V②? Steroids. More than 100 kinds of 3- hydroxysteroid compounds have been isolated from marine organisms such as fish, sponges, crustaceans, echinoderms and seaweeds. An organism can usually contain several sterols. These substances are pheromones or have medicinal effects. For example, the molting hormone released by the female crab before molting is a sterol, which can induce the male crab to protect itself from molting and mate after molting; The saponin contained in starfish is a steroid containing sulfuric acid group and sugar, which has cytotoxicity, hemolysis and antiviral activity.
③? Non-isoprene compound. Most of them are non-isoprene compounds produced in the process of fatty acid biosynthesis or metabolism, and some of them are acetylene-containing compounds, aliphatic compounds, sulfur-containing compounds and so on. In terms of functional groups and molecular skeletons, they are completely different from these compounds from terrestrial organisms. The pheromone released by the female gametophyte of ladybug. Can attract male gametophytes to mate. The debrominated sea urchin and prostaglandin contained in Sargassum and gorgonian have significant pharmaceutical activities, respectively.
④? Aromatic compounds A variety of bromophenol compounds can be separated from marine organisms such as sponges and seaweeds (especially red algae such as attapulgite, Arthrobacter and polychaetes). For example: tribromophenol, diphenol ether, triphenol ether, etc. Separated from algae, sponges, worms, etc. Of the arthropoda family; Bromopyrrole compounds were separated from sponge. They all have different degrees of antibacterial activity and can be used as drugs.
⑤? Nitrogen compounds. The secondary metabolites of marine organisms contain many nitrogen-containing compounds, including special amino acids with simple structure. For example, kainic acid isolated from red algae is an effective anthelmintic agent; Alginic acid isolated from kelp has the effects of lowering blood lipid and blood pressure. Marine animals also contain many toxic nitrogen-containing compounds with complex structures, such as tetrodotoxin isolated from puffer fish, which is the defense pheromone of this creature. It is often used to study the excitability of nervous system and as a drug to relieve pain in advanced cancer. Nereistoxin isolated from Nereis contains nitrogen and sulfur, which is toxic to fish and has insecticidal properties. According to its chemical structure, an effective pesticide for rice field was synthesized. Use Saxifraga as bait. Results Saxifraga toxin was isolated from both of them, and its toxicity was similar to tetrodotoxin. Suruga toxin isolated from Japanese oriental snail in Suruga Bay, Japan, is a defense communication substance. ? Rock is a naturally occurring aggregate composed of one or more minerals with a certain structural structure, and a few of them contain biological remains or remains, which are naturally occurring mineral or glass aggregates with a stable appearance and are combined together in a certain way. It is the material basis of the crust and upper mantle. Among them, rocks mainly composed of single minerals are called single minerals, such as limestone, and more than 95% are composed of calcite. A rock composed of two or more minerals is called a multi-mineral rock, such as granite, which is composed of feldspar, quartz and mica. In addition, it can be divided into magmatic rocks, sedimentary rocks and metamorphic rocks according to their genesis. Among them, magmatic rocks are rocks formed by high temperature condensation of molten magma on the surface or underground, also known as igneous rocks or extrusive rocks; Sedimentary rocks are the products of weathering, biological action and volcanism under surface conditions, and they are transported, deposited and consolidated by external forces such as water, air and glaciers. Metamorphic rocks are rocks formed by metamorphism due to changes in geological environment, which are formed by pre-existing magmatic rocks, sedimentary rocks or metamorphic rocks. ? Traces (i.e. fossils). According to the origin, structure and chemical composition of rocks, rocks can be divided into three categories: sedimentary rocks, magmatic rocks (also known as igneous rocks) and metamorphic rocks. The material composition, texture, structure, classification and nomenclature, formation conditions, distribution law, genesis, metallogenic relationship and evolution process of rocks have become the main contents of geologists' research and an important basic discipline in geological science-petrology. The diversity and specificity of chemical structures of marine metabolites are incomparable to terrestrial organisms. By studying their structures and physiological behaviors, we can further understand the chemical basis of interdependence of marine organisms and dependence between different species. From the distribution of these special compounds in various organisms, we can explore the chemical characteristics of biological evolution and use them as the basis for biochemical classification. In order to develop and utilize marine drug resources, coastal countries have successively set up special research institutions, conducted a lot of drug screening work on marine biological metabolites, and identified some relatively effective antibacterial, insecticidal, antitumor and anticancer compounds, providing a new way for the preparation of new drugs. Coastal sedimentary rocks are formed in a special tropical environment. As the name implies, beach rock is a rock that gradually developed in the ancient beach or modern beach environment. From the sedimentary structure, it has the characteristics of beach deposition, generally inclined to the sea, with rough material composition, a large number of shells and their fragments, rich in various microfossils, mostly calcareous cementation, obvious bedding, usually intermittent distribution, often parallel to the coast. At present, the observed beach rocks are slightly higher than modern beaches and are often destroyed by waves.
How to choose a new the legendary swordsman mobile game 105 pet? Pets of 105 will greatly improve players, and different pet