Viruses are small infectious agents that replicate only inside the living cells of other organisms, Viruses infect all types of life forms from animals, plants and bacteria. The average of virus is about one hundredth the size of average bacterium. Viruses spread in many ways; viruses in animals can be carried by blood-sucking insects. Viruses can be carried in the air and spread by coughing and sneezing, food, water and person to person contact are also means of transmitting a virus. Several viruses inc. H.I.V.
Bacterial infections are normally treated with a course of antibiotics. Viruses are made up of genes and proteins that spread throughout the body by invading the body’s own cells so they can reproduce and multiply in the body. They use the body’s cells as a host because they are unable to multiply on their own. They are normally spread directly from human to human. Viruses can be very tough and there are not many effective medicines available for viral diseases.
Viruses: A virus needs a host cell to replicate. Viruses are immune to antibiotics and are spread in the air or by direct contact, which mean they probably are more commonly caught from each other. They can lead to serious or sometimes deadly diseases such as aids. Virus can also cause chickenpox, common cold and influenza. Parasites: A parasite is an organism that lives in another organism.
Feral pigs are descendants of various species of these introduced pigs, which became feral. There is estimated to be 23 million of these feral animals Australia wide. They are mainly located within Queensland, and across the top of the Northern Territory. This essay will answer the questions of; how feral pigs affect the native organisms, how science is helping to reduce this species, how affective the treatments are is and how these methods impact the environmental and economical factors. Feral pigs have a lot of impact on native species, both animals and plants.
Noah Taylor Jason Stanwood Gifted and Talented Science 7B March 1, 2012 Mad Cow Disease Makes You Not Want To Eat Meat In 1986, Bovine Spongiform Encephalopathy (BSE), commonly known as Mad Cow Disease, was first diagnosed in Britain. Epidemiologists conducted studies that suggested that the source of BSE was contaminated cattle feed. Several cows became sick. Some suspect that they were fed sheep that were infected with Scrapie, a fatal disease that affects the nervous system. It took several years for the government to admit that humans could die from the infected cows.
Drug manufacturers test medications on animals after they have been injected with viruses and diseases to see if the medications work on the animals. There are many companies who use animal research to test their products; unfortunately these organizations do not look for alternatives besides animal testing. If these atrocious acts were committed outside laboratories, they would be felonies. But animals suffer and die every day in laboratories with little or no protection from cruelty. It is immoral to
Bovine Spongiform Encephalopathy (BSE) • BSE or bovine spongiform encephalopathy is a neurological disease of cattle. • It is believed to be transmitted to cattle from ground up meat and bone that had been infected from sheep products that were fed to the cattle. • The outbreak grew as young calves were fed meat and bone meal that was infected with the prion disease. • In order for the next
The Biological approach assumes all mental disorders are due to physical causes within the body changes due to one in four factors such as infection, genetics, bio chemistry and brain abnormality. Infection is one of the four factors that can cause abnormality. Bacterial or viral infections can cause psychological symptoms which are also known as a syndrome. There is supportive evidence for infection causing abnormalities as 14% of sufferers of psychotic disorders such as schizophrenia are linked with exposure to an influenza virus, when in the womb of their mother. This suggests that bacteria/viruses can cause psychological syndrome to occur.
Malaria is a contagious disease caused by five different Plasmodium parasites that have similar life cycles.1 These parasites have a complex life cycle that requires an insect vector most commonly female Anopheles mosquito and a human host. The life cycle of the malaria parasite is composed of human stages and mosquito stages.2 The discovery of the first stage during which the parasites develop in the liver before entering the blood stream was done by Henry Shortt and Cyril Garnham in 1948. In 1982, another discovery was made by Wojciech Krotoski demonstrating the presence of dormant period in the liver that occurs in the final stage. These discoveries play an important role in the understanding of the life cycle of malaria prasites.1 Moreover,
Tynisha Gales February 6, 2012 Lyme Disease Imagine you are going camping or on a picnic with your family. You all having a good time but you may not notice that you may be in danger: not able to see the smallest bug that can change your life forever. How does Lyme disease affect the human brain? Lyme disease is a Bacteria infection caused by a bite of a black-legged tick. The original name of this tick is called Borrelia Burgdorteri, and black-legged ticks carry this infection if they are bitten by a mouse or deer that has already been infected.