Cell Wall: The Cell Wall is composed mainly of Cellulose whose molecules are joined together in fibrils as layers and contains openings to make it permeable. Most Cell Walls also contain lignins, which add rigidity, and waxes, such as cutin and suberin, which reduce water loss from cells. Its main function is to protect the cellular contents, and provide structural support to the plant. It is also involved in transport, absorption, and secretion during a plant's life cycle.
Vacuole: Vacuoles are cavities filled with cell sap and bounded by a membrane. The cell sap is made up of water containing various dissolved sugars, salts, and other chemicals. Its…...
Photosynthesis 1231
Plant Cell and Solar Cell: Similarities and Differences
Photosynthesis is that process by which plants harness the solar energy for producing food. These cells help the plants to trap energy from the daylight. This trapped light is converted into other constituents that are then used by the plant to manufacture food. The additional components such as oxygen are released to the atmosphere. After these processes, the light energy is converted to chemical energy. The modern science has been able to develop technologies containing semiconductors that have solar cells. The solar energy is trapped and is converted to electricity by these solar cells (Haile & O'Connell, 2005).
The semiconductors and photosynthesis have some similarities and dissimilarities. As far as the similarities are concerned, their aim is to harness the solar energy. While plants use photosynthesis to lock in energy from the sun for manufacturing food, semiconductors trap solar energy to convert it…...
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References
DOE/National Renewable Energy Laboratory (2011, May 12). Improving photosynthesis? Solar cells beat plants at harvesting sun's energy, for now. ScienceDaily. Retrieved July 27, 2012, from http://www.sciencedaily.com/releases/2011/05/110512151408.htm
Meiosis, Transpiration, Monocots, Dicots, Plant Cell, Angiosperms, Fungi, Algae
The Events of Meiosis and the Importance of Prophase 1
Generally, meiosis has two divisions of events. Each constitutes 4 phases of same names but of different division number. They are prophase, metaphase, anaphase, and telophase. From Meiosis of Access Excellence, the events in meiosis can be summarized as the following.
Prophase 1 - chromosomes duplicate into a pair of chromatid. Later, exchanging of fragments or crossing-over may occur.
Metaphase 1 - aligning of chromosome pairs at the center of the cell.
Anaphase 1 - separation of homologous pairs to opposite poles of the cell.
Telophase 1 - homologous pairs separate and forms two daughter cells
Prophase 2 - no replication of DNA
Metaphase 2 - aligning of chromosomes at the center of each cell
Anaphase 2 - the chromatids separate moving to opposite cell direction
Telophase 2-4 cells are formed each containing one chromosome.
he RHDl gene product appears to be necessary for proper initiation of root hairs, whereas the RHDS, RHD3, and RHD4 gene products are required for normal hair elongation. hese results demonstrate that root hair development in Arabidopsis is amenable to genetic dissection and should prove to be a useful model system to study the molecular mechanisms governing cell differentiation in plants.(Schiefelbein & Somerville, 1990, p.235)
he genetic analysis of root hair development has identified several genes that are required for the initiation and growth of the root hair. RHL1, RHL2, and RHL3 genes are active during the formation of a bulge early in root hair growth. RHL1 encodes a nuclear protein of unknown function that is required for the formation of the polarized outgrowth. RHD6 activity is necessary to localize the site of hair initiation in the trichoblast. RHD6 acts through an auxin/ethylene pathway, as the rhd6 mutant phenotype can…...
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There were twice as many short hairs (fewer than 40 um long) as it found in 2002. In 2002 the plants were grown in Hoagland's medium (which contains 3 X more sucrose). This was solidified with Bactoagar, and was probably grown in different lighting conditions. I will use both methods (2007 & 2002) to test this hypothesis by growing plants in AMM medium compared to Hoagland's medium with bactoagar.
Can the rhd7-4 ttg double mutants be used for experiments to increase the number of ruptured and recovering root hairs? The ttg mutation causes every epidermal cell to produce a root hair. I am growing rhd7-4 and ttg to cross them in order to obtain the double mutant rhd7-4 ttg and collect seeds. The hypothesis is the double mutant rhd7-4 ttg produced will increase the number of hairs per root for experimental use (since only 40% recover in rhd7-4{10}). (Galway et al., 1994, p.741) How normal are the mutant plants? Does spontaneous root hair rupture (from inside to outside) cause healthy, sterile rhd7-4 or kjk-2 plants to respond as if they are under attack by a plant pathogen (from the outside to the inside)? Methods: PR1 is "Pathogenesis Related Gene 1." PR1 gene is expressed (= mRNA is transcribed, and proteins are synthesized using the mRNA) when plants are attacked by pathogens. The actual function of the protein encoded by PR1 is unknown. To test if rhd7 plants respond to rupture as if they are under attack, we will use plants that contain an extra copy of the PR1 gene combined with a GUS gene. The GUS gene is not a plant gene, it a prokaryotic (bacterial) gene that encodes a ?-glucuronidase enzyme. The purpose of the artificial GUS: PR1 gene is that if the plant is "under attack" normal PR1 genes plus the GUS: PR1 is activated. The plant therefore starts synthesizing ?-glucuronidase enzyme. If we kill the plant and wash it in a solution of the colorless X-Gal substrate, the ?-glucuronidase binds to the X-Gal and catalyzes its chemical conversion into a bright blue dye. Therefore, if a GUS: PR1 containing plant has produces no blue dye, it is not under attack and did not make ?-glucuronidase. However, if the plant turns blue, we know that it made ?-glucuronidase and is reacting as if it was under attack. GUS is called a "reporter" gene because it tells the researcher if the gene of interest (PR1) is activated or not.
Method will cross plants containing GUS: PR1 to rhd7 and kjk in order to obtain rhd7 GUS: PR1 plants and WT (rhd7) GUS: PR1. Then I will carry out the GUS staining test on these plants, and compare wild type to rhd7.
Operation Management
What type of layout would you use for the assembly of a television set? What are the reasons for this choice?
A product layout would be best suited for the assembly of a television set. Televisions sets, in general, are commodity products with very little differentiation between product classes. In many instances a Sony 32-inch high definition television will have many of the same components as the Sony 40-inch high definition television set. Conversely, auto manufacturers often use the same parts on similar vehicle types.
In regards to a television set, companies often mass produce these items to achieve economies of scale. Manufactures, such as those that create televisions, often have very high fixed costs associated with property, plant, and equipment. As such, the more television that are produced the cheaper on a per unit basis each television is. The manufacturer therefore has incentive to product a wide array of televisions…...
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References:
1) Hyer, Nancy and Wemmerlov, Urban. (2002). Reorganizing the Factory: Competing through Cellular Manufacturing, Portland, OR
2) Ohno, Taiichi (1988). Toyota Production System. Productivity Press. p. 8. ISBN 0-915299-14-3
3) Swamdimass, Paul M. And Darlow, Neil R. (2000). 'Manufacturing Strategy', in Paul M. Swamidass (ed.), Innovations in competitive manufacturing, Boston, Mass.; London: Kluwer Academic, 17-24
U.S Department of Energy (2010) provides the description of different fuel cell technologies. The fuel cell technologies are differentiated according to their efficiency, operating temperatures, costs and application. The classifications are based on 6 major groups:
Alkaline fuel cell (AFC),
Phosphoric acid fuel cell (PAFC),
Solid oxide fuel cell (SOFC),
Molten carbonate fuel cell (MCFC),
Proton exchange membrane fuel cell (PEMFC);
Direct methanol fuel cell (DMFC).
Alkaline fuel cell (AFC)
The AFC generates electrical power using alkaline electrolyte KOH (potassium hydroxide) in water-based solution. The presence of hydroxyl ions within the electrolyte allows a circuit to extract electric energy. The illustration in Fig 2 reveals an alkaline fuel cell. As being revealed in Fig 2, two hydrogen gas molecules combines with 4 hydroxyl ions have a negative charge to release 4 electrons and 4 water molecules. The equation 4 reveals the reaction of oxidation that takes place. (Mark, 2003).
Equation (4)
(Oxidation) 2H2 + 4OH H2O +…...
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References
Andujar, J.M, Segura F. (2009). Fuel cells: history and updating. A walk along two centuries.
Renew Sustain Energy Rev. 13:2309 -- 22.
Grove, W.R. (1842). On a Gaseous Voltaic Battery. Philosophical Magazine and Journal of Science .vol. XXI: 417 -- 420.
Kordesch, K.(1999). Alkaline fuel cells applications, innovative energy technology. Austria: Institute of High Voltage Engineering, U Graz.
On average, male skeletons are larger than female skeletons, but just as some women are larger than some males, this distinction does not hold firm in all instances. Female pelvic regions tend to be wider than male pelvic regions, an evolutionary feature that has made childbirth easier. Female bones tend to be thinner and less dense than male bones, and thus the female skeleton tends to be lighter than male skeletons.
The skull is one of the most notable sites of difference between male and female skeletons. The teeth of males tend to be larger, and above their eye sockets men tend to have a more visible brow ridge while women often have none. The male skull tends to have a squarer (as opposed to a pointed) chin and is more angular in its demarcations than the female skull. Women's nose openings are more apt to be pointed, rather than…...
Family Background Plant, Breeding History Plan
isconsin fast plants were developed in the mid-1980's by professor Paul illiams as a way of enabling individuals to study the life cycle of plants in a relatively short period of time. isconsin fast plants are of the brassica rapa species, and are ideal for short-term studies because they develop celeritously over a life cycle which is completed within a year's time. They typically bloom in the winter. Although there are many different varieties of brassica rapa (which includes strains such as brassica rapa ssp. campestris L., brassica rapa ssp. sarson and others) (Itis), they are all part of the family known as cruciferae. These plants look like many types of vegetables including mustards, turnips and cabbage. Virtually all of the plants in this family have four petals that cross one another similar to a crucifix, which is where the name of this family…...
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Works Cited
Marstaller, Tess, Hanmer, Tasia, Lang, Caitlin. "Assessing Fast Plant Growth in Different pH Levels." 2003. Web. http://community.emmawillard.org/Math/mathscienceweb/Fast%20plant%20growth%20in%20different%20pH%20levels_files/Fast%20plant%20growth%20in%20different%20pH%20levels.htm http://communityemmawillard.org.
The price charged for the company's biodiesel product lines will be tied to the prevailing prices charged for feed stock and production costs, but any costs in excess of traditional diesel fuel alternatives will be offset by marketing initiatives designed to promote the environmentally responsible aspects of the products' use, as well as the patriotic aspects of reducing America's reliance on foreign oil.
Distribution (Place). Transportation for the company's product line will be outsourced.
Promotion. As noted above, biodiesel products possess a number of characteristics that can be promoted to different industries and organizations depending on their specific needs. Larger enterprises such as Universal Studios Theme Park could be encouraged to use biodiesel alternatives based on the tax advantages and public relations opportunities such use affords; likewise, governmental agencies could reap economies of scale by converting large vehicle fleets to biodiesel applications and also enjoy the P benefits that accrue to…...
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References
Cravens, D.W. (2000). Strategic marketing (6th ed.). New York: McGraw-Hill.
Edinger, R. & Kaul, S. (2003). Sustainable mobility: Renewable energies for powering fuel cell vehicles. Westport, CT: Praeger.
Cell division in plants is a process that is currently under intense study by biologists. One team of researchers in Australia has recently published a paper describing their research into the role that microtubules play in cell division and morphogenesis. While these structures have been identified to be involved in cell division and growth, how they form, disassemble, and reappear is not fully understood. The Australian team's research consisted of their testing the hypothesis that a gene in the plant A. thaliana, called mor 1, plays a role in the development of microtubules.
In order to test this hypothesis, the team determined that the mor1 locus in a mutant A. thaliana caused temperature sensitive mutations in the development of microtubules when the temperature was increased from 21?C to 29?C. They used immunofluorescence microscopy, a technique that stains cell structures with a fluorescent dye, to visualize the actual microtubules of both…...
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References
Whittington, Angela, et al.. "MOR1 is Essential for Organizing Cortical Microtubules
in Plants." (31 May, 2001). Nature 411, 610-613. Retrieved from www.nature.com
With our progressing knowledge in molecular biology and the increasing understanding of the various signaling pathways there is no question of doubt that in the near future the prognosis for OSCC would be considerably improved. As with any other disease, prevention is better than cure. Avoiding the well-known risk factors, a well-balanced nutritional plan and regular dental health checkups are the most effective means of preventing Oral cancers.
ibliography
1) Michael King, Kourt Chatelain & Dustin Farris et.al, 'Oral Squamous Cell Carcinoma proliferative Phenotype is modulated by Proanthocyanidins: a potential prevention and treatment alternative for Oral Cancer', MC Complementary and Alternative Medicine, 2007, 7:22, 19 June 2007 http://www.biomedcentral.com/1472-6882/7/22
2) M. Chidzonga, L. Mahomva, 'Squamous cell carcinoma of the oral cavity, maxillary antrum and lip in a Zimbabwean population: A descriptive epidemiological study, Oral Oncology, 2006, Volume 42, Issue 2, Pages 184-189
3) National Cancer Institute, 'Oral Cavity', Accessed Jan 15th 2010, available online…...
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Bibliography
1) Michael King, Kourt Chatelain & Dustin Farris et.al, 'Oral Squamous Cell Carcinoma proliferative Phenotype is modulated by Proanthocyanidins: a potential prevention and treatment alternative for Oral Cancer', BMC Complementary and Alternative Medicine, 2007, 7:22, 19 June 2007 http://www.biomedcentral.com/1472-6882/7/22
2) M. Chidzonga, L. Mahomva, 'Squamous cell carcinoma of the oral cavity, maxillary antrum and lip in a Zimbabwean population: A descriptive epidemiological study, Oral Oncology, 2006, Volume 42, Issue 2, Pages 184-189
Fuel Cell Technology
There are over 600 million motor vehicles in the world today. If present trends continue, the number of cars on Earth will double in the next 30 years." ("Cars Emit")
As the demand for energy increase and resources, such as fossil fuel, decrease alternative must be sought. Of these alternatives, hydrogen fuel cell technology, in automotive applications, has significant benefits and is now technologically feasible. Given this knowledge, it is imperative that we begin to set up the infrastructure necessary to utilize this technology.
I have studied this topic over the last three years, and the advancement of the technology has become increasingly exciting. hat was once a dream is now a reality.
I'm going to provide you first with an overview of how fuel cells work and then describe for you the benefits of the use of fuel cells, including why hydrogen is the best choice. And, in the…...
Based on the results of these assays, S. flexneri can often be identified, although additional kits may be required. The simplest way, however, may be the novel approach through multiplex PCR (mRPC). It is possible to identify Shigella species through mPCR techniques by identifying pathogenicity islands associated with Shigella and S. flexneri.
6. How could you create a corn plant that would express the human protein fibrin? (You need to include techniques, steps, enzymes, etc.)
In order to create a corn plant that would express the human protein fibrin, scientists would first need to incorporate the human fibrin gene within the corn plant genome. The incorporated human gene would require regulation and promoter sequences that would function within the plant cell. Proper splicing sequences would also be required or removal of the introns altogether.
The delivery of transgenes into the corn plant could be accomplished through electroporation into corn protoplasts followed by…...
PCR GAPDH Genes Parsley
PCR Analysis of GAPDH Genes in Parsley
The purpose of this review is to consider the structure and the function of the protein glyceraldehyde-3-phosphate dehydrogenase (GAPDH, EC 1.2.1.12) in Petroselinum crispum and Coriandrum sativum cells. For over three decades, GAPDH was studied for its pivotal role in glycolysis. As an abundant cell protein, it proved useful as a model for investigations examining basic mechanisms of enzyme action as well as the relationship between amino acid sequence and protein structure. Further, with the advent of molecular technology, GAPDH, as a putative 'house-keeping' gene, provided a model with which to use new methods for gene analysis to advance our understanding of the mechanisms through which cells organize and express their genetic information.
As with many things in life, what is thought to be simple and relatively straight-forward turns out to be quite complex and elaborate. In this regard, a number of…...
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Works Cited
Kim, E. And Archibald, J. (2009) Diversity and Evolution of Plastids and Their Genomes. Plant Cell Monograph. 1-39.
Lopez-Juez, E. 2007. Plastid biogenesis, between light and shadows. J. Exper. Bot. 58: 11 -- 26.
Martin, W., Rujan, T., Richly, E., Hansen, A., Cornelsen, S., Lins, T., Leister, D., Stoebe, B., Hasegawa, M, & Penny, D. 2002. Evolutionary analysis of Arabidopsis, cyanobacterial, and chloroplast genomes reveals plastic phylogeny and thousands of cyanobacterial genes in the nucleus. PNAS 99: 12246 -- 12251.
Plaxton, W.C. 1996. The organization and regulation of plant glycolysis. Annu. Rev. PlantPhysiol. Plant Mol. Biol. 47: 185 -- 214.
These proteins include homologous members of yeast. The presences of these proteins suggest that E. histolytica is skilled to perform homologous recombination, which is the same as in other organisms. DNA damage was evaluated by TUNEL assay. In yeast and in human cells, histone H2AX becomes rapidly phosphorylated when DSs are introduced into chromatin (Lavi et al.).
Studies show that histone as a protein plays a significant role in the transition between the expression of a fetal gene and that of the adult gene. The adult gene's metabolism becomes oxidative in order to adapt to air and to weight, as it generates methylated transmitters and creatine phosphate. The muscles get used to life on the ground as compared to the fetal life which takes place in an aquatic environment. Regulated proteins allow the muscles to respond in a more adequate manner to this environment.
Now, let us see how histone and…...
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Bibliography
Abraham, R.T. (2001). "Cell cycle checkpoint signaling through the ATM and ATR kinases." Genes Dev 15(17): 2177-96.
Alexiadis, V., T. Waldmann, J. Andersen, M. Mann, R. Knippers and C. CGruss (2000). "The protein encoded by the proto-oncogene DEK changes the topology of chromatin and reduces the efficiency of DNA replication in a chromatin-specific manner." Genes Dev 14(11): 1308-12.
Aten, R. And H. Behrman (1989). Antigonadotropic effects of bovine ovarian gonadotropin-releasing hormone-binding inhibitor from bovine ovaries. Purification and identification of histone H2A. J. Biol. Chem. 264: 11065-11071.
Antigonadotropic effects of bovine ovarian gonadotropin-releasing hormone-binding inhibitor/histone H2A in rat luteal and granulosal cells. J. Biol. Chem. 264: 11072-11075.
Cellular respiration is the process by which cells break down glucose to produce ATP (energy).
In animal cells, cellular respiration occurs in the mitochondria, where glucose is broken down through a series of metabolic reactions to produce ATP. The final products of cellular respiration in animal cells are carbon dioxide and water.
In plant cells, cellular respiration also occurs in the mitochondria, but plants have an additional organelle called chloroplasts that allow them to perform photosynthesis. During photosynthesis, plants convert sunlight, water, and carbon dioxide into glucose and oxygen. The glucose produced through photosynthesis is then used in cellular respiration to....
Cellular Respiration: A Fundamental Metabolic Process
Cellular respiration is a ubiquitous metabolic pathway that generates energy for cells through the oxidation of organic molecules. It plays a critical role in sustaining the vital functions of all living organisms. While the overall process of cellular respiration remains largely conserved across different cell types, animal and plant cells exhibit distinct adaptations in their respiratory mechanisms, reflecting their unique physiological characteristics and metabolic requirements.
Substrate Utilization: The Fuel for Cellular Respiration
The primary substrates for cellular respiration are glucose, a carbohydrate, and fatty acids. In animal cells, glucose is broken down through glycolysis, a series of....
1. Plant Chemical Defenses and their Prominence in Medical Treatments
Plants have evolved intricate strategies to defend themselves against herbivores, pathogens, and environmental stressors. These defense mechanisms include the production of a diverse array of chemical compounds. Plant chemical defenses play a crucial role in protecting plants from damage and ensuring their survival. However, the medicinal properties of these compounds have been recognized for centuries, with traditional medicine systems utilizing plants as sources of healing remedies. Modern medicine has also begun to harness the therapeutic potential of plant chemical defenses, leading to the development of novel drugs and therapies.....
Water contamination poses significant threats to the survival and health of plants and animals in ecosystems. Here's an elaborate explanation:
Effects on Plants:
Reduced Growth and Yield: Water contaminants can inhibit the absorption of nutrients and water, leading to stunted growth and decreased crop yield. Heavy metals like lead and mercury can accumulate in plant tissues, impairing photosynthesis and nutrient uptake. Physiological Damage: Some contaminants, such as pesticides and fertilizers, can cause physiological damage to plant cells, resulting in wilting, yellowing, and leaf drop. Reduced Seed Germination: Contamination can affect seed germination by altering the hormonal....
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