Molting Shrimp
Molting Shrimp
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Pesticides Use and Impact on Beings
Many pesticides of different chemical composition, e.g. organochlorine compounds, organophosphates, pyrethroids, neonicotinoids, biological insecticides, antifeedants are used in this world to combat the destruction of vegetation in the farming land. The outcome are huge success in this trend, but it had a bad and pestilent disaster on both the environment as well as in living beings.DDT for example was used to a great effect among populations s to control mosquitoes spreading malaria and lice transmitting typhus , resulting in dramatic reductions in the incidence of both disease. But this and other pesticides may cause cancer and that their agricultural use was a threat to wildlife, particularly birds. They were shown to reduce the fertility in males exposed to them as well as their offspring,. In consequence they were banned in the US in 1972.in agricultural use worldwide under the Stockholm convention in spite of its limited current use today.
The question that arises continuously in the medical field is that, does the effect appear to be the result of changes in the DNA structural sequence, which inevitably may cause inheritable effect(s) other than mutation. The drop in the sperm count in the males was taken as an obvious damage to DNA, though many are not convinced by the result. The sperm is abnormal and few are infertile. Though the sperm count declines, yet off springs are still capable to reproduce. The males of these are still capable of breeding and carry the same symptoms of their parents.
The exposure to DDT in particular is associated with early pregnancy loss, a type as shown in a study involving Chinese textile workers.. It is also typically observed in women living in homes sprayed with DDT, There is a positive, monotonic, exposure-response association between preconception serum total DDT and the risk of subsequent early pregnancy loss. There is an alarming evidence that the females of highly exposed women may have more difficulty getting pregnant
Organochmicals in general, are toxic to a wide range of animals in addition to insects. They are highly toxic to aquatic life, including crayfish sea shrimps and many species fish but less toxic to other mammals Mostly they are reproductive toxicants for certain bird’s species and it is the major reason for the decline of flacons, birds of prey and other species.
Insect growth regulators are now developed to affect the target insect differently and also are much less likely to be toxic to mammals. One approach is the use of insect growth regulators which interferes with the ability of an insect to develop normally. These can interfere with the development of an insect in two ways. One is to disrupt the normal molting process. As insects feed and grow ,insects must shed their skin periodically that prevent the insect from shedding its skin properly or from forming the new skin at the right time. Both of these processes are critical for normal molting, and an insect eventually will die if it is unable to molt properly
The synthetic pyrethroids affect insect nervous systems Imidacloprid represents another insecticide class, the chloronicotinyls. Imidacloprid blocks the receptor sites to which Acetyl choline attaches, preventing its removal. However, most other traditional insecticides also attack the insect nervous system in some fashion or other. In all of these cases, nerve impulses are unable to travel normally from cell to cell.
In all instances, current scientific research is continuously updating and producing other agrochemicals which will inevitably have less if not all drastic side effects to living beings
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