Summary House-flies are known to carry easily transmitted diseases. Home owners have many options to keep flies out of their homes but many are unsustainable such as insecticides or fly paper. Fly screens have been identified as the best solution to keep flies out of the home because they have a small local environmental footprint and are also cheap to manufacture. Researchers in 1964 at the London School of Hygiene and Tropical Medicine ran experiments to conclude that mesh of 2.17 ± 0.09 mm should be selected over mesh of 1.16 ± 0.05 mm as it not only keeps out flies but also has less ventilation and light obstruction of around 20% rather than 36%. Introduction The aim of this report is to use the engineering process …show more content…
An initial test to see what size mesh flies cannot fit through would have to be conducted. In 1964 a test on what mesh to use was completed by J. R. Busvine at the London School of Hygiene and Tropical Medicine (3)¬. The experiment undertaken to determine the necessary dimension of holes needed to block house-flies included a piece of gauze (of prespecified size) secured between two jars. It was important to keep the ratio of male to female flies even as male flies are often smaller than females (as shown in Table 1) and in a real-world situation it would be beneficial to prevent against both male and female flies. In each test, after a period of 5 hours the flies which had escaped into the second jar were killed, counted and sexed. It was then concluded that (shown in Figure 1) the largest aperture that the flies could not pass through is 2.17 ± 0.09 mm. Compared to the 1.16 ± 0.05 mm mesh, the 2.17 ± 0.09 mm was found to only block 20% of incoming light instead of 36%. Regarding obstruction to ventilation is was found to be roughly proportional to the percentage of obstruction to the light
Variation in selection pressures on the goldenrod gall fly and the competitive interactions of its natural enemies
If you are concerned about safety, then consider the low height and transparent mesh side windows. The windows help ensure ventilation and airflow.
Ramona the pest by Beverly Cleary is a silly, exciting and fun book to read. Ramona is excited about the first day of kindergarten. But when she gets there it isn’t what she thought it would be like. Ramona is distracted about another classmate’s hair and can’t wait any longer to touch her hair. Ramona gets in trouble a few times but then gets over it. Her sister Beezus (Beatrice) thinks that she is a pest and everybody in her neighborhood thinks she’s a pest. At first when she starts kindergarten she loves her teacher but when Ramona gets in trouble a few times she’s beginning to thinks her teacher doesn’t like her anymore.
We have cumulated a profit of $206 million over this period, second of the industry. Our goal of escalating profit has advised us to increase automation level and for cutting costs, which enabled us to have the margins of all products above 30% in 2019 and an average margin of 53.4% in 2024. Additionally, we invested to keep our products updated to the market trend with an attention to customer buying criteria. Moreover, starting from recent years, we run our full capacity with second shifts whenever the market need has a possibility to accommodate our production. To achieve a greater profit, we based our pricing strategy on the market movements in general by decreasing our price by $0.50 every year except for our Low End product-Acre.
Both some of the original flies and some offspring died during the experiment which could have influenced the results. If a vestigial fly died before it could mate that would give the wild type males an advantage in mating and producing a greater number of offspring. This would also be the case if any flies were harmed at any time during the mating period. To try and combat this problem the next time this experiment is done a larger number of male fruit flies could be used or more samples taken to try and reduce extremes in the data. Studying fruit fly mating behavior is very important because their generation length is so short and reproduction happens rapidly.
Schwalbe, F. H. (1953). Of Bugs and Bombs. Retrieved 05 21, 2014, from University of Missouri, St Louis: http://www.umsl.edu/~thomaskp/schwab.htm
For the second experiment, the reproduction of fruit fly was manipulated by placing different levels of ethanol into the test tubes in which adult males and females were inserted. First, 2 adult males and 3 adult females were placed inside test tubes for two weeks. These test tubes contained different levels of ethanol in order to determine how many adult flies would hatch depending on the concentration of ethanol in the environment. There were a total of ten groups containing different amounts of ethanol. The five groups of two contained 0%, 1%, 2%, 4%, or 8% ethanol. After the two weeks, hatched adult flies were anesthetized with Fly Nap in order to remove them from the test tube to calculate how many were produced in the different levels of ethanol. They were then counted to determine which level of ethanol concentration best allowed the fruit fly to hatch. After the counting of the flies the adult flies were disposed of into a jar of
In this experiment we set out to determine whether or not two different fruit fly crosses fit the 9:3:3:1 ratio, which is set up by the law of independent assortment. We did this by setting up a flask with first generation flies that gave rise to a second generation, which could be used to observe inheritance of phenotypes based on the parental phenotypes. We put the flies under a dissecting microscope to determine which phenotypes they exhibited, recorded the phenotypes in a table, used the data to determine the chi squared value, and compared our chi squared value to that of a table to determine if it actually fit the expected ratio. We found that in one cross this was true and that the other cross shouldn’t have fit it because it didn’t
Traits of both male and female flies were separated, observed and identified. The process is the same for the other experiments except for the dihybrid cross test where the F1 generation mates to create the F2 generation for further observation. The uncontrolled portion of the experiments were the flies with specific traits chosen for each
Drama plays usually keep an audience on the edge of their seats. But what happens when you bring one white character into a home of only african americans? It might raise some issues. Lydia R. Diamond developed this plot line when she wrote the drama Stick Fly. It was performed by a brilliant cast of college students at Saginaw Valley State University. The show has a good message behind it, emphasizing the importance of family and love.
Flies are about at all times and it is hard to concentrate. Also, some of
The objective of this experiment is to determine what genes are responsible for the white-eye color in two strains of Drosophila melanogaster, known as the common fruit fly. Drosophila is used as the experimental organism for many reasons which include its small size, easy maintenance, short 10 day generation time, and a fully sequenced genome. The characteristics of the wild type, which is the most common phenotype found in nature, include brick red eyes, long wings, gray/tan body, and smooth bristles. Of course, there are mutations that occur that cause specific traits to deviate from the wild-type phenotype. These traits include wing length, bristle shape, body color, and eye color.
“A segment is a set of buyers who share common needs or characteristics”(Marketing by Tony Gray (2000))
From here, we can see the differences in the target markets of 7-Eleven and the competitors. As mentioned above, 7-Eleven is focused on meeting the needs of convenience-oriented.
The purpose of this report is showing how to apply the control process in the