226 - 250 of 7,138
Number of results to display per page
CreatorTitleDescriptionSubjectDate
226 Low-field relaxation and the study of ultraslow atomic motions by magnetic resonanceConventional resonance enables one to study motion of atoms by measurement of line width when the mean time r between jumps is less than 1/Aco, where Aa> is the rigid lattice line width, or by measurement of the spin-lattice relaxation time, Ti, when r ^ l / coo , where coo is the Larmor frequency. ...Ultraslow atomic motion; Magnetic resonance1964
227 Coping with methuselah the impact of molecular biology on medicine and societyThe prospect of extra-long life spawns a bloom of ethical issues, among them how to achieve intergenerational equity; how to balance health care entitlements with rising costs for the elderly; how to divide years of life between work and retirement; how to assign the responsibilities of young family...2004
228 Improvements to the finite-difference time-domain method for calculating the radar cross section of a perfectly conducing targetThe finite-difference time-domain (FDTD) method has been used extensively to calculate scattering and absorption from both dielectric objects and perfectly conducting objects. Several improvements to the FDTD method for calculating the radar cross section (RCS) of a perfectly conducting target are p...Finite-difference time-domain; FDTD1990-01-01
229 Genetic variation at the MCIR Locus and the time since loss of human body hairThe melanocortin I receptor (MCIR) locus makes a protein that affects the color of skin and hair. At this locus, amino-acid differences are entirely absent among African humans, abundant among non-Africans (especially Europeans), and abundant in chimpanzee/human comparisons (Rana et al. 1999, Hardin...Nonsynonymous; Chimpanzee; Constraint2004
230 IAIMS Newsletter October 1995The IAIMS Newsletter provides valuable information about Library activities and resources as well as informative articles related to information technology.IAIMS1995
231 Quantitative assessment of pulmonary edema by nuclear magnetic resonance methodsConsiderable progress has been made in the application of nuclear magnetic resonance (NMR) imaging and nonimaging techniques to the quantitative assessment of pulmonary edema. NMR measurements offer the advantages of being noninvasive, relatively rapid, and easily repeatable. In addition, NMR imagin...Quantitative assessment1988
232 On a potential global role for vitamin K-dependent γ-carboxylation in animal systemsThe vitamin K-dependent γ-carboxylation of glutamate to γ-carboxyglutamate was originally well characterized in the mammalian blood clotting cascade. γ-Carboxyglutamate has also been found in a number of other mammalian proteins and in neuropeptides from the venoms of marine snails belonging to...Carboxylation; Glutamate; Carboxyglutamate; Carboxylase mRNA; Conantokin G2001
233 Resonant two-photon ionization spectroscopy of jet-cooled OsN: 520?418 nmThe optical transitions of supersonically cooled OsN have been investigated in the range from 19 200 to 23 900 cm?1 using resonant two-photon ionization spectroscopy. More than 20 vibronic bands were observed, 17 of which were rotationally resolved and analyzed. The ground state is confirmed to be 2...2011
234 Information extraction as a stepping stone toward story understandingHistorically story understanding systems have depended on a great deal of handcrafted knowledge. Natural language understanding systems that use conceptual knowledge structures (Schank and Abelson 1977; Cullingford 1978; Wilensky 1978; Carbonell 1979; Lehnert 1981; Kolodner 1983) typically rely on ...Information extraction; Story understanding1999
235 Electronics, music and computersElectronic and computer technology has had and will continue to have a marked effect in the field of music. Through the years scientists, engineers, and musicians have applied available technology to new musical instruments, innovative musical sound production, sound analysis, and musicology. At the...Computers; Music1971
236 Real time PCR assay for the detection of CMV using eclipse hybridization probesWe developed a qualitative real time PCR assay to detect CMV in patient samples, using a novel hybridization probe termed the Eclipse probe (Epoch Biosciences). These are single probes with a fluorescent molecule attached to the 3' end and a dark quencher on the 5' end. Also conjugated to the 5' end...Tissues Analysis; Elegans2004-08-11
237 Multidimensional transfer functions for interactive volume renderingAbstract-Most direct volume renderings produced today employ one-dimensional transfer functions which assign color and opacity to the volume based solely on the single scalar quantity which comprises the data set. Though they have not received widespread attention, multidimensional transfer function...2002-07
238 Caenorhabditis elegans rab-3 mutant synapses exhibit impaired function and are partially depleted of vesiclesRab molecules regulate vesicular trafficking in many different exocytic and endocytic transport pathways in eukaryotic cells. In neurons, rab3 has been proposed to play a crucial role in regulating synaptic vesicle release. To elucidate the role of rab3 in synaptic transmission, we isolated and cha...1997
239 Analytical characteristics of ICAT-LC-MS/MS for quantitative proteomics studiesRecent studies have employed isotope-coded affinity tags (ICAT) in concert with tandem mass spectrometry (MS/MS) to assess differential expression of proteins on a proteomic scale and perform unbiased quantitative comparisons between samples from different physiological or disease states. We sought ...isotope-coded affinity tags; ICAT; mass spectrometry; MS/MS; proteomic scale; FL2005-06-03
240 Long-term stimulation and recording with a penetrating microelectrode array in cat sciatic nerveWe studied the consequences of long-term implantation of a penetrating microelectrode array in peripheral nerve over the time course of 4-6 mo. Electrode arrays without lead wires were implanted to test the ability of different containment systems to protect the array and nerve during contractions o...Cats; Microelectrodes; Prosthesis Implantation; Sciatic Nerve2004
241 Too many? Too few. New study reveals current trends in U. S. neurosurgical workforceRemarkable changes in the neurosurgical specialty have taken place in the past 15 years. While advances in basic science have occurred and new technologies and therapies have proliferated, other, less propitious factors-such as the promises (some might say false promises) and hopes of managed care-h...2003-01-01
242 Neighborhood environment and health in old age: what role do individual characteristics play in this link?This research investigates the relationship among objectively assessed neighborhood SES, subjective perceptions of neighborhood environment, and self-rated physical health among older persons. We further explore the structural and psychosocial mechanisms at the individual level underlying the observ...Community; District; Geriatric; Elderly; Healthcare2004-01-16
243 Evaluation of a CT-based coal washability analysis system under simulated on-line conditionsThe appropriate software and hardware necessary to adapt an X-ray CTanalyzerfor the determination of coal washability was developed and successfully tested for well-characterized samples under laboratory conditions. Evaluation of the CT-based analyzer under simulated on-line conditions is also prese...Coal washability; Computer simulation; X-ray CT analysis2002
244 Timing constraints for high speed counterflow-clocked pipeliningWith the escalation of clock frequencies and the increasing ratio of wire- to gate-delays, clock skew is a major problem to be overcome in tomorrow's high-speed VLSI chips. Also, with an increasing number of stages switching simultaneously comes the problem of higher peak power consumption. In our ...Timing constraints; clock frequencies; clock skew; high-speed; VLSI chips; counterflow-clocked pipelining1995
245 PPL quick reference guide (NMOS)This work was supported in part by Defense Research Projects Agency under Contract Number DAAK1184K0017. All opinions, findings, conclusions or recommendations expressed in this document are those of the author(s) and do not necessarily reflect the view of DARPA.NMOS1986
246 CFH Y402H Confers similar risk of soft Drusen and both forms of advanced AMDBACKGROUND: Age-related macular degeneration (AMD) is the most common cause of irreversible visual impairment in the developed world. The two forms of advanced AMD, geographic atrophy and neovascular AMD, represent different pathological processes in the macula that lead to loss of central vision. S...2005
247 Femtosecond optical detection of quasiparticle dynamics in high-Tc YBa2Cu3O7- 8 superconducting thin filmsFemtosecond dynamics of photogenerated quasiparticles in YBa2Cu307-δ superconducting thin films shows at T ≤ Tc two main electronic processes: (i) quasiparticle avalanche production during hot-carrier thermalization, which takes about 300 fsec; (ii) recombination of quasiparticles to form Cooper ...Quasiparticle dynamics; High-Tc; Femtosecond dynamics; Photogenerated quasiparticles1990-11
248 Change processes in relationships: a relational-historical research approachThis work was supported by grants to Alan Fogel from the National Institute of Health (R01 HD21036), the National Science Foundation (BNS9006756) and the National Institute of Mental Health (R01MH48680), and by a grant to Andrea Garvey from the National Science Foundation of Brazil (CNPq). We grate...2006
249 A stable adaptive Hammerstein filter employing partial orthogonalization of the input signalsAbstract This paper presents an algorithm that adapts the parameters of a Hammerstein system model. Hammerstein systems are nonlinear systems that contain a static nonlinearity cascaded with a linear system. In this work, the static nonlinearity is modeled using a polynomial system and the linear f...2002
250 Solvent refining of coal resin concentratesCertain bituminous coals of the western United States are known to contain appreciable quantities of macroscopic resinite (fossil resin). Such resinous coals are found in the states of Arizona, Colorado, New Mexico, Utah, Washington, Wyoming, etc. Among these, the Wasatch Plateau coal field in ce...1994
226 - 250 of 7,138