«One of the most fascinating systems of a cell or an organism is the way it deals with water. Every living needs water to survive and manages the intake of this precious resource differently. Water diffuses through a selectively permeable membrane...» Document abstract
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Language : english
biology
presentation
date published
17/09/2007
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SummaryOne of the most fascinating systems of a cell or an organism is the way it deals with water. Every living needs water to survive and manages the intake of this precious resource differently. Water diffuses through a selectively permeable membrane within a cell by the process of osmosis (Campbell, 145). Osmosis ensures that a cell’s environment is healthy by regulating the solute and solvent concentration. A solute is a substance dissolved into another substance and a solvent is a substance into which something is dissolved, forming a solution. Water is the most functional and well known solvent and affects the state of a cell body.
Table of Contents- Introduction
- One of the most fascinating systems of a cell or an organism is the way it deals with water
- All of this ties into how organisms themselves regulate two of their essential components, salt and water
- In our experiment we used Mercenaria mercenria, also known as hard clams, as our osmoregulators.
- I also predicted that the clam, being an osmoregulator would not experience much change in weight across the different salinities.
- Methods
- Results
- As can be seen in Table 1 as well as in Table 2a, in which we are known as group 1, our clam's weights changed by minuscule amounts over the course of an hour.
- When looking at the whole class as a whole, Graph 2 very vividly shows how the worms were not able to stabilize their salinity levels and changed by a much steeper margin than the clams
- Discussion
- If the environmental conditions around the worms had occurred with salt concentrations much lower than those used in the lab, they would have died due as their cells would burst from all the excess water
- Since the worm data was given to us instead of us finding it out ourselves, there was no way to know if we would have been able to duplicate the same results.
«The experiment that was performed these past few weeks involved measuring the relative growth of a soybean plant that was planted based on how much allelopathic agent we used. Allelopathic interactions are very widespread in nature, and they are...» Document abstract
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3 word format
Language : english
biology
presentation
date published
17/09/2007
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SummaryThe experiment that was performed these past few weeks involved measuring the relative growth of a soybean plant that was planted based on how much allelopathic agent we used. Allelopathic interactions are very widespread in nature, and they are important factors in the mechanisms of the ecosystem. It generally involves the inhibition of growth of certain plant types. It is also used by humans in order to manipulate the growth of weeds and other plants. The plant that was used in the experiment was the Soybean plant. This fast-growing plant is known to be used in the food industry rather extensively.
Table of Contents- Introduction
- The allelopathic agent that was used was Black Walnut. More specifically, Black Walnut produces a substance, toxic to some plants, called Juglone.
- The null hypothesis was that the allelopathic agent will have no affect on the growth of the Soybean plant
- Methods
- The experiment was set up by creating the necessary soil mixtures.
- They were each labeled according to whether they were control, and how much of the allelopathic agent was used in the soil mixture
- Results
- Discussion
«This lab was set up in order to demonstrate the diversity and at the same time scarcity of species of plants in a long island forest as an example for a very global issue. The main principles involved were the community structure and dynamics of...» Document abstract
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3 word format
Language : english
biology
case study
date published
17/09/2007
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SummaryThis lab was set up in order to demonstrate the diversity and at the same time scarcity of species of plants in a long island forest as an example for a very global issue. The main principles involved were the community structure and dynamics of ecology. To observe this in the open we sectioned off three different areas, a grassland, forest edge and mid forest. While examining these areas our main goal was to notice which plants species were dominant and which were only to be found on the outskirts of a sectioned off area.
It was fascinating to see the increased diversity of plants and species on the forest edge in contrast to the mid forest. The forest edge was dense with plants struggling to survive while the plants dominant in the mid forest have taken over and pushed back their competitors in turn creating a less dense environment. Plant life is affected by things such as abiotic environmental factors (Miyazaki 27-28), specialist consumers, which are herbivores and pathogens co-existing with a plant in its native area, and interactions with neighboring plants (Calloway 436-437). Today biodiversity is declining at an exceptionally rapid rate, mainly due to habitat destruction, overexploitation, and competition from non-native invasive species (Miyazaki 23).
It was fascinating to see the increased diversity of plants and species on the forest edge in contrast to the mid forest. The forest edge was dense with plants struggling to survive while the plants dominant in the mid forest have taken over and pushed back their competitors in turn creating a less dense environment. Plant life is affected by things such as abiotic environmental factors (Miyazaki 27-28), specialist consumers, which are herbivores and pathogens co-existing with a plant in its native area, and interactions with neighboring plants (Calloway 436-437). Today biodiversity is declining at an exceptionally rapid rate, mainly due to habitat destruction, overexploitation, and competition from non-native invasive species (Miyazaki 23).
Table of Contents- Introduction
- Methods
- Results
- Tables and Graphs
- Discussion
- Organization and Writing Mechanics
- Strengths and Areas for Improvement
«For years, man has been trying to find a single chemical that triggers flowering in plants. Although this single chemical has not been found, several of the Gibberellins show promising results as an active florigen – such as GA5 and GA6 and...» Document abstract
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3 word format
Language : english
biology
summaries
date published
02/08/2007
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level : Advanced
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SummaryFor years, man has been trying to find a single chemical that triggers flowering in plants. Although this single chemical has not been found, several of the Gibberellins show promising results as an active florigen – such as GA5 and GA6 and possibly GA1 and GA4. Results have shown that these GAs seem to travel intact from the leaf to the shoot apex just after a single long day photoperiod. Gibberellins also seem to accumulate in sufficient amounts to trigger flowering. Gibberellins have also been shown to cause petiole elongation. Much research still needs to be done to draw definite conclusions about the role of Gibberellins as a florigen, but much of the evidence looks promising.
Table of Contents- Abstract:
- Introduction:
- Results
- King and Evans describe the advancement in proving that Gibberellins can replace the Long Day (LD) photoperiod in flowering plants
- Certain Gibberellins seem to have a greater effect on flowering than others
- The first visible change in the GAs level in plants is in the leaf soon after a long day photoperiod
- Conclusion:
«Beep… beep… click… click … this just in: A pandemic breakout of unheard of proportions. Is it anthrax? Or clostridia? It could be, but authorities believe the culprit is Bacillus cereus (49133). B. cereus is a cousin strain to both Bacillus...» Document abstract
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Language : english
biology
presentation
date published
02/08/2007
review : not yet assessed
level : Advanced
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SummaryBeep… beep… click… click … this just in: A pandemic breakout of unheard of proportions. Is it anthrax? Or clostridia? It could be, but authorities believe the culprit is Bacillus cereus (49133). B. cereus is a cousin strain to both Bacillus anthracis (anthrax) and Clostridia perfringens (clostridia). B. cereus is a gram-positive spore-forming and toxin-forming bacteria. Found in many starchy foods, like rice, this enterotoxin usually lasts for less than twenty-four hours. Since B. cereus is a spore producing organism, cooking food will not eliminate the threat of infection. Symptoms include abdominal pain, rectal spasm, diarrhea and nausea. Onset of these symptoms may occur 8-16 hrs after ingestion. If you, or someone you know, suffer from these symptoms, contact local health authorities immediately. Beep… beep… beep…
Table of Contents- Introduction:
- Methods and Materials (with results):
- Results and Discussion:
«The Hmong are an ethnic group indigenous to the Southeast Asian peninsula. They typically live in the mountainous regions of Vietnam, Laos and Cambodia. They are rice farmers who are well known for their embroidery and the color of their dress,...» Document abstract
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5 word format
Language : english
biology
presentation
date published
31/07/2007
review : not yet assessed
level : Advanced
requested 2 times
SummaryThe Hmong are an ethnic group indigenous to the Southeast Asian peninsula. They typically live in the mountainous regions of Vietnam, Laos and Cambodia. They are rice farmers who are well known for their embroidery and the color of their dress, which gives its name to the different Hmong clans. During the Silent War in Laos, which was fought between the Communist party, called the PL, in Laos and the US American CIA, the Hmong aided the CIA by fighting on the ground as guerilla fighters. After the Americans lost the war, the Hmong were in danger of being put into re-education camps by the new communist government in Laos. Therefore, during 1975-2004, over 300,000 Lao, or 10% of the population, mostly Hmong, resettled in America (Cummings and Burke 2005: 31). Most of the Hmong immigrants moved to Stockton, California, Seattle, Washington, Lacrosse and Madison, Wisconsin and The Twin Cities, Minnesota, where they formed Hmong communities, usually with extended families living in the same apartment building, if not the same apartment. The Hmong have had some problems finding a balance between keeping Hmong culture and tradition and adjusting to American culture and traditions.
Table of Contents- The Hmong are an ethnic group indigenous to the Southeast Asian peninsula
- Donnelly points out 'the most immediately striking aspect of gender roles in Hmong society, described time and again by researchers, is the apparent hierarchical relation between men and women,?
- Power and Independence
- Childbirth
- Divorce
- Courtship and dating
- Conclusions
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