Study on the oxygen pressure alkaline leaching of gold with generated thiosulfate from sulfur oxidation

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.

Download Full-text

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

Download Full-text

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.

Download Full-text

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

Download Full-text

Water-Soluble Ions in Atmospheric Aerosol Measured in a Semi-Arid and Chemical-Industrialized City, Northwest China

Atmosphere ◽

10.3390/atmos12040456 ◽

2021 ◽

Vol 12 (4) ◽

pp. 456

Author(s):

Huimin Jiang ◽

Zhongqin Li ◽

Feiteng Wang ◽

Xi Zhou ◽

Fanglong Wang ◽

...

Keyword(s):

Sulfur Oxidation ◽

Northwest China ◽

Water Soluble ◽

Heterogeneous Reactions ◽

Anthropogenic Source ◽

Heating Period ◽

Qinghai Province ◽

Soluble Ions ◽

Water Soluble Ions ◽

Semi Arid

We investigated water-soluble ions (WSIs) of aerosol samples collected from 2016 to 2017 in Lanzhou, a typical semi-arid and chemical-industrialized city in Northwest China. WSIs concentration was higher in the heating period (35.68 ± 19.17 μg/m3) and lower in the non-heating period (12.45 ± 4.21 μg/m3). NO3−, SO42−, NH4+ and Ca2+ were dominant WSIs. The concentration of SO42− has decreased in recent years, while the NO3− level was increasing. WSIs concentration was affected by meteorological factors. The sulfur oxidation and nitrogen oxidation ratios (SOR and NOR) exceeded 0.1, inferring the vital contribution of secondary transformation. Meanwhile higher O3 concentration and temperature promoted the homogeneous reaction of SO2. Lower temperature and high relative humidity (RH) were more suitable for heterogeneous reactions of NO2. Three-phase cluster analysis illustrated that the anthropogenic source ions and natural source ions were dominant WSIs during the heating and non-heating periods, respectively. The backward trajectory analysis and the potential source contribution function model indicated that Lanzhou was strongly influenced by the Hexi Corridor, northeastern Qinghai–Tibetan Plateau, northern Qinghai province, Inner Mongolia Plateau and its surrounding cities. This research will improve our understanding of the air quality and pollutant sources in the industrial environment.

Download Full-text

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.

Download Full-text