Dissociation of ethylenediaminetetraacetic acid and stability of copper(II) ethylenediaminetetraacetates in aqueous solutions of ammonium nitrate

The dissociation constants (K1 and K2) of the carboxy groups of ethylenediaminetetraacetic acid (H4L) and the dissociation constant (K5) of the protonated form H5L+ were determined by pH-metric titration in the pH range 1.3-4.5 at variable concentrations of ammonium nitrate (μ = 1.0-7.0) in an aqueous solution (I = 25 ± 0.05°C). The dissociation constants of the ammonium groups in H4L (K3 and K4) failed to be determined under the experimental conditions chosen. For KNO3 and NaClO4 (μ = 1.2), all K1-K5 constants were calculated. The complexation of H4L with copper(II) in the presence of the supporting electrolytes of the indicated concentrations was studied by spectrophotometry and pH-metric titration. In the strongly acidic region, the [CuH3L]+ species was found to form, in addition to the diprotonated and monoprotonated copper(II) complexonates. The equilibrium constants for the formation of the complexonates change nonmonotonically with increase in the concentration of ammonium nitrate. At comparable ionic strengths of the solutions created by KNO3 (μ = 1.2), NH4NO3 (μ = 1.0), and NaClO4 (μ = 1.2), the effect of NaClO4 is most pronounced: the equilibrium constants decrease by ∼2 units of logK for all the complexonates. The formation of the heteroligand complex [CuLNH3]2- in the aqueous solutions of ammonium nitrate (pH > 6) was established by the spectrophotometric method. © 1998 MAEe cyrillic signK Hayκa/Interperiodica Publishing

Assessment of a biogas-generating microbial community in a pilot-scale anaerobic reactor

In this work bacteria and methanogenic archaea utilizing agricultural wastes in a pilot-scale biogas reactor were examined using sequencing and terminal restriction fragment length polymorphism analysis. Based on the analyses of 16S rRNA genes, Clostridia represented the most diverse group in the digester. Of the Clostridia, unclassified Clostridiales and the members of the genera Anaerotruncus and Tissierella were detected at high abundances. The representatives of the bacterial phyla Bacteroidetes and Proteobacteria were also defined, but in minor proportions, and were assigned to non-dominant communities. Within the phylum Euryarchaeota, the members of the orders Methanosarcinales and Methanomicrobiales were found at high levels. Methanogenic archaea were analyzed using both 16S rRNA and mcrA genes. Actually good results were received using both approaches; however, the rRNA gene method missed the non-dominant order Methanobacteriales. © 2013 The Society for Biotechnology, Japan

Calcium-magnesium in food and in the alkalizing complex "Probalans"

The article deals the results of a survey of students on the knowledge and use of food products rich in Ca and Mg, as well as the neutralizing properties of the «Probalans» dietary supplement from the line «LR LAYFACT. Germany ”, containing in its composition calcium and magnesium.В работе приведены результаты анкетирования студентов по знанию и использованию продуктов питания, богатых Са и Мg, а также нейтрализующие свойства биологически активной добавки «Пробаланс» из линии «ЛР ЛАЙФТАКТ. Германия», содержащей в своём составе кальций и магний

Myocardial bridges of coronary arteries

This literature review focuses on terminology, prevalence, diagnostics, clinical course features, and treatment of coronary artery myocardial bridges (MB). Ischemia pathogenetic mechanisms, MB clinical role and non‑invasive diagnostics by intravascular ultrasound are emphasized. The author analyzes principal studies (3.4‑11‑year follow‑up) on life prognosis in patients with angina‑like clinics and MB

Assessment of a biogas-generating microbial community in a pilot-scale anaerobic reactor

In this work bacteria and methanogenic archaea utilizing agricultural wastes in a pilot-scale biogas reactor were examined using sequencing and terminal restriction fragment length polymorphism analysis. Based on the analyses of 16S rRNA genes, Clostridia represented the most diverse group in the digester. Of the Clostridia, unclassified Clostridiales and the members of the genera Anaerotruncus and Tissierella were detected at high abundances. The representatives of the bacterial phyla Bacteroidetes and Proteobacteria were also defined, but in minor proportions, and were assigned to non-dominant communities. Within the phylum Euryarchaeota, the members of the orders Methanosarcinales and Methanomicrobiales were found at high levels. Methanogenic archaea were analyzed using both 16S rRNA and mcrA genes. Actually good results were received using both approaches; however, the rRNA gene method missed the non-dominant order Methanobacteriales. © 2013 The Society for Biotechnology, Japan

Dissociation of ethylenediaminetetraacetic acid and stability of copper(II) ethylenediaminetetraacetates in aqueous solutions of ammonium nitrate

The dissociation constants (K1 and K2) of the carboxy groups of ethylenediaminetetraacetic acid (H4L) and the dissociation constant (K5) of the protonated form H5L+ were determined by pH-metric titration in the pH range 1.3-4.5 at variable concentrations of ammonium nitrate (μ = 1.0-7.0) in an aqueous solution (I = 25 ± 0.05°C). The dissociation constants of the ammonium groups in H4L (K3 and K4) failed to be determined under the experimental conditions chosen. For KNO3 and NaClO4 (μ = 1.2), all K1-K5 constants were calculated. The complexation of H4L with copper(II) in the presence of the supporting electrolytes of the indicated concentrations was studied by spectrophotometry and pH-metric titration. In the strongly acidic region, the [CuH3L]+ species was found to form, in addition to the diprotonated and monoprotonated copper(II) complexonates. The equilibrium constants for the formation of the complexonates change nonmonotonically with increase in the concentration of ammonium nitrate. At comparable ionic strengths of the solutions created by KNO3 (μ = 1.2), NH4NO3 (μ = 1.0), and NaClO4 (μ = 1.2), the effect of NaClO4 is most pronounced: the equilibrium constants decrease by ∼2 units of logK for all the complexonates. The formation of the heteroligand complex [CuLNH3]2- in the aqueous solutions of ammonium nitrate (pH > 6) was established by the spectrophotometric method. © 1998 MAEe cyrillic signK Hayκa/Interperiodica Publishing

Dissociation of ethylenediaminetetraacetic acid and stability of copper(II) ethylenediaminetetraacetates in aqueous solutions of ammonium nitrate

The dissociation constants (K1 and K2) of the carboxy groups of ethylenediaminetetraacetic acid (H4L) and the dissociation constant (K5) of the protonated form H5L+ were determined by pH-metric titration in the pH range 1.3-4.5 at variable concentrations of ammonium nitrate (μ = 1.0-7.0) in an aqueous solution (I = 25 ± 0.05°C). The dissociation constants of the ammonium groups in H4L (K3 and K4) failed to be determined under the experimental conditions chosen. For KNO3 and NaClO4 (μ = 1.2), all K1-K5 constants were calculated. The complexation of H4L with copper(II) in the presence of the supporting electrolytes of the indicated concentrations was studied by spectrophotometry and pH-metric titration. In the strongly acidic region, the [CuH3L]+ species was found to form, in addition to the diprotonated and monoprotonated copper(II) complexonates. The equilibrium constants for the formation of the complexonates change nonmonotonically with increase in the concentration of ammonium nitrate. At comparable ionic strengths of the solutions created by KNO3 (μ = 1.2), NH4NO3 (μ = 1.0), and NaClO4 (μ = 1.2), the effect of NaClO4 is most pronounced: the equilibrium constants decrease by ∼2 units of logK for all the complexonates. The formation of the heteroligand complex [CuLNH3]2- in the aqueous solutions of ammonium nitrate (pH > 6) was established by the spectrophotometric method. © 1998 MAEe cyrillic signK Hayκa/Interperiodica Publishing

Dissociation of ethylenediaminetetraacetic acid and stability of copper(II) ethylenediaminetetraacetates in aqueous solutions of ammonium nitrate

The dissociation constants (K1 and K2) of the carboxy groups of ethylenediaminetetraacetic acid (H4L) and the dissociation constant (K5) of the protonated form H5L+ were determined by pH-metric titration in the pH range 1.3-4.5 at variable concentrations of ammonium nitrate (μ = 1.0-7.0) in an aqueous solution (I = 25 ± 0.05°C). The dissociation constants of the ammonium groups in H4L (K3 and K4) failed to be determined under the experimental conditions chosen. For KNO3 and NaClO4 (μ = 1.2), all K1-K5 constants were calculated. The complexation of H4L with copper(II) in the presence of the supporting electrolytes of the indicated concentrations was studied by spectrophotometry and pH-metric titration. In the strongly acidic region, the [CuH3L]+ species was found to form, in addition to the diprotonated and monoprotonated copper(II) complexonates. The equilibrium constants for the formation of the complexonates change nonmonotonically with increase in the concentration of ammonium nitrate. At comparable ionic strengths of the solutions created by KNO3 (μ = 1.2), NH4NO3 (μ = 1.0), and NaClO4 (μ = 1.2), the effect of NaClO4 is most pronounced: the equilibrium constants decrease by ∼2 units of logK for all the complexonates. The formation of the heteroligand complex [CuLNH3]2- in the aqueous solutions of ammonium nitrate (pH > 6) was established by the spectrophotometric method. © 1998 MAEe cyrillic signK Hayκa/Interperiodica Publishing

Assessment of a biogas-generating microbial community in a pilot-scale anaerobic reactor

In this work bacteria and methanogenic archaea utilizing agricultural wastes in a pilot-scale biogas reactor were examined using sequencing and terminal restriction fragment length polymorphism analysis. Based on the analyses of 16S rRNA genes, Clostridia represented the most diverse group in the digester. Of the Clostridia, unclassified Clostridiales and the members of the genera Anaerotruncus and Tissierella were detected at high abundances. The representatives of the bacterial phyla Bacteroidetes and Proteobacteria were also defined, but in minor proportions, and were assigned to non-dominant communities. Within the phylum Euryarchaeota, the members of the orders Methanosarcinales and Methanomicrobiales were found at high levels. Methanogenic archaea were analyzed using both 16S rRNA and mcrA genes. Actually good results were received using both approaches; however, the rRNA gene method missed the non-dominant order Methanobacteriales. © 2013 The Society for Biotechnology, Japan

Assessment of a biogas-generating microbial community in a pilot-scale anaerobic reactor

In this work bacteria and methanogenic archaea utilizing agricultural wastes in a pilot-scale biogas reactor were examined using sequencing and terminal restriction fragment length polymorphism analysis. Based on the analyses of 16S rRNA genes, Clostridia represented the most diverse group in the digester. Of the Clostridia, unclassified Clostridiales and the members of the genera Anaerotruncus and Tissierella were detected at high abundances. The representatives of the bacterial phyla Bacteroidetes and Proteobacteria were also defined, but in minor proportions, and were assigned to non-dominant communities. Within the phylum Euryarchaeota, the members of the orders Methanosarcinales and Methanomicrobiales were found at high levels. Methanogenic archaea were analyzed using both 16S rRNA and mcrA genes. Actually good results were received using both approaches; however, the rRNA gene method missed the non-dominant order Methanobacteriales. © 2013 The Society for Biotechnology, Japan