134 research outputs found
Applications of luminescence techniques to the study of the lunar surface
Optical fluorescence spectra of rock-forming minerals for identifying mineral grains found on lunar surfac
Developments in quantitative luminescence techniques
Developments in quantitative luminescence technique
Effective swimming strategies in low Reynolds number flows
The optimal strategy for a microscopic swimmer to migrate across a linear
shear flow is discussed. The two cases, in which the swimmer is located at
large distance, and in the proximity of a solid wall, are taken into account.
It is shown that migration can be achieved by means of a combination of sailing
through the flow and swimming, where the swimming strokes are induced by the
external flow without need of internal energy sources or external drives. The
structural dynamics required for the swimmer to move in the desired direction
is discussed and two simple models, based respectively on the presence of an
elastic structure, and on an orientation dependent friction, to control the
deformations induced by the external flow, are analyzed. In all cases, the
deformation sequence is a generalization of the tank-treading motion regimes
observed in vesicles in shear flows. Analytic expressions for the migration
velocity as a function of the deformation pattern and amplitude are provided.
The effects of thermal fluctuations on propulsion have been discussed and the
possibility that noise be exploited to overcome the limitations imposed on the
microswimmer by the scallop theorem have been discussed.Comment: 14 pages, 5 figure
Recommendations for active correction of hypernatremia in volume-resuscitated shock or sepsis patients should be taken with a grain of salt: A systematic review
Background: Healthcare-acquired hypernatremia (serum sodium >145 mEq/dL) is common among critically ill and other
hospitalized patients and is usually treated with hypotonic fluid and/or diuretics to correct a “free water deficit.� However,
many hypernatremic patients are eu- or hypervolemic, and an evolving body of literature emphasizes the importance of
rapidly returning critically ill patients to a neutral fluid balance after resuscitation.
Objective: We searched for any randomized- or observational-controlled studies evaluating the impact of active interventions
intended to correct hypernatremia to eunatremia on any outcome in volume-resuscitated patients with shock and/or sepsis.
Data sources: We performed a systematic literature search with studies identified by searching MEDLINE, Embase,
Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, ClinicalTrials.gov, IndexCatalogue
of the Library of the Surgeon General’s Office, DARE (Database of Reviews of Effects), and CINAHL and scanning
reference lists of relevant articles with abstracts published in English.
Data synthesis: We found no randomized- or observational-controlled trials measuring the impact of active correction of
hypernatremia on any outcome in resuscitated patients.
Conclusion: Recommendations for active correction of hypernatremia in resuscitated patients with sepsis or shock are
unsupported by clinical research acceptable by modern evidence standards.ECU Open Access Publishing Support Fun
The Cross-Chain Configuration and a New Type of Phase Transformation in Solid Long Chain Acid Amides
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