Oxygen-Induced Dimerization of Alkyl-Manganese(II) 2,6-Bisiminopyridine Complexes: Selective Synthesis of a New Ditopic NNN-Pincer Ligand

The outcome of the reaction of manganese(II) dialkyls with 2,6-bisiminopyridine (BIP) ligands is dramatically altered by the presence of very small amounts of oxygen (< 0.5 mol %), leading to binuclear species. These arise from the dimerization of the initial product, a Mn(II) 4-alkyl-2,6-bisiminodihydropyridinate alkyl complex. Cleavage of the binuclear Mn products with methanol affords the free dimeric bases, which can be regarded as a special type of ditopic NNN pincer ligand with an unusual tricyclic framework. The coordinative ability of the new ligands has been probed with the syntheses of Zn and Pd organometallic derivativesMinisterio de Economía e Innovación TQ2015- 68978-

Oxygen Hyperbaric Exposure Induces GLUT4 Expression Reduction and No Folliculogenesis Alterations in Rat PCOS with Insulin Resistance Model

Objectives: To know effect of hyperbaric oxygen therapy to GLUT4 expression and folliculogenesis in rat PCOS with insulin resistent model.Materials and Methods: this is an analytic experimental study used 30 rats induced by testosterone propionate injection 1 mg/100 g body weight daily for 28 consecutive days as a PCOS with insulin resistent model. Animal models divided into 3 groups. Negative control was not given treatment, positive control was given placebo. Treatment group was given hyperbaric oxygen 2.4 ATA 90 minutes 2x5 days. GLUT4 expression determined by immunohystochemistry to m. Gastrocnemius. Hematoxylin Eosin staining to rat ovaries were performed to know differentiation in folliculogenesis. The results were then compared.Results: There were significant decrease of GLUT4 expression in treatment group (mean0,84+0,47)compared to negative and positive control (mean3,96+3,16and3,36+2,17). There were no different folliculogenesis in these groups.Conclusion: Hyperbaric oxygen 2.4 ATA 90 minutes 2x5 days induce decrease of GLUT4 expression and no alterations in folliculogenesis in rat PCOS with insulin resistent model, therefore can not yet be used as alternative therapy in PCOS

Dissolved Oxygen and Apparent Oxygen Utilization in Lembeh Strait Waters, North Sulawesi

Pengamatan kadar oksigen terlarut dan Apparent Oxygen Utilization (AOU) di Perairan Selat Lembeh dilaksanakan pada bulan Januari, Februari, Juni dan Juli 2016. Penelitian ini bertujuan untuk mengetahui kondisi oksigen terlarut dan Apparent Oxygen Utilization (AOU). Hasil analisa menunjukkan bahwa kadar oksigen terlarut di lapisan permukaan dan dekat dasar berkisar antara 6,00-6,56 mg/l dan 5,59-6,17 mg/l. Berdasarkan nilai suhu dan salinitas yang diperoleh dari penelitian ini telah dihitung daya larut, derajat kejenuhan oksigen dan nilai AOU pada lapisan permukaan. Di lapisan permukaan nilai AOU semuanya positip berkisar antara 0,10-0,72 mg/l dan di dekat dasar nilai AOU negatip dan positip berimbang, berkisar antara -0,23-0,42 mg/l. Konsentrasi oksigen terlarut di perairan Selat Lembeh belum menunjukkan dampak negatip terhadap lingkungan perairan dan masih sesuai dengan baku mutu air laut untuk biota laut

A Study of Magnetic Properties of Solid Oxygen, Oxygen-Argon and Oxygen-Fluorine

To acquire information on the interaction between oxygen molecules in solid phase, studies have been carried out on the magnetic properties of solid oxygen, oxygen-argon and oxygen-fluorine. Review of the studies on the interaction between oxygen molecules is cited. Magnetic susceptibility was measured by the Faraday method as a function of temperature from 12 K to the melting point of them. Pure oxygen both in α and β phase indicates paramagnetism corresponding to long-range antiferromagnetic order. Oxygen -argon mixtures of 92~66 mol% oxygen content indicate large susceptibility corresponding to δ phase, which can be interpreted in terms of the cluster of oxygen molecules in trimer. Small paramagnetism was found for the oxygenfluorine mixture even as dilute as 10 mol% oxygen content, which may be due to the strong antiferromagnetic interaction. This can be interpreted in terms of super-exchange interaction between oxygen molecules via fluorine molecule

Oxygen prescription and administration at the Emergency Department and medical wards in Mater Dei Hospital

Aims: The aim of this study was to audit current practices on oxygen prescription in the Emergency Department (ED), and on accurate oxygen administration in the wards of Mater Dei Hospital. Method: Two hundred and forty eight adult patients attending the ED with diagnoses most likely to require oxygen therapy (mainly cardio-respiratory conditions) were randomly selected during 5 winter weeks. Data were collected on oxygen saturation, arterial blood gases, oxygen administration at the ED, oxygen prescription and its documentation, and oxygen administration in wards. The z-test was used to assess statistical significance of results and Fisher’s exact test was used to determine the effect of oxygen prescription documentation in treatment charts. Results: Oxygen treatment was indicated in 85 of the 248 patients. Of these, documented oxygen administration at the ED was only present in 23.5% (p<0.0001). Formal instructions on oxygen use were documented in 85.9% (p<0.0001), however in 51.8% of these there were incomplete details. Only 7.1% of patients in whom oxygen treatment was prescribed received oxygen therapy in the wards according to instructions (p<0.0001). It was also found that documenting oxygen prescription in treatment charts made no significant difference to the number of patients who actually received oxygen correctly in the ward. Conclusion: This study shows that there is need for better prescription, documentation and administration of oxygen in our hospital. Introduction of simple standardized oxygen charts may ensure that oxygen prescription and monitoring in the ED is carried out properly and that these instructions are then faithfully carried out in our wards.peer-reviewe

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Department of Energy Engineering (Battery Science and Technology)Aprotic electrolyte based lithium-oxygen batteries are of considerable interest due to its ultrahigh theoretical specific energy density (1675 mAh per gram of oxygen) against the present lithium-ion battery. In spite of the attractiveness of its high theoretical capacity, there is a number of drawbacks such as instability of electrochemical reaction of electrode and electrolytes. In order to overcome these parasitic reactions, significant efforts have been devoted to developing the key materials such as carbon-free air cathodes and high concentrated electrolytes. However, the CO2 evolution during the charging process and low ionic conductivity limit the ideal electrochemical reaction in aprotic electrolytes. In this thesis, we applied the molten electrolyte based on nitrate-based electrolyte (Li/Na/K/Cs/Ca-NO3). The molten electrolyte, which has a eutectic point of 65???, has the advantages of high stability and high-temperature operation, thereby preventing detrimental solvent byproducts in lithium-oxygen batteries. We examined the Oxygen Evolution Reaction (OER) and Oxygen Reduction Reaction (ORR) on operating temperature using in situ pressure drop and gas analyses, Differential Electrochemical Mass Spectrometry (DEMS). Our results demonstrated that the Li2O2, a discharge product, formed a stable hexagonal morphology in the lithium-oxygen battery upon discharge process by scanning electron microscopy and X-ray diffraction techniques. Also, it leads to improved oxygen mobility at high temperature since a molten salt was used as the electrolyte in lithium-oxygen batteries. In addition, we found that kinetics are improved with increasing operating temperature in molten salt electrolyte cells.ope

Oxygen chemisorption cryogenic refrigerator

The present invention relates to a chemisorption compressor cryogenic refrigerator which employs oxygen to provide cooling at 60 to 100 K. The invention includes dual vessels containing an oxygen absorbent material, alternately heated and cooled to provide a continuous flow of high pressure oxygen, multiple heat exchangers for precooling the oxygen, a Joule-Thomson expansion valve system for expanding the oxygen to partially liquefy it and a liquid oxygen pressure vessel. The primary novelty is that, while it was believed that once oxygen combined with an element or compound the reaction could not reverse to release gaseous oxygen, in this case oxygen will indeed react in a reversible fashion with certain materials and will do so at temperatures and pressures which make it practical for incorporation into a cryogenic refrigeration system

The Steady-State Transport of Oxygen through Hemoglobin Solutions

The steady-state transport of oxygen through hemoglobin solutions was studied to identify the mechanism of the diffusion augmentation observed at low oxygen tensions. A novel technique employing a platinum-silver oxygen electrode was developed to measure the effective diffusion coefficient of oxygen in steady-state transport. The measurements were made over a wider range of hemoglobin and oxygen concentrations than previously reported. Values of the Brownian motion diffusion coefficient of oxygen in hemoglobin solution were obtained as well as measurements of facilitated transport at low oxygen tensions. Transport rates up to ten times greater than ordinary diffusion rates were found. Predictions of oxygen flux were made assuming that the oxyhemoglobin transport coefficient was equal to the Brownian motion diffusivity which was measured in a separate set of experiments. The close correlation between prediction and experiment indicates that the diffusion of oxyhemoglobin is the mechanism by which steady-state oxygen transport is facilitated