Influence of Temperature on Rate of Regeneration in the Time-graded Regeneration Field in Planarians

Development ◽  
1961 ◽  
Vol 9 (1) ◽  
pp. 159-166
Author(s):  
Agnes Brøndsted ◽  
H. V. Brøndsted
Keyword(s):  
The Body ◽  
Influence Of Temperature ◽  
High Point ◽  
Know How ◽  
Influence Of Temperature On ◽  
Temperature Levels ◽  
Species Specific ◽  
Head Regeneration

There exists in planarians a time-graded regeneration field for head regeneration (Brøndsted, 1946, 1956; A. & H. V. Brøndsted, 1952). The characteristics of this field, expressed by rate of regeneration, are species-specific. The existence of this field ensures harmonious regeneration from cuts everywhere in the body, as a cut will always expose a ‘high point’ where regeneration of a head starts with greatest speed, thus taking the lead in organization and at the same time inhibiting head-forming tendencies elsewhere in the blastema (Brøndsted, 1956). The factors underlying these characteristics of the field are unknown; the problems involved are being attacked from several angles in our laboratory. For the sake of this work it is of some interest to know how the different rates of regeneration at various levels in the time-graded fields might be influenced by various temperature levels. Material and Methods The experiments were carried out on two species differing greatly in the characteristics of their time-graded regeneration fields.

scholarly journals Impact of Heat on the Different Stages of the Production of Local Beer “Tchoukoutou” Made from Sorghum

2021 ◽  
Vol 37 (6) ◽  
pp. 1359-1365
Author(s):  
Adjo Cynthia Kouakou ◽  
Agbékonyi Kokou Agbodan ◽  
Kwami Lumo Awaga ◽  
Awèdéou Bakpo ◽  
Eyawèdeou Yelegue ◽  
...  
Keyword(s):  
Germination Rate ◽  
Effect Of Temperature ◽  
Soaking Time ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Temperature Ranges ◽  
The Subject ◽  
Temperature Levels ◽  
C 30

Tchoukoutou is a local alcoholic drink made from sorghum. The optimization and good quality of this drink depend on certain factors such as temperature that were the subject of our work. To carry out this study, we have set ourselves the general objective of structuring the production of Tchoukoutou. Specifically, the study aims to systematize the cooking of the wort, to verify the properties of the beer through tests and to produce a quality drink. An investigation was made on the influence of temperature on sorghum germination and wort cooking. The study of the effect of temperature on the germination of sorghum was carried out. It concerned four different temperature levels which are: 23 ° C, 26 ° C, 30 ° C and 35 ° C. A study of the influence of temperature on brewing was done with different varieties of sorghum and also at different temperature ranges: 78 ° C, 83 ° C, 89 ° C, and 92 ° C. The results showed that the ideal germination temperature is 30 ° C and for brewing it is 78 ° C. The soaking time during germination, for a good germination rate, is between 16h and 26h. In conclusion, the temperature factor is a parameter that should not be overlooked when making Tchoukoutou. Our study thus made will serve as a basis for subsequent studies in the same direction to achieve a standardized industrial production of Tchoukoutou.

The Dynamic of an Autoparametrical System With Two Coupled Pendulums Connected by SMA Spring

2008 ◽  
Author(s):  
Danuta Sado ◽  
Krzysztof Gajos
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Equations Of Motion ◽  
Type System ◽  
The Body ◽  
System Response ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Resistive Forces ◽  
Sma Spring

The nonlinear dynamics of a three degree of freedom autoparametric system with two pendulums connected by SMA (Shape Memory Alloys) spring in the neighborhood internal and external resonance is presented in this works. The system consists of the body of mass m1 which is hung on a spring and a damper, and two connected by SMA spring pendulums of the length 1 and masses m2 and m3 mounted to the body of mass m1. It is assumed, that the motion of the pendulums are damped by resistive forces. Shape memory alloys have ability to change their material properties, for example stiffness. The equations of motion have been solved numerically and there was studied the influence of temperature on the energy transfer between modes of vibrations. Solutions for the system response are presented for specific values of the parameters of system. It was shown that in this type system one mode of vibrations may excite or damp another mode, and that except different kinds of periodic vibrations there may also appear chaotic vibrations. It depends on various amplitudes of excitation, frequencies ratio and different system parameters. Also fundamental is the influence of temperature on response of the system. For the identification of the responses of the system various techniques, including chaos techniques such as bifurcation diagrams and time histories, power spectral densities (FFT), Poincare` maps and exponents of Lyapunov may be use.

Influence of temperature on the reproduction of Damalinia equi (Denny)

1963 ◽  
Vol 11 (2) ◽  
pp. 183 ◽  
Author(s):  
MD Murray
Keyword(s):  
Skin Temperature ◽  
High Temperatures ◽  
Atmospheric Temperature ◽  
Early Spring ◽  
The Body ◽  
The Sun ◽  
Hair Coat ◽  
Influence Of Temperature ◽  
Influence Of Temperature On

No development of the egg within the female Damalinia equi (Denny) occurred at 16�C. Most eggs were laid at 36�C at R.H.'s of 75% or less, but after an exposure to 44.5�C for only 1 hr females did not lay eggs. Morphogenesis proceeded to an advanced state from 27-39�C, but its completion and the subsequent hatching of the embryo only took place from 31-39�C provided the R.H. was less than 90%. A R.H. of 90% prevented hatching of the eggs. Exposure of eggs to 49�C for 2 hr was lethal. The skin temperature of the horse is influenced considerably by atmospheric temperature. The abundance of D. equi on the bodies of horses in early spring is probably due to the temperatures near the skin of the body being continuously favourable for reproduction of D. equi during the winter. Exposure to the sun can cause the temperatures within the hair coat on the upper aspects of the body to become higher than 44.5�C for more than an hour and thus can retard reproduction. The accumulative effect of repeated high temperatures could prevent an increase in the numbers of D. equi during the summer.

Carvallo. Influence de la temperature sur la fatigue des nerfs moteurs de la grenouille. Journ. de Physiol. et. de pat-hol. generale. T II p. 549 1900. Influence of temperature on fatigue of motor nerves of a frog

1901 ◽  
Vol IX (2) ◽  
pp. 205-207
Author(s):  
D. Polumordvinov
Keyword(s):  
The Body ◽  
Influence Of Temperature ◽  
Body Tissues ◽  
Influence Of Temperature On ◽  
Motor Nerves

At the present time, there is a clearly expressed tendency to examine the activity of the nerves subject to other laws than those that govern the activity of the rest of the body tissues. Since the time of the study of Bernstein, Vvedensky and Bovdich, most of the physiologists speak out for the fatigue of the nerves.

scholarly journals Statistical analysis of the influence of temperature on microstructure contact surfaces on BaTiO3-ceramics doped with Ho2O3

2014 ◽  
Vol 46 (3) ◽  
pp. 345-352 ◽  
Author(s):  
S. Jankovic ◽  
V.V. Mitic ◽  
Lj. Kocic ◽  
V. Paunovic ◽  
M. Miljkovic
Keyword(s):  
Dielectric Properties ◽  
Fractal Geometry ◽  
Quantitative Metallography ◽  
Technological Parameters ◽  
Influence Of Temperature ◽  
New Correlation ◽  
Influence Of Temperature On ◽  
Contact Surfaces ◽  
Temperature Levels ◽  
Scanning Electron

The materials based on BaTiO3 can be controlled using different technological parameters and different additives. The influence of different temperature levels of sintering (1320?C, 1350?C and 1380?C) on the size of contact area for 0.1% Ho2O3 doped BaTiO3-ceramics has been investigated. Microstructural investigations were carried out using scanning electron microscopy (JEOL-JSM 5300) equipped with EDS (QX 2000S) system. Grain size distribution was determined by quantitative metallography method. The new correlation between microstructure and dielectric properties of doped BaTiO3-ceramics based on fractal geometry and contact surface probability is recently developed. The presented results indicate that statistical model of contact surfaces is important for the prognosis of BaTiO3-ceramics microstructure and dielectric properties.

The effect of temperature on high-resolution TEM image contrast

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).

The Influence of Temperature on Successful Reproductions of Burbot, Lota Lota (L.) Under Hatchery Conditions

2010 ◽  
Vol 25 (1) ◽  
pp. 93-105 ◽  
Author(s):  
Daniel Żarski ◽  
Dariusz Kucharczyk ◽  
Wojciech Sasinowski ◽  
Katarzyna Targońska ◽  
Andrzej Mamcarz
Keyword(s):  
Lota Lota ◽  
Influence Of Temperature ◽  
Influence Of Temperature On
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