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An arthropod community beyond the dry limit of plant life

Journal of Arid Land 2021年第6期13卷 629-638页

作者： benjamin davidson Elli GRONER Arava Institute for Environmental Studies D.N.Eilot 88840Israel Vassar College PoughkeepsieNew York 12604United States of America Dead Sea and Arava Science Center Mitzpe Ramon 8060000Israel Ben Gurion University Eilat 88556Israel

Water availability,which enables plant growth and animal activity,regulates dryland ecosystem *** hyper-arid ecosystems,rain cannot support vascular plant ***,hyper-arid vegetation is restricted to the lower topography,where runoff ***,food resources originating from areas of dense vegetation are dispersed across the desert floor,enabling animal life in areas lacking vascular plant ***,certain regions,such as the hyper-arid upper topography,may be devoid of plant-derived food *** present study examined arthropod activity in the upper topography of a hyper-arid desert,in comparison with arthropod activity in the lower *** traps were utilized to compare arthropod activity along unvegetated ridges with activity in parallel,vegetated ***,the study revealed dense arthropod communities in the barren upper *** collected in the upper topography represented 26%of total arthropod *** addition,the overlap between arthropod identity in the ridges and wadis(i.e.,riverbeds)was low,and certain arthropods were strongly affiliated with the *** upper topographic communities included high numbers of silverfish(Zygentoma:Lepismatidae),malachite beetles(Psiloderes),and predatory mites(Acari:Anystidae),and these arthropods were present at various life *** remains unclear how arthropod communities can persist in the unvegetated upper topography of the hyper-arid study *** results raise the possibility that other food sources,independent from vascular plants,may play a significant role in the life history of hyper-arid arthropods.

关键词： hyper-arid area spatial distribution topography silverfish Tenebrionidae desert

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Endothelin-1 activation in pediatric patients undergoing surgical coarctation of the aorta repair

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World Journal of Cardiology 2017年第12期9卷 822-829页

作者： benjamin Steven Frank Tracy T Urban Suhong Tong Courtney Cassidy Max B Mitchell Christopher S Nichols Jesse A davidson Division of Cardiology Department of PediatricsUniversity of Colorado DenverAuroraCO 80045United States Children’s Hospital Colorado Research Institute AuroraCO 80045United States Department of Biostatistics University of Colorado DenverAuroraCO 80045United States Department of Pediatric Cardiology Children’s Hospital ColoradoAuroraCO 80045United States Department of Surgery University of Colorado DenverAuroraCO 80045United States Department of Anesthesiology University of Colorado DenverAuroraCO 80045United States

AIM To determine endothelin-1(ET-1)concentration before and after surgical coarctectomy and evaluate its association with left ventricular geometric *** prospective,cohort study of 24 patients aged 2 d to 10years with coarctation of the aorta undergoing surgical repair.A sub-cohort of patients with age1 year had no change in ET-1 concentration before and after surgery(1.1 vs 1.4,NS).Pre-op,patients2 pg/m L preop demonstrated higher LVMI(65.7 g/m^(2.7) vs 38.5 g/m^(2.7),P=0.004)and a trend towards higher RWT(45%vs39%,P=0.07)prior to repair than those with lower ***-1 concentration is significantly variable in the perioperative period surrounding *** children and infants have different responses to surgical repair suggesting different mechanisms of activation.

关键词： Biomarkers Cardiac remodeling Pediatric Neonate Left ventricular hypertrophy

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Spatially and spectrally resolved orbital angular momentum interactions in plasmonic vortex generators

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Light(Science & Applications) 2019年第1期8卷 907-915页

作者： Jordan A.Hachtel Sang-Yeon Cho Roderick B.davidson II Matthew A.Feldman Matthew F.Chisholm Richard F.Haglund Juan Carlos Idrobo Sokrates T.Pantelides benjamin J.Lawrie Center for Nanophase Materials Science Oak Ridge National LaboratoryOak RidgeTN 37831USA Klipsch School of Electrical and Computer Engineering New Mexico State UniversityLas CrucesNM 88003USA Department of Physics and Astronomy Vanderbilt UniversityNashvilleTN 37235USA Quantum Information Science Group Oak Ridge National LaboratoryOak RidgeTN 37831USA Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Department of Electrical Engineering and Computer Science Vanderbilt University NashvilleNashvilleTN 37235USA Chemistry Division U.S.Naval Research LaboratoryWashingtonD.C.20375USA

Understanding the near-field electromagnetic interactions that produce optical orbital angular momentum(OAM)is crucial for integrating twisted light into ***,we examine the cathodoluminescence(CL)of plasmonic vortices carrying OAM generated in spiral *** nanospiral geometry defines a photonic local density of states that is sampled by the electron probe in a scanning transmission electron microscope(STEM),thus accessing the optical response of the plasmonic vortex with high spatial and spectral *** map the full spectral dispersion of the plasmonic vortex in spiral structures designed to yield increasing topological ***,we fabricate nested nanospirals and demonstrate that OAM from one nanospiral can be coupled to the nested nanospiral,resulting in enhanced luminescence in concentric spirals of like handedness with respect to concentric spirals of opposite *** results illustrate the potential for generating and coupling plasmonic vortices in chiral nanostructures for sensitive detection and manipulation of optical OAM.

关键词： momentum spectral angular

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