Concentration

increased concentration of STX on the ion channels during an action potential. The depolarization slope in the action potential became less steep as the concentration of STX increased. Likewise, the slope of repolarization decreased as STX…

BIOL 2401.51501 Instructor Beverly Mitchell October 18, 2015 Abstract This lab will be focused on the movement of water from an area of low to high concentration via osmosis (McKinley, O’Loughlin, & Bidle, 2015). This experiment will be tested on eggs that have had their shells removed and we will see how a couple of solutions of different concentrations will affect the membranes on the eggs. One egg will be placed in 30% sucrose solution and the other in distilled water. The purpose of this…

parts of an aqueous solution, the fluid will flow from the section with the higher osmotic pressure to the section with the lower osmotic pressure (HammelSchlege2005). This happens because the solute molecules diffuse toward the fluid with a lower concentration and the solute molecules drag the water through which they diffuse (HammelSchlege2005). This is important for living organisms because of modern medicine. Osmosis impacts the distribution of nutrients and the release of metabolic wastes…

The synthesis of Aa-g-poly(MAA) involve the optimization of various reaction conditions like initiator concentration, monomer concentration, crosslinker concentration, solvent concentration and pH. After the optimization of various reaction parameters the replications were carried-out in triplicates for the reproducibility of the results and statistical of the results obtained. It was performed using the Statistical Package for Social Science (SPSS) version 10. Statistical results of the…

Concentration Gradient effects the rate of Osmosis in Artificial Cells. During our biology lab we learned all about cells, and to further our understanding we even conducted an experiment with an artificial cell. To start the lesson, we learned the difference between diffusion and osmosis, how concentration gradients affect both. Also how the cell membrane works, how tonicity affects plant and animal cells differently, how dialysis tubing works, and how it acts like a living cell. By the end of…

has a molecular weight of 58.44 g/mol and water has a molecular mass of 18.01 g/mol, this shows that NaCl is a bigger molecule. The chickpeas surface undergoes osmosis, allowing for water and/or salt to move from a higher concentration in the surroundings to a lower concentration into the chickpea. Due to the size of the salt molecule, the chickpea will take in less NaCl molecules compared to water molecules to occupy the same space in the chickpea. Figure 2 is a graph of the normalized M(t)…

of saline solutions in 0%, 1%, 3%, 5% and 7% concentrations for 1800s (±0.3s (human error)) and comparing the initial masses (g±0.01g) with their masses after soaking (g±0.01g). There was an outlier in the 13% mass change of the apple core after soaking in 7% saline solution, as shown in Graph 2. However, this outlier and the general trend of the data support the hypothesis. Graph 1 shows a divergent change in masses of apple cores as the concentration of the saline solution is increased:…

Movement of materials from areas of high concentration to areas of low concentration id diffusion. Osmosis is diffusion of water. Tonicity compares the environment inside of a membrane with the outside. When a membrane bound structure has a higher concentration of water on the outside of the membrane than the inside is hypotonic. Hypertonic is when a membrane bound structure has a higher concentration of water on the inside of the membrane than the outside. When something is isotonic the inside…

solute concentrations affected our model organism the Gallus gallus domesticus. The weight of the G. gallus domesticus egg has a greater decrease in mass when added to a higher concentrated solution than a lower concentrated solution. The data also supported the prediction that the mass of the G. gallus domesticus egg in 10% NaCl will weigh less than the G. gallus domesticus egg in the 1% solution. Diffusion and osmosis play an important role in moving solutes and water from high concentrations…

The iodine lab demonstrated the concept of diffusion, the movement of molecules move from a higher concentration to a low concentration through a semipermeable membrane. In the experiment, we observed a beaker filled with distilled water and Lugol’s iodine solution enter a bag filled with glucose and starch solution through the semipermeable membrane provided by the dialysis tubing. While the beaker remained the same color throughout, the solutions in the bag changed from a clear color to a…