The role of 4-nitrobenzoic acid polymorphs in the crystallization process of organic acid–base multicomponent systems

CrystEngComm ◽  
2019 ◽  
Vol 21 (40) ◽  
pp. 6038-6047 ◽  
Author(s):  
Lilia Croitor ◽  
Mihaela F. Petric ◽  
Elisabeta I. Szerb ◽  
Gabriela Vlase ◽  
Paulina N. Bourosh ◽  
...  
Keyword(s):  
Solid State ◽  
Organic Acid ◽  
Crystallization Process ◽  
Time Dependent ◽  
Multicomponent Systems ◽  
Acid Base ◽  
Nitrobenzoic Acid ◽  
Comprehensive Characterization

An investigation of the role of 4-nitrobenzoic acid polymorphs in the crystallization process of dimethylethanolammonium 4-nitrobenzoate from solution and comprehensive characterization of time-dependent changes associated with solid-state transformations are presented.

scholarly journals Insight into the Ligand-Mediated Synthesis of Colloidal CsPbBr3 Perovskite Nanocrystals: The Role of Organic Acid, Base, and Cesium Precursors

ACS Nano ◽  
2016 ◽  
Vol 10 (8) ◽  
pp. 7943-7954 ◽  
Author(s):  
Aizhao Pan ◽  
Bo He ◽  
Xiaoyun Fan ◽  
Zeke Liu ◽  
Jeffrey J. Urban ◽  
...  
Keyword(s):  
Organic Acid ◽  
Acid Base ◽  
Perovskite Nanocrystals ◽  
Insight Into

scholarly journals Conceptualizing consumption in the imagination

2017 ◽  
Vol 18 (3) ◽  
pp. 327-347 ◽  
Author(s):  
Rebecca Jenkins ◽  
Mike Molesworth
Keyword(s):  
Consumer Research ◽  
Macro Level ◽  
Market Structures ◽  
Level Of Abstraction ◽  
Temporal Location ◽  
Individual Consumption ◽  
Presence And Absence ◽  
Comprehensive Characterization

In this article we extend theory relating to the imagination and markets by reviewing explicit and implicit work in marketing, consumer research and sociology, drawing on a broader literature that provides a more comprehensive characterization of imagining. We map consumption in the imagination in order to better define the concept and to differentiate forms of imagining according to a number of characteristics that are identified in the literature. These are as follows: (1) temporal location, (2) range of emotions, (3) degree of elaboration, (4) level of abstraction (5) purpose, and (6) prompts. We also consider the role of consumption in terms of its level of presence and absence in the imagination. We then present a trajectory of consumption in the imagination that seeks to account for the relationships and movements between forms of imagining and the marketplace, noting the importance of the imagination in terms of implications for macro-level market structures and individual consumption practice.

scholarly journals The role of thermal analysis in the development of high-iron-content kaolinite-based photocatalysts

2020 ◽  
Vol 142 (1) ◽  
pp. 289-299
Author(s):  
Veronika Vágvölgyi ◽  
Katalin Győrfi ◽  
Balázs Zsirka ◽  
Erzsébet Horváth ◽  
János Kristóf
Keyword(s):  
Iron Content ◽  
Adsorbed Water ◽  
Acid Base ◽  
High Iron Content ◽  
High Iron ◽  
Defect Sites ◽  
Heating Water ◽  
Coordinated Water

Abstract Dynamic and controlled-rate thermogravimetric analyses have been carried out on acid-treated (11 and 5.8 M HCl), high-iron-content kaolinites as potential photocatalysts. The mineral contaminants were determined by XRD, while the defect sites of reduced coordination number obtained by surface treatments were identified with 27Al MAS NMR spectroscopy. Upon heating, water is evolved from the surface-treated samples in three main stages: (1) removal of adsorbed water up to ~ 200 °C, (2) goethite dehydroxylation between 200 and 350 °C and (3) dehydroxylation of the clay in the 300–700 °C temperature range. Identification of water released from the above mass loss steps is difficult due to the significant overlap of steps 2 and 3, as well as to the presence of coordinated water at broken edges and defect sites (–OH2+ groups). As a result, the thermal behavior of surface-treated kaolinites should be taken into account both in the preparation of hybrids/composites and in the acid–base characterization of the catalytic surface.

scholarly journals The Role of Percent Volume Buried in the Characterization of Copper(I) Complexes for Lighting Purposes

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2647 ◽  
Author(s):  
Murat Alkan-Zambada ◽  
Edwin C. Constable ◽  
Catherine E. Housecroft
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Quantum Yields ◽  
X Ray ◽  
Photophysical Behavior

The usefulness of percent volume buried (%Vbur) as a readily quantifiable property is investigated with regard to [Cu(NN)(PP)]+ complexes of interest for lighting purposes. Photoluminescence quantum yields (PLQYs) and single crystal X-ray structures of 100 reported compounds were assembled, %Vbur of the ligand systems were calculated and analyzed for correlations. We found that increased shielding of the central Cu(I) cation relying on shared contributions of both (NN) and (PP) ligand systems led to increased PLQYs. These findings are of relevance for future characterizations of Cu(I)-based complexes and their photophysical behavior in the solid-state.

scholarly journals Functional and Structural Characterization of a Novel Isoamylase from Ostreococcus tauri and Role of the N-Terminal Domain

2020 ◽  
Vol 14 (1) ◽  
pp. 1-11
Author(s):  
Nicolas Hedín ◽  
Julieta Barchiesi ◽  
Diego F. Gomez-Casati ◽  
María V. Busi
Keyword(s):  
Crystallization Process ◽  
Biochemical Characterization ◽  
Carbohydrate Binding ◽  
Amino Acid Residues ◽  
Photosynthetic Organisms ◽  
Ostreococcus Tauri ◽  
The Family ◽  
Almost All

Background: The debranching starch enzymes, isoamylase 1 and 2 are well-conserved enzymes present in almost all the photosynthetic organisms. These enzymes are involved in the crystallization process of starch and are key components which remove misplaced α-1,6 ramifications on the final molecule. Aim: In this work, we performed a functional and structural study of a novel isoamylase from Ostreococcus tauri. Methods: We identified conserved amino acid residues possibly involved in catalysis. We also identified a region at the N-terminal end that resembles a Carbohydrate Binding Domain (CBM), which is more related to the family CBM48, but has no spatial conservation of the residues involved in carbohydrate binding. Results: The cloning, expression and biochemical characterization of this N-terminal region confirmed that it binds to polysaccharides, showing greater capacity for binding to amylopectin rather than total starch or amylose. Conclusion: This module could be a variant of the CBM48 family or it could be classified within a new CBM family.

scholarly journals Pro-biomics: Omics Technologies To Unravel the Role of Probiotics in Health and Disease

2021 ◽  
Author(s):  
Despoina Eugenia Kiousi ◽  
Marina Rathosi ◽  
Margaritis Tsifintaris ◽  
Pelagia Chondrou ◽  
Alex Galanis
Keyword(s):  
Probiotic Supplementation ◽  
Future Directions ◽  
Current Trends ◽  
Metabolomic Data ◽  
Analysis Of Results ◽  
Health And Disease ◽  
Multiple Levels ◽  
Comprehensive Characterization

ABSTRACT The comprehensive characterization of probiotic action has flourished during the past few decades, alongside the evolution of high-throughput, multiomics platforms. The integration of these platforms into probiotic animal and human studies has provided valuable insights into the holistic effects of probiotic supplementation on intestinal and extraintestinal diseases. Indeed, these methodologies have informed about global molecular changes induced in the host and residing commensals at multiple levels, providing a bulk of metagenomic, transcriptomic, proteomic, and metabolomic data. The meaningful interpretation of generated data remains a challenge; however, the maturation of the field of systems biology and artificial intelligence has supported analysis of results. In this review article, we present current literature on the use of multiomics approaches in probiotic studies, we discuss current trends in probiotic research, and examine the possibility of tailor-made probiotic supplementation. Lastly, we delve deeper into newer technologies that have been developed in the last few years, such as single-cell multiomics analyses, and provide future directions for the maximization of probiotic efficacy.

scholarly journals Comprehensive analysis of clustered mutations in cancer reveals recurrent APOBEC3 mutagenesis of ecDNA

2021 ◽  
Author(s):  
Erik N Bergstrom ◽  
Jens-Christian Luebeck ◽  
Mia Petljak ◽  
Vineet Bafna ◽  
Paul S. Mischel ◽  
...  
Keyword(s):  
Somatic Mutations ◽  
Human Cancer ◽  
Cancer Genes ◽  
Base Substitutions ◽  
Cancer Genomes ◽  
Cancer Types ◽  
Mutational Processes ◽  
Comprehensive Characterization

Clustered somatic mutations are common in cancer genomes with prior analyses revealing several types of clustered single-base substitutions, including doublet- and multi-base substitutions, diffuse hypermutation termed omikli, and longer strand-coordinated events termed kataegis. Here, we provide a comprehensive characterization of clustered substitutions and clustered small insertions and deletions (indels) across 2,583 whole-genome sequenced cancers from 30 cancer types. While only 3.7% of substitutions and 0.9% of indels were found to be clustered, they contributed 8.4% and 6.9% of substitution and indel drivers, respectively. Multiple distinct mutational processes gave rise to clustered indels including signatures enriched in tobacco smokers and homologous-recombination deficient cancers. Doublet-base substitutions were caused by at least 12 mutational processes, while the majority of multi-base substitutions were generated by either tobacco smoking or exposure to ultraviolet light. Omikli events, previously attributed to the activity of APOBEC3 deaminases, accounted for a large proportion of clustered substitutions. However, only 16.2% of omikli matched APOBEC3 patterns with experimental validation confirming additional mutational processes giving rise to omikli. Kataegis was generated by multiple mutational processes with 76.1% of all kataegic events exhibiting AID/APOBEC3-associated mutational patterns. Co-occurrence of APOBEC3 kataegis and extrachromosomal-DNA (ecDNA) was observed in 31% of samples with ecDNA. Multiple distinct APOBEC3 kataegic events were observed on most mutated ecDNA. ecDNA containing known cancer genes exhibited both positive selection and kataegic hypermutation. Our results reveal the diversity of clustered mutational processes in human cancer and the role of APOBEC3 in recurrently mutating and fueling the evolution of ecDNA.

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