Thuốc trừ sâu đóng vai trò như các phân tử tín hiệu Trong chương này chúng ta tập trung vào kích thích tố, kích thích tố, và kairomons. Chất độc, chẳng hạn như dioxin và các chất độc nhiều, hành động bằng cách can thiệp với hệ thống tín hiệu, gây ra các tế bào phân chia. Cũng có thể gây ra gen để ghi RNA, cũng như các chất độc thần kinh và gây trở ngại cho hoạt động của các phân tử tín hiệu. Điều này được mô tả trong các chương khác. . | chapter seven Pesticides that act as signal molecules In this chapter we concentrate on hormones pheromones and kairomons. Toxicants such as the dioxins and the many poisons act by interfering with the signal systems causing cells to divide. The can also cause genes to transcribe RNA as well as the nerve poisons and interfere with the action of signal molecules. This is described in other chapters. Insect hormones Much of the following description is based on Dhadialla et al. 1998 Eto and Kuwano 1992 Gullan and Cranston 2000 Rockstein 1978 Yu and Terriere 1974 and Zeleny et al. 1997 . Insect endocrinology Many details of the anatomy and biochemistry of insect development from egg to adult are known. Growth and development are strictly regulated by hormones and hormone concentration relative and absolute is vital for this to proceed correctly. The hormones control cuticle synthesis molting sexual maturation color differentiation reproduction etc. The endocrine organs of insects are of two types neurosecretory cells within the nervous system and specialized endocrine glands such as the corpora allata the corpora cardiaca and the prothoracic glands. Corpora cardiaca are a pair of organs closely associated with the main vessel aorta . Corpora allata and the prothoracic glands are more diffuse glandular bodies. Molting which is defined as the shedding of an outer covering as part of a periodic process of growth is central to the development of insects. Release of ecdysteroids or molting hormones from the prothoracic glands is controlled by a neuropeptide called the prothoracicotropic hormone PTTH produced by neurosecretory cells and released by corpora cardiaca. 2004 by Jorgen Stenersen The ecdysteroids are responsible for cellular programming in cooperation with the juvenile hormones secreted from the corpora allata. The juvenile hormones JHs regulate the result of a molt whether a new larva or a pupa will be the next stage following the molt. When the amount
