Changes in sterol and phospholipid composition of apples during storage at low temperature and low oxygen concentration

1986 ◽  
Vol 37 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Ian M. Bartley
Keyword(s):  
Low Temperature ◽  
Oxygen Concentration ◽  
Phospholipid Composition ◽  
Low Oxygen ◽  
Low Oxygen Concentration

Anaerobic Survival of the Crustaceans Corophium Volutator, C. Arenarium and Tanais Chevreuxi

1970 ◽  
Vol 50 (3) ◽  
pp. 657-671 ◽  
Author(s):  
J. C. Gamble
Keyword(s):  
Low Temperature ◽  
Oxygen Concentration ◽  
Anaerobic Respiration ◽  
Similar Relationship ◽  
Freshwater Lakes ◽  
Low Oxygen ◽  
Corophium Volutator ◽  
Chironomid Larvae ◽  
Multicellular Organisms ◽  
Low Oxygen Concentration

The overriding metabolic advantages of aerobic as compared with anaerobic respiration have resulted in its use by the majority of multicellular organisms. However, in some habitats oxygen is limiting to such an extent that anaerobic respiration becomes a necessity for survival. It has frequently been demonstrated that the extent of anaerobiosis depends, obviously, on the degree of oxygenation of the environment (see reviews by von Brand, 1944, 1945; Beadle, 1961). Hence, not only are there entirely anaerobic organisms but many other organisms exist which, in times of anoxic stress, are able to undergo a partial, or facultative, anaerobiosis. Lindeman (1942) discovered that, at low temperature, aquatic chironomid larvae could survive the entire winter anaerobically in the anoxic hypolimnion of freshwater lakes. Similarly, but to a lesser extent, pond-living crayfish of the genus Cambarus are more resistant to low oxygen concentration than stream-living individuals (Park, 1945). Walshe (1948) has also been able to establish a similar relationship in a group of stream and ditch dwelling chironomid larvae.

Effect of low oxygen concentration on activation of inflammation by Helicobacter pylori

2021 ◽  
Vol 560 ◽  
pp. 179-185
Author(s):  
Adiza Abass ◽  
Tokuju Okano ◽  
Kotchakorn Boonyaleka ◽  
Ryo Kinoshita-Daitoku ◽  
Shoji Yamaoka ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Oxygen Concentration ◽  
Low Oxygen ◽  
Low Oxygen Concentration

The Constant Low Oxygen Concentration in All the Target Cells for Mouse Tail Radionecrosis

1982 ◽  
Vol 92 (1) ◽  
pp. 172 ◽  
Author(s):  
J. H. Hendry ◽  
J. V. Moore ◽  
B. W. Hodgson ◽  
J. P. Keene
Keyword(s):  
Oxygen Concentration ◽  
Target Cells ◽  
Low Oxygen ◽  
Low Oxygen Concentration

scholarly journals Zooplankton fluctuations in Jurumirim Reservoir (São Paulo, Brazil): a three-year study

2009 ◽  
Vol 69 (1) ◽  
pp. 1-18 ◽  
Author(s):  
LP. Sartori ◽  
MG. Nogueira ◽  
R. Henry ◽  
EM. Moretto
Keyword(s):  
Water Column ◽  
Oxygen Concentration ◽  
Retention Time ◽  
Sao Paulo ◽  
Seasonal Effect ◽  
São Paulo ◽  
Low Oxygen ◽  
High Concentration ◽  
Heterogeneous Distribution ◽  
Low Oxygen Concentration

During three consecutive years, monthly samples of zooplankton were taken in the lacustrine (dam) zone of Jurumirim (São Paulo, Brazil). The seasonal effect on basic limnological features (thermal regime, oxygen distribution, phytoplankton biomass, etc.) was also examined. The influence of the seasonality on the fluctuation of the zooplankton composition and abundance was not clearly detected (low degree of recurrent patterns). Rotifers (32 taxa) were the most abundant organisms during almost the entire study period with some seasonal alternations in the maximum abundance peaks of the main taxa (Conochilus unicornis, Keratella americana, K. cochlearis and Hexarthra spp.), except for Polyarthra (mainly P. vulgaris). Only occasionally copepods were numerically dominant. Higher copepod abundance was positively associated to periods of increase in the water retention time. Among the Copepoda (10 taxa) the calanoids (mainly Notodiaptomus iheringi) were more abundant, especially in warmer periods. Conversely, cyclopoids had higher abundance in autumn and winter. The species Thermocyclops minutus and T. decipiens co-occurred, but the first attained higher abundance. Some evidence of co-existence strategies between both species are considered. Cladocera (17 taxa) was never numerically dominant and the main taxa (Bosmina spp., Ceriodaphnia spp. and Diaphanosoma spp.) occurred almost the whole study period and did not present a seasonal pattern of fluctuation. Diaphanosoma (mainly D. birgei) attained the highest abundance among cladocerans. Most organisms were always found at the surface, but they also occupy the whole water column, even in periods of stratified conditions and low oxygen concentration in the bottom layers. Among the main zooplanktonic taxa, only Hexarthra avoids deep layers. An exceptionally high concentration of Copepoda nauplii on the surface was influenced by low transparency, high concentration of phytoplankton at this layer and low oxygen concentration at the bottom. In periods of higher retention timevariability there was a more heterogeneous distribution of the zooplankton in the water column. The increase in the retention time seems also to favor the copepod development. Finally, some inter-decade changes are considered on the basis of zooplankton assemblage structure observations.

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