четверг, 31 марта 2011 г.

Games

Games


AstroGrav 1.9.1 - Study motion of astronomical objects and interaction with gravity.. (Shareware)

Posted: 31 Mar 2011 02:46 AM PDT



AstroGrav is a software program that allows you to study how astronomical objects move and interact under the force of gravity. It features superb interactive 3D graphics which allow you to move around within an astronomical system that you are viewing, while watching how it evolves with the passage of time.

A wide variety of sample files are provided, including Solar System, space mission, and abstract systems, and these enable you to experiment with AstroGrav without having to go to the trouble of entering your own data. The comprehensive editing facilities allow you to either create your own astronomical systems, or to modify existing ones, and provide you with an almost endless scope for experimentation and investigation.

AstroGrav can be used to visualize and understand the following aspects of gravitational and astronomical systems.

  • Basic concepts of mass, position, velocity, acceleration, force, momentum, and energy.
  • Kepler's Laws of Planetary Motion and Newton's Law of Universal Gravitation.
  • Many body systems and the n-body problem.
  • Orbits and Lagrange points.
  • Interchange of potential energy and kinetic energy in gravitational systems.
  • Projectiles and escape velocities.
  • Gravitational slingshots used in space missions.

AstroGrav calculates how astronomical objects move according to Newton's Law of Universal Gravitation, and displays the results as they are calculated so that you can watch the system evolve as in a movie. AstroGrav is very accurate, dynamically calculates orbits as a system evolves, deals correctly with object collisions, and can cope simultaneously with objects on many different timescales.

AstroGrav is ideal for any of the following.

  • Astronomers interested in studying the evolution of gravitational systems.
  • Teachers and educationalists seeking to deliver courses on math, physics, or astronomy.
  • Students of math, physics, or astronomy.
  • Anyone else interested in studying how objects move and interact under the force of gravity.


Version 1.9.1:
  • includes a correction to a serious fault that caused version 1.9 of AstroGrav to crash during startup for a small proportion of users upgrading from version 1.8.4 or earlier.
  • The symbols for elements (a, e, i, omega, etc) have been added to object windows, the object editor, and the new family editor, in order to make it clearer which element is which.
  • Separators have been added to the lists of units in popup menus to separate units into groups of SI units, imperial units, astronomical units, etc.
  • A bug has been fixed in the Edit / Add Family... command that incorrectly allowed a separator to be selected in the popup menu of the Quick Setup box.
  • Minor corrections have been made to the notes of the Spiral Arms sample simulation.
  • Several corrections have been made to the capitalization of units.


Mac OS X 10.4 or later.

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Mahjong Mac In Poculis 4.1 - Mahjong game with over 120 levels.. (Free)

Posted: 31 Mar 2011 02:29 AM PDT



Mahjong In Poculis is the ultimate Mahjong game with 300 layouts and 6 fun themes: Christmas, Halloween, Asian, Easter, Wonderland and Future. This game is definitely designed for the mahjong lovers, and for those who enjoy challenging memorization and have a sharp eye. The visuals are fun and it is very user friendly. Start your solitaire mahjong fun by finding matching mahjong pieces amongst the plethora, and clicking them to get them off the screen. All of the mahjong pieces can be cleared, but it takes some discipline, strategy, and a little bit of luck to get the 5 medals of each theme.

Version 4.1:
  • [Bug fix]: functionality to publish a part of your Expert scores now works again again (thanks to Madeleine from Canada who reported the bug).


Mac OS X 10.4.11 or later

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Marine Drugs, Vol. 9, Pages 543-560: First Evidence of Palytoxin and 42-Hydroxy-palytoxin in the Marine Cyanobacterium Trichodesmium

Posted: 31 Mar 2011 12:00 AM PDT

Marine pelagic diazotrophic cyanobacteria of the genus Trichodesmium (Oscillatoriales) are widespread throughout the tropics and subtropics, and are particularly common in the waters of New Caledonia. Blooms of Trichodesmium are suspected to be a potential source of toxins in the ciguatera food chain and were previously reported to contain several types of paralyzing toxins. The toxicity of water-soluble extracts of Trichodesmium spp. were analyzed by mouse bioassay and Neuroblastoma assay and their toxic compounds characterized using liquid chromatography coupled with tandem mass spectrometry techniques. Here, we report the first identification of palytoxin and one of its derivatives, 42-hydroxy-palytoxin, in field samples of Trichodesmium collected in the New Caledonian lagoon. The possible role played by Trichodesmium blooms in the development of clupeotoxism, this human intoxication following the ingestion of plankton-eating fish and classically associated with Ostreopsis blooms, is also discussed.