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petri_dish

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author	Yashina Ksenia <ksenia_yashina@kodomo.fbb.msu.ru>
date	Thu, 23 Dec 2010 17:08:18 +0300
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ksenia_yashina@23	1 <head>
ksenia_yashina@23	2 <title>Petri dish</title>
ksenia_yashina@23	3 <meta http-equv="content-type" content="text/html; charset=windows-1251">
ksenia_yashina@23	4 </head>
ksenia_yashina@23	5 <body>
ksenia_yashina@23	6 <h2>Petri dish</h2>
ksenia_yashina@23	7 Simulation of life inside Petri dish, where hypothetic unicellular organisms move and reproduce.
ksenia_yashina@23	8 <br><br>
ksenia_yashina@23	9 <h3>List of terms:</h3>
ksenia_yashina@23	10 <ul>
ksenia_yashina@23	11 <li>Cell - a unit of population, described by location in the dish, velocity and lifespan; can carry and transmit mutation </li>
ksenia_yashina@23	12 <li>Petri dish - area of cells' activity</li>
ksenia_yashina@23	13 <li>Asexual reproduction - division of parent cell, which leads to formation of two identical daughter cells; parent cell disappears; no division occurs if there is not enough space to place daughter cells in dish</li>
ksenia_yashina@23	14 <li>Sexual reproduction - formation of four daughter cells instead of two collided parent cells; occurs with certain probability when cells meet; the probability rises as environment conditions worsen; similarly to asexual reproduction, nothing happens if there's lack of space for daughter cells</li>
ksenia_yashina@23	15 <li>Mutation - cell's property, which is transmitted with 100% probability in asexual reproduction process and with lower probability in sexual reproduction process; is caused by user and appears in random cell of population</li>
ksenia_yashina@23	16 <li>Lifespan - time period between appearance and vanishing of cell from Petri dish</li>
ksenia_yashina@23	17 <li>Environment - condition which influences cells' behaviour, is set by user and measured on scale [0:100] (from the worst conditions to the best)</li>
ksenia_yashina@23	18 <li>Collision - situation when distance between cells' centres is less than given threshold; collision leads either to sexual reproduction or change of cells' velocities (their directions)</li>
ksenia_yashina@23	19 </ul>
ksenia_yashina@23	20
ksenia_yashina@23	21 <h3>Initial parameters:</h3>
ksenia_yashina@23	22 Parameters which are defined before the start of simulation. They can't be changed while simulation is in progress
ksenia_yashina@23	23 <pre>
ksenia_yashina@23	24 Number of cells [1-10] - number of cells in dish at start of simulation
ksenia_yashina@23	25 Diameter of Petri dish [100-500] - defines the size of Petri dish
ksenia_yashina@23	26 Cell's lifetime [1-1000] - defines period of cell's life in dish
ksenia_yashina@23	27 Asexual(sexual) reproduction (on/off) - activates or disables chosen type of reproduction
ksenia_yashina@23	28 </pre>
ksenia_yashina@23	29 When you press "Submit" button, simulation is launched. After that this button is replaced by "Stop" button, which can stop the simulation at any time.<br>
ksenia_yashina@23	30 Once there are no cells in dish left, the simulation stop automatically.
ksenia_yashina@23	31 <br>
ksenia_yashina@23	32 <h3>Changeable parameters:</h3>
ksenia_yashina@23	33 Parameters which can be changed at any time
ksenia_yashina@23	34 <pre>
ksenia_yashina@23	35 Environment [1-100] - influences on probability of cell's sexual reproduction
ksenia_yashina@23	36 </pre>
ksenia_yashina@23	37 In addition, by pressing "Add mutation" button you add mutation to living population.
ksenia_yashina@23	38 <br><br>
ksenia_yashina@23	39 <h3>Statistics:</h3>
ksenia_yashina@23	40 When "Show statistics" button is pressed, a window appears with information about:
ksenia_yashina@23	41 <ul>
ksenia_yashina@23	42 <li>values of initial parameters</li>
ksenia_yashina@23	43 <li>total number of cells - number of all cells which lived in dish during the whole time of simulation</li>
ksenia_yashina@23	44 <li>maximum number of cells in dish (at one time)</li>
ksenia_yashina@23	45 <li>maximum number of cells in dish (at one time)</li>
ksenia_yashina@23	46 <li>total number of mutated cells - number of all mutated cells which lived in dish</li>
ksenia_yashina@23	47 <li>number of asexual/sexual reproduction events</li>
ksenia_yashina@23	48 </ul>
ksenia_yashina@23	49 </body>