cells require a layer to separate the inside of the cell from the outside world. Cells have a semi-permiable membrane which controls what can and cannot enter the cell. In animal cells, as well as some others, this membrane is all that separates the cell from its surroundings. Plant cells, and many single-celled organisms such as bacteria have a rigid cell wall beyond the membrane that provides structure. (Buck) Cell membranes act as the cell's gatekeeper, but are not especially rigid or strong. Cell walls can limit the entry of certain types of molecules, but they do not provide the fine-grained traffic control function of the membrane. Cell walls, however are rigid and strong.
Cell membranes are semi-permeable; they only allow certain molecules to enter and exit. Some molecules, such as water can pass through the membrane through osmosis or diffusion. This process does not require any energy to be…...

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Andreas, Lpp. "Cell Biology." WikiBooks. February, 2005.  http://en.wikibooks.org/wiki/Cell_biology 

Buck, Jim. "Cell Wall." Wikipedia. July, 2005.  http://en.wikipedia.org/wiki/Cell_wall 

Wolf, Jfd. "Cell Membrane." Wikipedia. July, 2005.  http://en.wikipedia.org/wiki/Cell_membrane

Cell Division
All living things are complex organisms that are made up of cells. Some are made up of a single cell while others comprise of numerous cells working together. Cells are the basic functional and structural units of living organisms and are known to be the building blocks of life. In humans it is from a group of cells that tissues are made and from tissues that organs are made which enable beings to live.

Cells obtain food and oxygen through their membranes and each membrane has a specific area which can serve contents of only a given volume. Any increase in volume of the cell requires that the area of the membrane increases. Basically, when cells grow the membrane becomes insufficient in aiding the movement of substances in and out and thus to maintain a favourable surface area to volume ratio, cell division must take place. Furthermore, cell division ensures…...

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References

Bolsover, S., E. Shephard, H. White, and J. Hyams. Cell Biology: A Short Course. 3. Wiley-

Blackwell, 2011. 432.

Conger, Krista. "Scientists turn skin cells into neural precursors, bypassing stem-cell stage." Stanford School of Medicine. n. page. Print.

Morgan, David. The Cell Cycle: Principles of Control. New Science Press, 2007.

Only if the cell can take in nourishment and excrete waste can the other components of the cell like the mitochondria engage in their essential tasks. hen a cell can take in nourishment and excrete wastes, this is the surest first sign of independent life
The problem is that the Cell-u-life Corporation wants an artificial cell that can do more than nourish itself. It wants a cell that can take the place of living stem cells and reproduce, and it is not certain of aerogels can do this. Thus another possibility is trying to create lipid-like structures to make cell membranes in the lab from fat cells in the body that do not come from human sources such as embryos but can reproduce like fat cells.

orks Cited

Team receives grant to study artificial cell membranes."(24 Aug 2005). Stanford News:

Press Release. Retrieved 3 Jun 2007 at h ttp://news-service.stanford.edu/news/2005/august24/aerogel-082405.html...

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Works Cited

Team receives grant to study artificial cell membranes."(24 Aug 2005). Stanford News:

Press Release. Retrieved 3 Jun 2007 at h ttp://news-service.stanford.edu/news/2005/august24/aerogel-082405.html

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

3) National Cancer Institute, 'Oral Cavity', Accessed Jan 15th 2010, available online at,  http://oralcancerfoundation.org/dental/pdf/oral_cavity.pdf 

4) Keyvan Nouri, 'Skin Cancer: Oral Cancer', McGraw-Hill Professional, 2007

Cell is important because it is the building block of the body. It is a replicating organism that has proteins and cytoplasm and nucleic acids inside a membrane Alberts (2002). Cells are in everything from humans to plants, though each representation of life has its own particular cells. Cells are very small and impossible to see with a microscopic lens. That is why the cell was not actually noticed until such technology came along in the 17th century. Indeed, the name cell, which means small room in Latin, comes from the discoverer of the cell, who thought they looked like the small rooms that monks in the medieval era used to live in, which were called cells (Karp, 2009). Essentially, all living organisms are made up of cells and if there were no cells there would be no life. So the cell is very important.
What do cells do? That depends…...

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References

Alberts, B. (2002). Molecular Biology of the Cell. UK: Taylor and Francis.

Karp, G. (2009). Cell and Molecular Biology. UK: Wiley and Sons.

Different Fuel Cell Technologies

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.

Intrinsically Photosensitive etinal Ganglion Cell
ecent studies on biological anatomy of the eye discovered an additional photoreceptor within the mammalian eye. The cells discovered mediate the primary non-image visual activities with the vision system. The functioning of these cells aids in various significant processes including the regulation of the papillary reflex activity in response to light, as well as, the circadian photo entrainment. These cells, called the intrinsically photosensitive retinal ganglion cells respond to more than the absolute light. The ipGCs have a unique feature of activity, as they differ from the usual photoreceptor cells of cones and rods. The rods and cones mediate on the vision of images by signaling the contrasts in light after adaptation. Interestingly, the ipGCs also do adapt to light contrast. The cells show sensitivity to flash of light, as is the case with other photoreceptors. The factor of action of the intrinsically photosensitive ganglion cells…...

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References

1. Bellintani-guardia, B., & Ott, M. (2002). Displaced retinal ganglion cells project to the accessory optic system in the chameleon (chamaeleo calyptratus). Experimental Brain Research, 145(1), 56-63. doi: http://dx.doi.org/10.1007/s00221-002-1091-z 

2. Ben Simon, G.,J., Hovda, D.A., Harris, N.G., Gomez-Pinilla, F., & Goldberg, R.A. (2006). Traumatic brain injury induced neuroprotection of retinal ganglion cells to optic nerve crush. Journal of Neurotrauma, 23(7), 1072-82. doi: http://dx.doi.org/10.1089/neu.2006.23.1072 

3. Engelund, A., Fahrenkrug, J., Harrison, A., & Hannibal, J. (2010). Vesicular glutamate transporter 2 (VGLUT2) is co-stored with PACAP in projections from the rat melanopsin-containing retinal ganglion cells. Cell and Tissue Research, 340(2), 243-55. doi: http://dx.doi.org/10.1007/s00441-010-0950-3 

4. Henderson, D., & Miller, R.F. (2003). Evidence for low-voltage-activated (LVA) calcium currents in the dendrites of tiger salamander retinal ganglion cells. Visual Neuroscience, 20(2), 141-52. Retrieved from  http://search.proquest.com/docview/198275379?accountid=458

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…...

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References

The cell cycle & mitosis tutorial. (1997). The Biology Project. University of Arizona. Updated 2004. Retrieved February 10, 2010 at  http://www.biology.arizona.edu/Cell_bio/tutorials/cell_cycle/cells3.html 

Cell division via mitosis. (2010). Ivy Rose UK. Retrieved February 10, 2010 at  http://www.ivy-rose.co.uk/HumanBody/Cells/Cell-Division_Mitosis.php 

Richards, a. (2002). Male and female skeletons. Retrieved February 10, 2010 at http://transwoman.tripod.com/skeleton.htm

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…...

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Works Cited

Cars Emit Carbon Dioxide." 1997. Global Warming Focus on the Future. 27 May 2004. http://globalwarming.enviroweb.org/ishappening/sources/sources_co2_facts3.html.

Efficiency of Fuel Cells." 2004. HowStuffWorks.com. 27 May 2004.  http://science.howstuffworks.com/fuel-cell4.htm .

Gasoline and Battery Power." 2004. HowStuffWorks.com. 27 May 2004.  http://science.howstuffworks.com/fuel-cell5.htm .

Proton Exchange Membrane." 2004. HowStuffWorks.com. 27 May 2004.  http://science.howstuffworks.com/fuel-cell2.htm .

a&P Lab
Design Project -- A&P Lab

Ammonia (NH3) is produced by cells located throughout the body; most of the production occurring in the intestines, liver, and the kidney, where it is used to produce urea. Ammonia is particularly toxic to brain cells, and high levels of blood ammonia can also lead to organ failure. The imaginary organelle referred to as a hydrosome functions in a manner that decreases the blood ammonia levels in people, thereby circumventing the need for medications such as to treatment to prevent hepatic encephalopathy and conditions associated with a failing liver. The hydrosome functions similarly to a primary lysosome, also containing a highly acidic interior with lytic enzymes called hydrolases. However, the waste disposal that the hydrosome conducts serves to convert ammonia to a water-soluble waste that is then excreted by the kidneys.

About this Organelle

I came up with the idea for this organelle because many diseases…...

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Works Cited:

Batshaw ML, MacArthur RB, Tuchman M. Alternative pathway therapy for urea cycle disorders: twenty years later. Journal of Pediatrics. 2001; 138: S46-55.

Haberle J, Boddaert N, Burlina A, Chakrapani A, Dixon M, Huemer M, Karall D, Martinelli D, Crespo PS, Santer R, Servais A, Valayannopoulos V, Lindner M, Rubio V, and Dionisi-Vici C. "Suggested guidelines for the diagnosis and management of urea cycle disorders." Orphanet Journal of Rare Diseases 2012: 7, 32. doi:10.1186/1750-1172-7-32. PMC 3488504. PMID 22642880 Retrieved  http://www.ojrd.com/content/7/1/32 

Interactive Concepts in Biochemistry - Interactive Animations. John Wiley & Sons Publishers, Inc. 2002. Retrieved http://www.wiley.com/legacy/college/boyer/0470003790/animations/cell_structure/cell_structure.htm

Prasad S, Dhiman RK, Duseja A, Chawla YK, Sharma A, Agarwal R. "Lactulose improves cognitive functions and health-related quality of life in patients with cirrhosis who have minimal hepatic encephalopathy." Hepatology 2007: 45 (3): 549 -- 59.

Washing and Use of Testosterone:
The Action of Hand Soap Bacteria:

Hand washing is an important practice for body hygiene because of its seeming effectiveness in preventing the transmission of bacteria. Actually, it is believed that hand washing helps to lessen the risk of bacterial infection through removing and destroying bacterial cells. Generally, the use of hand soap while complying with the good washing practices help an individual to destroy bacteria in the hands, which in turn decreases the spread of diseases or illnesses. The need to wash hands using hand soap is attributed to the accumulation of bacteria on the surface of a person's hands because of numerous opportunities brought by day-to-day activities. For instance, a person encounters bacteria every time he/she touches another individual, touches raw meat, and handles money. The bacteria can get into the individual's hands and under his/her fingernails and spread if he/she touches any other…...

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References:

Angkadjaja, S. (2012). What Makes Antibacterial Soap Antibacterial? Retrieved from Illumin

University of Southern California website:  http://illumin.usc.edu/printer/68/what-makes-antibacterial-soap-antibacterial/ 

Singer, N. (2006, August 10). Does Testosterone Build A Better Athlete? The New York Times.

Retrieved December 4, 2013, from  http://www.nytimes.com/2006/08/10/fashion/10Fitness.html?pagewanted=all&_r=0

When watching a scary movie alone at night, this system is likely to become engaged due to the perception of a threat; sudden noises are likely to cause an involuntary flight reaction that, of course, subsides after a moment.
8)

Temporal summation in a nerve cell occurs when the length of time over which successive activation potentials occur is sufficiently long enough to allow for the potentials to continue to the point where they begin to overlap. When this occurs, a new activation starts to begin before the climax of the preceding action potential has been reached. This action potential essentially ends prematurely, or summates, as it begins the rise into the next action potential, which ends up being larger in magnitude than the constituent action potentials. Summation of active potential in muscle fibers allows for similarly larger action potentials, which can increase the strength of the fiber contractions.

9)

There are two…...

living things are characterized by the following seven characteristics namely mobility, respiration, excretion, sensitivity or response to external stimulus, growth, feeding, and reproduction. Though there may be variations between animal and plant kingdom (ex, plants take in carbon dioxide and prepare their own food), these characteristics are commonly observed among all living things.
iology is a very broad field that encompasses the study of characteristics of living things. It includes botany, zoology and all other sub-disciplines that range from microbiology to evolution and ecology.

Evolution is the branch of biology that deals with the study of natural development of living organisms and the changes in them over time. Evolution refers to the heritable changes that occur in a population over a period of time. All the diversity that is observed currently in plant and animal kingdom can be ascribed to evolution over a long period of time.

Atoms are the smallest, fundamental…...

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Bibliography

1) Mark Rothery, "Cells," Accessed on Sep 20th 2005, Available from http://www.mrothery.co.uk/cells/cellnotes.htm

S. Congress that the prospects of stem cell research were so vast that it could touch all the realm of medicine (Connor 2000). An unlimited source of embryonic stem cells will solve the problem of shortage of transplants. Embryonic stem cells will save lives by curing generative diseases of the brain, hepatitis, diabetes, leukemia, rheumatoid arthritis, muscular dystrophy and cystic fibrosis and diseases of the heart and kidneys. ut current laws restrict the use of stems cells on embryos less than 14 days old and for correcting fertility, reproduction or congenital disorders. The restriction is grounded in the belief that the embryo is a potential human being from the moment of conception. It thus possesses a soul and a dignity just like any other viable person (Connor). Previous scientific research presented evidence that genetically engineering cells could partly repair a defective immune system (Travis 2002). Two new studies bolstered this…...

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Bibliography

Bauer, D.G. (2005). Review of the endocrine system. MedSurg Nursing: Jannetti Publications, Inc.

Connor, S. (2000). Science: the miracle cure with a catch. The London Independent: Newspaper Publishing PLC

Degen. D (2008). Body organization and homeostasis. 1 page. Bones, Muscles and Skin. Pearson Education, Inc.: Pearson Prentice Hall

Farabee, M.J. (2006). Animal organ systems and homeostasis. 18 web pages. Estrella Mountain Community College. Retrieved on February 1, 2006 at http://www.emc.maricopa.edu/faculty/farabee/biobk/BioBookMUSSKEL.html

Desiccation Tolerance in Prokaryotes
Prokaryotes or eukaryote is the organism that makes up the microbial world. Prokaryotes are deficient of internal unit membranes and are self-sufficient cells or organisms. The best-known prokaryotic organisms are the bacteria. The cell membrane in prokaryotes makes up the cell's primary osmotic barrier and consists of a phsopholipids unit membrane. The ribosome carries out translation and protein synthesis and is present in the cytoplasm. Normally, the nuclear regions consist of circular, double-stranded deoxyribonucleic acid.

Plasmids, the accessory self-replicating genetic structure is present in many prokaryotes with extra not necessary cell functions like encoding proteins to inactivate antibiotics. On the other hand, the eukaryotic cells have a nuclear membrane, well-defined chromosomes, mitochondria, a sector device, an endoplasmic reticulum and digestive system with many cell types. The prokaryotes are deficient of structural multiplicity and consist of millions of genetically distinct unicellular organism, which is well-known among eukaryotes and they…...

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References

Desiccation tolerance of prokaryotes" Retrieved at  http://www.cryonet.org 

Engineering desiccation tolerance in Escherichia coli" Billi, Daniela; Wright, Deborah J; helm, Richard F. Pricket, Todd; Potts, Malcolm; Crowe. John H. Retrieved at gov. plhttp://www.nencki.

Major groups of prokaryotes" Retrieved at  http://www.bact.wisc.edu 

Mechanisms of plant desiccation tolerance" Hoekstra, Folkert A; Golovina, Elena; Buitink, Julia. Retrieved at  http://www.plantstress.com

Antibacterial Properties of Silver Nanoparticles from Euphorbia: A Literature Review
Silver nanoparticles (AgNPs) have gained significant attention for their potent antibacterial properties. Euphorbia, a diverse genus of flowering plants, has emerged as a promising source for synthesizing AgNPs. This review investigates the antibacterial properties of AgNPs derived from Euphorbia species, summarizing the key findings reported in scientific literature.
1. Synthesis of AgNPs from Euphorbia
AgNPs from Euphorbia are typically synthesized using plant extracts or biological components. The reducing agents present in the extracts, such as flavonoids, terpenoids, and reducing sugars, facilitate the reduction of silver ions to form AgNPs. The particle size, shape,....

1. The Structure and Function of Cell Organelles
2. Cell Division: Mitosis vs. Meiosis
3. The Role of Stem Cells in Regenerative Medicine
4. The Impact of Genetics on Cellular Function
5. The Importance of Cell Communication and Signaling
6. Cellular Respiration: How Cells Produce Energy
7. The Role of Cell Membranes in Maintaining Homeostasis
8. The Connection Between Cancer and Abnormal Cell Growth
9. Cellular Adaptations to Environmental Stress
10. The Evolution of Cells: From Prokaryotes to Eukaryotes.
11. The Role of Epigenetics in Cellular Differentiation and Development
12. Cell Aging: The Effects of Telomeres and Cellular Senescence
13. The Impact of Environmental Toxins on Cell Health and Function
14. The Relationship....

Cellular Structure and Function

1. The Cell Theory: A Cornerstone of Biology
- Trace the history and contributions of cell theory pioneers like Schleiden, Schwann, and Virchow.
- Discuss the key tenets of cell theory and their implications for understanding the structure and function of life.

2. The Diversity of Cell Types: From Prokaryotes to Eukaryotes
- Describe the structural and functional differences between prokaryotic and eukaryotic cells.
- Explore the specialized cell types found in multicellular organisms, including plant and animal cells.

3. Cellular Membranes: Gatekeepers of Life
- Explain the structure and composition of cell membranes.
- Discuss the functions of....

Genomic Insights into Klebsiella pneumoniae Bacteriophages Isolated in Ho Chi Minh City: A Comparative Analysis of the Key Lytic Proteins Holin, Spanin, and Endolysin Introduction

Klebsiella pneumoniae is a Gram-negative, opportunistic pathogen that causes a wide range of infections, including pneumonia, urinary tract infections, and bloodstream infections. The emergence of multidrug-resistant K. pneumoniae strains has become a major concern in healthcare settings, and there is an urgent need for new antimicrobial strategies.

Bacteriophages, or phages, are viruses that infect and kill bacteria. They have been used as therapeutic agents for centuries, and have recently gained renewed interest as a potential weapon against antibiotic-resistant....