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Articoli di riviste sul tema "Physico-Chemical interactions"

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Autore: Grafiati
Pubblicato: 1 giugno 2024

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1

Chaabna, Manel, Lina Aissa, Fadhila Debbah e Nassima Taleb. "Physico-chemical incompatibilities". Batna Journal of Medical Sciences (BJMS) 1, n. 2 (31 dicembre 2014): 107–10. http://dx.doi.org/10.48087/bjmstf.2014.1212.

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Compatibility problems are frequently encountered in hospitals, particularly in intensive care units. Physico-chemical incompatibilities (PCI) may have different origins and several types. The result is inactivation of the active ingredient reacted training or derivative(s) more or less toxic. The issue of PCI is made complex, moreover, by the fact that the reactions involved may be influenced by many factors. This chemical problem becomes a public health concern because it poses a risk to the patient.
2

Jolicoeur, Carmel, e Marc-André Simard. "Chemical admixture-cement interactions: Phenomenology and physico-chemical concepts". Cement and Concrete Composites 20, n. 2-3 (gennaio 1998): 87–101. http://dx.doi.org/10.1016/s0958-9465(97)00062-0.

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3

Petrak, Karel. "Physico-chemical basis of specific interactions involving carbohydrates". Advanced Drug Delivery Reviews 13, n. 3 (marzo 1994): 211–13. http://dx.doi.org/10.1016/0169-409x(94)90012-4.

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4

Rudenko, M. M., V. V. Punahin, N. I. Beloshytska e M. Kh Sydikov. "FEATURES PHYSICO-CHEMICAL INTERACTIONS IN ACTIVATED CEMENT SYSTEM". Science and Transport Progress, n. 11 (25 giugno 2006): 198–200. http://dx.doi.org/10.15802/stp2006/18823.

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The article enlists the main fundamentals of theoretical substantiation of physical and chemical interactions in the activated cement system. It has been shown that the course of the hydration and structure-forming processes of an activated cement system differs greatly from the processes, occurring in cement dough traditional design. The studies having been carried out are to a certain degree capable of explaining the mechanisms of ion interactions in the complex process of the structure-forming in the activated cement systems.
5

Heyrovský, Michael, e Barbora Prokopová. "Heterogeneous Physico-Chemical Interactions Following Electrode Reaction: Interaction of Folates with Thiols". Collection of Czechoslovak Chemical Communications 62, n. 2 (1997): 172–84. http://dx.doi.org/10.1135/cccc19970172.

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Folates do not react chemically with thiols in solution, however, they cause shifts of voltammetric reversible reduction peaks of disulfides towards positive potentials. This is explained as due to the formation of adducts between folates and thiols at the electrode surface. Analogous shifts, but towards negative potentials, were observed with the voltammetric reversible oxidation peak of a reduced form of folic acid after addition of thiols, and were ascribed to the same cause. According to this interpretation the shifts would provide a measure of free enthalpy of the weak interaction between the two partners and the electrode. It is suggested that the observed effect could serve as a simplified model of processes which occur between folates and proteins in the microheterogeneous structure of the living matter.
6

Fejős, Ida, Yang He, Gergely Völgyi, Adrienn Kazsoki, Jin Sun, Weiming Chen, Tamás Sohajda, Lajos Szente, Xiangrui Jiang e Szabolcs Béni. "Tapentadol enantiomers: Synthesis, physico-chemical characterization and cyclodextrin interactions". Journal of Pharmaceutical and Biomedical Analysis 88 (gennaio 2014): 594–601. http://dx.doi.org/10.1016/j.jpba.2013.10.005.

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7

Hanulová, Mária, e Matthias Weiss. "Membrane-mediated interactions – a physico-chemical basis for protein sorting". Molecular Membrane Biology 29, n. 5 (30 marzo 2012): 177–85. http://dx.doi.org/10.3109/09687688.2012.667838.

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8

Cruz dos Santos, Sandra, Nichole Osti Silva, João Batista dos Santos Espinelli, Marcelo Augusto Germani Marinho, Zeane Vieira Borges, Natália Bruzamarello Caon Branco, Fabrício Luiz Faita et al. "Molecular interactions and physico-chemical characterization of quercetin-loaded magnetoliposomes". Chemistry and Physics of Lipids 218 (gennaio 2019): 22–33. http://dx.doi.org/10.1016/j.chemphyslip.2018.11.010.

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9

Houria, Baazi, Kalla Mahdi e Tebbi Fatima Zohra. "Hydrochemical Characterisation of Groundwater Quality: Merdja Plain (Tebessa Town, Algeria)". Civil Engineering Journal 6, n. 2 (1 febbraio 2020): 318–25. http://dx.doi.org/10.28991/cej-2020-03091473.

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The objective of this work is to evaluate the physico-chemical quality of the groundwater of the Merdja plain and to determine the sources of mineralization. This quality is influenced by several environmental and anthropogenic factors such as geological context, climate, precipitation and interaction between groundwater and aquifers and human activities. A Principal Component Analysis (PCA) on samples taken from several wells spread over the entire Tebessa plain (Merdja) allowed us to detect two axes that explain 73.4% of the information. The first axis describes the variables related to mineralisation and the second one describes those related to agricultural activity. Multidimensional Positioning (MDS) confirmed the interaction of physico-chemical parameters between them and their influence on groundwater quality by highlighting three groups of wells according to their physico-chemical characteristics, particularly those containing high concentrations of nitrates. This contamination is mainly the result of spreading the fertilisers and wastes that are dumped into the plain without treatment. Salinization is the result of long-term interactions between groundwater and geological formations.
10

Bare, Yohanes, Nurul Imaniyah AHmad e Yohanes Nong Bunga. "Molecular Interaction of Chili Compounds (Capsicum annum L) as a COX-2 Inhibitor". Mangifera Edu 6, n. 2 (31 gennaio 2022): 115–28. http://dx.doi.org/10.31943/mangiferaedu.v6i2.124.

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Curly red chili (Capsicum annum L.) is a vegetable that has health benefits. Besides being used as an addictive substance in traditional medicine, Capsicum annum L. is also used for cough treatment, antiseptic, anti-irritant, anti-inflammatory. This research study aims to analyze the physico-chemical and its molecular interactions with COX-2. Capsaicin (CID: 1548943), dihydrocapsaicin (CID: 107982) and homocapsaicin (CID: 6442566) compounds were downloaded from pubchem. While the COX protein (ID: 6cox) from the Protein Data Bank. Molecular interaction and analized by HEX. 8.0.0 and Discovery Studio. The three compounds contained in curly red chilies have unique physico-chemical characteristics. The results of the interaction show that the curly mera chili has a physiological function by inhibiting the performance of COX-2
11

Popescu, Elena Irina, Ludmila Aricov, Sorin Mocanu, Iulia Matei, Elena Hristea, Rodica Baratoiu, Anca Leonties, Cristian Petcu, Elvira Alexandrescu e Gabriela Ionita. "Subtle influence on alginate gel properties through host–guest interactions between covalently appended cyclodextrin and adamantane units". New Journal of Chemistry 45, n. 18 (2021): 8083–91. http://dx.doi.org/10.1039/d1nj01278a.

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12

Skripkiūnas, Gintautas, Grigory Ivanovich Yakovlev, Ekaterina Karpova, Anastasiia Gordina e Arina Shaybadullina. "The Combined Effect of the Plasticizer and Multi-Walled Carbon Nanotubes on the Cement Hydration Products". Solid State Phenomena 276 (giugno 2018): 21–26. http://dx.doi.org/10.4028/www.scientific.net/ssp.276.21.

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There are many research devoted to the influence of carbon nanotubes (CNT) on the structure and properties of cement systems. In the course of this research, the combined influence of of multi-walled carbon nanotubes (MWCNT) and polycarboxylate (PCE) plasticizer on the products of hydration and the properties of hardened cement paste was investigated. The strength characteristics of nanomodified hardened cement paste and the hydration products were determined by the usage of modern methods of physico-mechanical and physico-chemical analyses. Based on the physico-chemical investigations, it was concluded the necessity of additional experiments, associated primary with questions of uniform distribution of the nanostructures and their chemical interactions with another components of admixture and cement system.
13

Moore, Thomas L., Laura Rodriguez-Lorenzo, Vera Hirsch, Sandor Balog, Dominic Urban, Corinne Jud, Barbara Rothen-Rutishauser, Marco Lattuada e Alke Petri-Fink. "Nanoparticle colloidal stability in cell culture media and impact on cellular interactions". Chemical Society Reviews 44, n. 17 (2015): 6287–305. http://dx.doi.org/10.1039/c4cs00487f.

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14

Hansen, Mackenzie M., Richard W. Hartel e Yrjö H. Roos. "Encapsulant-bioactives interactions impact on physico-chemical properties of concentrated dispersions". Journal of Food Engineering 302 (agosto 2021): 110586. http://dx.doi.org/10.1016/j.jfoodeng.2021.110586.

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15

Witt, P. Ch, F. Grabowski e H. H. Hahn. "Interactions between biological and physico-chemical mechanisms in biological phosphate elimination". Water Science and Technology 30, n. 6 (1 settembre 1994): 271–79. http://dx.doi.org/10.2166/wst.1994.0278.

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By combining a sequential P-extraction with batch experiments the presented investigations clarify the mechanisms of (enhanced) biological phosphate elimination and especially to answer the following questions: are any physicochemical mechanisms involved in the biological phosphate elimination? are there any interactions between biological and physicochemical unit operations? If so, are these of synergistic or antagonistic nature? The following main results were found: Results of batch experiments: – calcium decreases under anaerobic conditions; this indicates Ca-P-precipitation. – magnesium increases under anaerobic conditions and decreases under aerobic conditions just as phosphate does; there is a high correlation between dissolved magnesium and dissolved phosphorus. Therefore magnesium seems to participate in biological mechanisms (counter-ion of polyphosphates). – concerning the total P elimination efficiency both unit processes seem to have a synergistic effect (biologically mediated P-precipitation). Results of P-fractionations: – there is a certain amount of particulate physicochemically bound phosphorus, which should not be neglected. – although the biologically bound phosphorus dominates (as a rule), this amount depends on the concentration of the readily biodegradable COD significantly. – during the cyclic P-release/P-uptake not only transitions from soluble phase to particulate phase but alsotransfers within the particulate phase take place. – the total P-content of the activated sludge and the sum of the Non Reactive Phosphorus-fractions (without Phase Separation-Non Reactive Phosphorus) seem to be suitable to characterize the capacity of the biological phosphate elimination. Conclusions: Physicochemical mechanisms take part in the enhanced biological phosphate removal and they should be taken into consideration. Therefore they should be included into the deterministic model development.
16

Sarisuta, N., M. Kumpugdee, B. W. Müller e S. Puttipipatkhachorn. "Physico-chemical characterization of interactions between erythromycin and various film polymers". International Journal of Pharmaceutics 186, n. 2 (20 settembre 1999): 109–18. http://dx.doi.org/10.1016/s0378-5173(99)00140-4.

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17

Davis, Chelsea, e Cassie Castorena. "Implications of physico–chemical interactions in asphalt mastics on asphalt microstructure". Construction and Building Materials 94 (settembre 2015): 83–89. http://dx.doi.org/10.1016/j.conbuildmat.2015.06.026.

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18

Gröning, R., J. Breitkreutz e R. S. Müller. "Physico-chemical interactions between extracts of Hypericum perforatum L. and drugs". European Journal of Pharmaceutics and Biopharmaceutics 56, n. 2 (settembre 2003): 231–36. http://dx.doi.org/10.1016/s0939-6411(03)00094-8.

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19

Kaushal, Deepika, Dilbag S. Rana, Manish Kumar, Kailash Singh, Kuldeep Singh, Suvarcha Chauhan e Ahmad Umar. "Furosemide–Cetyltrimethylammonium Bromide Interactions in Aqueous Dimethylsulfoxide Solutions: Physico–Chemical Studies". Zeitschrift für Physikalische Chemie 233, n. 3 (26 marzo 2019): 413–30. http://dx.doi.org/10.1515/zpch-2017-1014.

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Abstract Interaction of a cardiovascular drug, Furosemide with cetyltrimethylammonium bromide (CTAB) has been studied in aqueous solutions of Dimethylsulfoxide (DMSO) with the help of density, speed of sound and conductivity measurements over a range of temperatures 293.15–313.15 K at interval of 5 K. The interaction parameters viz. apparent molar volume, Vϕ and apparent molar isentropic compression, κs,ϕ have been enumerated from density and speed of sound data. Also, variation in the micellization behavior has been explored by calculating critical micelle concentration, CMC. It has been observed that micellization tendency of the surfactant decreases in the presence of DMSO as compared to pure aqueous system. Moreover, the CMC values shift toward lower concentration with increase in Furosemide content because of increase in hydrophobic hydration which may be to hydrophobicity of drug molecule. The dependence of CMC in mole fraction (Xcmc) values on the temperature has been analyzed in terms of thermodynamics of the system by reporting the standard thermodynamic parameters i.e. standard Gibb’s free energy $(\Delta G_m^o),$ enthalpy $(\Delta H_m^o)$ and entropy $(\Delta S_m^o)$ of micellization for CTAB in mixed solvent systems. The entropies of micellization are all positive, and they compensate the enthalpies of the process. Compensation temperature, Tc has also been evaluated from enthalpy–entropy compensation whose values lies in Lumrys range (270–300 K).
20

Bujalowski, Wlodzimierz, Maria J. Jezewska e Paul J. Bujalowski. "Signal and binding. I. Physico-chemical response to macromolecule–ligand interactions". Biophysical Chemistry 222 (marzo 2017): 7–24. http://dx.doi.org/10.1016/j.bpc.2016.12.006.

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21

Cima, Francesca. "Larval Settlement on Marine Surfaces: The Role of Physico-Chemical Interactions". Journal of Marine Science and Engineering 11, n. 4 (19 aprile 2023): 859. http://dx.doi.org/10.3390/jmse11040859.

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Biofouling is the association of sessile aquatic organisms that rapidly settle on artificial hard substrata, thereby posing a large problem worldwide since its growth often causes severe damage to submerged structures [...]
22

Perez-Moral, Natalia, Paul W. Needs, Christina W. A. Moyle e Paul A. Kroon. "Hydrophobic Interactions Drive Binding between Vascular Endothelial Growth Factor-A (VEGFA) and Polyphenolic Inhibitors". Molecules 24, n. 15 (31 luglio 2019): 2785. http://dx.doi.org/10.3390/molecules24152785.

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Some polyphenols have been shown to inhibit, at physiological levels, the VEGF-induced VEGF receptor-2 signaling that causes angiogenesis, allegedly by direct interaction with VEGF and reducing the binding to its receptor VEGFR2. Surface plasmon resonance was used to measure the parameters of binding between VEGF and polyphenols as well as the nature of the interactions by assessing the effect of physico-chemical changes in the solution. CD spectrometry was used to determine any change in the secondary structure of the protein upon binding. The kinetic parameters (ka, kd, and KD) that characterise the binding to VEGF were measured for both inhibitor and non-inhibitor polyphenolic molecules. The effect of changes in the physico-chemical conditions of the solution where the binding occurred indicated that the nature of the interactions between VEGF and EGCG was predominantly of a hydrophobic nature. CD studies suggested that a change in the secondary structure of the protein occurred upon binding. Direct interaction and binding between VEGF and polyphenol molecules acting as inhibitors of the signaling of VEGFR2 has been measured for the first time. The binding between VEGF and EGCG seemed to be based on hydrophobic interactions and caused a change in the secondary structure of the protein.
23

Klučáková, Martina, Jitka Krouská e Michal Kalina. "Physico-Chemical Aspects of Metal–Fulvic Complexation". Processes 12, n. 5 (13 maggio 2024): 989. http://dx.doi.org/10.3390/pr12050989.

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The interactions of metal ions with fulvic acids were investigated from the point of view of the thermodynamic aspects of complexation as well as the size and charge of the formed complexes. Thermodynamic aspects were studied by means of isothermal titration calorimetry. Particle size distribution was determined by the method of dynamic light scattering and charge by the measurement of zeta potential. Complexation resulted in changes in particle size and charge. The particle size distribution was trimodal for fulvic acids and bimodal for fulvic complexes with calcium and magnesium, while copper–fulvic complexes had only one size fraction. The compensation of the negative charge of carboxylic and phenolic functional groups by positively charged metal ions resulted in an increase in zeta potential which became closer to zero in the case of copper–fulvic complexes. However, all metal–humic complexes behaved as colloidally unstable, which resulted in visually observable sedimentation. Calorimetric measurements provided positive values for changes in enthalpy, which indicated endothermic processes. In contrast, quantum chemical calculations as well as experiments with model compounds provided negative values indicating exothermic processes. Changes in Gibbs energy were determined as negative and changes in entropy as positive.
24

Kastritis, Panagiotis L., e Alexandre M. J. J. Bonvin. "On the binding affinity of macromolecular interactions: daring to ask why proteins interact". Journal of The Royal Society Interface 10, n. 79 (6 febbraio 2013): 20120835. http://dx.doi.org/10.1098/rsif.2012.0835.

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Interactions between proteins are orchestrated in a precise and time-dependent manner, underlying cellular function. The binding affinity, defined as the strength of these interactions, is translated into physico-chemical terms in the dissociation constant ( K d ), the latter being an experimental measure that determines whether an interaction will be formed in solution or not. Predicting binding affinity from structural models has been a matter of active research for more than 40 years because of its fundamental role in drug development. However, all available approaches are incapable of predicting the binding affinity of protein–protein complexes from coordinates alone. Here, we examine both theoretical and experimental limitations that complicate the derivation of structure–affinity relationships. Most work so far has concentrated on binary interactions. Systems of increased complexity are far from being understood. The main physico-chemical measure that relates to binding affinity is the buried surface area, but it does not hold for flexible complexes. For the latter, there must be a significant entropic contribution that will have to be approximated in the future. We foresee that any theoretical modelling of these interactions will have to follow an integrative approach considering the biology, chemistry and physics that underlie protein–protein recognition.
25

Beniwal, Vijay, e Anil Kumar. "Understanding positive and negative deviations in polarity of ionic liquid mixtures by pseudo-solvent approach". Physical Chemistry Chemical Physics 18, n. 34 (2016): 23853–63. http://dx.doi.org/10.1039/c6cp04440a.

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26

Hawkins, Alexander P., Andrea Zachariou, Stewart F. Parker, Paul Collier, Nathan Barrow, Ian P. Silverwood, Russell F. Howe e David Lennon. "Effect of steam de-alumination on the interactions of propene with H-ZSM-5 zeolites". RSC Advances 10, n. 39 (2020): 23136–47. http://dx.doi.org/10.1039/d0ra03871g.

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27

Giovannini, Tommaso, Franco Egidi e Chiara Cappelli. "Theory and algorithms for chiroptical properties and spectroscopies of aqueous systems". Physical Chemistry Chemical Physics 22, n. 40 (2020): 22864–79. http://dx.doi.org/10.1039/d0cp04027d.

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28

Vranić, Edina, Odon Planinšek, Andrijana Tivadar, Sabira Hadžović e Stanko Srčič. "Physico-Chemical Characterisation Of Different Clindamycin Phosphate Samples". Bosnian Journal of Basic Medical Sciences 7, n. 2 (20 maggio 2007): 182–89. http://dx.doi.org/10.17305/bjbms.2007.3078.

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Abstract (sommario):
For the majority of the pharmaceutical dosage forms, the substances that are used maintain solid state under the standard storage conditions, i.e. powders. The interactions of pharmaceutical powders (active ingredient(s) and excipients) with liquids and vapors (particularly aqueous solutions and their vapors) occur almost always during the production process. From the physical point of view, the interactions among individual components may differ from the expected because chemically identical substances obtained from different producers vary very much. These differences influence either the production process and/or the pharmaceutical form properties. In order to overcome these problems it is necessary to establish a control over the physico-chemical properties of the used materials.The aim of this work was to determine physico-chemical properties of three powder clindamycin phosphate samples (labeled as sample S1, S2 and S3) acquired through different suppliers. All the analysis were made for the purpose of establishing possible differences among the tested samples that showed variable physical stability in the solution: recrystallization of the S3 sample in the aqueous solution has been established during storage under standard conditions. On the basis of the obtained data it was possible to recognize the differences among the tested clindamycin phosphate samples and to explain the anomalous behavior of one sample.The surface free energy components for the investigated clindamycin phosphate samples were determined using Wu and Goodvan Oss method. The investigated clindamycin phosphate samples exhibit certain differences in surface free energy values as well as in surface morphology and thermal behavior. Comparison of γ+ and γ- values leads to the conclusion that all three clindamycin phosphate samples perform as monopolar, more electron acceptors, i.e. Lewis acids. However, an important difference exists between samples S1 and S2 on one and S3 on the other side. Sample S3 exhibits stronger acidic behavior, what could be connected with its recrystallization during the storage.The samples S1, S2 and S3 have different melting points e.g. “onset” temperatures. When the melting points move towards 200oC, the width of the “onset” temperature peak is especially important. In the case of wider peak, the potential for recrystallization seems to be higher.According to the stated, the sample S1 would be the “sample of choice” for the formulation of the stable pharmaceutical dosage form and has not shown any recrystallization tendencies during the storage period.
29

H, Sebii. "Physico-Chemical, Mechanical, Microstructural, and Antioxidant Properties of Chickpea Protein-Based Composite Bioactive Films". Food Science & Nutrition Technology 8, n. 4 (5 ottobre 2023): 1–11. http://dx.doi.org/10.23880/fsnt-16000320.

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Chickpea protein concentrate (CPC) was used in the preparation of edible bio-films. Glycerol and sorbitol, with a different ratios, were used as plasticizing agents. Physico-chemical, microstructure, and mechanical properties of CPC-based biofilms plasticized with glycerol (G100), sorbitol (S100), and a mix of glycerol and sorbitol (G50/S50) were investigated. G100 showed the highest hydrophilicity, solubility, and the lowest thickness compared to S100 and G50/S50. The mechanical properties analysis revealed that (G50/S50) possessed the highest elongation at break and tensile strength. All observed differences were attributed to the interactions between protein and plasticizer which were evaluated by FTIR. In addition, G100, S100, and G50/S50 films demonstrated high antioxidant activity.
30

Bertron, A., H. Ranaivomanana, N. Jacquemet, B. Erable, C. Sablayrolles, G. Escadeillas e A. Albrecht. "Physico-chemical interactions at the concrete-bitumen interface of nuclear waste repositories". EPJ Web of Conferences 56 (2013): 01002. http://dx.doi.org/10.1051/epjconf/20135601002.

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Olasagasti, F., M. C. Maurel e D. W. Deamer. "Physico-chemical interactions between compartment-forming lipids and other prebiotically relevant biomolecules". BIO Web of Conferences 2 (2014): 05001. http://dx.doi.org/10.1051/bioconf/20140205001.

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32

Chauhan, S., J. Jyoti e G. Kumar. "Non-ionic surfactant interactions in aqueous gelatin solution: A physico-chemical investigation". Journal of Molecular Liquids 159, n. 3 (aprile 2011): 196–200. http://dx.doi.org/10.1016/j.molliq.2011.01.008.

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33

Busscher, H. J., e H. C. Van Der Mei. "Physico-Chemical Interactions in Initial Microbial Adhesion and Relevance for Biofilm Formation". Advances in Dental Research 11, n. 1 (aprile 1997): 24–32. http://dx.doi.org/10.1177/08959374970110011301.

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Abstract (sommario):
This paper summarizes initial microbial adhesion events in dental plaque formation, including the physico-chemistry of the interaction between micro-organisms and solid substrata, detachment phenomena under the fluctuating shear of the oral cavity, co-adhesion between pairs of microbial strains, and biosurfactant release. A hypothesis is forwarded on how these initial events might influence the final microbial composition and structure of the plaque, although it is simultaneously emphasized that the necessary techniques for verification of the hypothesis have only recently become available, and supporting evidence is still to be collected.
34

Tournier, C., C. Sulmont-Rossé, E. Sémon, A. Vignon, S. Issanchou e E. Guichard. "A study on texture–taste–aroma interactions: Physico-chemical and cognitive mechanisms". International Dairy Journal 19, n. 8 (agosto 2009): 450–58. http://dx.doi.org/10.1016/j.idairyj.2009.01.003.

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35

Beniwal, Vijay, Shashi K. Shukla e Anil Kumar. "Deviation of polarity from linearity in liquid mixtures containing an ionic liquid". Physical Chemistry Chemical Physics 17, n. 47 (2015): 31613–17. http://dx.doi.org/10.1039/c5cp05921f.

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Abstract (sommario):
The physico-chemical properties of liquid mixtures, in general, exhibit deviations from linear behaviour with respect to their composition, arising out of different types of cross-intermolecular interactions (both specific and non-specific).
36

Novakovic, Jasmina, Eva Tvrzická, Václav Všetečka, Vladimír Pouzar e Ladislav Feltl. "Capillary Gas-Chromatographic Retention Behavior and Physico-Chemical Properties of Underivatized Equine Estrogens". Collection of Czechoslovak Chemical Communications 60, n. 5 (1995): 813–19. http://dx.doi.org/10.1135/cccc19950813.

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The capillary gas-chromatographic retention behavior of six underivatized equine estrogens (estrone, equilin, equilenin and their corresponding 17α-diols) on a mixed stationary phase (non-polar CP-Sil 5 CB and slightly polar CP-Sil 19 CB capillary columns coupled in series) was characterized by their Kovats retention indices and steroid numbers. In order to find whether a correlation exists between the chromatographic retention and some physico-chemical properties of the compounds, their octanol-water partition coefficients and dipole moments were measured. No straightforward correlation was observed between the physico-chemical properties and the retention behavior, which suggests that the GC separation of equine estrogens is governed by some specific electron donor-electron acceptor interactions of a chemical nature.
37

Domingo, Marc, e Jordi Faraudo. "Interaction between SARS-CoV-2 spike glycoprotein and human skin models: a molecular dynamics study". Soft Matter 17, n. 41 (2021): 9457–68. http://dx.doi.org/10.1039/d1sm01026c.

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The possibility of contamination of human skin by infectious virions plays an important role in indirect transmission of respiratory viruses but little is known about the fundamental physico-chemical aspects of the virus-skin interactions.
38

Marie, Veronna, e Johnson Lin. "Microbial indicators and environmental relationships in the Umhlangane River, Durban, South Africa". Open Life Sciences 13, n. 1 (2 novembre 2018): 385–95. http://dx.doi.org/10.1515/biol-2018-0047.

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AbstractThe use of rivers for recreational and domestic practices makes it imperative to scrutinize the water quality circulating within surrounding communities. The complexity of biological, physical and chemical constituents in water is constantly evolving. This study evaluated various microbial and physico-chemical parameters in a polluted river system over a 12-month period. Apart from an increase in chemical pollutants, elevated levels of E. coli, total (TC) and faecal (FC) coliforms, and Shigella species could be attributed to faecal contamination entering the catchment. Canonical correspondence analysis revealed a strong relationship between FC, TC and temperature whereas moderate interactions was seen between total dissolved solids, electrical conductivity, TC and FC populations. Furthermore, close relationships between the bacterial and phage communities were also observed. The complex interactions of these physico-chemical and microbial indicators could be due to anthropogenic activities, changing climatic conditions and the excreta of infected and non-infected individuals entering the river. Assessing the complexity of aquatic ecosystems can aid in the development of novel, customizable, inexpensive water purification tools.
39

Kodentsov, A. A., A. Paul e F. J. J. van Loo. "The Kirkendall Plane in Binary Interdiffusion Systems". Defect and Diffusion Forum 233-234 (dicembre 2004): 61–76. http://dx.doi.org/10.4028/www.scientific.net/ddf.233-234.61.

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There is now a considerable body of experimental evidence to indicate that in a volumediffusion controlled interaction the Kirkendall plane need not be unique. The Kirkendall plane can microstructurally be stable as well as unstable (it does not exist!). Under predictable circumstances, it can also bifurcate and even trifurcate. This can be rationalised in terms of Kirkendall velocity construction as well as from a purely chemical point of view considering diffusion-controlled interactions at the interphase interfaces. The physico-chemical approach is also used to explain significance of the Kirkendall effect in the morphogenesis of interdiffusion systems.
40

Rebers, Lisa, Tobias Granse, Günter Tovar, Alexander Southan e Kirsten Borchers. "Physical Interactions Strengthen Chemical Gelatin Methacryloyl Gels". Gels 5, n. 1 (17 gennaio 2019): 4. http://dx.doi.org/10.3390/gels5010004.

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Chemically cross-linkable gelatin methacryloyl (GM) derivatives are getting increasing attention regarding biomedical applications. Thus, thorough investigations are needed to achieve full understanding and control of the physico-chemical behavior of these promising biomaterials. We previously introduced gelatin methacryloyl acetyl (GMA) derivatives, which can be used to control physical network formation (solution viscosity, sol-gel transition) independently from chemical cross-linking by variation of the methacryloyl-to-acetyl ratio. It is known that temperature dependent physical network formation significantly influences the mechanical properties of chemically cross-linked GM hydrogels. We investigated the temperature sensitivity of GM derivatives with different degrees of modification (GM2, GM10), or similar degrees of modification but different methacryloyl contents (GM10, GM2A8). Rheological analysis showed that the low modified GM2 forms strong physical gels upon cooling while GM10 and GM2A8 form soft or no gels. Yet, compression testing revealed that all photo cross-linked GM(A) hydrogels were stronger if cooling was applied during hydrogel preparation. We suggest that the hydrophobic methacryloyl and acetyl residues disturb triple helix formation with increasing degree of modification, but additionally form hydrophobic structures, which facilitate chemical cross-linking.
41

Kudaikulova, Saule, Zulfiya Musapirova, Natalya Sobarina, Maira Umerzakova, Rinat Iskakov, Bulat Zhubanov e Marc J. M. Abadie. "Novel Polymer Composites on the Basis of Arylalicyclic Polyimide Blends. I. Polyimide/Polycarbonate & Polyimide/Polysulphone Blends". Eurasian Chemico-Technological Journal 6, n. 1 (7 aprile 2016): 7. http://dx.doi.org/10.18321/ectj326.

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The new composite materials based on dianhydride of tricyclodecentetracarbon acid and oxydianiline with two other thermally stable polymers, such as polycarbonate and polysulphone, are being reported. The synthesis of the polyimide blends was done through two ways: mechanical mixing of two homopolymer ingredients; and the so-called chemical mixing of polyimide comonomers with the above-mentioned polymers. The physico-chemical and physico-mechanical properties have been manifested in a broadening of their performance characteristics. It was not found any physical-chemical interactions between the two ingredients of the blend, which indicates the formation of a typical compatible polymer blend with an appropriate miscibility. Such new polyimide composite could be an ideal candidate for the preparation of reflective and conductive metallized polyimide blend films with wide mechanical performances.
42

Malihi, F. B., A. Khaani, N. Changizi e B. Adeeb. "Evaluation of Physico-Chemical Interactions between Linear Alkylbenzene Sulfonate (LAS) and Alcohol Ethoxylates". Tenside Surfactants Detergents 48, n. 5 (settembre 2011): 395–99. http://dx.doi.org/10.3139/113.110145.

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43

Pandey, Vrijesh Kumar, Anjali Awasthi, Reetesh Srivastava e Aashees Awasthi. "Molecular interactions of formamide with 2-dimethylaminoethanol and 2-diethylaminoethanol: Physico-chemical study". Journal of Molecular Liquids 219 (luglio 2016): 186–93. http://dx.doi.org/10.1016/j.molliq.2016.03.003.

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44

Kirkham, Jennifer, Steven J. Brookes, Roger C. Shore, Simon R. Wood, D. Alastair Smith, Jin Zhang, Haifeng Chen e Colin Robinson. "Physico-chemical properties of crystal surfaces in matrix–mineral interactions during mammalian biomineralisation". Current Opinion in Colloid & Interface Science 7, n. 1-2 (marzo 2002): 124–32. http://dx.doi.org/10.1016/s1359-0294(02)00017-1.

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45

Ricchelli, Fernanda, Daniela Stevanin e Giulio Jori. "PORPHYRIN-LIPOSOME INTERACTIONS: INFLUENCE OF THE PHYSICO-CHEMICAL PROPERTIES OF THE PHOSPHOLIPID BILAYER". Photochemistry and Photobiology 48, n. 1 (2 gennaio 2008): 13–18. http://dx.doi.org/10.1111/j.1751-1097.1988.tb02780.x.

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46

Mojzisova, Halina, Stéphanie Bonneau e Daniel Brault. "Structural and physico-chemical determinants of the interactions of macrocyclic photosensitizers with cells". European Biophysics Journal 36, n. 8 (13 luglio 2007): 943–53. http://dx.doi.org/10.1007/s00249-007-0204-9.

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47

Pannetier, Nathalie, Abdel Khoukh e Jeanne François. "Physico-chemical study of sucrose and calcium ions interactions in alkaline aqueous solutions". Macromolecular Symposia 166, n. 1 (marzo 2001): 203–8. http://dx.doi.org/10.1002/1521-3900(200103)166:1<203::aid-masy203>3.0.co;2-i.

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48

Polster, Miroslav, Bohuslav Rittich e Renata Žaludová. "Relationship between biological activity of phenols and their physico-chemical parameters". Collection of Czechoslovak Chemical Communications 51, n. 1 (1986): 241–48. http://dx.doi.org/10.1135/cccc19860241.

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Abstract (sommario):
The present work deals with the relationship between biological activities of differently substituted phenols and their physico-chemical parameters expressing the influence of hydrophobic, electronic and steric factors. The testing was performed with the fungi Trychophyton gypseum and Trychophyton gypseum var. Kaufman-Wolf and the yeast Candida albicans. Significant relationship between biological activity and pKA values was calculated. The interactions between individual factors as well as the influence of the position of substituents on quantitative structure-activity relationships are discussed.
49

Guzmán, Eduardo, Eva Santini, Michele Ferrari, Libero Liggieri e Francesca Ravera. "Interaction of Particles with Langmuir Monolayers of 1,2-Dipalmitoyl-Sn-Glycero-3-Phosphocholine: A Matter of Chemistry?" Coatings 10, n. 5 (10 maggio 2020): 469. http://dx.doi.org/10.3390/coatings10050469.

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Lipid layers are considered among the first protective barriers of the human body against pollutants, e.g., skin, lung surfactant, or tear film. This makes it necessary to explore the physico-chemical bases underlying the interaction of pollutants and lipid layers. This work evaluates using a pool of surface-sensitive techniques, the impact of carbon black and fumed silica particles on the behavior of Langmuir monolayers of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC). The results show that the incorporation of particles into the lipid monolayers affects the surface pressure–area isotherm of the DPPC, modifying both the phase behavior and the collapse conditions. This is explained considering that particles occupy a part of the area available for lipid organization, which affects the lateral organization of the lipid molecules, and consequently the cohesion interactions within the monolayer. Furthermore, particles incorporation worsens the mechanical performance of lipid layers, which may impact negatively in different processes presenting biological relevance. The modification induced by the particles has been found to be dependent on their specific chemical nature. This work tries to shed light on some of the most fundamental physico-chemical bases governing the interaction of pollutants with lipid layers, which plays an essential role on the design of strategies for preventing the potential health hazards associated with pollution.
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Iryna Tsykhanovska, Iryna, Mykola Riabchykov, Olexandr Alexandrov, Victoriya Evlash, Oksana Bryzytska, Sergey Gubsky, Tatyana Lazareva e Olga Blahyi. "Physico-Chemical Studies of the Interaction Mechanism of Double and Trivalent Iron Double Oxide Nano-Particles with Serpin Protein Ovalbumin and Water". Chemistry & Chemical Technology 17, n. 3 (20 settembre 2023): 481–94. http://dx.doi.org/10.23939/chcht17.03.481.

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The novelty of the work is the theoretical justification and experimental confirmation of the mechanism of interaction of Fe3O4 nanoparticles with Н2О and ovalbumin-OVA, which was carried out with the help of a complex of physical and chemical studies. It was determined that the mechanism is based on the clustero-philicity of nanoparticles and hydrogen, electrostatic and van der Waals interactions. It was established that the interaction of Fe3O4 nanoparticles with OVA took place by the mechanism of static quenching with the formation of an intermolecular non-fluorescent complex that chan¬ges the native structure of OVA. The binding constant varied from 3.3×105 to 4.8×105 L•mol-1 depending on the pH value of the medium and temperature. Thermo¬dy¬namic calculations confirmed the spontaneity of the bin¬ding process with the predominance of the enthalpy factor.
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