Three Domain System

Three Domain System The Three Domain System, developed by Carl Woese, is a system for classifying biological organisms. Over the years, scientists have developed several systems for the classification of organisms. From the late 1960s, organisms had been classified according to a Five Kingdom system. This classification system model was based on principles developed by Swedish scientist Carolus Linnaeus, whose hierarchical system groups organisms based on common physical characteristics. The Three Domain System As scientists learn more about organisms, classification systems change. Genetic sequencing has given researchers a whole new way of analyzing relationships between organisms. The current system, the Three Domain System, groups organisms primarily based on differences in ribosomal RNA (rRNA) structure. Ribosomal RNA is a molecular building block for ribosomes. Under this system, organisms are classified into three domains and six kingdoms. The domains are Archaea, Bacteria, and Eukarya. The kingdoms are Archaebacteria (ancient bacteria), Eubacteria (true bacteria), Protista, Fungi, Plantae, and Animalia. Archaea Domain This domain contains single-celled organisms known as archaea. Archaea have genes that are similar to both bacteria and eukaryotes. Because they are very similar to bacteria in appearance, they were originally mistaken for bacteria. Like bacteria, Archaea are prokaryotic organisms and do not have a membrane-bound nucleus. They also lack internal cell organelles and many are about the same size as and similar in shape to bacteria. Archaea reproduce by binary fission, have one circular chromosome, and use flagella to move around in their environment as do bacteria. Archaea differ from bacteria in cell wall composition and differ from both bacteria and eukaryotes in membrane composition and rRNA type. These differences are substantial enough to warrant that archaea have a separate domain. Archaea are extreme organisms that live under some of the most extreme environmental conditions. This includes within hydrothermal vents, acidic springs, and under Arctic ice. Archaea are divided into three main phyla: Crenarchaeota, Euryarchaeota, and Korarchaeota. Crenarchaeota include many organisms that are hyperthermophiles and thermoacidophiles. These archaea thrive in environments with great temperature extremes (hyperthermophiles) and in extremely hot and acidic environments (thermoacidophiles).Archaea known as methanogens are of the Euryarchaeota phylum. They produce methane as a byproduct of metabolism and require an oxygen-free environment.Little is known about Korarchaeota archaea as few species have been found living in places such as hot springs, hydrothermal vents, and obsidian pools. Bacteria Domain Bacteria are classified under the Bacteria Domain. These organisms are generally feared because some are pathogenic and capable of causing disease. However, bacteria are essential to life as some are part of the human microbiota. These bacteria preform vital functions, such as enabling us to properly digest and absorb nutrients from the foods we eat. Bacteria that live on the skin prevent pathogenic microbes from colonizing the area and also aid in the activation of the immune system. Bacteria are also important for the recycling of nutrients in the global ecosystem as they are primary decomposers. Bacteria have a unique cell wall composition and rRNA type. They are grouped into five main categories: Proteobacteria: This phylum contains the largest group of bacteria and includes E.coli, Salmonella, Heliobacter pylori, and Vibrio. bacteria.Cyanobacteria: These bacteria are capable of photosynthesis. They are also known as blues include Borrelia burgdorferi (cause Lyme disease) and Treponema pallidum (cause syphilis). Eukarya Domain The Eukarya domain includes eukaryotes or organisms that have a membranes include algae, amoeba, fungi, molds, yeast, ferns, mosses, flowering plants, sponges, insects, and mammals. Comparison of Classification Systems Five Kingdom System: MoneraProtistaFungiPlantaeAnimalia Archaea Domain Bacteria Domain Eukarya Domain Archaebacteria Kingdom Eubacteria Kingdom Protista Kingdom Fungi Kingdom Plantae Kingdom Animalia Kingdom Three Domain System As we have seen, systems for classifying organisms change with new discoveries made over time. The earliest systems recognized only two kingdoms (plant and animal). The current Three Domain System is the best organizational system we have now, but as new information is gained, a different system for classifying organisms may later be developed.

A Teachers Basic Guide to Making a Referral

A Teachers Basic Guide to Making a Referral A referral is a process or steps a teacher takes to get extra assistance for a student that they work directly with on a regular basis. In most schools, there are three distinct types of referrals. Those include referrals for disciplinary issues, referrals for special education evaluations, and referrals to receive counseling services.   A referral is completed when a teacher believes that a student needs some intervention to help them overcome obstacles that may be preventing them from being successful. All referral situations are dictated by the behavior and/or actions of the student. Teachers need professional development and training to recognize specific signs that would indicate when a student may have an issue that requires a referral. Prevention training is more appropriate for discipline referrals, but recognition training would be beneficial for referrals associated with special education or counseling.   Each type of referral has distinct steps that a teacher must follow according to school policy. With the exception of a counseling referral, a teacher must establish that they have attempted to improve the issue before making a referral. Teachers should document any steps that they have taken to help a student improve. Documentation helps establish a pattern which ultimately justifies the need for a referral. It may also help those involved with the referral process in establishing a plan to help the student grow. This process can take a lot of time and extra effort on the teachers part. Ultimately, the teacher must prove that they have exhausted all of their individual resources in most cases before making a referral. Referral for Discipline Purposes A discipline referral is a form a teacher or other school personnel writes up when they want the principal or school disciplinarian to deal with a student issue. A referral typically means that the issue is a serious issue, or it is an issue in which the teacher has tried to handle on without any success. Key Questions to Ask Before Making a Disciplinary Referral Is this a serious issue (i.e. fight, drugs, alcohol) or potential threat to other students that requires immediate attention by an administrator?If this is a minor issue, what steps have I taken to handle the issue myself?Have I contacted the students parents and involved them in this process?Have I documented the steps that I have taken in an attempt to correct this issue? Referral for a Special Education Evaluation A special education referral is a request for a student to be evaluated to determine whether the student is eligible to receive special education services that may include areas such as speech language services, learning assistance, and occupational therapy.  The referral is typically a written request by either the students parent or their teacher. If the teacher is completing the referral, he or she will also attach evidence and samples of work to show why they believe the student needs to be evaluated. Key Questions to Ask Before Making a Special Education Referral What are the exact issues that the student has that lead me to believe that special education services are appropriate?What evidence or artifacts can I produce that supports my belief?What documented steps of intervention have I taken to try to help the student improve before making a referral?Have I discussed my concerns with the childs parents also gaining insight into the childs history? Referral for Counseling Services A counseling referral can be made for a student for any number of legitimate concerns. Some common reasons include: A student is going through a traumatic family issue (i.e. divorce, death in the family).A student exhibits signs of depression and/or withdrawal.A students grades suddenly drop or there is a drastic change in behavior.  A student cries often, gets sick daily, or expresses anger/frustration regularly.A student who has difficulty functioning in the classroom (i.e. behavior issues, will not do work, skips school often, extreme aggressiveness).

Metaphors Essay Example | Topics and Well Written Essays - 750 words - 2

Metaphors - Essay Example In the first case study, there is an issue that is being faced by the managers is the need to hold dowen the line against the senior managers who are aggressive. This is a great problem because it seriously impacts on their relationship with their subordinates and hence their attitudes and performances in their work. In this sense, it is one of the hindrances towards productivity as most of the employees are expected to work as machines. Using the Morgan’s use of metaphors to understand the organization is well applied in this scenario. The manager is able to note down a few of the Morgan’s metaphors in his work. They include the art of blowing up in order to defend his people. In this context, he drills the individual and then attacks. In essence, he has identified work as a battle whereby there is a great need to fight in order to ensure that the rights of all the employees are not violated. It is caused by the element of being in the heat of the battle to enable an i ndividual to defend their territories hence the need to understand how the organization works. It is with the notion that the work place is a battle field that the manager in this case has devised the proper ways of dealing with his colleagues in such a way that enhances the productivity of all the other employees. The main problem in this case is the need to come up with a new product. It is the principle issue that is causing worries to the director in this organization. It is mainly because the product is required in high degree autonomy. It was also supposed to appear to be an integral part of the existing company. In this sense, the metaphor is created through the use of the symbolic modeling. Ultimately, there is the launch of a central launch pad from which the hot air balloon can rise and ascend. Although this balloon was always navigated by the captain, it was always tied to the launch pad. This defined its safety and scope

People, Organisations and Leadership Assignment

People, Organisations and Leadership - Assignment Example One of the notable companies that have embarked on undertaking strategic management is Alpha Reminiscent Cars (ARC). Based on the increased demand for old style cars as well as old out-of-manufacture saloons and sports cars, the company owners are now focused at expanding their production capacity in order to meet the demand of their customers. The company has two alternatives that it can use in order to expand its production. Firstly, the owners can double its work force in order to have 12 teams leading to production of 240 units. Secondly, the company can also use automated assembly-line approach. The key aim of this paper is to compare the two approaches and indicate the one that will increase ARC profit while at the same time making the employees happy. Additionally, the paper discusses issues that will be solved by the two approaches. To achieve its objective, the paper will base its argument on studies done by various individuals on team and automated assembly-line approaches. Literature reviews on merits and demerits of team and assembly line robotic approaches In his studies on evaluating a team-based approach, Libby (2012) contemplates that team approach is beneficial in that it will create opportunities for creativity. As the ARC aims at producing models that meet the needs of its customers, it will be essential for managers to create a culture of creativity. It is vital to note that if a larger number of people are involved in making a decision or coming up with a solution to a problem, each one of the team member will provide his or her idea. Afterwards the team members deliberate of the best idea and then develop it to quality products. ARC will thus benefit from improved models as a result of use of team approach. Additionally, Libby (2012) portrays team approach as a way of enhancing research skills of individuals of the team members. In this way, individuals are in a position to bring in board skills and contribution that will improve the quali ty of the final products. Another advantage of using team approach is that the company rate of production will increase (Robbins and Judge, 2007). In a work place, employees have different weaknesses and strengths. This implies that during the tackling of any project, team managers can delegate the workload among team members based on their skills and experience. As a result, a project can be completed in a timely manner. In the case of ARC, the use of team approach will ensure that the car models are manufactured is a faster rate without compromising their quality. Studies on qualitative methods in a team approach by Whitt and Kuh, (1991) indicates that in addition to the use of competitive salary, workers are motivated by working a team. Through expansion of its team, ARC will enhance the morale of its employees. It is essential to note that when a company arranges its workforce in the form of teams that are under skilled team managers, the employees are in a position to know each other. As a result, a good relationship is created in the work place. By sharing ideas, employees self esteem is attained thus improving their productivity leading to an increased output and sales. Fishbein and Ajzen (1975) depicts that team approach provides workers with chances of developing. It is fundamental to note that big and small companies keenly look for skills possessed by their employees during the recruitment process. In this regard, teams are formed by members with

Democratic Education Essay Example for Free

Democratic Education Essay Democratic Education should be a mainstream style of teaching, and should be taught specifically to anyone aspiring to become any type of successful instructor. Everywhere you go the world is constantly changing, people adapt, time ticks away, and the days come and go, every waking moment is progression to the future. Why is the one thing that we as a society depend on for survival going backwards? Our education system and the way we educate children is the only tool we as a society use to ensure our existence, think of the world as a well oiled machine. If you neglect certain parts, yes maybe it will keep working for a short while. Eventually the machine will fall apart because of the mistreating and lack of or poor maintenance, if we keep neglecting our education system by turning a blind eye to the type of educators we give teaching credentials to or the way our current teachers or professors are instruction our future, then our existence is headed for an abrupt halt. Schools need to embrace interesting, interactive-learning environments throughout the curriculum. â€Å"If you do not want to do something, you will not, period.† This thought means if someone is in a place that does not at least entertain the senses, let alone stimulate the mind then why even waste the time to just be physically be present? By doing that it wastes money, and more importantly the teacher and the students time. Democratic education as a teaching style is based on â€Å"affirmative authority without disrespect of freedom†; Democratic Education, by bell hooks. Authoritative guidance with inspiring, limitless, encouragement should be the goal of every type of educational course offered in the United States. We need to input this style of teaching into our aspiring teachers required classes to graduate at any institution or university across the country. We need democratic education because this type of teaching inspires the students, just because someone passes a test or any kind of written exam does not determine someones intelligence. The definition of the term intelligence, according to www.google.com, means the ability to acquire and apply knowledge and skills. This applies to institutions and their instructors because if a pupil is not taught how to apply these skills he or she has been taught how does this apply to the fast-pace times that we live in today? The answer is, it does not. Democratic education benefits the entire classroom rather than just a select few because of the more upbeat style of teaching. The beauty of democratic education is that it can also be incorporated with the old style of a more text-geared curriculum as well. It has the potential to improve teaching as a profession because it would lengthen the required courses to become a teacher, therefore narrowing the number of instructors produced. With that being said, the teaching salaries can improve because of the new demand for this productive style of teaching that K-12 schools would require the employed instructors to have completed during their college career(s). Our future generations upbringing needs to be updated according to the new age that we live in today. Democratic education needs to be a mainstream style of teaching, not for our benefit, but for the future of the precious world that you and I share. This is not a type of thing to be organized and implemented to help certain individuals succeed but for everyone, we need to teach our children that as a country we are a collective, and as individuals we are our own. Democratic education be used as another tool to help us educate the country and create a more successful tomorrow.

Radio Frequency Identification (RFID) Essay -- microchip radio waves i

Radio Frequency Identification (RFID) Radio frequency identification, or RFID, is a generic term for technologies that use radio waves to automatically identify people or objects. There are several methods of identification, but the most common is to store a serial number that identifies a person or object, and perhaps other information, on a microchip that is attached to an antenna (the chip and the antenna together are called an RFID transponder or an RFID tag). The antenna enables the chip to transmit the identification information to a reader. The reader converts the radio waves reflected back from the RFID tag into digital information that can then be passed on to computers that can make use of it. RFID is a better technology than bar codes in many ways. The two are different technologies and have different applications, which sometimes overlap. The big difference between the two is bar codes are line-of-sight technology. That is, a scanner has to "see" the bar code to read it, which means people usually have to orient the bar code towards a scanner for it to be read. Radio frequency identification, by contrast, doesn't require line of sight. RFID tags can be read as long as they are within range of a reader. Bar codes have other shortcomings as well. If a label is ripped, soiled or falls off, there is no way to scan the item. And standard bar codes identify only the manufacturer and product, not the unique item. The bar code on one milk carton is the same as ever...

Life Is a Game Essay

â€Å"Each player must accept the cards life deals them: but once they are in hand, they alone must decide how to play in order to win the game. † – Voltaire â€Å"For when the One Great Scorer comes To write against your name, He marks – not that you won or lost – But how you played the game. † – Grantland Rice â€Å"My work is a game, a very serious game. † – M. C. Escher â€Å"A game is not won until it is lost. † – David Pleat â€Å"Play the game for more than you can afford to lose†¦ only then will you learn the game. † – Winston Churchill. â€Å"Daring ideas are like chessmen moved forward; they may be beaten, but they may start a winning game. † – Johann Wolfgang von Goethe â€Å"Most people give up just when they’re about to achieve success. They quit on the one yard line. They give up at the last minute of the game one foot from a winning touchdown. † – Ross Perot â€Å"It’s the game of life. Do I win or do I lose? One day they’re gonna shut the game down. I gotta have as much fun and go around the board as many times as I can before it’s my turn to leave. † – Tupac Shakur. â€Å"If you’re willing to put two thoughts into a picture then you’re already ahead of the game. † – Sean Penn † We know that we’re supposed to win all the games, but if we don’t, we just have to take the next game and focus on what we did wrong in the game before and just try to do better at the next game. † – Shaquille O’Neal â€Å"If past history was all there was to the game, the richest people would be librarians. † – Warren Buffett â€Å"At this stage of the game, I am not sure what’s going to happen. † – Bobby Rahal. â€Å"We didn’t lose the game; we just ran out of time. † – Vince Lombardi â€Å"You have to learn the rules of the game. And then you have to play better than anyone else. † – Albert Einstein â€Å"People have always doubted whether I was good enough to play this game at this level. I thought I was, and I thought I could be. What other people thought was really always irrelevant to me. † – Steve Nash â€Å"The goals made such a difference to the way this game went. † – John Motson â€Å"No coach has ever won a game by what he knows; it’s what his players know that counts. † – Paul Bryant â€Å"It’s more than a game. It’s an institution. † – Thomas Hughes â€Å"If life doesn’t offer a game worth playing, then invent a new one. † – Anthony J. D’Angelo â€Å"If you have the opportunity to play this game of life you need to appreciate every moment. a lot of people don’t appreciate the moment until it’s passed. † – Kanye West â€Å"I’ve missed more than 9000 shots in my career. I’ve lost almost 300 games. 26 times, I’ve been trusted to take the game winning shot and missed. I’ve failed over and over and over again in my life. And that is why I succeed. † – Michael Jordan â€Å"I think it’s wrong that only one company makes the game Monopoly. † – Steven Wright â€Å"So if you want to have a great video game-based movie you have to keep the mood of the game, use the normal character setup – but you have to flesh out the story and provide more background for the characters. † – Uwe Boll â€Å"If you make every game a life and death proposition, you’re going to have problems. For one thing, you’ll be dead a lot. † – Dean Smith. â€Å"Winning that first game was so important; my mother always said that the first game of the second set was the chance to keep it going if you were ahead or change things if you were behind. † – Tracy Austin â€Å"Life is like a game of cards. The hand you are dealt is determinism; the way you play it is free will. † – Jawaharlal Nehru â€Å"We play fair and we play hard. If we win the game we win, if we lose the game, we lose. † – Jason Williams â€Å"The person that turns over the most rocks wins the game. And that’s always been my philosophy. † – Peter Lynch â€Å"Never change a winning game; always change a losing one. † – Bill Tilden.