Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 110 for “"Dichloromethane"”.
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In Vitro tests for immunomodulatory effects of medicinal plants used in the treatment of Malaria in South Africa
… cytotoxic effect of the aqueous, methanol and dichloromethane extracts of these plants was evaluated in vitro in Rat-1 fibroblasts there was no observable difference in cytotoxic activity between cold-and hot-water extracts of all the plants investigated. Cell proliferation greater than 80% was …
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Feasibility Analysis of Estrification Systems with Entrainers
… products in esterification production systems. Dichloromethane and trichloromethane are the entrainers that are very toxic, yet still conventionally used for production of those esters mentioned above. In this paper, n-hexane and n-pentane are introduced as alternative entrainers because these …
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ΔΙΕΡΕΥΝΗΣΗ ΜΕ ΤΗΝ ΥΓΡΟΧΡΩΜΑΤΟΓΡΑΦΙΑ ΥΨΗΛΗΣ ΠΙΕΣΗΣ ΤΗΣ ΣΥΓΚΕΝΤΡΩΣΗΣ ΤΗΣ ΦΟΥΡΑΖΟΛΙΔΟΝΗΣ ΣΤΑ ΑΥΓΑ ΟΡΝΙΘΩΝ ΣΕ ΣΧΕΣΗ ΜΕ ΤΗΝ ΠΟΣΟΤΗΤΑ ΤΗΣ ΟΤΑΝ ...
… SAMPLE IS ACIDIFIED AT PH 4 AND EXTRACTED WITH DICHLOROMETHANE. THE EXTRACT IS CLARIFIED BY TREATMENT WITH ACETONE AT -78 C AND THEN BY PARTITIONING BETWEEN HEXANE AND WATER. FURAZOLIDONE IS EXTRACTED FROM THE EQUEOUS PHASE WITH DICHLOROMETHANE AND THEN IS CHROMATOGRAPHED ON A C8 COLUMN WITH A …
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Synthesis and Characterization of Surface-Functionalized Magnetic Polylactide Nanospheres
… and these complexes were dispersible in dichloromethane. The polylactide tailblocks extended into the dichloromethane and provided steric repulsion between the magnetite-polymer complexes. The resultant magnetite-polymer complexes were further incorporated into controlled-size …
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Isolation of Natural Products from Casearia nigrescens
… the structure of the isolated compounds. The dichloromethane fraction of Casearia nigrescens was weakly active in the A2780 human ovarian cancer cell line bioassay. Further separation of the dichloromethane fraction resulted in the isolation of five known compounds (casearlucin A, caseamenbrol …
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Studies on Solid-Phase Peptide Synthesis: The Synthesis of Glucagon
… by treatment with 0.5% trifluoracetic acid in dichloromethane. Deprotection of most of the side-chain protecting groups as well as cleavage of the peptide from the resin at the end of the synthesis was accomplished through treatment of the protected peptide resin with 50% TFA in dichloromethane …
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Cobalamin-Enhanced Anaerobic Biotransformation of Carbon Tetrachloride
… culture-Acetobacterium woodii (ATCC-29683), a dichloromethane degrading enrichment culture, and a methanol enrichment culture were studied for this purpose.
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Synthesis and Characterization of Polylactide-siloxane Block Copolymers as Magnetite Nanoparticle Dispersion Stabilizers
… surfaces and these complexes were dispersible in dichloromethane. The poly(L-lactide) tailblocks extended into the dichloromethane and provided steric repulsion between the magnetite-polymer complexes.
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Thermal and chemical analysis of carbonaceous materials: diesel soot and diesel fuel reactor deposits
… methanol and acetone) were compared with dichloromethane, the most extensively used solvent for the extraction of soot with respect to their ability to extract a variety of species, including polyaromatic hydrocarbons (PAHs) and potential endocrine disrupting molecules, e.g. phthalates. …
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Design and operation of microchemical systems for multistep chemical syntheses
… flows of hexane and water, toluene and water, dichloromethane and water, and hexane and methanol. Integrated liquid-liquid extraction devices are microfabricated that performed two -phase contacting by segmented flow, followed by separation - resulting in single stage extraction. Single stage …
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Cytotoxic, anti-inflammatory, antibacterial and anti-HIV effects of tabernaemontana elegans leaves and fractions
… powder using a miller. Three solvents (hexane, dichloromethane and methanol) were used to successively extract compounds of different polarities. Column chromatography was used to isolated compounds from the dichloromethane and methanol extracts. Qualitative phytochemical and antioxidant (DPPH) …
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Antiplasmodial/Antipyretic activity of some Zulu medicinal plants
… of each plant were separately extracted v into dichloromethane, methanol and water solvents. Larvicidal activity against Culex quinquefascitus larvae was determined by incubating the larvae with the plant extracts for 24 hours, where after percentage mortality was calculated. The antioxidant …
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Phytochemical and toxocological studies of some Botswanan plants used in traditional medicine
… neither phytochemically nor toxicologically. Dichloromethane, methanol and water extracts of each of the plants were tested for cytotoxicity against a panel of four cell lines - three human and one murine cell line. While all extracts exhibited some degree of cytotoxicity, extracts from A. …
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Studies in the anionic polymerization of methyl methacrylate
… amounts of cyclohexane, tetrahydrofuran or dichloromethane. Experiments at low solvent polarity (using toluene/cyclohexane mixtures) showed problems with initiator solubility but produced polymer with lower polydispersity and higher syndiotacticity than in toluene alone. Experiments using …
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Synthesis and X-ray Diffraction Structures of 2-(2-thienylidene)-4,5-bis-(diphenylphosphino)-4-cyclopenten-1,3-dione and fac-BrRe(CO)3[2-(2-thienylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione]
… dione with thiophene carboxyaldehyde in dichloromethane, in the presence of molecular sieves results in a new heterocyclic compound, 2-(2-thienylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (ligand), with a high yield. This product was characterized by using both IR and NMR …
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Spectroscopic Studies of Chlorophyll a Complexes with Trinitro-Substituted Flourene Derivatives
… These systems were studied in acetonitrile and dichloromethane at room temperature. Absorption data were analyzed with the Nash plot. Linearity of the Nash plots proved that a 1:1 complex was formed between the donor and acceptor. Ground state binding constants (Ka) of each system were also …
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Polymer-supported reagents for disinfection of water
… combined active Cl. The resin was extracted with dichloromethane and examined for total organic carbon and by GC/MS and HPLC.
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Adsorption and dechlorination of chlorophenols under acidogenic conditions
… pentachlorophenol (PCP). CCl4 was degraded to dichloromethane without the need for acclimation. Dechlorination of 2,4,6-TCP to 4-chlorophenol under acidogenic conditions was only successfully induced by manipulating the start-up procedure of the acidogenic sequencing batch reactor. PCP and …
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Part I : Total synthesis and biological evaluation of antillatoxin and fragments Part II: Synthetic studies towards the total synthesis of cytochalasans and tuberostemonine
… molecules using BF3.OEt2 as the Lewis acid in dichloromethane at -78 A?C to -60 A?C.
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