The effect of temperature on digestive efficiency in the herbivorous lizard,Dipsosaurus dorsalis

Recently we have investigated the phase equilibria and antiphase domain structures of Fe-Al alloys containing from 18 to 50 at.% Al by transmission electron microscopy and Mössbauer techniques. This study has revealed that none of the published phase diagrams are correct, although the one proposed by Rimlinger agrees most closely with our results to be published separately. In this paper observations by transmission electron microscopy relating to the nucleation of disorder in Fe-24% Al will be described. Figure 1 shows the structure after heating this alloy to 776.6°C and quenching. The white areas are B2 micro-domains corresponding to regions of disorder which form at the annealing temperature and re-order during the quench. By examining specimens heated in a temperature gradient of 2°C/cm it is possible to determine the effect of temperature on the disordering reaction very precisely. It was found that disorder begins at existing antiphase domain boundaries but that at a slightly higher temperature (1°C) it also occurs by homogeneous nucleation within the domains. A small (∼ .01°C) further increase in temperature caused these micro-domains to completely fill the specimen.

Download Full-text

The effect of temperature on high-resolution TEM image contrast

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100139573 ◽

1995 ◽

Vol 53 ◽

pp. 640-641

Author(s):

T. Geipel ◽

W. Mader ◽

P. Pirouz

Keyword(s):

Form Factor ◽

Inelastic Scattering ◽

Accurate Method ◽

Waller Factor ◽

Effect Of Temperature ◽

Specimen Thickness ◽

Influence Of Temperature ◽

Debye Waller Factor ◽

Influence Of Temperature On ◽

Atomic Form Factor

Temperature affects both elastic and inelastic scattering of electrons in a crystal. The Debye-Waller factor, B, describes the influence of temperature on the elastic scattering of electrons, whereas the imaginary part of the (complex) atomic form factor, fc = fr + ifi, describes the influence of temperature on the inelastic scattering of electrons (i.e. absorption). In HRTEM simulations, two possible ways to include absorption are: (i) an approximate method in which absorption is described by a phenomenological constant, μ, i.e. fi; - μfr, with the real part of the atomic form factor, fr, obtained from Hartree-Fock calculations, (ii) a more accurate method in which the absorptive components, fi of the atomic form factor are explicitly calculated. In this contribution, the inclusion of both the Debye-Waller factor and absorption on HRTEM images of a (Oll)-oriented GaAs crystal are presented (using the EMS software.Fig. 1 shows the the amplitudes and phases of the dominant 111 beams as a function of the specimen thickness, t, for the cases when μ = 0 (i.e. no absorption, solid line) and μ = 0.1 (with absorption, dashed line).

Download Full-text

The development of dormancy in bulblets of Lilium speciosum generated in vitro. II. The effect of temperature

Physiologia Plantarum ◽

10.1034/j.1399-3054.1990.800315.x ◽

1990 ◽

Vol 80 (3) ◽

pp. 431-436 ◽

Cited By ~ 1

Author(s):

Isabelle Delvallee ◽

Annie Paffen ◽

Geert-Jan De Klerk

Keyword(s):

Effect Of Temperature ◽

Lilium Speciosum

Download Full-text

TWO STUDIES ON TEMPERATURE AND MOTOR ABILITY: THE EFFECT OF TEMPERATURE ON SERIAL-DISCRIMINATIVE RESPONSES; THE EFFECT OF TIME AND TEMPERATURE ON MOTOR ABILITY.

PsycEXTRA Dataset ◽

10.1037/e402772004-001 ◽

1954 ◽

Author(s):

Frederick H. Rohles

Keyword(s):

Effect Of Temperature ◽

Motor Ability

Download Full-text

Effect of Temperature on ADP-Induced Platelet Aggregation

Thrombosis and Haemostasis ◽

10.1055/s-0038-1647758 ◽

1973 ◽

Vol 29 (01) ◽

pp. 183-189

Author(s):

C. A Praga ◽

E. M Pogliani

Keyword(s):

Platelet Aggregation ◽

Incubation Period ◽

Room Temperature ◽

Important Variable ◽

Practical Significance ◽

Effect Of Temperature ◽

Induce Platelet Aggregation ◽

Cuvette Holder ◽

Exact Temperature

SummaryTemperature represents a very important variable in ADP-induced platelet aggregation.When low doses of ADP ( < 1 (μM) are used to induce platelet aggregation, the length of the incubation period of PRP in the cuvette holder of the aggregometer, thermostatted at 37° C, is very critical. Samples of the same PRP previously kept at room temperature, were incubated for increasing periods of time in the cuvette of the aggregometer before adding ADP, and a significant decrease of aggregation, proportional to the length of incubation, was observed. Stirring of the PRP during the incubation period made these changes more evident.To measure the exact temperature of the PRP during incubation in the aggre- gometer, a thermocouple device was used. While the temperature of the cuvette holder was stable at 37° C, the PRP temperature itself increased exponentially, taking about ten minutes from the beginning of the incubation to reach the value of 37° C. The above results have a practical significance in the reproducibility of the platelet aggregation test in vitro and acquire particular value when the effect of inhibitors of ADP induced platelet aggregation is studied.Experiments carried out with three anti-aggregating agents (acetyl salicyclic acid, dipyridamole and metergoline) have shown that the incubation conditions which influence both the effect of the drugs on platelets and the ADP breakdown in plasma must be strictly controlled.

Download Full-text