1,944 research outputs found
AGU hydrology days 2015
No full text2015 annual AGU hydrology days was held at Colorado State University on March 23 - March 25, 2015.The 2015 Hydrology Days Award was presented to Scott W. Tyler
Typification of species of Hieracium s. stricto described by Norrlin from central Scandinavia
No full textTwenty-six names of taxa of Hieracium sections Hieracium, Bifida and Vulgata (Asteraceae) described by the Finnish author J.P. Norrlin based on material from central Sweden and adjacent Norway and originally published in 1888 are lectotypified, and their applications are discussed. The replacement name H. cognatum T. Tyler & Sennikov is proposed as a substitute for the illegitimate H. propinquum (Norrl. ex Hamb.) Johanss., non Sudre
Tyler Stovall, Paris and the Spirit of 1919. Consumer Struggles, Transnationalism, and Revolution
No full textL’ouvrage de Tyler Stovall, professeur à l’université de Californie-Berkeley, marque par son ambition. Investissant une période et un cadre géographique sur lesquels l’historiographie abonde, il parvient en effet à proposer une analyse qui fait bouger les lignes, en mobilisant et en faisant travailler les trois catégories du « triangle de fer » que sont la classe, le genre et la race (p. 112). T. Stovall se focalise sur l’année 1919 qu’il envisage non comme un point de bascule, mais comme un..
Asymptotics for -Core Partitions and Stanton's Conjecture
No full textA partition is a -core partition if is not one of its hook lengths.
Let be the number of -core partitions of . In 1999, Stanton
conjectured if . This was proved for
fixed and sufficiently large by Anderson, and for small values of
by Kim and Rouse. In this paper, we prove Stanton's conjecture in general. Our
approach is to find a saddle point asymptotic formula for , valid in
all ranges of and . This includes the known asymptotic formulas for
as special cases, and shows that the behavior of depends on
how compares in size to . For example, our formula implies that if
, then for suitable constants and defined in terms
of
Microdistribution of Faunal Assemblages at Deep-Sea Hydrothermal Vents in the Southern Ocean
No full textChemosynthetic primary production by microbes supports abundant faunal assemblages at deep-sea hydrothermal vents, with zonation of invertebrate species typically occurring along physico-chemical gradients. Recently discovered vent fields on the East Scotia Ridge (ESR) in the Southern Ocean represent a new province of vent biogeography, but the spatial dynamics of their distinct fauna have yet to be elucidated. This study determines patterns of faunal zonation, species associations, and relationships between faunal microdistribution and hydrothermal activity in a vent field at a depth of 2,400 m on the ESR. Remotely operated vehicle (ROV) dives obtained high-definition imagery of three chimney structures with varying levels of hydrothermal activity, and a mosaic image of >250 m2 of seafloor co-registered with temperature measurements. Analysis of faunal microdistribution within the mosaiced seafloor reveals a consistent pattern of faunal zonation with increasing distance from vent sources and peak temperatures. Assemblages closest to vent sources are visibly dominated by a new species of anomuran crab, Kiwa n. sp. (abundance >700 individuals m?2), followed by a peltospiroid gastropod (>1,500 individuals m?2), eolepadid barnacle (>1,500 individuals m?2), and carnivorous actinostolid anemone (>30 individuals m?2). Peripheral fauna are not dominated by a single taxon, but include predatory and scavenger taxa such as stichasterid seastars, pycnogonids and octopus. Variation in faunal microdistribution on chimneys with differing levels of activity suggests a possible successional sequence for vent fauna in this new biogeographic province. An increase in ?34S values of primary consumers with distance from vent sources, and variation in their ?13C values also indicate possible zonation of nutritional modes of the vent fauna. By using ROV videography to obtain a high-resolution representation of a vent environment over a greater extent than previous studies, these results provide a baseline for determining temporal change and investigations of processes structuring faunal assemblages at Southern Ocean vents
Multi-disciplinary Biopsychosocial Approach in Low Back Pain Benchmark Study
No full textLow back pain (LBP) is the third most common reason people seek care in America and is the primary reason for missed work days. Working in a pain clinic for eight years and managing research studies directed toward improving low back pain in patients was the motivation for choosing the evidence based intervention in this population. The health care professionals (HCP) in the pain clinic usually have a conversation with the patients who have acute or subacute onset of LBP about their disease and give them a written handout with exercises and ask them to perform these exercises at home. As well, they may be prescribed physical therapy or chiropractic care. From personal clinical experience and descriptions in the literature, patients are fearful of performing exercise on their own and do not feel engaged in the process. Observing the disconnect in the patient’s behavior led to the question: In adult patients with low back pain (P) how does the use of a multi-disciplinary biopsychosocial educational approach (I) compared to written educational materials (C) affect pain intensity (O) with twelve weeks of intervention (T) in a pain clinic?
Current guidelines recommend a multi-disciplinary approach with education including self-management instruction, physical therapy/activity, anti-inflammatory medications, and reassurance about the patient’s prognosis along with feedback. The gap in research is how to translate our knowledge in implementing a multidisciplinary approach to an individualized level. For these reasons, the author sought out evidence to support a change in the current practice at a pain clinic
157 - Jordan Tyler Koehn
No full textIncludes bibliographical references.The conformations of long polymers of isoprene units such as those found in the side-chains of lipoquinones involved in bacterial (i.e. Mycobacterium tuberculosis) and eukaryotic electron transport systems (ETS) have not been characterized. First, menaquinone-2 and ubiquinone-2 were synthesized then using 1H-1H 2D NOESY and ROESY NMR spectroscopy, we demonstrated that both molecules adopt a folded, U-shaped conformation in solution and within a model membrane interface. These folded conformations are in stark contrast to the extended conformations seen in literature. Folded conformations likely affect reactivity, function, and recognition within the ETS and provide insight into drug development of potent inhibitors.Great Minds in Research - Honorable Mention
In vivo detection of bile duct pre-cancer with endoscopic light scattering spectroscopy
No full textData from Douglas K. Pleskow, Mandeep S. Sawhney, Paul K. Upputuri, Tyler M. Berzin, Mark F. Coughlan, Umar Khan, Maria Glyavina, Xuejun Zhang, Liming Chen, Conor J. Sheil, Jonah M. Cohen, Edward Vitkin, Yuri N. Zakharov, Irving Itzkan, Lei Zhang, Le Qiu & Lev T. Perelman. 2022. In vivo detection of bile duct pre-cancer with endoscopic light scattering spectroscopy.</p
Increasing author counts in neurosurgical journals from 1980 to 2020
No full textOBJECTIVE: Scientific productivity, as assessed by publication volume, is a common metric by which the academic neurosurgical field assesses its members. The number of authors per peer-reviewed article has been observed to increase over time across a broad range of medical specialties. This study provides an update to this trend in the neurosurgical literature. METHODS: All publications from January 1, 1980, to April 30, 2020, were queried from four neurosurgical journals: Neurosurgery, Journal of Neurosurgery (JNS), JNS: Pediatrics, and JNS: Spine. Publication information was acquired from the National Center for Biotechnology Information Entrez database and reconciled with the Scopus database. Publication type was limited to articles and excluded editorials, letters, and reviews. The number of authors and affiliation counts were determined based on structured abstract fields provided in the two databases. RESULTS: Between January 1, 1980, and April 30, 2020, the overall increase in author count for the four neurosurgical journals was 0.12 to 0.18 authors per year (p \u3c 0.001). For Neurosurgery, the mean (SD) author count increased from 2.81 (1.4) in 1980-1985 to 7.97 (4.92) in 2016-2020 (p \u3c 0.001). For the JNS, the mean (SD) author count increased from 2.82 (1.04) in 1980-1985 to 7.6 (3.65) in 2016-2020 (p \u3c 0.001). The percentage of articles with more than 10 authors increased from 0.2% to 22.3% in Neurosurgery and from 1.9% to 17.5% in JNS. Only 28% of the author count variation was explained by an increasing number of institutional or departmental affiliations. CONCLUSIONS: Author counts for peer-reviewed articles in neurosurgical academic journals have increased significantly during the past 4 decades, with large increases in the numbers of articles with more than 10 authors in the past 5 years. A total of 28% of the variation in this increase can be explained by an increase in multiinstitutional or multidepartmental studies
A comparison of cardiac (31)P MRS at 1.5 and 3 T.
No full text(31)P MRS was evaluated on normal volunteers at 1.5 and 3 T, and the signal-to-noise ratio (SNR) of the two field strengths was calculated. The in vivo spin-lattice, T(1), relaxation times for PCr and gamma-ATP, which are essential for correcting for the effects of radiofrequency saturation on the PCr/ATP ratio, were determined at 3 T. The T(1) values for six volunteers were 3.8 +/- 0.7 s for PCr (mean +/- SD) and 2.4 +/- 1.1 s for gamma-ATP, which are similar to reported values at 1.5 T, allowing us to use protocols developed at 1.5 T at the new clinical field strength of 3 T. Direct comparison between 1.5 T and 3 T in the same 10 subjects, using coils of identical geometry and identical pulse sequences gave a mean SNR for PCr at 3 T which was 206 +/- 94% of that at 1.5 T. The linewidth for PCr increased from 13 +/- 6 Hz at 1.5 T to 22 +/- 12 Hz at 3 T. The coefficient of variation in the measurement of PCr/ATP, based on the Cramer-Rao lower bounds, was reduced from 32 +/- 25% at 1.5 T to 18 +/- 13% at 3 T. Thus, (31)P MRS at 3 T is greatly improved by the increase in SNR compared with acquisitions at 1.5 T because of the higher field strength
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