排序方式： 共有32条查询结果，搜索用时 15 毫秒
1.
Falandysz J Lipka K Kawano M Brzostowski A Dadej M Jedrusiak A Puzyn T 《Journal of agricultural and food chemistry》2003,51(9):2832-2836
Total concentrations of mercury were determined using cold-vapor atomic absorption spectroscopy (CV-AAS) in the fruiting bodies of 16 species of wild mushrooms and underlying soil (0-10 cm) substrates collected in the areas of the Communes of Morag and ?ukta in the county of Ostróda in northeastern Poland in 1997-1998. A total of 174 composite samples of caps, 174 stalks, 80 whole fruiting bodies (collectively 1254 specimens), and 252 soils were examined. Among several species of mushrooms analyzed, the greatest concentrations were between 1300 and 71000 ng.g(-1) of dry matter. These levels were found in the caps of Sweating mushroom (Clitocybe rivulosa), King Bolete (Boletus edulis), and Common Puffball (Lycoperdon perlatum) and also were characterized by the highest bioconcentration factors (BCF) for Hg, which ranged between 160 +/- 82 and 110 +/- 34. The cap to stalk quotient for mercury concentrations was approximately 2 for most of the species except Poison Pax (Paxilus involutus), which had a greater concentration in caps than in stalks and a quotient of 4.4 +/- 7.2. Hg concentrations in the underlying soil substrates (0-10 cm layer) ranged between 21 +/- 21 and 390 +/- 130 ng.g(-1) of dry matter. The results showed that the consumption of mushrooms, considered to be the sole dietary source of mercury at the highest or mean element concentrations found, is not hazardous at daily ingestion rates of less than 70 and 210 g of fresh product, which would result in a hazard index value of less than unity. 相似文献
2.
Sylwia Magdalena Okoń Maria Chrząstek Krzysztof Kowalczyk Aneta Koroluk 《European journal of plant pathology / European Foundation for Plant Pathology》2014,139(1):9-12
Powdery mildew caused by Blumeria graminis DC. f. sp. avenae Em. Marchal. is a deleterious foliar disease of common oat which occurs in many parts of the world. Resistance existing in oat cultivars is broken down by new races of this pathogen and because of this fact there is necessity to look for new and effective sources of resistance to powdery mildew in oat. To identify new potential resistance sources to powdery mildew, a total of 67 oat genotypes from five different species Avena sterilis, A. fatua, A. sativa, A. maroccana and A. murphyi and 20 powdery mildew isolates were investigated for disease reactions. Among tested oat accessions the highest level of resistance was associated with A. maroccana genotypes. Genotypes belonging to species of A. murphi and A. sterilis also showed a good level of resistance. Identified genotypes could be used in oat breeding programmes to improve levels of resistance to powdery mildew. 相似文献
3.
Daniela Moyankova Aneta Lyubenova Slavtcho Slavov Dimitar Djilianov 《European journal of plant pathology / European Foundation for Plant Pathology》2014,138(1):149-155
The Phytophthora pathogens are among the most important pests in the modern agriculture and forestry. This makes them a subject of intensive studies, including laboratory experiments with in vitro culture on various plant-derived media. Here we show that leaf extracts from the resurrection endemic plant Haberlea rhodopensis stimulates significantly the in vitro growth of various isolates from several Phytophthora species. The extracts stimulate the formation of oospores in some heterothallic species. In this respect, the idea to propose Haberlea extracts as a potential ingredient of culture media for Phytophthora spp. maintenance under controlled conditions or as a component of detection systems for Phytophthora presence in nature seems quite attractive and promising. 相似文献
4.
5.
Aneta Olek Leszek Klimek Elbieta Bo&#x;tacz-Rzepkowska 《Journal of veterinary science (Suw?n-si, Korea)》2020,21(6)
BackgroundBovine and porcine teeth are often used in in vitro experiments as substitutes of human teeth.ObjectivesThe aim of the present study was to perform a comparative analysis of enamel morphology of permanent human, bovine and porcine teeth under the scanning electron microscope.MethodsAs many as 10 human, 10 bovine, and 10 porcine teeth were studied. All the teeth were sectioned and the halves were randomly divided into 2 groups according to the examined tissue (vestibular enamel at the mid-height of the dental crown and in the cervical area). Human and bovine enamel was etched for 15 sec and porcine enamel for 30 sec. The scanning electron microscope analysis was performed. The length and width of enamel prisms were determined with the “Met-Ilo” 1.1 computer program.ResultsAll enamel samples revealed the same etching pattern—Silverstone''s type 2. Bovine enamel showed a similar porosity and the amount of interprismatic enamel compared to human enamel while the amount and width of interprismatic enamel bands in porcine enamel were evidently greater. The shape of the porcine prisms was visually similar to human prisms, although dimensions were significantly different. However, bovine prisms differed in form and appeared to be distinctly elongated.ConclusionsReported findings indicate that the results of experimental studies carried out on bovine and porcine enamel should not be compared with the results obtained on human enamel. 相似文献
6.
New Immigrants Seeking New Places: The Role of Policy Changes in the Regional Distribution of New Immigrants to Canada 
下载免费PDF全文
下载免费PDF全文 Canada, the U.S., and Australia have recently experienced an increased regional dispersion of entering immigrants. American research suggests that a mixture of economic push factors (away from states like California) and pull factors (toward states with growth of low‐wage jobs) and changing government policies and regulations contributed to the development of the New Gateways. Very few studies have been conducted to determine why the regional dispersion of entering immigrants occurred in Canada. This paper assesses the extent to which changes in immigration selection programs, notably, the Provincial Nominee Programs, contributed to the regional dispersion of entering immigrants. Using data from immigrant landing records, this study shows that different factors accounted for changes in the share of immigrants settling in different destinations. Changes in immigration selection programs played the primary role in the increasing numbers going to Saskatchewan and Manitoba, although improving economic conditions may have played an indirect role. Shifts in immigrant source regions were an important factor in the decrease in immigration to Toronto and in the increase to Montréal. Economic conditions likely played a significant role in the changes in the shares of new immigrants going to Toronto, Montréal, Calgary, and Edmonton. 相似文献
7.
8.
Hanna Bolibok Monika Rakoczy-Trojanowska Aneta Hromada Robert Pietrzykowski 《Euphytica》2005,146(1-2):109-116
Summary The aim of this study was to investigate the efficiency of ISSR, SSR, and SAMPL marker systems in detecting genetic polymorphism
among 30 winter rye inbred lines and to compare the results of cluster analysis performed on data from these marker systems
using different statistical methods and coefficients. Each marker system was able to discriminate among the materials analyzed
with the lowest value of average genetic similarity (GS) obtained with ISSR markers (0.2888) and the highest with SAMPLs (0.5381).
EST-derived SSRs turned out to be less efficient in detecting genetic diversity than those from genomic libraries (average
GS values 0.3814 and 0.3221, respectively). The average GS value for combined SSR data was 0.3569. The lack of correlations
between similarity and cophenetic matrices obtained with various methods systems suggests that different marker systems should
be used simultaneously for a genetic diversity study to exploit as many sources of polymorphisms as possible. 相似文献
9.
Kottackal Poulose Martin Aneta Sabovljevic Joseph Madassery 《Journal of Crop Science and Biotechnology》2011,14(3):205-212
High-frequency transgenic plant regeneration and production of plumbagin were accomplished from hairy roots induced by Agrobacterium rhizogenes strain A4M70GUS on Plumbago indica L. Of the two types of hairy roots developed on Murashige and Skoog (MS) basal medium, Type I was long and thick with lesser
branches and root hairs, and Type II was highly-branched short and slender with tufts of root hairs. Of the different lines
grown in half-strength MS liquid basal media, root line 5 (R5) of the Type I yielded the highest plumbagin (0.92% DW) and
was significantly different to that of the in vitro control. R5 showed a stable production of plumbagin (1.09% DW) in subsequent cultures. Elicitation of R5 with 50 μM methyl
jasmonate for 48 h increased the yield of plumbagin to 5.0% DW, and was superior to 100 μM acetylsalicylic acid (3.8% DW).
Plumbagin yield was five times that of twoyear-old ex vitro roots. Histochemical assay and PCR analysis using the primers of uidA coding region confirmed the transformation. Hairy root segments cultured on MS medium containing 8.8 μM benzyladenine and
2.5 μM indole-3-butyric acid induced a mean of 9.1 shoots. Subsequent culture of the isolated shoots developed more than 50
normal shoots per culture. The root-free shoots were rooted on half-strength MS basal medium. The plantlets transferred in
field conditions grew normally and exhibited 90% survival. Transgenic plant regeneration and hairy root induction in P. indica serves as reliable source of plumbagin which in turn cut off the mass destruction of the plant species. 相似文献
10.
Paulina Nowicka Aneta Wojdyło Piotr Laskowski 《Plant foods for human nutrition (Dordrecht, Netherlands)》2018,73(4):314-320
The presented study provides important insights on the health properties of Prunus persica fruit related to their polyphenol and carotenoid profiles, antioxidant capacity and in vitro potential to inhibit enzymes relevant to type 2 diabetes (α-amylase, α-glucosidase) and obesity (pancreatic lipase) management. Such results have not been published so far. The study showed substantial differences in the chemical composition of peach fruit depending on the cultivar. At the same time, it demonstrated some common features of selected cultivars - the varieties with light flesh (‘Spring Time’; ‘Madison’) were characterized by a high content of phenolic acids and flavonols, thus exhibiting high activity against α-amylase, while the yellow varieties with high content of carotenoids (‘Harrow Diamond’; ‘Harrow Beauty’) showed high inhibitory activity toward porcine pancreatic lipase. Finally, it has been shown that peach fruit is an interesting raw material with a varied chemical composition and nutritional value, especially with high inhibitory potential against digestive enzymes linked to obesity and type 2 diabetes, strongly determined by the cultivar. 相似文献