scholarly journals Short-term temperature effects on oxygen and sulfide cycling in a hypersaline cyanobacterial mat (Solar Lake, Egypt)

2000 ◽  
Vol 196 ◽  
pp. 87-102 ◽  
Author(s):  
A Wieland ◽  
M Kühl
Keyword(s):  
Temperature Effects ◽  
Cyanobacterial Mat ◽  
Short Term ◽  
Solar Lake

Short-term temperature effects on the anaerobic metabolism of glycogen accumulating organisms

2007 ◽  
Vol 97 (3) ◽  
pp. 483-495 ◽  
Author(s):  
Carlos M. Lopez-Vazquez ◽  
Young-Il Song ◽  
Christine M. Hooijmans ◽  
Damir Brdjanovic ◽  
Moustafa S. Moussa ◽  
...  
Keyword(s):  
Temperature Effects ◽  
Anaerobic Metabolism ◽  
Short Term

scholarly journals Spirochaeta sinaica sp. nov., a halophilic spirochaete isolated from a cyanobacterial mat

2015 ◽  
Vol 65 (Pt_11) ◽  
pp. 3872-3877 ◽  
Author(s):  
Galina Dubinina ◽  
Margarita Grabovich ◽  
Nataliya Leshcheva ◽  
Sabine Gronow ◽  
Ekaterina Gavrish ◽  
...  
Keyword(s):  
Gene Sequence ◽  
Novel Species ◽  
Rrna Gene ◽  
Cyanobacterial Mat ◽  
Glucose Fermentation ◽  
Free Living ◽  
Nitrogenous Compounds ◽  
Gene Sequence Analysis ◽  
Solar Lake

A strain of free-living obligately anaerobic, halophilic spirochaete, SLT, was isolated from a sample of a cyanobacterial mat of the hypersaline Solar Lake, Sinai shore. The strain had motile helical cells, 0.35–0.40 × 6–10 μm. Strain SLT exhibited high resistance to NaCl among known halophilic spirochaetes growing at NaCl concentrations from 2 to 12 % (optimum growth at 7 %). The strain grew at temperatures from 10 to 32 °C (optimum at 28 °C) and pH from 6 to 8.5 (optimum at pH 7.0–7.5). Carbohydrates, but not alcohols, organic acids or nitrogenous compounds (peptone, yeast extract and amino acids), were used as energy substrates for growth. Ethanol, acetate, lactate, H2 and CO2 were the products of glucose fermentation. Sulfide was produced in the presence of S0 or thiosulfate in the medium. The DNA G+C content was 44.7 mol%. Based on 16S rRNA gene sequence analysis, strain SLT clustered within the genus Spirochaeta, exhibiting 94.2 and 93.7 % similarity with its closest relatives, Spirochaeta bajacaliforniensis DSM 160554T and Spirochaeta smaragdinae DSM 11293T, respectively; similarity with other species did not exceed 86 %. The phenotypic and chemotaxonomic characteristics of the strain, as well as the results of phylogenetic analysis support the classification of strain SLT as representing a novel species of the genus Spirochaeta, for which the name Spirochaeta sinaica sp. nov. is proposed. The type strain is SLT ( = DSM 14994 = UNIQEM U 783).

Effects of short-term low temperature stress on chlorophyll fluorescence transients in Antarctic lichen species

2016 ◽  
Vol 6 (1) ◽  
pp. 54-65 ◽  
Author(s):  
Michaela Marečková ◽  
Miloš Barták
Keyword(s):  
Chlorophyll Fluorescence ◽  
Low Temperature ◽  
Temperature Effects ◽  
Photochemical Quenching ◽  
Short Term ◽  
Ps Ii ◽  
Species Specific ◽  
Non Photochemical Quenching ◽  
Fluorescence Transients ◽  
Chlorophyll Fluorescence Transients

Chlorophyll fluorescence is an effective tool for investigating characteristics of any photosynthesizing organisms and its responses due to different stressors. Here, we have studied a short-term temperature response on two Antarctic green algal lichen species: Umbilicaria antarctica, and Physconia muscigena. We measured slow chlorophyll fluorescence transients in the species during slow a cooling of thallus temperature from 20°C to 5°C with a 10 min. acclimation at each temperature in dark. The measurements were supplemented with saturation pulses for the analysis of chlorophyll fluorescence parameters: maximum yield of PS II photochemistry (FV/FM), effective quantum yield of PS II photochemistry (FPSII) and non-photochemical quenching (NPQ). In response to decreasing thallus temperature, we observed species-specific changes in chlorophyll fluorescence levels P, S, M, T reached during chlorophyll fluorescence transient as well as in the shape of the chlorophyll fluorescence transients. With a decrease in temperature, the time at which M and T chlorophyll fluorescence levels were reached, increased. These changes were attributed to redox state of plastoquinon pool, changes in Calvin-Benson cycle activity, non-photochemical quenching components, state transition in particular. In this study, we present some chlorophyll fluorescence ratios (P/M, M/T, P/T) and chlorophyll fluorescence increase rates (FR1, i.e. O to P, and FR2 - i.e. S to M) as the parameters reflecting direct temperature effects on chloroplastic apparatus of lichen alga sensitively. We proposed that species-specific changes in the slow phase of chlorophyll fluorescence transients could be potentially used as indicators of low temperature effects in photosynthetic apparatus of lichen algal photobionts. Interspecific differences in response to low temperature might be evaluated using the approach as well.

scholarly journals Short-Term City Electric Load Forecasting with Considering Temperature Effects: An Improved ARIMAX Model

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Herui Cui ◽  
Xu Peng
Keyword(s):  
Temperature Effects ◽  
Load Forecasting ◽  
Sigmoid Function ◽  
Electric Load ◽  
Short Term ◽  
External Temperature ◽  
Ann Models ◽  
Electricity Load ◽  
Mutation Data ◽  
Improved Model

Short-term electric load is significantly affected by weather, especially the temperature effects in summer. External factors can result in mutation structures in load data. Under the influence of the external temperature factors, city electric load cannot be easily forecasted as usual. This research analyzes the relationship between electricity load and daily temperature in city. An improved ARIMAX model is proposed in this paper to deal with the mutation data structures. It is found that information amount of the improved ARIMAX model is smaller than that of the classic method and its relative error is less than AR, ARMA and Sigmoid-Function ANN models. The forecasting results are more accurately fitted. This improved model is highly valuable when dealing with mutation data structure in the field of load forecasting. And it is also an effective technique in forecasting electric load with temperature effects.

The challenge of predicting temperature effects on short-term predator–prey dynamics

2014 ◽  
Vol 56 (2) ◽  
pp. 375-392 ◽  
Author(s):  
Karen C. Abbott ◽  
Jason P. Harmon ◽  
Nicholas S. Fabina
Keyword(s):  
Temperature Effects ◽  
Short Term ◽  
Predator Prey

Contrasting short-term temperature effects on the profiling of metabolic and stress hormones in non-obese healthy adults: A randomized cross-over trial

2020 ◽  
Vol 182 ◽  
pp. 109065
Author(s):  
Konstantinos C. Makris ◽  
Corina Konstantinou ◽  
Anastasia Perikkou ◽  
Ana B. Zdravic ◽  
Costas A. Christophi
Keyword(s):  
Temperature Effects ◽  
Stress Hormones ◽  
Healthy Adults ◽  
Short Term
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