Research paper of Favorite Organism Example | Topics and Well Written Essays - 1500 words

Of Favorite Organism - Research Paper Example Their physiological characteristics are different and interesting. In this essay various aspects of elephants will be discussed. Taxonomic classification The family to which elephant belongs is Elephantidae. It is the only family under the order Proboscidea. The domain is living, kingdom is Animalia, phylum is Chordata and class is Mammalia. Under the family Elephantidae, there are 2 genuses and they are Loxodonta or African Genus and Elephas or Asian genus. There are 2 species: africana or African species and maximus or Asian species. The subspecies in the former are africana and cyclotis and in the later are indicus, borneensis and sumatranus. Elephants are the only living members of the Proboscidea order (Fowler and Mikota, 2006). Description of the organism Elephants are mammals. The two main species are African elephant and Asian elephant. Extinct species of the order Proboscidea are mastodons and mammoths. Currently, elephants are the largest living terrestrial animals. A male elephant can reach a height of 4 m and can weight upto 7000 kg (Fowler and Mikota, 2006). African elephants have larger ears and backs that are concave. On the other hand, Asian elephants have smaller ears and backs that are convex. ... The Asian elephant is considered endangered and the African elephant is considered as vulnerable. These animals are poached for their tusks because of their ivory value. Elephants are also at threat because of habitat destruction and conflicts with people in the local region. In Asia, these animals are used for heavy work. They are also displayed in circuses and zoos. They are also featured in ceremonies and cultural events. Asian elephants have smoother skin, only one extension at the tip of the trunk and their abdomen is horizontal. The molars have narrower looped ridges in the Asian elephant when compared to African elephant which is diamond shaped (Shoshani, 2005). Other than these features, the Asian elephant has dorsal bumps on the head and also some depigmentation patches. Status of the organism The Asian elephant is on the crux of becoming endangered because of severe poaching on the animal for the purpose of tusk. Ivory can be derived from the tusk and it has a very good com mercial value. Ivory is used to make different ornaments and objects. The leather of the elephant is also used for several purposes. African elephant on the other hand is not endangered but is called vulnerable (Fowler and Mikota, 2006). Unique physiological characteristics The word elephant is derived from the Latin word "elephantus". Of all the terrestrial living animals, elephant is the largest. The height of an African elephant is about 3-4 meters and that of an Asian elephant is 2- 3.5 meters. The former weighs between 4000- 7000 kgs and the latter weighs between 3000- 5000 kgs. Males are larger than females. The skeleton of an elephant has 326- 351 bones (Fowler and Mikota, 2006). The flexibility of the backbone of an

Positron Emission Tomography Essay Example | Topics and Well Written Essays - 250 words

Positron Emission Tomography - Essay Example The nucleus of an atom has nucleons and the protons collectively known as nucleon. The mass number is the total number of nucleons present in a nucleus. A nuclide has the following composition, Atomic number denoted by Z, the neutron number denoted by N and the mass number denoted by A. isotopes are atomic species having identical properties in chemical composition (Z) but different mass numbers (A). The atom’s outermost orbital electrons are involved in the chemical reactions and the chemical behavior will not change when the compound is labeled with radioactive isotope. In addition, the nuclear radioactive characteristics are not affected by the chemical composition of the atom. When a small volume of a system comprises of numerous particles that are confined together, then the system becomes unstable. An unstable nucleus then becomes stable by transforming itself through emission of particles and photons. This process is what is termed as radioactive decay, and when the nuc lides undergo through a similar process, it is called radionuclide. The radioactivity studies form the basis to understand the atomic nucleus. Initial unstable nucleus in the decay of radioactive nuclides is known as the parent and daughter is the final nucleus that is more