PHYSIOLOGICAL CONSEQUENCES OF THE EXPERIMENTAL REMOVAL OF THE CHORION (MATERNAL CUTICLE) FROM NEW LAID EGGS OF THE HOUSE CRICKET, ACHETA DOMESTICUS (ORTHOPTERA: GRYLLIDAE)

1978 ◽  
Vol 110 (5) ◽  
pp. 551-555
Author(s):  
J. E. McFarlane
Keyword(s):  
Water Absorption ◽  
Room Temperature ◽  
Acheta Domesticus ◽  
Experimental Results ◽  
Salt Solutions ◽  
House Cricket ◽  
Potassium Biphthalate ◽  
Experimental Removal

AbstractWhen new laid eggs of the house cricket are treated with a potassium biphthalate buffer (0.05 M) at pH 4.01 for 1 h, followed by a Na2CO3 solution at pH 11.0 for 22 h at room temperature, the chorion lifts off the surface of the egg; by cutting off the end of the stretched chorion, the dechorionated egg may be pushed out of the shell. Dechorionated eggs behave in a different manner towards sucrose and salt solutions than do intact eggs. These and other experimental results are discussed in relation to the physiology of water absorption.

Crushed Stone Value of Aggregate in Asphalt Mixture Test for Different Temperature

2014 ◽  
Vol 584-586 ◽  
pp. 1992-1995
Author(s):  
Chuang Min Li ◽  
Tao Wang ◽  
An Liu
Keyword(s):  
Water Absorption ◽  
Internal Structure ◽  
Room Temperature ◽  
Asphalt Mixture ◽  
Selection Method ◽  
Experimental Results ◽  
Crushed Stone ◽  
Higher Temperature

Through the analysis of different temperature crushed stone value, it is found that the specification required by asphalt aggregate selection method is not suitable for all materials. 3 kinds of aggregate are selected and make the crushed stone value test; the different temperature experimental results show that the crushed stone value at room temperature may be higher or lower than that at higher temperature. So, higher temperature crushed stone value are likely to pass or fail whatever normal crushed stone value is qualified or not. The relationships among crushed stone value of aggregate at different temperature and its water absorption, lithology and internal structure are discussed and analyzed in the paper to explain this phenomenon.

TYROSINASE AND THE STRUCTURE OF THE EGG SHELL OF ACHETA DOMESTICUS (L.)

1961 ◽  
Vol 39 (1) ◽  
pp. 1-9 ◽  
Author(s):  
J. E. McFarlane
Keyword(s):  
Water Absorption ◽  
Normal Development ◽  
Acheta Domesticus ◽  
House Cricket ◽  
Egg Shell

The endochorion of the egg of the house cricket, Acheta domesticus (L.), is composed, in part, of imbricated scales. These scales are revealed in the pattern of melanization of the chorion that results on immersing eggs in aqueous tyrosine before they have begun to absorb water. Such treatment prevents the normal breaking up of the endochorion, but does not prevent water absorption or normal development of the eggs. Failure of the endochorion to fragment in the usual way affects the structure of the underlying lipoid layer of the serosal cuticle.

REVISED CURVES FOR WATER ABSORPTION BY THE EGGS OF THE HOUSE CRICKET, ACHETA DOMESTICUS (L.)

1964 ◽  
Vol 42 (2) ◽  
pp. 239-243 ◽  
Author(s):  
J. E. McFarlane ◽  
P. J. S. Furneaux
Keyword(s):  
Water Absorption ◽  
Acheta Domesticus ◽  
House Cricket ◽  
Initial Water

Two features of the changing hydration of the egg after the initial water absorption period are described, and possible causes of these features are discussed in relation to changes occurring during this period in the shell.

Electron investigations of rhabdovirus-like particles in mexican bean beetles and crickets

1978 ◽  
Vol 36 (2) ◽  
pp. 378-379
Author(s):  
J. R. Adams ◽  
G. J Tompkins ◽  
A. M. Heimpel ◽  
E. Dougherty
Keyword(s):  
Biological Control ◽  
Integrated Pest Management ◽  
Pest Management ◽  
Developmental Stages ◽  
Management Program ◽  
Acheta Domesticus ◽  
Epilachna Varivestis ◽  
House Cricket ◽  
Similar Morphology ◽  
Bean Beetle

As part of a continual search for potential pathogens of insects for use in biological control or on an integrated pest management program, two bacilliform virus-like particles (VLP) of similar morphology have been found in the Mexican bean beetle Epilachna varivestis Mulsant and the house cricket, Acheta domesticus (L. ).Tissues of diseased larvae and adults of E. varivestis and all developmental stages of A. domesticus were fixed according to procedures previously described. While the bean beetles displayed no external symptoms, the diseased crickets displayed a twitching and shaking of the metathoracic legs and a lowered rate of activity.Examinations of larvae and adult Mexican bean beetles collected in the field in 1976 and 1977 in Maryland and field collected specimens brought into the lab in the fall and reared through several generations revealed that specimens from each collection contained vesicles in the cytoplasm of the midgut filled with hundreds of these VLP's which were enveloped and measured approximately 16-25 nm x 55-110 nm, the shorter VLP's generally having the greater width (Fig. 1).

Study on Waterproof and Water-Resistant Properties of Gypsum

2012 ◽  
Vol 476-478 ◽  
pp. 1585-1588
Author(s):  
Hong Pan ◽  
Guo Zhong Li
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Portland Cement ◽  
Water Absorption ◽  
Ordinary Portland Cement ◽  
Experimental Results ◽  
Softening Coefficient

The comprehensively modified effect of cement, VAE emulsion and self-made acrylic varnish on mechanical and water-resistant properties of gypsum sample was investigated and microstructure of gypsum sample was analyzed. Experimental results exhibit that absolutely dry flexural strength, absolutely dry compressive strength, water absorption and softening coefficient of gypsum specimen with admixture of 10% ordinary Portland cement and 6% VAE emulsion and acrylic varnish coated on its surface can respectively reach to 5.11MPa , 10.49 MPa, 8.32% and 0.63, respectively.

Effect on Vulcanized Rubber Compounds of Immersion in Boiling Water

1931 ◽  
Vol 4 (3) ◽  
pp. 426-436
Author(s):  
K. J. Soule
Keyword(s):  
Water Absorption ◽  
Room Temperature ◽  
Anomalous Behavior ◽  
Boiling Water ◽  
Vulcanized Rubber ◽  
Rubber Compounds ◽  
Different Temperatures ◽  
Actual Change

Abstract Further work is very desirable on the effect of different accelerators, antioxidants, and fluxes. It is possible that their study will throw more light on the mechanism of the swelling phenomena, and also help to explain the anomalous behavior of some of the fillers tested. It would also seem to be worth while to study the action of a few selected stocks in water, at several temperatures between room temperature and 100° C., to determine if the water absorption and swelling merely increase with rising temperatures, or whether there might be an actual change in behavior at different temperatures.

Bending Ratcheting Behavior of Zircaloy-4 Alloy at Room Temperature

2013 ◽  
Vol 690-693 ◽  
pp. 1713-1717 ◽  
Author(s):  
Hong Qiang Guo ◽  
Hua Li ◽  
Yi Chen Sun ◽  
Wei Wei Yu
Keyword(s):  
Room Temperature ◽  
Stress Amplitude ◽  
Experimental Results ◽  
Strain Level ◽  
Mean Stress ◽  
Cyclic Tests ◽  
Ratcheting Strain

In this paper, a series of bending cyclic tests under stress controlled were conducted at room temperature on Zircaloy-4 (Zr-4) to investigate its bending ratcheting behavior. The effects of mean stress and stress amplitude on the bending ratcheting behavior were experimentally studied, respectively. The experimental results show that the ratcheting strain of the material is very sensitive to mean stress and stress amplitude. It can be concluded that ratcheting strain level increases with increasing mean stress and stress amplitude.

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