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Leptin

 

            DaBrAt37Colorado Potato Beetle, medium-sized beetle, member of the leaf beetle family, serious threat to potato crops. Colorado potato beetles are native to the eastern Rocky Mountain region of the United States. Before potatoes were widely cultivated in North America, these beetles fed on food plants belonging to the nightshade family. When potatoes began to be cultivated in the United States in the mid-19th century, the beetles were provided a vast new food supply, since the potato plant is a member of the nightshade family. The Colorado potato beetle rapidly infested the potato-growing regions of North America. It was accidentally introduced into Europe in 1922, but its spread has been slowed by rigorous extermination efforts.
             Both larvae and adult beetles feed on potato foliage, though they sometimes also consume vegetables and flowering plants. The Colorado potato beetle typically lays bright yellow eggs in clusters on the underside of leaves. Several generations of the insect can reproduce in a single year. .
             Scientific classification: The Colorado potato beetle is a member of the family Chrysomelidae. It is classified as Leptinotarsa decemlineata.
            


Essays Related to Leptin

1. Leptin

... anorexigenic signal producing neurons overlap and are connected strongly supports the localisation of the appetite-regulating centre in the hypothalamus. As such, how might leptin be considered an appetite suppressant? It must be demonstrated that it acts upon the neurons in the hypothalamus that are considered to be part ... augmentation of anorexigenic signals (?MSH, CART and GLP-1), as seen by the fact that lesions of the VMN lead to both hyperphagia and leptin resistance. While the VMN-DMN-PVN connection is thought to integrate the timing of appetite mechanism, seen by the loss of re...

  • Word Count: 3450
  • Approx Pages: 14
  • Grade Level: Undergraduate

2. Leptin

... fat. It is derived from the Greek word, leptos, meaning thin. In general, the greater the body mass is and percent of fat, the higher the levels of leptin. It is believed that leptin acts as an indication of how much fat is really in the body to the brain's hypothalamus, which harmonizes the essential functions of the body such as eating ... then it would be released into the bloodstream. Researchers published a study documenting that there was a thirty percent weight loss in genetically obese mice that were given daily injections of leptin for two weeks. While receiving leptin, the mic...

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3. Leptin and Obesity: Is There Really a Connection?

... do with obesity, with the exception of a few rare cases? There have been some significant changes in the bodies of the children who were given leptin, but not having to do with weight loss. The children had a drop in LDL cholesterol (bad cholesterol) to an increase in HDL cholesterol (good ... cholesterol). During the studies, the children also experienced a strengthening in the immune system. This may make it possible to use leptin in the fight against HIV and AIDS. A study conducted by Jeffrey Friedman, M.D., Ph.D. had some interesting results as well. His studies showed that some ......

  • Word Count: 644
  • Approx Pages: 3
  • Grade Level: High School

4. Obesity

... (Causes, 2003). In her book, The Hungry Gene, Ellen Shell promoted the idea that leptin may be one of the causes of obesity (Causes, 2003). Leptin is a naturally occurring hormone that controls the appetitie. When full, fat cells release the hormone leptin, it curbs the appetite (Causes, 2003). If leptin production is changed, the fat cells are unable to signal that they are full ... and weight gain occurs. Research into leptin is just beginning (Causes, 2003). A small minority of cases of obesity can be explained by gland or hormonal problems. One such problem is clinical hypothyroidis...

  • Word Count: 1746
  • Approx Pages: 7
  • Grade Level: High School

5. Obesity

... overweight or obese (Fisher 23). In at least one case, scientists have overestimated the genetic factor of obesity. Leptin, a naturally occurring hormone, which controls the appetite, is a very important genetic factor of obesity. When full, fat cells release appetite curbing hormone, leptin. If leptin production is hindered, the fat cells are unable to signal that they are full and weight gain occurs (Shell ... 100). Though scientists discovered leptin in the 1990s, as of August 2001, only a few individuals have had abnormalities related to ... leptin. Though this is a counterexample ...

  • Word Count: 1551
  • Approx Pages: 6
  • Has Bibliography
  • Grade Level: Undergraduate

6. The Importance of Napping

... apnea and insomnia). Sleep is also needed to regulate hormones related to weight gain. Without the proper amount of sleep, our bodies drive leptin levels down. Leptin and ghrelin are hormones that work together. Ghrelin stimulates appetite and causes leptin to force a signal to the brain, letting the body know when it the appetite is satisfied. For people who don't consistently get eight ... hours of sleep, leptin levels are lower and can lead to overeating. With the lack of sleep, the ghrelin levels rise and cause an increase in hunger. A nap would help balance the two hormones ... ...

  • Word Count: 809
  • Approx Pages: 3
  • Has Bibliography
  • Grade Level: High School

7. The Science of Obesity

... stores and the pressures of weight-based discrimination in society. One of the most successful discoveries of curing obesity is leptin, which is the hormone that regulates body weight. This hormone was first discovered at the Jackson Laboratory in 1950, "Leptin, which is made by the body's fat cells, is the linchpin in a complex endocrine system that not only maintains the ... body's weight in a narrow range, but also exerts powerful effects on other aspects of physiology related to an organism's nutritional state" (Rockefeller University, n.d.) Leptin, due to the fat cells, is produced...

  • Word Count: 748
  • Approx Pages: 3
  • Has Bibliography
  • Grade Level: High School

8. The Concept of Motivation

... with their fat cells and hormones to create this weight range. Fat cells secrete a protein called leptin which is caused by a gene called obese; ob for short. When peoples leptin levels are normal they eat just enough to maintain their weight. Despite this scientific discovery, increasing a person's leptin levels does not help them lose weight. Scientists have a health debate over being overweight. Some ... ...

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  • Grade Level: High School

9. Conditions and Treatments of Sleep Deprivation

... function and having slower reaction time. Another common effect that comes with no sleep is weight gain it is common with sleep disorders because "without sleep the eating hormones leptin and gherlin are produced less. Leptin is the hormone that affects your fullness after a meal and gherlin is the hormone that affects your appetite. When you are sleep deprived ... leptin falls and gherlin increases" (N.P., n.d). When this happens it causes you gain weight because your body is trying to get energy from as many places as possible even if that ... ...

  • Word Count: 3149
  • Approx Pages: 13
  • Has Bibliography
  • Grade Level: High School

10. Endocrine Organs

... infected body cells. Hormones stimulate differentiation and development of T cells. These in turn stimulate other immune cells such as leukocytes. b. Adipose tissue and leptin: leptin is synthesized and released from cells in proportion to the amount of fat in tissue. Leptin acts on the hypothalamus causing a reduction in hunger, and stimulates the thyroid for increased metabolism. c. Heart and atrial natriuretic factor: the heart ... ...

  • Word Count: 409
  • Approx Pages: 2
  • Grade Level: Undergraduate