgf-Β1 Signaling In Frtl-5 Cells, Cheryl G. Burrell
The Effect Of Radiation And Repeated Sub-Culturing On Tgf-Β1 Signaling In Frtl-5 Cells, Cheryl G. Burrell
Loma Linda University Electronic Theses, Dissertations & Projects
From our ongoing in vitro studies using the Fisher Rat Thyroid cell line-5 (FRTL-5) we recorded accelerated growth, reduced follicularization and reduction in thyroxin release that occurred as the cells were repeatedly sub-cultured. We also recorded that these changes occurred earlier and more rapidly following radiation exposure. We determined that TGF-β1 production increased under both conditions. We hypothesized that alteration in the TGF-β1 signaling pathway contributed to the changes observed in the cellular properties of FRTL-5 cells. Our objective was to examine some of the players in the TGF-β1 signaling pathway to determine whether radiation and/or repeated subculturing promoted changes …
Radiation-Induced Increases In Pkc Modulate Integrin Expression And Contribute To Fibrotic Changes, Pinal Rushikesh Pandya
Radiation-Induced Increases In Pkc Modulate Integrin Expression And Contribute To Fibrotic Changes, Pinal Rushikesh Pandya
Loma Linda University Electronic Theses, Dissertations & Projects
The sequences of events in fibrosis are similar to those in wound healing; however, the normal termination and resolution stages do not take place. The initial cellular response following ionizing radiation involves accumulation of the ECM (extracellular matrix) including collagen, fibronectin and the interaction of many growth factors (cytokines) with their receptors. There are a number of unanswered questions regarding many aspects of radiation-induced fibrosis, including the initial triggers and physical changes that initiate the process. We have confirmed that elevated pKC and other cellular changes following radiation are similar to those found at sites of inflammation. This information leads …
Research Experience Outside The Lab, Loreen Fournier
Research Experience Outside The Lab, Loreen Fournier
Inquiry Journal 2007
No abstract provided.
The Time Invariance Principle, Ecological (Non)Chaos, And A Fundamental Pitfall Of Discrete Modeling, Bo Deng
The Time Invariance Principle, Ecological (Non)Chaos, And A Fundamental Pitfall Of Discrete Modeling, Bo Deng
Department of Mathematics: Faculty Publications
This paper is to show that most discrete models used for population dynamics in ecology are inherently pathological that their predications cannot be independently verified by experiments because they violate a fundamental principle of physics. The result is used to tackle an on-going controversy regarding ecological chaos. Another implication of the result is that all continuous dynamical systems must be modeled by differential equations. As a result it suggests that researches based on discrete modeling must be closely scrutinized and the teaching of calculus and differential equations must be emphasized for students of biology.
From Observers To Participants: Joining The Scientific Community, Catherine A. Reinke, Susan R. Singer, Carl Mcdaniel, Carolyn J. Ferguson, Julia Vandermeer, Adam Williamson
From Observers To Participants: Joining The Scientific Community, Catherine A. Reinke, Susan R. Singer, Carl Mcdaniel, Carolyn J. Ferguson, Julia Vandermeer, Adam Williamson
Faculty Publications
In this essay, we have integrated the voices of our mentors and students to explore 45 years of undergraduate research experiences and their role in shaping our scientific community. In considering our collective experiences, we see undergraduate involvement in research as a rich source of community development, one that has both touched our lives and influenced our teaching.
Inhibition Of Astroglial Kir4.1 Channels By Selective Serotonin Reuptake Inhibitors, Y. Ohno, H. Hibino, Christoph Lossin, A. Inanobe, Y. Kurachi
Inhibition Of Astroglial Kir4.1 Channels By Selective Serotonin Reuptake Inhibitors, Y. Ohno, H. Hibino, Christoph Lossin, A. Inanobe, Y. Kurachi
Christoph Lossin, Ph.D.
The inwardly rectifying K+ (Kir) channel Kir4.1 is responsible for astroglial K+ buffering. We recently found that tricyclic antidepressants (TCAs) inhibit Kir4.1 channel currents, which suggests that astroglial Kir currents might be involved in the pharmacological action of antidepressants. We therefore further examined the effects of the currently most popular antidepressants, selective serotonin reuptake inhibitors (SSRIs), and other related agents on Kir4.1 channels heterologously expressed in HEK293T cells. The whole-cell patch clamp technique was used. Fluoxetine, the typical SSRI, inhibited Kir4.1 channel currents in a concentration-dependent manner with an IC50 value of 15.2 microM. The inhibitory effect of fluoxetine was …
Inhibition Of Astroglial Inwardly Rectifying Kir4.1 Channels By A Tricyclic Antidepressant, Nortriptyline., S. Su, Y. Ohno, Christoph Lossin, A. Inanobe, Y. Kurachi
Inhibition Of Astroglial Inwardly Rectifying Kir4.1 Channels By A Tricyclic Antidepressant, Nortriptyline., S. Su, Y. Ohno, Christoph Lossin, A. Inanobe, Y. Kurachi
Christoph Lossin, Ph.D.
The inwardly rectifying K(+) (Kir) channel Kir4.1 is responsible for astroglial K(+) buffering. We examined the effects of nortriptyline, a tricyclic antidepressant (TCA), on Kir4.1 channel currents heterologously expressed in HEK293T cells, using a whole-cell patch-clamp technique. Nortriptyline (3-300 microM) reversibly inhibited Kir4.1 currents in a concentration-dependent manner, whereas it marginally affected neuronal Kir2.1 currents. The inhibition of Kir4.1 channels by nortriptyline depended on the voltage difference from the K(+) equilibrium potential (E(K)), with greater potency at more positive potentials. Blocking kinetics of the drug could be described by first-order kinetics, where dissociation of the drug slowed down and association …
Glow Sticks As Effective Bait For Capturing Aquatic Amphibians In Funnel Traps, Kristine L. Grayson, Andrew W. Roe
Glow Sticks As Effective Bait For Capturing Aquatic Amphibians In Funnel Traps, Kristine L. Grayson, Andrew W. Roe
Biology Faculty Publications
Funnel traps of various designs have been used to capture adults and larvae of aquatic amphibians (e.g., Buech and Egeland 2002; Richter 1995). Most studies use unbaited funnel traps to capture amphibians while others have used shrimp or salmon eggs (Adams et al. 1997). Light traps and light sticks are commonly used in studies of fish, particularly larvae (Doherty 1987; Marchetti et al. 2004), but have not been widely used to capture amphibians. Glow sticks have been mentioned briefly in the literature as a means to increase capture rates of aquatic amphibians (Smith and Rettig 1996), but no studies have …
The Effect Of Walnuts Compared To Fatty Fish On Plasma And Erythrocyte Fatty Acid Composition, Lymphocyte Subsets And Inflammatory Mediators, Yu-Lan Ching
Loma Linda University Electronic Theses, Dissertations & Projects
The purpose of this study was to compare the effects of walnuts vs. fatty fish on circulating inflammatory markers, on lymphocyte subsets, on plasma concentrations of eicosanoids precursor polyunsaturated fatty acid and on erythrocyte membrane fatty acid composition. Under controlled metabolic feeding conditions and randomized crossover (3x3 Latin-square) design, 27 subjects alternately consumed a control diet, a walnut diet (1.5 oz (42.5g) /day of walnuts, 6 times/week) or a fish diet (8 oz (226g) /week of salmon) for 4 weeks each. Consumption of the walnut diet (ALA 5.43 g/day) compared to the fish diet (EPA 170 mg/day and DHA 590 …
Aged Rats: Sex Differences And Responses To Chronic Stress, Rachel E. Bowman, Neil J. Maclusky, Samantha Diaz-Weinstein, Mark C. Zrull, Victoria N. Luine
Aged Rats: Sex Differences And Responses To Chronic Stress, Rachel E. Bowman, Neil J. Maclusky, Samantha Diaz-Weinstein, Mark C. Zrull, Victoria N. Luine
Psychology Faculty Publications
Cognitive, as well as physiological, sex differences exist in young adult rats under both basal conditions and following chronic stress; however, few studies have examined whether sex differences remain in aged subjects and whether responses to stress are altered. We compared aged male and female Fischer 344 rats (21.5 months at testing) without stress and when given 21 days of restraint for 6 h/day on locomotion, anxiety-related behaviors, object recognition (non-spatial memory), object placement (spatial memory), body weight and serum steroid hormone levels. Control (unstressed) females had lower levels of estradiol and testosterone and higher corticosterone than males, and stress …
An In Vitro Model Of Ovarian Cancer: Studying The Effects Of Talc And Pycnogenol®, Amber Renée Buz'zard
An In Vitro Model Of Ovarian Cancer: Studying The Effects Of Talc And Pycnogenol®, Amber Renée Buz'zard
Loma Linda University Electronic Theses, Dissertations & Projects
Ovarian cancer is the sixth most common cancer and accounts for more deaths than any other cancer of the female reproductive system. The American Cancer Society has suggested that poor diet, talc and industrial pollutants may increase the risk of developing ovarian cancer. Talc is ubiquitous and concern is raised about its safety, role as a possible carcinogen and known ability to cause irritation and inflammation. Due to the silent nature of ovarian cancer, chemoprevention is a high priority. The most useful chemopreventive compounds will inhibit, delay or reverse carcinogenesis, and can be taken for long periods of time with …
Semiparametric Regression Of Multi-Dimensional Genetic Pathway Data: Least Squares Kernel Machines And Linear Mixed Models, Dawei Liu, Xihong Lin, Debashis Ghosh
Semiparametric Regression Of Multi-Dimensional Genetic Pathway Data: Least Squares Kernel Machines And Linear Mixed Models, Dawei Liu, Xihong Lin, Debashis Ghosh
Harvard University Biostatistics Working Paper Series
No abstract provided.
). Clonal Micropropagation Of Indian Gooseberry (Emblica Officinalis Gaertn)., Rajesh Pati
). Clonal Micropropagation Of Indian Gooseberry (Emblica Officinalis Gaertn)., Rajesh Pati
Rajesh Pati
No abstract provided.
The Acute Effects Of Nut Ingestion On Plasma Levels Of Polyphenol Compounds, Biomarkers Of Antioxidant Status, And Lipid Peroxidation, Setareh Torabian Esfahani
The Acute Effects Of Nut Ingestion On Plasma Levels Of Polyphenol Compounds, Biomarkers Of Antioxidant Status, And Lipid Peroxidation, Setareh Torabian Esfahani
Loma Linda University Electronic Theses, Dissertations & Projects
Nuts are rich sources of polyphenolic compounds and nutrients, which have antioxidant capacity. To assess the acute effect of treatment diet (75% of energy from nuts (walnut or almond) and control diet (habitual diet with no nut consumption) in healthy subjects on plasma total phenol content, antioxidant capacity and plasma lipid peroxidation. Thirteen subjects participated in the crossover design study. After an overnight fast, walnut, almond and a control diet, in form of smoothies, were consumed by the study subjects. Each subject participated on three occasions one week apart, consuming one of the smoothies each time. Blood samples were obtained …
Supervised Detection Of Conserved Motifs In Dna Sequences With Cosmo, Oliver Bembom, Sunduz Keles, Mark J. Van Der Laan
Supervised Detection Of Conserved Motifs In Dna Sequences With Cosmo, Oliver Bembom, Sunduz Keles, Mark J. Van Der Laan
U.C. Berkeley Division of Biostatistics Working Paper Series
A number of computational methods have been proposed for identifying transcription factor binding sites from a set of unaligned sequences that are thought to share the motif in question. We here introduce an algorithm, called cosmo, that allows this search to be supervised by specifying a set of constraints that the position weight matrix of the unknown motif must satisfy. Such constraints may be formulated, for example, on the basis of prior knowledge about the structure of the transcription factor in question. The algorithm is based on the same two-component multinomial mixture model used by MEME, with stronger reliance, however, …
Effects Of Diabetes Mellitus On The Healing Of The Dental Pulp, Stuart Evan Garber
Effects Of Diabetes Mellitus On The Healing Of The Dental Pulp, Stuart Evan Garber
Loma Linda University Electronic Theses, Dissertations & Projects
Diabetes Mellitus (DM) has been implicated as a factor affecting healing. The purpose of this study was to use the healing of experimentally exposed pulps subsequent to pulp capping as a model to determine the effect of DM on healing.
Twenty-two Sprague-Dawley rats were divided into two groups of eleven animals each. In one group, DM was induced by injection of 70 mg/KG of streptozotocin. In the other group, the animals were injected with sterile saline. Under anesthesia with Ketamine and Xylazine, the pulps of the maxillary first molars of all rats were exposed using a 1/16 round bur under …