scholarly journals Fluorescence and Physico-Chemical Properties of Hydrogenated Detonation Nanodiamonds

2020 ◽  
Vol 6 (1) ◽  
pp. 7 ◽  
Author(s):  
Giannis Thalassinos ◽  
Alastair Stacey ◽  
Nikolai Dontschuk ◽  
Billy J. Murdoch ◽  
Edwin Mayes ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Detonation Nanodiamonds ◽  
Fluorescence Properties ◽  
Spectroscopy Analysis ◽  
Time Resolved ◽  
Colloidal Properties ◽  
Physico Chemical ◽  
First Time ◽  
Electron Energy Loss ◽  
Surface Chemistries

Hydrogenated detonation nanodiamonds are of great interest for emerging applications in areas from biology and medicine to lubrication. Here, we compare the two main hydrogenation techniques—annealing in hydrogen and plasma-assisted hydrogenation—for the creation of detonation nanodiamonds with a hydrogen terminated surface from the same starting material. Synchrotron-based soft X-ray spectroscopy, infrared absorption spectroscopy, and electron energy loss spectroscopy were employed to quantify diamond and non-diamond carbon contents and determine the surface chemistries of all samples. Dynamic light scattering was used to study the particles’ colloidal properties in water. For the first time, steady-state and time-resolved fluorescence spectroscopy analysis at temperatures from room temperature down to 10 K was performed to investigate the particles’ fluorescence properties. Our results show that both hydrogenation techniques produce hydrogenated detonation nanodiamonds with overall similar physico-chemical and fluorescence properties.

scholarly journals Consumer Description by Check-All-That-Apply Questions (CATA) of the Sensory Profiles of Commercial and New Mandarins. Identification of Preference Patterns and Drivers of Liking

Foods ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 468 ◽  
Author(s):  
Paula Tarancón ◽  
Amparo Tárrega ◽  
Pablo Aleza ◽  
Cristina Besada
Keyword(s):  
Consumer Demand ◽  
Chemical Properties ◽  
Similar Profile ◽  
Late Season ◽  
Physico Chemical ◽  
Commercial Cultivars ◽  
Preference Patterns ◽  
Sensory Profiles ◽  
First Time ◽  
New Cultivars

In the last few years, the interest in developing new mandarin cultivars of superior quality has grown as a response to the increasing consumer demand of this appreciated fruit. This study evaluated the sensory profiles of five new late-season mandarin cultivars (‘Alborea‘, ’Coral‘, ’Omet‘, ’Matiz‘ and ’Tri-703‘) and six commercial cultivars found contemporarily in stores (‘Clemenules‘, ’Nova‘, ’Tango‘, ’Nadorcott‘, ‘Orri’ and ‘Ortanique’). The sensory profiles of the cultivars were described by consumers through CATA questions. Consumers’ acceptability and the main physico-chemical properties were also evaluated. Twenty-two out of 23 CATA terms differed significantly for the sensory profiles of the studied cultivars. The new cultivars shared a similar profile, described mainly as “very intense taste”, “refreshing taste”, “very aromatic” and “juicy”, and these characteristics were quite different from those of the commercial cultivars. By combining acceptability and CATA questions, drivers of liking for segments of consumers with different preference patterns were identified. This is the first time that the sensory profiles of mandarin cultivars have been described by consumers. A significant number of consumers preferred the new mandarin cultivars to the commercial ones, which allows them a promising introduction on the market.

Structure–property relationship in fluorene-based polymer films obtained by electropolymerization of 4,4′-(9-fluorenylidene)-dianiline

RSC Advances ◽  
2015 ◽  
Vol 5 (117) ◽  
pp. 97016-97026 ◽  
Author(s):  
Mariana-Dana Damaceanu ◽  
Luminita Marin
Keyword(s):  
Polymer Films ◽  
Chemical Properties ◽  
Structure Property ◽  
Property Relationship ◽  
Physico Chemical ◽  
Structure Property Relationship ◽  
First Time

For the first time, the electropolymerization of 4,4′-(9-fluorenylidene)-dianiline and physico-chemical properties of the obtained polymer films are reported.

scholarly journals Preliminary Evaluation of the Safety and Probiotic Potential of Akkermansia muciniphila DSM 22959 in Comparison with Lactobacillus rhamnosus GG

2020 ◽  
Vol 8 (2) ◽  
pp. 189 ◽  
Author(s):  
Autilia Cozzolino ◽  
Franca Vergalito ◽  
Patrizio Tremonte ◽  
Massimo Iorizzo ◽  
Silvia J. Lombardi ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Biofilm Formation ◽  
Lactobacillus Rhamnosus ◽  
Chemical Properties ◽  
Preliminary Evaluation ◽  
Lactobacillus Rhamnosus Gg ◽  
Akkermansia Muciniphila ◽  
Probiotic Potential ◽  
Physico Chemical ◽  
First Time

In this study, for the first time, we examined some of the physico-chemical properties of the cell surface of Akkermansia muciniphila DSM 22959, comparing it with those of Lactobacillus rhamnosus GG—one of the most extensively studied probiotic microorganisms. In particular, hydrophobicity, auto-aggregation, co-aggregation, and biofilm formation were investigated. In addition, antibiotic susceptibility, co-culture, and antimicrobial activity of the two strains were compared. Hydrophobicity was evaluated using xylene and toluene, showing that A. muciniphila DSM 22959 possessed moderate hydrophobicity. A. muciniphila showed a faster and higher auto-aggregation ability than Lb. rhamnosus GG, but a lower aptitude in biofilm formation. In the co-aggregation test, the best performance was obtained by Lb. rhamnosus GG. Regarding the susceptibility to antibiotics, the differences between the two strains were remarkable, with A. muciniphila DSM 22959 showing resistance to half of the antibiotic tested. Interesting results were also obtained with regard to the stimulating effect of Lb. rhamnosus GG on the growth of A. muciniphila when co-cultured.

scholarly journals On Distance-Based Topological Descriptors of Chemical Interconnection Networks

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Min Hu ◽  
Haidar Ali ◽  
Muhammad Ahsan Binyamin ◽  
Bilal Ali ◽  
Jia-Bao Liu ◽  
...  
Keyword(s):  
Interconnection Networks ◽  
Topological Index ◽  
Chemical Properties ◽  
Topological Descriptors ◽  
Silicate Network ◽  
Pi Index ◽  
Szeged Index ◽  
Physico Chemical ◽  
Chain Silicate ◽  
First Time

Structure-based topological descriptors of chemical networks enable us the prediction of physico-chemical properties and the bioactivities of compounds through QSAR/QSPR methods. Topological indices are the numerical values to represent a graph which characterises the graph. One of the latest distance-based topological index is the Mostar index. In this paper, we study the Mostar index, Szeged index, PI index, ABC GG index, and NGG index, for chain oxide network COX n , chain silicate network CS n , ortho chain S n , and para chain Q n , for the first time. Moreover, analytically closed formulae for these structures are determined.

scholarly journals Evaluation of new biodegradable fluid on the basis  of accelerated durability test, FTIR and ICP spectroscopy

2017 ◽  
Vol 63 (No. 1) ◽  
pp. 1-9 ◽  
Author(s):  
Tulík Juraj ◽  
Hujo Ľubomir ◽  
Kosiba Jan ◽  
Jablonický Juraj ◽  
Jánošová Michela
Keyword(s):  
Ftir Spectroscopy ◽  
Chemical Properties ◽  
Hydraulic Pump ◽  
Spectroscopy Analysis ◽  
Durability Test ◽  
Operational Conditions ◽  
Physico Chemical ◽  
Hydraulic Fluids ◽  
Accelerated Durability Test ◽  
Agricultural Machines

The paper deals with the properties of newly developed synthetic biodegradable fluid in terms of its operational and physico-chemical properties. The evaluated fluid is a new biodegradable fluid MOL Farm UTTO Synt, which belongs to the group of universal gear-hydraulic fluids. At the beginning, the fluid was subjected to accelerated durability test under laboratory conditions, with monitoring its impact on technical conditions of the used hydraulic pump UD 25. After that, the FTIR spectroscopy analysis was performed, with monitoring thermal oxidation, oxidation by acid products, water content and additives depletion. Depletion of additives was also monitored by the ICP spectroscopy. Based on these results, it can be stated that the newly developed fluid has good operational and physico-chemical properties after the durability test and is suitable for further testing under operational conditions without a risk of damaging agricultural machines.

scholarly journals Identification of the Main Metabolites of a Marine-Derived Strain of Penicillium brevicompactum Using LC and GC MS Techniques

Metabolites ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 55
Author(s):  
Francesco Vinale ◽  
Maria Michela Salvatore ◽  
Rosario Nicoletti ◽  
Alessia Staropoli ◽  
Gelsomina Manganiello ◽  
...  
Keyword(s):  
Main Product ◽  
Chemical Properties ◽  
Metabolomic Profile ◽  
Parallel Application ◽  
Physico Chemical ◽  
Anemonia Sulcata ◽  
Colon Cell ◽  
Penicillium Brevicompactum ◽  
Valuable Compounds ◽  
First Time

Marine-derived fungi are an important source of many valuable compounds with original structures and diverse physico-chemical properties. In this work, the metabolomic profile of a strain of Penicillium brevicompactum, recovered from a snakelocks sea anemone (Anemonia sulcata), was investigated through the parallel application of LC-ESI-HRMS, GC-MS, and NMR. Our strategy allowed the identification of mycophenolic acid, brevianamide A, and several compounds belonging to the thiosilvatins. Among the latter, five products are reported for the first time in this species. The main product of this series, cis-bis(methylthio)silvatin, was also tested for antiproliferative activity on both cancer and non-tumoral colon cell lines.

scholarly journals On Degree-Based Topological Indices of Symmetric Chemical Structures

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 619 ◽  
Author(s):  
Jia-Bao Liu ◽  
Haidar Ali ◽  
Muhammad Shafiq ◽  
Usman Munir
Keyword(s):  
Molecular Descriptor ◽  
Molecular Graph ◽  
Chemical Properties ◽  
Chemical Compounds ◽  
Topological Indices ◽  
Chemical Structures ◽  
Physico Chemical ◽  
First Time ◽  
Ga Index ◽  
Atom Bond

A Topological index also known as connectivity index is a type of a molecular descriptor that is calculated based on the molecular graph of a chemical compound. Topological indices are numerical parameters of a graph which characterize its topology and are usually graph invariant. In QSAR/QSPR study, physico-chemical properties and topological indices such as Randić, atom-bond connectivity (ABC) and geometric-arithmetic (GA) index are used to predict the bioactivity of chemical compounds. Graph theory has found a considerable use in this area of research. In this paper, we study HDCN1(m,n) and HDCN2(m,n) of dimension m , n and derive analytical closed results of general Randić index R α ( G ) for different values of α . We also compute the general first Zagreb, ABC, GA, A B C 4 and G A 5 indices for these Hex derived cage networks for the first time and give closed formulas of these degree-based indices.

Computing topological polynomials of mesh-derived networks

2018 ◽  
Vol 10 (06) ◽  
pp. 1850077 ◽  
Author(s):  
Muhammad Imran ◽  
Abdul Qudair Baig ◽  
Shafiq Ur Rehman ◽  
Haidar Ali ◽  
Roslan Hasni
Keyword(s):  
Mesh Networks ◽  
Molecular Graph ◽  
Chemical Properties ◽  
Chemical Compounds ◽  
Topological Descriptors ◽  
Cut Edge ◽  
Physico Chemical ◽  
First Time ◽  
Ga Index ◽  
Atom Bond

Topological descriptors are numerical parameters of a molecular graph which characterize its molecular topology and are usually graph invariant. In QSAR/QSPR study, physico-chemical properties and topological indices such as Randić, atom-bond connectivity [Formula: see text] and geometric-arithmetic (GA) index are used to predict the bioactivity of chemical compounds. Graph theory has found a considerable use in this area of research. The counting polynomials are those polynomials having at exponent the extent of a property partition and coefficients the multiplicity/occurrence of the corresponding partition. All of the studied interconnection mesh networks in this paper are motivated by the molecular structure of a Sodium chloride NaCl. In this paper, Omega, Sadhana and PI polynomials are computed for mesh-derived networks. These polynomials were proposed on the ground of quasi-orthogonal cut edge strips in polycyclic graphs. These polynomials count equidistant and non-equidistant edges in graphs. Moreover, the analytical closed formulas of these polynomials for mesh-derived networks are computed for the first time.

scholarly journals Laurdan and Di-4-ANEPPDHQ probe different properties of the membrane

2016 ◽  
Author(s):  
Mariana Amaro ◽  
Francesco Reina ◽  
Martin Hof ◽  
Christian Eggeling ◽  
Erdinc Sezgin
Keyword(s):  
Cell Biology ◽  
Lipid Membrane ◽  
Chemical Properties ◽  
Emission Spectra ◽  
Spectral Shift ◽  
Membrane Lipid ◽  
Time Resolved ◽  
Lipid Packing ◽  
Physico Chemical ◽  
Polarity Sensitive

AbstractLipid packing is a crucial feature of cellular membranes. Quantitative analysis of membrane lipid packing can be achieved using polarity sensitive probes whose emission spectrum depends on the lipid packing. However, detailed insight into the exact mechanism that causes the spectral shift is essential to interpret the data correctly. Here, we analysed frequently used polarity sensitive probes, Laurdan and di-4-ANEPPDHQ, to test whether the underlying physical mechanisms of their spectral shift is the same, thus whether they report on the same physico-chemical properties of the cell membrane. Their steady-state spectra as well as time-resolved emission spectra in solvents and model membranes showed that they probe different properties of the lipid membrane. Our findings are important for the application of these dyes in cell biology.

scholarly journals Physico-chemical properties investigation of softwood surface after treatment with organic anhydride

2013 ◽  
Vol 11 (12) ◽  
pp. 2098-2106 ◽  
Author(s):  
Ruxanda Bodîrlău ◽  
Carmen-Alice Teacă ◽  
Dan Roşu ◽  
Liliana Roşu ◽  
Cristian-Dragoş Varganici ◽  
...  
Keyword(s):  
Chemical Treatment ◽  
Photoelectron Spectroscopy ◽  
Succinic Anhydride ◽  
Chemical Properties ◽  
Weight Percent Gain ◽  
Weight Percent ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Physico Chemical ◽  
Thermal Stability Of

AbstractWood originating from a softwood species was subjected to chemical treatment by reaction with succinic anhydride in N, N-dimethylformamide at different concentration values. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analysis were used to study changes that occurred on a softwood surface. The extent of chemical treatment on softwood was evaluated by determining the weight percent gain values. Thermal properties of modified softwood and the water absorption were also evaluated. The chemical treatment with succinic anhydride influenced the thermal stability of the softwood samples with increasing anhydride concentration levels.

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