Postpartum haemorrhage: minimum allowable haemoglobin level

Despite defining the acceptable postpartum haemoglobin levels, there is neither consensus, nor a strong statistically proven analysis of its minimum safe level and its influence on systemic haemodynamic and oxygen metabolism in particular. The aim. Therefore, this study aimed to determine statistically minimal allowable haemoglobin levels in postpartum women in case of postpartum haemorrhage which allows the cardiac functional status and oxygen metabolism to be maintained on the lower margin of the physiological range. Materials and methods: Clinical research was on 113 postpartum women who had received blood transfusions for postpartum haemorrhages were selected for this study. The following circulation parameters were assessed: heart rate (HR), systolic blood pressure (BPs), diastolic blood pressure (BPD), mean arterial pressure (MAP), central venous pressure (CVP), cardiac index (СІ), contractility index (ΔS), systemic vascular resistance index (SVRI), systemic oxygen delivery index (IDО2), systemic oxygen consumption index (IVО2), tissue oxygen extraction ratio (O2ER). Results: Through a comparison of hemodynamic parameters depending on haematocrit and haemoglobin levels in patients with postpartum blood loss it was discovered that in case of blood loss and consequent intensive therapy aimed at TBV (total blood volume) restoration statistically significant changes of BPs, MAP, СІ and SVRI were observed. Also, during this study linear high-degree correlations between СІ, ΔS and Hb levels were found. Analysis of systemic oxygen transport dependence on haematocrit and haemoglobin levels for patients during the early postpartum period demonstrates significant differences in cardiac indexes with a strong positive statistically significant correlation between these parameters and haemoglobin levels. Conclusion. From the calculation of the minimum allowable haemoglobin level in postpartum women in case of blood loss using linear regression with coefficients calculated through the method of least squares the Hb=82.5 g/L value was obtained, which can be considered the minimum allowable level in postpartum women in case of postpartum blood loss which allows the cardiac functional status and oxygen metabolism to be on safety physiological rang

Calorimetric Study of Propane and Ethylbenzene on Active Surface on Carbon-Based Catalysts

The use of carbon materials instead of (mixed) metal oxides in selective oxidation catalysis could emerge to be of basic interest for the catalysis community. Low dimensional carbon allotropes such as multiwalled carbon nanotubes (CNTs) with high structural homogeneity provide the characteristics of model catalysts with well defined active sites as compared with polyvalent transition metal oxides featuring complex electronic and spin structures. The oxydehydrogenation (ODH) reaction over carbon has been discovered in 1979 by Alkhazov et al.[1] From the mechanistic point of view, quinone groups are believed be the active site. These nucleophilic oxygen species can selectively abstract hydrogen atoms and the formed phenol groups are subsequently reoxidized by O2. We choose the ODH of propane and ethylbenzene (EB) as the model reactions. Propane is widely investigated as a substrate in this reaction and mechanistic models for the reaction sequence over metal oxide catalysts are nu-merously suggested. It is equipped with a high C–H bond strength (410.5 kJ mol-1). In contrary to the alkane, the weak C-H bond in benzylic position (357.3 kJ mol-1) makes the molecule highly reactive for ODH

Spin catalysts: A quantum trigger for chemical reactions

Spin catalysis allows restrictions of the spin conservation rule to be overcome, and, moreover, provides a tool for fine control of elementary reactions. Spin-conductive solid catalysts make processes over surfaces strongly correlated and also can trigger the direction of the reaction via external magnetic field application. Activation/deactivation of O2 and non-polar small molecules, homolytic bond cleavage, and coupling of radicals are within the practical scope of spin catalysis

Quantum Chemical Simulation of Phenol-Formaldehyde Resin Carbonization in the Presence of Phosphoric Acid: Computational Evidence of Michaelis–Arbuzov-Type Reaction

Quantum-chemical semiempirical simulation of phenol-formaldehyde resin carbonization was performed by PM6 method, resulting in atomic level models of neat and P-doped disordered carbon structures. Mechanisms of curved-plane carbon fragments formation from postpolymeric chains is discussed, supported by change in statistic characteristics of the clusters. Transformation of phosphoric esters to phosphonates by Michaelis–Arbuzov-type reaction is described

Characterization by SEM, TEM and Quantum-Chemical Simulations of the Spherical Carbon with Nitrogen (SCN) Active Carbon Produced by Thermal Decomposition of Poly(vinylpyridine-divinylbenzene) Copolymer

Amorphous Spherical Carbon with Nitrogen (SCN) active carbon has been prepared by carbonization of poly(vinylpyridine-divinylbenzene) (PVPDVB) copolymer. The PVPDVB dehydrogenation copolymer has been quantum chemically (QC) simulated using cluster and periodic models. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray (EDX) studies of the resulting product have conformed the QC computation results. Great structural similarity is found both at the nano- and micro-levels between the N-doped SCN carbon and its pure carbonic SKS analog

Characterization by SEM, TEM and Quantum-Chemical Simulations of the Spherical Carbon with Nitrogen (SCN) Active Carbon Produced by Thermal Decomposition of Poly(vinylpyridine-divinylbenzene) Copolymer

Amorphous Spherical Carbon with Nitrogen (SCN) active carbon has been prepared by carbonization of poly(vinylpyridine-divinylbenzene) (PVPDVB) copolymer. The PVPDVB dehydrogenation copolymer has been quantum chemically (QC) simulated using cluster and periodic models. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray (EDX) studies of the resulting product have conformed the QC computation results. Great structural similarity is found both at the nano- and micro-levels between the N-doped SCN carbon and its pure carbonic SKS analog

Quantum Chemical Simulation of Phenol-Formaldehyde Resin Carbonization in the Presence of Phosphoric Acid: Computational Evidence of Michaelis–Arbuzov-Type Reaction

Quantum-chemical semiempirical simulation of phenol-formaldehyde resin carbonization was performed by PM6 method, resulting in atomic level models of neat and P-doped disordered carbon structures. Mechanisms of curved-plane carbon fragments formation from postpolymeric chains is discussed, supported by change in statistic characteristics of the clusters. Transformation of phosphoric esters to phosphonates by Michaelis–Arbuzov-type reaction is described

Quantum Chemical Simulation of Phenol-Formaldehyde Resin Carbonization in the Presence of Phosphoric Acid: Computational Evidence of Michaelis–Arbuzov-Type Reaction

Quantum-chemical semiempirical simulation of phenol-formaldehyde resin carbonization was performed by PM6 method, resulting in atomic level models of neat and P-doped disordered carbon structures. Mechanisms of curved-plane carbon fragments formation from postpolymeric chains is discussed, supported by change in statistic characteristics of the clusters. Transformation of phosphoric esters to phosphonates by Michaelis–Arbuzov-type reaction is described

jp7b00068_SI_D_C2H6.zip

This is a collection of protocols of QC calculations for the paper "Impact of Edge Oxidation State on Red-Ox Barriers during Hydrocarbon Oxydehydrogenation over Carbon Nanotube Catalysts: a Theoretical Study" by Oleksiy V. Khavryuchenko & Benjamin Frank, denited as SI_D in the Supplement.<div><br></div