Mini-dissertation submitted in partial compliance with the requirements of the Master’s Degree in Technology: Homoeopathy in the Faculty of Health Sciences at the Durban University of Technology, 2008. / The aim of this study was to elicit and document the effects, in the form of signs and symptoms produced in relatively healthy volunteers, of the venom of Hemachatus haemachatus, prepared in accordance with the methods set out in the homoeopathic pharmacopoeia. These signs and symptoms form the indications for the prescription of the remedy, according to the homoeopathic Law of Similars. A further aim of this study was a comparative analysis of symptoms produced by Hemachatus haemachatus 30ch with existing remedies derived from snake venom used in homeopathy, with the aim of highlighting the similarities and differences between them. The homoeopathic drug proving of Hemachatus haemachatus 30ch took the form of a double-blind, placebo controlled trial. The proving population consisted of 30 healthy subjects who met with the necessary inclusion criteria (Appendix B). Eighty percent (24 subjects) served as the experimental group, receiving the active verum in a randomised manner, while twenty percent (6 subjects) formed the placebo group, receiving non-medicated placebo powders in a randomised manner. Provers were unaware of either the nature or potency of the substance. Verum and placebo were indistinguishable from each other, and neither researcher nor volunteers knew who received verum and who received placebo. Intra-individual control was achieved through a pre-proving observation period of a week’s duration, during which provers recorded the signs and symptoms of their normal state. This symptom picture served as a baseline for comparison with symptoms noted after administration of the remedy. Verum and placebo were dispensed in the form of six powders to be taken sublingually three times a day for a period of two days, or until the onset of symptoms. Data was primarily collected in the form of a diary or journal kept by each prover in which they recorded symptoms on a daily basis. Provers were closely monitored by the researchers during this period. Data collected by the researchers during daily telephonic contacts, as well as during the pre-proving consultation, was also considered. Information obtained from the journals was then assessed by the researchers for suitability for inclusion in the materia medica of Hemachatus haemachatus. The data did not require statistical analysis. In a concurrent study of similar methodology, Cahill (2008) conducted a comparison of the symptom complex produced in the proving of Hemachatus haemachatus, with other homeopathic remedies which scored highest on repertorisation. Symptoms from both studies were collated and included in the materia medica and repertory of Hemachatus haemachatus. The investigation supported the hypothesis that Hemachatus haemachatus would produce clear and observable signs and symptoms in healthy proving volunteers. During the course of this study provers experienced a wide range of mental, emotional and physical symptoms. The highest number of symptoms was produced on the mental and emotional level. Provers experienced elation, joy, increased confidence, enthusiasm and energy. On the other hand, there was lack of confidence, vulnerability, anxiety, decreased motivation, decreased concentration, lethargy, depression and indifference. There were sudden changes in mood and provers experienced marked irritability. On the physical level, many provers experienced headaches, irritation of the eyes, symptoms resembling allergic rhinitis, sore throats, nausea, heartburn, abdominal pain and flatulence, menstrual disturbances, lumbar pain, rheumatic joint pains, and skin eruptions. There were disturbances in normal sleep patterns, subjective perceptions of increased body temperature with hot flushes, and generalised tiredness and lethargy. Symptoms obtained from the proving of Hemachatus haemachatus were analysed as part of a comparative study with other remedies derived from snake venom: Lachesis muta, Naja tripudians, Elaps corallinus, Naja mossambica and Bitis arietans arietans. This comparison highlighted both the similarities and differences between these remedies and Hemachatus haemachatus.

Guía de Laboratorio del curso Química General (MA212) para la carrera de nutrición. Consta de 4 prácticas de laboratorio: cambios de la materia, soluciones, cinética química y medida de pH.

Aprender química requiere no solo de la asimilación de conceptos teóricos, sino también de adquirir habilidades de desarrollo analítico. Para consolidar los conceptos teóricos se ha preparado una serie de ejercicios que el profesor desarrollará en clase. Al final de cada unidad, hemos preparado ejercicios integradores que le permitirá al alumno recordar y aplicar los conceptos fundamentales de cada unidad desarrollada. Te aconsejamos que, antes de desarrollar los ejercicios, revises los aspectos teóricos de cada unidad. El curso de química proporciona los conceptos básicos de la Química General y Química Orgánica enmarcados dentro de los principios de conservación del medio ambiente.

Guía de laboratorio del curso Química General (MA212) para la carrera de nutrición. Consta de 6 prácticas de laboratorio: operaciones básicas de laboratorio, cambios de la materia, estequimetría, soluciones, cinética química y medida de pH.

Cuaderno de trabajo del curso Nivelación de Química (MA 228), que corresponde al ciclo 2013-2. Se inicia con el estudio de la materia, su transformación y culmina con las soluciones acuosas y la determinación de pH. En cada tema se presentan actividades, las cuales deberán ser realizadas por el alumno durante las sesiones de clase y con el apoyo del facilitador.

Guía de laboratorio del curso Química General (MA212) para la carrera de nutrición. Consta de 6 prácticas de laboratorio: operaciones básicas de laboratorio, cambios de la materia, estequimetría, soluciones, cinética química y medida de pH.

Poly(N-isopropylacrylamide), [poly(NIPAM)], is a thermosensitive polymer which undergoes a conformational transition at approximately 32°C in aqueous solution. NIPAM is a monomer commonly employed in microgel synthesis and the resultant particles are thermosensitive, a property which can be altered by modification of the system by co-polymerisation. A series of colloidal microgels have been prepared by surfactant-free emulsion polymerisation (SFEP) based on the NIPAM monomer. Butyl acrylate (BuAc) has been used as a co-monomer in order to alter the physico-chemical properties of poly(NIPAM) microgel particles. Thermosensitive poly(NIPAM/BuAc) homopolymeric/co-polymers microgels have been prepared with various monomer ratios, ranging from pure poly(NIPAM) to pure poly(BuAc), both cross-linked using N', N'-methylenebisacrylamide (BA). The microgel series have been characterised by turbidimetric analysis, dynamic light scattering, electrophoretic mobility measurements and TEM to determine particle size and volume phase transition (VPT) behaviour. The incorporation of BuAc has been found to reduce the volume phase transition temperature (VPPT) of poly(NIPAM). Small-angle neutron scattering (SANS) has been employed as a structural probe to interrogate the internal particle structure of co-polymer microgel particles prepared in a one pot reaction. The structure, with respect to monomer distribution, has been investigated by contrast matching SANS, using both deuteriated and non-deuteriated microgel particles. Co-polymer microgels prepared using NIPAM and BuAc, synthesised by SFEP in a one-pot reaction, were found to possess a structure comprising of regions rich in BuAc appearing as defined clusters within the gel like network.

Mid Infrared spectroscopy coupled with multivariate Target Factor Analysis (TFA) was used to investigate permeation and localisation of drugs through and within synthetic membranes and human skin. Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectroscopy was used for the diffusion experiments, and Mid-IR mapping for the drug distribution studies in human skin. A proof of concept was established through these studies, for a rapid screening protocol of membranes in general. Mid-IR reference spectra of the compounds were systematically collected to form a library for subsequent data interpretation. Reproducibility studies using a solution of methyl paraben (MP) in ethanol (EtOH) and water through Carbosil and polydimethylsiloxane (PDMS) or silicone were conducted. Carbosil membrane is more complex membrane than PDMS as it has a heterophase domain structure composed of PDMS and polycarbonate (PC). It was found that an extremely good contact between the membrane and the ATR crystal was essential in order to obtain good reproducibility. Carbosil had an excellent contact and thus good reproducibility was obtained, whereas the opposite was found for the type of silicone membrane used. Also, the power of TFA to deconvolute very similar compounds such as MP and propyl paraben (PP), within a same data set, was successfully demonstrated. Diffusion experiments on a series of model drug compounds, i.e. methyl paraben (MP), ibuprofen (IBU) and caffeine (CF) in water and ethanol were studied through a synthetic membrane and human skin. The spectral data collected were complex, and were therefore, analysed by multivariate TFA. The data were successfully deconvoluted obtaining, in most of the cases, a high correlation between the deconvoluted factors from the data and the reference spectra of the compounds of interest. then evolution profiles for the diffusion of the species with time for the drug, and solvents were obtained for Carbosil as well as for skin, even though in the case of the skin the data were still more complex. A commercial formulation of IBU was also examined using human skin. Again most of the components were successfully deconvoluted and evolution profiles were obtained. Finally, Mid IR and TFA was used to localise a lipophilic drug within the layers of human skin. The distribution and localisation of the drug in the skin layers was successfully studied by adopting a multivariate analysis approach based on TFA. The compound was successfully localised and the greatest relative concentration was observed within hair follicles as expected. The ensemble of these experiments demonstrates that IR spectroscopy coupled with TFA is a valuable tool for the study of membranes, particularly skin. It also opens up a novel approach to high throughput screening in formulation development.

Four endemic medicinal plants from the Yucatan peninsula belonging to genera with little pharmacological and phytochemical reported information and used for medicinal purposes by local communities were selected. The species selected included Jacquinia flammea Millsp. ex Mez, Sideroxylon foetidissimum Jacq. subsp. gaumeri, Serjania yucatanensis Standl., and Serjania adiantoides Radlk. The root, stem/bank and leaves of each plant species were extracted using ethanol and the resulting crude extracts were tested for their cytotoxic effect using the modified MTT (3-[4,5-Dimethylthiazol-2-yl]-2,5-diphenyl-tetrazolium bromide) assay followed by a bioassay-guided fractionation of the most active extracts in order to identify the active metabolites. The initial cytotoxic evaluation against HeLa cells at two fixed concentrations (100 and 33.3 µg/mL) identified the root extracts f J. flammea, S. foetidissimum subsp. gaumeri and S. yucatanensis, and the stem/bank extract of S. adiantoides as the most active extracts. The crude extract of roots of J. flammea was subjected to solvent partition using solvents of ascending polarity (pet. ether, CHCI3, EtOAc, BuOH and water). The resulting fractions were tested for their cytotoxic activity. The water fraction of the solvent partition showed the strongest activity against HeLa cells (IC50 = 28.61 ± 2.27 µg/mL). When tested against RAW 264.7 cells, the water fraction also showed significant activity (IC50 = 10.60 ± 1.83 µg/mL). The water fraction was subjected to chromatographic fractionation using open silica gel columns resulting in the isolation of a saponin as the most active metabolite against RAW 264.7 cells (IC50 = 4.76 ± 0.32 µg/mL). The isolated compound was identified using 1D (1H and 13C and DEPT-135) and 2D (COSY, HMBC, HSQC and NOESY and ROESY) NMR and mass spectrometry analysis as sakurasosaponin. The molluscicidal and antifungal activities of sakurasosaponin have been reported but no studies on its cytotoxic activity have been previously reported. The crude extract of roots of S. foetidissimum subsp. gaumeri was subjected to solvent partition using solvents of ascending polarity (pet. ether, CHC13, EtOAc, and BuOH). The resulting fractions were tested for their cytotoxic activity. The BuOH extract of S. foetidissimum subsp. gaumeri showed the strongest activity against RAW 264.7 cells (IC50 = 35.12 ± 4.32 µg/mL) and it was subjected to further chromatographic fractionation using open silica gel columns yielding mixtures of saponin-containing fractions. The crude extract of roots of S. yucatanensis was subjected to solvent partition using solvents of ascending polarity (pet. ether, CHCI3, EtOAc, and BuOH). The resulting fractions were tested for their cytotoxic activity. The crude extract of S. adiantoiodes did not show cytotoxic activity when tested against RAW 264.7 cells.

Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2008. / Includes bibliographical references (leaves 215-232). Also available in electronic version.