Effect of temperature and hydrostatic pressure on algal respiration

1974 ◽  
Vol 52 (11) ◽  
pp. 2375-2379 ◽  
Author(s):  
Daniel H. Pope ◽  
Leslie R. Berger
Keyword(s):  
Hydrostatic Pressure ◽  
Dark Respiration ◽  
Anacystis Nidulans ◽  
Dunaliella Tertiolecta ◽  
Effect Of Temperature ◽  
Metabolic Processes ◽  
Differential Effects ◽  
Linear Fashion ◽  
Effects Of Temperature ◽  
Temperature And Pressure

Rates of dark respiration in Anacystis nidulans and Dunaliella tertiolecta, determined as loss of previously fixed 14CO2, were measured as a function of temperature and hydrostatic pressure. The rates of respiration in both algae decreased with decreased temperature over the range 25 to 5 °C in an approximately linear fashion and at 5 °C were only 10 to 20% of the rate at 25 °C. The rate of respiration by A. nidulans decreased with increased hydrostatic pressure. At 600 atm the rate was about 50% of that at 1 atm. Respiration by D. tertiolecta seemed to be unaffected by pressures to 600 atm. These results suggest that algal cells observed to occur in the deep oceans are potentially metabolically active at those depths; that they cannot survive for long periods of time solely through the utilization of previously stored materials; and that a heterotrophic mode of metabolism is most likely to explain their occurrence. The differential effects of temperature and pressure on various metabolic processes and growth of microalgae are also discussed.

scholarly journals Effects of temperature and pressure on the thermal conductivities of solids. Part I. The effect of temperature on the thermal conductivities of some electrical insulators

1905 ◽  
Vol 204 (372-386) ◽  
pp. 433-466 ◽  
Keyword(s):  
Thermal Conductivity ◽  
Experimental Work ◽  
Effect Of Temperature ◽  
Opposite Conclusion ◽  
Effects Of Temperature ◽  
Temperature And Pressure ◽  
Thermal Conductivities

The question as to whether the thermal conductivity of a solid varies with temperature is an important one, and a considerable amount of attention has been bestowed on it. The experimental work which has been done cannot, however, be said to have led to a definite conclusion, owing to the discrepancies between the results obtained by different observers. Although the more recent of these results have produced a general disbelief of the idea which prevailed a few years ago, that the thermal conductivity of a solid would increase as the temperature increased, yet they do not justify the opposite conclusion being drawn.

scholarly journals Effect of Temperature and Pressure of Supercritical CO2 on Dewatering, Shrinkage and Stresses of Eucalyptus Wood

2021 ◽  
Vol 11 (18) ◽  
pp. 8730
Author(s):  
Lin Yang
Keyword(s):  
Residual Stress ◽  
Supercritical Co2 ◽  
Tangential Direction ◽  
Effect Of Temperature ◽  
Eucalyptus Wood ◽  
Conventional Kiln Drying ◽  
Effects Of Temperature ◽  
Temperature And Pressure ◽  
Capillary Tension ◽  
Increasing Temperature

Supercritical CO2 (SuCO2) dewatering can mitigate capillary tension and reduce wood collapse. In this study, Eucalyptus urophylla × E. grandis specimens were dewatered by SuCO2 at temperatures of 35, 40 and 55 °C, in pressures of 10 and 30 MPa, respectively, for 1h. Effects of temperature and pressure on dewatering rate, moisture content (MC) distribution and gradient, shrinkage and residual stress of wood after dewatering were investigated. The results indicate that the SuCO2 dewatering rate is much faster than that of conventional kiln drying (CKD). The dewatering rate increases with increasing of temperature and pressure; however, pressure has a significant influence, especially for the high-temperature dewatering process; the MC distribution after 1 h dewatering is uneven and MC gradients decrease with reducing of mean final MC of wood. MC gradients along radial direction are much smaller than that in tangential direction; collapse of wood significantly reduces after dewatering due to SuCO2 decreasing the capillary tension, and residual stress of wood during dewatering is mainly caused by pressure of SuCO2, which decreases with increasing temperature. SuCO2 dewatering has great potential advantages in water-removal of wood prone to collapse or deformation.

scholarly journals The effects of temperature and pressure on the thermal conductivities of bodies. Part I.–The effect of temperature on the thermal conductivities of some electrical insulators.

1905 ◽  
Vol 74 (497-506) ◽  
pp. 337-338 ◽  
Author(s):  
Charles Herbert Lees ◽  
Arthur Schuster
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistance ◽  
Electrical Current ◽  
Effect Of Temperature ◽  
Thin Cylinder ◽  
Heating Wire ◽  
Effects Of Temperature ◽  
Temperature And Pressure ◽  
At Will ◽  
Thermal Conductivities

The substance whose thermal conductivity is to be determined has the form of a cylinder about 8 cms. long, 2 cms. diameter, and is surrounded by a thin cylinder of brass, which on account of its comparatively high thermal conductivity, makes the outer surfaces of the substance isothermal surfaces. The brass cylinder is placed in a Dewar The heat is supplied by the passage of an electrical current through platinoid wire embedded in the substance parallel to the axis of the cylinder, and about .4 cm. distant from it. The amount of heat generated is determined by the current through the wire and the potential difference between its ends. The temperature is measured by the electrical resistance of two short spirals of No. 40 pure platinum wire, down the centre of one of which the heating wire passes. To eliminate errors due to want of symmetry, a second heating wire passes down the centre of the second spiral, and the heating current may be sent through either or both at will.

Effect of temperature during the synthesis process of CdSe nanoparticles using the colloidal technique

MRS Advances ◽  
2020 ◽  
Vol 5 (63) ◽  
pp. 3389-3395
Author(s):  
R. González-Díaz ◽  
D. Fernández-Sánchez ◽  
P. Rosendo-Francisco ◽  
G. Sánchez-Legorreta
Keyword(s):  
Scanning Tunneling Microscope ◽  
Electron Cloud ◽  
Cdse Nanoparticles ◽  
Effect Of Temperature ◽  
Synthesis Process ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
First Results ◽  
Effects Of Temperature ◽  
Scanning Electron

AbstractIn this work, the first results of the effects of temperature during the production of Se2- ions and the effect during the interaction of Cd2+ and Se2- ions in the synthesis process of CdSe nanoparticles are presented. The synthesis of CdSe was carried out by the colloidal technique, in the first one we used a temperature of 63 °C to produce Se2- ions and in the second one an interaction temperature of 49 °C. The samples were characterized using a Scanning Electron Microscope (SEM) and a Scanning Tunneling Microscope (STM). From the SEM micrographs it was possible to identify the thorns formation and irregular islands. STM micrographs reveal elliptical shapes with a regular electron cloud profile.

Palladium-catalyzed carbonylation of 1,5-cyclooctadiene. Effects of temperature and pressure

1991 ◽  
Vol 56 (3) ◽  
pp. 663-672 ◽  
Author(s):  
Curtis B. Anderson ◽  
Rade Marković
Keyword(s):  
Carbon Monoxide ◽  
Oxidative Carbonylation ◽  
Influence Of Temperature ◽  
Carbonylation Reaction ◽  
Palladium Catalyzed ◽  
Effects Of Temperature ◽  
Temperature And Pressure

The influence of temperature and carbon monoxide pressure on the course of oxidative carbonylation reaction of 1,5-cyclooctadiene in the presence of the palladium(II) salts as a catalyst, was investigated.

Effect of temperature and pressure on mixed oxide solid solutions

2020 ◽  
Vol 117 ◽  
pp. 107965
Author(s):  
M.Yu. Petrushina ◽  
E.S. Dedova ◽  
K.V. Yusenko ◽  
A.S. Portnyagin ◽  
E.K. Papynov ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Mixed Oxide ◽  
Effect Of Temperature ◽  
Temperature And Pressure

SOLUBILITY OF ETHYLENE IN WATER. EFFECT OF TEMPERATURE AND PRESSURE

1952 ◽  
Vol 44 (1) ◽  
pp. 211-212 ◽  
Author(s):  
E. J. Bradbury ◽  
Dorothy McNulty ◽  
R. I. Savage ◽  
E. E. McSweeney
Keyword(s):  
Effect Of Temperature ◽  
Water Effect ◽  
Temperature And Pressure
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