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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A comparative study of the phosphodiesterase 4 inhibitory activity of artemisia afra, Leonotis leonorus and mentha longifolia plant medicines.

Mulubwe, Ngosa. January 2007 (has links)
<p>The specific objectives of this study were to investigate whether Artemisia Afra, Leonotis leonorous and Mentha Longiflora have PDE 4 inhibitory activity, to determine and compare the levels of the total phenolic compunds , total and individual flavanoids, especially luteolin and hesperetin, in the three plants and finally, to determine if there was a correlation between the PDE inhibitory activity and the levels of flavanoids or phenolic compounds in the plants. It was hypothesized that the plants with higher levels of total flavonoid and/or aglycone luteolin and/or hesperetin had higher PDE inhibitory activity.</p>
2

Effects of Leonotis leonorus aqueous extract on the isolated perfused rat heart.

Khan, Fatima. January 2007 (has links)
<p>&quot / An aqueous extract prepared from the leaves and smaller stems of Leonotis leonorus was used to investigate the potential effects on certain cardiovascular parameters such as left ventricular systonic pressure, end-diastolic pressure, developed pressure, heart rate, cardiac work and coronary perfusion pressure in isolated rat hearts...&quot / </p>
3

A comparative study of antibacterial activities of wild and cultivated plants used in ethnoveterinary medicine

Luseba, D, Letsoalo, ME, Katerere 05 November 2010 (has links)
Farmers generally collect fresh plant materials from the wild for ethnoveterinary uses. They are encouraged to harvest with caution and dry or cultivate important materials in order to protect the biodiversity. These recommendations are not validated scientifically. The microplate method for minimum inhibitory concentration (MIC) determination was used to compare wild with cultivated, and fresh with dry plant materials. The MIC values obtained ranged from 1.25 to 0.01 mg/ml. MIC values ≤0.3 mg/ml were considered as cut off point between effective and none effective inhibition. The multilevel linear models (hierarchical linear models), both unadjusted and adjusted models were employed. The plant (name) was considered as level-2 or higher level, while the actual observation was level-1 or lower level. The crude estimates of the odds ratio indicated that wild is significantly 0.57 times less likely than garden to yield MIC values of more than 0.3 mg/ml (p-value = 0.005). Also, fresh are about 4.195 times more likely than dry to yield MIC scores of more than 0.3 mg/ml (p-value < 0.001). Adjusting for conditions “dry and fresh”, microbe and solvent; wild is significantly 0.52 times less likely than garden to yield MIC values of more than 0.3 mg/ml (p-value = 0.003). On the other hand, when adjusting for “wild or garden”, type of solvents and type of microbes; fresh is significantly 4.202 times more likely than dry to yield MIC values of more than 0.3 mg/ml (p-value < 0.001). These results partially support farmers claiming that wild plant materials are more potent than the grown ones. On the contrary, the results are in favour of drying plant materials.
4

Studies on some biologically active natural products from Tulbaghia Alliacea.

Maoela, Manki Sarah January 2005 (has links)
It is believed that early humans had knowledge of how to use traditional medicinal plants, but the knowledge has been partially lost as society underwent various changes leading to new civilizations. The aim of this study was to isolate and identify natural product constituents from Tulbaghia Alliacea. There has not yet been any scientifically conducted investigation on the plant. Tulbaghia Alliacea is used for fever and colds, asthma, pulmonary tuberculosis and stomach problems.
5

Effects of Leonotis leonorus aqueous extract on the isolated perfused rat heart.

Khan, Fatima. January 2007 (has links)
<p>&quot / An aqueous extract prepared from the leaves and smaller stems of Leonotis leonorus was used to investigate the potential effects on certain cardiovascular parameters such as left ventricular systonic pressure, end-diastolic pressure, developed pressure, heart rate, cardiac work and coronary perfusion pressure in isolated rat hearts...&quot / </p>
6

A comparative study of the phosphodiesterase 4 inhibitory activity of artemisia afra, Leonotis leonorus and mentha longifolia plant medicines.

Mulubwe, Ngosa. January 2007 (has links)
<p>The specific objectives of this study were to investigate whether Artemisia Afra, Leonotis leonorous and Mentha Longiflora have PDE 4 inhibitory activity, to determine and compare the levels of the total phenolic compunds , total and individual flavanoids, especially luteolin and hesperetin, in the three plants and finally, to determine if there was a correlation between the PDE inhibitory activity and the levels of flavanoids or phenolic compounds in the plants. It was hypothesized that the plants with higher levels of total flavonoid and/or aglycone luteolin and/or hesperetin had higher PDE inhibitory activity.</p>
7

Studies on some biologically active natural products from Tulbaghia Alliacea.

Maoela, Manki Sarah January 2005 (has links)
It is believed that early humans had knowledge of how to use traditional medicinal plants, but the knowledge has been partially lost as society underwent various changes leading to new civilizations. The aim of this study was to isolate and identify natural product constituents from Tulbaghia Alliacea. There has not yet been any scientifically conducted investigation on the plant. Tulbaghia Alliacea is used for fever and colds, asthma, pulmonary tuberculosis and stomach problems.
8

A comparative study of the Phosphodiesterase 4 inhibitory activity of Artemisia Afra, Leonotis Leonorus and mentha longifolia plant medicines. /

Mulubwe, Ngosa. January 2007 (has links) (PDF)
Thesis (MPharm(Department of Pharmacology))--University of the Western Cape, 2007. / Includes Bibliographis references (leaves 79-86).
9

Isolation and identification of anti-inflammatory constituent from Ligusticum chuanxiong and its underlying mechanisms

Or, Cho-tsun. January 2009 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2010. / Includes bibliographical references (leaves 101-110). Also available in print.
10

The ecology of Devil's club (Oplopanax horridum (J.E. Smith) Miq.) in western Oregon /

Roorbach, Ashley H. January 1999 (has links)
Thesis (M.S.)--Oregon State University, 2000. / Typescript (photocopy). Includes mounted photographs. Includes bibliographical references (leaves 76-81). Also available on the World Wide Web.

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