Weak points Another avenue of research was the study of the composition of the acrylo-methylamine resin. Widely used in the finishing of car bodies and also of household electrical goods, it forms a protective layer over the paint, like a varnish. In this way, it confers greater durability and hardness on the paintwork, as well as resistance to heat and other risks.
An analysis of the chemical structure of the polymer, however, showed its main weak points. Knowledge of this data led the researchers to three hypotheses to explain the effect of the eggs on the resin. The damage could be photochemical: some substance present in the eggs could be capable of absorbing sunlight, causing the degradation of the resin.
Another possibility would be that of microbiological damage: the organic material which makes up the eggs — a protein gel which guarantees protection and serves as a food stock for the embryo when the egg hatches — it could act as a substrate for the development of fungi, capable of damaging the polymer. The third hypothesis was of chemical damage: some acid substance present in the eggs could be responsible for the transformation of the resin in such a way that the acid works as a corrosive agent in the area of contact of the egg.
Acid rain Due to the sensitivity of the resin to an acid substance, the suspicion of chemical damage was the most likely right from the beginning. The pH of the rain collected was 3 — a level of acid much higher than the rains of the capital which were around pH 4.
What caught their attention was the similarity between the damage done by the acid rain and that of the dragonfly eggs. From that point onwards the researchers concentrated on studying the effects of various acids on panels covered with automobile paint, provided by Renner DuPont, and to comparing them with the damage produced by the dragonfly eggs. With a smooth stroke of the fingers on the stomach, the females liberated their eggs which were collected in a test tube containing distilled water.
Innocent eggs? Up until that point, he thought that the eggs contained some acid substance capable of damaging the resin. However, after a chemical analysis he discovered that the reaction of the eggs was not acid, but neutral. This confirmation could have knocked down the hypothesis of the acid hydrolysis of the resin, but in the end helped to reinforce it, thanks to the multi-disciplinary experience of the researchers. Involved in studies with fireflies and free radicals for more than two decades, Dr.
Bechara knew of a process that goes on as soon as the eggs are laid. Because they have small wings so they can fly. Dragonflies go on top of each other and fly because sometimes they are husband and wife staying together. If the snail had wings and could fly like a pig then yes it could eat dragonflies.
Dragonflies fly,crawl and hover. Crayfish live in the water, dragonflies dont. Dragonflies have wings, crayfish dont.
Log in. Study now. See Answer. Best Answer. Study guides. Loans 26 cards. What is forfeiture. Which of these is the best description of delinquency. Which term is defined as property that is pledged as security on a loan. This is Paula's monthly budget What percent of her expenses is spent on insurance.
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Economics 31 cards. Q: Why do dragonflies fly over cars? Write your answer Related questions. The Dragonfly Sanctuary Pond in Albuquerque, New Mexico, is the first sanctuary pond in the country and home to an amazing diversity of dragonfly and damselfly species. Across the Pacific, enthusiasts can enjoy these odonates in one of several wildlife sanctuaries in Japan created to protect dragonfly habitats and the diversity of the species.
The dragonfly does an amazing job of helping humans by controlling populations of pest insects, especially those that bug us most, such as mosquitoes and biting flies. A single dragonfly can reportedly eat anywhere from 30 to hundreds of mosquitoes per day.
They also inspire us to create new technology — from drones to artificial visual systems — based on their incredible skills at flight and vision. The least we humans can do to return the favor is support the conservation of their habitats so they can continue on for another million years. Troast, Daniel et al. Public Library Of Science Plos , doi Hedlund, Johanna S.
Frontiers In Ecology And Evolution , vol 9, Frontiers Media SA , doi Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance. Select basic ads. Create a personalised ads profile.
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