Microstructure and AC-Susceptibility of (Y,Ca)Ba2Cu4O8 Superconductors Prepared at Low (3 atm) and High (400 atm) Oxygen Pressure

Abstract. Summary: Background: We aimed at estimating the agreement between the Medicap® (photo-optical) and Radiometer® (electro-chemical) sensors during exercise transcutaneous oxygen pressure (tcpO2) tests. Our hypothesis was that although absolute starting values (tcpO2rest: mean over 2 minutes) might be different, tcpO2-changes over time and the minimal value of the decrease from rest of oxygen pressure (DROPmin) results at exercise shall be concordant between the two systems. Patients and methods: Forty seven patients with arterial claudication (65 + / - 7 years) performed a treadmill test with 5 probes each of the electro-chemical and photo-optical devices simultaneously, one of each system on the chest, on each buttock and on each calf. Results: Seventeen Medicap® probes disconnected during the tests. tcpO2rest and DROPmin values were higher with Medicap® than with Radiometer®, by 13.7 + / - 17.1 mm Hg and 3.4 + / - 11.7 mm Hg, respectively. Despite the differences in absolute starting values, changes over time were similar between the two systems. The concordance between the two systems was approximately 70 % for classification of test results from DROPmin. Conclusions: Photo-optical sensors are promising alternatives to electro-chemical sensors for exercise oximetry, provided that miniaturisation and weight reduction of the new sensors are possible.

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Adaptive control of arterial oxygen pressure of newborn infants under incubator oxygen treatments

IEE Proceedings D Control Theory and Applications ◽

10.1049/ip-d.1985.0036 ◽

1985 ◽

Vol 132 (5) ◽

pp. 205 ◽

Cited By ~ 26

Author(s):

A. Sano ◽

M. Kikucki

Keyword(s):

Adaptive Control ◽

Oxygen Pressure ◽

Newborn Infants ◽

Arterial Oxygen

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Interaction of human hemoglobin with oxygen in the presence of benzene and use of computer for construction of saturation curves

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19861795 ◽

1986 ◽

Vol 51 (8) ◽

pp. 1795-1801

Author(s):

Hana Hájková ◽

Zdeněk Pavlíček ◽

Vítěz Kalous

Keyword(s):

Oxygen Saturation ◽

Oxygen Pressure ◽

Time Profile ◽

Partial Oxygen Pressure ◽

Human Hemoglobin ◽

Allosteric Interaction ◽

Partial Oxygen

The time profile of changes in the oxygen saturation curves of human hemoglobin in the presence of benzene was investigated. The partial oxygen pressure p50, necessary for a half saturation, decreases during the first 3.5 h of interaction of hemoglobin with benzene and did not change afterwards. The character of changes in Hill's coefficient was similar. The oxygen saturation was modeled both for hemoglobin alone and, using MWC as a model of allosteric interaction, also for hemoglobin and benzene in a computer.

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RELATION OF OXYGEN PRESSURE AND TEMPERATURE TO GROWTH AND CARBON-DIOXIDE PRODUCTION IN THE FUNGUS POLYSTICTUS VERSICOLOR

American Journal of Botany ◽

10.1002/j.1537-2197.1937.tb09076.x ◽

1937 ◽

Vol 24 (3) ◽

pp. 109-119 ◽

Cited By ~ 12

Author(s):

T. C. Scheffer ◽

B. E. Livingston

Keyword(s):

Carbon Dioxide ◽

Oxygen Pressure ◽

Carbon Dioxide Production

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Frequency response of AC susceptibility in high temperature superconductors

Solid State Communications ◽

10.1016/j.ssc.2005.03.069 ◽

2005 ◽

Vol 135 (3) ◽

pp. 203-207 ◽

Cited By ~ 12

Author(s):

S.L. Liu ◽

G.J. Wu ◽

X.B. Xu ◽

J. Wu ◽

H.M. Shao ◽

...

Keyword(s):

High Temperature ◽

Frequency Response ◽

Ac Susceptibility ◽

High Temperature Superconductors

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Mismatch between Tissue Partial Oxygen Pressure and Near-Infrared Spectroscopy Neuromonitoring of Tissue Respiration in Acute Brain Trauma: The Rationale for Implementing a Multimodal Monitoring Strategy

International Journal of Molecular Sciences ◽

10.3390/ijms22031122 ◽

2021 ◽

Vol 22 (3) ◽

pp. 1122

Author(s):

Mario Forcione ◽

Mario Ganau ◽

Lara Prisco ◽

Antonio Maria Chiarelli ◽

Andrea Bellelli ◽

...

Keyword(s):

Infrared Spectroscopy ◽

Near Infrared Spectroscopy ◽

Oxygen Pressure ◽

Near Infrared ◽

Optical Signal ◽

Brain Trauma ◽

Partial Oxygen Pressure ◽

Tissue Respiration ◽

The Brain ◽

Partial Oxygen

The brain tissue partial oxygen pressure (PbtO2) and near-infrared spectroscopy (NIRS) neuromonitoring are frequently compared in the management of acute moderate and severe traumatic brain injury patients; however, the relationship between their respective output parameters flows from the complex pathogenesis of tissue respiration after brain trauma. NIRS neuromonitoring overcomes certain limitations related to the heterogeneity of the pathology across the brain that cannot be adequately addressed by local-sample invasive neuromonitoring (e.g., PbtO2 neuromonitoring, microdialysis), and it allows clinicians to assess parameters that cannot otherwise be scanned. The anatomical co-registration of an NIRS signal with axial imaging (e.g., computerized tomography scan) enhances the optical signal, which can be changed by the anatomy of the lesions and the significance of the radiological assessment. These arguments led us to conclude that rather than aiming to substitute PbtO2 with tissue saturation, multiple types of NIRS should be included via multimodal systemic- and neuro-monitoring, whose values then are incorporated into biosignatures linked to patient status and prognosis. Discussion on the abnormalities in tissue respiration due to brain trauma and how they affect the PbtO2 and NIRS neuromonitoring is given.

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New Radical Cation Salts Based on BDH-TTP Donor: Two Stable Molecular Metals with a Magnetic [ReF6]2− Anion and a Semiconductor with a [ReO4]− Anion

Magnetochemistry ◽

10.3390/magnetochemistry7040054 ◽

2021 ◽

Vol 7 (4) ◽

pp. 54

Author(s):

Nataliya D. Kushch ◽

Gennady V. Shilov ◽

Lev I. Buravov ◽

Eduard B. Yagubskii ◽

Vladimir N. Zverev ◽

...

Keyword(s):

Radical Cation ◽

Low Temperatures ◽

Ac Susceptibility ◽

Slow Relaxation ◽

Organic Radical ◽

Inorganic Anion ◽

Distinctive Features ◽

Metallic Character ◽

Radical Cation Salts ◽

Partial Population

Three radical cation salts of BDH-TTP with the paramagnetic [ReF6]2− and diamagnetic [ReO4]− anions have been synthesized: κ-(BDH-TTP)4ReF6 (1), κ-(BDH-TTP)4ReF6·4.8H2O (2) and pseudo-κ″-(BDH-TTP)3(ReO4)2 (3). The crystal and band structures, as well as the conducting properties of the salts, have been studied. The structures of the three salts are layered and characterized by alternating κ-(1, 2) and κ″-(3) type organic radical cation layers with inorganic anion sheets. Similar to other κ-salts, the conducting layers in the crystals of 1 and 2 are formed by BDH-TTP dimers. The partial population of positions of Re atoms and disorder in the anionic layers of 1–3 are their distinctive features. Compounds 1 and 2 show the metallic character of conductivity down to low temperatures, while 3 is a semiconductor. The ac susceptibility of crystals 1 was investigated in order to test the possible slow relaxation of magnetization associated with the [ReF6]2− anion.

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