of the cell. An important part of regulating this is passive transport. Passive transport is the movement of materials through membranes without any input of energy. One type of passive transport is diffusion. Passive transport is the diffusion of substances across a membrane. In diffusion‚ molecules will usually move from where the substance is more concentrated to where it is less concentrated. The molecules also tend to spread out in the space they enter just like food coloring in water
Premium Cell wall Diffusion Cell membrane
Diffusion is the process by which a particular phenomenon --- such as a contagious disease‚ a technological innovation or even an idea --- is spread from person to person over a period of space and time. One method of diffusion is known as expansion diffusion‚ which is broken down into three distinct types. Expansion Diffusion * Strictly defined‚ expansion diffusion is the process of spreading something from one place to another in an ever-expanding "snowballing" process. Expansion diffusion
Free Infectious disease Black Death
involving people not helping others in a situation where they are hurt‚when they have been hurt‚ where they are in need of assistance‚ or people witnessing a crime involving someone getting hurt‚ we can refer to them as bystanders‚ or sometimes we can refer it as the bystander effect. This is a common‚ for instance‚ in different parts of the world‚ itś not just here in California‚ itś in so many places‚ but we probably don’t pay so much attention to this situation. This is when different types of situations
Premium Bystander effect Psychology Kitty Genovese
Scientific Paper on Diffusion 2 ABSTRACT The effect of molecular weight on the rate of diffusion was assessed using two tests: the glass tube test and the agar-water gel test. In the glass tube set-up‚ two cotton plugs soaked in two different substances (HCl and NH4OH) were inserted into the two ends of the glass tube. The substance with the lighter molecular weight value (NH4OH‚ M = 35.0459 g/mole) diffused at a faster rate (dAve = 25.8cm)‚ resulting in the formation of a white ring around the
Premium Molecular diffusion Hydrochloric acid Ammonia
and West Asia received outside influences and effectively spread their religions. Economically‚ they interacted with other regions to enhance their societies. Thus‚ the social‚ cultural and economic aspects helped give rise to interaction and diffusion of the civilizations. Both societies emphasized male-dominance‚ but they were structured differently. Women in both regions had little power and were seen as subordinates. The strict patriarchy demonstrates the strength and control of the civilization
Premium Sociology
"Diffusion - How atoms move through solids" Diffusion means mass transport by atomic motion. The mechanisms of Gases & Liquids is known as random (Brownian) motion and for solids is known vacancy diffusion or interstitial diffusion. Simply we can define diffusion as‚ the movement of particles in a solid from an area of high concentration to an area of low concentration‚ resulting in the uniform distribution of the substance. (Diffusion chapter 5‚ 2008‚ p.1) Ronald D. Kriz(1999) suggests that
Free Diffusion Molecular diffusion Atom
The bystander effect is a social psychological phenomenon where individuals are less likely to help a person in need when there are other people present. In the event of a person being sexually harassed or even raped‚ should the bystanders who did nothing to help just as guilty as the one committing the crime? Is the bystander effect still valid if bystanders witnessed the assault first hand? Or are they more likely to intervene? In 1964‚ Kitty Genovese was raped‚ robbed‚ and murdered in her building
Premium Bystander effect Kitty Genovese Psychology
A summary of Diffusion of Innovations Les Robinson Fully revised and rewritten Jan 2009 Diffusion of Innovations seeks to explain how innovations are taken up in a population. An innovation is an idea‚ behaviour‚ or object that is perceived as new by its audience. Diffusion of Innovations offers three valuable insights into the process of social change: - What qualities make an innovation spread successfully. - The importance of peer-peer conversations and peer networks.
Premium Diffusion of innovations Innovation Crossing the Chasm
The effect of molecular weight on the diffusion rates of Potassium permanganate (KMnO4)‚ Potassium dichromate(K2Cr2O7) and Methylene Blue^1 _________________ Group 3 Sec. X-1L February 6‚ 2012 ____________________ ABSTRACT The effect of molecular weight on the diffusion of substances were tested through the use of agar-water gel with three wells placed in a petri dish. Drops of three different substances namely: Potassium
Free Diffusion Molecular diffusion Ammonia
The Effect of Molecular Weight and Time on the Diffusion Rate of Potassium Permanganate‚ Potassium Dichromate‚ and Methylene Blue.1 Arantxa Alex Carpio Group 1 Sec. X – 4L March 24‚ 2015 ABSTRACT The effect of molecular weight and time on the rate of diffusion was determined using the agar-water gel test. A petri dish of agar-water gel with three wells was prepared and a prepared solution of each substance was dropped on each well; one with potassium permanganate (KMnO4)‚
Premium Diffusion Salt Molecule