Filters: Collection:"ir_uspace"
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 76 |  | Adler, Frederick R. | Is space necessary? Interference competition and limits to biodiversity | A single trade-off between competitive ability and mortality has been shown to support an arbitrarily large number of species in models of interference competition in spatially structured populations. We show that this results not from spatial structure, but instead from the assumption that a small ... | Mortality rate; Competitive ability; Seed size | 2000 |
| 77 |  | Olivera, Baldomero M.; McIntosh, J. Michael | Isolation and characterization of a novel Conus peptide with apparent antinociceptive activity | Cone snails are tropical marine mollusks that envenomate prey with a complex mixture of neuropharmacologically active compounds. We report the discovery and biochemical characterization of a structurally unique peptide isolated from the venom of Conus marmoreus. The new peptide, mr10a, potently incr... | Conotoxins; Conus peptides; Conus marmoreus; mr10a; antinociceptive activity | 2000 |
| 78 |  | Silverman, Randall H. | Jackets recommended: the case for preserving dust jackets in research libraries | This paper will provide a historical overview of dust jackets and present a cost-effective mass approach to their treatment. Research libraries generally treat dust jackets as extraneous to the physical integrity of new acquisitions and consequently discard them as part of the shelf preparation p... | 2000 | |
| 79 |  | Capecchi, Mario R. | Lack of angiotensin II-facilitated erythropoiesis causes anemia in angiotensin-converting enzyme-deficient mice | While nephrologists often observe reduced hematocrit associated with inhibitors of angiotensin-converting enzyme (ACE), the basis for this effect is not well understood. We now report that two strains of ACE knockout mice have a normocytic anemia associated with elevated plasma erythropoietin level... | 2000 | |
| 80 |  | Weinstein, David | Localization of multiple deep epileptic sources in a realistic head model via independent component analysis | Estimating the location and distribution of current sources within the brain from electroencephalographic (EEG) recordings is an ill-posed inverse problem. The ill-posedness of the problem is due to a lack of uniqueness in the solution; that is, different configurations of sources can generate ident... | EEG; Current sources; Head model | 2000 |
| 81 |  | Shaw, Janet M. | Long-term exercise using weighted vests prevents hip bone loss in postmenopausal women | Background. Bone mineral density (BMD) is a primary risk factor for hip fracture. We studied the effect of long-term weighted vest plus jumping exercise on hip BMD in postmenopausal women as a strategy for reducing hip fracture risk. Methods. Eighteen postmenopausal women (age 5 64.1 6 1.6 years a... | 2000 | |
| 82 |  | Miller, Joel Steven; Epstein, Arthur J. | Magnetic properties and critical behavior of Fe(tetracyanoethylene) 2.x(CH2Cl2): a high-Tc molecule-based magnet | We report magnetic studies of Fe(TCNE)2•x(CH2Cl2), a member of the family of high-Tc molecule-based magnets, M(TCNE)x•y (solvent) (M=V, Mn, TCNE=tetracyanoethelyne). Based on extensive static and dynamic magnetic measurements we show that this system has a complex magnetic behavior, with a mixtu... | Solvent; Anisotropy; Spin | 2000 |
| 83 |  | Miller, Joel Steven | Manganese(II)octabutoxynaphthalocyanine and its ferrimagnetic electron-transfer salt with TCNE | The magnetic susceptibility (x) of 1,6,10,15,19,25,28,32- octa-n-butoxynaphthalocyaninatomanganese(III) tetracyanoethanide can be fit to a Curie-Weiss expression with O=54 K for T>150 K, and the xT(T) data are consistent with linear chains and can be fit to a Seiden expression for alternating S=2 a... | Magnetic; Ordering; Magnetization | 2000 |
| 84 |  | Balasubramonian, Rajeev | Memory hierarchy reconfiguration for energy and performance in general-purpose processor architectures | Conventional microarchitectures choose a single memory hierarchy design point targeted at the average application. In this paper we propose a cache and TLB layout and design that leverages repeater insertion to provide dynamic low-cost configurability trading of size and speed on a per application ... | Translation lookaside buffer (TLB) | 2000 |
| 85 |  | Freire, Juliana | MetaComm: a meta-directory for telecommunications | A great deal of corporate data is buried in network devices - such as PBX messaging/email platforms, and data networking equipment - where it is difficult to access and modify. Typically, the data is only available to the device itself for its internal purposes and it must be administered using eith... | MetaComm; Meta-Directories; Directory Enabled Networking; Data integration | 2000 |
| 86 |  | Adams, Daniel | Micromechanical modeling of high energy composites | High-energy polymer-binded explosives (PBXs) are composed of high-energy crystaline particles and a rubbery binder. The volume fraction of particles is approximately 92 percent. The high-energy particles have a Young's modulus that is three orders of magnitude higher than that of the binder. Eff... | 2000 | |
| 87 |  | Davidson, Diane W. | Microtopography of microbiotic crusts on the Colorado Plateau, and distribution of component organisms | We analyzed the microtopography of microbiotic soil crusts at 3 sites on the Colorado Plateau of southern Utah and investigated distributions of cyanobacteria and several lichens in distinctive microhabitats created by this topography. At all 3 sites the long axes of linear soil mounds were oriented... | Microtopography; Microbiotic crusts; Colorado Plateau; Cryptobiotic soil; Colonization; Nonrandom orientation; Exposure; Collema; Disturbance history; Microhabitat | 2000 |
| 88 |  | Millgram, Elijah | Mill's proof of the principle of utility | Mill's utilitarianism is very closely tied to his instrumentalism; that his argument for the Principle of Utility, while tight, is deeply incoherent; that the incoherence stems from an incoherence in instrumentalism; and that Mill's instrumentalism turns out to have been an island of apriorism in ... | Utility; Happiness; Rationalism | 2000 |
| 89 |  | Nichols, Shaun | Mind's "I" and the theory of mind's "I": introspection and two concepts of self | Introspection plays a crucial role in modern Philosophy; in two different ways. From the beginnings of modern Philosophy;, introspection has been used as a tool for philosophical exploration in a variety of thought experiments. But modern philosophers (e.g., Locke and Hume) also tried to characteri... | Introspection; Self; Self-awareness; Cognition | 2000 |
| 90 |  | Clayton, Dale H. | Molecular phylogeny of the dove genus Zenaida: mitochondrial and nuclear DNA sequences | We reconstructed a phylogeny for the seven species of doves in the genus Zenaida on the basis of a combined analysis of mitochondria (ND2 and cytochrome b) and nuclear (fibrinogen intron 7) DNA sequences. This phylogeny, which is completely resolved, is well supported with all nodes showing greater... | Molecular phylogeny; Dove; Nuclear DNA | 2000 |
| 91 |  | Miller, Joel Steven; Epstein, Arthur J. | Molecule-based magnets - an overview | Molecule-based* magnets are a broad, emerging class of magnetic materials that expand the materials properties typically associated with magnets to include low density, transparency, electrical insulation, and low-temperature fabrication, as well as combine magnetic ordering with other proper... | Spin; Magnetization; Magnetic ordering | 2000 |
| 92 |  | Horch, Kenneth W. | Muscle recruitment through electrical stimulation of the lumbo-sacral spinal cord | The goal of this study was to determine the feasibility of producing graded muscle contraction in individual muscles or muscle groups by electrically stimulating motor neurons in the lumbo-sacral spinal cord. Recruitment curves were obtained for quadriceps, tibialis anterior and triceps surae/pl... | Functional neuromuscular stimulation (FNS); Motor pools, Muscle recruitment, Spinal cord stimulation | 2000 |
| 93 |  | Jorgensen, Erik | Mutations in synaptojanin disrupt synaptic vesicle recycling | Synaptojanin is a polyphosphoinositide phosphatase that is found at synapses and binds to proteins implicated in endocytosis. For these reasons, it has been proposed that synaptojanin is involved in the recycling of synaptic vesicles. Here, we demonstrate that the unc-26 gene encodes the Caenorhab... | 2000 | |
| 94 |  | Jorgensen, Erik | Mutations in β-spectrin disrupt axon outgrowth and sarcomere structure | B-Spectrin is a major component of the membrane skeleton, a structure found at the plasma membrane of most animal cells. B-Spectrin and the membrane skeleton have been proposed to stabilize cell membranes, generate cell polarity, or localize specific membrane proteins. We demonstrate that the Caen... | 2000 | |
| 95 |  | Schmidt, Meic H. | NASA light-emitting diode medical program-progress in space flight and terrestrial applications | This work is supported and managed through the NASA Marshall Space Flight Center - SBIR Program. Studies on cells exposed to microgravity and hypergravity indicate that human cells need gravity to stimulate cell growth. As the gravitational force increases or decreases, the cell function responds in... | Terrestrial applications; Cell growth; NASA; Microgravity environment | 2000 |
| 96 |  | Ailion, David Charles | Nature of the incommensurate-paraelectric transition: a two dimensional exchange-difference NMR study | 87Rb two-dimensional exchange-difference NMR was used to study collective motions in the incommensurate (I) and paraelectric (P) phases of Rb2ZnCl4, which elucidate the nature of the I-P transition. We measured the cross-peak frequency displacement vs mixing time and observed a gradual increase towa... | Incommensurate systems; NMR; Paraelectric phase | 2000 |
| 97 |  | Gondolo, Paolo | Neutralino dark matter vs galaxy formation | Neutralino dark matter may be incompatible with current cold dark matter models with cuspy dark halos, because excessive synchrotron radiation may originate from neutralino annihilations close to the black hole at the galactic center. | Neutralinos; Cuspy dark halos | 2000 |
| 98 |  | Landesman, Margaret M. | New challenges for scholarly communication in the digital era - changing roles and expectations in the academic community: a scholarly report | This conference, co-sponsored by the Association of Research Libraries, the American Association of University Professors, the American Council of Learned Societies, the Association of American University Presses, and the Coalition for Networked Information, was held March 26-27, 1999, in Washington... | Digital publication; Distance education; E-print | 2000 |
| 99 |  | Shirley, Peter S.; Thompson, William B. | Night rendering | The issues of realistically rendering naturally illuminated scenes at night are examined. This requires accurate models for moonlight, night skylight, and starlight. In addition, several issues in tone reproduction are discussed: eliminatiing high frequency information invisible to scotopic (night v... | Night rendering; Low light -- Computer models | 2000 |
| 100 |  | Miller, Joel Steven | Noncollinear antiferromagnetic structure of the molecule-based magnet Mn[N(CN)2]2 | The crystallographic and magnetic properties of the Mn[N(CN)2]2 compound have been investigated by dc magnetization, ac susceptibility, specific heat, and zero-field neutron diffraction on polycrystalline samples. The magnetic structure consists of two sublattices which are antiferromagnetically cou... | Spin; Crystal; Magnetic | 2000 |