Search

Your search keyword '"Ravi, G."' showing total 127 results
Start Over Author "Ravi, G." Publisher springer science and business media llc
127 results on '"Ravi, G."'

4. Correction to: First-line nivolumab plus ipilimumab in metastatic non-small cell lung cancer: 5-year outcomes in Japanese patients from CheckMate 227 Part 1

Author

Nishio, Makoto, primary, Ohe, Yuichiro, additional, Ikeda, Satoshi, additional, Yokoyama, Toshihide, additional, Hayashi, Hidetoshi, additional, Fukuhara, Tatsuro, additional, Sato, Yuki, additional, Tanaka, Hiroshi, additional, Hotta, Katsuyuki, additional, Sugawara, Shunichi, additional, Daga, Haruko, additional, Okamoto, Isamu, additional, Kasahara, Kazuo, additional, Naito, Tateaki, additional, Li, Li, additional, Gupta, Ravi G., additional, Bushong, Judith, additional, and Mizutani, Hideaki, additional

Published
2023
Full Text
View/download PDF

5. First-line nivolumab plus ipilimumab in metastatic non-small cell lung cancer: 5-year outcomes in Japanese patients from CheckMate 227 Part 1

Author

Nishio, Makoto, primary, Ohe, Yuichiro, additional, Ikeda, Satoshi, additional, Yokoyama, Toshihide, additional, Hayashi, Hidetoshi, additional, Fukuhara, Tatsuro, additional, Sato, Yuki, additional, Tanaka, Hiroshi, additional, Hotta, Katsuyuki, additional, Sugawara, Shunichi, additional, Daga, Haruko, additional, Okamoto, Isamu, additional, Kasahara, Kazuo, additional, Naito, Tateaki, additional, Li, Li, additional, Gupta, Ravi G., additional, Bushong, Judith, additional, and Mizutani, Hideaki, additional

Published
2023
Full Text
View/download PDF

7. Nanolatex technology 1: synthesis and characterization of nanosize acrylic latexes and comparison to their conventional size counterparts

Author

Ravi G. Joshi, Frank N. Jones, Weidian Shen, and Theodore Provder

Subjects
chemistry.chemical_classification, Gloss (annotation), Materials science, technology, industry, and agriculture, Emulsion polymerization, macromolecular substances, Surfaces and Interfaces, General Chemistry, Polymer, Dynamic mechanical analysis, Surfaces, Coatings and Films, Colloid and Surface Chemistry, Differential scanning calorimetry, chemistry, Chemical engineering, Copolymer, Microemulsion, Particle size
Abstract

For this study, functional precoalescence (internally crosslinked) and postcoalescence (crosslinkable) conventional latexes were made using seeded semi-continuous emulsion polymerization. Nanosize polymer latexes with or without crosslinkable functional groups were made using a modified microemulsion copolymerization process. Films cast from conventional and nanosize latex were characterized using specific end use tests and fundamental properties using dynamic mechanical analysis, modulated differential scanning calorimetry, and atomic force microscopy. This study compares conventional and nanosize latex with respect to the effect of the type and level of crosslinking, particle size and distribution on latex film formation and morphology, and end use and fundamental properties. Nanosize latex films in general have superior gloss, solvent resistance, and adhesion but inferior water resistance. Stress–strain Young’s modulus showed an increase as a function of increasing crosslinker level in the nanosize latex films.

Published
2021

9. Nanolatex technology 2: blending polymer nanoparticles with conventional latexes for synergistic property improvement

Author

Frank N. Jones, Ravi G. Joshi, Theodore Provder, and Weidian Shen

Subjects
chemistry.chemical_classification, Gloss (annotation), Materials science, Nanoparticle, 02 engineering and technology, Surfaces and Interfaces, General Chemistry, Polymer, Dynamic mechanical analysis, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, chemistry.chemical_compound, Colloid and Surface Chemistry, Differential scanning calorimetry, Monomer, chemistry, Chemical engineering, Nano, Copolymer, 0210 nano-technology
Abstract

Results of our research on crosslinked latexes and polymer nanoparticles will be reported. Goals of this long-term program have been: comparing precoalescence and post-coalescence crosslinking; synthesizing polymer nanoparticle latexes (~ 20 to 25 nm) from a variety of acrylic monomers, including crosslinking and crosslinkable monomers; and blending nanoparticle latexes with compatible conventional (~ 120 to 130 nm) latexes and understanding their effects on film formation and on fundamental and empirical film properties. As we previously reported, blending conventional and nanolatexes in an 85/15 ratio (w/w of polymer solids) effects substantial changes of fundamental film properties. Best results included reducing minimum filming temperatures (MFT) while increasing Young’s moduli by factors of two to 17. Substantial improvements in empirical film properties such as gloss (up to 97 at 60°), hardness (increased by 2–5 pencils), block resistance, and adhesion to aluminum were also found. The previous report covered only a single blend ratio. Here we report studies of blends with ratios of conventional to nanoparticle latexes ranging from 92.5/7.5 to 30/70 (w/w). As before, the latexes and nanolatexes are BMA/BA copolymers with 0–4 wt.% of 1,3-butylene glycol dimethacrylate (precoalescence crosslinker) and 0–5 wt.% of diacetone acrylamide (for post-coalescence crosslinking with adipic dihydrazide). Films cast from these blends are subjected to everyday empirical coatings tests and are characterized using instrumental tests including dynamic mechanical analysis (DMA) and modulated differential scanning calorimetry (MDSC). Film formation and film morphology are studied using atomic force microscopy (AFM). The results confirm that blending nanoparticles at ratios up to 50/50 (w/w of polymer solids) can substantially improve certain properties of conventional latex films. For many properties, the optimum ratio is around 85/15 conventional/nano; a 92.5/7.5 ratio also affords substantial improvements. As coatings, the blends have near-zero VOC.

Published
2021

27. Cobalt-based derivatives oxygen evolution reaction

Author

Swathi, S., primary, Rani, B. Jansi, additional, Yuvakkumar, R., additional, Ravi, G., additional, Babu, E. Sunil, additional, Pannipara, Mehboobali, additional, Al-Sehemi, Abdullah G., additional, and Velauthapillai, Dhayalan, additional

Published
2021
Full Text
View/download PDF

30. Development and Investigation of Vitamin C-Enriched Adapalene-Loaded Transfersome Gel: a Collegial Approach for the Treatment of Acne Vulgaris

Author

Shaila A. Lewis, Vivek M. Ghate, Sally A. El-Zahaby, Sandhya Vasanth, Ravi G S, Srinivas Hebbar, and Akhilesh Dubey

Subjects
Vitamin, Dispersity, Pharmaceutical Science, 02 engineering and technology, Aquatic Science, 030226 pharmacology & pharmacy, Transfersome, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, Adapalene, Drug Discovery, Zeta potential, medicine, Ecology, Evolution, Behavior and Systematics, Chromatography, Ecology, Vesicle, General Medicine, Penetration (firestop), 021001 nanoscience & nanotechnology, chemistry, Particle size, 0210 nano-technology, Agronomy and Crop Science, medicine.drug
Abstract

Adapalene-loaded transfersome gel containing vitamin C as a combination therapy for the management of acne vulgaris was developed in the present study. The transfersome was prepared by reverse-phase evaporation, and the effect of various process parameters were investigated by the Design of Experiment (DOE) approach and optimized based on the particle size (PS), polydispersity index (PDI), zeta potential (ZP), and entrapment efficiency (EE). The selected tranfersomes were further evaluated for their thermal behavior and morphology by transmission electron microscopy and turbidity measurements and incorporated into a gel with/without vitamin C. The gel was evaluated and compared with the marketed product (Adiff gel) for various physicochemical parameters, and in vivo studies in testosterone-induced rat models of acne. The prepared transfersomes had PS in the range of 280 to 400 nm, PDI values of 0.416 to 0.8, ZP of − 38 to − 20 mV, and % EE of 32 to 70%. DSC studies confirmed a positive interaction of the components in the transfersome. Surface morphology confirmed that the vesicles were spherical, unilamellar, and discrete. A relative deformability study showed higher elasticity of the transfersomes compared with Adiff aqs gel. Ascorbyl-6-palmitate in adapalene-loaded transfersome gel containing vitamin C (ADVTG) was found to have a good antioxidant free radical–scavenging activity. An in vitro drug release study showed that the sustained release of the transfersomal formulations was attributed to the flexibility of the vesicles by which penetration was increased. ADVTG was found to be promising in treating acne compared with the marketed product.

Published
2020

31. Energy Storage Applications of CdMoO4 Microspheres

Author

Isacfranklin, M., primary, Yuvakkumar, R., additional, Ravi, G., additional, Babu, E. Sunil, additional, Velauthapillai, Dhayalan, additional, Thambidurai, M., additional, Dang, Cuong, additional, Algarni, Tahani Saad, additional, and Al-Mohaimeed, Amal M., additional

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results