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3. |
- Bravo, L, et al.
(författare)
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- 2021
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swepub:Mat__t
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4. |
- Tabiri, S, et al.
(författare)
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- 2021
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swepub:Mat__t
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5. |
- Glasbey, JC, et al.
(författare)
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- 2021
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swepub:Mat__t
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6. |
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7. |
- Schael, S., et al.
(författare)
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Electroweak measurements in electron positron collisions at W-boson-pair energies at LEP
- 2013
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Ingår i: Physics Reports. - : Elsevier BV. - 0370-1573 .- 1873-6270. ; 532:4, s. 119-244
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Forskningsöversikt (refereegranskat)abstract
- Electroweak measurements performed with data taken at the electron positron collider LEP at CERN from 1995 to 2000 are reported. The combined data set considered in this report corresponds to a total luminosity of about 3 fb(-1) collected by the four LEP experiments ALEPH, DELPHI, 13 and OPAL, at centre-of-mass energies ranging from 130 GeV to 209 GeV. Combining the published results of the four LEP experiments, the measurements include total and differential cross-sections in photon-pair, fermion-pair and four-fermion production, the latter resulting from both double-resonant WW and ZZ production as well as singly resonant production. Total and differential cross-sections are measured precisely, providing a stringent test of the Standard Model at centre-of-mass energies never explored before in electron positron collisions. Final-state interaction effects in four-fermion production, such as those arising from colour reconnection and Bose Einstein correlations between the two W decay systems arising in WW production, are searched for and upper limits on the strength of possible effects are obtained. The data are used to determine fundamental properties of the W boson and the electroweak theory. Among others, the mass and width of the W boson, m(w) and Gamma(w), the branching fraction of W decays to hadrons, B(W -> had), and the trilinear gauge-boson self-couplings g(1)(Z), K-gamma and lambda(gamma), are determined to be: m(w) = 80.376 +/- 0.033 GeV Gamma(w) = 2.195 +/- 0.083 GeV B(W -> had) = 67.41 +/- 0.27% g(1)(Z) = 0.984(-0.020)(+0.018) K-gamma - 0.982 +/- 0.042 lambda(gamma) = 0.022 +/- 0.019. (C) 2013 Elsevier B.V. All rights reserved.
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8. |
- Schael, S, et al.
(författare)
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Precision electroweak measurements on the Z resonance
- 2006
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Ingår i: Physics Reports. - : Elsevier BV. - 0370-1573 .- 1873-6270. ; 427:5-6, s. 257-454
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Forskningsöversikt (refereegranskat)abstract
- We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLID experiment using a polarised beam at SLC. The measurements include cross-sections, forward-backward asymmetries and polarised asymmetries. The mass and width of the Z boson, m(Z) and Gamma(Z), and its couplings to fermions, for example the p parameter and the effective electroweak mixing angle for leptons, are precisely measured: m(Z) = 91.1875 +/- 0.0021 GeV, Gamma(Z) = 2.4952 +/- 0.0023 GeV, rho(l) = 1.0050 +/- 0.0010, sin(2)theta(eff)(lept) = 0.23153 +/- 0.00016. The number of light neutrino species is determined to be 2.9840 +/- 0.0082, in agreement with the three observed generations of fundamental fermions. The results are compared to the predictions of the Standard Model (SM). At the Z-pole, electroweak radiative corrections beyond the running of the QED and QCD coupling constants are observed with a significance of five standard deviations, and in agreement with the Standard Model. Of the many Z-pole measurements, the forward-backward asymmetry in b-quark production shows the largest difference with respect to its SM expectation, at the level of 2.8 standard deviations. Through radiative corrections evaluated in the framework of the Standard Model, the Z-pole data are also used to predict the mass of the top quark, m(t) = 173(+10)(+13) GeV, and the mass of the W boson, m(W) = 80.363 +/- 0.032 GeV. These indirect constraints are compared to the direct measurements, providing a stringent test of the SM. Using in addition the direct measurements of m(t) and m(W), the mass of the as yet unobserved SM Higgs boson is predicted with a relative uncertainty of about 50% and found to be less than 285 GeV at 95% confidence level. (c) 2006 Elsevier B.V. All rights reserved.
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9. |
- Khatri, C, et al.
(författare)
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Outcomes after perioperative SARS-CoV-2 infection in patients with proximal femoral fractures: an international cohort study
- 2021
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Ingår i: BMJ open. - : BMJ. - 2044-6055. ; 11:11, s. e050830-
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Tidskriftsartikel (refereegranskat)abstract
- Studies have demonstrated high rates of mortality in people with proximal femoral fracture and SARS-CoV-2, but there is limited published data on the factors that influence mortality for clinicians to make informed treatment decisions. This study aims to report the 30-day mortality associated with perioperative infection of patients undergoing surgery for proximal femoral fractures and to examine the factors that influence mortality in a multivariate analysis.SettingProspective, international, multicentre, observational cohort study.ParticipantsPatients undergoing any operation for a proximal femoral fracture from 1 February to 30 April 2020 and with perioperative SARS-CoV-2 infection (either 7 days prior or 30-day postoperative).Primary outcome30-day mortality. Multivariate modelling was performed to identify factors associated with 30-day mortality.ResultsThis study reports included 1063 patients from 174 hospitals in 19 countries. Overall 30-day mortality was 29.4% (313/1063). In an adjusted model, 30-day mortality was associated with male gender (OR 2.29, 95% CI 1.68 to 3.13, p<0.001), age >80 years (OR 1.60, 95% CI 1.1 to 2.31, p=0.013), preoperative diagnosis of dementia (OR 1.57, 95% CI 1.15 to 2.16, p=0.005), kidney disease (OR 1.73, 95% CI 1.18 to 2.55, p=0.005) and congestive heart failure (OR 1.62, 95% CI 1.06 to 2.48, p=0.025). Mortality at 30 days was lower in patients with a preoperative diagnosis of SARS-CoV-2 (OR 0.6, 95% CI 0.6 (0.42 to 0.85), p=0.004). There was no difference in mortality in patients with an increase to delay in surgery (p=0.220) or type of anaesthetic given (p=0.787).ConclusionsPatients undergoing surgery for a proximal femoral fracture with a perioperative infection of SARS-CoV-2 have a high rate of mortality. This study would support the need for providing these patients with individualised medical and anaesthetic care, including medical optimisation before theatre. Careful preoperative counselling is needed for those with a proximal femoral fracture and SARS-CoV-2, especially those in the highest risk groups.Trial registration numberNCT04323644
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12. |
- de Graauw, Th., et al.
(författare)
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The Herschel-Heterodyne Instrument for the Far-Infrared (HIFI)
- 2010
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 518, s. L6-
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Tidskriftsartikel (refereegranskat)abstract
- Aims: This paper describes the Heterodyne Instrument for the Far-Infrared (HIFI) that was launched onboard ESA's Herschel Space Observatory in May 2009. Methods: The instrument is a set of 7 heterodyne receivers that are electronically tuneable, covering 480-1250 GHz with SIS mixers and the 1410-1910 GHz range with hot electron bolometer (HEB) mixers. The local oscillator (LO) subsystem comprises a Ka-band synthesizer followed by 14 chains of frequency multipliers and 2 chains for each frequency band. A pair of auto-correlators and a pair of acousto-optical spectrometers process the two IF signals from the dual-polarization, single-pixel front-ends to provide instantaneous frequency coverage of 2 × 4 GHz, with a set of resolutions (125 kHz to 1 MHz) that are better than 0.1 km s-1. Results: After a successful qualification and a pre-launch TB/TV test program, the flight instrument is now in-orbit and completed successfully the commissioning and performance verification phase. The in-orbit performance of the receivers matches the pre-launch sensitivities. We also report on the in-orbit performance of the receivers and some first results of HIFI's operations. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
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13. |
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14. |
- Hill, JA, et al.
(författare)
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Medical Misinformation
- 2019
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Ingår i: Circulation. Cardiovascular interventions. - 1941-7632. ; 12:2, s. e007796-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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15. |
- Hill, JA, et al.
(författare)
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Medical Misinformation
- 2019
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Ingår i: Hypertension (Dallas, Tex. : 1979). - 1524-4563. ; 73:3, s. 506-507
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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16. |
- Hill, JA, et al.
(författare)
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Medical Misinformation
- 2019
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Ingår i: Circulation. Heart failure. - 1941-3297. ; 12:2, s. e005869-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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17. |
- Hill, JA, et al.
(författare)
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Medical Misinformation
- 2019
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Ingår i: Circulation. Cardiovascular imaging. - 1942-0080. ; 12:2, s. e008809-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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18. |
- Hill, JA, et al.
(författare)
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Medical Misinformation
- 2019
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Ingår i: Circulation. Genomic and precision medicine. - 2574-8300. ; 12:2, s. e002439-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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19. |
- Hill, JA, et al.
(författare)
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Medical Misinformation
- 2019
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Ingår i: Circulation. - 1524-4539. ; 139:5, s. 571-572
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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20. |
- Hill, JA, et al.
(författare)
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Medical Misinformation
- 2019
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Ingår i: Circulation. Cardiovascular quality and outcomes. - 1941-7705. ; 12:2, s. e005496-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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21. |
- Hill, JA, et al.
(författare)
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Medical misinformation: vet the message!
- 2019
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Ingår i: Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing. - : Springer Science and Business Media LLC. - 1572-8595. ; 55:1, s. 1-3
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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22. |
- Hill, JA, et al.
(författare)
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Medical misinformation: Vet the message!
- 2019
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Ingår i: Journal of electrocardiology. - : Elsevier BV. - 1532-8430 .- 0022-0736. ; 53, s. 112-113
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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23. |
- Hill, JA, et al.
(författare)
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Medical misinformation: vet the message!
- 2019
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Ingår i: Cardiovascular research. - : Oxford University Press (OUP). - 1755-3245 .- 0008-6363.
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Tidskriftsartikel (refereegranskat)
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24. |
- Hill, JA, et al.
(författare)
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Medical Misinformation: Vet the Message!
- 2019
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Ingår i: Cardiovascular drugs and therapy. - : Springer Science and Business Media LLC. - 1573-7241 .- 0920-3206. ; 33:3, s. 275-276
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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25. |
- Hill, JA, et al.
(författare)
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Medical Misinformation: Vet the Message!
- 2019
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Ingår i: International journal of cardiology. - : Elsevier BV. - 1874-1754 .- 0167-5273. ; 277, s. 1-2
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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26. |
- Hill, JA, et al.
(författare)
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Medical Misinformation: Vet the Message!
- 2019
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Ingår i: Journal of the American Heart Association. - 2047-9980. ; 8:3, s. e011838-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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27. |
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28. |
- Hill, JA, et al.
(författare)
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Medical misinformation: vet the message!
- 2019
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Ingår i: European heart journal. Quality of care & clinical outcomes. - : Oxford University Press (OUP). - 2058-1742 .- 2058-5225. ; 5:2, s. 83-84
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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29. |
- Hill, JA, et al.
(författare)
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Medical misinformation: vet the message!
- 2019
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Ingår i: European heart journal. Cardiovascular pharmacotherapy. - : Oxford University Press (OUP). - 2055-6845 .- 2055-6837. ; 5:2, s. 62-63
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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30. |
- Hill, JA, et al.
(författare)
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Medical misinformation: Vet the message!
- 2019
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Ingår i: Heart rhythm. - : Elsevier BV. - 1556-3871 .- 1547-5271. ; 16:3, s. 332-333
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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31. |
- Hill, JA, et al.
(författare)
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Medical Misinformation: Vet the Message!
- 2019
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Ingår i: Journal of cardiovascular pharmacology. - 1533-4023. ; 73:2, s. 61-62
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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32. |
- Hill, JA, et al.
(författare)
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Medical misinformation: vet the message!
- 2019
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Ingår i: European journal of heart failure. - : Wiley. - 1879-0844 .- 1388-9842. ; 21:3, s. 264-265
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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33. |
- Hill, JA, et al.
(författare)
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Medical misinformation: vet the message!
- 2019
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Ingår i: Cardiovascular research. - : Oxford University Press (OUP). - 1755-3245 .- 0008-6363. ; 115:14, s. E187-E188
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Tidskriftsartikel (refereegranskat)
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34. |
- Kuppuswamy, G. P., et al.
(författare)
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NiOX Template-Grown Ni-MOF-Coated Carbon Paper Electrode Embedded Extended Gate Field Effect Transistor for Glucose Detection in Saliva : En Route toward the Noninvasive Diagnosis of Diabetes Mellitus
- 2023
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Ingår i: ACS Applied Electronic Materials. - : American Chemical Society. - 2637-6113. ; 5:6, s. 3268-
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Tidskriftsartikel (refereegranskat)abstract
- Our present work focuses on the development of nickel oxalate (NiOX) template-assisted growth of a nickel-metal organic framework (Ni-MOF) with sheetlike morphology on carbon paper (CP) electrode for the noninvasive detection of glucose. We have utilized an extended gate field effect transistor (EGFET) where the Ni-MOF/CP electrode serves as the extended gate of a commercial n-type metal oxide semiconductor FET for sensing glucose. The electrode detects glucose concentrations ranging from 20 μM to 1.47 mM. The sensor operates at a voltage of 0.7 V in the physiologically relevant electrolyte of phosphate-buffered saline (PBS) with a response time of less than 5 s. The sensitivity is calculated as 86 μA mM-1 cm-2 from the linear region of the sensor response to the glucose concentration (20 μM to 0.27 mM). Also, Ni-MOF/CP has shown a good selective response toward glucose against uric acid, sucrose, fructose, and ascorbic acid. Additionally, the glucose sensing mechanism is investigated through work function changes of the sensing electrode using a scanning Kelvin probe. Real-time sample testing has revealed that the sensor preserves the sensitivity in human saliva too. In summary, we conclude that the Ni-MOF/CP extended gate electrode EGFET is an alternative device for salivary glucose detection toward the noninvasive diagnosis of diabetes mellitus that can identify hyperglycemic, normal, and hypoglycemic conditions.
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35. |
- Randler, C., et al.
(författare)
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Animal welfare attitudes : Effects of gender and diet in university samples from 22 countries
- 2021
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Ingår i: Animals. - : MDPI AG. - 2076-2615. ; 11:7
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Tidskriftsartikel (refereegranskat)abstract
- Animal Welfare Attitudes (AWA) are defined as human attitudes towards the welfare of animals in different dimensions and settings. Demographic factors, such as age and gender are associated with AWA. The aim of this study was to assess gender differences among university students in a large convenience sample from twenty-two nations in AWA. A total of 7914 people participated in the study (5155 women, 2711 men, 48 diverse). Participants completed a questionnaire that collected demographic data, typical diet and responses to the Composite Respect for Animals Scale Short version (CRAS-S). In addition, we used a measure of gender empowerment from the Human Development Report. The largest variance in AWA was explained by diet, followed by country and gender. In terms of diet, 6385 participants reported to be omnivores, 296 as pescatarian, 637 ate a vegetarian diet and 434 were vegans (n = 162 without answer). Diet was related with CRAS-S scores; people with a vegan diet scored higher in AWA than omnivores. Women scored significantly higher on AWA than men. Furthermore, gender differences in AWA increased as gender inequality decreased. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
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36. |
- Roselli, Carolina, et al.
(författare)
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Multi-ethnic genome-wide association study for atrial fibrillation
- 2018
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Ingår i: Nature Genetics. - : Springer Science and Business Media LLC. - 1061-4036 .- 1546-1718. ; 50:9, s. 1225-1233
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Tidskriftsartikel (refereegranskat)abstract
- Atrial fibrillation (AF) affects more than 33 million individuals worldwide(1) and has a complex heritability(2). We conducted the largest meta-analysis of genome-wide association studies (GWAS) for AF to date, consisting of more than half a million individuals, including 65,446 with AF. In total, we identified 97 loci significantly associated with AF, including 67 that were novel in a combined-ancestry analysis, and 3 that were novel in a European-specific analysis. We sought to identify AF-associated genes at the GWAS loci by performing RNA-sequencing and expression quantitative trait locus analyses in 101 left atrial samples, the most relevant tissue for AF. We also performed transcriptome-wide analyses that identified 57 AF-associated genes, 42 of which overlap with GWAS loci. The identified loci implicate genes enriched within cardiac developmental, electrophysiological, contractile and structural pathways. These results extend our understanding of the biological pathways underlying AF and may facilitate the development of therapeutics for AF.
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37. |
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38. |
- Benetti, M., et al.
(författare)
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POLYSILICON MESOSCOPIC WIRES COATED BY Pd AS H(2) SENSORS
- 2009
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Ingår i: PROCEEDINGS OF THE 13TH ITALIAN CONFERENCE ON SENSORS AND MICROSYSTEMS. - SINGAPORE : WORLD SCIENTIFIC PUBL CO PTE LTD. ; , s. 161-165
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Konferensbidrag (refereegranskat)abstract
- In this work a novel monocrystalline silicon nanowires array has been investigated and presented as hydrogen sensor, designed and fabricated by employing high resolution microfabrication techniques and featuring a high surface/volume ratio. The nanowires arrays makes up the channel of a MOS system, palladium-silicon dioxide-silicon. Several devices have been fabricated by using a SOI (Silicon On Insulator) substrate, Source and Drain have been geometrically patterned by optical lithography and Boron p-doped. Electron Beam Litography (EBL) defined the MOS channel made up of a nanowires array of different length and width in different transistors. The pads of Source and Drain have been manufactured with an aluminium film deposition. The Gate has been fabricated with a grown silicon oxide layer (17.4 nm) and Palladium has been used as gate contact. Polarizing and exposing the device to H(2)/N(2) cycles at different concentrations some preliminary measurements have been successfully conducted.
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39. |
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40. |
- Diaz, Ben P., et al.
(författare)
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Seasonal mixed layer depth shapes phytoplankton physiology, viral production, and accumulation in the North Atlantic
- 2021
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Ingår i: Nature Communications. - : Nature Publishing Group. - 2041-1723. ; 12:1
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Tidskriftsartikel (refereegranskat)abstract
- Seasonal shifts in phytoplankton accumulation and loss largely follow changes in mixed layer depth, but the impact of mixed layer depth on cell physiology remains unexplored. Here, we investigate the physiological state of phytoplankton populations associated with distinct bloom phases and mixing regimes in the North Atlantic. Stratification and deep mixing alter community physiology and viral production, effectively shaping accumulation rates. Communities in relatively deep, early-spring mixed layers are characterized by low levels of stress and high accumulation rates, while those in the recently shallowed mixed layers in late-spring have high levels of oxidative stress. Prolonged stratification into early autumn manifests in negative accumulation rates, along with pronounced signatures of compromised membranes, death-related protease activity, virus production, nutrient drawdown, and lipid markers indicative of nutrient stress. Positive accumulation renews during mixed layer deepening with transition into winter, concomitant with enhanced nutrient supply and lessened viral pressure. Phytoplankton are important primary producers. Here the authors investigate phytoplankton physiological changes associated with bloom phases and mixing regimes in the North Atlantic, finding that stratification and deep mixing shape accumulation rates by altering physiology and viral production.
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41. |
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42. |
- Grilli, Simonetta, et al.
(författare)
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A Mach-Zehnder interferometric system for measuring the refractive indices of uniaxial crystals
- 2002
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Ingår i: Optics communications. - 0030-4018. ; 202, s. 9-15
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Tidskriftsartikel (refereegranskat)abstract
- We report a new interferometric technique for measuring the ordinary and extraordinary refractive indices of uniaxial crystals. The technique is based on the measurement of the rotation-dependent phase changes of the optical path length in crystal plates. Accurate measurement of the phase shift as a function of the rotation of the sample is achieved by using a fast-Fourier-transform based fringe analysis method for phase retrieval. The principle of the method is discussed and measurements of the ordinary and extraordinary refractive indices of a lithium niobate crystal are reported.
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43. |
- Grilli, Simonetta, et al.
(författare)
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Double-face and submicron two-dimensional domain patterning in congruent lithium niobate
- 2006
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Ingår i: IEEE photonics technology letters. - 1041-1135. ; 18, s. 541-
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Tidskriftsartikel (refereegranskat)abstract
- We report on the simultaneous fabrication of two-dimensional submicron engineered domain patterns on both crystal faces, in congruent lithium niobate. The fabrication technique is based on interference photolithography, which allows short pitch over large areas, followed by electric field poling performed in overpoling regime. Experimental results for different domain pattern geometries, on the two crystal faces, are reported. These structures could be useful for short-wavelength frequency conversion and Bragg gratings applications. The moire effect is used in the lithographic process to fabricate more complex structures which could find application in photonic bandgap devices.
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44. |
- Grilli, Simonetta, et al.
(författare)
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Investigation on reversed domain structures in lithium niobate crystals patterned by interference lithography
- 2003
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Ingår i: Optics express. - 1094-4087. ; 11, s. 392-
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate fabrication of periodically poled lithium niobate samples by electric field poling, after patterning by interference lithography. Furthermore we investigate the poling process at an overpoling regime which caused the appearance of submicron dot domains very similar to those induced by backswitch but different in nature. We show the possibility for realizing submicron-scaled three-dimensional domain patterns that could be applied to the construction of photonic crystals and in nonlinear optics. We show that high etch-rate applied to such structures allows to obtain pyramidal-like submicron relief structures which in principle could find application for waveguide construction in photonic bandgap devices
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45. |
- Grilli, Simonetta, et al.
(författare)
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Two-dimensional mapping of electro-optic phase retardation in lithium niobate crystals by digital holography
- 2005
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Ingår i: Optics letters. - 0146-9592. ; 30:13, s. 1671-1673
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate accurate two-dimensional mapping of the phase retardation induced by the electro-optic effect in lithium niobate crystals. Off-axis digital holography is used to investigate congruent z-cut crystals. The spatially resolved optical path difference is interferometrically measured while a linearly rising voltage ramp is applied to the crystal. This procedure provides information on the uniformity of crystals' electro-optic properties and offers the ability to detect the presence of defects that is of fundamental importance for reliable processing of photonic devices.
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46. |
- Grilli, Simonetta, et al.
(författare)
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Visualization of optical deflection and switching operations by a domain-engineered-based LiNbO electro-optic device
- 2003
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Ingår i: Optics express. - 1094-4087. ; 11, s. 1212-
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Tidskriftsartikel (refereegranskat)abstract
- An electro-optic device applied as an optical beam deflector and switch at different wavelengths has been built and tested. The electro-optic device is based on domain-engineered lithium niobate (LiNbO3). In this paper, for the first time, its operation has been visualized by an imaging camera. The device has been characterized both at the visible wavelength (632.8 nm) and at a typical telecom wavelength (1532 nm). Furthermore, the device has been tested as an amplitude modulator in the mid-infrared region as well, at a wavelength of similar to4.3 mum, where no Pockels cells are available. A detailed description of this device is given, and the experimental results are discussed.
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47. |
- Paturzo, M., et al.
(författare)
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Investigation of electric internal field in congruent LiNbO3 by electro-optic effect
- 2004
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Ingår i: Applied physics letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 85, s. 5652-5654
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Tidskriftsartikel (refereegranskat)abstract
- We investigate the effect of the defect-induced internal field on the electro-optic behavior of z-cut congruent lithium niobate crystals. We measure, by a spatially resolved interferometric technique, the phase retardation due to an external applied voltage occurring in two regions with opposite ferroelectric polarization. When measurements are performed just after electrical poling, the two opposite domains show a different electro-optic behavior. We interpret this as due to an elastic component of the internal field. In fact, the asymmetric behavior disappears when the sample is thermally annealed, i.e., when the internal field vanishes
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48. |
- Paturzo, M., et al.
(författare)
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On the origin of internal field in lithium niobate crystals directly observed by digital holography
- 2005
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Ingår i: Optics express. - 1094-4087. ; 13:14, s. 5416-
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Tidskriftsartikel (refereegranskat)abstract
- We show the defect dependence of the internal field in Lithium Niobate using a full-field interferometric method and demonstrate that it can be directly measured on some clusters of defects embedded in a stoichiometric matrix. Results show that the value of the internal field grows in proximity of defects and vanishes far from them, which addresses the long-standing issue about its origin in Lithium Niobate crystal.
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