The Rate Of Diffusion Process - 1515 Words

As an organism increases in its size the surface region to volume ratio decreases over a pobtainable eriod of time. This implies that the living being has a moderately less surface area which allows substances to diffuse through the organism, so the rate of diffusion might not be as fast to meet the prerequisites of a living being. Large multicellular organisms for that reason cannot definitely depend on the diffusion process alone in order for it to source their cells with such substances for example, sustenance and oxygen and to remove waste products. Large multicellular organisms require particualr transport systems as they are certain in its function. The smaller the organism the larger the surface area volume ratio, this provides†¦show more content†¦However, unicellular organism is single celled organisms that can only be dependent on diffusion to move substances in and out of the cells. Whereas its surface area is fairly large compared to the volume of the organism, this means that the nutrients and other substances can easily go through the cell membrane and around its ‘body’. Smaller cells have a substantial surface area compared to cell volume, while larger cells have a diminished proportionof surface area to volume. This is the reason why bacterial cells are so small is that they need a large surface area to cell volume to take in nutrients. Microbes collect nutrients from the environment by diffusion. Single celled organisms such as Euglena, does not need a specialised area to carry out gaseous exchange because they have large surface area to volume ratio (SA:Vol), so the demand for the gases such as O2 and CO2 is low and the body surface area SA enough to meet needs by diffusion. In a large organism diffusion is a net movement of particles from an area of higher concentration to an area of lower concentration. It is a passive process and it doesn’t require energy, whereas Osmosis is the movement of water molecules across a partially permeable membrane from an area of higher water potential to an area of lower water potential. It is a passive process and it doesn’t require energy. Large, active organisms have higher demand for oxygen and removal of waste products such as CO2. They also have small surface area

Killing Reconstruction American Exceptionalism And The...

Killing Reconstruction; American Exceptionalism and The North’s Rise to Power Pulitzer Prize holding biographer of president Woodrow Wilson’s biography, Scott Berg, described the future foreign policy of southern diplomats and federalists such as Wilson, to have been formed by the trauma experienced during the course of The Civil War. The Confederate south was left in a state of constant ruin, with infrastructure and the economy in recession, morale and dignity torn, and in a racial transgression crisis. The presidential election in 1876, was meant to solidify the desired theme of political, economic, and social unity and sustainability in the United States, a supposedly liberated state with respect to the Constitution and legislative†¦show more content†¦An analysis composed by Heather Cox Richardson, Harvard Graduate and professor of history at Boston College, speculates the key reason for deserted Southern reconstruction and integration of black Americans in to the politico-economic order was rooted in the North’s fear of anarchic/Communist ideology enlightening African American workers if industry was established in the south. The events involving foreign affairs and socialist revolutions, primarily in France with the creation of a workers collective, was disconcerting to the industrial corporate sector in the north, whose lobbying and executive precedence was vast but not in favor of the majority of middle class workers*(Independent Document 2). Thus, these fears of Union rule translated into the propagating of the media, sensationalizing the harms of African American integration into the political order, especially in the legislative branch of the federal government, as compromising capitalist industry and implementing state sponsored Communism. Likewise to the previous contention, the 19th century media can be a primary indicator of the cultivated fear implemented through social conditioning. An issue of The New York Times in 1871 described Parisian

Agency Employment Free Essays

Agency employment is where a person is employed as a contract or temporary worker to fill a position in a host company. The agency is the worker’s actual employer and is responsible for payroll and taxes, superannuation, recruitment/dismissal/discipline, workers’ compensation. The host company is responsible for direction of tasks or jobs to be undertaken and determining the work available for the temporary worker on site. We will write a custom essay sample on Agency Employment or any similar topic only for you Order Now Normally there is a joint responsibility in so far as occupational health and safety is concerned. The labour hire situation results in a division of responsibility for the agency employee between the agency and the client. How should common law accommodate this? Should the agency employee be regarded as having a single employer or is there scope to consider join employment or a temporary transfer of employment to the client? The rule at common law is that an employee cannot be transferred by his or her employer to the employment of another person without some act of assent, express or implied, on the employee’s part. The essence of a contract of employment is that it is freely entered into bargain between two parties in which there is the obligation of personal service to the employer. The common law principle that an employee cannot be transferred to a new employer without his or her consent is relevant to the question whether an employee could be transferred temporarily to another employer. Where the agency worker is injured at the client’s workplace, both the client and the agency may be liable to pay damages to the injured worker. The agency can still be liable under both occupational health and safety legislation and at common law. This may be the case even if the agency employee is working on a client’s premises where there may be diminished opportunities to ensure a safe system of work. An additional basis upon which the labour hire company employer can be liable is breach of a non-delegable duty of care. The effect of this principle is that a labour hire company employer remains liable for a negligent failure to provide a safe system of work even if it is the client’s (or some third party’s) negligence which causes the employee’s injuries. Where the injury occurs at the client’s worksite, the client may also be liable as an occupier of premises for failure to take reasonable care for the safety of a lawful entrant. The agency employee may cause injury or damage either to the client or to a third party whilst working for a client. Whilst an employer is vicariously liable for the tortious wrongdoing of an employee within the course of employment, there are additional complications for agency employees and host businesses. How to cite Agency Employment, Papers