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排序方式: 共有216条查询结果,搜索用时 15 毫秒
211.
Joanna Blaszkowska Piotr Kurnatowski Anna Wojcik Katarzyna Goralska Katarzyna Szwabe 《Veterinary parasitology》2014,199(3-4):165-171
The ovicidal activity of seven fungal strains: Acremonium alabamense, Alternaria chlamydospora, Cladosporium herbarum, Fusarium solani, Paecilomyces variotii, Paecilomyces viridis and Penicillium verruculosum isolated from urban soil samples from Poland was determined in vitro. The fungal mycelium was co-cultured with Ascaris suum eggs on plates with 2% water–agar for 28 days. Eggs exposed and unexposed (control) to fungal mycelium were observed weekly by light microscopy and the percentage of malformed eggs were determined. The eggs were classified according to following parameters: type 1 – biochemical and physiological effect without morphological damage to the eggshell; type 2 – lytic effect with morphological alteration of the eggshell and embryo; type 3 – lytic effect with morphological alteration of eggshell and embryo with hyphal penetration and internal egg colonization. All examined species of fungi extended embryogenesis, but the retardation of embryonic development was varied and depended on the species. A. alabamense, A. chlamydospora and P. verruculosum exhibited very high inhibitory activity on A. suum egg development. The fungus-exposed eggs revealed morphological alternations in all stages of embryogenesis. Isolates of F. solani, P. variotii and P. viridis showed hyphal penetration and internal colonization of A. suum eggs (type 3 effect). No appressoria were produced and simple hyphal penetrations were most commonly observed. A. alabamense and P. verruculosum demonstrated morphological destruction, with eggshell destruction. The remaining fungi showed type 1 effect. The results demonstrated that examined strains of F. solani, P. variotii and P. viridis may be considered to be potential limiting factors of parasitic geohelminth populations. 相似文献
212.
213.
Ewelina WARZYCH Adam CIESLAK Zofia E. MADEJA Piotr PAWLAK Anna WOLC Dorota LECHNIAK 《The Journal of reproduction and development》2014,60(1):1-8
Numerous attempts have been recently made in the search for a reliable, fast and
noninvasive assay for selection of oocytes suitable for in vitro embryo
production. Potential markers have been described in the follicle such as follicular fluid
(FF) or cumulus cells (CCs). However, the reported findings are contradictory, which may
reflect the complexity of metabolism of the ovarian follicle. In the present experiment, a
data set from individual follicles of known diameter was obtained: cumulus-oocyte complex
(COC) morphology, fatty acid composition and glucose concentration in FF as well as
apoptotic index in CCs. The obtained data was statistically analyzed either separately
(univariate analysis) or simultaneously (multivariate analysis) to examine its predictive
value in morphology assessment of bovine COCs. Although the univariate analysis yielded a
complex relation system of the selected parameters, no clear outcome could be established.
In multivariate analysis, the concentration of the four fatty acids (C16:0, C16:1,
C18:1cis9, C22:5n3) and Δ9-desaturase (16) as well as elongase activities were
selected as covariates. This allowed prediction of the morphology of a COC with an
accuracy of 72%, which is the most interesting finding of the experiment. The present
study indicates that the multifactorial model comprising of selected parameters related to
the follicle appeared more effective in predicting the morphology of a bovine COC, which
may improve the effectiveness of in vitro production systems. 相似文献
214.
Adam Kaliński Mirosława Bańbura Michał Glądalski Marcin Markowski Joanna Skwarska Jarosław Wawrzyniak Piotr Zieliński Iwona Cyżewska Jerzy Bańbura 《Landscape Ecology》2014,29(9):1521-1530
Integration of landscape ecology and conservation physiology has been recommended as a potentially useful way to investigate consequences of human-induced changes in habitats for animal populations. A central goal of this paper was to examine if a simple physiological parameter displays any consistent patterns of spatio-temporal variation. Blood glucose concentration in birds reflects their high metabolic demands and may be influenced by a number of environmental factors. Therefore we present results concerning variation in glucose concentration in the blood of c. 14-day-old nestling blue tits (Cyanistes caeruleus) in central Poland in an 8-year period, 2005–2012, in two landscapes: an urban parkland and a deciduous forest. The most important findings of the study were: (1) mean levels of blood glucose varied markedly among years, most probably due to variable weather conditions, (2) glucose concentrations were significantly higher in the parkland study site than in the forest site, (3) heavier nestlings had lower glucose levels, and (4) high glucose levels were negatively correlated with fledging and breeding success. Thus we have confirmed that a consistent spatio-temporal pattern really exists. 相似文献
215.
Transgenic cucumber lines expressing the chimeric pGT::Dhn24 gene do not show enhanced chilling tolerance in phytotron conditions 下载免费PDF全文
216.
Niemczyk Marzena Chmura Daniel J. Socha Jarosław Wojda Tomasz Mroczek Piotr Gil Wojciech Thomas Barb R. 《European Journal of Forest Research》2021,140(6):1341-1361
European Journal of Forest Research - The contribution of Douglas-fir (Df) to European forests is likely to increase as the species is a potential adaptation option to climate change. In this... 相似文献