Wyniki wyszukiwania - AGRO

1

Magnesium bioavailability of selected cereals originating from ecological farming

100%

Klobukowski J., Sadowski T., Rychcik B.

Journal of Elementology

|

2005

|

tom 10

|

nr 4 Suppl.1

46

2

Bioavailability of trace elements proteinates in pigs

100%

Novotny J., Seidel H., Kovac G., Babcek R.

Medycyna Weterynaryjna

|

2005

|

tom 61

|

nr 01

3

Intact glucosinolates as bioactive food components

88%

Sorensen S., Blok Frandsen H., Sorensen H., Sorensen J. C.

Polish Journal of Food and Nutrition Sciences

|

2011

|

tom 61

|

nr Suppl.1

4

Heavy metal speciation in sewage sludge

88%

Jakubus M., Czekala J.

Polish Journal of Environmental Studies

|

2001

|

tom 10

|

nr 4

Sewage sludge is a rich source of organic matter and nutrients, so there is a possibility of their broader agricultural utilization. However, agricultural utilization of this material is limited by excessive quantities of heavy metals. In accordance with this, the current paper presents the results of investigations referring to the speciation of heavy metals in selected sewage sludge. It was found that there were differences among metals in the preferential formation of bonds, but also such phenomena occurred in the individual sludge samples for the same element. This was mainly observed for cadmium and nickel. Especially important are the amounts of metals associated with water soluble plus exchangeable fraction (1 mol.L-1 NH4NO3) as well as fraction of metals extracted by 1 mol.L-1 NH4OAc (pH = 6.0), corresponding to weakly adsorbed and bound with carbonates and labile organic compounds. With reference to this, it was stated that the percentage share of such combinations decreased in the order: Cu < Cr < Zn < Cd < Ni, reaching values of 2.9, 7.2, 8.8, 19.5 and 21.6% respectively. It shows those copper forms the lowest number of fast released combinations, whereas Ni and Cd - the highest.

5

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Mercury fluxes through the sediment water interface and bioavailability of mercury in Southern Baltic Sea sediments

75%

Beldowski J., Miotk M., Pempkowiak J.

Oceanologia

|

2009

|

tom 51

|

nr 2

263-285

Sediment cores collected in several areas of the southern Baltic were analysed for total mercury (HgTOT) and five operationally defined mercury fractions: HgA – contained in pore waters, HgF – bound to fulvic acids, HgH – bound to humic acids, HgS – bound to sulphide, and HgR – residual. An effort was made to quantify mercury fluxes at the sediment/water interface in the study area. Net mercury input, calculated on the basis of sedimentation rate and concentration in the uppermost sediments, ranged from 1 to 5.5 ng cm−2 year−1. Mercury remobilisation from sediments due to diffusion and resuspension was calculated from the proportion of labile mercury and the velocity of near-bottom currents. The results showed that the return soluble and particulate fluxes of mercury from the sediments to the water column constitute a substantial proportion of the input (20–50%), and are slightly higher than those found in pristine areas, although they are less than the values recorded in areas with a history of mercury contamination. In addition, an index was developed to assess the methylation potential of mercury in sediments. Mercury contained in pore waters, and mercury bound to fulvic and humic acids together with Loss on Ignition were used to calculate the semiquantitative methylation potential (Pm). Despite the simplicity of this approach, Pm correlates well with methyl mercury in fish from the study area.

6

The influence of selected hypotensive drugs on the bioavailability of minerals from buckwheat groats in vitro enzymatic digestion

75%

Saliburska J., Bogdanski P., Chiniewicz B.

Acta Scientiarum Polonorum. Technologia Alimentaria

|

2011

|

tom 10

|

nr 4

Background. The mineral status in hypertensive patients may be affected by hypotensive drugs. The aim of this study was to estimate the influence of hypotensive drugs (angiotensine converting enzyme inhibitors (ACE-I), P-blockers, Ca-antagonists, diuretics) on the potential bioavailability of magnesium, iron, zinc and copper from buckwheat groats in vitro enzymatic digestion. Material and methods. The degree of release of magnesium, iron, zinc and copper from buckwheat groats was determined with and without (the control sample) an addition of hypotensive drugs. Four antihypertensive drugs in one dose (one tablet per sample) were analysed: metocard (a (3-blocker), cardilopin (a Ca-antagonist), apo-perindox (ACE-I) and indapen (a diuretic). The samples were subjected to enzymatic digestion under in vitro conditions. The content of minerals in buckwheat groats before and after enzymatic digestion was determined by flame atomic absorption spectrometry (AAS). Results. It was found that cardilopin (amlodipine) and indapen (indapamide) significantly increased the release of zinc from groats. The degree of release of magnesium was higher and the release of iron was lower in samples with apo-perindox (perindopril) than in the control group. The release of copper was significantly decreased by indapen (indapamid). Conclusions. Amlodipine, perindopril and indapamide affected the release of magnesium, iron, zinc and copper from buckwheat groats in vitro enzymatic digestion.

7

Vegetable as a source of carotenoids

75%

Bogacz-Radomska L., Harasym J.

Nauki Inżynierskie i Technologie

|

2016

|

nr 4(23)

Plants are rich and still unexploited sources of bioactive compounds, attractive for their therapeutic properties and as the raw material for the formulation of pharmaceutical and food products. The colour of the plants, especially comestibles as vegetables or fruits, results from chemical compounds whose metabolic activity is the aim of many studies nowadays. The carotenoids, a group of organic compounds with an unsaturated skeleton of hydrocarbons, results in the colours of yellow, orange and red. Having antioxidant activity and, for some of them, being the precursors to vitamin A in the animal organisms are willingly used in very different medical applications. The article describes the current state of knowledge regarding the types and quantities of carotenoids in vegetables, the advancement of knowledge of their metabolic impact, their possible applications in medicine, as well as the desired directions for further research. Also, the scope of their industrial use and the prospects of carotenoids’ market development are included. This work is carried out in the framework of the COST Action – EUROCAROTEN CA15136, with the aim of the exchange and development of knowledge between European researchers working on carotenoids.

8

Bioavailability of anthocyanins from red cabbage products

75%

Wiczkowski W., Topolska J., Szawara-Nowak D., Ornatowska A., Piskula M. K.

Polish Journal of Food and Nutrition Sciences

|

2011

|

tom 61

|

nr Suppl.1

9

Effects of repeated applications of sewage sludge and MSW compost on the bioavailability of heavy metals in greenhouse soil

75%

Topcuoglu B.

Polish Journal of Environmental Studies

|

2005

|

tom 14

|

nr 2

In a two-year study, manure, sewage sludge and MSW compost were applied to greenhouse soil. A tomato plant was grown. Soil samples were collected after harvest and total and DTPA-extractable Zn, Cu, Ni, Pb and Cd contents of greenhouse soil were determined. Sludge and MSW compost used in a 2-year period increased both total and DTPA-extractable concentrations of Zn, Cu, Ni and Pb in the greenhouse soil. Cd increase was detected only in “total” form in the second year, by sewage sludge and MSW compost treatments. Bioavailable Cd content of soil was found below the detection limit in all treatments. The amount of bioavailable metals in the greenhouse soil were significantly high for the sewage sludge and MSW compost treatments, almost including a 9-, 6- and 3-fold increase in Zn, Cu and Pb, respectively. Total and bioavailable metal contents of soil in sewage sludge and MSW compost applications were higher in comparison with manure application. In sewage sludge and MSW compost treatments, “total” concentrations of all metals were found below pollutant limits, but the increase in available fractions was more marked than those of total concentrations.

10

Influence of physicochemical properties of soil on Mn bioavailability

75%

Halasova M., Vollmannova A., Tomas J.

Biuletyn Magnezologiczny

|

2001

|

tom 06

|

nr 3

Manganese contents in various extracts (2 M HN03, 0.05 M EDTA and 0.01 M CaCl2) and total Mn content in soil samples of various soil types from 6 regions of Slovakia were determined. After simulated loading the Mn extraction in 2 M HN03 decreased in order Lgp > Hcf > Jc Chc > Lga > Rc. The same order was also in 0.05 M EDTA and 0.01 M CaCl2. The results showed that Mn extractability is significantly determined by physicochemical soil properties (soil reaction, humus content and quality). Acid soils with a low humic acid content and high fulvoacid content appeared to be the highest risk soils.

11

Effect of various selenium sources on selenium bioavailability, chicken growth performance, carcass characteristics and meat composition of broiler chickens

63%

Kinal S., Krol B., Tronina W.

Electronic Journal of Polish Agricultural Universities. Series Veterinary Medicine

|

2012

|

tom 15

|

nr 1

12

Seasonal assessment of biological indices, bioaccumulation and bioavailability of heavy metals in mussels Mytilus galloprovincialis from Algerian west coast, applied to environmental monitoring

63%

Rouane-Hacene O., Boutiba Z., Belhaouari B., Guibbolini-Sabatier M. E., Francour P., Risso-de Faverney R.-d.

Oceanologia

|

2015

|

tom 57

|

nr 4

13

In vivo cardioprotective effects and pharmacokinetic profile of N-propyl caffeamide against ischemia reperfusion injury

63%

Cheng Y.-Y., Luo D., Xia Z., Tse H.-F., Li X., Rong J.

Archivum Immunologiae et Therapiae Experimentalis

|

2017

|

tom 65

|

nr 2

14

Pharmacokinetics of tramadol and metabolites after injective administrations in dogs

63%

Giorgi M., Del Carlo S., Lebkowska-Wieruszewska B., Kowalski C. J., Saccomanni G.

Polish Journal of Veterinary Sciences

|

2010

|

tom 13

|

nr 4

The aim of this study was to determine the pharmacokinetics of tramadol and its main metabolites after IV and IM injections. The pharmacokinetic cross-over study was carried out on 6 healthy male beagle dogs. Tramadol was administered by intravenous (IV) and intramuscular (IM) injection at 4 mg/kg. Tramadol and its main metabolites O-desmethyl-tramadol (M1), N-,N-didesmethyl-tramadol (M2) and N-,O-didesmethyl-tramadol (M5) concentrations were measured in plasma samples by a HPLC coupled with fluorimetric detection; pharmacokinetic evaluations were carried out with a compartmental and non-compartmental model for tramadol and its metabolites, respectively. The bioavailability of the drug, ranging between 84-102% (mean 92%), was within the generally accepted values for a positive bioequivalence decision of (80-125%). After the IM injection the mean plasma drug concentration peak was reached after a Tmax of 0.34 h with a Cmax of 2.52 μg/mL. No therapeutic relevant differences were observed between IM and IV administration. The minimal effective plasma concentration was reached after a few minutes and maintained for about 6-7 h in both administrations. M1 plasma concentration was low and the amounts of the other metabolites produced were analogous in both routes of administration. In conclusion, tramadol was rapidly and almost completely absorbed after IM administration and its systemic availability was equivalent to the IV injection. The different onset time and duration of action observed were very small and probably therapeutically irrelevant. The IM injection is a useful alternative to IV injection in the dog.

15

Study of antioxidant activity of liposomal forms of quercetin and curcumin in ischemic heart disease

63%

Pylypenko D., Gorbach T., Krasnopolsky Y.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

|

2020

|

tom 101

|

nr 4

16

Bioavailability of zinc in different chemical forms for lambs and its influence on copper retention

63%

Slupczynska M., Kinal S.

Polish Journal of Natural Sciences. Supplement

|

2006

|

tom 03

235-241

17

Green tea extracts lower serum folates in rats at very high dietary concentrations only and do not affect plasma folates in a human pilot study

63%

Augustin A., Frank J., Augustin S., Langguth P., Ohrvik V., Witthoft C. M., Rimbach G., Wolffram S.

Journal of Physiology and Pharmacology

|

2009

|

tom 60

|

nr 3

103-108

Green tea catechins (GTC) have been shown to inhibit the activities of enzymes involved in folate uptake. Hence, regular green tea drinkers may be at risk of impaired folate status. The present experiments aimed at studying the impact of dietary GTC on folate concentrations and metabolism. In a human pilot study (parallel design) healthy men consumed for 3 weeks 6 capsules (~670 mg GTC) per day (2 capsules with each principal meal) containing aqueous extracts of the leaves of Camellia sinensis (n=17) or placebo (n=16). No differences in plasma folate concentrations were observed between treatments. We further fed groups of 10 male rats diets fortified with 0, 0.05, 0.5, 1, or 5 g GTC/kg for 6 weeks. Only at the highest intake, GTC significantly decreased serum 5-methyl-tetrahydrofolate concentrations in rats, while mRNA concentrations of reduced folate carrier, proton-coupled folate transporter/heme carrier protein 1, and dihydrofolate reductase (DHFR) remained unchanged in intestinal mucosa. Using an in vitro enzyme activity assay, we observed a time- and dose-dependent inhibition of DHFR activity by epigallocatechin gallate and a green tea extract. Our data suggest that regular green tea consumption is unlikely to impair folate status in healthy males, despite the DHFR inhibitory activity of GTC.

18

The role of planktonic organisms in urea metabolism in lakes of temperate zone – case study

63%

Siuda W., Chrost R. J., Kalinowska K., Ejsmont-Karabin J., Kiersztyn B.

Polish Journal of Ecology

|

2016

|

tom 64

|

nr 4

Although urea is the simplest N-containing organic compound ubiquitous in all aquatic environments, its role in N-nutrition of planktonic biota and relevance for eutrophication of freshwater ecosystems is still insufficiently defined and often bypassed. The dynamics of production of autochthonous urea as well as maximal potential net ureolytic activity (net URA Vmax) of phyto- and bacterioplakton were studied in mesocosm experiment and verified during the field studies conducted in the Great Mazurian Lake system (GMLS). Analysis of the obtained results revealed that the proteins were the main autochthonous urea precursors. Urea concentration in the studied mesocosms and in GMLS surface waters was positively correlated with flagellate, ciliate and crustacean biomass and, less evidently, with bacterial biomass (BB). In surface waters of GMLS net URA Vmax, similarly as urea concentrations, increased with their trophic status. Analysis of correlation of potential ureolytic activity with chlorophyllₐ, (Chlₐ) BB and L-leucine aminopeptidase activity (AMP) in lakes of different trophic status suggests that although both groups of planktonic microorganisms participated in urea decomposition processes, in eutrophic ones bacterial decomposition of urea is more evident. In highly eutrophic lakes excess of phosphorus induced higher nitrogen requirement resulting in the increase in protein decomposition rate. Intensified protein degradation resulted faster urea production, which finally induced higher ureolytic activity of planktonic microorganisms. In profundal waters of GMLS potential ureolytic activity was distinctly lower than in surface waters. This was caused by low temperature of hypolymnetic waters, inhibitory effect of hydrogen sulphide and lack of phytoplankton, which is known as a primary urea consumer.

19

Distribution, bioavailability and fractionation of metallic elements in allotment garden soils using the BCR sequential extraction procedure

63%

Bielicka-Gieldon A., Rylko E., Zamojc K.

Polish Journal of Environmental Studies

|

2013

|

tom 22

|

nr 4

Metal associated with urban soils are of environmental concern due to their direct and indirect effects on human health. Metallic elements in contaminated soils are absorbed by plants and undergo biomagnification in the food chain. Allotment gardens are often situated in city centers and in areas with strong anthropogenic pressure – e.g. near industrial plants and roads. The aim of this study was to identify the bioavailable forms of metals present in urban soils. The sequential extraction procedure was applied to fractionate the following metals in urban soil samples from allotment gardens in Koszalin, Poland: chromium, copper, iron, manganese, nickel, lead, cadmium, and zinc. The mobility of the metals from studied soils decreased in the order: Cd > Mn > Pb > Zn > Ni > Cr > Cu > Fe. The sum of particular metals in the bioavailability fractions BCR I-III was: Cd 77-89%, Mn 72-81%, Pb 64-80%, Zn 54-77%, Ni 31-57%, Cr 32-53%, Cu 20-50%, and Fe 12-17%.

20

Melatonin decreases homocysteine level in blood of rats

63%

Murawska-Cialowicz E., Januszewska L., Zuwala-Jagiello J., Milczarska J., Zawadzki M., Paprocka-Borowicz M., Wierzbicka-Damska I.

Journal of Physiology and Pharmacology

|

2008

|

tom 59

|

nr 4

717-729

Elevated plasma homocysteine level promotes atherosclerosis in blood vessels due to, among others, generation of reactive oxygen species and reduction of nitric oxide bioavailability. The aim of this study was to investigate whether melatonin administration reduces plasma homocysteine level in rats consuming increased doses of methionine in the diet. The trial lasted for two months. The rats were divided into a few groups - 2 groups consisted of animals fed a standard diet, 2 groups consisted of animals fed a diet rich in methionine for one and two months, a group which had methionine removed from the diet in the second month, a group which had methionine removed from the diet and melatonin administered in the second month, a group still fed a diet rich in methonine in the second month and also given melatonin, and a group of animals on a diet rich in methionine for two months and given melatonin at the same time. Hcy, lipid peroxidation markers (MDA+4HNE) and nitric oxide metabolite (NO2-/NO3-) concentrations were determined in the plasma of all the rats. As a result of the tests it was found that plasma Hcy concentration increases in the first month of a methionine-rich diet but then decreases in the second month. MDA+4HNE changes are similar. Melatonin significantly intensifies the effects. The changes of NO2-/NO3- concentrations were noticed especially in the groups receiving melatonin. Elimination of methionine from the feed does not change the value of NO2-/NO3-. NO production increases only after administration of melatonin. On the basis of received results it might be stated that melatonin administration together with a methionine-rich diet significantly decreases Hcy concentration, the level of oxidative stress and increases NO production. It might have some practical implications, especially when the level of endogenous melatonin decreases e.g. in elderly people or people with hyperhomocysteinemia.

Ograniczanie wyników