排序方式: 共有15条查询结果,搜索用时 187 毫秒
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Miaomiao Xin Jan Sterba Anna Shaliutina-Kolesova Borys Dzyuba Jaroslava Lieskovska Serhii Boryshpolets Mohammad Abdul Momin Siddique Vitaliy Kholodnyy Ievgen Lebeda Otomar Linhart 《Fish physiology and biochemistry》2018,44(6):1527-1533
The loss of sperm quality in sterlet (Acipenser ruthenus) due to freeze-thaw process in cryopreservation was investigated in the present study. Two antifreeze proteins (AFPI or AFPIII) were used at different concentrations of 0.1, 1, 10, and 100 μg/mL. We compared motility, curvilinear velocity, and plasma membrane integrity of fresh, cryopreserved sperm, and sperm cryopreserved in the presence of antifreeze proteins. Fresh sperm (control) had 85?±?4% motility and 160?±?2 μm/s curvilinear velocity, respectively. After cryopreservation, the motility of frozen-thawed sperm without addition of antifreeze proteins significantly decreased (44?±?9%), compared to the control. The highest motility of frozen-thawed sperm was obtained in cryopreserved sperm with addition of 1 μg/mL of AFPIII (58?±?14%). No significant differences were observed in curvilinear velocity between fresh sperm and cryopreserved sperm with/without addition of AFPI or AFPIII. The flow cytometry analysis revealed that fresh sperm contained 94.5?±?6% live cells, while the cryopreserved sperm only contained 26.6?±?14% live cells. Supplementation of antifreeze proteins has significantly improved the percentage of live cells in frozen-thawed sperm, except 0.1 μg/ml of AFPI group. No significant difference in percentage of live cells was detected in the sperm cryopreserved with 10 μg/mL of AFPI or AFPIII, compared to fresh sperm. Thus, addition of antifreeze proteins to cryopreservation medium could be considered to improve the post-thawed sperm quality of sterlet. 相似文献
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Sophie Cornu Saskia Keesstra Antonio Bispo Maria Fantappie Fenny van Egmond Bozena Smreczak Rafał Wawer Lenka Pavlů Jaroslava Sobocká Zsófia Bakacsi Kinga Farkas-Iványi Sándor Molnár Anders Bjørn Møller Sevinc Madenoglu Dalia Feiziene Katrien Oorts Florian Schneider Maria da Conceição Gonçalves Raquel Mano Gina Garland Rastislav Skalský Lilian O'Sullivan Raimonds Kasparinskis Claire Chenu 《European Journal of Soil Science》2023,74(4):e13398
At the European scale, soil characteristics are needed to evaluate soil quality, soil health and soil-based ecosystem services in the context of the European Green Deal. While some soil databases exist at the European scale, a much larger wealth of data is present in individual European countries, allowing a more detailed soil assessment. There is thus an urgent and crucial need to combine these data at the European scale. In the frame of a large European Joint Programme on agricultural soils launched by the European Commission, a survey was conducted in the spring of 2020, in the 24 European participating countries to assess the existing soil data sources, focusing on agricultural soils. The survey will become a contribution to the European Soil Observatory, launched in December 2020, which aims to collect metadata of soil databases related to all kind of land uses, including forest and urban soils. Based upon a comprehensive questionnaire, 170 soil databases were identified at local, regional and national scales. Soil parameters were divided into five groups: (1) main soil parameters according to the Global Soil Map specifications; (2) other soil chemical parameters; (3) other physical parameters; (4) other pedological parameters; and (5) soil biological features. A classification based on the environmental zones of Europe was used to distinguish the climatic zones. This survey shows that while most of the main pedological and chemical parameters are included in more than 70% of the country soil databases, water content, contamination with organic pollutants, and biological parameters are the least frequently reported parameters. Such differences will have consequences when developing an EU policy on soil health as proposed under the EU soil strategy for 2023 and using the data to derive soil health indicators. Many differences in the methods used in collecting, preparing, and analysing the soils were found, thus requiring harmonization procedures and more cooperation among countries and with the EU to use the data at the European scale. In addition, choosing harmonized and useful interpretation and threshold values for EU soil indicators may be challenging due to the different methods used and the wide variety of soil land-use and climate combinations influencing possible thresholds. The temporal scale of the soil databases reported is also extremely wide, starting from the '20s of the 20th century. 相似文献
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Burkhard Messner Jaroslava Still Jürgen Berndt 《Pesticide biochemistry and physiology》1984,21(2):283-289
The effect of dibutyryl cyclic adenosine-3′,5′-monophosphate (DBcAMP) on the activity of aryl hydrocarbon hydroxylase (AHH) was studied under in vivo conditions in the liver of female rats. To maintain an elevated level of DBcAMP for a longer period of time, the nucleotide was given by a continuous infusion up to 26 hr without disturbing the animals. Under these conditions the basal activity of AHH was not significantly changed, indicating that cAMP is not an inducer or inhibitor of AHH. On the other hand, 3-methylcholanthrene-and phenobarbital-mediated induction of AHH was reduced in the presence of DBcAMP by about 50 and 35%, respectively. A reduced induction rate of AHH has also been seen after the application of the herbicide atrazine, which increases the endogenous level of cAMP. The results suggest that cAMP is not involved in the induction of AHH caused by xenobiotics. The inhibitory effect of DBcAMP on the induction of AHH may be due to an inhibition of enzyme synthesis which, in turn, may be the consequence of a direct effect of DBcAMP or an indirect effect caused by changes in the level of steroid hormones. 相似文献
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Jana Poláková Jaroslava Janků Martina Nocarová 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2018,68(8):709-718
This paper sets out to clarify the factors in soil erosion and soil conservation. The Czech Republic struggles with soil conservation. Shifts in the rural economy, the loss of good-quality agricultural soil to urbanisation, and sub-optimal land management leading to erosion are at issue. Here, we apply quantitative and qualitative methods to assess erosion risk, whilst considering legislative and policy measures and the responsibility of individual farmer. The studied area was the cadastral district of Rtyně-Podkrkono?í. This choice was based on the fact that farmland there is classified as being subject to ‘no risk’ under current reference measures with regard to soil erosion, and yet 18 erosion events in this area were reported over a period of three years. Our results provide evidence that current measures are insufficient. Although applicable standards were followed, the farmland in question has undergone repeated erosion, whilst soil conservation practice has been ineffective. Compared to the farmland owner, who invests in long-term management, we highlight the problem when a land manager prefers short-term returns. Our assessment of soil erosion was focused on repeated erosion reports that were filed in the monitoring system in relation to farmland parcels managed by a company specialising in maize production. The tolerable erosion rate of 4/t/ha/y was exceeded on all land parcels. 相似文献
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Rektorisova Michaela Hrbek Vojtech Jiru Monika Ovesna Jaroslava Hajslova Jana 《Plant foods for human nutrition (Dordrecht, Netherlands)》2020,75(3):376-382
Plant Foods for Human Nutrition - The composition of garlic (Allium sativum L.) may vary among cultivars and, moreover, change over time, thereby affecting both biological activity and flavour.... 相似文献
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Jaroslava Cieslarová Petr Smýkal Zuzana Dočkalová Pavel Hanáček Stanislav Procházka Miroslav Hýbl Miroslav Griga 《Genetic Resources and Crop Evolution》2011,58(3):439-451
Maintaining germplasm genetic integrity is a key objective of long-term ex situ conservation. Periodic regeneration, performed on limited plots with small number of individuals, increases the risk of genetic
drift and genetic diversity changes. In this study, six accessions of white flowered, dry seed pea varieties (Pisum sativum L. subsp. sativum var. sativum): Bohatyr, Klatovsky zeleny, Hanák, Moravsky hrotovicky krajovy, Raman and Viktoria-75 and four accessions of colour flowered,
fodder pea (P. sativum subsp. sativum var. arvense (L.) Poiret: Arvika, Česky banán, Moravská krajová and Niké, representing Czechoslovak varieties and landraces, bred over
the last 40–80 years, were analyzed using ten microsatellite locus specific markers. Each accession was represented by 20
individual seeds of two temporally different samples, spanning the period of 20 or 40 years. Together with intra-accession
variation (except of cv. Hanák), evidence of genetic changes, e.g. differences in allele frequencies as well as genetic composition
of sample, was detected in six out of ten accessions (Arvika, Bohatyr, Česky banán, Moravsky hrotovicky krajovy, Moravská
krajová and Raman). Evidence of genetic erosion was found in three accessions (Česky banán, Moravsky hrotovicky krajovy and
Raman), while in another three (Arvika, Bohatyr and Moravská krajová) the level of diversity was found to have increased.
Moreover in three samples of Bohatyr (2004) and Klatovsky zeleny (1963 and 2004), low levels of heterozygosity was detected.
These results demonstrate that in pea, a self-pollinating and highly homozygous plant, the danger of the loss of genetic integrity
exists. These findings are significant for long-term ex situ germplasm management. 相似文献
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Stefan H. Witte Abayomi K. Olaifa Andrew J. Lewis Randy B. Eggleston Jaroslava Halper Manfred Kietzmann Wolfgang Baeumer P.O. Eric Mueller 《Journal of Equine Veterinary Science》2009
The objective of this study was to evaluate the efficacy of topical application of a hyaluronan (HA) derivative in wound healing with respect to the rate of epithelialization, fibroplasia, angiogenesis and contraction, magnitude of the local inflammatory response, local expression of transforming growth factor-β 1 and 3 (TGF-β 1 and 3), tumor necrosis factor-α (TNF-α), and collagen type III deposition. In six healthy adult horses, six full-thickness skin wounds were created on the dorsal aspect of both metacarpi using a sterile template. Sites were sampled at 0, 1, 2, 5, 14, 21, and 35 days following wounding. Wounds on one limb were dressed with commercially available esterified HA fleece under a nonadherent dressing. The opposite limb was covered with the nonadherent dressing alone (control). Images of the most proximal wounds were used to determine the area of total healing and the relative contributions of epithelialization and contraction to healing. At each sample time, a control and treatment biopsy were taken for histological evaluation and special stains. All samples were evaluated for degree of inflammation, fibroplasia and angiogenesis; in situ hybridization for type III collagen, TGFβ1 and 3, and immunohistochemistry for TNF-α. Mean percentages of total wound healing, epithelialization, and wound contraction were not significantly different between control and treatment groups. In treated horses, initial wound expansion was significantly decreased during the first 2 weeks. Mononuclear cell numbers, counted in the granulation tissue, increased in both control and treated limbs over the entire course of the study. However at day 35 the macrophage numbers counted in the treated horses were significantly increased compared with the control limbs (P < .05). Although not statistically significant, relative staining for type III collagen in the treated wounds was less than that of control wounds. Results of the present study do not support a benefit of an exogenous HA-derivative in the healing of distal limb wounds in horses. The shortcomings of the study design are discussed. 相似文献