Πολεοδομική αναμόρφωση περιοχής σταθμού μετρό Νίκαιας (Κοκκινιάς)

Εθνικό Μετσόβιο Πολυτεχνείο. Μεταπτυχιακή εργασία. Διεπιστημονικό - Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) "Αρχιτεκτονική - Σχεδιασμός του Χώρου : Πολεοδομία - Χωροταξία (Κατ. Β')

Myocardial damage after prolonged accidental hypothermia: a case report

<p>Abstract</p> <p>Introduction</p> <p>A case of cardiac toxicity due to prolonged hypothermia is reported.</p> <p>Case presentation</p> <p>A 42-year-old woman of Caucasian origin presented with hypothermia after an accident. She developed atrial fibrillation and heart failure with minor electrocardiographic changes, which mimicked ischaemia. She recovered completely after one month of treatment for heart failure.</p> <p>Conclusion</p> <p>Prolonged hypothermia, which mimicks ischaemia, may cause arrhythmias and heart failure.</p

Biofunctional Characteristics of Lignite Fly Ash Modified by Humates: A New Soil Conditioner

Fly ash superficially modified with humic substances from the Megalopolis lignitic power plant was prepared and evaluated for agricultural uses. UV-vis spectrophotometry and IR spectroscopy revealed that fly ash shows high sorption efficiency towards humic substances. Adsorption proceeds stepwise via strong Coulombic and hydrophophic forces of attraction between guest and host materials. Langmuir, Freundlich, BET, Harkins-Jura, and Dubinin-Radushkevich isotherm models were employed to evaluate the ongoing adsorption and shed light to the physicochemical properties of the sorbent-adsorbate system. Humic substances desorption and microbial cultivation experiments were also carried out to examine the regeneration of the humates under washing and explore the possibility of this material acclimatizing in real soil conditions, both useful for biofunctional agricultural applications

Penggunaan Media Pembelajaran di Masa Pandemi Covid-19 agar Hasil Belajar di SD Darut Tauhid Ar-Rafi Tetap Maksimal

The purpose of this study is to provide an overview of the online learning process during the pandemic at SD DAARUT TASBIH Ar RAFI, find out the various teaching media that can be used to be delivered in online teaching and learning activities (online). This study uses the method used in this study, namely the descriptive method with a qualitative approach with data collection techniques of observation, interviews and documentation in conducting the online learning process. Based on the research, various teaching media are used such as youtube, educational platforms such as whatsapp, google classroom , google meet, zoom cloud meeting, and others. Based on the results of the study, it can be concluded that the use of teaching media and educational platforms can be an alternative solution in learning, for the sake of continuity of learning in each education unit

Structurally Diverse Metal Coordination Compounds, Bearing Imidodiphosphinate and Diphosphinoamine Ligands, as Potential Inhibitors of the Platelet Activating Factor

Metal complexes bearing dichalcogenated imidodiphosphinate [R2P(E)NP(E)R2′]− ligands (E = O, S, Se, Te), which act as (E,E) chelates, exhibit a remarkable variety of three-dimensional structures. A series of such complexes, namely, square-planar [Cu{(OPPh2)(OPPh2)N-O, O}2], tetrahedral [Zn{(EPPh2)(EPPh2)N-E,E}2], E = O, S, and octahedral [Ga{(OPPh2)(OPPh2)N-O,O}3], were tested as potential inhibitors of either the platelet activating factor (PAF)- or thrombin-induced aggregation in both washed rabbit platelets and rabbit platelet rich plasma. For comparison, square-planar [Ni{(Ph2P)2N-S-CHMePh-P, P}X2], X = Cl, Br, the corresponding metal salts of all complexes and the (OPPh2)(OPPh2)NH ligand were also investigated. Ga(O,O)3 showed the highest anti-PAF activity but did not inhibit the thrombin-related pathway, whereas Zn(S,S)2, with also a significant PAF inhibitory effect, exhibited the highest thrombin-related inhibition. Zn(O,O)2 and Cu(O,O)2 inhibited moderately both PAF and thrombin, being more effective towards PAF. This work shows that the PAF-inhibitory action depends on the structure of the complexes studied, with the bulkier Ga(O,O)3 being the most efficient and selective inhibitor

Humic Substances: A Novel Eco-Friendly Fertilizer

Humic substances (HS) are macromolecular organic materials ubiquitous in both aquatic and terrestrial systems, effective electron shuttling compounds providing macro- and microelements in organochelate form, and play an important role in determining the mobility and bioavailability of organic/inorganic nutrients and mineral fertilizers [...

Humic Substances: Importance for Agriculture, Affinity and Interactions with Soil Amendments and Pollutants

Humic substances (HS) represent a key component in both aquatic and terrestrial ecosystems, constituting a major pool of recalcitrant organic carbon and nitrogen [...

Synthesis and characterization of novel chromium pillared clays

New chromium pillared clays of basal spacing 2.45 nm were synthesized and characterized. The chromium oligomers used for intercalation were prepared by quick addition of base and acid to Cr(III) monomeric solutions followed by reflux. The synthesized clays exhibit increased BET surface area and higher micropore volume compared to clays with lower galleries, pillared either by smaller Cr(III) oligomers or by Cr(III) monomers. Important parameters affecting the d0 0 1 basal spacing were studied, e.g. the pH of the pillaring solution, the intercalation time, the chromium concentration and the counter-anion present in the chromium solutions. Scanning electron micrographs were acquired to demonstrate changes of the clay texture before and after pillaring. The thermal behavior of the synthesized clays was also examined. © 2004 Elsevier B.V. All rights reserved

Clay-catalyzed phenomena of cationic-dye aggregation and hydroxo-chromium oligomerization

Higher dye aggregates, organized in layers, were catalytically obtained by intercalating C.I. Basic Blue 41 into montmorillonite and bentonite at very high dye:clay ratios, i.e., larger than 200% of the cation exchange capacity (CEC). Further oligomerization of the chromium oligomers, inserted into montmorillonite intercalated with hydroxo-chromium complexes, was also recognized as clay-promoted. Formation of higher agglomerates proceeding through interactions with the host aluminosilicate suggests that the clays act as aggregation catalysts equally with organic and inorganic compounds. Scanning electron microscopy (SEM) was employed to examine the microstructure of the hybrid materials constructed; both high-order assemblies of the monoazo-cationic dye and higher Cr(III) oligomers characteristically modify the surface morphology of the intercalated clays. © 2009 Elsevier Inc. All rights reserved

Sorption characterization of a cationic dye retained by clays and perlite

The adsorption of C.I. Basic Blue 41 onto raw perlite, expanded perlite, bentonite and montmorillonite was characterized. Sorption experiments demonstrated that the clays are more efficient adsorbents compared with the perlites but their dye retention is less increased with pH and temperature. Higher dye aggregates are formed in all aluminosilicates due to the existence of adsorption locations that promote the agglomeration of the dye. The presence of dye monomers in bentonite indicates a second type of adsorption sites impairing the dyestuff aggregation. Seven adsorption models were applied to the experimental data; the obeying of the Langmuir and Harkins-Jura isotherms was better for the clays while the Freundlich, Halsey, Henderson, BET and Smith models fitted more successfully to the perlites. The applicability of the adsorption equations was correlated with the uniformity, homogeneity and distribution of the adsorption sites, the incorporation of self-assembled dye aggregates and the formation of self-organized multilayers of dye into the adsorbents. Thermodynamic quantities that characterize the sorption phenomena, i.e., enthalpy, entropy and free energy change of the adsorption, were calculated leading to conclusions on the efficiency of the adsorbing substrates and the properties of the sorbent-dye systems. © 2008 Elsevier Inc. All rights reserved