A5045838478- Phytochemistry and Bioactive Compounds
- Phytochemical Studies and Bioactivities
- Marine Sponges and Natural Products
- Natural product bioactivities and synthesis
- Phytochemistry and Biological Activities
- Cancer Treatment and Pharmacology
- Sesquiterpenes and Asteraceae Studies
- Traditional and Medicinal Uses of Annonaceae
- Plant biochemistry and biosynthesis
- Carbohydrate Chemistry and Synthesis
- Plant Toxicity and Pharmacological Properties
- Chemical synthesis and alkaloids
- Essential Oils and Antimicrobial Activity
- Bioactive Natural Diterpenoids Research
- Phytochemical compounds biological activities
- Pharmacological Effects of Natural Compounds
- Biological Activity of Diterpenoids and Biflavonoids
- Steroid Chemistry and Biochemistry
- Synthetic Organic Chemistry Methods
- Phytochemistry and Bioactivity Studies
- Botanical Research and Chemistry
- Natural Antidiabetic Agents Studies
- Plant-based Medicinal Research
- Cynara cardunculus studies
- Garlic and Onion Studies
Royal Berkshire NHS Foundation Trust
2024
Australian National University
2023-2024
Galgotias University
2024
Queensland University of Technology
2022
The University of Queensland
2018-2022
International Center for Chemical and Biological Sciences
2011-2020
University of Karachi
2011-2020
ORCID
2020
Macquarie University
2015
Government College University, Lahore
2014
Lapachol is a naphthoquinone that was first isolated by E. Paterno from Tabebuia avellanedae (Bignoniaceae) in 1882.A wide spectrum of therapeutic activities have been attributed to lapachol or its derivatives viz., anti-abscess, anti-ulcer, antileishmanial, anticarcinomic, antiedemic,
Abstract Methylammonium (MA)‐free perovskite solar cells have the potential for better thermal stability than their MA‐containing counterparts. However, efficiency of MA‐free lags behind due to inferior bulk quality. In this work, 4‐methylphenethylammonium chloride (4M‐PEACl) is added into a precursor, which results in greatly enhanced The crystal grains are significantly enlarged, and defects suppressed by factor four upon incorporation an optimal concentration 4M‐PEACl. Quasi‐2D...
This research work was executed to determine chemical composition, anti-oxidant and anti-microbial potential of the essential oils extracted from leaves stem Daphne mucronata Royle. From fifty-one different constituents were identified through GC/MS examination. The antioxidant evaluated DPPH free radical scavenging activity %-inhibition peroxidation in linoleic acid system. stem's oil showed good as compared oil. Results Antimicrobial revealed that both strong against Candida albicans with...
Abstract Recent studies have demonstrated that in thermally activated delayed fluorescence (TADF) materials, efficient reverse intersystem crossing occurs from nonradiative triplet exited states to radiative singlet excited due a small singlet–triplet energy gap. This significantly influences exciton annihilation processes and external quantum efficiency roll‐off TADF based organic light‐emitting diodes (OLEDs). In this work, comprehensive quenching model is developed for system determine...
Chemical investigation of the fungal strain Microdiplodia sp. isolated from shrub Lycium intricatum led to isolation four new compounds: a hexahydroxanthone (2), 2,3-dihydrochroman-4-one (3), 7-oxoxanthone derivative (4), and 1,4-oxazepan-7-one (5). The relative configurations compounds were determined by intensive NMR investigations, notably NOESY experiments at different temperatures. absolute well-known metabolite diversonol (1) other xanthone derivatives (3, 4) established means TDDFT...
Abstract Electrical pumping of organic semiconductor devices involves charge injection, transport, device on/off dynamics, exciton formation and annihilation processes. A comprehensive model analysing those entwined processes together is most helpful in determining the dominating loss pathways. In this paper, we report experimental theoretical results Super Yellow (Poly( p -phenylene vinylene) co-polymer) light emitting diodes operating at high current density under voltage nanosecond...
Triplet excitons have been identified as the major obstacle to realisation of organic laser diodes, accumulation triplet leads significant losses under continuous wave (CW) operation and/or electrical excitation. Here, we report design and synthesis a solid-state quencher, well in-depth studies its dispersion into solution processable bis-stilbene-based dye. By blending dye with 20 wt% negligible effects on ASE thresholds, but complete suppression singlet-triplet annihilation (STA) 20-fold...
Abstract Significant progress has recently been made in the field of organic solid-state lasers. However, achieving lasing action from semiconductors under electrical excitation remains challenging due to losses introduced by triplet excitons. Here, we report experimental and theoretical results that confirm a positive contribution excitons for electrically-driven via bimolecular triplet-triplet upconversion (TTU) mechanism. We study model fluorescent material,...
This study demonstrates the transformative impact of incorporating poly(vinylidene fluoride-co-trifluoroethylene) P(VDF-TRFE) as an additive in hole transport layer (HTL) 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (Spiro-OMeTAD). The forms resilient coordination bonds with 4-tert-butylpyridine (TBP) and lithium bis(trifluoromethanesulfonyl)imide additives, which mitigates TBP evaporation improves Spiro-OMeTAD film quality. In addition, we observed improvements...
The ability to extract material parameters of perovskite from quantitative experimental analysis is essential for rational design photovoltaic and optoelectronic applications. However, the difficulty this increases significantly with complexity theoretical model number perovskite. Here we use Bayesian optimization develop an platform that can up 8 fundamental organometallic semiconductor a transient photoluminescence experiment, based on complex full physics includes drift-diffusion carriers...
A controlled amount of excess lead iodide (PbI2) in the perovskite precursor has been widely used solar cells (PSCs) to enhance device's performance by passivating defects. However,...
Abstract During the present study, ethanol extracts of five seaweed species Solieria robusta, Iyengaria stellata, Colpomenia sinuosa, Spatoglossum asperum and Caulerpa racemosa at 10 mg/ 200 g body weight were tested for their hypolipidaemic activity. All significantly decreased serum total cholesterol, triglyceride low density lipoprotein cholesterol levels in normal, triton‐induced diet‐induced hyperlipidaemic rats. robusta was found to be most effective reducing lipid profile,...
A new guaianolide, taraxacin (1), and a known sesquiterpene ketolactone (2) have been isolated from an ethyl acetate-soluble part of methanolic extract Taraxacum wallichii. The structure 1 was established using NMR, MS, X-ray crystallographic methods. (13)C NMR data 2 is also being reported for the first time.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkaloids from the Leaves of Prosopis julifloraViqar Uddin Ahmad, Azra Sultana, and Sabiha QaziCite this: J. Nat. Prod. 1989, 52, 3, 497–501Publication Date (Print):May 1, 1989Publication History Published online1 July 2004Published inissue 1 May 1989https://pubs.acs.org/doi/10.1021/np50063a005https://doi.org/10.1021/np50063a005research-articleACS PublicationsRequest reuse permissionsArticle Views437Altmetric-Citations31LEARN ABOUT THESE...
Syntheses of thirty 2,4,6-trichlorophenylhydrazine Schiff bases 1-30 were carried out and evaluated for their in vitro DPPH radical super oxide anion scavenging activities. Compounds have shown a varying degree activity IC50 values range between 4.05-369.30 µM. The compounds 17, 28, 18, 14, 8, 15, 12, 2, 29, 7 exhibited ranging 4.05 ± 0.06-24.42 0.86 µM which are superior to standard n-propylgallate (IC50 = 30.12 0.27 µM). Selected superoxide scavenger 91.23-406.90 28 showed 91.23 1.2-105.31...