Presence of stable carbon centric free radicals and ferromagnetic elements in the antennae and the wings of nocturnal silk moth: a magnetic nanostructure for magneto sensing

Roy, Manas ; Meena, Sunil Kumar ; Singh, Sushil Kumar ; Sethy, Niroj Kumar ; Bhargava, Kalpana ; Sarkar, Sabyasachi ; Das, Mainak (2013) Presence of stable carbon centric free radicals and ferromagnetic elements in the antennae and the wings of nocturnal silk moth: a magnetic nanostructure for magneto sensing Materials Express, 3 (1). pp. 43-50. ISSN 2158-5849

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Official URL: http://www.aspbs.com/mex/contents_mex31.htm#v3n1

Related URL: http://dx.doi.org/10.1166/mex.2013.1104

Abstract

This work addresses an interesting, interdisciplinary problem of nature- “the mechanism by which animal senses the earth's magnetic field and navigate”. Currently there are two existing theories trying to explain, “How the animal senses the magnetic field of earth”. One theory is based on the presence of biogenic magnetic materials in the body of the animals. Such magnetic materials which are present inside the body, orients itself according to the earth's weak magnetic field and convey the information to the nervous system to develop the navigational map. The second theory is based on a light dependent photochemical reaction. A photochemical reaction leads to the generation of radical pairs, which helps in sensing the weak magnetic field of the earth. In this work, we are proposing a new model of magnetoreception. Unlike the existing radical pair system of magnetoreception, where a light-dependent reaction is essential to generate free radicals, here we show the presence of a large pool of stable carbon-centric free radicals in the nano-domains of the antennae and the wings of silk moth. This stable pool of carbon-centric free radicals is intrinsic in the nano-domains of these anatomical structures and responds to weak magnetic fields similar to that of Earth's (50 μT) even in the absence of light. Hence we are proposing that nocturnal animals in their navigation could utilize such a light independent mechanism. We further observed the presence of ferromagnetic elements (Fe, Ni, Co, Mn) in these structures. In conclusion, we have discussed how carbon centric free radicals along with other ferromagnetic components present in the antennae and the wings of the nocturnal silk moth, might help them to avoid the bats.

Item Type:Article
Source:Copyright of this article belongs to American Scientific Publishers.
Keywords:Antennae; Carbon Radical; Electron Spin Resonance; Ferromagnetism; Magneto-Sensing; Nocturnal Insect; Paramagnetism; Silk Moth; Vibrating Sample Magnetometer; Wing
ID Code:98314
Deposited On:14 May 2014 08:48
Last Modified:14 May 2014 09:00

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