ABSTRACT Cryopreservation is a method of stabilizing the condition of someone who is terminally ill so that they can be transported to the medical care facilities that will be available in the late 21st or 22nd century. There is little dispute that the condition of a person stored at the temperature of liquid nitrogen is stable, but the process of freezing inflicts a level of damage which cannot be reversed by current medical technology. Whether or not the damage inflicted by current methods can ever be reversed depends both on the level of damage and the ultimate limits of future medical technology. The failure to reverse freezing injury with current methods does not imply that it can never be reversed in the future, just as the inability to build a personal computer in did not imply that such machines would never be economically built.
However when observing the rate of osmosis between hours, there was a vague pattern of decreased osmotic activity as the concentration of sucrose was increased.
The results varied as the 0. However in contrast to these results, only 3 of the 5 solutions examined decrease their percentage of change in mass.
These results completely disproved the theory that the change in mass for the second 24 hours measured will mirror the pattern which the first 24 hours showed.
One similarity which all the results displayed was that the percentage of mass gained in the second 24 hours recorded decreased, concluding that the rate of osmosis does slow over time. This display of random results in the second 24 hours was due to experimental error in uncontrollable variables such as changes in temperature and humidity.
This biological theory which the gain or loss of mass in the potato cores can be linked to is osmosis. Osmosis is the movement of the water from one side of the semi-permeable membrane of the potato cell to the other, caused by the concentration of sucrose.
It was hypothesised that as the concentration increased the mass which the potato gained would decrease due to the larger sucrose molecules preventing the water from crossing the membrane.
This statement is correct however it contains weak links to the theory of osmosis. However the results show differently. They show that when a potato is submerged in a solution of either 2.
From graphing these results, a linear forecast line was drawn to find where, according to these results, the x-intercept was; allowing the concentration of sucrose of the potato cell to be found.
The graph indicates a negative gradient and that the approximate concentration of sucrose inside the potatoes cells was 1. From this discovery it can be concluded that the concentration of sucrose in which the potato would not gain nor lose any mass would be at 1. If the concentration of sucrose in the external fluid was any greater, the potato will lose mass as water will be osmosing out of the cell in an effort to reach equilibrium with the surrounding environment.
This error was improved as cutting the potatoes manually with a knife was replace with cutting the potatoes with a cork borer to ensure all cores had the same dimensions.
Immediately after that issue, it was discovered that 20mL of sucrose solution was not enough to completely cover the three potato cores that were being examined.
It was concluded that it was best to increase the solution level to mL and also decrease the amount of potato cores in each solution to two 2 rather than three 3. This ensured that each potatoes surface area was exposed to the same amount of sucrose solution to assure that the most accurate results will be reached.
Another point for improvement which could be argued as an error is how the potatoes were measured — based on weight rather than size. Although the diameter and circumference were the same on all potato cores, the density of each individual potato core will vary.Transforming media into collaborative spaces with video, voice, and text commenting.
Abstract. Natural cells have been explored as drug carriers for a long period. They have received growing interest as a promising drug delivery system (DDS) until recently along with the development of biology and medical science. Processes (ISSN ; CODEN: PROCCO) is an international peer-reviewed open access journal on processes in chemistry, biochemistry, biology, materials, and related process/systems engineering research fields.
The journal is the publication partner of Systems and Control Division of the Canadian Society for Chemical barnweddingvt.com CSChE S&C Division is a partner of Processes and its. A novel forward (direct) osmosis (FO) desalination process is presented. The process uses an ammonium bicarbonate draw solution to extract water from a saline feed water across a semi-permeable polymeric membrane.
Sample Abstract On Osmosis And Diffusion. The Effects of Osmosis and Diffusion The experimentation of last week’s lab was in order to test the many effects of diffusion and osmosis amongst four experiments. One such experiment was testing the effects of molecular weight on diffusion in relation to the use of Agar.
The methods performed included the use of two acids, HCl and acetic acid. Mindy Wu Period 2 February 17, Lab 1- Osmosis and Diffusion Abstract In this lab three different experiments were. performed. For experiment 1A, the purpose of the experiment was to determine the direction of diffusion of small molecules.1/5(2).