2,828 research outputs found

    Convoluted fabric for full-pressure gloves

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    Fabric, made of nylon ripstop coated with Neoprene, provides expansive and contractive mobility along posterior surface of glove fingers allowing maximum digital dexterity and tactility

    Expanding the application of the Eu-oxybarometer to the lherzolitic shergottites and nakhlites: Implications for the oxidation state heterogeneity of the Martian interior

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    Experimentally rehomogenized melt inclusions from the nakhlite Miller Range 03346 (MIL 03346) and the lherzolitic shergottite Allan Hills 77005 (ALH 77005) have been analyzed for their rare earth element (REE) concentrations in order to characterize the early melt compositions of these Martian meteorites and to calculate the oxygen fugacity conditions they crystallized under. D(Eu/Sm)pyroxene/melt values were measured at 0.77 and 1.05 for ALH 77005 and MIL 03346, respectively. These melts and their associated whole rock compositions have similar REE patterns, suggesting that whole rock REE values are representative of those of the early melts and can be used as input into the pyroxene Eu-oxybarometer for the nakhlites and lherzolitic shergottites. Crystallization fO_2 values of IW + 1.1 (ALH 77005) and IW + 3.2 (MIL 03346) were calculated. Whole rock data from other nakhlites and lherzolitic shergottites was input into the Eu-oxybarometer to determine their crystallization fO_2 values. The lherzolitic shergottites and nakhlites have fO_2 values that range from IW + 0.4 to 1.6 and from IW + 1.1 to 3.2, respectively. These values are consistent with some previously determined fO_2 estimates and expand the known range of fO_2 values of the Martian interior to four orders of magnitude. The origins of this range are not well constrained. Possible mechanisms for producing this spread in fO_2 values include mineral/melt fractionation, assimilation, shock effects, and magma ocean crystallization processes. Mineral/melt partitioning can result in changes in fO_2 from the start to the finish of crystallization of 2 orders of magnitude. In addition, crystallization of a Martian magma ocean with reasonable initial water content results in oxidized, water-rich, late-stage cumulates. Sampling of these oxidized cumulates or interactions between reduced melts and the oxidized material can potentially account for the range of fO_2 values observed in the Martian meteorites

    Increased Microdialysis Recovery of Large Molecular Weight Analytes via Ultrafiltration

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    Microdialysis is a sampling method based on the passive diffusion of solutes across a semi-permeable hollow-fiber membrane that is driven by a concentration gradient. The membrane has a defined molecular weight cutoff, which causes larger molecular solutes such as proteins with molecular weights of approximately 8-80 kDa to have low recoveries. The purpose of this research is to utilize ultrafiltration across the membrane through push-pull and vacuum ultrafiltration methods as a means to increase recovery of large molecular weight analyte. These experiments were carried out using Methyl Orange (MO), Fluorescein Isothiocyanate 4 kDa (FITC-4), and Fluorescein Isothiocyanate 40 kDa (FITC-40). In comparison to conventional microdialysis, using push-pull methods (1 uL/min push with 1, 2, 3, 4, 5, and 8 uL/min pull, respectively) increased MO recovery up to 12%, FITC-4 recovery up to 47%, and FITC-40 recovery up to 37%. In comparison to conventional microdialysis, vacuum ultrafiltration methods (0 uL/min push with 1, 2, 3, 4, 5, and 8 uL/min pull, respectively) increased MO recovery up to 30%, FITC-4 recovery up to 64%, and FITC-40 recovery up to 87%

    Head Capsule of the Hemipteran, Triatoma sanguisuga (LeConte)

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    The problem is difficult of selecting a generalized head typical for the suborder Heteroptera. Spooner (1938) used two principal characters as a basis for working out the phylogenetic affinities of hemipterous head capsules; subsequently, he had to use other characteristics to further subdivide the group

    A New Species of Metapterus (Hemiptera, Reduviidae)

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    Chagas Disease and Vectors in North Central Texas

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    All members of the large hemipterous family Reduviidae are predacious, but only members of the subfamily Triatominae feed exclusively on vertebrate blood. Readio (1927) noted that Mr. J. R. Lembert observed the common Pacific Coast species of Triatoma feeding on carrion and excrement. Lutz (1918) reported that Triatoma sanguisuga LeConte feeds on insects, including grasshoppers and potato beetles. Apparently neither of the above accounts illustrate normal feeding habits

    Hypnosis for acute procedural pain: a critical review

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    Clinical evidence for the effectiveness of hypnosis in the treatment of acute procedural pain was critically evaluated based on reports from randomized controlled clinical trials (RCTs). Results from the 29 RCTs meeting inclusion criteria suggest that hypnosis decreases pain compared to standard care and attention control groups and that it is at least as effective as comparable adjunct psychological or behavioral therapies. In addition, applying hypnosis in multiple sessions prior to the day of the procedure produced the highest percentage of significant results. Hypnosis was most effective in minor surgical procedures. However, interpretations are limited by considerable risk of bias. Further studies using minimally effective control conditions and systematic control of intervention dose and timing are required to strengthen conclusions
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