Anatrichosoma sp. in the footpads of a cat: Diagnosis and pathology of Namibian case     

B.H. Noden  E.C. Du Plessis  C. Morkel  U. Tubbesing  M. Soni 《Veterinary parasitology》2013,191(3-4):386-389

Anatrichosoma species are an unusual group of zoonotic trichuroid nematodes. Due to limited knowledge of their life cycle and diagnostic challenges, anatrichosomiasis has been reported only 3 times in domestic animals. A short-haired cat from central Windhoek, Namibia, presented with ulceration, swelling, and sepsis on all four paws, a severe generalized lymphadenopathy and considerable invasive eosinophilia. Histological analysis revealed epidermal hyperplasia, with severe serocellular crusting on the skin surface. One specimen revealed a series of thick-walled eggs within nematode segments with a few sections containing eggs with bioperculate appearance which is compatible with the Aphasmid group of nematodes, more specifically, the genus Anatrichosoma. Ivermectin treatment completely cleared the condition. This is the first report of Anatrichosoma sp. in the Republic of Namibia, identified from a unique location in the capital, Windhoek.  相似文献   

A Fresh Look at the Anatomy and Physiology of Equine Mastication     

Padraic M. Dixon  Nicole du Toit  Carsten Staszyk 《Veterinary Clinics of North America: Equine Practice》2013

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ANNUAL REPORT OF THE EXECUTIVE COMMITTEE OF THE SOUTH AFRICAN FORESTRY ASSOCIATION FOR THE YEAR ENDED MAY 31, 1959     

P. E. du PREEZ 《Southern Forests》2013,75(1)

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The role of oxylipins and antioxidants on off-flavor precursor formation during potato flake processing     

Gosset V  Göbel C  Laine G  Delaplace P  du Jardin P  Feussner I  Fauconnier ML 《Journal of agricultural and food chemistry》2008,56(23):11285-11292

The impact of processing on nonenzymatic antioxidant degradation and lipid oxidation leading to off-flavor development in potato flakes during storage was investigated. Lipoxygenase activity measurements in parallel with the analysis of lipid oxidation products (oxylipins) profiles using HPLC showed that the processing conditions used inhibited efficiently enzymatic lipid oxidation. However, nonenzymatic lipid oxidation products were found throughout processing and in fresh potato flakes. Furthermore, these autoxidative processes cannot be inactivated by the main endogenous nonenzymatic antioxidants in potato tubers (ascorbic acid, phenolic compounds and carotenoids), as these antioxidants are degraded during processing. Indeed, leaching and thermal treatments taking place during processing lead to a decrease of about 95%, 82% and 27% in the content of ascorbic acid, phenolic compounds and carotenoids, respectively. Therefore, storage is a critical step to prevent off-flavor development in potato flakes. Specific attention has thus to be paid on the use of efficient exogenous antioxidants as well as on storage conditions.  相似文献   

A case of verminous mastitis in a mare     

Z. Gratwick  J. Frean  D. du Plessis  M. Hewetson  V. Schwan 《Equine Veterinary Education》2021,33(8):e248-e252

This report describes bilateral mammary gland infection with a previously unidentified Cephalobus species of nematode. Only one previous case of verminous mastitis due to a Cephalobus species has been reported, pre-dating the widespread use of molecular diagnostics. This report describes the case presentation and management, as well as the morphological and molecular methods of nematode identification.  相似文献   

Yield response of potato genotypes to different soil water regimes in contrasting seasons of a subtropical climate     

J. M. Steyn  H. F. Du Plessis  P. Fourie  P. S. Hammes 《Potato Research》1998,41(3):239-254

Summary Potato crops in subtropical climates are often subjected to water stress, resulting in low yields and poor tuber quality. The yield response of potato genotypes to water supply was investigated in six trials, three each in spring and autumn plantings. Trials were conducted under automated rain shelters, using an irrigation boom to impose five soil water regimes. The negative effect of water stress on tuber yield was more detrimental in spring than in autumn, because of higher atmospheric evaporative demand and higher temperatures in spring. An average yield reduction of 68% was recorded for the most severely stressed regime in spring plantings, while the mean reduction for the same treatment in autumn was only 42%. Genotypic differences in yield response to drought were clearly illustrated in spring, but not in autumn. This suggests that the choice of genotypes is only influenced by the availability of water in spring, when more drought tolerant genotypes should be used.  相似文献   

深圳地区红树植物淡水种植试验   总被引：1，自引：1，他引：0  

栾建国  杜灿坤  何德善 《水生态学杂志》2011,32(2):63-68

2004-2010年,在深圳地区进行了红树植物淡水种植及品种筛选试验。在红树植物育苗方面,7个受试品种(秋茄、桐花树、海漆、海桑、无瓣海桑、木榄和老鼠勒)均获得了成功,出苗率较好;在种植方面,9个品种(木榄、桐花树、海桑、无瓣海桑、秋茄、海漆、老鼠勒、银叶树和竹节树)均能在淡水环境中存活。海桑、无瓣海桑和竹节树生长较好,在构建淡水人工湿地时,应优先选用。在2008年冬季受到异常低温干扰时,有部分海桑植株死亡,但温度回升后,很快萌发新芽再生。秋茄和木榄生长缓慢,植株生长2～3年仍不能成林。海漆在水位变化大且沙泥质河滩地生长情况良好,对生境条件要求严格。桐花生长情况良好,在淡水环境条件下虽能开花,但结果不良。老鼠勒虽能存活,但长势不理想。  相似文献   

Evidence that Austropuccinia psidii may complete its sexual life cycle on Myrtaceae          下载免费PDF全文

A. R. McTaggart  G. M. Granados  E. du Plessis  S. Fraser  I. Barnes  S. Naidoo  M. J. Wingfield  J. Roux 《Plant pathology》2018,67(3):729-734

The rust fungus Austropuccinia psidii has spread globally and naturalized in areas with naïve species of Myrtaceae. Previous studies have revealed multiple strains of A. psidii within South America and two strains outside of its native range. The rust spreads by windborne mitotic urediniospores, which are the dominant spore stage. Teliospores and basidiospores of A. psidii are also formed; however, the biological role of these stages in the life cycle is unknown. Experiments presented here tested whether basidiospores of A. psidii could infect Syzygium jambos. The sori produced by infection with basidiospores were screened with five microsatellite markers to confirm whether they were a product of recombination. The findings showed that basidiospores of A. psidii could cause infection on species of Myrtaceae and the resulting sori were a product of recombination. This has important implications for programmes that breed for resistance to this aggressive pathogen in commercial eucalypt forestry.  相似文献   

加强农业技术推广体系建设的对策   总被引：10，自引：1，他引：9  

杜丽华 《中国农学通报》2011,27(11):176-180

农业技术推广体系是促进农业发展方式转变的重要支撑,以政府为主体的农业技术推广体系,已经不适应农村经济社会发展和新农村建设的需要。针对中国现行农业技术推广体系存在的问题,加强农业技术推广体系建设,必须推进农业技术推广体制改革,构建以政府为主导的多元化农业技术推广组织,完善农业技术推广保障机制,加强农业技术推广人才队伍建设,提高农业技术推广人才队伍素质,继续完善农业科技特派员制度。  相似文献   

Nematode resistance in bananas: screening results on some wild and cultivated accessions of Musa spp.     

P. Quénéhervé  C. Valette  P. Topart  H. Tezenas du Montcel  F. Salmon 《Euphytica》2009,165(1):123-136

Bananas cultivated for export all belong to Cavendish cultivars and are all recognized as very susceptible to nematodes, particularly to the burrowing nematode Radopholus similis and the lesion nematode Pratylenchus coffeae. Even if there have been many changes in the management of banana nematodes in large commercial banana plantations, chemical control still remains most often the last resort method to manage the nematodes, although the number of registered products is definitely declining. Therefore, nematode control though genetic improvement is gaining new interest worldwide. In this study, 55 banana accessions mostly diploids from the Musa acuminata genome group (AA) but including some triploid accessions (AAA), some diploids of the Musa balbisiana genome group (BB) and some interspecific hybrids (AAB, AB) were evaluated for resistance to four nematode species R. similis, P. coffeae, Meloidogyne incognita and M. arenaria. These experiments were conducted in a growth chamber under controlled conditions. All banana accessions were susceptible to nematode species, although many different levels of susceptibility were detected. This study confirmed the good resistance status to R. similis of some cultivars from the Pisang jari buaya and Pisang batuau subgroups and the partial resistance of 17 diploid accessions significantly different from the susceptible reference cv. Grande Naine. This study also showed that 12 diploid accessions exhibited a partial resistance to P. coffeae, including some usual or potential genitors belonging to the wild diploids subspecies burmannica (cvs. Long Tavoy 1 and 2) and burmannicoides (cv. Calcutta 4). No source of resistance to Meloidogyne spp. was found. These screening results, combining for the first time four nematode species, are discussed within the scope of banana breeding in order to produce parental diploid lines with single or combined nematode resistances and further develop triploids that can substitute existing susceptible commercial cultivars.  相似文献