Bacterial Reproduction and Binary Fission

Bacteria are prokaryotic organisms that reproduce asexually. Bacterial reproduction most commonly occurs by a kind of cell division called binary fission. Binary fission involves the division of a single cell, which results in the formation of two cells that are genetically identical. In order to grasp the process of binary fission, it is helpful to understand bacterial cell structure. Key Takeaways Binary fission is the process by which a single cell divides to form two cells that are genetically identical to one another.There are three common bacterial cell shapes: rod-shaped, spherical, and spiral.Common bacterial cell components include: a cell wall, a cellular membrane, the cytoplasm, flagella, a nucleoid region, plasmids as well as ribosomes.Binary fission as a means of reproduction has a number of benefits, chief among them is the ability to reproduce in high numbers at a very rapid rate. Since binary fission produces identical cells, bacteria can become more genetically varied through recombination, which involves the transfer of genes between cells. Bacterial Cell Structure Bacteria have varying cell shapes. The most common bacteria cell shapes are spherical, rod-shaped, and spiral. Bacterial cells typically contain the following structures: a cell wall, cell membrane, cytoplasm, ribosomes, plasmids, flagella, and a nucleoid region. Cell Wall: An outer covering of the cell that protects the bacterial cell and gives it shape.Cytoplasm: A gel-like substance composed mainly of water that also contains enzymes, salts, cell components, and various organic molecules.Cell Membrane or Plasma Membrane: Surrounds the cells cytoplasm and regulates the flow of substances in and out of the cell.Flagella: Long, whip-like protrusion that aids in cellular locomotion.Ribosomes: Cell structures responsible for protein production.Plasmids: Gene carrying, circular DNA structures that are not involved in reproduction.Nucleoid Region: Area of the cytoplasm that contains the single bacterial DNA molecule. Binary Fission This is a colored transmission electron micrograph (TEM) of an E. coli bacterium in the early stages of binary fission. Credit: CNRI / Getty Images Most bacteria, including Salmonella and E.coli, reproduce by binary fission. During this type of asexual reproduction, the single DNA molecule replicates and both copies attach, at different points,  to the cell membrane.  As the cell begins to grow and elongate, the distance between the two DNA molecules increases. Once the bacterium just about doubles its original size, the cell membrane begins to pinch inward at  the center. Finally, a  cell wall  forms  which separates the two  DNA molecules and divides the original cell into two identical daughter cells. This image shows bacteria growing exponentially in a Petri dish. A single colony can have trillions of bacteria. Wladimir Bulgar / Science Photo Library / Getty Images There are a number of benefits associated with reproduction  through binary fission. A single bacterium is able to reproduce in high numbers at a rapid rate. Under optimum conditions, some bacteria can double their population numbers in a matter of minutes or hours. Another benefit is that no time is wasted searching for a mate since reproduction is asexual. In addition, the daughter cells resulting from binary fission are identical to the original cell. This means that they are well suited for life in their environment. Bacterial Recombination Binary fission is an effective way for bacteria to reproduce, however, it is not without problems. Since the cells produced through this type of reproduction are identical, they are all susceptible to the same types of  threats, such as environmental changes and  antibiotics. These hazards could destroy  an entire colony. In order to avoid such perils, bacteria can become more genetically  varied  through recombination. Recombination involves the transfer of genes between cells.  Bacterial recombination is accomplished through conjugation, transformation, or transduction. Conjugation Some bacteria are capable of transferring pieces of their genes to other bacteria that they contact. During conjugation, one bacterium connects itself to another through a protein tube structure called a pilus. Genes are transferred from one bacterium to the other through this tube. Transformation Some bacteria are capable of taking up DNA from their environment. These DNA remnants most commonly come from dead bacterial cells. During transformation, the bacterium binds the DNA and transports it across the bacterial cell membrane. The new DNA is then incorporated into the bacterial cells DNA. Transduction Transduction is a type of recombination that involves the exchange  of bacterial DNA through bacteriophages. Bacteriophages are viruses that infect bacteria. There are two types of transduction: generalized and specialized transduction. Once a bacteriophage attaches to a bacterium, it inserts its genome into the bacterium. The viral genome, enzymes, and viral components are then replicated and assembled within the host bacterium. Once formed, the new bacteriophages lyse or split open the bacterium, releasing the replicated viruses.  During the assembling process, however, some of the hosts bacterial DNA may become encased in the viral capsid instead of the viral genome. When this bacteriophage infects another bacterium, it injects the DNA fragment from the previously infected bacterium. This DNA fragment then becomes inserted into the DNA of the new bacterium. This type of transduction is called generalized transduction. In specialized transduction, fragments of the host bacteriums DNA become incorporated into the viral genomes of the new bacteriophages. The DNA fragments can then be transferred to any new bacteria that these bacteriophages infect. Sources Reece, Jane B., and Neil A. Campbell. Campbell Biology. Benjamin Cummings, 2011.

Network Security Analysis of Windows Server 2008

Solution 1: With Windows Server 2008 Applications, you can make OUs, Groups and Users, and can set GPOs for the OUs, Groups and / or Users requirements or restrictions. Below are some reasons for upgrading to Windows Server 2008 R2 with service Pack 1(SP1). As we go through each one of the issues stated above, we address the concerns and exploit Windows Server 2008. With the new technology of today and the improvements with Windows Server 2008, not only is Windows Server 2008 an OSI, but it is much more. So let us take a look at some of the good reasons for upgrading. Windows Server provides new virtualization technology that enables you to deliver more advanced capabilities to your business for increased IT efficiency and agility. Whether you want to consolidate servers, build a private cloud, or offer Virtual Desktop Infrastructure, the addition of these powerful virtualization features enables you to take your datacenter and desktop virtualization strategy to a new level. Windows Server is the newest Windows Server operating system from Microsoft. It is designed to help organizations reduce operating costs and increase efficiencies and agility. 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Life, Liberty, and the Pursuit of Happiness Free Essays

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 17109201 ? ? ? ? ? ? ? ? ? ? ? ? ? 2012. 1. 5 Life, Liberty, and the Pursuit of Happiness ——A Probe into the Character of Emily A Rose for Emily is a short story written by American author William Faulkner first published in the April 30, 1930 issue of Forum. We will write a custom essay sample on Life, Liberty, and the Pursuit of Happiness or any similar topic only for you Order Now It describes the tragedy of a typical southern lady, Miss Emily, who is deeply victimized in her character and mind by the conventional system of the South and patriarchy; thus even though she wants to fight, she still fails to confront and deal with the changes caused by the shock of northern industrialization all by herself and finally leads to destruction and self-destruction on the way of pursuing happiness. This essay concentrates on exploring the character of Emily with the efforts she has made for her life and especially the reasons for her failure in â€Å"fighting† from the three aspects as Life, Liberty, and the Pursuit of Happiness, (the well-known phrase applied from the United States Declaration of Independence). 1. The Backup of Early Life As a descendent of the southern conventional noble family, Emily was born in the environment full of the thought of feudalism and hierarchy which makes her acquire not only the attitude of arrogance and indifference to common people, but, most importantly, the habit of obedience to her father. Before her father dies, he is the only one Emily could rely on in her family. Therefore, there should be no blame to her that she depended on her father when she was still young, just as most of us would depend on our parents during our childhood and youth. However, the fact the she gets to be thirty and is still single reveals the abnormality of the dependence. Actually, it is no longer pure dependence on her father. Instead, the dependence has developed into over obedience which then is taken advantage of by her father to control her completely under the constraint of the old southern tradition. The control is just described by William Faulkner as the tableau, â€Å"Miss Emily a slender figure in white in the background, her father a spraddled silhouette in the foreground, his back to her and clutching a horsewhip, the two of them framed by the back-flung front door†. The father, a typical symbol of patriarchy, clutching a horsewhip, acts as a tyrant. It’s him who holds the Griersons always a little too high for what they really are and uses his horsewhip, which exactly symbolizes patriarchy, to beat off all of the young men who come to make proposals to his daughter, Miss Emily, believing that no one is quite good enough for her. In fact, in his opinion, none of the young men are quite good enough not for his daughter, but for the old southern tradition and its dignity. He never regards Emily as an independent individual. On the contrary, he regards her as the tool to maintain their dignity in the conventional system. However, Emily has been regarding her father as the whole backup of her life since she was born. What’s more, she has been in this state for more than thirty years. She has long been used to this dependence and even allows this kind of dependence to conquer her strong desire for free life and love. To her, this dependence is just her whole life. Therefore, when her father dies, she cannot accept the fact because her father is her whole dependence and the dependence is just her whole life. Her father’s death has also deprived all the hope of her life. Her father and the old tradition her father represents are the root of Emily’s tragedy; thus, her father’s death should be regarded as the chance for Emily to free herself from the constraint of the conventional system. It’s the beginning of Emily’s fighting for her own life, liberty and happiness. 2. Liberty Getting rid of her father’s control is just like releasing from a prison. After a long time of being sick, she is seen again with hair cut short and looks like a girl, which declares the beginning of her liberty. However, Faulkner describes her as resembling to those angels in colored church windows—sort of tragic and serene. The word of â€Å"tragic† seems to have indicated the sad ending of Emily’s life even though she has the chance to gain liberty. And the reason lies on Emily’s wrong interpretation of liberty. From the description by Faulkner, after her father’s death, the character of Emily appearing before the readers is still such an arrogant and indifferent person typically symbolizing the old tradition. It is clearly known by the readers that actually Emily never frees herself from the fetter of the conventional system even though she has gotten rid of her father’s control. However, Emily sees her liberty from a different angle. To her, liberty means to live in a way she has long been used to at her own will. Since her father died, nobody and nothing can ever take her under control any more. Therefore, she ignores all the others’ denouncing the smell of her house, vanquishes the new generation’s demanding her taxes and rejects the newer generation’s attaching a mailbox. She still carries her head high enough—even when others all believe that she is fallen, because the way of living she has been used to is just to maintain dignity as much as she can in the environment of the old southern tradition. She refuses to free herself from the conventional system because it’s the very place she feels relatively free. In contrast, the new world with all those changes caused by the shock of northern industrialization is where she will feel unsafe, uneasy and uncomfortable. Similarly in the film The Shawshank redemption, the two people, the old log, Brooks, and one of the protagonists, Red, have much difficulty in adjusting themselves to the life outside after they get their parole from decades of imprisonment. Brooks even commits suicide and Red can never pea unless asking for permission. And Emily has also been imprisoned for more than thirty years which has made her long ago assimilated by the old tradition. Emily has made efforts for her life and liberty after her father’s death. Unfortunately, she interprets her liberty in the way which is against the development of the new world both in aterial and spiritual aspects. And her false interpretation is still due to the over thirty years’ imprisonment of patriarchy and the conventional system of the South. 3. The Pursuit of Happiness Even though the living style has been assimilated by the convention, there is still something that everyone is born with including Emily. That is the desire for happiness. Emily lives in her own old world but all alone. She earns liberty but lacks happiness. Therefore, when Homer Barron shows up, she believes that he is the source of her happiness and makes up her mind to grasping the slight of hope. However, the chance of gaining happiness is ruined again by the conflict between her old world and the shock of northern industrialization. What’s worse, finally she leads to the road of destruction and self-destruction by her extreme desire resulting from patriarchy and the old tradition’s severe oppression Homer Barron, a Yankee, comes from the north and symbolizes the northern industrialization, which is definitely against the old tradition and even some basic principles of Emily’s own old world such as the feature of dignity. But on the other side, he seems to Emily the hope for her happiness. As a woman oppressed by spiritual loneliness for such a long time, the desire for love and happiness is strong enough to for Emily to conquer the continual restraint of conventional hierarchical thought. As a result, she goes out of the old house, which symbolizes the convention, with her head high and together with Homer Barron with his hat cocked and a cigar in his teeth, reins and whip in a yellow glove driving in the glittering buggy on Sunday afternoons. She even decides to marry him by buying a complete outfit of men’s clothing regardless of all the objects and conflicts. During this period, she has gradually become deeply trapped in the love and happiness with Homer Barron. She has been oppressed by patriarchy and the southern convention for more than thirty years, and now the love she is experiencing is so unique and incomparable that it has become the whole happiness of her life and that it is impossible for her to let it go. If Homer Barron isn’t going to leave her, then the love and happiness will certainly continue. However, as the symbol of northern industrialization, Homer Barron holds a completely opposite attitude towards the relationship with Miss Emily. He just regards it as a pure way of entertainment without any responsibility, which is a sharp conflict between not only Homer and Emily, but also the morals of northern industrialization and the old southern convention. Under the pressure of the conflicts and the long-term victimization by patriarchy and the convention, Emily’s character and mind has been completely deformed. In the end, to prevent the happiness from disappearing, Emily takes drastic measures as killing Homer and let the body stay with her forever so that her love and happiness will also never leave. This measure finally destroys her whole life and leaves her a complete tragedy as well as Homer Barron. In this extraordinary short story, the character of Emily William Faulkner created has made some efforts to earn her own life and liberty and even persist in the pursuit of happiness. However, her life is based on patriarchy and the conventional system of the South for more than 30 years; the liberty she goes after is still trapped in the old tradition; and her pursuit of happiness comes across the conflicts between the southern old tradition and the shock of northern industrialization. All of these negative factors lead to the final tragic destruction. References Olga W. Vickery. The Novels of William Faulkner: A Critical Appraisal [M]. Baton Rouge: Louisiana State University Press, 1964 Fang Yigui [ ]. [J]. ,2007 1 Liu Aiying [ ]. [J]. ,1998 2 Liu Zhuo [ ] Peng Changliu [ ]. : [J]. ,2004 5 Wang Minqin [ ]. [J]. ,2002 2? ,? 66-69 Xiao Minghan [ ].  ·. : ,1997? How to cite Life, Liberty, and the Pursuit of Happiness, Papers

The Charismatic Leadership Style free essay sample

The Charismatic Leadership Style I have chosen to write my journal article on a leadership style known as a Ccharismatic Leader. Its difficult to identify the characteristics that make a leader charismatic, but they certainly include the ability to communicate on a very powerful emotional level, and probably include some personality traits. I do not believe that charismatic leadership is essential to be an effective leader but it can enhance the leadership journey. The Charismatic Leader gathers followers through based upon their personality and charm, rather than any form of external power or authority. Possessing these characteristics can be an extremely powerful way to gain and lead others. They can also make their followers (ordinary people) do some pretty extraordinary things. Charismatic leaders have the ability to sense the gap that exists between what an organization and culture of people and empower them to come together as one. By bridging this gap the leader can create a vision of a future state that everyone believes will be better than the current one. We will write a custom essay sample on The Charismatic Leadership Style or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The charismatic leader often communicates their vision using metaphors and stories in ways that everyone can understand the vision. Their followers see the leader as one that possesses the ability to visualize the future with clarity. Their followers are also able to see how they fit into this future state and believe it will be better than today. Charismatic leaders do these things constantly in large and small ways. Charismatic Leaders are visionaries. They focus on transforming situations, not just maintaining. They will show great confidence in their followers. They are very persuasive and make very effective use of body language as well as verbal language. Many politicians use a charismatic style, as they need to gather a large number of followers. The person who I think is a great charismatic leader is Barack Obama. I have listened to a lot of his speeches and he has the power to motivate and empower people with his words, his testimony and his story of overcoming many trials and obstacles. Barack Obama is often compared to John F. Kennedy, who is arguably the most charismatic President of the United States. â€Å"Todays environment emphasizes organizational learning and follower empowerment conditions that promote mutual respect and dialogue. However, even in this environment leaders can, sometimes unwittingly, enact subtle abuses. Generally included in the typical definition of power are the notions of dependency and control: a leaders ability to determine followers behavior stems at least in part from the followers dependency on the leader. This, in turn, is based on leaders control over the various aspects of organizational life affecting followers or perceived as needed by followers, such as material resources and organizational advancement.