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 44 for “"petals"”.
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Petals, pigments and pollinator preferences
As the world population rises, we will need to grow more food. Insect pollination is essential or beneficial for ~75% of crops, including most fruit, nuts, and commodity crops such as coffee and cocoa, yet there is evidence of significant global decline in insect numbers: this conflict is central …
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Mechanisms controlling cell shape patterning in petals
… often exhibit various patterns on their petals. These patterns allow entomophilous plants to attract pollinators and also help them deal with abiotic stress such as UV-levels and water loss. While previous research largely focused on pigmentation patterns, structural patterns created by …
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Polarity establishment and signalling mechanisms controlling patterning in Hibiscus Trionum petals
… and pigments combine with each other to pattern petals surfaces and these patterns can mediate plant-animal communication. Hibiscus trionum flowers produce a striking bullseye pattern by specifying cells with different pigmentation, shape, and texture in different regions of the adaxial petal …
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Grip, slip, petals, and pollinators: Linking the biomechanics, behaviour and ecology of interactions between bees and plants
… was also explored. Although the majority of petals do have a rough surface, some have slippery petals. In the field, bumblebees avoided landing on slippery hollyhock petals in favour of the easy-to-grip staminal column. In contrast, honey bees, which are smaller and have larger adhesive pads, …
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Neo-colonial elitism and its influence in Kenya: A case study of Ngugi wa Thiong'o's petals of blood, Devil on the cross and Matigari
… influence in Kenya in his postcolonial novels, Petals of Blood (1977), Devil on the Cross (1982a) and Matigari (1989). The study employed a content analysis approach where the three novels were read and studied in depth before emerging themes, relating to neo-colonial elitism in Kenya, were …
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Contributions to the systematics of the genus Schizochilus
… three-cleft lip; and free, erect sepals and petals, all three sepals being equal and the petals much smaller than the sepals. The type species, S. zeyheri Sond., is described as having a small number (2-3) of linear-oblong basal leaves and a spike of 16-20 small flowers. Sepals and petals are …
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'n Ondersoek na die invloed van 8-hidroksikinoliensulfaat en n-6-bensielaminopurien op enkele aspekte van veroudering by angelierblomme
… A higher water content is maintained in the petals, especially during the climacteric and post climacteric stages. The most efficient preservative is the BAP/HQS mixture. There are no noticeable changes in the pattern of respiration and the duration of the preclimacteric period in presence of …
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Graphene Decorated Substrates and Their Interfacial Characteristics
… nitrogen-doped graphene and graphitic nanopetals.</p> <p>Integrating carbon-based structures with each other is another area which is yet to be fully addressed. Interfaces play an important role in such integration. Seamlessly</p> <p>integrating different structures together with minimum …
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Drying of colloidal suspension drops : pattern formation and mechanical deformation
… cracks separate the deposit into a multitude of petals. Due to the negative water pressure inside the pores of the deposit, these petals bend upwards creating mesmerizing forms reminiscent of blooming flowers.
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Synthesis Of Graphene Nanomaterials And Their Application In Electrochemical Energy Storage
… the formation and structure of graphitic petals grown by microwave plasma-enhanced chemical vapor deposition on oxidized silicon substrates were investigated through process variation and materials analysis. Insights gained into the growth mechanism of these graphitic petals suggest a …
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FACTORS INFLUENCING A PETAL-BASED FORECASTING SYSTEM FOR SCLEROTINIA STEM ROT OF CANOLA
… relationship between the percentage of canola petals infested with Sclerotinia sclerotiorum and the incidence of sclerotinia stem rot: canopy density; diurnal and other weather mediated fluctuations in petal infestation; and long-term changes in infestation during flowering. Disease incidence …
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An experimental investigation of coloring matter in Canna Indica flowers
… was done by extracting the pigment from flower petals with methanol, amyl alcohol, and other solvents, and crystallizing the pigment as a salt. Physical properties such as solubility, color reactions, spectra and others were examined for this pigment. Chemical properties and degradation products …
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Fantasia Nirvana
… two themes: the petal, and a shower of flower petals. The composer chooses to represent her vision about the Sutra.
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On the molecular pathways supporting the development of structurally coloured cuticle in Hibiscus trionum
… of the proximal adaxial part of Hibiscus trionum petals revealed the presence of structural colours. They are mainly characterised by the specific reflection of blue and UV-light in an angle dependant manner (also known as iridescence). Further observations of the cuticle showed the presence of …
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An analysis of the land issue as portrayed in selected novels by Ngugi wa Thiong'o
… Between (1965), A Grain of Wheat (1967), and Petals of Blood (1977), analyzing how Ngugi uses form to present land as a bone of contention between white settlers and Africans in Kenya and paying particular attention to how land appropriation affected African culture and tradition. It is hoped …
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Laser Electrospray Mass Spectrometry: Mechanistic Insights and Classification of Inorganic-Based Explosives and Tissue Phenotypes Using Multivariate Statistics
… of eight phenotypes of Impatiens plant flower petals after mass analysis with LEMS. The PCA loading values were used to identify the key biomarkers in the classification. These important mass spectral features were identified as the biologically-relevant anthocyanins, which are phytochemicals …
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Mechanisms of bullseye boundary formation in Hibiscus trionum petal patterning
… proximodistal cell differentiation in H. trionum petals. Next, I investigated epidermis cell behaviour during bullseye pattern boundary formation. Before visible pattern features emerge, the largest cells are found at the one-third position from the petal base, possibly marking the future bullseye …
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The structure of 4-separations in 4-connected matroids
… terms of the local connectivity between pairs of petals. Specializing to the case of 4-connected matroids, we give a new notion of equivalence of 4-separations that we show will be needed to describe a tree decomposition for 4-connected matroids. Finally, we characterize all internally 4-connected …
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Pengaruh ketinggian tempat tumbuh rosella dan jenis bahan rosella terhadap aktivitas antioksidan Teh Kombucha Rosella
… of materials include the type of fresh roselle petals and dry type. Roselle petals are obtained fermented with kombucha culture obtained from kombucha employers. Parameter is observed antioxidant activity of Kombucha tea set with Rosella UV Vis spectrophotometer using DPPH reagent. The data …
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Role of subfunctionalized MYB paralogs in the evolution of pigmentation patterning in Clarkia
… and widely varied pigmentation patterns on their petals while other species in the family have for the most part unpigmented and unpatterned petals, suggesting that pigmentation patterning first evolved at the origin of the Clarkia genus and then has diversified in extant species. In addition, the …
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