scholarly journals INSECT SPERM: THEIR STRUCTURE AND MORPHOGENESIS

1970 ◽  
Vol 44 (2) ◽  
pp. 243-277 ◽  
Author(s):  
David M. Phillips
Keyword(s):  
Insect Sperm

Spermatogenesis in the Dragonfly with Particular Reference to the Cytoplasmic Organelles

1972 ◽  
Vol 30 ◽  
pp. 110-111
Author(s):  
Sant S. Sekhon
Keyword(s):  
Endoplasmic Reticulum ◽  
Golgi Apparatus ◽  
Mature Sperm ◽  
Electron Microscopic ◽  
Cytoplasmic Organelles ◽  
Microscopic Studies ◽  
Insect Sperm ◽  
Large Round

Although there have been numerous studies concerning the morphogenetic changes accompanying the maturation of insect sperm, only a few deal with the sperm differentiation in the dragonflies. In two recent electron microscopic studies Kessel, has comprehensively treated the erlationship of microtubules to the nucleus and mid-piece structures during spermiogenesis in the dragonfly. The purpose of this study is to follow the sequential nuclear and cytoplasmic changes which accompany the differentiation of spermatogonium into a mature sperm during spermatogenesis in the dragonfly (Aeschna sp.).The dragonfly spermatogonia are characterized by large round nuclei. Loosely organized chromatin is usually unevenly distributed within the spermatogonial nuclei. The scant cytoplasm surrounding the nucleus contains mitochondria, the Golgi apparatus, elements of endoplasmic reticulum and numerous ribosomes (Fig. 1).

scholarly journals Protein of insect sperm mitochondrial crystals. Crystallomitin.

1977 ◽  
Vol 73 (3) ◽  
pp. 594-600 ◽  
Author(s):  
B Baccetti ◽  
R Dallai ◽  
V Pallini ◽  
F Rosati ◽  
B A Afzelius
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Dodecyl Sulfate ◽  
Filament Bundles ◽  
Cross Links ◽  
Insect Sperm ◽  
Main Period ◽  
20 Nm ◽  
Derivatives Of

Mitochondrial derivatives of insect sperm usually contain a crystalline protein that shows a 45-nm main period, made up of 20-nm subperiods, determined by the coiling of filament bundles. Filaments are 2 nm thick and have a globular appearance. The crystals contain two main polypeptides, 52,000 and 55,000 daltons. These polypeptides are closely related, contain a high percentage of proline, and are insoluble in sodium dodecyl sulfate due to disulfide cross links. We suggest for this class of protein the name crystallomitin.

Structure and Evolution of Insect Sperm: New Interpretations in the Age of Phylogenomics

2016 ◽  
Vol 61 (1) ◽  
pp. 1-23 ◽  
Author(s):  
Romano Dallai ◽  
Marco Gottardo ◽  
Rolf Georg Beutel
Keyword(s):  
Insect Sperm

Chemosterilisation of the red bollworm Diparopsis castanea Hmps. (Lep., Noctuidae): effects of certain s-triazines and a carbamate insecticide

1971 ◽  
Vol 61 (2) ◽  
pp. 351-355 ◽  
Author(s):  
D. G. Campion
Keyword(s):  
Fertility Treatment ◽  
Carbamate Insecticide ◽  
Insect Sperm

Sublethal topically applied doses of the carbamate insecticide carbaryl and injection of certain s-triazine chemosterilants to female Diparopsis castanea Hmps. enhanced the rate of oviposition without reducing fertility. Treatment of male moths with carbaryl and certain s-triazines often caused an increase in mating disfunction expressed as an absence of sperm from the spermatheca after an apparently normal mating, permanent copulation or spontaneous extrusion of a spermatophore. No evidencewas found for a direct sterilising action of the chemosterilants against the insect sperm.

Diversity of microtubular doublets in insect sperm tails: A computer-aided image analysis

1991 ◽  
Vol 19 (4) ◽  
pp. 282-289 ◽  
Author(s):  
B. A. Afzelius ◽  
P. L. Bellon ◽  
R. Dallai ◽  
S. Lanzavecchia
Keyword(s):  
Image Analysis ◽  
Computer Aided ◽  
Insect Sperm

The importance of insect sperm: Sperm ultrastructure of Hermetia illucens (black soldier fly)

2019 ◽  
Vol 59 ◽  
pp. 44-50 ◽  
Author(s):  
Retha C.M. Kotzé ◽  
Nolan Muller ◽  
Lizette du Plessis ◽  
Gerhard van der Horst
Keyword(s):  
Sperm Ultrastructure ◽  
Black Soldier Fly ◽  
Hermetia Illucens ◽  
Insect Sperm

scholarly journals Sperm Viability Matters in Insect Sperm Competition

2005 ◽  
Vol 15 (3) ◽  
pp. 271-275 ◽  
Author(s):  
Francisco Garcı́a-González ◽  
Leigh W. Simmons
Keyword(s):  
Sperm Competition ◽  
Sperm Viability ◽  
Insect Sperm
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