investigations of lake umbozero, the second largest and the deepest lake of the murmansk region, were carried out to detect and define biogeochemical patterns of distribution of the chalcophile elements (hg, cd, pb, as) in water, sediments and organs and tissues of whitefishes. lake umbozero is affected by emissions and effluents from mining and metallurgical enterprises of the murmansk region,...

The molecular composition and origin has recently been demonstrated to play a critical role in the persistence of organic matter in lake water, but it is unclear to what degree chemical attributes and sources may also control settling and burial of organic matter in lake sediments. Here we compared the annual contribution of allochthonous and autochthonous sources to the organic matter settling...

The concentrations of organic carbon (OC) and CaCO 3 in lake sediments are often inversely related. This relation occurs in surface sediments from different locations in the same lake, surface sediments from different lakes, and with depth in Holocene sediments. Where data on accumulation rates are available, the relation holds for organic carbon and CaCO 3 accumulation rates as well. An increa...

The reliability of chronology is a prerequisite for meaningful paleoclimate reconstructions from sedimentary archives. The conventional approach of radiocarbon dating bulk organic carbon in lake sediments is often hampered by the old carbon effect, i.e., the assimilation of ancient dissolved inorganic carbon (DIC) derived from carbonate bedrocks or other sources. Therefore, radiocarbon dating i...

Artemia has been widely used in aquaculture as a suitable live food. The presence of highly unsaturated fatty acids is a key factor that determines the nutritional value and marketing of Artemia for shrimp, marine larvae, sturgeon and ornamental fish industries. To determine the variation in nutritional content in cysts, decapsulated cysts and nauplii of Artemia from three different biotopes of...

the lake of urmia, with the length of 128-144km. and the width of 36.8- 50km., is located in north west of iran at the longitude of 38o ,20' and the latitude of 45 ,10. its area is about 6000km .and the average depth of water is about 6 meters reaching to 16 meters at some points. physical and chemical studies made, show that the water of the lake is colorless and has salty taste. its ph i...

Microelectronic Research Labratory of Urmia University i * Corresponding Author, A. Naderi is with the Department of Electronic Engineering, urmia University, Urmia, Iran (e-mail: [email protected]). ii H. Ghasemzadeh, A. Pourazar and M. Aliasghary are with the Department of Electronic Engineering, urmia University, Urmia, Iran (e-mail: [email protected], [email protected], m.al...