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Articles 1 - 16 of 16
Full-Text Articles in Life Sciences
Initial State Of The Drosophila Eye Before Dorsoventral Specification Is Equivalent To Ventral, Amit Singh, Kwang-Wook Choi
Initial State Of The Drosophila Eye Before Dorsoventral Specification Is Equivalent To Ventral, Amit Singh, Kwang-Wook Choi
Biology Faculty Publications
Dorsoventral (DV) patterning is crucial for eye development in invertebrates and higher animals. DV lineage restriction is the primary event in undifferentiated early eye primordia of Drosophila. InDrosophila eye disc, a dorsal-specific GATA family transcription factor pannier (pnr) controls Iroquois-Complex (Iro-C) genes to establish the dorsal eye fate whereas Lobe (L), which is involved in controlling a Notch ligand Serrate (Ser), is specifically required for ventral growth. However, fate of eye disc cells before the onset of dorsal expression of pnr and Iro-C is not known. We show that L/Ser …
Are Biotech Crops And Conventional Crops Like Products? An Analysis Under Gatt, Julian Wong
Are Biotech Crops And Conventional Crops Like Products? An Analysis Under Gatt, Julian Wong
Duke Law & Technology Review
The transatlantic debate over the use of genetically modified organisms ("GMO"s) as food products, with the US as a proponent on one side, and the European Union ("EU") as an opponent on the other, is set to take center stage. The US has initiated formal legal action under the World Trade Organization Dispute Settlement System, charging that the EU violates several agreements of international trade law, including Article III of GATT, an anti-protectionist measure which forbids a country from favoring its own products over imported "like products." The US claims that GMOs and conventional crops are "like products,, and that …
Hatch–Waxman Reform And Accelerated Market Entry Of Generic Drugs: Is Faster Necessarily Better?, Sarah E. Eurek
Hatch–Waxman Reform And Accelerated Market Entry Of Generic Drugs: Is Faster Necessarily Better?, Sarah E. Eurek
Duke Law & Technology Review
Recently there has been a considerable amount of pressure to accelerate consumer access to generic drugs, which are significantly less expensive than their brand-name counterparts. One way to bring generic drugs on to the market sooner is through revision of the existing law relating to pharmaceutical patents. This iBrief describes recent regulatory changes to the Drug Price Competition and Patent Term Restoration Act (the Hatch-Waxman Act), which governs the patenting process for new drug products, as well as current legislative efforts to speed generic access through Hatch-Waxman reform. This iBrief also assesses whether these changes will be beneficial to consumers …
Reviving Informed Consent: Using Risk Perception In Clinical Trials, Dana Ziker
Reviving Informed Consent: Using Risk Perception In Clinical Trials, Dana Ziker
Duke Law & Technology Review
The current doctrine of informed consent falls far short of its potential to serve as a valuable safeguard for human research subjects. Instead of providing a channel of communication between physician and subject, informed consent is a lifeless entity responsible for a large portion of the misunderstanding existing between these parties. Acknowledging risk perception principles may help transform the informed consent process into an effective communication of health risks.
Life Cycle Of A Torrenticolous Hawaiian Chironomid (Telmatogeton Torrenticola): Stream Flow And Microhabitat Effects, M. Eric Benbow, Albert J. Burky, Carl M. Way
Life Cycle Of A Torrenticolous Hawaiian Chironomid (Telmatogeton Torrenticola): Stream Flow And Microhabitat Effects, M. Eric Benbow, Albert J. Burky, Carl M. Way
Biology Faculty Publications
In this study we documented the instar densities and life cycle of Telmatogeton torrenticola Terry (Chironomidae : Telmatogetoninae) from Kinihapai Stream, Maui, Hawaii. Greatest larval densities of this midge are found on substrates of high velocity, shallow flows of cascades, and splash zones of waterfalls, with lower densities in riffles. In the summer of 1994 we compared the effects of two microhabitats (termed optimal and suboptimal) on inter-instar density and relative abundance. In a second year (1995), we evaluated the effect of long-term reduced stream flow on these variables only in optimal microhabitats. A significant reduction in stream flow from …
Real-Time Study Of Multidrug Resistance Mechanism In Pseudomonas Aeruginosa Using Nanoparticle Optics And Single Live Cell Imaging, Sophia Vasou Kyriacou
Real-Time Study Of Multidrug Resistance Mechanism In Pseudomonas Aeruginosa Using Nanoparticle Optics And Single Live Cell Imaging, Sophia Vasou Kyriacou
Chemistry & Biochemistry Theses & Dissertations
This thesis centers on the study of the xenobiotic efflux system in Pseudomonas aeruginosa, which is a ubiquitous bacterium. It resists many structurally and functionally diverse substrates due to expression of Mex-extrusion pumps, including MexAB-OprM, MexCD-OprJ, MexEF-OprN and MexXY-OprM systems. Despite extensive research, the structure and mechanism of multidrug resistance is unclear (1-9). For example, (i) how do MexA, MexB and OprM proteins assemble to extrude antibiotics? (ii) What is the antibiotic susceptibility of MexA, MexB, and OprM proteins? (iii) How do substrates cross the outer membrane of P. aeruginosa? (iv) Where are antibiotics accumulated inside the cell? This thesis …
The Effects Of Intense Submicrosecond Electrical Pulses On Cells, Jingdong Deng, Karl H. Schoenbach, E. Stephen Buescher, Pamela S. Hair, Paula M. Fox, Stephen J. Beebe
The Effects Of Intense Submicrosecond Electrical Pulses On Cells, Jingdong Deng, Karl H. Schoenbach, E. Stephen Buescher, Pamela S. Hair, Paula M. Fox, Stephen J. Beebe
Bioelectrics Publications
A simple electrical model for living cells predicts an increasing probability for electric field interactions with intracellular substructures of both prokaryotic and eukaryotic cells when the electric pulse duration is reduced into the submicrosecond range. The validity of this hypothesis was verified experimentally by applying electrical pulses (durations 100 μs– 60 ns, electric field intensities 3–150 kV/cm) to Jurkat cells suspended in physiologic buffer containing propidium iodide. Effects on Jurkat cells were assessed by means of temporally resolved fluorescence and light microscopy. For the longest applied pulses, immediate uptake of propidium iodide occurred consistent with electroporation as the cause of …
Comparison Of Methods For Dna Isolation From Food Samples For Detection Of Shiga Toxin-Producing Escherichia Coli By Real-Time Pcr, Loree C. Heller, Carisa R. Davis, K. Kealy Peak, David Wingfield, Andrew C. Cannons, Philip T. Amuso, Jacqueline Cattani
Comparison Of Methods For Dna Isolation From Food Samples For Detection Of Shiga Toxin-Producing Escherichia Coli By Real-Time Pcr, Loree C. Heller, Carisa R. Davis, K. Kealy Peak, David Wingfield, Andrew C. Cannons, Philip T. Amuso, Jacqueline Cattani
Bioelectrics Publications
In this study, food samples were intentionally contaminated with Escherichia coli O157:H7, and then DNA was isolated by using four commercial kits. The isolated DNA samples were compared by using real-time PCR detection of the Shiga toxin genes. The four kits tested worked similarly.
The Case For National Dna Identification Cards, Ben Quarmby
The Case For National Dna Identification Cards, Ben Quarmby
Duke Law & Technology Review
Foes of the United States have demonstrated their ability to strike at the heart of this country. Fear of renewed attacks and a desire for greater national security have now prompted many to call for improvements in the national personal identification system. In particular, the possibility of a national identification card containing the carrier's DNA information is being seriously considered. However, this raises difficult questions. Would such a card system, and the extraction of individuals' DNA it entails, violate the 4th Amendment of the Constitution? This article will show that such a card system could in fact be found to …
Trends. Security, Stigma, And Biological Weapons, Ibpp Editor
Trends. Security, Stigma, And Biological Weapons, Ibpp Editor
International Bulletin of Political Psychology
This Trends article discusses the political psychology of security concerns pertaining to unclassified information relating to biological weapons and/or biosecurity and how it might be used to harm US security.
Transmembrane Movement Of Exogenous Long-Chain Fatty Acids: Proteins, Enzymes, And Vectorial Esterification, Paul N. Black, Concetta C. Dirusso
Transmembrane Movement Of Exogenous Long-Chain Fatty Acids: Proteins, Enzymes, And Vectorial Esterification, Paul N. Black, Concetta C. Dirusso
Department of Biochemistry: Faculty Publications
INTRODUCTION......................................................................................................................................................454
FATTY ACIDS AND BIOLOGICAL MEMBRANES.............................................................................................455
Fatty Acid Transport Defined ...............................................................................................................................456
MODEL SYSTEMS TO INVESTIGATE FATTY ACID TRANSPORT ..............................................................456
Genetic Foundations of Fatty Acid Transport....................................................................................................456
PROTEINS IMPLICATED IN FATTY ACID TRANSPORT ...............................................................................456
Fatty Acid Translocase..........................................................................................................................................457
Fatty Acid Binding Protein—Membrane Bound ................................................................................................457
Fatty Acid Transport Protein...............................................................................................................................458
The Long-Chain Fatty Acid Transport Protein FadL .......................................................................................458
Fatty Acyl-CoA Synthetase ...................................................................................................................................459
VECTORIAL ACYLATION: ONE MECHANISM OPERATIONAL IN FATTY ACID TRANSPORT...........460
THE BACTERIAL PARADIGM ...............................................................................................................................460
Energetics of Fatty Acid Transport in Gram-Negative Bacteria......................................................................460
The Fatty Acid Transporter FadL........................................................................................................................461
The Fatty Acyl-CoA Synthetase FadD..................................................................................................................461
Structural Considerations of FACS .....................................................................................................................462
FATTY ACID TRANSPORT AND ACTIVATION IN YEAST: …
The Many Faces Of Vitamin B12: Catalysis By Cobalamin-Dependent Enzymes, Ruma Banerjee, Stephen W. Ragsdale
The Many Faces Of Vitamin B12: Catalysis By Cobalamin-Dependent Enzymes, Ruma Banerjee, Stephen W. Ragsdale
Department of Biochemistry: Faculty Publications
Vitamin B12 is a complex organometallic cofactor associated with three subfamilies of enzymes: the adenosylcobalamin-dependent isomerases, the methylcobalamin-dependent methyltransferases, and the dehalogenases. Different chemical aspects of the cofactor are exploited during catalysis by the isomerases and the methyltransferases. Thus, the cobalt-carbon bond ruptures homolytically in the isomerases, whereas it is cleaved heterolytically in the methyltransferases. The reaction mechanism of the dehalogenases, the most recently discovered class of B12 enzymes, is poorly understood. Over the past decade our understanding of the reaction mechanisms of B12 enzymes has been greatly enhanced by the availability of large amounts of enzyme …
Site‐Selective In Vivo Targeting Of Cytosine‐5 Dna Methylation By Zinc‐Finger Proteins, Christopher D. Carvin, Rebecca D. Parr, Michael P. Kladde
Site‐Selective In Vivo Targeting Of Cytosine‐5 Dna Methylation By Zinc‐Finger Proteins, Christopher D. Carvin, Rebecca D. Parr, Michael P. Kladde
Faculty Publications
Cytosine‐5 DNA methylation is a critical signal defining heritable epigenetic states of transcription. As aberrant methylation patterns often accompany disease states, the ability to target cytosine methylation to preselected regions could prove valuable in re‐establishing proper gene regulation. We employ the strategy of targeted gene methylation in yeast, which has a naturally unmethylated genome, selectively directing de novo DNA methylation via the fusion of C5 DNA methyltransferases to heterologous DNA‐binding proteins. The zinc‐finger proteins Zif268 and Zip53 can target DNA methylation by M.CviPI or M.SssI 5–52 nt from single zinc‐factor binding sites. Modification at specific GC (M.CviPI) or CG (M.SssI) …
Further Evaluation Of A Multiplex Pcr For Differentiation Of Salmonella Paratyphi A From Other Salmonellae, Thong Kwai Lin
Further Evaluation Of A Multiplex Pcr For Differentiation Of Salmonella Paratyphi A From Other Salmonellae, Thong Kwai Lin
Thong Kwai Lin
Salmonella enterica serovar Paratyphi A is a causative agent of paratyphoid fever. The clinical syndrome caused by paratyphoid fever overlaps with other febrile illnesses and cannot be distinguished from typhoid fever. Conventional methods used for diagnosis are time consuming, costly, and labor-intensive. We evaluated the specificity, sensitivity, and application of a multiplex polymerase chain reaction (PCR) previously developed by the method (Ou, H.Y, Teh, C.S.J., Thong, K.L., et al., J. Mol. Diagn., 9, 624-630, 2007) using 6 S. Paratyphi A, 22 S. Typhi, and 85 other Salmonella serovars as well as 36 non-Salmonella strains. The detection limit of the multiplex …
Power, Privilege, And Special Interests: Rent Seeking And Subsidies In Agriculture, Matt Bogard
Power, Privilege, And Special Interests: Rent Seeking And Subsidies In Agriculture, Matt Bogard
Agriculture Department Seminar Series
This presentation covers what Public Choice economists refer to as ‘rent seeking,’ generally seeking favor or special privilege from government through subsidies or regulatory advantages. Particularly, the biotech industry is the area of focus for this presentation. Problems with rent seeking in the biotech industry involve less innovation and industry consolidation. Policies related to biotech regulation, school lunch programs, the Clean Air Act, and ethanol subsidies are discussed. A game theoretic approach is used and it is concluded that issues related to rent seeking and special interests are not adequately addressed by recent campaign finance reform efforts. Alternatives such as …
The Problem With The Paleoptera Problem: Sense And Sensitivity, T. Heath Ogden
The Problem With The Paleoptera Problem: Sense And Sensitivity, T. Heath Ogden
T. Heath Ogden
While the monophyly of winged insects (Pterygota) is well supported, phylogenetic relationships among the most basal extant pterygote lineages are problematic. Ephemeroptera (mayflies) and Odonata (dragonflies) represent the two most basal extant lineages of winged insects, and determining their relationship with regard to Neoptera (remaining winged insects) is a critical step toward understanding insect diversification. A recent molecular analysis concluded that Paleoptera (Odonata +Ephemeroptera) is monophyletic. However, we demonstrate that this result is supported only under a narrow range of alignment parameters. We have further tested the monophyly of Paleoptera using additional sequence data from 18SrDNA, 28S rDNA, and Histone …