Biology question to be answered Coursework Example | Topics and Well Written Essays - 250 words

Biology question to be answered - Coursework Example a situation in which organisms from different species compete for the same shared limited resources like food, water and space in which the less fit organism loses. This is a -/+ relationships. Predation, on the other hand, is whereby the predator kills then feeds on the prey while herbivory involves the herbivores feeding on the primary producer.(+/- relationship). Parasitism is a relationship in which one species benefits at the expense of the other but they do not kill the host. Only 10% of energy is transferred to the next trophic level. Most is used in metabolism, and the rest lost through excretion, hence making the successive level be smaller (Townsend et al., 2000). Ecosystems obtain all its energy from the sun that is transformed into chemical energy through photosynthesis in primary producers (plants) and moves up the trophic levels. It is converted to other forms like heat. Matter cycles through the ecosystem in various stages. For example, plants use carbon dioxide present in the atmosphere together with sunlight to make food. Primary consumers consume this food like human beings. Once these consumers die, carbon is stored in fossil fuel that may be mined in future and burned releasing

Future work place competenvy skills Essay Example | Topics and Well Written Essays - 250 words

Future work place competenvy skills - Essay Example Owing to the immense public interaction that this profession requires, health administrators would need to maintain their original self in addition to the mechanized self. Health administration requires a sound knowledge of management. In the contemporary age, methods are being devised to quantify the management. A lot of softwares are being employed in the workplace for organizing the work, which not many public health administrators are able to use. In the present age, people with good knowledge of IT are preferred over others for the job of public health administration. In the coming years, this competition will increase as more and more softwares are being found. Therefore, in order to excel in their field, public health administrators should gain competence in the use of the related softwares. In the University of Phoenix, I came across a diverse population of students from all over the world interacting with whom polished my interpersonal skills. The softwares we were taught wo uld be very beneficial for us in our profession.

Advantages of RTL, DTL and TTL Logic circuit

Advantages of RTL, DTL and TTL Logic circuit Introduction of Logic Gates A logic gate performs a logical operation on one or more logic inputs and produces a single logic output. The logic normally performed is Boolean logic and is most commonly found in digital circuits. Logic gates are primarily implemented electronically using diodes or transistors, but can also be constructed using electromagnetic relays, fluidics, optics, molecules, or even mechanical elements. In electronic logic, a logic level is represented by a voltage or current, (which depends on the type of electronic logic in use). Each logic gate requires power so that it can source and sink currents to achieve the correct output voltage. In logic circuit diagrams the power is not shown, but in a full electronic schematic, power connections are required. Resistor-Transistor Logic (RTL): Resistor-transistor logic gates use Transistors to combine multiple input signals, which also amplify and invert the resulting combined signal. Often an additional transistor is included to re-invert the output signal. This combination provides clean output signals and either inversion or non-inversion as needed. RTL gates are almost as simple as DL gates, and remain inexpensive. They also are handy because both normal and inverted signals are often available. However, they do draw a significant amount of current from the power supply for each gate. Another limitation is that RTL gates cannot switch at the high speeds used by todays computers, although they are still useful in slower applications. Although they are not designed for linear operation, RTL integrated circuits are sometimes used as inexpensive small-signal amplifiers, or as interface devices between linear and digital circuits. RTL Logic Circuit: Resistor-transistor logic (RTL) is a class of digital circuits built using resistors as the input network and bipolar junction transistors (BJTs) as switching devices. RTL is the earliest class of transistorized digital logic circuit used; other classes include diode-transistor logic (DTL) and transistor-transistor logic (TTL). Advantages of RTL Logic circuit: The primary advantage of RTL technology was that it involved a minimum number of transistors, which was an important consideration before integrated circuit technology (that is, in circuits using discrete components), as transistors were the most expensive component to produce. Early IC logic production (such as Fairchilds in 1961) used the same approach briefly, but quickly transitioned to higher-performance circuits such as diode-transistor logic and then transistor-transistor logic (starting 1963 at Sylvania), since diodes and transistors were no more expensive than resistors in the IC. Limitations: The obvious disadvantage of RTL is its high current dissipation when the transistor conducts to overdrive the output biasing resistor. This requires that more current be supplied to and heat be removed from RTL circuits. In contrast, TTL circuits minimize both of these requirements. Lancaster says that integrated circuit RTL NOR gates (which have one transistor per input) may be constructed with any reasonable number of logic inputs, and gives an example of an 8-input NOR gate. A standard integrated circuit RTL NOR gate can drive up to 3 other similar gates. Alternatively, it has enough output to drive up to 2 standard integrated circuit RTL buffers, each of which can drive up to 25 other standard RTL NOR gates. Diode-Transistor Logic (DTL): By letting diodes perform the logical AND or OR function and then amplifying the result with a transistor, we can avoid some of the limitations of RTL. DTL takes diode logic gates and adds a transistor to the output, in order to provide logic inversion and to restore the signal to full logic levels. Diode-transistor logic Diode-Transistor Logic (DTL) is a class of digital circuits built from bipolar junction transistors (BJT), diodes and resistors; it is the direct ancestor of transistor-transistor logic. It is called diode-transistor logic because the logic gating function (e.g., AND) is performed by a diode network and the amplifying function is performed by a transistor (contrast this with RTL and TTL). Operation: With the simplified circuit shown in the picture the negative bias voltage at the base is required to prevent unstable or invalid operation. In an integrated circuit version of the gate, two diodes replace R3 to prevent any base current when one or more inputs are at low logic level. Alternatively to increase fan-out of the gate an additional transistor and diode may be used. The IBM 1401 used DTL circuits almost identical to this simplified circuit, but solved the base bias level problem mentioned above by alternating NPN and PNP based gates operating on different power supply voltages instead of adding extra diodes. Advantages of DTL: One advantage of digital circuits when compared to analog circuits is that signals represented digitally can be transmitted without degradation due to noise. For example, a continuous audio signal, transmitted as a sequence of 1s and 0s, can be reconstructed without error provided the noise picked up in transmission is not enough to prevent identification of the 1s and 0s. An hour of music can be stored on a compact disc as about 6 billion binary digits. In a digital system, a more precise representation of a signal can be obtained by using more binary digits to represent it. While this requires more digital circuits to process the signals, each digit is handled by the same kind of hardware. In an analog system, additional resolution requires fundamental improvements in the linearity and noise charactersitics of each step of the signal chain. Computer-controlled digital systems can be controlled by software, allowing new functions to be added without changing hardware. Often this can be done outside of the factory by updating the products software. So, the products design errors can be corrected after the product is in a customers hands. Information storage can be easier in digital systems than in analog ones. The noise-immunity of digital systems permits data to be stored and retrieved without degradation. In an analog system, noise from aging and wear degrade the information stored. In a digital system, as long as the total noise is below a certain level, the information can be recovered perfectly. Disadvantages: In some cases, digital circuits use more energy than analog circuits to accomplish the same tasks, thus producing more heat. In portable or battery-powered systems this can limit use of digital systems. For example, battery-powered cellular telephones often use a low-power analog front-end to amplify and tune in the radio signals from the base station. However, a base station has grid power and can use power-hungry, but very flexible software radios. Such base stations can be easily reprogrammed to process the signals used in new cellular standards. Digital circuits are sometimes more expensive, especially in small quantities. The sensed world is analog, and signals from this world are analog quantities. For example, light, temperature, sound, electrical conductivity, electric and magnetic fields are analog. Most useful digital systems must translate from continuous analog signals to discrete digital signals. This causes quantization errors. Quantization error can be reduced if the system stores enough digital data to represent the signal to the desired degree of fidelity. The Nyquist-Shannon sampling theorem provides an important guideline as to how much digital data is needed to accurately portray a given analog signal. In some systems, if a single piece of digital data is lost or misinterpreted, the meaning of large blocks of related data can completely change. Because of the cliff effect, it can be difficult for users to tell if a particular system is right on the edge of failure, or if it can tolerate much more noise before failing. Digital fragility can be reduced by designing a digital system for robustness. For example, a parity bit or other error management method can be inserted into the signal path. These schemes help the system detect errors, and then either correct the errors, or at least ask for a new copy of the data. In a state-machine, the state transition logic can be designed to catch unused states and trigger a reset sequence or other error recovery routine. Embedded software designs that employ Immunity Aware Programming, such as the practice of filling unused program memory with interrupt instructions that point to an error recovery routine. This helps guard against failures that corrupt the microcontrollers instruction pointer which could otherwise cause random code to be executed. Digital memory and transmission systems can use techniques such as error detection and correction to use additional data to correct any errors in transmission and storage. On the other hand, some techniques used in digital systems make those systems more vulnerable to single-bit errors. These techniques are acceptable when the underlying bits are reliable enough that such errors are highly unlikely. TTL Logic Circuit: Transistor-transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. It is called transistor-transistor logic because both the logic gating function (e.g., AND) and the amplifying function are performed by transistors (contrast this with RTL and DTL). TTL is notable for being a widespread integrated circuit (IC) family used in many applications such as computers, industrial controls, test equipment and instrumentation, consumer electronics, synthesizers, etc. The designation TTL is sometimes used to mean TTL-compatible logic levels, even when not associated directly with TTL integrated circuits, for example as a label on the inputs and outputs of electronic instruments. *TTL contrasts with the preceding resistor-transistor logic (RTL) and diode-transistor logic (DTL) generations by using transistors not only to amplify the output but also to isolate the inputs. The p-n junction of a diode has considerable capacitance, so changing the logic level of an input connected to a diode, as in DTL, requires considerable time and energy. As shown in the top schematic at right, the fundamental concept of TTL is to isolate the inputs by using a common-base connection, and amplify the function using a common emitter connection. Note that the base of the output transistor is driven high only by the forward-biased base-collector junction of the input transistor. The second schematic adds to this a totem-pole output. When V2 is off (output equals 1), the resistors turn V3 on and V4 off, resulting in a stronger 1 output. When V2 is on, it activates V4, driving 0 to the output. The diode forces the emitter of V3 to ~0.7 V, while V4 base-emitter junction and V2 collector-emitter junction pull its base to a voltage ~0.7, turning it off. By removing pull-up and pull-down resistors from the output stage, this allows the strength of the gate to be increased without proportionally affecting power consumption. TTL is particularly well suited to integrated circuits because the inputs of a gate may all be integrated into a single base region to form a multiple-emitter transistor. Such a highly customized part might increase the cost of a circuit where each transistor is in a separate package, but, by combining several small on-chip components into one larger device, it conversely reduces the cost of implementation on an IC. As with all bipolar logic, a small current must be drawn from a TTL input to ensure proper logic levels. The total current drawn must be within the capacities of the preceding stage, which limits the number of nodes that can be connected (the fanout). All standardized common TTL circuits operate with a 5-volt power supply. A TTL input signal is defined as low when between 0V and 0.8V with respect to the ground terminal, and high when between 2.2V and 5V (precise logic levels vary slightly between sub-types). TTL outputs are typically restricted to narrower limits of between 0V and 0.4V for a low and between 2.6V and 5V for a high, providing 0.4V of noise immunity. Standardization of the TTL levels was so ubiquitous that complex circuit boards often contained TTL chips made by many different manufacturers selected for availability and cost, compatibility being assured; two circuit board units off the same assembly line on different successive days or weeks might have a different mix of brands of chips in the same positions on the board; repair was possible with chips manufactured years (sometimes over a decade) later than original components. Within usefully broad limits, logic gates could be treated as ideal Boolean devices withou t concern for electrical limitations. Advantages of TTL Logic circuit: Advantages of TTL logic family, one should have a basic idea about RTL, DTL etc. Diode logic (DL) uses diodes to implement logical functions like AND and OR. But the disadvantage is that it can not perform NOT operation. As AND and OR are not complete functions by themselves, they can not perform several logic functions without NOT. Hence, there was a need for some device which can perform a NOT function as diodes can not. That device is a transistor. Then came the DTL which uses a transistor along with diodes. As a transistor can act as an inverter, NAND (NOT-AND) NOR (NOT-OR) operations can be performed. But this logic uses several diodes which will slow down its operation. Due to the delay offered by them, the logic levels may sometimes change i. e. 0 t0 1 or 1 to 0. Then came TTL. This logic uses a multi emitter transistor, a transistor with many emitter terminals. As every emitter is nothing but a diode, this logic eliminates the use of all diodes. This is the major advantage. As transistor becomes ON and OFF much rapidly than a diode, switching time will be faster. TTL, or Transistor-transistor logic replaced resistor-transistor logic, and used much less power. The TTL family is very fast and reliable, and newer faster, less power-consuming, etc. types are always being developed. In TTL (Transistor-Transistor Logic), think that the device using this technology is made from several transistors. Another advantage is that many more chips employ this REFRENCES: www.wikipidia.com www.google.com www.sparnotes.com

Ethics of Human Cloning Essays -- Cloning Argumentative Persuasive Arg

Ethics of Human Cloning    On February 23, 1997 Dolly the lamb was literally made. She is not the work of nature or nature's God but of man, and Englishman, Ian Wilmut, and his fellow scientists. Dolly came into being not only asexually but also as the genetically identical copy of mature ewe, of whom she is a clone. When the startling news was heard throughout the world, there seemed to be substantial debate over the issue since it would open the doors for the possibility of human cloning. Most of the concerns that the opponents have emphasized in the debates have been ethical ones, yet there is not one clear answer to this issue. (McCarthy, 1999, 98) The first effect of the Dolly announcement was to fire the public imagination. Commentators were quick to speculate about the possibility of cloning a human. The Los Angeles Times opined that such a discovery" opens the door to a "blade Runner" world of human replicants. The Wall Street Journal asked business leaders and newsmakers whether they would like to have themselves cloned. Feminists observed that the technique finally made the men superfluous. (Wilder,1999,p180) Even though the cloning of Dolly seems to be unique to the public, yet not in the history of the scientific world. The word "clone" comes from the Greek for twig, and horticulturists have been taking cuttings and growing new plants from them for centuries. The word came into current usage when the renowned British biologist J.B.S. Haldane suggested in 1963 that it would be soon possible to create genetic duplicates of plants, animals, and even humans. The populace has neglected that roughly thirty years ago, it became public that a clutch of tadpoles was cloned in England through a... ...are to Hong Kong." From the government to the scientists, there is no clear answer in what they believe in human cloning, which this paper has showed. Even though I have researched this topic a great deal, I still have not figured out what the public as whole stand is on this issue,    Work Cited Burley, Justine; Harris, John 1999) Human Cloning. Journal of Medical Ethics v25 pg108 Edwords, Fred (1999) How Biotechnology is transforming what we believe in and how we live. Humanist v59 pg23. McCarthy, David (1999) Human Cloning. Journal Of Medical Ethics v25 pg. 98 Miele, Frank (1999) How close are we to cloning time. Skeptic v7 pg48. Wilder, Bruce (1999) From Bastardy to Cloning: Adaptations of Legal Thought for Unorthodox Reproduction. Human Rights Journal of the Section of Individual Rights and Responsibilities v154 p80.

Analysis of Fransisco Goyas “The Third of May”

Francisco Soy's The Third of May 1808 is a responsive painting that was intended to honor those who suffered from the occupation of Napoleons army during the Peninsula War in Spain. This large in x in oil on canvas painting is used to represent the art of Soya, and depict the valor of Spanish revolutionary war. The influences on this piece, as well as its characteristics and influence on later work will be examined. The painting reflects the turmoil during the time period, and contains many aesthetic and emotional qualities that make it relevant in art history; the minting is one of the finest displays of Soy's abilities.Soya who lived from (1746 – 1828) was regarded as one of the most (if not the important Romantic artist. He underwent a major transition in his life that reflected on his work. During his early career he was much more optimistic toward humanity. This optimism is evident in his early artwork that consisted of bright pastel colors (1). In his later work (includi ng the time when The Third of May was being painted) his subject matter became much darker and dejected. This dark subject matter reflectedSoy's physical and mental ailments, his disappointment in the French brutality against the Spanish, and his â€Å"diminished hope for human progress† (3). The story behind The Third of May is one of brutality and malice. After Napoleon invaded Spain, he set his brother in place of the Spanish Monarch. The Spanish people believed the royal family was going to be murdered. In response to these rumors, on May 2, 1808 a rebellion against the French army took place. The French retaliated by rounding up civilians the next day and opening fire (4).After the Spanish regained control in 1814, Soya was motivated to ask the provisional government of Spain to commission The Third of May. He requested to, â€Å"perpetuate by meaner of his brush the most notable and heroic actions of our glorious insurrection against the Tyrant of Europe† (5). Th e painting is in the romantic style. Key characteristics that define this piece as romantic are, â€Å"The sensational current event, loose brushwork, the poses based on reality, the off balance composition, and the dramatic lighting† (6).The fact that it is a raging scene is also characteristic of a painting in the romantic style. Other influences can be noticed in the painting as well. His work is reminiscent of Diego Velasquez because of the rough brush strokes that seem to humanism and revivalist the still figures of the painting (7). There are many characteristics that contribute to the significance of this painting. The placement of the characters is an important feature to notice. The French soldiers are giving the viewer their backs as they fire away in a uniform line.This uniformity portrays the soldiers as intimidating and an organized rower that are in control of the scenario. In contrast the civilians are an unrecognized crown backed up against a hill. This provid es the viewer with a sense of their defenseless and hopeless entrapment. The scale is a grand; prior to romanticism such grandiosity was reserved for religious subject matter. The large scale gave meaning to the murdered Just as religious figures were given importance in previous years. The choice of color and lighting perfectly highlights the heroic, while darkness falls on the wicked.For example the man at the center is in the brightest clothes of allow and white. You can clearly see him as his hands are raised as he faces his death courageously. The emotion of all the civilians is clearly illuminated as death is starring the viewer in the face. The bloodied men on the ground and those who cover their eyes or look away are what personify terror and death. This work so greatly personified martyrdom it influence the work of later artists. Some of the works he influenced were, â€Å"a series by ?dotard Meant, and Pablo Picasso Massacre in Korea and Queering† (8).The later work s that were influenced y him contained a theme of heroism in martyrs, a placement of good facing evil, and numerous other elements. The painting is of great historic significance as well as aesthetic importance. The painting is not merely a historical record but a moment in time in which the viewer can truly feel like they are a part of. Features that make this feeling possible are Soy's placement of the characters, the high contrast between light and dark (or good and evil), and the uncensored death and terror staring at the viewer. This completely defines a hopeless situation.

Interoffice Memo Essay

Yesterday, July 1, 1976, the ruling in the case of Tarasoff v. Regents of the University of California was decided. The Supreme Court of California imposed a legal duty to psychotherapists, enforceable by a civil suit, to warn a person who may become a victim of a violent act by a patient or if the patient threatens to harm themselves. As professionals in the Human Service field it is necessary that we adhere to this when a client may threaten to hurt themselves or another person. With this ruling, and before any action is taken, we are reminded of our code of ethics. Human Service Professionals have guidelines in their responsibility to the client. The ruling of this case has affected our ethical decision making, in that, we also acknowledge that we need to not only assist our client but also, if threat is made, to assist and protect a potential victim. Once this threat is made, ethically, we have no option but to report it and to not do so, we break our code of ethics and the law. This case has made us aware of the fact that threats can and possibly will be carried out, therefore, threats should not and will not be taken lightly. Our Code of Ethics has changed slightly since this ruling was imposed and while we still protect our client’s confidentiality and privacy, there is now an exception. â€Å"If it is suspected that danger or harm may occur to the  client or to others as a result of a client’s behavior, the human service professional acts in an appropriate and professional manner to protect the safety of those individuals. This may involve seeking consultation, supervision, and/or breaking the confidentiality of the relationship.† (Woodside and McClam, 2011) References: Woodside, M., & McClam, T. (2011). An introduction to human services (7th ed.). Belmont, CA: Brooks/Cole Cengage Learning.