UScholar Works
 
Filters: Department: "Bioengineering" Collection: "ir_uspace" Year Start: 1953
76 - 100 of 128
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CreatorTitleDescriptionSubjectDate
76 Normann, Richard A.; Maynard, Edwin M.Neuronal interactions improve cortical population coding of movement directionInteractions among groups of neurons in primary motor cortex (MI) may convey information about motor behavior. We investigated the information carried by interactions in MI of macaque monkeys using a novel multielectrode array to record simultaneously from 12-16 neurons during an arm-reaching task. ...Motor Cortex; Monkey; Population Coding; Movement1999
77 Horch, Kenneth W.; Normann, Richard A.Noble metal penetrating cortical stimulating electrode array: preliminary resultsElectrical stimulation of the visual cortex causes subjects to see spots of light (phosphenes) in their visual fields. We have developed arrays of penetrating electrodes which may from the basis of a visual prosthesis centered around electrical stimulation of the visual cortex. These arrays have bee...Visual prosthesis1988
78 Horch, Kenneth W.On the number and nature of regenerating myelinated axons after lesions of cutaneous nerves in the cat1. Electrophysiological and anatomical techniques were used to investigate normal and regenerating sural and posterior femoral cutaneous nerve fibres in the cat. 2. One and a half years after transection of these nerves it was found that the regenerating neurones supported multiple sprouts in the...Nerve fibres; Transection; Nerve injury1981
79 Horch, Kenneth W.Ontogeny of diving and feeding behavior in juvenile seaturtles: Leatherback Seaturtles (Dermochelys coriacea L) and Green Seaturtles (Chelonia mydas L) in the Florida CurrentWe compared activity, diving behavior and response to prey by Dermochelys coriacea and Chelonia mydas during their first 8-10 weeks of development.We reared juveniles in the laboratory and, at two-week intervals, released them in the ocean for a brief trial. Each turtle towed a device used to measur...Hatchlings; Posthatchling; Habitats2004
80 Christensen, Douglas A.; Herron, James N.Optical immunoassay systems based upon evanescent wave interactionsImmunoassays based upon evanescent wave interactions are finding increased biosensing application. In these devices, the evanescent tail associated with total internal reflection of an incident beam at the substrate/solution interface provides sensitivity for surface-bound proteins over bulk molec...Diagnostics; Evanescence; Planar waveguides; Human chorionic gonadotropin (hCG)1996
81 Gesteland, Raymond F.; Atkins, John F.Origin and destiny of adenovirus proteinsLytic infection of human cells by adenovirus proceeds by a temporal expression of genes. Classically two phases have been defined: an early phase, which includes events occurring before the onset of DNA synthesis (8 hours), and a late phase, including events whose existence depends on the onset of...Protein Biosynthesis; DNA, Viral; Adenoviridae; RNA, Viral; Time Factors1975
82 Normann, Richard A.Oscillations in rod and horizontal cell membrane potential: evidence for feed-back to rods in the vertebrate retina1. Rods and horizontal cells were studied with intracellular recordings in the retina of the toad, Bufo marinus; 161 cells were from the eyecup preparation and thirty were from the isolated perfused retina. 2. Of these cells, 39% exhibited either transient or sustained oscillations of membrane poten...Retina; Photoreceptors; Toads; Adaptation, Ocular1976
83 Gesteland, Raymond F.; Atkins, John F.; Baranov, Pavel V.P-site tRNA is a crucial initiator of ribosomal frameshiftingThe expression of some genes requires a high proportion of ribosomes to shift at a specific site into one of the two alternative frames. This utilized frameshifting provides a unique tool for studying reading frame control. Peptidyl-tRNA slippage has been invoked to explain many cases of programmed ...Translation; Recoding; Kinetic Model; Frameshifting; Ribosome2004
84 Gesteland, Raymond F.Pattern of protein synthesis in monkey cells infected by simian virus 40After infection of several permanent monkey cell lines by simian virus 40 (SV40), four additional protein bands can be detected by simple sodium dodecyl sulfate-polyacrylamide gel electrophoresis of whole-cell extracts. These bands appear only after the onset of viral deoxyribonucleic acid (DNA) syn...Monkeys; Simian virus 40; Peptides; DNA, Viral/biosynthesis1972
85 Horch, Kenneth W.Perspectives on new electrode technology for stimulating peripheral nerves with implantable motor prosthesesAbstract-The limits of present electrode technology are being reached in current motor prostheses for restoring functional movement in paralyzed people. Improved devices require electrodes and stimulation methods that will activate muscles selectively and independently with less implanted hardwa...Paralysis; Prostheses; Electrodes1995
86 Baehr, Wolfgang; Prestwich, Glenn D.Photoreceptor cGMP phosphodiesterase delta subunit (PDEdelta) functions as a prenyl-binding proteinBovine PDEdelta was originally copurified with rod cGMP phosphodiesterase (PDE) and shown to interact with prenylated, carboxymethylated C-terminal Cys residues. Other studies showed that PDEdelta can interact with several small GTPases including Rab13, Ras, Rap, and Rho6, all of which are prenylate...Fluorescence Resonance Energy Transfer; GTP Phosphohydrolases; Immunohistochemistry2004
87 Christensen, Douglas A.Planar waveguide biosensors for nucleic acid hybridization reactionsOligonucleotide probes derived from (1) the T3 RNA polymerase promoter sequence (T3) and (2) prostate-specific antigen messenger RNA (PSA) were prepared and labeled with a red-emitting fluorescent dye (Cy5). The complimentary oligonucleotides (anti T3 and anti PSA) were prepared and labeled with bio...Planar waveguides; Evanescence; Fluorescence; Glandular kallikrein; MDx; Molecular diagnostics; Nucleic acid; PSA; Oligonucleotide probes2000
88 Christensen, Douglas A.Plasma-etched polymer waveguides for intrachip optical interconnectsOptical intrachip communication offers the potential advantages of high speed and lack of electrical interference. We report on progress made on an interconnect design using GaAs LEDs, polymer waveguides, and photodiodes in a silicon substrate. The polymer waveguides are fabricated in polyimide or p...Polymer waveguides; Intrachip interconnects; LEDs1998
89 Lam, LeAnnPre-clinical animal model for ovarian cancer using live imaging systemDevelopment of a live imaging animal model for orthotopic ovarian cancers in order to better understand disease mechanisms and response to potential anticancer drug treatments.Ovarian cancer; Cancer; Animal model; Live imaging; Cell culture; ACCESS2015-04-14
90 Gesteland, Raymond F.; Atkins, John F.; Felden, Brice; McCutcheon, John P.Probing the structure of the Escherichia coli 10Sa RNA (tmRNA)The conformation of the Escherichia coli 10Sa RNA (tmRNA) in solution was investigated using chemical and enzymatic probes. Single- and double-stranded domains were identified by hydrolysis of tmRNA in imidazole buffer and by lead(II)-induced cleavages. Ribonucleases T1 and S1 were used to map unpai...Covariation; Pseudoknot; Structural Probing; 10Sa RNA; tmRNA1997
91 Christensen, Douglas A.; Furse, Cynthia M.Problem and treatment of DC offsets in FDTD simulationsThis paper discusses the causes of and some solutions to the commonly observed problem of dc field offsets in finite-difference time-domain (FDTD) simulations. DC electric and magnetic field offsets are shown to be valid calculated responses of the modeled systems, resulting from interaction betwee...Finite-difference time-domain method; Direct current offsets; Waveforms2000-08
92 Gesteland, Raymond F.Processing of adenovirus 2-induced proteinsAnalysis of (35)S-methionine-labeled extracts of adenovirus 2-infected KB cells revealed 22 virus-induced polypeptide components. Most proteins of the virion were easily detected in extracts of whole cells labeled for short periods between 15 and 30 h after infection; however, several virion compone...Adenoviridae; Viral Proteins; Protein Precursors; Methionine; Mouth Neoplasms1973
93 Horch, Kenneth W.Proposed specifications for a lumbar spinal cord electrode array for control of lower extremities in paraplegiaThe goal of the study was to provide specifications for a stimulating electrode array to be implanted in the lumbosacral spinal cord as part of a functional neuromuscular stimulation (FNS) system for control of lower extremity muscles in paralyzed individuals. Dual channel stimulation of the qua...Stimulating electrode array; FNS; Functional neuromuscular stimulation1997
94 Christensen, Douglas A.Pulsed Schlieren system for visualizing beams from phased-array HIFU applicatorsWe have assembled a Schlieren system for imaging the beam patterns from HIFU transducers in water to verify the desired beam focusing and direction. It consists of a high power (65 mW) short-pulse (as short as 2 ns) laser emitting at 658 nm, a beam expander/spatial filter, water tank, 400 Jim round ...Ultrasound beam patterns; Pulsed laser; Wavefronts2007
95 Christensen, Douglas A.; Herron, James N.Rapid clinical diagnostics assays using injection-molded planar waveguidesThe goal of our research program is to develop an evanescent wave immunoassay system that can be used in point-of-care and critical care settings. Several key attributes are required to accomplish this goal: (i) the assay system should be at least as sensitive as present day immunoassays; (ii) assay...Planar waveguides; Creatine phosphokinase MB (CK-MB); Cardiac troponin I (cTnl); Diagnostics; Evanescence; Fluorescence; Human chorionic gonadotropin (hCG)1998
96 Christensen, Douglas A.; Herron, James N.Rapid single nucleotide polymorphism detection for personalized medicine applications using planar waveguide fluorescence sensorsPersonalized medicine is an emerging field in which clinical diagnostics information about a patient's genotype or phenotype is used to optimize his/her pharmacotherapy. This article evaluates whether planar waveguide fluorescent sensors are suitable for determining such information from patient tes...Personalized medicine; Planar waveguides; Fluorescence sensors; Evanescent excitation; Fluorescence; Hybridization; Molecular diagnostics; Peptide nucleic acid; Point of care; Single base extension; Single nucleotide polymorphism2006
97 Christensen, Douglas A.Resonant inductive applicator for neck hyperthermiaWe have designed and phantom tested an inductive applicator especially suited for producing hyperthermia in cancerous regions in the neck. The applicator is tuned to resonate near 27 MHz; its inductive nature has the advantage of efficient coupling to the irregular neck anatomy. An inhomogeneou...Hyperthermia applicator; Phantom tests1989
98 Varner, Michael W.; Clark, Edward B.; Fernando, Kumari L.; Mathews, V. JohnRobust estimation of fetal heart rate variability using Doppler ultrasound.This paper presents a new measure of heart rate variability (HRV) that can be estimated using Doppler ultrasound techniques and is robust to variations in the angle of incidence of the ultrasound beam and the measurement noise. This measure employs the multiple signal characterization (MUSIC) algori...Prenatal Ultrasonography; Fetal Heart Rate; Blood Flow Velocity; Algorithms2003-08
99 Gesteland, Raymond F.; Atkins, John F.; Wills, Norma M.rRNA-mRNA base pairing stimulates a programmed -1 ribosomal frameshiftBase pairing between the 3' end of 16S rRNA and mRNA is shown to be important for the programmed -1 frameshifting utilized in decoding the Escherichia coli dnaX gene. This pairing is the same as the Shine-Dalgarno pairing used by prokaryotic ribosomes in selection of translation initiators, but for ...Frameshifting; Escherichia coli; Binding Sites; Base Composition1994
100 Horch, Kenneth W.Selective activation of functional muscle groups through stimulation of spinal motor poolsA microelectrode was used to stimulate motor neurons in the lumbo-sacral spinal cord of adult cats. Consistent with spinal cord anatomical studies, we found that the motor neurons responsible for activation of individual muscle groups are situated together in specific areas of the cord, forming mot...Spinal motor pools1993
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