Rodent

IACUC guidelines for proper rodent euthanasia, a lethal overdose of CO2, isoflurane, chemical anaesthetic can be administered. The type of agent used for lethal overdose mainly depends on cost and efficiency for all three methods are proven to induce death. After overdose, euthanasia must be confirmed to assure proper death (thus, no extreme suffering). Confirmation can happen via decapitation or extraction of heart, lungs, and/or brain (vital tissue harvest) for rodents weighing more than 500…

rats and humans is closer than one may expect, making rats ideal for many areas of research. Over the years, rodents have been altered genetically until scientists, in the last twenty years, came up with a new development called “transgenic mice”. A type of mouse or rat that has some genetics closely resembling the genes that are responsible for causing certain human conditions. These rodents are bred so scientists can specifically control which genes are active or not. Researchers have a good…

Bubonic Plague Still Kills Thousands Summary and Analysis The Bubonic Plague was once a disease that killed half of Europe population. Although it has been a long time since the disease affected Europe, researchers say that the disease is still in parts of the world. In Congo more than 10,000 people have gotten the disease throughout the last decade. Cases of the Bubonic Plague are slowly coming into the westward United States. The bacteria yersinia pestis started the Bubonic Plague and…

The scarce resource of food and grain attract a larger number of rodents as the stockpiles of food shrunk while the population of rodents grew. The Great Famine also contributed to an increase of land tax as many historians suspect that wealthy lords tried to increase their income as the cost of buying food has sky rocketed since the beginning of the…

Facial expression Langford et al. (2010) created the “mouse grimace scale” which is the first scoring system for facial categorization in rodents and also the firs study of facial expressions of pain in nonhuman specie. This scale was done with an acetic acid constriction test and measures five facial features, adapted from human facial pain expression studies, and scores them with a value where “0” there is no pain present, “1” it is moderately visible and “2” is severe. Finally, each mouse…

nature. Being a furred mammal, it has hair all over at different lengths and fibers to aid in keeping a sustainable environment (Dry 1926). Most of the adaptive thermoregulation in a mouse takes place in brown adipose tissue (Gray et al. 2002). This rodent is an endotherm. Endotherms are known for maintaining a constant, within narrow range, internal environment, unrelatedly to their external environment. That is opposite of an ectotherm which changes its internal environment temperature to…

procedures in the name of medicine. According to Animal Testing,“researchers subject rodents to burns, electric shocks, or other painful experiences in order to examine how similar traumas could affects humans. Other animals are intentionally given diseases so that scientists can test and devise effective treatments.” Scientists subject defenseless animals through experiences that are in humane such as burns and shocks. The rodents subjected to these inhumane practices suffered from third-degree…

North America. They live in forests, mountainous areas, and even semi- deserts and brush land. They can eat anything from rodents to adult dear and use camouflage to capture prey. Differences The bobcat is the most common wildcat in North America. They live in forests, mountainous areas, and even semi- deserts and brush land. They can eat anything from rodents to adult dear and use camouflage to capture prey. Leopards and tigers have a type of camouflage to blend in with the…

a decrease of skin temperature, indicative of sympathetic arousal, when they viewed videos of conspecifics injected with needles or videos of the needles themselves [33]. However, it has to be pointed out that, on the contrary to what happens in rodents, in primates facial expressions have a crucial role in comunication within groups [34]. Therfore, the emotional…

Scientific name: Acrocephalus Aequinoctialis This is an endangered species. Ecological role: Maintains prey/predator population. Helps maintain the spread of a species of weed by dispersing certain seeds as well as feasting on the plant. In danger due to threat from predatorial rat (rattus spp.) and cat species (Felis catus), hunting by children and adults on the island, loss of trees (trumpet tree) that provide food and habitat loss due to sudden and ill-planned immigration. Proposed…