Search results for "WOOD"
showing 10 items of 818 documents
Test procedures for obtaining representative extracts suitable for reliable in vitro toxicity assessment of paper and board intended for food contact.
2009
International audience; This paper describes the use of a suite of extraction procedures applicable to the assessment of the in vitro toxicity of paper/board samples intended for food-contact applications. The sample is extracted with ethanol, water, or exposed to modified polyphenylene oxide (Tenax) for fatty, non-fatty and dry food applications, respectively. The water extracts are directly suitable for safety assessment using in vitro bioassays. The ethanol extracts of the paper/board and of the exposed Tenax require pre-concentration to give acceptable sensitivity. This is because the in vitro bioassays can tolerate only a small percentage of added organic solvent before the solvent its…
Dissolution of resin acids, retene and wood sterols from contaminated lake sediments.
2005
The dissolution potency of hydrophobic resin acids (RAs), retene and wood sterols from sediments was studied. These wood extractives and their metabolites are sorbed from pulp and paper mill effluents to downstream sediments. With harmful components like these, sediments can pose a hazard to the aquatic environment. Therefore, sediment elutriates with water were produced under variable conditions (agitation rate and efficiency, time), and concentrations of the dissoluted compounds were analyzed. Both naturally contaminated field sediments and artificially spiked sediments were studied. By vigorous agitation RAs can be released fast from the sediment matrix and equilibrium reached within 3 d…
Expression of the Vitellogenin Gene in the Liver of Juvenile Whitefish (Coregonus lavaretus L. s.l.) Exposed to Effluents from Pulp and Paper Mills
1999
Juvenile whitefish (Coregonus lavaretus L. s.l.) were exposed by caging in the field to diluted effluents from three operating pulp, paper, and paperboard mills in Southern Lake Saimaa, Finland. The expression of the vitellogenin gene, used as a biomarker of estrogenic contamination of effluents, was measured using a Northern blotting method. Increased mRNA levels, the most specific and reliable evidence for estrogen receptor-mediated actions in vivo, were found in fish caged in the vicinity of one of three mills studied. This mill was found to discharge wood-derived compounds, such as sterols and resin acids, into Lake Saimaa in amounts considerably exceeding those from the other two mills…
Adaptive plasticity of blue tits(Parus caeruleus)and great tits(Parus major)breeding in natural and semi‐natural insular habitats
2004
The breeding performance and foraging of blue and great tits, and the abundance of arthropods living on the trees of an oak-wood and of a coniferous reafforestation were studied in Sicily, in order to: 1) compare breeding parameters in natural and semi-natural habitats within the same area; 2) estimate the degree of overlap in peak resource and peak demand of young tits, and the overlap of nestling diet of the two species in the two habitats. Both species had earlier laying dates, laid more eggs and raised more fledglings in the oakwood than in the reafforestation; they achieved the same fledging success within the same habitat type. These differences are probably due to the earlier and hig…
Great tit (Parus major) breeding in fire-prone oak woods: differential effects of post-fire conditions on reproductive stages
2011
Wildfires negatively affect the overall reproductive success of several woodland avian species, but there is scarce information about which stages of the nesting cycle are specifically affected. We conducted a 3-year study to identify the effects of fire on the reproductive parameters of the great tit (Parus major) and the survival of its nests at different stages of the nesting cycle. We recorded the occupancy rate, clutch and brood size, hatching, fledging and nesting success in nest boxes placed on study plots with different post-fire age. By examining the post-fire succession, we analysed the survival of eggs and nestlings under predation risks. As the forest matured after a wildfire, …
Pedicularis sylvatica L. (19. Jahrhundert)
1847
3 meža jāņeglītes 19. gadsimta eksikāti. 1.attēls - legit Neuman; 2.attēls - legit Neuman, atradne "Germania"; 3.attēls - ievākts 1847. gadā. / 3 Wald-Läusekraut Herbarien aus dem 19. Jahrhundert. Bild 1 - legit Neuman; Bild 2 - legit Neuman, Hinterlegung "Germania"; Bild 3 - in Jahre 1847 gesammelt. / 3 19th century wood lousewort's herbariums. Picture 1 - legit Neuman; Picture 2 - legit Neuman, deposit "Germania"; Picture 3 - collected in 1847. [Attēli no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1371)]
Meža jāņeglītes pirmais atradums Latvijā
2021
Raksts veltīts Latvijā reti sastapta auga meža jāņeglītes Pedicularis sylvatica atradumiem Latvijas teritorījā, izceļot tās pirmo atradumu, ko 1923. gadā veica latviešu botāniķis Pauls Galenieks (1891 - 1962). Rakstā sniegta informācija par meža jāņeglītes herbārijiem Latvijas Universitātes muzejā.
Pedicularis sylvatica L. (P. Lackschewitz)
1928
Paula Lakševica 1928. gadā Rucavā ievāktie meža jāņeglītes exikāti. / Die Exikte des Wald-Läusekraut, die 1928 in Rucava Paul Lackschewitz gesammelt wurden. / Wood lousewort's Exicts, were collected in Rucava Paul Lackschewitz in 1928. [Attēli no LU Muzeja kolekcijas Herbarium Lackschewitzi (RIG III); (BOT12097)]
Pedicularis sylvatica L. (P. Galenieks)
1923
Meža jāņeglītes pirmais atradums Latvijā. Atradne Kurzemē, Rucavā starp Visminu un Zirnāju Vizuļu mājām gar kalnu, sausā vietā. / Wood lousewort's first find in Latvia. A deposit in Kurzeme, Rucava between Visminas and Zirnāji Vizuļi houses along the mountain, in a dry place. [Attēls no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1371)]
Pedicularis sylvatica L. (K.R. Kupffer)
1923
Meža jāņeglītes pirmais atradums Latvijā. Atradne Kurzemē, Rucavā starp Visminu un Zirnāju Vizuļu mājām sausā vietā pļavas malā. Aprakstījis un K. R. Kupferam nodevis Nikolajs Malta. / Wald-Läusekraut erster Fund in Lettland. Gefunden in Kurland, Rutzau, Wiese zwichen Wismini und Zirnaju Visuli an trockenen Stelle am Rand den Wiese. Beschrieben und an K. R. Kupfer von Nikolai Malta übergeben. / Wood Lousewort's first find in Latvia. A deposit in Kurzeme, Rucava between Vismini and Zirnāji Vizuļi houses in a dry place at the edge of the meadow. Described and handed over to K. R. Kupfer by Nikolai Malta. [Attēls no LU Muzeja kolekcijas Herbarium Balticum (RIG I); (BOT2767)]