jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Xiaomei Huang | Meiying Zhao | Shan Lin | Min Xu | Linchun Li
Source: Preprints.org (preprint, 2021-07-12)
Field: Chemistry — Organic Chemistry

Metabolomic Characterizations of Fullerene Nanomaterials Potentiate Muscle of Clownfish (Amphiprion Ocellaris) Fullerene nanomaterials exposure often causes a variety of diseases. Many studies have pointed out that fullerene nanomaterials can be studied in fish. However, there are few studies on health risk assessment of clownfish with lower doses of fullerene nanoparticles or different exposure durations. In this study, we set 1.5% and 3.0% for low- and high-dose fullerene nanomaterials exposure concentrations, respectively. Meanwhile, we performed a time-series analysis to investigate that the activation of lipid and amino acids metabolism after fullerene nanomaterials exposure in clownfish. 1368 metabolites were detected from clownfish by using liquid chromatography-mass spectrometry (LC-MS) analyses. Our results suggest that exposure to lower fullerenes nanoparticles may have a certain promoting effect on clownfish overall length, body length and weight. At the same time, the activation of potential metabolic pathways enriched by different metabolites in KEGG pathway may also indicate the positive promoting effect of fullerene nanoparticles after exposure. The present work indicates that it is particularly important to find the concentration window for fullerene nanomaterials to improve government safety guidelines, especially when these are applied to assess the health risk of human. Nanomaterials ; Fullerene ; Metabolomics ; Chemistry ; Human health ; Nanotechnology ; Nanoparticle ; Biophysics ; Environmental chemistry ; Materials science ; Biology ; Chromatography ; Medicine ; Organic chemistry Fullerene Chemistry and Applications
Authors: Ching‐Seng Ang | Joanna Sacharz | Michael G. Leeming | Shuai Nie | Swati Varshney | Nichollas E. Scott | Nicholas A. Williamson
Source: bioRxiv (Cold Spring Harbor Laboratory) (preprint, 2021-06-15)
Field: Chemistry — Spectroscopy

Getting more out of FLAG-Tag co-immunoprecipitation mass spectrometry experiments using FAIMS Abstract Co-immunoprecipitation of proteins coupled to mass spectrometry is critical for the understanding of protein interaction networks. In instances where a suitable antibody is not available, it is common to graft synthetic tags onto target protein sequences and allowing the use of commercially available antibodies for affinity purification. A common approach is through FLAG-Tag co-immunoprecipitation. To allow the selective elution of protein complexes, competitive displacement using a large molar excess of the tag peptides is often carried out. Yet, this creates downstream challenges for the mass spectrometry analysis due to the presence of large quantities of these peptides. Here, we demonstrate that Field Asymmetric Ion Mobility Spectrometry (FAIMS), a gas phase ion separation device prior to mass spectrometry analysis can be applied to FLAG-Tag co-immunoprecipitation experiment to increase the depth of protein coverage. By excluding these abundant tag peptides, we were able to observe deeper coverage of interacting proteins and as a result, deeper biological insights, without the need for additional sample handling or altering sample preparation protocols. Immunoprecipitation ; Mass spectrometry ; Ion-mobility spectrometry ; Chemistry ; Chromatography ; Elution ; Gas phase ; Analytical Chemistry (journal) ; Biochemistry Mass Spectrometry Techniques and Applications ; Advanced Proteomics Techniques and Applications ; RNA and protein synthesis mechanisms
Authors: Marzieh Piryaei | Mir Mahdi | Sayna Jodatvand | W Cheong | F Ali | J Choi | J Lee | K Yune Sung | J Nilsson | P Spgel | S Nilsson | M Quaglia | B Sellergren | E De Lorenzi | F Lanza | N Masqu | R Marc | F Borrull | E Koster | C Crescenzi | W Den Hoedt | K Ensing | G De Jong | M Celiz | D Aga | L Coln | M.-M Zheng | R Gong | X Zhao | Y.-Q Feng | P Gurnani | T Floyd | J Tanaka | C Stubbs | D Lester | C Sanchez-Cano | S Perrier | S Xue | F Meng | P Zhang | J Bao | J Wang | K Zhao | L Rocha | H Soares | M Mendes | A Cabrita | F Schaberle | L Arnaut | B Becker | X Feng | Y Yin | A Holzinger | L Abbasy | A Mohammadzadeh | M Hasanzadeh | N Razmi | Y Sun | Y Guo | M Jia | N Ai | Y Dong | Y Zheng | L Fu | B Yu | H Zhang | J Wu | X Yu | H Wu | W Kong | Z Mazouz | M Mokni | N Fourati | C Zerrouki | F Barbault | M Seydou | R Kalfat | N Yaakoubi | A Omezzine | A Bouslema | A Othmane | Y Kou | T Wu | H Zheng | N Kadasala | S Yang | C Guo | L Chen | Y Liu | J Yang | R Serrano | G Grindlay | P Niedzielski | L Gras | J Mora | A Ciechanowska | K Popiolek-Barczyk | K Pawlik
Source: Biointerface Research in Applied Chemistry (article, 2021-02-13)
Field: Chemistry — Analytical Chemistry

RAFT Method for Preparation of Molecularly Imprinted Polymer–SBA15 Nanocomposite as a Pipette Tip Solid-Phase Microextraction Adsorbent Methoxyfenozide-selective surface molecularly imprinted polymer (MIP) sorbent was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization based on support matrix of SBA-15. The size, morphology, composition, and properties of the prepared nanocomposite have also been characterized and determined using scanning electron microscopy (SEM) and Fourier-transform- infrared (FT-IR) spectroscopy. A miniaturized solid-phase extraction procedure has been developed for ultra-trace determination of methoxyfenozide adsorbed on polymethacrylic acid-functionalized Santa Barbara Amorphous type material (SBA-15), which is packed into a pipette- tip (PT). The PT-SPE was assembled by packing 2.0 mg of nanocomposite of MIP as sorbent into a 100 μL pipette tip. The method was optimized for several important extraction parameters such as sample volume, pH, amount of sorbent, and eluent solvent. The results determine that the prepared adsorbent has a high extraction power. High sensitivity, non-use of organic solvent, high selectivity, and low detection limits are the unique advantages of the proposed method. Sorbent ; Materials science ; Solid phase extraction ; Nanocomposite ; Molecularly imprinted polymer ; Adsorption ; Extraction (chemistry) ; Fourier transform infrared spectroscopy ; Polymerization ; Solvent ; Chromatography ; Polymer ; Chemical engineering ; Nuclear chemistry ; Analytical Chemistry (journal) ; Chemistry ; Selectivity ; Organic chemistry ; Nanotechnology ; Composite material Analytical chemistry methods development ; Analytical Chemistry and Chromatography ; Mass Spectrometry Techniques and Applications
Authors: Swathi Swaminathan
Source: Digital Commons - USU (Utah State University) (article, 2021-10-08)
Field: Materials Science — Biomaterials

Bio-Inspired Materials and Micro/Nanostructures Enabled by Peptides and Proteins The development of a general approach for non-destructive chemical and biological functionalization of materials could expand opportunities for both fundamental studies and creating various device platforms. Phage display has emerged as a powerful method for selecting peptides that possess enhanced selectivity and binding affinity toward a variety of targets. In this study, a powerful yet benign approach for identifying binding motifs to materials like (Poly) dimethylsiloxane, epoxy, and (Poly) ethylenetetraphthalate and peptide nanotubes has been demonstrated via comprehensively screened phage-displayed peptides. Further, along with the development of microstructures, micropatterns and micro-molecular self-assembly, recognition with phage-displayed peptides can be specifically localized in these microstructures. In addition, the development of a facile approach for fabricating a library of precisely positioned nanostructures and microfluidic systems based on mammalian hair offers exciting opportunities in fundamental research and practical applications. The current top-down and bottom-up nanofabrication methods have been restricted in accessibility in standard labs due to their high cost and complexity. Novel fabrication methods utilizing biomimetic materials and natural proteins for large-scale nanopatterning with hierarchical assembly of functional materials have been reported. It is anticipated that these results could open up exciting opportunities in the use of peptide-recognized materials in fundamental biochemical recognition studies, as well as in applications ranging from analytical storage devices, hybrid materials, sensors, surface and interface, to cell biology. Nanotechnology ; Nanostructure ; Chemistry ; Data science ; Materials science ; Computer science Supramolecular Self-Assembly in Materials ; Diatoms and Algae Research ; Silk-based biomaterials and applications
Authors: Dounia Mezouar | Rachid Azzi | Fayza Abbou | Faïza Mouderas | Mohammed Aissaoui | Lahfa Farid Boucif
Source: Genetics and Biodiversity Journal (article, 2021-05-15)
Field: Chemistry — Organic Chemistry

Alpha-amylase inhibitory activity and antioxidant effect of Olea var. europaea sylvestris leaves extracts. Evaluation of medicinal plants for their antidiabetic activities has increased considerably around the world as well as in Algeria. Olea europaea var. sylvestris, commonly called Ezzeboudj, is traditionally used by Tlemcen population in Algeria, for treating diabetes mellitus. In this work, we studied the antioxidant activity of wild olive leaves crude extracts, by free radical DPPH scavenging method and iron reduction FRAP. On the other hand, evaluation of the ability of the extracts to inhibit α-amylase activity. The qualitative phytochemical screening carried out on O. europaea var. sylvestris leaves extracts showed the presence of tannins, sterols and triterpenes, saponins, flavonoids and terpenoids. A quantitative analysis of the crude extracts showed significant levels of total polyphenols and flavonoids in hydroacetonic extract, with an amount of 228,45 ± 0,03 mg GAE /g and 204,8 ± 0,04 mg CE /g, respectively. The results obtained from the antioxidant activity showed a high scavenging activity for hydroacetonic extract with an IC50 of 7,95 ± 0,16 µg/ml. In vitro tests carried out on the inhibitory of α-amylase activity, revealed an inhibitory effects, specifically with hydromethanolic extract in a concetration-dependent manner, with an IC50 value of 0,91 ± 0,02 mg/ml. These findings reveals that O. europaea var. sylvestris leaves could represent an interesting source of antioxidants and allow to the development of new antidiabetic agents. Olea ; Polyphenol ; DPPH ; Antioxidant ; Phytochemical ; Traditional medicine ; Chemistry ; Terpenoid ; Terpene ; Food science ; Population ; Alpha-amylase ; Alpha-glucosidase ; IC50 ; Amylase ; Botany ; Biology ; Biochemistry ; Enzyme ; In vitro ; Medicine Edible Oils Quality and Analysis ; Phytochemicals and Antioxidant Activities
Authors: Yunfeng Huang | Y. HUANG | Yingtao Yao | Zikun Zhou | J. Zhang | Sha Yang | Jing Hua Zhou | Shubo Zhou
Source: Applied Ecology and Environmental Research (article, 2021-01-01)
Field: Chemistry — Spectroscopy

ALGAE GROWTH INHIBITION BY AQUEOUS EXTRACTS FROM ALTERNANTHERA PHILOXEROIDES AND UNDERLYING MECHANISMS Using Microcystis aeruginosa as a research receptor, the inhibitory effects of 0.3-1.1 g/L root, stem and leaf extracts from Alternanthera philoxeroides on algae growth and their underlying mechanisms were studied. The biomass, oxygen radical (O2 -), malondialdehyde (MDA), nucleic acid, microcystin and polysaccharide contents were determined and cell morphological and structural variations were observed. Results showed that the extracts from A. philoxeroides significantly inhibited the growth of M. aeruginosa in a concentration-dependent manner. In particular, root extract had the strongest inhibition effect, followed by stem and leaf extract. The growth of more than 80% of all M. aeruginosa was inhibited after 96 h exposure to 1.1 g/L root extract. Besides, the damage degree of cells treated with root extract after 72 h was shown by the scanning electron microscope. With the accumulation of O2 -, the contents of all physiological indicators increased with higher extract concentrations, except for MDA content, which decreased first after 24 h culture at 0.3 g/L treatment. In conclusion, A. philoxeroides had a certain ecological control capacity on M. aeruginosa growth by aggravating oxidative stress, destroying membrane permeability, changing cell structure and finally inducing plasmatorrhexis, but the specific action of allelochemicals it contained remained to be further explored. Alternanthera philoxeroides ; Algae ; Botany ; Aqueous solution ; Chemistry ; Growth inhibition ; Allelopathy ; Biology ; Biochemistry ; Cell growth ; Germination Analytical Chemistry and Chromatography ; Steroid Chemistry and Biochemistry
Authors: Yulia B. Monakhova | Bernd Diehl
Source: Applied Magnetic Resonance (article, 2021-03-27)
Field: Chemistry — Analytical Chemistry

A Step Towards Optimization of the qNMR Workflow: Proficiency Testing Exercise at an GxP-Accredited Laboratory Abstract Quantitative nuclear magnetic resonance (qNMR) is considered as a powerful tool for multicomponent mixture analysis as well as for the purity determination of single compounds. Special attention is currently paid to the training of operators and study directors involved in qNMR testing. To assure that only qualified personnel are used for sample preparation at our GxP-accredited laboratory, weighing test was proposed. Sixteen participants performed six-fold weighing of the binary mixture of dibutylated hydroxytoluene (BHT) and 1,2,4,5-tetrachloro-3-nitrobenzene (TCNB). To evaluate the quality of data analysis, all spectra were evaluated manually by a qNMR expert and using in-house developed automated routine. The results revealed that mean values are comparable and both evaluation approaches are free of systematic error. However, automated evaluation resulted in an approximately 20% increase in precision. The same findings were revealed for qNMR analysis of 32 compounds used in pharmaceutical industry. Weighing test by six-fold determination in binary mixtures and automated qNMR methodology can be recommended as efficient tools for evaluating staff proficiency. The automated qNMR method significantly increases throughput and precision of qNMR for routine measurements and extends application scope of qNMR. Binary number ; Computer science ; Workflow ; Accreditation ; Process engineering ; Chromatography ; Chemistry ; Engineering ; Mathematics ; Database ; Medical education ; Medicine Spectroscopy and Chemometric Analyses ; Analytical Chemistry and Chromatography ; Metabolomics and Mass Spectrometry Studies
Authors: Bingbing Zhang | Kui Wu | Ying Wang | Daqing Yang
Source: Scientia Sinica Chimica (article, 2021-08-05)
Field: Materials Science — Electronic, Optical and Magnetic Materials

The application and development of the first principles calculation in nonlinear optical materials <p indent=0mm>Nonlinear optical (NLO) crystals need to meet multiple criteria, so it is a challenging and time-consuming task to find new NLO materials. The computational method that based on first-principles can screen out materials from a large number of materials by predicting their properties. In addition, the NLO-active groups of the materials can be identified by studying the “composition-structure-properties” relationship, which provides guidance for the synthesis of new materials. This paper summarizes the role and recent cases of computational materials in the discovery of new NLO materials. The first-principles high-throughput screening pipeline system for nonlinear optical materials (FHSP-NLO) is introduced emphatically. The system combines density functional theory (DFT) codes, linear and nonlinear optical property calculation codes, and data transformation and extraction codes, and can be automatically run to calculate and analyze a large number of materials at once. It has been successfully applied in systems including borates, germanates and nitride silicates, which provide a powerful and effective tool for searching new NLO materials. Nonlinear optical ; Nonlinear system ; Computer science ; Pipeline (software) ; Transformation (genetics) ; Property (philosophy) ; Throughput ; Materials science ; Algorithm ; Computational science ; Chemistry ; Physics ; Telecommunications Crystal Structures and Properties ; Nonlinear Optical Materials Research ; X-ray Diffraction in Crystallography
Authors: Valeria Khaimov | Bastian-Jesper Klußmann-Fricke | Sabine Illner | Stefan Siewert | Klaus‐Peter Schmitz
Source: Current Directions in Biomedical Engineering (article, 2021-10-01)
Field: Materials Science — Biomaterials

In vitro biocompatibility testing of polymeric nanofiber scaffolds: fine-tuning for a better prediction of the in vivo behaviour Abstract Biomaterial research efforts focus on the development of biomaterials that mimic the natural extracellular environment. In addition, different strategies are applied to render materials for blood-contacting devices nonthrombogenic through surface modifications that would suppress activation of platelets, coagulation and the complement system. A confluent thin layer of endothelial cells lines all blood vessels and produces factors responsible for inhibition of coagulation, thrombosis and neointimal hyperplasia. Thus, the ability to rapidly form a healthy endothelium upon implantation represents a desired property of biomaterials used for cardiovascular devices. In this study we used advanced in vitro methods to investigate the biocompatibility of a biodegradable and a permanent electrospun nanofiber fabric, poly-L-lactic acid and polycarbonate-based silicone elastomer respectively, with the focus on endothelialization and hemocompatibility. Biocompatibility ; Nanofiber ; Biomedical engineering ; Materials science ; Biomaterial ; In vivo ; Silicone ; Electrospinning ; Nanotechnology ; Polymer ; Composite material ; Medicine Electrospun Nanofibers in Biomedical Applications ; Bone Tissue Engineering Materials ; Advanced Sensor and Energy Harvesting Materials
Authors: R.S. Rehna | Deepak Nand
Source: AIP conference proceedings (article, 2021-01-01)
Field: Materials Science — Materials Chemistry

Size and shape controlled seed mediated biosynthesis of silver nanoparticles Seed mediated routes for synthesis of nano particles are of much importance today as it enables fine tuning of the size and shape of the synthesized nanoparticles. Herein we have synthesized silver nanoparticles via seed mediated procedure using green synthesis method. This is done by chemical reduction of AgNO3 with Oxalis corniculata leaf broth. The morphology and optical properties of the particles were investigated using FESEM, AFM and UV- visible absorption spectroscopy. The crystallinity of the as prepared samples were analyzed using XRD. The SERS activities of these samples as substrates were tested with crystal violet molecule and are described in detail. Crystallinity ; Silver nanoparticle ; Nanoparticle ; Materials science ; Crystal violet ; Morphology (biology) ; Absorption (acoustics) ; Chemical engineering ; Absorption spectroscopy ; Nanotechnology ; Molecule ; Crystal (programming language) ; Ultraviolet visible spectroscopy ; Spectroscopy ; Nuclear chemistry ; Chemistry ; Organic chemistry ; Optics ; Composite material ; Microbiology Nanoparticles: synthesis and applications ; Gold and Silver Nanoparticles Synthesis and Applications ; Laser-Ablation Synthesis of Nanoparticles
Authors: Thi Nga Tran
Source: theses.fr (ABES) (preprint, 2021-03-25)
Field: Chemistry — Organic Chemistry

Thermosensitive and degradable nanogels by RAFT-mediated PITSA in aqueous dispersion Stimuli-sensitive nanogels are three-dimensional hydrogel materials in the nanoscale size range formed by crosslinked polymer networks with a high capacity to swell in water. They are of interest for drug delivery, carriers for imaging probes and genetic materials, for separation processes and for heavy metals removal. The characteristics, such as size, porosity, softness, swelling ratio, surface and degradability, of stimuli-sensitive nanogels based on synthetic polymers can be tuned by finely chosing an appropriate and a versatile synthetic pathway. The reversible addition-fragmentation chain transfer (RAFT) mediated polymerization-induced thermal self-assembly (PITSA) is a powerful way to target thermosensitive nanogels thanks to the tolerance of the radical process and to the formation of self-assembled block copolymers in nano-objets in a one-pot process using aqueous dispersed medium. This work studies the synthesis and characterization of thermosensitive and pH-sensitive core-shell chemically crosslinked nanogels through RAFT-mediated PITSA in aqueous dispersion. The nanogels shell is based on a poly(oligo(ethylene glycol) acrylate) which chemical structure including chain-end has been monitored thanks to soft initiating modes (thermal and UV-light activations) for the RAFT polymerization. Dual-sensitive nanogels cores with a upper critical solution temperature (UCST) based on poly(N-acryloyl glycinamide) or a lower critical solution temperature (LCST) based on poly(N-isopropylacrylamide) combined to a pH-degradable ketal crosslinker were obtained through UV light RAFT-mediated PITSA in aqueous dispersion. By the judicious combination of monomer to RAFT precursor shell initial ratio, of the amount of crosslinker and of the solid content, the size, water content, swelling ratio, degradability and phase transition temperature of nanogels have been fine-tuned. Lower critical solution temperature ; Raft ; Copolymer ; Chain transfer ; Materials science ; Nanogel ; Chemical engineering ; Aqueous solution ; Polymerization ; Polymer chemistry ; Upper critical solution temperature ; Polymer ; Reversible addition−fragmentation chain-transfer polymerization ; Dispersion polymerization ; Ethylene glycol ; Acrylate ; Radical polymerization ; Chemistry ; Drug delivery ; Nanotechnology ; Organic chemistry ; Composite material Advanced Polymer Synthesis and Characterization ; Hydrogels: synthesis, properties, applications ; Photopolymerization techniques and applications
Authors: Sanjeev Kumar | Tanmay Mahanta | T. Mohanty
Source: Bulletin of Materials Science (article, 2021-09-23)
Field: Materials Science — Materials Chemistry

Defect-induced strain-assisted surface electronic response of layered materials Materials science ; Nanomaterials ; Work function ; Nanotechnology ; Smart material ; Fabrication ; Graphene ; Structural material ; Work (physics) ; Electronics ; Composite material ; Mechanical engineering 2D Materials and Applications ; Graphene research and applications ; MXene and MAX Phase Materials
Authors: Tugsuz Tugba
Source: International Journal of Nanomaterials Nanotechnology and Nanomedicine (article, 2021-03-30)
Field: Materials Science — Materials Chemistry

A Theoretical Study on the Optical Spectroscopic Properties of Indigoids@B36 Indigoids represent a family of environmentally friendly organic semiconductor materials. In this study, we aim to fine-tune the optoelectronic properties and semiconductor performance of indigoids by careful choice of the functional groups. Semiconductor ; Materials science ; Organic semiconductor ; Optoelectronics ; Nanotechnology Boron and Carbon Nanomaterials Research ; Machine Learning in Materials Science ; Advanced Thermoelectric Materials and Devices