MODELING LEACHATE MIGRATION FROM A LANDFILL December‚ 2003 1 INTRODUCTION A two-dimensional‚ steady state transport modeling using MODFLOW/CTRAN was carried out following the particle tracking calculations to simulate potential contamination for leachate migration from Gibraltar landfill. Gibraltar landfill was a disposal waste site in Bogotá (Colombia) until 1988. The site presented problems related to contamination for leachate migration after its closure‚ since the operation
Premium Aquifer Anaerobic digestion Hydrology
concentrations. II. Background Information Osmosis is one of the four methods of moving particles across membranes along with simple diffusion‚ facilitated diffusion‚ and active transport. Water is able to move in and out of most cells freely. Sometimes the number of water molecules moving in and out is the same and there is no net movement‚ but at other times the molecular movement from one direction exceeds the movement from other direction and creates a net movement. This net movement is called osmosis
Premium Osmosis Chemistry Concentration
LAB EXERCISE: Diffusion and Osmosis Laboratory Objectives After completing this lab topic‚ you should be able to: 1. Describe the mechanism of diffusion at the molecular level. 2. List several factors that influence the rate of diffusion. 3. Explain why diffusion is important to cells. 4. Describe a selectively permeable membrane‚ and explain its role in osmosis. 5. Define hypotonic‚ hypertonic‚ and isotonic in terms of relative concentrations of osmotically active substances. 6. Discuss
Premium Protein Enzyme Cell
120-902 Grand Valley State University 1 Campus Drive Allendale‚ MI 49401 mcraeal@mail.gvsu.edu Abstract In this study‚ we tested the validity of osmosis in artificial animal cells. Osmosis is the diffusion of free water across a membrane. The purpose of the study was to calculate the rate of osmosis in artificial cells containing different concentrations of sucrose and water. We studied the rate of osmosis in artificial cells by creating five different
Premium Concentration Semipermeable membrane Osmosis
Experimental Laboratory Report: An investigation into the rate of osmosis Liana Gohery - 98332250 12/12/2014 Word count - ………3000……….. 1. Abstract This study was conducted to investigate the effect of concentration gradients on the rate of osmosis. Osmosis is the cellular transport of water‚ this study was conducted to show the significance of the rate at which this occurs. Dialysis bags were filled with three different concentrations of sucrose solutions and two with water. They were
Premium Osmosis Diffusion Chemistry
AP BIOLOGY CELL UNIT ACTIVITY #5 NAME_____________________ DATE___________HOUR_____ CELL TRANSPORT MEMBRANE PROPERTIES PASSIVE TRANSPORT CHARACTERISTICS: DIFFUSION: Cell Unit Activity #5 page 1 OSMOSIS : ISOTONIC ANIMAL CELLS Cell Unit Activity #5 page 2 HYPOTONIC HYPERTONIC PLANT CELLS OSMOREGULATION – ADAPTATIONS Paramecium Fresh Water Bony Fish FACILITATED D IFFUSION: Cell Unit Activity #5 page 3 Marine Bony Fish ACTIVE TRANSPORT CHARACTERISTICS:
Premium Membrane biology Osmosis Diffusion
concentration gradient on the diffusion rate. It was hypothesized that the greater the stronger the concentration gradient‚ the faster the rate of diffusion would be. To test this‚ dialysis tubes were submerged in different concentration fructose solutions. We weighed the tubes at specific time intervals to measure the rate of diffusion of water in each different solution. The results illustrated that increased concentration gradient increases the rate of diffusion of water in the tubes. We concluded
Premium Osmosis Concentration Diffusion
References 6 2. MOLECULAR DIFFUSION 7–73 2.1 Concentration‚ Velocity and Flux 8 2.2 Fick’s Law 11 2.3 Steady State Molecular Diffusion through a Constant Area in a Binary Gas Mixture 14 2.4 Multicomponent Diffusion 30 2.5 Gas-Phase Diffusion Coefficient: Measurement and Prediction 36 2.6 Molecular Diffusion in Liquids 42 2.7 Diffusion through a Variable Area 48 2.8 Knudsen Diffusion‚ Surface Diffusion and Self-Diffusion 57 2.9 Applications of the Principles of Molecular Diffusion 59 Notations
Premium Chemical engineering Diffusion Separation process
held together with covalent bonds involving single‚ double‚ and/or triple bonds‚ where a "bond" is a shared pair of electrons (the other method of bonding between atoms is called ionic bonding and involves a positive cation and a negative anion). Molecular geometries can be specified in terms of bond lengths‚ bond angles and torsional angles. The bond length is defined to be the average distance between the centers of two atoms bonded together in any given molecule. A bond angle is the angle formed
Premium Volume
Investigating the Relationship between Cell Size and Rate of Diffusion Ban Madi 11 Dp Biology SL Research Question: How does the size of the cell affect its efficiency in exchanging substances through several ways‚ like diffusion? Aim: To plan and carry out an investigation to show the relationship between volume/Cm3‚ surface area‚ and diffusion using agar cubes measured in time/s; and to demonstrate‚ using diffusion‚ why the size of cells is limited‚ keeping the room temperature
Premium Volume Cell wall Surface area