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 91 for “"Natural variation"”.
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Circadian regulation and natural variation of low temperature signaling in Arabidopsis
… affect plant freezing tolerance. Investigating natural variation of cold response pathways in ecotypes of Arabidopsis provides another means of distinguishing genes important for freezing tolerance. In previous studies, two Arabidopsis populations collected from Sweden (SW) and Italy (IT) were …
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Natural variation of water use and water productivity in Arabidopsis thaliana
… established over the past 15 years where the natural variation of water use efficiency has been studied in the model species Arabidopsis thaliana (Arabidopsis). At the same time, a substantial degree of criticism has arisen with respect to the use of drought resistance and WUE as measures of …
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Natural Variation in Arabidopsis thaliana Growth in Response to Ambient Temperatures
… Trait Loci (QTL) responsible for the natural genetic variation of hypocotyl length in response to ambient temperatures. The Arabidopsis thaliana accessions were phenotyped for hypocotyl length at 12°C, 17°C, 22°C and 27°C ambient temperature environments and substantial genetic …
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Exploiting natural variation in Plantago seed composition for food and human health applications
… candidature to be less than ideal for screening natural variants.. Previously published methods were often incomplete, time-consuming, and unnecessarily wasteful of precious seed stocks. Instead the new method described in Chapter 3 can be used to extract fractions of mucilage from small …
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Natural Variation and Gene Expression in the Male Courtship Progression of Drosophila Melanogaster
Natural genetic variation in the temporal sequence of male courtship behavior can be one target of selection. The goals of this research were to identify variation in the sequence of male behavior using a natural population, and investigate the genetic underpinnings of this variation. A new, …
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Natural variation of Pinus pinaster metabolome in abiotic stress responses: modeling of omics data
… calor y la sequía en P. pinaster y su variación natural empleando un enfoque integrado de biología de sistemas. Para ello, aplicamos diferentes intensidades de estrés, orden de exposición al estrés y procedencias para imitar un probable escenario futuro con el fin de proporcionar un conjunto de …
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Murky waters: discerning among sources of natural variation under high uncertainty and at multiple scales
… concern due their high susceptibility to variation under changing regional climates. I investigated the proportion of consumer biomass derived from terrestrial sources, allochthony, in three metabolic classes of high elevation lakes using a modular, Bayesian, stable isotope mixing model. …
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Natural variation in the human plasma lipidome signature using mass spectrometry: relevance to healthy ageing
… of genetic and environmental influences on variation in plasma lipids from the Older Australian Twin Study (OATS), using n=75 pairs of monozygotic twins and n=55 pairs of dizygotic twins. Lipidomics was conducted using liquid chromatography - mass spectrometry (LC-MS). Major findings include …
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The Genetic Basis Of Natural Variation In The Timing Of Vegetative Phase Change In Arabidopsis Thaliana
… vegetative and reproductive phase changes. While natural variation in the reproductive transition is well studied, the transition between juvenile and adult vegetative growth — vegetative phase change — is often overlooked. Vegetative phase change is regulated by the microRNA, miR156, and its …
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Characterizing the maize Xanthomonas vasicola pv. Vasculorum pathosystem: tissue-specific lifestyles and natural variation in tissue-specific resistance
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Natural variation and evolution of response and adaptation mechanisms of plants to the combination of drought and heat stress.
El cambio climático se considera una amenaza importante para los ecosistemas. Como organismos sésiles, las plantas son particularmente vulnerables, al ser perturbaciones rápidas que superan su capacidad de aclimatación y/o adaptación. La combinación de estrés por calor y sequía debido al cambio …
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The ultrastructural morphology of Eimeria tenella exhibits striking natural variation and undergoes significant changes during the first few hours of infection
… was found to vary from 13 to 16 per conoid. This variation was seen in both freshly hatched and post-invasion sporozoites, suggesting that genetic factors are involved. Following analysis of structures within the conoid, my data suggests that secretory organelle protein release occurs through …
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Characterization of natural variation in steady- and non-steady-state photosynthesis and its underlying mechanisms to improve productivity in rice (Oryza sativa)
… of photosynthesis in the future. Significant variation was found for photosynthetic traits both in steady- and non-steady-state light conditions within cultivated rice (Oryza sativa) accessions and two wild rice species. In most cases, more natural variation was found in non-steady-state …
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A tripartite survey of CRISPR-Cas diversity: Assessing the contours and limits of natural variation in CRISPR-Cas systems by associated genes and spacer acquisition biases
Explorations of anti-phage defence systems, with a focus on CRISPR-Cas system diversity, in the past decade has enabled many significant advances in biotechnology especially in programmable gene editing platforms. Many previous investigations have employed guilt by association based data mining …
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A tripartite survey of CRISPR-Cas diversity: Assessing the contours and limits of natural variation in CRISPR-Cas systems by associated genes and spacer acquisition biases
Explorations of anti-phage defence systems, with a focus on CRISPR-Cas system diversity, in the past decade has enabled many significant advances in biotechnology especially in programmable gene editing platforms. Many previous investigations have employed guilt by association based data mining …
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Identification of platinum ores via trace element signatures
This project studies the natural variation in the elemental composition of processed platinum ore from different extraction locations in South Africa in order to assess whether this provides sufficient information for the elemental fingerprinting" of the material.
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Harnessing the genetic potential for arbuscular mycorrhizal symbiosis in rice
… interest in the potential for use of AMF as natural biofertilizers in sustainable agroecosystems (Berruti et al., 2015). Despite this, such potential is currently limited by the variable nature of plant host response, particularly mycorrhizal growth responsiveness (MGR) (Hetrick et al., 1992; …
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Understanding the development, evolution, and function of bullseye pigmentation patterns in Hibiscus trionum
… and creating diversity, in petal patterns. Natural variation in the bullseye pattern in close relatives of H.trionum from Australia and New Zealand is in part due to four independent restrictions of anthocyanin pigmentation in the petal bottom. Preliminary results suggest restriction of …
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The emergence of a negative feedback bias as a product of supervisor and subordinate dynamics: consequences of opportunity-based supervision and performance variation
… had erred by failing to recognize the natural variation of their students' performance. In general, this error applies primarily to the conditions under which supervisors acquire and interpret information. Two factors were hypothesized as responsible for the emergence of a NFB: (a) …
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‘Fit for surgery’; retrospective analysis of the relationship between cardiorespiratory fitness and postoperative outcome
… It was hypothesised that: 1) Natural variation (biological and analytical noise) is present in markers of CRF and thus impacts upon patient fitness stratification, 2) CRF is impaired in diseased patients and can predict postoperative outcomes, 3) Preoperative CRF is lower in …
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