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Artykuły w czasopismach na temat „Amorphous substances”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 29 lipca 2024

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1

Antosik, Agata, Joanna Szafraniec, Krzysztof Niwiński, and Renata Jachowicz. "Amorphous drug substances." Farmacja Polska 74, no. 11 (November 30, 2018): 671–78. http://dx.doi.org/10.32383/farmpol/118638.

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Wang, Bo, and Yuan Ming Song. "Study on the Difference of Amorphous Substances of Coal Ashes." Advanced Materials Research 287-290 (July 2011): 1189–92. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1189.

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There is much difference among the amorphous substances of different coal ashes, the important basis for their utilization. The micromorphology and content of the amorphous substances were measured by scanning electron microscopy (SEM) and chemical method respectively, and the 28d compressive strength ratio was also used to characterize their contribution to the cement-coal ashes system. The results show that the amorphous substances of BFBC/CFBC ashes are irregular and loose textured, which are significantly different from those of PC fly ashes that are spherical and compact. The content and

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3

Shklovskii, V. A., and V. M. Kuz'menko. "Explosive crystallization of amorphous substances." Uspekhi Fizicheskih Nauk 157, no. 2 (1989): 311. http://dx.doi.org/10.3367/ufnr.0157.198902c.0311.

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Shklovskiĭ, V. A., and V. M. Kuz'menko. "Explosive crystallization of amorphous substances." Soviet Physics Uspekhi 32, no. 2 (February 28, 1989): 163–80. http://dx.doi.org/10.1070/pu1989v032n02abeh002681.

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Webster, Gregory K., Cynthia A. Pommerening, Whitney W. Harman, Mathew A. Gragg, Jian-Hwa Han, and Daniel J. Taylor. "Exploiting Kinetic Solubility Differences for Low Level Detection of Crystallinity in Amorphous Drug Formulations." Current Pharmaceutical Analysis 16, no. 5 (June 15, 2020): 529–38. http://dx.doi.org/10.2174/1573412915666181210144338.

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Background: Enabling formulations have been implemented by the pharmaceutical industry as an effective tool for keeping Active Pharmaceutical Ingredient (API) in an amorphous state. Upon dosing in the amorphous state, many drugs which fail to demonstrate bioactivity due to the limited solubility and bioavailability of their crystalline form become bioavailable. Purpose: The analytical techniques use today for crystallinity detection are challenged by the sensitivity and robustness needed to achieve a 5% quantitation limit in low dose drug products. Our laboratory has developed a novel procedur

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6

Sheka, E. F. "Spectroscopy of amorphous substances with molecular structure." Uspekhi Fizicheskih Nauk 160, no. 2 (1990): 263. http://dx.doi.org/10.3367/ufnr.0160.199002c.0263.

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Sheka, E. F. "Spectroscopy of amorphous substances with molecular structure." Soviet Physics Uspekhi 33, no. 2 (February 28, 1990): 147–66. http://dx.doi.org/10.1070/pu1990v033n02abeh002546.

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8

Fratzl, P., G. Vogl, and S. Klaumünzer. "Small-angle scattering from porous amorphous substances." Journal of Applied Crystallography 24, no. 5 (October 1, 1991): 588–92. http://dx.doi.org/10.1107/s0021889890012225.

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9

Mikhailov, E., S. Vlasenko, S. T. Martin, T. Koop, and U. Pöschl. "Amorphous and crystalline aerosol particles interacting with water vapor – Part 1: Microstructure, phase transitions, hygroscopic growth and kinetic limitations." Atmospheric Chemistry and Physics Discussions 9, no. 2 (March 20, 2009): 7333–412. http://dx.doi.org/10.5194/acpd-9-7333-2009.

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Abstract. Interactions with water are crucial for the properties, transformation and climate effects of atmospheric aerosols. Here we outline characteristic features and differences in the interaction of amorphous and crystalline aerosol particles with water vapor. Using a hygroscopicity tandem differential mobility analyzer (H-TDMA), we performed hydration, dehydration and cyclic hydration&amp;dehydration experiments with aerosol particles composed of levoglucosan, oxalic acid and ammonium sulfate (diameters ~100–200 nm, relative uncertainties <0.4%, relative humidities <5% to 95% a

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10

Shimizu, Y., H. Sogabe, and Y. Terashima. "The effects of colloidal humic substances on the movement of non-ionic hydrophobic organic contaminants in groundwater." Water Science and Technology 38, no. 7 (October 1, 1998): 159–67. http://dx.doi.org/10.2166/wst.1998.0289.

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A controlled experimental study of the sorption of colloidal humic substances (humic acid) and a non-ionic hydrophobic organic compound (naphthalene) onto typical inorganic constituents of aquifer solids was performed using four types of model solid phases {i.e., individual model solids (montmorillonite, kaolinite, amorphous aluminosilicate gel, and amorphous iron oxides) and combined model solids (montmorillonite coated by amorphous aluminosilicate gel or iron oxides)}, which are synthesized in the laboratory. The batch experimental results indicated that the sorption of non-ionic hydrophobic

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11

Battaglini, Ana Paula Pavão, Alexandre Urbano, Vanerli Beloti, Edson Antonio Rios, Juliana Ramos Pereira, and Rafael Fagnani. "X-ray diffraction has limited applicability in investigation of milk tampering." Journal of Dairy Research 86, no. 3 (August 2019): 337–40. http://dx.doi.org/10.1017/s0022029919000566.

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AbstractThe aim of this work was to use X-ray diffraction to identify substances used for adulteration of raw milk and to determine if crystallographic analysis can detect extraneous substances in milk. Two unknown substances were sent anonymously by employers linked to the dairy chain, who claimed that they were added directly in milk prior to water addition by truck drivers. The samples were analyzed by X-ray diffraction and submitted to physicochemical analysis. The first substance was identified by X-ray diffraction as sodium citrate, complying with its physicochemical attributes, such as

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12

Mikhailov, E., S. Vlasenko, S. T. Martin, T. Koop, and U. Pöschl. "Amorphous and crystalline aerosol particles interacting with water vapor: conceptual framework and experimental evidence for restructuring, phase transitions and kinetic limitations." Atmospheric Chemistry and Physics 9, no. 24 (December 16, 2009): 9491–522. http://dx.doi.org/10.5194/acp-9-9491-2009.

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Abstract. Interactions with water are crucial for the properties, transformation and climate effects of atmospheric aerosols. Here we present a conceptual framework for the interaction of amorphous aerosol particles with water vapor, outlining characteristic features and differences in comparison to crystalline particles. We used a hygroscopicity tandem differential mobility analyzer (H-TDMA) to characterize the hydration and dehydration of crystalline ammonium sulfate, amorphous oxalic acid and amorphous levoglucosan particles (diameter ~100 nm, relative humidity 5–95% at 298 K). The experime

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13

Nozaki, Jorge, Edivaldo Egea Garcia, and Joji Suguita. "ADSORPTION OF GASEOUS SUBSTANCES ON CHEMICAL AND ELECTROLYTIC MANGANESE DIOXIDE." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 6, no. 7 (December 20, 1998): 7–15. http://dx.doi.org/10.48141/sbjchem.v6.n7.1998.10_1998_2.pdf.

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The adsorption of mercury, arsine, hydrocyanic acid, and hydrogen sulfide on amorphous chemical manganese dioxide (CMD) and electrolytic manganese dioxide (EMD) has been investigated. Variables such as agitation time, pH, temperature, the mass of adsorbent, and concentration of adsorbate were studied. The adsorption process obeys a Freundlich type isotherm over the concentration range investigated. Wads of Lujfa cylindrica Roem were used as a substrate for CMD production. For gaseous substances, this amorphous material showed better sorption capacity than EMD.

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14

Alexander, Keith, and C. Judson King. "FACTORS GOVERNING SURFACE MORPHOLOGY OF SPRAY-DRIED AMORPHOUS SUBSTANCES." Drying Technology 3, no. 3 (August 1985): 321–48. http://dx.doi.org/10.1080/07373938508916275.

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15

Sanditov, D. S., and A. A. Mashanov. "On some features of glass transition in amorphous substances." Doklady Physical Chemistry 477, no. 2 (December 2017): 231–34. http://dx.doi.org/10.1134/s0012501617120077.

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16

Darmaev, Migmar V., Michael I. Ojovan, Alexey A. Mashanov, and Timur A. Chimytov. "The Temperature Interval of the Liquid–Glass Transition of Amorphous Polymers and Low Molecular Weight Amorphous Substances." Applied Sciences 13, no. 4 (February 20, 2023): 2742. http://dx.doi.org/10.3390/app13042742.

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We present calculation results of the temperature interval δTg characterizing the liquid–glass transition in amorphous materials obtained on the basis of available data of the empirical parameters C1 and C2 in the Williams–Landel–Ferry (WLF) viscosity equation. We consider the unambiguous dependence of the relative transition temperature interval δTg/Tg on the fraction of the fluctuation volume fg frozen at the glass transition temperature Tg utilizing Sanditov’s model of delocalized atoms. The parameter f = ΔVe/V, which determines the molecular mobility characteristic of delocalized atoms in

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17

Vranić, Edina. "Amorphous Pharmaceutical Solids." Bosnian Journal of Basic Medical Sciences 4, no. 3 (August 20, 2004): 35–39. http://dx.doi.org/10.17305/bjbms.2004.3383.

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Amorphous forms are, by definition, non-crystalline materials which possess no long-range order. Their structure can be thought of as being similar to that of a frozen liquid with the thermal fluctuations present in a liquid frozen out, leaving only “static” structural disorder. The amorphous solids have always been an essential part of pharmaceutical research, but the current interest has been raised by two developments: a growing attention to pharmaceutical solids in general, especially polymorphs and solvates and a revived interest in the science of glasses and the glass transition.Amorphou

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18

Abrosimova, G. E., and I. M. Shmytko. "The use of single-crystal cuvettes with the properties of an optical shutter in X-ray diffractometers." Industrial laboratory. Diagnostics of materials 84, no. 6 (August 1, 2018): 34–37. http://dx.doi.org/10.26896/1028-6861-2018-84-6-34-37.

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The atomic structure of substances can be studied using X-ray diffraction methods. X-ray diffractometers contains X-ray source and goniometer with a detector of scattered radiation. A sample holder (a cuvette) with the material under study is placed in the center of the goniometer. The diffraction spectrum which represents the structure of the sample under study is recorded upon angular scanning of the sample and detector. Study of crystalline powders, amorphous substances, nanocrystalline and partially crystalline objects is often based on the Bragg-Brentano scheme (θ – 2θ-scanning) with dive

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19

Harder, D. E., J. Chong, R. Rohringer, K. Mendgen, A. Schneider, K. Welter, and G. Knauf. "Ultrastructure and cytochemistry of extramural substances associated with intercellular hyphae of several rust fungi." Canadian Journal of Botany 67, no. 7 (July 1, 1989): 2043–51. http://dx.doi.org/10.1139/b89-258.

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Several types of extramural substance(s) associated with rust fungal intercellular hyphae were identified using a variety of tissue processing techniques. With conventional glutaraldehyde–OsO4 fixing and uranyl acetate – lead citrate staining, little material could be discerned on the hyphal surfaces in nonsporulating areas except at locations of cell–cell contact, where a lightly staining fibrous or darker staining amorphous material was apparent. Freeze-substitution or freeze-fracturing preserved greater amounts of coating material, which could be distinguished from the outer fungal wall lay

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20

Siddharatha Dhoppalapudi and Prashanth Parupathi. "Hot melt extrusion: A single-step continuous manufacturing process for developing amorphous solid dispersions of poorly soluble drug substances." GSC Advanced Research and Reviews 13, no. 2 (November 30, 2022): 126–35. http://dx.doi.org/10.30574/gscarr.2022.13.2.0311.

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In today’s world with increasing patient population, the demand for pharmaceutical medications is increasing enormously. However, poor solubility of drug substances and underdeveloped manufacturing process are affecting the revenue of the pharmaceutical industries. Improving the solubility and establishing a robust manufacturing process is the primary prerequisite of the developmental scientists. Among various approaches amorphous solid dispersion has gained a tremendous response for improving the solubility of the drug substances. In addition, the process of hot melt extrusion has attracted t

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21

Wang, Xiuteng, Guoliang Liu, Ling Lin, Dongfeng Gao, Jing Liu, Fei Fang, and Xiaodong Huo. "Environmental Risk Analysis of Leachable Substances from Vitreous Residue of Solid Wastes Treated by High Temperature Melting." Advances in Engineering Technology Research 4, no. 1 (March 6, 2023): 100. http://dx.doi.org/10.56028/aetr.4.1.100.2023.

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High temperature melting is a harmless treatment technology for solid wastes, which is applicable to hazardous wastes containing heavy metals and other harmful substances, obtaining amorphous glassy substances. Vitreous residue usually has high stability and low leaching toxicity. This paper simulates the leaching test of vitreous residue under natural conditions in ordinary rain and acid rain, systematically detects the concentration of leachable substances of typical residue, and analyses its environmental risks according to groundwater quality standards, indicating that harmful substances s

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22

Golubev, E. A., and O. V. Kovaleva. "Nanostructurization in X-ray amorphous organic substances of geological origin." Russian Journal of General Chemistry 81, no. 6 (June 2011): 1366–74. http://dx.doi.org/10.1134/s1070363211060417.

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23

Sanditov, D. S., A. A. Mashanov, and M. V. Darmaev. "Energy of Atomic Delocalization and Glass Temperature of Amorphous Substances." Polymer Science, Series A 62, no. 2 (March 2020): 79–84. http://dx.doi.org/10.1134/s0965545x20020054.

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Chechetkina, E. A. "Medium-range order in amorphous substances: A modified layer model." Solid State Communications 91, no. 2 (July 1994): 101–4. http://dx.doi.org/10.1016/0038-1098(94)90262-3.

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25

Akulova, Yu O., N. O. Gonchukova, T. V. Larionova, and O. V. Tolochko. "Structural relaxation in amorphous substances with highly non-equilibrium structure." Journal of Non-Crystalline Solids 261, no. 1-3 (January 2000): 252–59. http://dx.doi.org/10.1016/s0022-3093(99)00585-2.

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26

Li, Z. G., L. Liang, R. L. Harlow, C. M. Foris, R. E. Olson, T. M. Sielecki, J. Liu, R. D. Vickery, and M. B. Maurin. "New Applications of Electron Microscopy in Pharmaceuticals: Crystallinity Assessment and Polymorph Determination." Microscopy and Microanalysis 6, S2 (August 2000): 1004–5. http://dx.doi.org/10.1017/s143192760003751x.

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Recently, transmission electron microscopy has been used in crystallinity assessments and unit cell parameter/polymorph determinations in solid drug substances [1,2]. Lumaxis™ (roxifiban) is a glycoprotein nb/ffla (GPHb/HIa) antagonist discovered recently at The DuPont Pharmaceuticals Company [3] currently undergoing clinical evaluation for the treatment of thrombotic disorders. Lumaxis™ is converted in vivo to a zwitterionic active metabolite, XV459. As reported here, we have assessed by electron microscopy and x-ray diffraction the crystallinity of XP280, the benzenesulfonate salt of XV459,

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27

Caminiti, Ruggero, Carmen Munoz Roca, Daniel Beltran-Porter, and Antonella Rossi. "Amorphous Complexes MM (EDTA) (H2O)4 · 2H2O . LAXS and XPS Investigation of the Local Structure." Zeitschrift für Naturforschung A 43, no. 6 (June 1, 1988): 591–96. http://dx.doi.org/10.1515/zna-1988-0610.

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Abstract The amorphous MM (EDTA)(H2O)4·2 H2O (M = Ni,Co) substances are made up of infinite chains of alternating "hydrated" and "chelated" octahedra bridged by carboxylate groups: M(H2O)4 - M(EDTA)-M(H2O)4-... . XPS enables to ascertain that the coordination of the EDTA ligand in the amorphous phase is identical to that in the crystalline phase, i.e., hexacoordination toward the M atom and two bridging groups in the Ni -Ni, Co - Co compounds.

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Solovyeva, Svetlana N., Marina P. Sutunkova, Sergey V. Kuzmin, Larisa I. Privalova, Vladimir B. Gurvich, and Boris A. Katsnelson. "Assessment of cytotoxicity of an original industrial aerosol containing a high percentage of amorphous silica in the nanometer range." Hygiene and sanitation 100, no. 9 (September 20, 2021): 938–42. http://dx.doi.org/10.47470/0016-9900-2021-100-9-938-942.

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Introduction. At the current stage of hygienic evaluation, the substantiation of at least approximate safe concentrations in the ambient air of populated areas for nanoparticles is an up-to-date challenge. Its persistence dissolves the guidelines for risk management and divests the supervisory bodies of legal support. A comparative toxicological evaluation of the studied substance and its chemical analogue is one of the guidelines for the academic substantiation of the hygienic standards for the permissible content of hazardous substances in the air. It already has previously defined exposure

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29

Sanditov, D. S. "Free volume of amorphous substances in the model of delocalized atoms." Doklady Physical Chemistry 464, no. 2 (October 2015): 255–57. http://dx.doi.org/10.1134/s0012501615100097.

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Chechetkina, E. A. "Synergetic model for the first sharp diffraction peak in amorphous substances." Solid State Communications 87, no. 3 (July 1993): 171–74. http://dx.doi.org/10.1016/0038-1098(93)90469-4.

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31

Ankele, Jürgen, Joachim Mayer, Peter Lamparter, Peter Lamparter, and Siegfried Steeb. "Investigation of the Structure of Amorphous Substances by Means of Electron Diffraction." Zeitschrift für Naturforschung A 49, no. 7-8 (August 1, 1994): 771–75. http://dx.doi.org/10.1515/zna-1994-7-807.

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Abstract The structure factor of amorphous germanium was determined using 120 kV electrons, an Ω-filter for the elimination of inelastically scattered electrons and a correction procedure for multiple scattering. The structure factor thus obtained is in good accordance to that obtained with X-rays and neutrons, respectively.

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32

Sato, Kiminori, and Minoru Hirano. "Age-Related Changes of Elastic Fibers in the Superficial Layer of the Lamina Propria of Vocal Folds." Annals of Otology, Rhinology & Laryngology 106, no. 1 (January 1997): 44–48. http://dx.doi.org/10.1177/000348949710600109.

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An investigation was carried out to determine the morphologic characteristics of elastic fibers in the superficial layer of the lamina propria of aged vocal folds (EFAVFs). Excised human adult vocal folds served as the material for this study. Scanning and transmission electron microscopic observations were made. The results can be summarized as follows. First, the EFAVFs were composed of amorphous substances and microfibrils. The amorphous substances increased in amount and the microfibrils became less numerous. Second, the EFAVFs ran in various directions, were branched, and formed a complic

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Chechetkina, E. A. "The first sharp diffraction peak in glasses and in other amorphous substances." Journal of Physics: Condensed Matter 5, no. 43 (October 25, 1993): L527—L530. http://dx.doi.org/10.1088/0953-8984/5/43/001.

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G. Choconi, Roberto, Alberto A. Ghini, Victor H. Conzonno, and Alicia Fernández Cirelli. "Humic Substances from sediments of Lobos Pond (Argentina). Isolation, Characterization and Limnological Implications." Eclética Química Journal 36, no. 2 (October 31, 2017): 128. http://dx.doi.org/10.26850/1678-4618eqj.v36.2.2011.p128-141.

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Humic substances (HS) were isolated from the sediments of Lobos Pond (Argentina) using mild conditions to preserve their native structure. The HS (humic and fulvic acids) were characterized by means of elemental analysis and FTIR spectroscopy. Also a by-product obtained during fulvic acids (FA) fractionation (an amorphous white solid residue) was analyzed. Results revealed possible interactions between FA and inorganic-organic substances that may have implications referring to bioavailability. Other limnological implications, such as autochtonous origin of HS linked with the hydrology, and cha

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Choconi, Roberto G., Alberto A. Ghini, Victor H. Conzonno, and Alicia Fernández Cirelli. "Humic substances from sediments of Lobos Pond (Argentina). Isolation, characterization and limnological implications." Eclética Química 36, no. 2 (2011): 128–41. http://dx.doi.org/10.1590/s0100-46702011000200007.

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Humic substances (HS) were isolated from the sediments of Lobos Pond (Argentina) using mild conditions to preserve their native structure. The HS (humic and fulvic acids) were characterized by means of elemental analysis and FTIR spectroscopy. Also a by-product obtained during fulvic acids (FA) fractionation (an amorphous white solid residue) was analyzed. Results revealed possible interactions between FA and inorganic-organic substances that may have implications referring to bioavailability. Other limnological implications, such as autochtonous origin of HS linked with the hydrology, and cha

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36

Sanditov, D. S., M. V. Darmaev, and V. V. Mantatov. "Estimation of the parameter of the main equation of the glass transition of amorphous polymers and other amorphous substances." Polymer Science Series A 58, no. 2 (March 2016): 302–6. http://dx.doi.org/10.1134/s0965545x16020176.

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Olkhov, Anatoly A., Polina M. Tyubaeva, Yulia N. Zernova, Valery S. Markin, Regina Kosenko, Anna G. Filatova, Kristina G. Gasparyan, and Alexey L. Iordanskii. "The Influence of Technological Factors and Polar Molecules on the Structure of Fibrillar Matrices Based on Ultrafine Poly-3-hydroxybutyrate Fibers Obtained via Electrospinning." Technologies 11, no. 5 (September 6, 2023): 118. http://dx.doi.org/10.3390/technologies11050118.

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The article examines the regularities of structure formation of ultrafine fibers based on poly-3-hydroxybutyrat under the influence of technological (electrical conductivity, viscosity), molecular (molecular weight), and external factors (low-molecular and nanodispersed substances of different chemical natures). Systems with polar substances are characterized by the presence of intermolecular interactions and the formation of a more perfect crystalline fiber structure. Changes in technological and molecular characteristics affect the fiber formation process, resulting in alterations in the mor

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38

Li, Qun, Zhi Xuan Zhang, Si Ming Liu, and Ji Xin Su. "Properties of Slag and Ash from the Incinerator in Biomass Power Plants." Advanced Materials Research 512-515 (May 2012): 579–82. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.579.

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The properties of slag and ash generated from a biomass power plant were analyzed by various characterization methods and the sulfur was tracked. The results showed that the slag and ash contain major elements like Si, S, K and Ca etc and primary substances like SiO2, CaCO3etc. Sulfur is in the form of amorphous soluble salts and insoluble materials in residual carbon.

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Kim, Jiyoung, Chan Hee Lee, Ran Hee Kim, and Eun Jeong Shin. "Characterization of White and Black Deposits on the Surface of Korean Stone Cultural Heritages." Microscopy and Microanalysis 19, S5 (August 2013): 167–71. http://dx.doi.org/10.1017/s1431927613012580.

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AbstractWhite and black deposits have been frequently observed on the surface of Korean stone cultural heritages, and they are considered as damage factors in both conservation and esthetic points of view. In order to set up the appropriate conservation remedy, it is important to know their origins, characteristics, and compositions. In this study, optical and scanning electron microscopes (SEMs) equipped with an energy-dispersive spectrometer (EDS) and X-ray diffractometer were employed to determine the white and black deposits. It was found that both deposits consisted mainly of calcium carb

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40

Ponyatovsky, E. G. "A thermodynamic approach toT–Pphase diagrams of substances in liquid and amorphous states." Journal of Physics: Condensed Matter 15, no. 36 (August 29, 2003): 6123–41. http://dx.doi.org/10.1088/0953-8984/15/36/304.

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41

Ganguli, Dibyendu. "Polyamorphism in Liquids and Amorphous Substances: An Analogue of Polymorphism in Crystalline Solids." Transactions of the Indian Ceramic Society 68, no. 2 (April 2009): 65–80. http://dx.doi.org/10.1080/0371750x.2009.11082161.

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42

Konda, Kishore Kumar, and Siddharatha Dhoppalapudi. "A Review of Various Manufacturing Approaches for Developing Amorphous Solid Dispersions." Journal of Drug Delivery and Therapeutics 12, no. 6 (November 15, 2022): 189–200. http://dx.doi.org/10.22270/jddt.v12i6.5787.

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In recent years amorphous solid dispersions (ASD) has gained a tremendous response for improving the solubility of poorly water-soluble drug substances. Despite the stability challenges, various ASD commercial products have been successfully launched into the market over the last two decades. Among various manufacturing approaches, hot melt extrusion (HME) and spray drying techniques have attracted industries attributing to their simple manufacturing processes. In addition, KinetisolÒ, a solvent-free approach, is also being most widely investigated for developing ASDs since the thermal exposur

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Li, Linghan, Tianci Xu, Faping Zhang, Chunhua Du, and Song He. "Preparation of Super-Flexible Silica Aerogel and Its Application in Oil–Water Separation." Gels 9, no. 9 (September 12, 2023): 739. http://dx.doi.org/10.3390/gels9090739.

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Using silica as the precursor, and methyltrimethoxysilane and dimethyldimethoxysilane as the silicon sources, a super-flexible hydrophobic lipophilic gel solid was prepared via hydrolysis, drying, solvent replacement, and atmospheric-pressure drying. The characterization test showed that the sample had good flexibility, hydrophobicity, an amorphous structure, and a hydrophobic contact angle of 137°. Through the adsorption separation experiment, it was concluded that the adsorption separation rate of aerogel to oil substances is related to the viscosity of the oil substances. The hydrophobic an

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Sainte-Marie, Guy, and Bernard Sainte-Marie. "Reproductive products in the adult snow crab (Chionoecetes opilio). I. Observations on spermiogenesis and spermatophore formation in the vas deferens." Canadian Journal of Zoology 77, no. 3 (September 1, 1999): 440–50. http://dx.doi.org/10.1139/z98-229.

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Some of the events unfolding in the vas deferens of the adult snow crab (Chionoecetes opilio) were examined by means of light microscopy. Sperm cells entered the vas deferens as precursors of immature spermatids and developed into immature or mature spermatids within it. However, spermatozoa were not observed in the male reproductive tract. Two types of amorphous matter were added successively to sperm cells in the vas deferens. The first type was periodic acid - Schiff (PAS)-positive and apparently induced spermiogenesis when present in a sufficiently large amount. However, a smaller amount o

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Zhorov, Georgiy Aleksandrovich, Lyubov Lvovna Zakharova, Vasiliy Ivanovich Dorozhkin, and Elizaveta Arkadievna Denisova. "Control of Ecotoxicants Content in Feed Additives and Veterinary Pharmacological Products." BIO Web of Conferences 37 (2021): 00041. http://dx.doi.org/10.1051/bioconf/20213700041.

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The article is devoted to the control of ecotoxicants content in mineral and organic substances of natural and artificial origin used in the production of feed additives and pharmacological veterinary agents. In the context of the growing technogenic load on the environment, the probability of detecting increased background levels of natural and technogenic ecotoxicants in mineral and organic raw materials for the production of feed additives and veterinary products increases significantly. In this regard, more attention should be paid to the study of substances of artificial origin with a min

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Zolotov, S. A., I. A. Dain, N. B. Demina, A. S. Zolotova, and E. S. Ponomarev. "The Effect of Solvents and Drying Temperature on the Physicochemical Properties of Darunavir and Darunavir Ethanolate Substances." Drug development & registration 10, no. 1 (February 25, 2021): 67–73. http://dx.doi.org/10.33380/2305-2066-2021-10-1-67-73.

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Introduction. Usage of aggressive conditions (solvents, high temperature, etc.) in a dosage form manufacturing can lead to a change in the properties of a pharmaceutical substance. Darunavir (D) amorphous and darunavir ethanolate (DE) crystalline both have poor solubility, ability to pseudopolymorphism and are sensitive to high temperatures.Aim. Study the effect of solvents and drying temperature on the physicochemical properties of D and DE substancesMaterials and methods. D (Mylan Laboratories Limited), DE (Mylan Laboratories Limited), D (reference standard) 99,9 % (MSN Pharmachem Private Li

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Hu, Shu Gang, Xian Jun Lu, and Hai Li Niu. "Research on Properties and Reaction Mechanism of Blast Furnace Slag Backfilling Cementing Material." Applied Mechanics and Materials 692 (November 2014): 454–59. http://dx.doi.org/10.4028/www.scientific.net/amm.692.454.

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According to XRD, DTA and SEM detections, the hydration products of blast furnace slag based cementing material SL, SLG. were studied in different age periods. The XRD analysis of cementing material SL hydration products showed the composition of hydration products were mainly amorphous substances, few crystalline substances. Characteristic peak of ettringite, such as AFt, hadn’t been found in the spectral line of DTA, and it hadn’t been found in the figures of SEM, either, which was accordant with the conclusion that the cementing performance of SL mainly coming from gel of hydrated calcium s

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Volkov, Dmitry S., Olga B. Rogova, and Mikhail A. Proskurnin. "Temperature Dependences of IR Spectra of Humic Substances of Brown Coal." Agronomy 11, no. 9 (September 11, 2021): 1822. http://dx.doi.org/10.3390/agronomy11091822.

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The capabilities of temperature-monitored IR spectroscopy for studying the organic matter and mineral composition of humic substances (HS) were tested. Temperature dependences of the mid-IR spectra of humic substances heated in the air in the range 25–215 °C (298–488 K, with a step of 2.5 °C)—for three commercially available samples isolated from brown coal (leonardite)—were performed. The characteristic bands were identified, and their changes in band maxima positions and intensities were compared. From the viewpoint of interpretation of HS components, the spectra were divided into regions of

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Bashouti, M. Y., A. Manshina, A. Povolotckaia, A. Povolotskiy, A. Kireev, Y. Petrov, M. Mačković та ін. "Direct laser writing of μ-chips based on hybrid C–Au–Ag nanoparticles for express analysis of hazardous and biological substances". Lab on a Chip 15, № 7 (2015): 1742–47. http://dx.doi.org/10.1039/c4lc01376j.

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Shpotyuk, Oleh, Zdenka Lukáčová Bujňáková, Peter Baláž, Andriy Kovalskiy, Małgorzata Sznajder, Jozef Cebulski, Yaroslav Shpotyuk, Pavlo Demchenko, and Ihor Syvorotka. "Equimolar As4S4/Fe3O4 Nanocomposites Fabricated by Dry and Wet Mechanochemistry: Some Insights on the Magnetic–Fluorescent Functionalization of an Old Drug." Materials 17, no. 8 (April 10, 2024): 1726. http://dx.doi.org/10.3390/ma17081726.

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Multifunctional nanocomposites from an equimolar As4S4/Fe3O4 cut section have been successfully fabricated from coarse-grained bulky counterparts, employing two-step mechanochemical processing in a high-energy mill operational in dry- and wet-milling modes (in an aqueous solution of Poloxamer 407 acting as a surfactant). As was inferred from the X-ray diffraction analysis, these surfactant-free and surfactant-capped nanocomposites are β-As4S4-bearing nanocrystalline–amorphous substances supplemented by an iso-compositional amorphous phase (a-AsS), both principal constituents (monoclinic β-As4S

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