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 23 for “"Fronds"”.
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Ediacaran Fronds from South Australia and Newfoundland
… billion years of mostly microbial evolution. Fronds occupied all tiers of the Ediacaran ecosystem and were the first animals with a construction allowing them to partition the water column macroscopically resulting in a tiering ecosystem similar to Phanerozoic marine ecosystems in structure. …
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Sedimentology of the Catalina Dome and taxonomy of Mistaken Point small fronds
… Aspidella represents the holdfasts of Ediacaran fronds. Stemmed small frond fossils from Mistaken Point, Avalon Peninsula, have often been informally referred to as “featherdusters”, but due to their small size and consequent poor preservation, they have not until now been formally described. The …
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Transcriptional regulation of seasonal desiccation tolerance in the fronds and rhizome of the fern Anemia caffrorum
… availability is high, desiccation sensitive (DS) fronds are produced by the rhizome. In summer, when water availability is low, desiccation tolerant (DT) fronds are produced. Seasonal desiccation tolerance conferred to crops would allow for the maximization of food yields when water is available …
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A proteomic investigation of the rhizomes of the resurrection fern Mohria caffrorum L. (Desv.) in response to desiccation
… in Mohria caffrorum rhizomes. Fronds of this plant have been previously characterized as being desiccation-tolerant in summer and desiccation-sensitive in winter. Since fern rhizomes are perennial organs, it was of interest to establish whether these organs are also perennially …
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Physiological and ecological studies of mannitol utilizing marine bacteria
… Strains isolated from the water column and kelp fronds were classified as Pseudomonas, Vibrio, Acinetobacter and Flavobacterium species. Bacterial diversity in adjacent kelp dominated habitats was examined using numerical analysis, and it was found that nearshore and offshore isolates were …
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STUDIES ON THE ECOLOGY OF HYALE NILSSONI (RATHKE) 1843, AN ALGAL-INHABITING AMPHIPOD CRUSTACEAN
… P. lanosa, with its densely and finely branched fronds, offered greater protection from predictors and desiccation.</p><p>At Nobska Point, although some microhabitat overlap occurred between H. nilssoni and H. plumulosa, the former was most abundant among fronds of F. spiralis, while the latter …
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Structural colour from a helicoidal cellulose architecture in the secondary cell wall: Optical properties, cell wall composition, structure and morphology of components, and their assembly and interactions.
… nobilis}$, an eudicot, and in the fronds of $\textit{Microsorum thailandicum}$, a fern. In this thesis, I studied the optical response and anatomical features of the adaxial and abaxial epidermal layers of cells of $\textit{M. thailandicum}$. The optical variation between fronds, …
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Aspects of growth and production of Laminaria pallida (Grev.) J. Ag. off the Cape Peninsula
… have been investigated. Growth of L. pallida fronds measured as rates of frond elongation was seasonal and showed similar trends at Robben Island and Oudekraal and at different depths. Frond elongation rates of up to 1,3 cm dayˉ¹ were recorded in spring and early summer, whilst slow rates of …
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A study on the behaviour and reproduction of the weedsucker, Eckloniaichthys scylliorhiniceps (Smith, 1943)
… and females lay between 120 and 150 eggs on the fronds of kelp. Reproduction is thought to take place year round. Further work needs to be conducted on predators of weedsuckers, tentatively suggested here to be diving birds (such as Phalacrocorax capensis) and mid-level benthic predators (such as …
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Bird perches and soil amendments as revegetation techniques for landslides in Puerto Rico
… four soil amendments (Cecropia leaves, Cyathea fronds, forest soil, and commercial fertilizer) in five recent (<5 yr) landslides to determine soil and plant responses. Soils were sampled repeatedly over one year to measure soil chemical and physical properties, and I sowed seeds of two common …
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Stress adaptions of the resurrection fern Anemia caffrorum's microbiome and metabolism across seasons
… phenomenon seasonally. In the wet season, its fronds are desiccation sensitive (DS) whilst in the dry season they are desiccation tolerant (DT) and can survive losing more than 95% of their cellular water content. Its rhizome on the other hand is tolerant all year round and likely regulates the …
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Stress adaptions of the resurrection fern Anemia caffrorum's microbiome and metabolism across seasons
… phenomenon seasonally. In the wet season, its fronds are desiccation sensitive (DS) whilst in the dry season they are desiccation tolerant (DT) and can survive losing more than 95% of their cellular water content. Its rhizome on the other hand is tolerant all year round and likely regulates the …
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Cultivation of Palmaria palmata: spore release, vegetative propagation and decontamination techniques.
… A doubling in biomass of whole P. palmata fronds was achieved within four weeks. The at-sea investigation was ineffective due to the time of year as the biomass was heavily fouled with epiphytes. There is potential for this species to be grown commercially if further research takes place to …
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Microplastic adherence to common species of macroalgae found throughout Scottish coastal zones
… samples in addition to sampled Fucus vesiculosus fronds. Additionally, a positive control experiment was created to assess if microplastics adhere to samples of F. vesiculosus. Results found microplastics were present in all collected samples, however no discernible correlation could be made …
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Design of silica-based sustainable biomaterial adsorbents from agricultural waste for the microextraction and adsorptive removal of insecticides and antibiotics from wastewater samples
… by transforming agricultural wastes such as palm fronds, corncobs, and sugarcane bagasse into silica-based magnetic nanocomposites (Fe3O4@SiO2), thereby converting low-value biomass into functional adsorbents while reducing waste disposal burdens. Guided by green chemistry principles, these …
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A precolumn derivatization procedure for the analysis of marine amino acids with 9-fluorenylmethyl chloroformate and high performance liquid chromatography
… acid values. The experiment was set up with kelp fronds in buckets, some containing antibiotics to halt bacterial activity, and a control bucket with untreated seawater. Alanine is the most dominant amino acid (concentration between 5 and 100 nmol.dm⁻³). Values of glycine, aspartic acid, glutamic …
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Studies on the meiofauna of rocky shores
… exposed shores. As the minimum width of Gelidium fronds exceeds that of these permanent meiofauna, and tufts offer little resistance to wave action, only those individuals living in the dense, holdfast region of plants could escape the impact of waves on exposed shores. Total meiofaunal biomass …
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Tropical bracken, a powerful invader of pastures in South Ecuador: Species composition, ecology, control measures, and pasture restoration
… have been abandoned. The density of bracken fronds in a settled bracken area of our research site remained constant over years with small deviations caused by particular weather situations. Since this balance holds also for patchy fern canopies, it is assumed that this is due to nutrient …
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ECOLOGY AND GENECOLOGY OF FUCUS DISTICHUS (L) POWELL
… (width and length of receptacles, width of fronds, etc.) were shown to be of a continuous nature by frequency distribution plots. On the other hand, individuals from different populations were morphologically distinct as judged by population means and analysis of variance. A correlation …
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Role of the biofilm in metals accumulation by fucoid algae and their surrounding rock surfaces
… laboratory study was conducted using adult Fucus fronds to determine if Cu and Zn were accumulated in the biofilm as well as in tissue. Fucus was collected from a coastal site in Kittery, Maine and brought to the Jackson Estuarine Laboratory (JEL) where it was added to tanks of seawater containing …
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