Factory selling ASTM A193 B7 All Threaded Rods Threaded Bars for Ukraine Factories

ASTM A193/A193M B7 All Threaded Rods All Threaded Bars API Flange Valve Wellhead All Thread Stud Bolts Alloy steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications. Standard: IFI-136, DIN975 Inch Size: 1/4”-4” with various lengths Metric Size: M6-M100 with various lengths Other Available Grade: ASTM A193/A193M B7, B7M, B16 B8 Class 1 & 2, B8M Class 1 & 2, ASTM A320/A320M L7, L7M, L43, B8 Class 1 & 2, B8M Class 1 & 2, and so on. Finish: Plain, Black Oxide, Zinc Plated, Zinc Nickel Plated, Cadmium Plated, PTFE etc. Packing: Bulk about 25 kgs each carton, 36 cartons each pallet Advantage: High Quality and Strict Quality Control, Competitive Price,Timely Delivery; Technical Support, Supply Test Reports Please feel free to contact us for more details.

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    Principles of Evolution, Ecology and Behavior (EEB 122)

    The lecture presents an overview of evolutionary biology and its two major components, microevolution and macroevolution. The idea of evolution goes back before Darwin, although Darwin thought of natural selection. Evolution is driven by natural selection, the correlation between organism traits and reproductive success, as well as random drift. The history of life goes back approximately 3.7 billion years to a common ancestor, and is marked with key events that affect all life.

    00:00 – Chapter 1. Introduction
    03:22 – Chapter 2. History of Evolutionary Studies
    15:59 – Chapter 3. Conditions for Natural Selection
    21:25 – Chapter 4. The Power of Selection and Adaptation
    27:09 – Chapter 5. Drift
    31:10 – Chapter 6. History of Life
    39:33 – Chapter 7. Conclusion

    Complete course materials are available at the Open Yale Courses website: https://open.yale.edu/courses

    This course was recorded in Spring 2009.



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