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1.
Jirovský D Kosina P Myslínová M Stýskala J Ulrichová J Simánek V 《Journal of agricultural and food chemistry》2007,55(19):7631-7637
This paper describes a sensitive isocratic HPLC/ECD method developed for the determination of rosmarinic acid (RA) in plant material, animal feed, and pig plasma. The plasma sample preparation only includes protein precipitation and adjustment of the pH. The applicability of the method was tested on plasma samples of pigs that were exposed to a 91-day oral intake of RA via feed enriched by aerial parts of Prunella vulgaris. The plasma was directly analyzed using the method described as well as after enzymatic hydrolysis. When no hydrolysis step was included, RA and caffeic acid (CA) were quantified in the plasma. In hydrolyzed plasma samples, several other metabolites were determined, including dihydrocaffeic, ferulic, and dihydroferulic acid. The dual-channel coulometric detection employed, as an alternative to mass spectrometry, offers good selectivity and sensitivity owing to the electrochemical properties of the phenolic constituents. 相似文献
2.
Hochmalová Miroslava Purwestri Ratna Chrismiari Yongfeng Jian Jarský Vilém Riedl Marcel Yuanyong Dian Hájek Miroslav 《European Journal of Forest Research》2022,141(5):867-886
European Journal of Forest Research - Ecosystem services are investigated from many perspectives, but there are very few studies comparing the perception of forest and demand for forest ecosystem... 相似文献
3.
Shengwu Hu Chengyu Yu Huixian Zhao Genlou Sun Suolao Zhao Miroslava Vyvadilova Vratislav Kucera 《Euphytica》2007,154(1-2):9-16
Summary The genetic diversity and relationships among 63 rapeseed accessions, including 34 Chinese, 22 Czech, 2 Swedish, 2 German,
one French and 2 Canadian accessions, were evaluated by nine agronomically important characters in the field at Yangling,
Shaanxi, China. Significant differences between Chinese and European group in plant height, setting position of the first
primary branch, number of siliques of the terminal raceme, thousand seed weight and seed yield per plant were detected. There
were significant variations in nine agronomic characters among the tested rapeseed accessions. Ward’s minimum variance cluster
analysis based on Mahalanobis distances on the raw data of nine agronomic characters clearly separated the European accessions
from the Chinese ones. However, the Chinese accessions with erucic acid free and/or low glucosinolates could not be separated
from those Chinese accessions with both high erucic acid and glucosinolates. In general, cluster analysis of the 63 accessions
based on the selected agronomic characters was consistent with known pedigree information and geographic origin, as well as
the previous RAPD results of these accessions. The European rapeseed could be important germplasm resources for enriching
the genetic background of Chinese rapeseed, and vice versa. 相似文献
4.
Jan Mares Miroslava Palikova Radovan Kopp Stanislav Navratil & Jiri Pikula 《Aquaculture Research》2009,40(2):148-156
The present study evaluated the effect of naturally developing cyanobacteria on the composition of muscles of two commercially important freshwater fish species. Fish were exposed to cyanobacterial biomass including Microcystis aeruginosa and Microcystis ichthyoblabe for 4 weeks. Then, they were transferred to dechlorinated potable water without any cyanobacteria for another 4-week period, thus modelling their preparation for consumers. Samples of muscles were collected every week during exposure and subsequent stay in dechlorinated potable water. The cyanobacterial water bloom of 3.9–6 × 105 cells mL−1 (133–383 μg g−1 of total MC DW) induced statistically significant effects only in the content of fatty acids ( P <0.05; P <0.01) in the common carp ( Cyprinus carpio ), while all studied parameters including the content of dry matter and fat ( P <0.01), proteins ( P <0.05), fatty acid composition ( P <0.05; P <0.01) and some amino acids ( P <0.05) were affected in the silver carp ( Hypophthalmichthys molitrix ). This study has shown that cyanobacteria in the environment of commercially produced fish may decrease the dietetic value of fish muscles. 相似文献
5.
Milica Marković Tea Zuliani Snežana Belanović Simić Zorana Mataruga Olga Kostić Snežana Jarić Janja Vidmar Radmila Milačič Janez Ščančar Miroslava Mitrović Pavle Pavlović 《Journal of Soils and Sediments》2018,18(12):3404-3414
Purpose
Riparian zone contamination is a growing problem for several European catchments due to high anthropogenic pressures. This study investigates As, Cd, Cr, Cu, Ni, Pb, and Zn concentrations in the Sava River riparian zone, characterized by wide agricultural areas, various geological substrates, and different types of industrial pollution. The accumulation and mobility of these elements were studied because they are listed as priority substances in the Water Framework Directive and environmental objectives for surface waters.Materials and methods
Sampling was performed during the sampling campaign of the EU 7th FW-funded GLOBAQUA project in September 2015 during a low-water event. Soil samples were collected along the Sava River at 12 selected sampling sites, from a depth of 0–30 cm, at a distance of 10–15 m from the river bank. The extent of pollution was estimated by determining total and readily soluble element concentrations in the soils. Potential ecological risk and the source of the selected elements in the soils was determined using the enrichment factor (EF), potential ecological risk index (RI), and statistical methods such as the principal component analysis (PCA) and multiple linear regression analysis (MLRA).Results and discussion
This study showed that concentrations of the selected elements increase along the Sava. In terms of origin, PCA and MLRA indicated that Cr and Ni in soils are predominantly lithogenic, while As, Cd, Pb, and Zn are both lithogenic and anthropogenic (ore deposits, industry, and agriculture). PCA singled out Cu since its origin in soil is most probably from specific point-source pollution. EF was generally minor to moderate for most of the examined elements, apart from Cu, for which the EF was significant at one sampling site. Overall ecological risk (RI) fell within the low-risk category for most sites, apart from Belgrade sampling site (BEO), where high total Cd content affected individual and overall ecological risk indicators, indicating Cd could represent a considerable ecological risk for the downstream riparian zone.Conclusions
At downstream sites, there was a noticeable increase in PTE content, with Cd, Cr, Ni, and Zn exceeding the proposed threshold values for European soils, indicating rising contamination in riparian soils. In terms of the ecological risk, only Cd could pose a potential ecological threat for the downstream riparian zone.6.
Hafsa Jamshaid Rajesh Mishra Jiri Militky Miroslava Pechociakova Muhammad Tayyab Noman 《Fibers and Polymers》2016,17(10):1675-1686
Composites based on pure Basalt and Basalt/Jute fabrics were fabricated. The mechanical properties of the composites such as flexural modulus, tensile modulus and impact strength were measured depending upon weave, fiber contents and resin. Dynamic mechanical analysis of all composites were done. From the results it is found that pure basalt fiber combination maintains higher values in all mechanical tests. Thermo-gravimetric (TG/DTG) composites showed that thermal degradation temperatures of composites shifted to higher temperature regions compared to pure jute fabrics. Addition of basalt fiber improved the thermal stability of the composite considerably. Scanning electron microscopic images of tensile fractured composite samples illustrated that better fiber-matrix interfacial interaction occurred in hybrid composites. The thermal conductivity of composites are also investigated and thermal model is used to check their correlation. 相似文献
7.
Jiří Kamler Miloslav Homolka Miroslava Barančeková Jarmila Krojerová-Prokešová 《European Journal of Forest Research》2010,129(2):155-162
Browsing of overabundant free-living herbivores often limits the natural as well as artificial regeneration of forest in Central-European
Mountains. The aim of the study was to assess the efficiency of the extensive reductions of herbivore populations for protection
of forest regeneration in preferred areas. We analysed the relationship between the intensity of shoot browsing and relative
density of herbivores in viewpoint of natural regeneration of secondary mountain spruce stands with low proportion of broadleaved
trees in Králicky Sněžník Reserve (Czech Republic). The distribution of seasonally migrating herbivores was established by
counting faecal pellet groups (standing crop method) in growing season. The intensity of browsing of spruce, beech and rowan
was assessed using the proportion of browsed shoots on individual tree sapling. Density of red deer was re-counted from the
number of pellet groups and it was 15–56 individual/km2. The intensity of spruce browsing was low in the whole area in all seasons. In general, the intensity of rowan and beech
shoot browsing was high in the whole area. There were no correlations between deer density and browsing intensity of rowan
(browsing was severe in all plots). We conclude that the natural regeneration of attractive trees and shrubs is nearly impossible
in habitats where proportion of these food items is too small, even when the density of herbivores is low. Reduction of herbivores
density is useful for protecting spruce and other tree species with low preference by herbivores. Forest managers should take
into account the high palatability of deciduous tree species and distribution of herbivores on localities. Preference of localities
is often based on grasses in the food supply. Regeneration of highly palatable tree species requires both low density of herbivores
and sufficient protection of saplings. 相似文献
8.
Marcela Capcarova Peter Hascik Miroslava Kacaniova Gabriel Pal 《Research in veterinary science》2011,91(1):132-137
The aim of this work was to investigate the effect of probiotic preparation with multi-strains composition (Lactobacillus delbrueckii ssp. bulgaricus LAT 187, Lactobacillus acidophilus LAT 180, Lactobacillus helveticus LAT 179, Lactobacillus delbrueckii ssp. lactis LAT 182, Streptococcus thermophilus LAT 205 and Enterococcus faecium E 253) on internal milieu, antioxidant status and body weight of broiler chickens. Chickens were divided into three groups (C, control; E1 and E2, experimental groups). Experimental chickens received the probiotic preparation in drinking water. Probiotic preparation caused a significant increase of serum calcium and potassium content. In the group with higher dose of probiotic strains serum triglycerides level decreased. Total antioxidant status in groups with addition of probiotic strains showed higher values in comparison to control group. Serum albumin level was found to increase after consumption of probiotic preparation in group with higher dose of probiotic strains. Probiotic strains improved body weight in last observed weeks of feeding. 相似文献
9.
Miroslava Rakocevic Maria Brigida Scholz Dos Santos Cintia Sorane Good Kitzberger 《International Journal of Fruit Science》2018,18(2):117-137
ABSTRACTCoffee trees show the fluctuation in production related to biannual phenological development. We aimed to quantify the berry distribution over the vertical profile and relate the chemical composition of coffee beans during few subsequent harvests in each of two production years (PY). The analyzed coffee productions followed severe pruning of plants grown in different planting designs. In the second PY, coffee plants loaded roughly fourfold more berries than the first PY. In the first PY, berry distribution in zones of plagiotropic axes that passed all physiological phases was characterized by random maturation over three harvests, while in the second PY, berry maturation over the orthotropic and plagiotropic axes differed between two harvests, suggesting higher impact of local light microclimate and, consequently, local source–sink relations. Proteins, sucrose, and lipids were the most sensitive studied chemical components when modifications in coffee beans composition were analyzed, considering the impacts of PY, harvest time, planting design, and berry position. Sucrose content increased in latter harvests, indicating better berry maturation compared to the first harvest in both PY. Protein and caffeine contents increased and lipids decreased in higher density and low plant layer during the second PY, suggesting that deposition of those components was modified by self-shading and maturation time related to the berry position over the plant profile. 相似文献
10.
Rostislav Zemek Miroslava Kurowská Ludmila Kameníková Gabriela Zemková Rovenská Jiří Havel František Reindl 《Journal of pest science》2005,78(2):115-116
Caraway (Carum carvi L.) belongs to the traditional crops which have been grown in Bohemia since the end of the 19th century. Depressaria daucella (Denis and Schiffermüller) and Aceria carvi Nal. are two main pests of caraway in the Czech Republic. The latter becomes a serious problem in major caraway-growing areas. So far, no effective method for its control is known. The aim of this paper is to describe the phenology of symptoms of A. carvi infestation and damage caused by this pest. Our observation revealed that although A. carvi overwinters hidden within leaves of young caraway plants, the first symptoms are usually not visible before the start of flowering. Though the initial density of the pest is low, the mite population multiplies during the season when the pest attacks plant tissues and causes development of galls on leaves and flowers. Comparison of healthy plants and plants infested by A. carvi showed that infested plants had significantly more umbels but produced far fewer seeds, and the yield of caraway was thus substantially decreased. Recommendations for crop management methods to suppress the pest are given.Electronic Supplementary Material Supplementary material is available for this article at 相似文献