![Low dose @b-emitter source induces sexual reproduction instead of fragmentation in an earthworm, Enchytraeus japonensis [An article from: Journal of Environmental Radioactivity]](https://www.ebooknetworking.net/books/noimage.jpg)
Low dose @b-emitter source induces sexual reproduction instead of fragmentation in an earthworm, Enchytraeus japonensis [An article from: Journal of Environmental Radioactivity]
Book Details
Author(s)Y. Miyachi, T. Kanao, T. Okamoto
PublisherElsevier
ISBN / ASINB000RR3SHS
ISBN-13978B000RR3SH3
MarketplaceIndia 🇮🇳
Description
This digital document is a journal article from Journal of Environmental Radioactivity, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
We examined whether background radiation, or radiation at a slightly higher level, plays a role in the reproduction of a terrestrial earthworm. Enchytraeus japonensis a recently described terrestrial oligochaete, reproduces asexually by fragmentation and subsequent regeneration. Following radiation exposure in which the worms were subjected to a ^3^2P @b-emitter source at 15 times the background dose rate (4.5@mGy/h), a statistically significant decrease in the number of fragmentations was observed as compared with the sham controls. At that time, in a stained preparation with haematoxylin and eosin (HE), sexual reproduction occurred instead of asexual fragmentation, and mature oocytes were observed in the body of grown worms. However, increasing the radiation dose rate by 30@mGy/h resulted in the complete disappearance of the radiation-induced effects, i.e., fragmentation again occurred after 14h. The results of this study indicate that a lower dose of radiation may be essential to achieve sexual reproduction, inducing an inhibition of fragmentation (asexual reproduction), but at higher, more cytotoxic doses of radiation these effects are negated.
Description:
We examined whether background radiation, or radiation at a slightly higher level, plays a role in the reproduction of a terrestrial earthworm. Enchytraeus japonensis a recently described terrestrial oligochaete, reproduces asexually by fragmentation and subsequent regeneration. Following radiation exposure in which the worms were subjected to a ^3^2P @b-emitter source at 15 times the background dose rate (4.5@mGy/h), a statistically significant decrease in the number of fragmentations was observed as compared with the sham controls. At that time, in a stained preparation with haematoxylin and eosin (HE), sexual reproduction occurred instead of asexual fragmentation, and mature oocytes were observed in the body of grown worms. However, increasing the radiation dose rate by 30@mGy/h resulted in the complete disappearance of the radiation-induced effects, i.e., fragmentation again occurred after 14h. The results of this study indicate that a lower dose of radiation may be essential to achieve sexual reproduction, inducing an inhibition of fragmentation (asexual reproduction), but at higher, more cytotoxic doses of radiation these effects are negated.
