Chemical element composition and amphipod concentration function in Baikal littoral zone     

N. N. Kulikova  I. V. Mekhanikova  E. P. Chebykin  E. V. Vodneva  O. A. Timoshkin  A. N. Suturin 《Water Resources》2017,44(3):497-511

Mass-spectrometry with inductively coupled plasma was used to determine the element composition of 19 amphipod species, most of which are widespread in the stony littoral of Lake Baikal. Amphipod composition was found to be dominated by Ca > P ≥ S > K ≥ Na > Cl > Mg > Sr ≥ Br ≥ Si. The concentrations of all elements determined in amphipods is greater than the respective concentrations in water. The amphipods were found to concentrate P > Br > Cu > Zn > Cd to the greatest extent relative to the element composition of water and Br > P ≥ I > Ca > S > Cl ≥ As > Sr relative to that of the stone substrate. The concentrations of Cr, Mn, Fe, Co, Cu, Zn, As, Mo, Cd, Pb, and Hg in 2003–2006 in the amphipods of the stony littoral of Baikal was not greater than their concentrations in the amphipods from conventionally non-polluted or weakly polluted aquatic ecosystems. The obtained results can be used as background values in environmental monitoring.  相似文献   

The Assessment of the Diffuse Pollution from Agricultural Territories in the Upper Volga Basin and the Development of Measures to Reduce It: Case Study of the Yakhroma River     

Kireycheva  L. V.  Lentyaeva  E. A.  Timoshkin  A. D.  Yashin  V. M. 《Water Resources》2020,47(5):709-720

Water Resources - The possible input of nutrients-pollutants into water bodies in the Upper Volga basin from agricultural lands is evaluated for the case of the Yakhroma R. with a basin area of...  相似文献   

Rip brane cosmology from 4d inhomogeneous dark fluid universe     

I. Brevik  V. V. Obukhov  A. V. Timoshkin  Y. Rabochaya 《Astrophysics and Space Science》2013,346(1):267-271

Specific dark energy models with linear inhomogeneous time-dependent equation of state, within the framework of 4d Friedman-Robertson-Walker (FRW) cosmology, are investigated. It is demonstrated that the choice of such 4d inhomogeneous fluid models may lead to a brane FRW cosmology without any explicit account of higher dimensions at all. Effectively, we thus obtain a brane dark energy universe without introducing the brane concept explicitly. Several examples of brane Rip cosmology arising from 4d inhomogeneous dark fluid models are given.  相似文献   

Element Composition and Biogeochemical Functions of Algae Ulothrix Zonata (F. Weber et Mohr) Kützing in the Coastal Zone of the Southern Baikal     

N. N. Kulikova  E. A. Volkova  N. A. Bondarenko  E. P. Chebykin  E. V. Saibatalova  O. A. Timoshkin  A. N. Suturin 《Water Resources》2018,45(6):908-919

ICP-MS method was used to study the element composition of green algae Ulothrix zonata (F. Weber et Mohr) Kützing, sampled in the coastal zone of the Southern Baikal. Dominating in Ulothrix composition are S, Ca, P, Mg and microelements Fe, Al, Ti, Mn, Sr, Ba, Cu, Zn, La, Ce, As, Br, and Pb. The concentrations of all analyzed elements in alga thallomes is greater than the respective concentrations in coastal zone water. The dry mass of U. zonata accumulates more P, As, S, I, Br, Ni, Cd, Ca, and Mg than the stone substrate does. The effect of U. zonata on the formation of element composition of water medium in the coastal zone is demonstrated.  相似文献   

Anthropogenic Changes in the Hydrochemical and Sanitary–Microbiological Characteristics of Water Quality in Southern Baikal Tributaries: Listvennichnyi Bay     

Malnik  V. V.  Timoshkin  O. A.  Suturin  A. N.  Onishchuk  N. A.  Sakirko  M. V.  Tomberg  I. V.  Gorshkova  A. S.  Zabanova  N. S. 《Water Resources》2019,46(5):748-758

Water Resources - A sanitary–bacteriological and hydrochemical survey of rivers flowing into Lake Baikal near Listvyanka Settl. was carried out in period from 2014 to 2015. Water quality at...  相似文献   

Turbulence accelerating cosmology from an inhomogeneous dark fluid     

I. Brevik  A. V. Timoshkin  Y. Rabochaya  S. Zerbini 《Astrophysics and Space Science》2013,347(1):203-208

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Quasi-Rip and Pseudo-Rip universes induced by the fluid inhomogeneous equation of state     

I. Brevik  V. V. Obukhov  A. V. Timoshkin 《Astrophysics and Space Science》2013,344(1):275-279

We investigate specific models for a dark energy universe leading to Quasi-Rip and Pseudo-Rip cosmologies. In the Quasi-Rip model the equation of state parameter w is less than ?1 in the first stage, but becomes larger than ?1 in the second stage. In the Pseudo-Rip model the Hubble parameter tends to a constant value in the remote future, although w is always less than ?1. Conditions for the appearance of the Quasi-Rip and the Pseudo-Rip in terms of the parameters in the equation of state are determined. Analogies with the theory of viscous cosmology are discussed.  相似文献   

Biogeochemistry of encrusting sponges of the family Lubomirskiidae in Southern Lake Baikal     

N. N. Kulikova  E. V. Saibatalova  S. M. Boiko  N. A. Semiturkina  O. Yu. Belozerova  A. S. Mekhonoshin  O. A. Timoshkin  A. N. Suturin 《Geochemistry International》2013,51(4):326-337

ICP-MS analyses of encrusting sponges indicate that their predominant chemical elements are, along with Si, by P, Al, Fe, Ca, S, Mg, K, Na, Cu, Mn, Zn, Ti, Ba, and Br. The sponges are most significantly enriched in Al > Cu > Ti > REE > Mn > P relative to their aqueous habitat and in Cu > I > Cd > P > Br > As ≥ S relative to the relatively rudaceous bottom sediments. One of the sources of elements occurring the aqueous habitat and being of vital importance for the activity of the sponges was proved to be the rock substrates.  相似文献   

Bottom bituminous constructions and biota inhabiting them according to investigation of Lake Baikal with the Mir submersible     

O. M. Khlystov  T. I. Zemskaya  T. Ya. Sitnikova  I. V. Mekhanikova  I. A. Kaigorodova  A. G. Gorshkov  O. A. Timoshkin  O. V. Shubenkova  S. M. Chernitsyna  A. V. Lomakina  A. V. Likhoshvai  A. M. Sagalevich  V. I. Moskvin  V. I. Peresypkin  N. A. Belyaev  M. V. Slipenchuk  A. K. Tulokhonov  M. A. Grachev 《Doklady Earth Sciences》2009,429(1):1333-1336

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Geologic and biogeochemical role of crustose aquatic lichens in Lake Baikal     

N. N. Kulikova  A. N. Suturin  E. V. Saibatalova  S. M. Boiko  E. N. Vodneva  O. A. Timoshkin  A. V. Lishtva 《Geochemistry International》2011,49(1):66-75

Based on materials collected in 2003–2007, data on aquatic lichens of the genus Verrucaria from the rocky littoral zone of Lake Baikal are discussed. The maximum density of their occurrence was observed at a depth of 1.5 m; 95–100% of rock fragments recovered from depths of 1.5–2.2 m are encrusted by 24–43% with the thalli of Verrucaria spp. It was found that the lichens contribute actively to the physical and physicochemical weathering of their rock substrate and prefer to reside on the rocks of granitic composition. The chemical composition of aquatic verrucaria is dominated by the same elements that are most abundant in the rocks (Ca > K > Fe > Al > Mg > P > S > Na > Mn > Sr > Ba), and, in most cases, the characteristic element ratios of the rock compositions are preserved in the composition of the thalli of Verrucaria spp. Compared with the elemental composition of the near-bottom water layer, the lichens most extensively concentrate the elements that slowly migrate in water: Gd > Sm > Pr > Nd > Al > La > Dy > Tb > Y > Lu > Ce > Yb > Be > Tm > Co > Nb > Mn > Zn. Compared with the composition of rocks, the mineral composition of the thalli of Verrucaria spp. is enriched by a factor of 100–10 in Hg > As > P > Zn > Li > S > U > Mo > Se > Cd > Ca > Tl > Sr > Pb > Be.  相似文献