Wyniki wyszukiwania

1

Assimilation of aboveground litter carbon versus soil carbon by Collembola and Lumbricidae in spruce forest: a litter replacement experiment

100%

Semenina E. E., Tiunov A. V.

Polish Journal of Ecology

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2020

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tom 68

|

nr 2

2

Benthic and planktic foraminifera as indicators of Late Glacial to Holocene paleoclimatic changes in a marginal environment: An example from the Southeastern Bay of Biscay

84%

Garcia J., Mojtahid M., Howa H., Michel E., Schiebel R., Charbonnier C., Anschutz P., Jorissen F. J.

Acta Protozoologica

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2013

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tom 52

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nr 3

3

Incorporation of nitrogen isotope 15N into liver DNA during avian embryogenesis. A new approach for measuring the rate of DNA synthesis

84%

Chwalibog A., Metges C. C., Sawosz Chwalibog E., Grodzik M., Niemiec T.

Journal of Animal and Feed Sciences

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2010

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tom 19

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nr 2

269-276

The objective of this experiment was to test the possibilities of measuring the rate of DNA synthesis in chicken embryos by applying a simple 15N tracer technique. We hypothesized that the rate of 15N incorporation into liver DNA depends on the type of labelled substance, reflecting precursor availability to provide substrates for nucleotide synthesis. Fertilized eggs were divided into 4 groups (4 × 15): control – not treated, and treated with 15N labeled glycine, ammonium chloride, or sodium nitrate. 15N labeled solutions were given in ovo by injection into albumen. After 20 days of incubation, the labeled substances had no effect on embryo development or morphology. Hepatic DNA was purified and 15N abundance was measured by isotope ratio mass spectrometry. There was significant enrichment of 15N in DNA from the glycine and ammonium chloride groups. We conclude that this simple technique of injecting 15N tracers into incubating eggs can be used to estimate the rate of DNA synthesis.

4

Leaves as “crackers”, biofilm as “peanut butter”: Exploratory use of stable isotopes as evidence for microbial pathways in detrital food webs

84%

France R. L.

Oceanological and Hydrobiological Studies

|

2011

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tom 40

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nr 4

5

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Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector)

84%

Khare N., Chaturvedi S. K.

Oceanologia

|

2012

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tom 54

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nr 2

Twenty-five surficial sediment samples, collected on board ORV Sagar Kanya during her 199th and 200th cruises along a north-south transect between latitudes 9.69◦N and 55.01◦S, and longitudes 80◦E and 40◦ E were studied for isotopic variations (values of δ18O and δ13C) of the indicator planktonic species Globigerina bulloides. The results indicate that from latitudes 9.69◦N to 15◦ S both these isotopes (δ18O and δ13C) fluctuated significantly. Between latitudes from around 15◦S to 30–35◦S δ18O values steadily increased, whereas δ13C showed a decreasing trend. However, to the south of latitudes 30–35◦S, both isotope values showed a similar response with a gradual increase up to latitude 50◦S, beyond which δ18O continued to increase while δ13C declined. The characteristic patterns of the values of both isotopes indicates that the signatures of different water masses are associated with various frontal systems and/or water masses across the transect. The signature of the Polar Front at around latitude 50◦S shows the specific response of the isotopic values (δ18O and δ13C) of G. bulloides. Such a response beyond 50◦S latitude is ascribable to the general decrease in the ambient temperature, resulting in a continuous increase in δ18O values, while δ13C values decrease as a result of reduced photosynthesis in regions approaching higher latitudes owing to low light penetration. To further corroborate our results, those of many such transects from geographically distinct regions need to be studied for isotopic variations in the calcareous shells of planktonic foraminiferal species. The results have the potential to be used as a proxy to assess the movement of frontal systems in southern high latitude regions.

6

Trophic connectivity between intertidal and offshore food webs in Mirs Bay, China

84%

Ning J., Du F., Wang X., Wang L., Li Y.

Oceanologia

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2019

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tom 61

|

nr 2

7

Sulfur cycling and the sulfurization of humic and fulvic acids in the sediments of the rivers Rupel [Belgium] and Authie [Northern France]

84%

Lojen S., Cermelj B., Wartel M.

Oceanological and Hydrobiological Studies

|

2007

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tom 36

|

nr 1

8

Denitrification in the sediment of a eutrophic reservoir measured with the isotope pairing technique

67%

Gruca-Rokosz R., Tomaszek J. A., Koszelnik P.

Oceanological and Hydrobiological Studies

|

2009

|

tom 38

|

nr 1

75-81

9

The paleoecology of the Late Miocene mammals from the Optima Local Fauna of Oklahoma, USA

67%

Frederickson J. A., Cohen J. E., Engel M. H., Hunt T. C., Wilbert G. A., Castaneda O. S., Czaplewski N. J.

Acta Palaeontologica Polonica

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2022

|

tom 67

|

nr 1

10

The use of stable isotope analyses in freshwater ecology: current awareness

67%

Grey J.

Polish Journal of Ecology

|

2006

|

tom 54

|

nr 4

Ecological research using stable isotopes has progressed rapidly during the last 20 years and although more studies are including the addition of isotopically labelled compounds at tracer levels, the overwhelming majority rely on measurements of natural abundance ratios. Access to isotope ratio mass spectrometry has increased, spurred on by awareness of the techniques and increasing demand, and consequently cost of sample analysis has dropped. Today stable isotopes of carbon (¹³C/¹²C), nitrogen (¹⁵N/¹⁴N), sulphur (³⁴S/³²S), oxygen (¹⁸O/¹⁶O), and hydrogen (²H/¹H) can be determined routinely. Perhaps one of the most appealing attributes of isotopic signatures is their potential use to find patterns and determine mechanisms across a range of scales from the molecular level through to characterising whole food webs, reconstructing palaeoenvironments, tracing nutrient fluxes between ecosystems and identifying subsidies, or migrations of organisms. Ecologists from every discipline who are unlikely to have been trained as isotope chemists have added stable isotope analysis (SIA) to their “toolbox”, but often increasing use leads to increasing abuse. The usefulness of SIA arises from predictable physical and enzymatic-based discrimination between biological and non-biological materials leading to different isotopic compositions. Without some ecological understanding of these, interpretation of isotope-derived data can often be flawed. Here, I explore how SIA recently has been used for research in aquatic ecology, reviewing how some of these techniques have allowed elucidation of key processes in aquatic systems such as the contribution of allochthony to lake food webs, and discuss the “state of the art”. Included are some thoughts on where our knowledge in aquatic ecology remains deficient and how continued development and future application of SIA and interdisciplinary methodologies may be applied.

11

Summer phytoplankton and the hydrochemistry of the crater lake Laguna Azul [Santa Cruz, Argentina]

67%

Messyasz B., Maidana N., Mayr C., Lucke A.

Oceanological and Hydrobiological Studies

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2007

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tom 36

|

nr Suppl.1

12

13C-urea breath test for detection of Helicobacter pylori and its correlation with endoscopic and histologic findings

67%

Hilker E., Domschke W., Stoll R.

Journal of Physiology and Pharmacology

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1996

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tom 47

|

nr 1

13

Evolution of isotopic composition and concentration of atmospheric CO2 as result of anthropogenic influences

67%

Kuc T., Zimnoch M.

Geographia Polonica

|

1994

|

tom 62

14

Trophic structure of Ozark cave streams containing endangered species

67%

Graening G. O.

Oceanological and Hydrobiological Studies

|

2005

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tom 34

|

nr 3

Ograniczanie wyników

Assimilation of aboveground litter carbon versus soil carbon by Collembola and Lumbricidae in spruce forest: a litter replacement experiment

Benthic and planktic foraminifera as indicators of Late Glacial to Holocene paleoclimatic changes in a marginal environment: An example from the Southeastern Bay of Biscay

Incorporation of nitrogen isotope 15N into liver DNA during avian embryogenesis. A new approach for measuring the rate of DNA synthesis

Leaves as “crackers”, biofilm as “peanut butter”: Exploratory use of stable isotopes as evidence for microbial pathways in detrital food webs

Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector)

Trophic connectivity between intertidal and offshore food webs in Mirs Bay, China

Sulfur cycling and the sulfurization of humic and fulvic acids in the sediments of the rivers Rupel [Belgium] and Authie [Northern France]

Denitrification in the sediment of a eutrophic reservoir measured with the isotope pairing technique

The paleoecology of the Late Miocene mammals from the Optima Local Fauna of Oklahoma, USA

The use of stable isotope analyses in freshwater ecology: current awareness

Summer phytoplankton and the hydrochemistry of the crater lake Laguna Azul [Santa Cruz, Argentina]

13C-urea breath test for detection of Helicobacter pylori and its correlation with endoscopic and histologic findings

Evolution of isotopic composition and concentration of atmospheric CO2 as result of anthropogenic influences

Trophic structure of Ozark cave streams containing endangered species