Wyniki wyszukiwania

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The effect of anoxia and post-anoxia on mitochondrial activities of barley [Hordeum vulgare L.] plants

100%

Skutnik M., Kupidlowska E., Rychter A. M.

Biological Letters

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2005

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tom 42

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nr 2 Spec.Vol.

2

The effect of hypoxia and anoxia on osmotic concentrations of Corophium volutator [Pallas] from the Gulf of Gdansk

100%

Dobrzycka-Krahel A., Szaniawska A.

Oceanological and Hydrobiological Studies

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2005

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tom 34

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nr 1

3

Anoxia tolerance and ethanol sensitivity of rice and oat coleoptiles

100%

Kato-Noguchi H., Kugimiya T.

Acta Physiologiae Plantarum

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2002

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tom 24

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nr 1

4

Heme synthesis in yeast does not require oxygen as an obligatory electron acceptor

100%

Krawiec Z., Swiecilo A., Bilinski T.

Acta Biochimica Polonica

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2000

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tom 47

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nr 4

In a previous paper (Krawiec, Z., Bilinski, T., Schueller, C. & Ruis, H., 2000, Acta Biochim. Polon. 47, 201-207) we have shown that catalase T holoenzyme is synthesized in the absence of oxygen after treatment of anaerobic yeast cultures with 0.3M. NaCl, or during heat shock. This finding suggests that heme moiety of the enzyme can either be formed de novo in the absence of oxygen, or derives from the preexisting heme pool present in cells used as inoculum. The strain bearing hem1 mutation, resulting in inability to form delta-aminolevulinate (ALA), the first committed precursor of heme, was used in order to form heme-depleted cells used as inocula. The cultures were supplemented with ALA at the end of anaerobic growth prior the stress treatment. The appearance of active catalase T in the stressed cells strongly suggests that heme moiety of catalase T is formed in the absence of oxygen. This finding suggests the necessity to reconsider current opinions concerning mechanisms of heme synthesis and the role of heme as an oxygen sensor.

5

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PO4 release at the sediment surface under anoxic conditions: a contribution to the eutrophication of the Baltic Sea?

80%

Schneider B.

Oceanologia

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2011

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tom 53

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nr (1-TI)

The vertical profiles of phosphate, total CO2 and oxygen/hydrogen sulphide were determined in the deep water of the Gotland Sea during March 2003 to July 2006 with a temporal resolution of 2–3 months. This time span included the shift from anoxic to oxic conditions resulting from a water renewal event, as well as the transition back to anoxic waters during the subsequent two-year stagnation period. The data from depths below 150 m were used to identify and quantify phosphate release and removal processes. The relationship between the total CO2 generated by mineralization (CT1 min) and the PO4 concentrations indicated that the initial decrease in the phosphate concentrations after the inflow of oxygen-rich water was mainly a dilution effect. Only about one third of the PO4 removal was a consequence of the precipitation of insoluble iron-3-hydroxo-phosphates (Fe-P), which occurred slowly at the sediment surface under oxic conditions. From the CT1 min/PO4 ratios it was also concluded that the formation of Fe-P was reversed during the later phase of the stagnation, when the redoxcline approached a depth of 150 m. A phosphate mass balance was performed for four deep water sub-layers in order to quantify the dissolution of Fe-P during the stagnation period and thus to estimate the amount of Fe-P deposited during the last inflow of oxygen-rich water. A value of about 50 mmol-P m−2 was found, which refers to the specific biogeochemical conditions during the change from anoxic to oxic conditions that preceded the stagnation period.

6

Hypoxia induces anoxia tolerance in roots and shoots of lupine seedlings

80%

Garnczarska M., Ratajczak L.

Acta Physiologiae Plantarum

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2003

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tom 25

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nr 1

7

Manipulating freezing tolerance in transgenic plants

80%

McKersie B. D., Murnaghan J., Bowley S. R.

Acta Physiologiae Plantarum

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1997

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tom 19

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nr 4

Winterhardiness is a composite of tolerances to freezing, desiccation, ice-encasement, flooding and diseases. From one point of view, winterhardiness may not be easily manipulated by genetic engineering technology because many different genes are involved in the tolerance of these diverse stresses. However, these various stresses have similarities. They promote formation of activated forms of oxygen, promote membrane lipid and protein degradation, cause similar biophysical changes in membrane structure, and culminate with increased leakage of cytoplasmic solutes and loss of cellular membrane functions. These similarities led to the hypothesis that winter injury might be reduced in crop plants if their tolerance of oxidative stress was increased. Towards that objective we created transgenic alfalfa (Medicago sativa L.) plants that overexpress either Mn-SOD or Fe-SOD cDNA (provided by Dirk Inzé, Universiteit Gent). Petiole explants were transformed using Agrobacterium tumefaciens and plants were regenerated by somatic embryogenesis. The primary transgenic plants were screened using PCR (polymerase chain reaction), Southern hybridization and native PAGE for SOD activity. Greenhouse and laboratory studies showed a minimal difference in stress tolerance between the primary transgenic and non-transgenic plants. In the first field trial, four primary transgenic plants expressing two forms of the Mn-SOD cDNA had greater survival after two winters than the non-transgenic RA3. Similar results were obtained in a second field trial, comparing 18 independent transformants with Mn-SOD targeted to the mitochondria, 11 independent transformants with Mn-SOD targeted to the chloroplast and 39 independent transformants with Fe-SOD targeted to the chloroplast, expressed in three different non-transgenic plants. The transgenic plants averaged over 25% higher survival than the non-transgenic controls after one winter. There was no effect of subcellular targeting or SOD type on field survival, but there was variation among independent transformants containing the same SOD construct. Activated oxygen therefore appears to be one of the possible causes of winter injury, and it should be possible to reduce winter injury in transgenic plants by constitutive overexpression of SOD.

8

Effects of anoxia on the behaviour, haemolymph lactate and glycogen concentrations in the mud crab Rhithropanopeus harrisii ssp. tridentatus [Maitland] [Crustacea: Decapoda]

80%

Rychter A.

Oceanologia

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1997

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tom 39

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nr 3

9

Toksyczna smierc komorki

71%

Siegel A., Kaminski M.

Acta Poloniae Toxicologica

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1994

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tom 02

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nr 2

95-103

10

Wpływ hipoksji na fluktuacje w zawartości jabłczanu, cytrynianu oraz nateżenie wymiany gazowej w gametoforach mchów

61%

Rut G., Rzepka A., Krupa J.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2010

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tom 545

Mchy są roślinami o prostej budowie anatomicznej i występując w siedliskach charakteryzujących się dużą zmiennością czynników zewnętrznych, często narażone są na stres wywołany brakiem lub nadmiarem wody. Zalanie wodą powoduje zmianę w dostępności poszczególnych form rozpuszczalnego nieorganicznego węgla (DIC; dissolved inorganic carbon). W wyniku zalania wodą zmienia się charakter reakcji związanych z przemianami jabłczanu, cytrynianu oraz natężeniem wymiany gazowej w gametoforach mchów. Jabłczan oraz cytrynian odgrywają istotną rolę w wielu ważnych metabolicznych procesach przyczyniających się do prawidłowego przebiegu fotosyntezy, glikolizy, cyklu TCA i asymilacji azotu. Dobowe różnice w zawartości jabłczanu w gametoforach Polytrichum piliferum Hedw. były nieznaczne. Natomiast w gametoforach Mnium undulatum Hedw. stwierdzono istotne różnice w akumulacji jabłczanu między nocą a dniem. Warunki hipoksji (zalanie wodą) wywoływały wzrost dobowych oscylacji w stężeniu jabłczanu szczególnie w gametoforach P. piliferum. Fluktuacje w stężeniu cytrynianu powstającego w warunkach hipoksji wzrastają w gametoforach M. undulatum, natomiast oscylacje stężenia tego związku w P. piliferum są zbliżone do wartości kontrolnych. Czynniki stresowe powodują obniżenie intensywności fotosyntezy przy jednoczesnym wzroście natężenia oddychania. Zwiększone dobowe fluktuacje jabłczanu, w badanych gatunkach w warunkach hipoksji stanowić mogą ważny element strategii przystosowawczej do tych warunków.

11

Indukcja systemu obronnego u pszenicy i pszenzyta w warunkach stresu tlenowego

61%

Bennicelli R. P.

Acta Agrophysica

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2002

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tom 75

1-80

12

Hepcydyna - hormon metabolizmu zelaza u czlowieka i zwierzat. Czesc II. Rola hepcydyny w chorobach

51%

Kosla T., Cieslik L., Skibniewski M., Wrzesien R., Skibniewska E. M., Michalik P.

Roczniki Państwowego Zakładu Higieny

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2004

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tom 55

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nr Supl.

7-12

Opisano rolą hepcydyny jako mediatora wrodzonej odporności przy infekcjach bakteryjnych, stanie zapalnym, niedokrwistości i niedotlenieniu oraz przy wrodzonej hemochromatozie.

13

Przyczyny strat prosiąt z uwzględnieniem okresu prenatalnego do odsadzenia od lochy

41%

Pejsak Z., Truszczynski M.

Lecznica Dużych Zwierząt. Ogólnopolski Kwartalnik dla Lekarzy Weterynarii

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2014

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tom 09

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nr 2

Ograniczanie wyników

The effect of anoxia and post-anoxia on mitochondrial activities of barley [Hordeum vulgare L.] plants

The effect of hypoxia and anoxia on osmotic concentrations of Corophium volutator [Pallas] from the Gulf of Gdansk

Anoxia tolerance and ethanol sensitivity of rice and oat coleoptiles

Heme synthesis in yeast does not require oxygen as an obligatory electron acceptor

PO4 release at the sediment surface under anoxic conditions: a contribution to the eutrophication of the Baltic Sea?

Hypoxia induces anoxia tolerance in roots and shoots of lupine seedlings

Manipulating freezing tolerance in transgenic plants

Effects of anoxia on the behaviour, haemolymph lactate and glycogen concentrations in the mud crab Rhithropanopeus harrisii ssp. tridentatus [Maitland] [Crustacea: Decapoda]

Toksyczna smierc komorki

Wpływ hipoksji na fluktuacje w zawartości jabłczanu, cytrynianu oraz nateżenie wymiany gazowej w gametoforach mchów

Indukcja systemu obronnego u pszenicy i pszenzyta w warunkach stresu tlenowego

Hepcydyna - hormon metabolizmu zelaza u czlowieka i zwierzat. Czesc II. Rola hepcydyny w chorobach

Przyczyny strat prosiąt z uwzględnieniem okresu prenatalnego do odsadzenia od lochy