Browsing Research Articles (Chemistry and Polymer Science) by Title
Now showing items 1-20 of 77
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1-tert-Butyl 2-ethyl 5-bromo-3-(thiophen-2-ylcarbonyl)-1H-indole-1,2-dicarboxylate
(International Union of Crystallography, 2013-01-16)ENGLISH ABSTRACT: In the title compound, C21H20BrNO5S, the thiophene group is located above the mean plane of the indole ring and displays rotational disorder (i.e. rotation through 180). The site occupancy of the major ... -
4-Benzyloxylonchocarpin and muracatanes A-C from Ranunculus muricatus L. and their biological effects
(MDPI, 2020-11-17)ENGLISH ABSTRACT: Ranunculus muricatus L. is a spiny fruit buttercup that is used in various traditional medicinal systems. In the current investigation of R. muricatus, the new chalcone 4-benzyloxylonchocarpin (1), the ... -
Acrolein dimer as a marker for direct detection of acrolein in wine
(South African Society for Enology and Viticulture, 2012)Acrolein is highly toxic and its presence in wine has been correlated with the development of bitterness. Analytical detection and quantification in aqueous solutions are challenging due to high reactivity and problems ... -
Advantages of scanning probe microscopy in polymer science
(Academy of Science for South Africa, 2004)We introduce the atomic force microscope (AFM) and its capabilities with special regard to its use in polymer science. It shows several advantages over other analytical techniques, such as scanning electron microscopy, ... -
Alkaloids with activity against the Zika virus vector Aedes aegypti (L.) - crinsarnine and sarniensinol, two new crinine and mesembrine type alkaloids isolated from the South African Plant Nerine sarniensis
(MDPI, 2016-10-27)Two new Amaryllidaceae alkaloids, belonging to the mesembrine- and crinine-types, named crinsarnine (1) and sarniensinol (2), were isolated from the dried bulbs of Nerine sarniensis together with bowdensine (3), sarniensine ... -
Analysis of gamma-ray and neutron-induced chromosome aberrations in CHO-K1 cells using the atomic force microscope
(Academy of Science for South Africa, 2004)THE ENUMERATION OF CHROMOSOME aberrations remains a popular method to relate DNA damage to radiation dose delivered, and is the basis of efforts to improve aberration assays. In the work reported here, atomic force microscopy ... -
Antibacterial properties of tough and strong electrospun PMMA/PEO fiber mats filled with lanasol : a naturally occurring brominated substance
(MDPI, 2014-09-09)A new type of antimicrobial, biocompatible and toughness enhanced ultra-thin fiber mats for biomedical applications is presented. The tough and porous fiber mats were obtained by electrospinning solution-blended poly (methyl ... -
Asikliese karbeenkomplekse maak eerste opslae in goudstormloop
(LitNet Academic, 2012-12)OPSOMMING: Die eerste karbeenkomplekse van goud is reeds in 1971 deur Bonati en Minghetti gerapporteer. Verdere ontwikkelings na die 1980’s was stadig. Sedert 2007, toe die belangstelling in goudchemie reeds geweldig ... -
AuII : skaars of afgeskeep? 'n Kritiese literatuuroorsig
(LitNet, 2016-06-17)AFRIKAANSE OPSOMMING: Verbindings van AuII is reeds langer as 60 jaar bekend. ’n Literatuurstudie toon dat slegs ’n beperkte aantal struktuur- en bindingstipes tot dusver in suiwer vorm geïsoleer en gekarakteriseer kon ... -
Avian exocrine secretions. I : chemical characterization of the volatile action of the uropygial secretion of the green woodhoopoe, Phoeniculus purpureus
(Springer Verlag, 2004-08)Using gas chromatography–mass spectrometry in conjunction with auxiliary techniques such as solid phase microextraction and determination of double bond positions by means of dimethyl disulfide derivatization, 45 ... -
Butenolides from plant-derived smoke : natural plant-growth regulators with antagonistic actions on seed germination
(American Chemical Society and American Society of Pharmacognosy, 2010-01)Smoke plays an intriguing role in promoting the germination of seeds of many species following a fire. Recently, a bicyclic compound containing a condensed butenolide moiety, 3-methyl-2H-furo[2,3-c]pyran-2-one (1), was ... -
A calix[4]arene based boronic acid catalyst for amide bond formation : proof of principle study
(ARKAT USA, 2018-06-25)ENGLISH ABSTRACT: A calix[4]arene boronic acid was synthesized and tested for catalysis in amide formation. The results were positive and paved the way for future designs, even though protodeboronation was observed under ... -
Cation–π induced aggregation of water-soluble [PtII(diimine)(Ln-S,O)]+ complexes studied by ¹H DOSY NMR and TEM : from ‘dimer aggregates’ in acetonitrile to nano-aggregates (‘metallogels’) in water
(Royal Society of Chemistry, 2013)See PDF file for an abstract. -
Characterization of volatiles and aroma-active compounds in honeybush (Cyclopia subternata) by GC-MS and GC-O analysis
(American Chemical Society, 2012-03)Volatile organic compounds (VOCs) in fermented honeybush, Cyclopia subternata, were sampled by means of a high-capacity headspace sample enrichment probe (SEP) and analyzed by gas chromatography-mass spectrometry (GC-MS). ... -
Chemical characterization of territorial marking fluid of male Bengal tiger, Panthera tigris
(Springer Verlag, 2008-05)The territorial marking fluid of the male Bengal tiger, Panthera tigris, consists of a mixture of urine and a small quantity of lipid material that may act as a controlled-release carrier for the volatile constituents of ... -
Chemical characterization of the constituents of the aroma of honeybush, Cyclopia genistoides
(Elsevier, 2008-01)A high-capacity headspace sample enrichment probe (SEP) was used in conjunction with gas chromatography-mass spectrometry (GC-MS) to analyse the volatile organic compounds present in the aroma of dry or infused, unfermented ... -
Chemical constituents isolated from Lycium shawii and their chemotaxonomic significance
(ACG Publications, 2017-11-15)ENGLISH ABSTRACT: Phytochemical investigation of Lycium shawii Roem. & Schult provided fourteen compounds, including lyciumate (1), dehydrocostus lactone (2), costunolide (3), catechin (4), lyciumaside (5), emodin (6), ... -
A comparative study of regenerated bamboo, cotton and viscose rayon fabrics. Part 1 : Selected comfort properties
(South African Association of Family Ecology and Consumer Sciences (SAAFECS), 2010)ENGLISH ABSTRACT: Regenerated bamboo, also known as bamboo viscose, is a man-made cellulose fibre that has recently appeared on the market as an apparel and home-furnishing textile. The products are marketed as having ... -
Computational investigation of Au...H hydrogen bonds involving neutral AuI N-heterocyclic carbene complexes and amphiprotic binary hydrides
(Springer, 2019-04-26)In this computational study we investigate the ability of various neutral R-AuI-NHC (NHC = N-heterocyclic carbene) complexes [R = H, CH3, Cl, OH] to form hydrogen bonds with the amphiprotic binary hydrides NH3, H2O and HF. ... -
Coordinated autophagy modulation overcomes glioblastoma chemoresistance through disruption of mitochondrial bioenergetics
(Nature Research, 2018-07-09)Glioblastoma Multiforme (GBM) is known to be one of the most malignant and aggressive forms of brain cancer due to its resistance to chemotherapy. Recently, GBM was found to not only utilise both oxidative phosphorylation ...
