The Columbian Timber Beetle, Corthylus columbianus (Coleoptera: Scolytidae): V. A Description of the Mycetangia

1967 ◽  
Vol 99 (1) ◽  
pp. 54-58 ◽  
Author(s):  
Ronald L. Giese
Keyword(s):  
Transmission Mechanism ◽  
Storage Site ◽  
Vegetative Cells ◽  
Coiled Tube ◽  
Male Beetle

AbstractThe mycetangia of Corthylus columbianus Hopkins are described. These structures lay immediately below the integument of the pronotum, one in each ventrolateral region. Each mycetangium is a coiled tube 4.69 ± 0.35 mm. in length, cream colored, opening into the anterior coxal cavity. Mycetangia occur only in the male beetle and provide the overwintering storage site and transmission mechanism for associated microorganisms. Smears and cultures of the mycetangia were positive for ascospores and vegetative cells of a yeast, Pichia sp., which coincides with the microsymbiote dominant in developmental chambers of the larvae.

Release of Neurosecretion in the Crayfish Sinus Gland

1968 ◽  
Vol 26 ◽  
pp. 150-151
Author(s):  
Richard R. Shivers
Keyword(s):  
Chemical Nature ◽  
Storage Site ◽  
Neurosecretory Granules ◽  
Sinus Gland ◽  
Diameter Class ◽  
Dense Membrane ◽  
Neurohemal Organ ◽  
Dense Vesicles

The sinus gland is a neurohemal organ located in the crayfish eyestalk and represents a storage site for neurohormones prior to their release into the circulation. The sinus gland contains 3 classes of dense, membrane-limited granules: 1) granules measuring less than 1000 Å in diameter, 2) granules measuring 1100-1400 Å in diameter, and 3) granules measuring 1500-2000 Å in diameter. Class 3 granules are the most electron-dense of the granules found in the sinus gland, while class 2 granules are the most abundant. Generally, all granules appear to undergo similar changes during release.Release of neurosecretory granules may be initiated by a preliminary fragmentation of the “parent granule” into smaller, less dense vesicles which measure about 350 Å in diameter (V, Figs. 1-3). A decrease in density of the granules prior to their fragmentation has been observed and may reflect a change in the chemical nature of the granule contents.

2008 Economy Results: The End of the "Fat" Years

2009 ◽  
pp. 4-25 ◽  
Author(s):  
B. Zamaraev ◽  
A. Kiyutsevskaya ◽  
A. Nazarova ◽  
E. Sukhanov
Keyword(s):  
Economic Crisis ◽  
National Economy ◽  
Banking System ◽  
Housing Markets ◽  
Transmission Mechanism ◽  
Economic Conditions ◽  
Basic Change ◽  
Russian Economy ◽  
The World

The article analyzes the current economic conditions in Russia. Succession, distribution and the transmission mechanism of the world financial and economic crisis to the Russian economy are considered in this article as well as the changes in the banking system, share and housing markets. Production, consumption and investment on the boundary of 2008-2009 are described. The conclusion about the basic change of conditions of national economy development is presented.

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