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 277 for “"nematodes"”.
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Statistical study of measurements of nematodes
… thesis is a preliminary statistical study on two nematodes, Horsenettle Cyst and Osborne Cyst. Each of the two nematodes were collected from two hosts, Horsenettle weed and tobacco. For each of the four combinations 115 nemas were selected, and six measurements were taken from each nema. A test of …
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Interactions between nematodes, potato and soil-borne micro-organisms and their effect on the management of potato cyst nematodes
Potato cyst nematodes (PCN) cause significant damage to the potato crop worldwide and growers experience economic losses related to yield loss and the cost of control measures. Experiments were set up to further elucidate the complex tritrophic PCNpotato-soil bacteria relationship. Bacterial …
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Active and Passive Settling By Marine Benthic Nematodes
… participate in the settlement of marine benthic nematodes. The settling rates of three estuarine benthic nematode taxa were examined in a linear flume using two treatments defined by the type of sediment bed placed in the flume. One treatment bed contained sediments rendered "unattractive" by …
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Biological Relationships Between Nematophagus Fungi and Mycophagous Nematodes
Made available in DSpace on 2014-12-09T22:25:46Z (GMT). No. of bitstreams: 1 6801811.pdf: 3002993 bytes, checksum: 27dbb7604fcc78d73342a451001d107b (MD5) Previous issue date: 1967
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Identification of Intestinal Cell Inclusions in Certain Nematodes
Made available in DSpace on 2014-12-04T22:45:53Z (GMT). No. of bitstreams: 1 0013466.pdf: 3508762 bytes, checksum: 6de6d4146e4bc07b86191ba7332d9ad8 (MD5) Previous issue date: 1955
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Developing a genetic toolkit for plant-parasitic nematodes
Nematodes belong to one of the most diverse phyla on the planet. Most nematodes are free living and feed on bacteria, fungi, and protozoa. Plant-parasitic lifestyles are relatively rare in terms of numbers, however, through their parasitism these nematodes have a substantial impact on agriculture. …
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DAF-12: A Novel Drug Target in Parasitic Nematodes
… their host (Wang et al. 2009), H. glycines nematodes only hatch as infectious J2s when they are near the plant roots required to support their development (Davis and Tylka 2005). This work demonstrates the importance of the DAF-12 ortholog in H. glycines for regulating hatching and …
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Interactions between mycophagous nematodes, mycorrhizal and other soil fungi
The hypothesis that mycophagous nematodes feed on the mycelia of VAM fungi and consequently reduce the spread of vesicular-arbuscular mycorrhizal (VAM) infection in plant roots and the growth response of plants to this infection was investigated in experiments carried out under controlled …
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DAF-12: A Novel Drug Target in Parasitic Nematodes
… their host (Wang et al. 2009), H. glycines nematodes only hatch as infectious J2s when they are near the plant roots required to support their development (Davis and Tylka 2005). This work demonstrates the importance of the DAF-12 ortholog in H. glycines for regulating hatching and …
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Investigating the role of neuropeptides in plant parasitic nematodes
Plant parasitic nematodes (PPNs) devastate agriculture on a global scale causing severe annual economic losses. Withdrawal of the chemical nematicides used to control PPNs, due to their harmful environmental effects, has led to a short fall in<br/>our ability to manage these pests. This thesis …
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Diversity and relationships of South Africa's fig-associated nematodes
Parasitic nematodes of the fig microcosm have received limited attention in South Africa. I have assessed the molecular diversity of nematodes present in the native South African species and discovered 24 undescribed species. Two were previously described but the descriptions need reviewing. I have …
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Spatial Ecology of Entomopathogenic Nematodes with Contrasting Foraging Strategies
… in foraging behavior of entomopathogenic nematodes (EPNs) but little is known about their dispersal patterns in the field. Overall goal of this dissertation research was to examine the dispersal behavior of two EPN species with contrasting foraging strategies, cruiser, …
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The Molecular Signatures of Adaptive Plasticity in Parasitic Nematodes
Entomopathogenic nematodes (EPN; Steinernema spp. and Heterorhabditis spp.) are parasites which kill and reproduce within insects. The infective juvenile (IJ) is a developmentally arrested, nonfeeding, stress tolerant stage which forages in the soil for new insects to infect. IJs carry symbiotic …
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Evolution of Pharyngeal Feeding Behaviors in Free-Living Soil Nematodes
The file named "ChiangJian-Tzyh.pdf" is the primary dissertation file. All other files ("*.mpg") are supplemental files and may be viewed individually.
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Systems based approaches to unravelling neuropeptide-receptor interactions in nematodes
… neuropeptide complements of selected parasitic nematodes and utilised an in silico pipeline for the prediction of neuropeptide-receptor interactions in these species. The neuropeptide profiles and predicted neuropeptide-receptor interactions presented advance our knowledge of neuropeptide …
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The development of gene silencing strategies for plant parasitic nematodes
… in two economically important plant parasitic nematodes (PRNs), the potato cyst nematode Globodera pallida and the root knot nematode Meloidogyne incognita. Much of the work contributing to this project has advanced our understanding of RNAi in these nematodes, and may also have broader …
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Characterization of 16B09 and 2D01 effector proteins in cyst nematodes
Cyst nematodes use stylet-secreted effector proteins to modify a selected host cell into an elaborate feeding cell. The function of the novel effector proteins 16B09 and 2D01 from the soybean cyst nematode (SCN) Heterodera glycines and sugar beet cyst nematode (BCN) H. schachtii was studied. This …
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Pheromones in entomopathogenic nematodes: effects on dispersal and reproductive behaviours
Entomopathogenic nematodes (EPN) are increasingly gaining favour as model organisms for studying traits relevant to parasitism and for their commercial value as biocontrol agents. The overall project aim is to explore the role of pheromones in coordinating a variety of important behaviours in …
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Population dynamics of potato cyst nematodes in relation to temperature
Population dynamics of potato cyst nematodes Globodera rostochiensis (Woll.) Skarbilovich and G. pallida (Stone) and their interactions with potato plants are not sufficiently described to explain changes in population dynamics and yield reduction among seasons and locations. This thesis describes …
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