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Changes in the molecular weight distribution of DNA sheared in a virtis homogenizerHurliman, Eva Winter, 1941- January 1965 (has links)
No description available.
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Biochemical taxonomy by DNA analysisEssop, M Faadiel 19 October 2022 (has links) (PDF)
Defining how closely related a pair or a group of organisms are, is necessary both for the construction of phylogenetic trees, which constitutes the academic science of systematics, and for making practical conservation management decisions, as for example, whether it would result in deleterous genetic consequences (decreased fitness on reproductive capability) if two closely related animals e.g. blesbok, Damaliscus dorcas phillipsi, and bontebok, Damaliscus dorcas dorcas, were allowed to interbreed, in which case active steps would be required to manage the animals in an appropriate way. Reliance on traditional morphological characters to answer such questions are difficult because morphological characters change at a rate which is very poorly correlated with time, whereas the genetic differences which affect management decisions change at a progressive and generally linear rate with time (Wilson et al., 1977). In order, therefore, to try and measure such genetic differences in a more quantitative way, biologists turned to biochemical methods (two to three decades ago) and initially studied differences in protein allozymes, with considerable success (reviewed in Chapter 1). Over the last few years attention has switched to use of differences at the level of DNA, since this is the most direct biochemical measure of genetic variation, being the material of which genes are made (Wilson et al., 1977). Organelle DNA from mitochondria in animals has been widely used since it has a number of advantages compared to nuclear DNA, and is the DNA used in the studies reported here. Mitochondrial DNA accumulates single base point mutations with time, at a rate about 5 to 10 times faster than in nuclear DNA (Brown et al., 1979), which renders it the DNA of choice for comparisons between sub-species, species or genera. This project set out to establish modern biochemical methods of comparative DNA analysis and to apply these to local animal groups and so obtain objective data of both academic interest and of practical value to nature conservation problems. The major academic results are the construction of a molecular phylogeny for a major proportion of the Southern African Bovidae (Chapter 3). The family Bovidae has been one of the most difficult mammalian families to classify and there is no general agreement concerning its classification (Ansell, 1971b). Mt DNA restriction analyses were performed on 14 Southern African bovids and restriction maps constructed independently for all 14 species. Phylogenetic trees were constructed by using both distance and cladistic methods. Cladograms supported a sister status of the impala relative to the Alcelaphini and Connochaetini. Four members of the Tragelaphini remained an unresolved quadrichotomy and this would be consistent with inclusion of the eland within Tragelaphus. Distance dendograms would be consistent with a major radiation at the tribal level at the end of the Miocene. Answers to questions of specific conservation interest have been obtained with respect to several animals where conservation management requires knowledge as to how closely related certain pairs or groups of animals are. The answers relate to: ( 1) bontebok, Damaliscus dorcas dorcas vs blesbok, Damaliscus dorcas phillipsi ( Chapter 4); ( 2) African wild cat, Felis lybica vs domestic cat, Felis catus (Chapter 5) and (3) Kruger vs Addo elephant (Chapter 6). A specific request of Nature conservation authorities was to define the genetic relationship between the bontebok and the blesbok, which has conservation management relevance. The sequence divergence between the blesbok and bontebok confirmed that there is no justification in terms of genetic distance alone for applying separate specific status to the bontebok and the blesbok, but would be an appropriate value consistent with maintaining their present subspecific designation. Another request of Nature conservation authorities was to define the genetic relationship between the African wild cat and the domestic cat, since interbreeding between the two takes place where the range of the African wild cat border on those areas inhabited by man, which might effectively cause the disappearance of F.lybica (Smithers, 1983). Mt DNA restriction maps were constructed for the domestic cat, African wild cat and the European wild cat, Felis sylvestris, which was also included in our analysis. The domestic cat and African wild cat were found to have identical restriction maps emphasizing their close relationship. The domestic cat and African wild cat are therefore likely to have no preferences against inbreeding and the chances of the wild cat phenotype therefore being lost by dilution into the domestic cat is high. The sequence divergence between the African wild cat and European wild cat on the other hand, suggests that the common ancestral mt DNA of these cats existed about 650 000 years ago, indicating a more recent descent than was previously thought. A further request from conservation managers was to show the genetic difference, if any, between the Knysna and Kruger elephant herds. Mt DNA fragment size comparisons were performed on 9 elephants from the Kruger National Park and 5 elephants from the Addo Elephant National Park. All the restriction patterns found in the Addo population could be found in the Kruger population. The Addo population's results was extrapolated to the Knysna population. Therefore, genetically the Knysna population would represent a subset of the larger Kruger population. There is therefore no support from the mitochondrial studies for the Knysna and the Kruger elephant populations to be considered as different subspecies.
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A comparative analysis of monkeypox and variola virus DNACowley, Roy January 1989 (has links)
No description available.
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The analysis and prediction of DNA structureBasham, Beth E. 11 March 1998 (has links)
As genome sequencing projects begin to come to completion, the
challenge becomes one of determining how to understand the information
contained within the DNA. DNA is a polymorphic macromolecule; the A- B-
and Z-DNA conformations have been observed by a variety of physical
techniques. The magnitude of the energetic differences between these
conformations suggests that these conformations may be important
biologically and thus relevant in the analysis of genomes. A computer
program, NASTE, was developed to evaluate the helical parameters of the
set of Z-DNA crystal structures in order to determine the true conformation
of Z-DNA and to understand the effects of various factors on the observed
structure and stability. A thermodynamic method, elucidated in part with a
genetic algorithm, was developed to predict the sequence-dependent
propensity of DNA sequences for A- versus B-DNA in both the crystal and
in natural DNA. Predictions from this method were tested by studying the
conformation of short oligonucleotides using circular dichroism
spectroscopy. Finally, the thermodynamic method was applied in an
algorithm, AHUNT, to identify regions in genomic DNA with a high
propensity to form A-DNA. Significant amounts of A-DNA were identified
in eukaryotic and archeabacterial genes. E. coli genes have less A-DNA
than would be predicted from their (G+C) content. These results are
discussed with respect to the intracellular environment of the genomes. / Graduation date: 1998
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A comparison of DIG nonradioactive with 32p radioactive nucleic acid labeling of Southern blot for the detection of alpha thalassaemiaTang, Yeuk-nam, Kennie., 鄧若楠. January 2005 (has links)
published_or_final_version / Medical Sciences / Master / Master of Medical Sciences
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Rapid and direct DNA extraction from saliva for personalized medicineYung, Hoi-chu., 翁海珠. January 2010 (has links)
published_or_final_version / Pathology / Master / Master of Medical Sciences
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Quantitation of mismatched regions in DNA heteroduplexes: lambda phage DNA as a model systemMcCarthy, James Joseph, 1947- January 1974 (has links)
No description available.
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The determination of DNA content per cell in some species of Nicotiana and CucurbitaKeener, Sherry Lynn, 1948- January 1975 (has links)
No description available.
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Minor groove hydration and conformation in A-tract DNAWoods, Kristen Kruger 08 1900 (has links)
No description available.
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A 1.3Å crystal structure analysis of the sequence [d(CGCGAATTCGCG)]₂ containing cesium ionsKerzic, Melissa Corinne 12 1900 (has links)
No description available.
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