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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Etudes de trois Criconematidae du Quêbec.

Blangez, Benoît January 1978 (has links)
No description available.

Environmental influences on nematode populations and studies on Tylenchorhynchus.

Ogiga, Inko R. January 1971 (has links)
No description available.

Natural control of soil inhabiting nematodes.

Khan, Shakil Ahmad. January 1973 (has links)
No description available.

The effects of the SCCmec element and colony spreading on the virulence of methicillin resistant Staphylococcus aureus in a nematode model

Rea, Megan S. 03 April 2013 (has links)
Methicillin resistant Staphylococcus aureus presents clinical challenges. The ability of S. aureus to cause human disease is correlated with the nematocidal activity of that isolate. This thesis investigates the relationship between SCCmec type, colony spreading, and the presence of the fudoh/psm-mec region of MRSA isolates to their ability to kill Caenorhabditis elegans. PCR was used to test for the fudoh/psm-mec region in 420 CMRSA2 isolates and 155 CMRSA1 isolates. Spread plate assays were performed on 149 CMRSA2 isolates to determine correlation between SCCmec type and colony spreading. Fudoh/psm-mec was correlated with the infection/colonization status of a patient. SCCmec type IV was correlated with increased spreading ability. SCCmec type, PFGE type, spa type, and colony spreading ability of 40 MRSA isolates were determined; these isolates were characterized using a nematode killing assay. It was found that the colony spreading ability of an isolate correlated with the nematocidal ability of that isolate.

A pragmatic approach to identifying Aphelenchoides species for plant health quarantine and pest management programmes

Hockland, Sue January 2001 (has links)
The genus Aphelenchoides consists of over 140 nominal species, some of which are pathogenic to plants. Nematologists in statutory and other diagnostic laboratories need to be able to distinguish pathogens with confidence if financial losses and unnecessary chemical control are to be avoided, but no complete key to this genus has been available to date. A revised list of species was produced, deleting descriptions considered too poor for subsequent recognition. Key diagnostic characters were identified and promising features for future diagnostic use were investigated. A polytomous key (polykey) was developed and tested on 14 populations. The findings contributed to a further reduction in the number of valid species from a diagnostician's point of view, and also led to revisions of the polykey itself as key characters were tested for their distinguishing power. The primary key characters were identified as the length of the post-vulval sac (pvs) as a percentage of the distance between the vulva and the anus, the shape of the tail terminus and tail, body length, and the ratios `a' (body length divided by greatest body width) and `c' (body length divided by tail length). Promising key characters for the future are c' (tail length divided by body width at the anus or cloaca), the distance from the vulva to the anus, vulval body width, pvs length as a measure of the vulval body width, head width and all measurements associated with the median bulb. The polykey provides the essential foundation for the development of new diagnostic tools, including new keys for diagnostic use; preliminary work with molecular techniques showed promise for inclusion in diagnostic protocols, but further study will be required to develop reliable methodology for each of the economically important species. Nominators of new species should use the recording form to provide details of morphological and morphometric characters and compare resulting polycodes with others in the polykey and associated databases before publication. Likewise, the key should continue to be tested for its validity.

Diversity and mass production of slug-parasitic nematodes

Ross, Jenna Louise January 2010 (has links)
The slug-parasitic nematode, <i>Phasmarhabditis hermaphrodita, </i>was made commercially available as a biological control agent in 1994 under the trade name of Nemaslug. The product is sold as infective dauer juvenile nematodes bound to Calcium montmorillonite clay or finely powered vermiculite, to produce a water-dispensable formulation.  Retail sales for this product are approximately £1 million in Europe. However, the price of Nemaslug is still considerably greater than its chemical competitors.  Therefore one of the main objectives of this thesis was to investigate the mechanisms and environmental parameters involved with dauer juvenile formation, in order to improve mass production methods.  Another objective was to examine new retail markets out with Europe, as it is generally not possible to sell <i>P. hermaphrodita </i>in countries in which it is not indigenous.  This was achieved by collecting slugs from areas around the world where they are known to be important economic pests (i.e. USA and South Africa), and examining them for the presence of internal nematode parasites.  Information from nematode strain collections were then used to investigate the role of parasite release in the invasion of European slugs in to the USA, the diversity and distribution of terrestrial slugs and their associated nematode parasites, and the phylogenetic relationship of slug-parasitic nematodes.

A comparative study of the biology and morphology of Meloidogyne species from Saudi Arabia with some biochemical comparisons

Zafran, Hany January 1993 (has links)
No description available.

Biology of Anguina mobilis n.s.p. on capeweed (Cryptostemma calendulaceum)

Chit, Walter January 1972 (has links)
iv, 130 leaves : ill. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Pathology, Waite Agricultural Research Institute, 1972?

The population ecology of the lesion nematode, Pratylenchus thornei and the root knot nematode, Meloidogyne javanica

Grandison, Gordon S. January 1972 (has links)
107 [23] leaves : ill. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.1972) from the Dept. of Plant Pathology, Waite Agricultural Research Institute, University of Adelaide

The ecology of Pratylenchus minyus

Kimpinski, Joe January 1972 (has links)
180 leaves [14 p.] : ill. ; 26 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Pathology, Waite Agricultural Research Institute, 1973

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