Molecular diffusion

There are various models that describe the passage of molecules across membranes. In order to rule out the effect of the size of the passage, it is assumed that the solutes will be uncharged and spherical. There are size-selective models that are used to analyze experimental data. These models are the one- or two- pore analysis and the normal or lognormal pore distribution modes. Previous analysis has shown that the heteroporous equations had similar results and the homoporous equations were…

The rate of osmosis is affected by temperature. Contrary to the results obtained in this lab, warmer temperatures speed up the rate of osmosis. In our lab, our results showed that the room temperature water was the optimal temperature for osmosis, followed by cold water, then the hot water. The prune in Beaker A, the control group and room temperature water, increased in weight approximately 110%, from an original weight of 6.8 grams. The water in Beaker A also remained the most consistent in…

to be selectively permeable which means that the cell allows only certain objects and substances in and out of the cell (McKinley, O’Loughlin, & Bidle, 2015). Substances are moved across the cell membrane through a process called diffusion. Osmosis is a type of diffusion that involves the movement of water across the cell membrane from an area of low concentration to an area of high concentration (McKinley, O’Loughlin, & Bidle, 2015). There are three types of concentrations of solutes: isotonic,…

STOP stands for social norms, teach, opportunities, protective, and support victims (CDC, 2016). The diffusion of innovation model (DOI) application is used to spread the awareness and education, while implementing strong guidelines to achieve disseminative communication achievable to sustainable reducing SV (CDC, 2016; Glanz, Rimer, & Viswanath, 2008).…

small amount of DNA material is immersed in concentrated solution, cesium chloride (CsCl), and soon after placed in centrifuge until the point where equilibrium is achieved is called density-gradient centrifugation. Contrasting techniques involving diffusion and sedimentation form a persisting CsCl concentration gradient. Furthermore, the concentration gradient and pressure of centrifugal force results in increased density. And when solution density corresponds to the buoyant density, DNA…

educational career, I have accumulated great interest in science and its relations with all aspects of life. Since junior high school, my interest and passion for biology and chemistry has grown stronger as years go by. Studying life processes in molecular terms…

Everybody wants to be a hero, and everyone has what it takes. No, I’m not talking about some ability to grow and become highly skilled or knowledgeable, I’m talking about the ability to obey one’s genes. In horror movies, I find myself constantly wondering why the victim would scream when the killer is right around the corner. Shouldn’t their body, their subconscious, know that it has a better chance of survival if it doesn’t scream? We can thank our species’ progression for that. Over the…

influences the way people react when they see other people reacting. Why do individuals not offer any means of help to a victim when others are present and what are the negative influences by social interactions due to conformity as well as the diffusion of responsibility in a certain situation? Empathy…

Stanley Milgram was a psychologist professor and in June 1961 he wanted to test people’s obedience to authority. John Darley and Bibb Latane were psychologists who wanted to know why people ignore others cries for help. Both these experiments tie into “Lord of the Flies” by William Goulding in my opinion. And both of the experiments are alike and different in many ways. Milgram wanted to test how well we react to leaders, even if they tell us to do bad things that will hurt others. And Darley…

It was 3 AM in New York City and this is the time when the brutal killing of Kitty Genovese. I believe that if her neighbors did not just watch and listen to her cries but if they have called the police i believe that kitty genovese would have been still alive. Kitty Genovese was murdered by a crazed man by the name of Winston Moseley. They say it took 2.5 Minutes for the police to get their and the murder had happen in a time span of 30 minutes and in those 30 minutes the killer had been drawn…