22 research outputs found

    Study of adsorption of cadmium ions from solutions on natural and modifi ed diatomites

    Get PDF
    The search for new technologies for the purification of natural and waste water does not lose its relevance. Biologically, heavy metals are among the most dangerous pollutants. The highest toxicity among them has cadmium, causing serious environmental problems during technogenic pollution of the aquatic environment, and its extraction is an urgent task. The analysis of foreign studies on the extraction of cadmium ions is carried out. The adsorption of cadmium has been studied by many authors and described in many works on kaolin oxides / iron hydroxides, in contrast to siliceous rocks. In this work, the use of the sorption method is proposed for the purification of wastewater from ions of heavy metals. The aim was to study the sorption activity of diatomite in relation to cadmium ions. The studies have been carried out under static conditions. The processes of physicochemical modification of diatomite for the extraction of cadmium ions from aqueous solutions have been investigated. The influence of time and pH on the value of sorption has been studied. The optimal conditions for sorption extraction have been determined. Adsorption isotherms have been constructed, and quantitative characteristics of the values of adsorption of cadmium ions on the surface of modified sorbents have been obtained. The fundamental possibility of using diatomites for the purification of cadmium-containing wastewater has been assessed. Based on the data obtained, it can be concluded that acid activation does not promote adsorption (even negative adsorption is observed), which confirms the mobility of cadmium in the low pH region, it can be assumed that only an increase in alkalinity to the possibility of formation of hydroxocadmium (CdOH)+. Thermal, shows stable adsorption in relation to Cd+2, which suggests the possibility of using such activation of cadmium diatomite and other metals, that is, with complex pollution

    Редкий случай верхушечной формы гипертрофической кардиомиопатии с внутрижелудочковой обструкцией у ребенка

    Get PDF
    Hypertrophic cardiomyopathy is characterized by primary hypertrophy of myocardium without another cause such as arterial hypertension. We present a rare case of apical hypertrophic cardiomyopathy in 7-year-old girl with minimal nonspecific clinical manifestation (headache after loading). At planned examination typically ECG changes - pronounced repolarization changes and deep (about 10 mm) inverted T waves in precordial leads - were discovered. Transthoracic echocardiography detected local symmetric hypertrophy of left ventricular apex with reduced contractility of this area and intraventricular obstruction with pressure gradient between apical and middle parts of left ventricle 30 mm Hg. This findings were confirmed by ventriculograhy and myocardial scintigraphy. Cardiac magnetic resonance imaging determined marked fibrotic transformation of left ventricular apex. The features of this case are: the young age of the patient and combination of apical hypertrophy with intraventricular obstruction.Гипертрофическая кардиомиопатия характеризуется первичной гипертрофией миокарда при отсутствии других причин этого, в частности артериальной гипертензии. Представлен редкий случай верхушечной гипертрофической кардиомиопатии у девочки 7 лет с минимальными неспецифическими клиническими проявлениями (головные боли, провоцируемые нагрузками). При плановом обследовании были обнаружены типичные изменения на ЭКГ - выраженные нарушения реполяризации миокарда и глубокие (до 10 мм) отрицательные зубцы Т в грудных отведениях. Трансторакальная эхокардиография выявила локальную симметричную гипертрофию верхушечных отделов левого желудочка с нарушением их сократимости и внутрижелудочковую обструкцию с градиентом давления между верхушечным и средним отделами 30 мм рт.ст., что было подтверждено данными вентрикулографии и сцинтиграфии миокарда. МРТ сердца позволила установить наличие выраженной фиброзной трансформации верхушки левого желудочка. Особенностью данного случая являются детский возраст пациентки и сочетание верхушечной гипертрофии миокарда с внутрижелудочковой обструкцией

    La décision d'émigrer

    No full text
    La situation démographique d'une région compte certainement parmi les facteurs les plus déterminants de l'émigration. Quand ils expliquent les raisons de leur départ, les migrants évoquent ordinairement le manque de logement, d'éducation et de formation professionnelle, les bas salaires et l'absence de loisirs organisés. Mais, au-delà de ces motifs et sans avoir à première vue de liens avec eux, on trouve souvent des phénomènes démographiques tels que la non-conformité entre le rythme de la c..

    Applicability of the modified diatomite for treatment of wastewater containing heavy metals

    No full text
    The paper studies various modifications of diatomite, aiming at creating sorbents for wastewater purification from heavy metal ions. Diatomite of the Akhmatovskoe deposit of the Penza region was considered as a raw material. The processes of physical and chemical modification of diatomite were investigated. Adsorption isotherms were constructed, quantitative characteristics of adsorption of copper ions on the surface of modified sorbents were obtained. A chemical modification (acidic and alkaline) is proposed, which results in an increased adsorption capacity for heavy metal ions. The applicability of diatomite for the purification of highly concentrated wastewater containing heavy metals is shown

    Simulated Solar Microwave Radiation Blocks the Formation of Biofilms

    No full text
    The article presents the results of the experimental study that was devoted to determining the blocking influence of the solar microwave radiation on the process of biofilm formation in Gram-positive and Gram-negative microorganisms. The microwave generator that allows simulating microwave “splashes ” of the Sun in the frequency range (4.0- 4.3 GHz) with the controlled inten-sity of radiation (from 50 µW/sm2 to 500 µW/sm2) was used for conducting this research. It is found out that the simulated solar radiation of the microwave range blocks the formation of the extracellular matrix by the opportunistic microorganisms. The results of this study confirm the hypothesis of the evolutionary nature of the leading role of the microwave radiation of the Sun in the life processes of organisms. The technology of the exposure on the microorganisms that was used in the experiment opens up the real prospects for reducing the persistent potential of mi-croorganisms and improving the efficiency of the bacterial infections treatment

    Biodiversity of macrophyte communities and associated aquatic organisms in lakes of the Vologda Region (north-western Russia)

    No full text
    This paper provides current data on the biodiversity of boreal lakes of the Vologda Region (north-western Russia), including macrophytes (vascular plants and macroscopic algae) and macrophyte inhabitants (invertebrates and microalgae). The raw data, given in two datasets (Sampling event dataset and an Occurrence dataset) and presented in the form of GBIF-mediated data, were collected from 139 lakes (macrophytes between 2005 and 2021, macrophyte inhabitants between 2014 and 2020). The dataset contains materials on the diversity of vascular plants (Tracheophyta, 3225 occurrences; Bryophyta, 155; Marchantiophyta, 16), macro- and microalgae (Ochrophyta, 546 occurrences; Chlorophyta, 193; Charophyta, 153; Cyanobacteria, 139; Cryptophyta, 86; Myzozoa, 33; Euglenozoa, 27; Rhodophyta, 8; Bigyra, 1) and aquatic invertebrates (Arthropoda, 1408 occurrences; Annelida, 487; Mollusca, 263; Platyhelminthes, 36; Cnidaria, 11). This paper summarises previously unpublished materials in a standardised form.The paper summarises the data collected during the long-term phytodiversity studies in a series of lakes of different types (Vologda Region, north-western Russia). Data on algae and invertebrates diversity were obtained in 60 different plant communities of aquatic, semi-aquatic and coastal plants or their combinations. A total of 6787 occurrences were included in the dataset, published in the global biodiversity database (GBIF) for the first time. According to the GBIF taxonomic backbone, the dataset comprised 837 taxa, including 711 lower-rank taxa (species, subspecies, varieties, forms). New records of 47 species rare and protected in the Vologda Region are given: 43 species of plants, three species of animals and one species of Cyanobacteria

    Spring fires 2020 in Russia: Results from participatory burned area mapping with Sentinel-2 imagery

    No full text
    The dataset contains information about all fires that occurred on the territory of the Russian Federation from January 1 to May 15, 2020, when the first peak of spring fires ends for most regions. The contours of the fires were obtained by visual interpretation of Sentinel-2 MSI medium resolution satellite images (10-20 m / pixel) in a combination of Infra-Red (11-8-2) and Natural Color (4-3-2) channels at a scale of 1: 10,000 to 1: 50,000. For a more accurate determination of the boundaries of the territories covered by the fire, the images before and after the fire were compared during visual interpretations. FIRMS thermal anomalies were used as an additional source of information. The digitizing process was carried out by trained volunteers, the verification was done by the GIS Unit experts of the Greenpeace Russia and contracted GIS specialists

    Colchicine in patients with heart failure and preserved left ventricular ejection fraction: rationale and design of a prospective, randomised, open-label, crossover clinical trial

    No full text
    Introduction Systemic low-grade inflammation is a fundamental pathophysiological mechanism of heart failure with preserved left ventricular ejection fraction (HFpEF). The efficacy of anti-inflammatory therapy in HFpEF is largely understudied. The aim of the study is to assess the anti-inflammatory effect of colchicine in HFpEF by looking at inflammatory biomarkers: high-sensitivity C reactive protein (hsCRP) and soluble suppression of tumorigenicity 2 (sST2).Methods and analysis This is a single-centre, prospective, randomised controlled, open-label, blinded-endpoint crossover clinical trial of stable but symptomatic patients with HFpEF. Patients will be randomised to either colchicine treatment 0.5 mg two times per day or usual care for 12 weeks followed by a 2-week washout period and crossover to 12 weeks of treatment with the alternate therapy. The primary objective is to investigate if administration of colchicine compared with usual care reduces inflammation in patients with HFpEF measured by primary endpoint sST2 and co-primary endpoint hsCRP at baseline and 12-week follow-up. Secondary objective is to determine if treatment with colchicine influences N-terminal pro-B-type natriuretic peptide levels, left ventricular diastolic function and remodelling, right ventricular systolic function and left atrial volumetric characteristics. We are aiming to enrol a total of 40 participants. This trial will answer the question if colchicine treatment reduces systemic low-grade inflammation and influences left ventricular diastolic function and remodelling with patients with HFpEF.Ethics and dissemination Ethical approval was obtained from the Ethics Committee of Sechenov University (reference: 03-22).Trial registration number NCT05637398
    corecore