Browsing Scientific Publications in Natural Sciences by Issue Date
Now showing items 1-20 of 374
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Quantitative importance of staminodes for female reproductive success in Parnassia palustris under contrasting environmental conditions.
(Journal article; Peer reviewed, 2003)The five sterile stamens, or staminodes, in Parnassia palustris act both as false and as true nectaries. They attract pollinators with their conspicuous, but non-rewarding tips, and also produce nectar at the base. We ... -
Effects of simulated environmental changes on growth and growth form in a late snowbed population of pohlia wahlenbergii (Web. et Mohr) Andr
(Journal article; Peer reviewed, 2003)In a factorial field experiment we increased the temperature (OpenTop Chambers) and nutrients (nitrogen, phosphorus, and potassium[NPK]) to simulate predicted future climate changes and studiedthe growth response of the ... -
Thermal induction of 9t12t linoleic acid: A new pathway for the formation of Conjugated Linoleic Acids
(Journal article; Peer reviewed, 2009)Thermal induction of 9t12t fatty acid leading to the formation of Conjugated Linoleic Acids (CLA) has been demonstrated by subjecting glyceride, and methyl ester of the acid to heat treatment. Fifteen micro liter portions ... -
Evidence in the formation of conjugated linoleic acids from thermally induced 9t12t linoleic acid: a study by gas chromatography and infrared spectroscopy
(Journal article; Peer reviewed, 2009)Thermally induced isomerisation leading to the formation of conjugated linoleic acids (CLAs) has been observed for the first time during the thermal treatment of 9t12t fatty acid triacylglycerol, and methyl ester. Fifteen ... -
Thermal degradation and isomerisation kinetics of triolein studied by infrared spectrometry and GC-MS combined with chemometrics
(Journal article; Peer reviewed, 2009)Triolein, a triglyceride containing oleic acid as the only acid moiety in the glyceride molecules has been isothermally treated at 280,300,and 325 degrees C in glass vials under nitrogen atmosphere. The products formed ... -
Thermally Induced Isomerization of Trilinolein and Trilinoelaidin at 250 A degrees C: Analysis of Products by Gas Chromatography and Infrared Spectroscopy
(Journal article; Peer reviewed, 2009)The products formed by thermally induced isomerization of trilinolein and trilinoelaidin at 250 A degrees C were studied by infrared spectroscopy and gas chromatography. The triglycerides of the 9c12c and 9t12t fatty acids, ... -
Isomerization of 9c11t/10t12c CLA in Triacylglycerols
(Journal article; Peer reviewed, 2010)Isomers of conjugated linoleic acid from 7t9c through 12t14t can be induced by thermal treatment of triacylglycerol samples of 9c11t or 10t12c fatty acids in glass tubes. The formation of conjugated linoleic acids (CLAs) ... -
New insights into the surface functionalities and adsorption evolution of water molecules on silica gel surface: A study by second derivative near infrared spectroscopy
(Journal article; Peer reviewed, 2010)Surface functionalities and adsorption evolution of water molecules on silica gel samples were studied by second derivative near infrared spectroscopy. Four different silica gel samples with varying surface area were used ... -
The Fate of Phthalates in Surface Waters During Humus Removal by Precipitation
(Journal article; Peer reviewed, 2010)Phthalates are esters of aromatic 1,2 di-carboxylic acids and are widely found in surface waters and their removal is necessary because of their effects on human health. Humic material in water can adsorb phthalates and ... -
Socializing makes thick-skinned individuals: On the density of epidermal alarm substance cells in cyprinid fish, the crucian carp (Carassius carassius)
(Journal article; Peer reviewed, 2010)In cyprinid fish, density of epidermal club cells (i.e. alarm substance cells) has been found to vary between lakes with different predator fauna. Because predators can be labelled with chemical cues from prey, we questioned ... -
Water Chemistry in the Confluence Zone Downstream a Limestone Treated Lake and an Acid Tributary: Principal Component Analyses Including Warm and Cold Winters and an Episode High in Sea-Salts
(Journal article; Peer reviewed, 2010)Extensive limestone treatment of lakes and watercourses has been carried out especially in Norway and Sweden to counteract effects of acidification. Lakes have been the most commonly treated part of the water systems. ... -
Challenging fear: Chemical alarm signals are not causing morphology changes in crucian carp (Carassius carassius)
(Journal article; Peer reviewed, 2010)Crucian carp develops a deep body in the presence of chemical cues from predators, which makes the fish less vulnerable to gape-limited predators. The active components originate in conspecifics eaten by predators, and are ... -
Thermally Induced Isomerisation Kinetics of the 9c11t and 10t12c Conjugated Linoleic Acids in Triacylglycerols as Studied by FT-IR Spectrometry Aided by Gas Chromatography
(Journal article; Peer reviewed, 2010)Isomerisation kinetics of the 9c11t and 10t12c Conjugated Linoleic Acids (CLA) in triaclglycerols at isothermal conditions (250, 280 and 325oC) has been studied by infrared spectroscopy. Fifteen micro liter portions of ... -
Borrelia burgdorferi sensu lato in Ixodes ricinus ticks collected from migratory birds in Southern Norway
(Journal article; Peer reviewed, 2010)BACKGROUND:Borrelia burgdorferi sensu lato (s.l.) are the causative agent for Lyme borreliosis (LB), the most common tick-borne disease in the northern hemisphere. Birds are considered important in the global dispersal of ... -
Near infrared spectroscopic characterisation of surface hydroxyl groups on hydrothermally treated silica gel
(Journal article; Peer reviewed, 2011)Surface hydroxyl groups on hydrothermally treated silica gel have been under discussion several decades back with contradictory conclusions. Some authors meant that the hydrothermally treated sila gel increases the ... -
The use of anthracene as a model compound in a comparative study of hydrous pyrolysis methods for industrial waste remediation
(Journal article; Peer reviewed, 2011)Polycyclic aromatic hydrocarbons are very stable compounds and tend to bioaccumulate in the environment due to their high degree of conjugation and aromaticity. Hydrous pyrolysis is explored as a technique for the treatment ... -
Pyrolytic formation of polyaromatic hydrocarbons from steroid hormones
(Journal article; Peer reviewed, 2011)Four steroid hormones, namely androsterone, cholesterol, estrone and estradiol, have been pyrolysed at 300, 400 and 500 °C and the pyrolysates from these have been analysed by GC-MS. The results indicate that these formed ... -
Northern refugia and recent expansion in the North Sea: The case of the wrasse Symphodus melops (Linnaeus, 1758)
(Journal article; Peer reviewed, 2011)Pleistocene climate changes have imposed extreme conditions to intertidal rocky marine communities, forcing many species to significant range shifts in their geographical distributions. Phylogeographic analyses based on ... -
Experimental warming had little effect on carbon-based secondary compounds, carbon and nitrogen in selected alpine plants and lichens
(Journal article; Peer reviewed, 2011)Global warming is expected to change plant defence through its influence on plant primary resources. Increased temperature (T) will increase photosynthesis, and thus carbon (C) availability, but may also increase soil ... -
Spin transport in ferromagnetic/normal-metal tunnel junction arrays
(Journal article; Peer reviewed, 2012)An array of alternating ferromagnetic and normal-metal islands separated by small tunnel junctions is theoretically investigated in the sequential tunneling regime. A numerical Monte Carlo method is used to calculate the ...