Thesis--University of Michigan. / Reprinted from the American naturalist, vol. LXXX ... March, 1946. Literature cited: p. 269-270.

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The aim of this study was to influence stress ethylene level of Dendrathema grandiflorum cv. Sunny euro by bacterium Enterobacter cloaceae Cal2, because senescence and abscission are the most common cause of quality loss of cut flowers and lowering of ethylene level can reduce these two processes and provide longer life cut flowers.

Swallow, Egg, Chrysanthemum is a sixteen minute work for piano and orchestra. The title refers to symbols from Greek, Western and Asian cultures, with all of the symbols being associated with life, death, or resurrection. Over the course of the piece the interaction of the piano with the orchestra creates a metaphor for the journey of the human soul through the three states of existence. Each of the three contiguous movements carries the name of one of the symbols, whose physical aspects influence the internal form of the movement. In recognition of the conflict between an acceptance of life and death, and a belief in life, death and resurrection, the work contains coexisting two- and three- part forms. At the temporal level, “Swallow” is balanced by “Egg” and “Chrysanthemum”, and this balance is aided by a blurring of the boundary between the last two movements. The musical language of the work is based in part on the use of cyclical, diminishing permutations of pitch collections, which are themselves derived from a master pitch group. The permutations reduce the number of pitches in each collection, creating an apparent “zeroing in” on a single pitch or “tonic goal”. As a result, moving backwards or forwards through the reductive process can increase or decrease the musical tension of a particular passage, by altering the number of pitches present. Twelve harmonic areas are created using this technique, and over the course of the work each of them is touched upon, with certain ones being of greater importance. Foreshadowing has been used in the form of the work as a unifying device and is present at the micro and macro levels. The form of the Introduction can be mapped onto the first two movements, and onto the piece as a whole. In the last movement a process of postshadowing occurs, whereby earlier material is reinterpreted and transformed in a summation of the work.

A chemotaxonomic identification of the herbal remedy Chrysanthemum parthenium (feverfew) and its reported adulterants Chrysanthemum vulgaris (tansy) and Chamomile vulgaris (German chamomile) has been undertaken. An initial survey investigated the distribution of phenolic compounds in the plants using a RP-HPLC diode-array system. A chemometric analysis of the data distinguished feverfew from its adulterant German chamomile, though tansy was ambiguous. In the light of these findings, the GLC of essential oils and in particular the reported active ingredient parthenolide, were used as alternative fingerprinting markers. Conventional extraction techniques were investigated but were considered unsuitable. Supercritical fluid extraction (SFE) was extensively examined and successfully yielded the claimed active ingredient. The determination of the essential oil content of the plants enabled feverfew to be unambiguously identified from both adulterants. The technique was sufficiently sensitive to assign authenticity to feverfew products. During this study a detailed investigation was made of the SFE conditions required to give complete extraction and recovery of the terpenes from a model matrix and from the plant material.

Swallow, Egg, Chrysanthemum is a sixteen minute work for piano and orchestra. The title refers to symbols from Greek, Western and Asian cultures, with all of the symbols being associated with life, death, or resurrection. Over the course of the piece the interaction of the piano with the orchestra creates a metaphor for the journey of the human soul through the three states of existence. Each of the three contiguous movements carries the name of one of the symbols, whose physical aspects influence the internal form of the movement. In recognition of the conflict between an acceptance of life and death, and a belief in life, death and resurrection, the work contains coexisting two- and three- part forms. At the temporal level, “Swallow” is balanced by “Egg” and “Chrysanthemum”, and this balance is aided by a blurring of the boundary between the last two movements. The musical language of the work is based in part on the use of cyclical, diminishing permutations of pitch collections, which are themselves derived from a master pitch group. The permutations reduce the number of pitches in each collection, creating an apparent “zeroing in” on a single pitch or “tonic goal”. As a result, moving backwards or forwards through the reductive process can increase or decrease the musical tension of a particular passage, by altering the number of pitches present. Twelve harmonic areas are created using this technique, and over the course of the work each of them is touched upon, with certain ones being of greater importance. Foreshadowing has been used in the form of the work as a unifying device and is present at the micro and macro levels. The form of the Introduction can be mapped onto the first two movements, and onto the piece as a whole. In the last movement a process of postshadowing occurs, whereby earlier material is reinterpreted and transformed in a summation of the work. / Arts, Faculty of / Music, School of / Graduate

The potential of increasing disease problems through the use of recycled irrigation water in horticultural operations is a serious concern, yet basic research on waterborne plant pathogens in Virginia is lacking. In this work seasonal fluctuations and locations of Pythiaceae in a recycled water irrigation system at a container nursery were determined. <i>Pythium</i> spp. were recovered more frequently and in greater numbers than <i>Phytophthora</i> spp. Species of <i>Phytophthora</i> recovered in filtering assays were identified as <i>P. capsici, P. citricola, P. citrophthora, P. cryptogea, P. drechsleri,</i> and <i>P. nicotianae. P. cryptogea</i> and <i>P. drechsleri</i> were the only <i>Phytophthora</i> spp. recovered from baits placed on the surface of the irrigation reservoir, whereas a greater diversity of species was recovered from baits placed at depths. Hymexazol-amended medium was found to have limitations in recovery of <i>Phytophthora</i> spp. In pathogenicity tests, <i>P. cactorum, P. capsici, P. citrophthora,</i> and <i>P. nicotianae</i> caused significant mortality of <i>Salvia officinalis</i> and <i>P. cactorum</i> showed limited pathogenicity on <i>Gerbera jamesonii</i>. Asymptomatic (aboveground) plants were found to harbor inoculum long after <i>Phytophthora</i>-inoculation. Fresh weight analyses of roots and shoots of asymptomatic plants demonstrated that <i>Phytophthora</i> inoculation may either reduce or stimulate plant shoot growth, but little effect is apparent on roots. Irrigation with naturally infested irrigation water reduced plant growth. This research provides data for prioritizing development of detection technology and management practices for plant pathogens in irrigation water. The results may also lead to improvements in conventional water assay protocols for plant pathogens. / Master of Science

As atividades que envolvem a floricultura vêm se destacando positivamente no cenário econômico do agronegócio brasileiro. Dentre as espécies de plantas utilizadas para este fim ressaltam-se as espécies pertencentes à família botânica Asteraceae, principalmente as do gênero Chrysanthemum. A espécie C. cinerariaefolium Vis. (Piretro da Dalmácia) é mundialmente cultivada visando à produção de aleloquímicos que apresentam atividades de inseticidas naturais (piretrinas). No Brasil chegou a ser produzida para esse fim em larga escala, no município de Taquara-RS na década de 30 a 40. Recentemente o interesse de seu cultivo tem aumentado como uma alternativa natural de manejo de pragas como planta ornamental, principalmente para jardins. Contudo, o fato de não produzir sementes férteis limita sua capacidade de propagação massal. Visando aperfeiçoar sua micropropagação foram realizados dois experimentos. No experimento 1 foi avaliado aos 30 dias de cultivo a influência de cinco concentrações de hipoclorito de sódio (10, 20, 30, 40 e 50% do produto comercial Mazzarolo) e cinco tempos de permanência na solução durante a desinfestação dos explantes (5, 10, 15, 20, 25 min.). Ao todo foram isolados 125 meristemas totalizando 25 tratamentos com cinco repetições. Os explantes isolados foram inoculados no meio de isolamento, o qual foi constituído de MS + 1,0 mg.L-1 de BAP + 0,1 mg.L-1 de GA3 + 0,01 mg.L-1 ANA + 30 g.L-1 de Sacarose em 7,0 g.L-1 de Agar. No experimento 2 foi avaliado a influência das diferentes concentrações de hipoclorito e dois tempos de permanência na solução desinfetante sobre a porcentagem de necrose, estruturas amorfas, plântulas formadas e comprimento de brotos. As plântulas regeneradas do experimento 1 foram inoculadas no meio de multiplicação que constou do MS + 0,4 mg.L-1 de Thiamina HCl + 100 mg.L-1 de Mio-Inositol + 0,05 mg.L-1 de ANA + 1,0 mg.L-1 de BAP + 40 g.L-1 de Sacarose e 7,0 g.L-1 de Agar. O pH dos meios foi ajustado em 5,9 antes da autoclavagem. Os resultados obtidos no experimento 1 indicaram que quanto maior o tempo de permanência na solução, maior a porcentagem de necrose. Porém, quanto menor a permanência maior a taxa de contaminação microbiana. No experimento 2, observou-se que a porcentagem de necrose é maior na concentração de 50%. Não houve influência dos fatores analisados na produção de estruturas amorfas. Para o número de brotos/explante e comprimento de brotos, o melhor desempenho se deu na solução 30%. Porém, a taxa de brotos por explante diminuiu à medida que aumentou o tempo de permanência na solução. Com relação ao comprimento dos brotos, os melhores resultados foram observados até o tempo de 15 minutos de permanência. Assim conclui-se que C. cinerariaefolium Vis. responde positivamente ao cultivo in vitro. A taxa de necrose aumenta à medida que aumenta a concentração de hipoclorito. Por outro lado, a taxa de contaminação aumenta à medida que diminui a concentração da solução desinfetante. A concentração de hipoclorito de sódio e o tempo de permanência na solução desinfetante afetam o número e o comprimento de brotos produzidos nos subcultivos. / The activities that involve floriculture have distinguished positively in the economic scenario of the Brazilian agribusiness. Among the plant species used for that purpose it can be distinguished the species belonging to the botanical family Asteraceae, mainly from the genus Chrysanthemum. The species C. cinerariaefolium Vis. is worldwide cultivated in order to produce the alelochemicals, which have activities of natural insecticides (pyretrine). In Brazil it was produced in large scale, in the Taquara-RS County in the decade of 30 to 40. Recently the interest on its cultivation has increased as natural alternative of pest management as ornamental plant, mainly in yards. However, the fact of no seed is produced by the plant that limits its capacity of massal production. In order to optimize its micropropagation two experiments were developed. In the experiment 1 it was evaluated 30 days after cultivation the influence of five concentrations of sodium hipochlorine (10, 20, 30, 40 and 50% of the commercial product Mazzarolo), and five time lengths of the explants permanence in the disinfecting solution (5, 10, 15, 20 and 25 min.). It was isolated 125 meristems, 25 treatments with five replications. The isolated explants were inoculated in isolation media, that was constituted of MS + 1.0 mg.mL-1 of BAP + 0.1 mg.L-1 of GA3 + 0.01 mg.L-1 ANA + 30 g.L- 1 of sucrose in 7.0 g.L-1 of Agar. In the experiment 2 it was evaluated the influence of different concentrations of hipochlorine and two length of time in disinfection solution measuring the percentage of necrosis, amorphous structures, seedlings formed and length of the sprouts. The regenerated seedlings from experiment 1 were inoculate in a medium of multiplication that was of MS + 0.4 mg.L-1 of Thiamine HCl + 100 mg.L-1 of Mio-Inositol 0.05 mg.L-1 of ANA + 1.0 mg.L-1 of BAP + 40 g.L-1 of sucrose and 7.0 g.L-1 of Agar. The pH of the medium was adjusted to 5.9 before the autoclaving process. The results obtained in the experiment 1 indicated that the higher the time length in the solution, the higher is the percentage of necrosis. However, the higher is the permanence of higher rate of microbial contamination. In the experiment 2; it was observed that the percentage of necrosis is higher at the concentration of 50%. There was no influence of the analyzed factors in the yield of amorphous structures. For the number of sprouts/explants and length of sprouts, the better performance was in the solution of 30%. However, the rate of sprouts per explants diminished as the length of time in the solution increased. The best results for sprout length were obtained up to 15 minutes of permanence. Therefore, it can be concluded that C. cinerariaefolium Vis. responds positively to in vitro culture. The rate of necrosis increases as the hipochlorine concentration is higher. On the other hand, the contamination rate increases as the disinfection solution diminishes. The concentration o hipochlorine sodium as the length of time of permanence in the initial disinfecting solution used during the explants disinfection affects the number and the sprout length produced during the subculture.

In 2004, lung cancer has been the leading cause of cancer death in Taiwan. Many studies demonstrate that vitamin A plays a crucial role in the prevention of lung cancer. However, few epidemiologic studies have examined the association of dietary vitamin A/precursors and lung cancer in Taiwan. Therefore, a case-control study was conducted to investigate the relationship between the consumption of local common foods that are rich in vitamin A/precursors and the risk of lung cancer. The cases were 301 newly diagnosed patients with histopathologically confirmed primary lung cancer. Two control groups were recruited: 602 hospital controls and 602 neighborhood controls. The consumption of 13 food items and vitamin supplements was estimated with the use of a structured food-frequency questionnaire in face-to-face interviews. Adjusted odds ratios (AOR) and the corresponding 95% confidence intervals (CI) were evaluated with controlling for potential confounders, using the conditional logistic regression model. It was found that reduced risk for lung cancer was associated with increased intakes of vitamin A, a-carotene, or b-carotene from various food groups except fruits. However, inverse associations were not observed for vitamin A, a-carotene, or b-carotene intake from various food items, except garland chrysanthemum and sweet potato leaves. On the other hand, retinol intake from food groups or items was not correlated with lung cancer development. Additionally, more servings of vegetables (AOR for the highest versus the lowest quartile = 0.67-0.70, 95% CI = 0.42-1.08, plinear trend = 0.04), garland chrysanthemum (AOR for the highest versus the lowest tertile = 0.58-0.74, 95% CI = 0.37-1.14, plinear trend = 0.01-0.04) and sweet potato leaves (AOR for the highest versus the lowest tertile = 0.43-0.65, 95% CI = 0.28-0.96, plinear trend &#x00A3; 0.03) were associated with the reduced risk for lung cancer. In conclusion, there were protective effects of dietary intake of vitamin A, a-carotene and b-carotene. The vegetables provided higher potential protection against development of lung cancer than the fruits, especially for garland chrysanthemum and sweet potato leaves. Therefore, our findings suggest that more consumption of garland chrysanthemum and sweet potato leaves might reduce the risk of lung cancer in Taiwan.