Selenium is both an essential trace mineral for human health (supporting thyroid function, DNA synthesis, and protection against oxidative damage) and an open-source framework for automating web browsers for testing. Key dietary sources include Brazil nuts, seafood, and meats. [1, 2, 3, 4, 5, 6]
Selenium (Nutrient/Mineral)
• Health Importance: Acts as a component of selenoproteins, which are critical for reproduction, thyroid hormone metabolism, and fighting infection.
• Recommended Intake: The RDA for adults is 55 micrograms ($\mu g$) daily, with a maximum tolerable upper limit of 400 $\mu g$.
• Deficiency/Excess: Deficiency is rare but can cause health issues, while excessive intake (toxicity) can lead to selenosis.
• Sources: Brazil nuts are the highest source. Others include fish, meat, eggs, and cereals. [1, 3, 7, 8, 9]
Selenium (Software Testing Framework)
• Function: Used for web application testing, browser automation, and regression testing.
• Key Components:
• Selenium WebDriver: Directly communicates with browsers (Chrome, Firefox, Safari, Edge).
• Selenium IDE: A browser extension for recording and playing back tests.
• Selenium Grid: Enables running tests on different machines/browsers simultaneously.
• Features: Open-source, supports multiple languages (Python, Java, C#), and allows cross-browser testing. [5, 6, 10, 11, 12]
This video provides a brief introduction to Selenium's features and components:
Chemistry
• Element: Selenium ($Se$) is a nonmetal (atomic number 34) often found as a byproduct of copper refining.
• Properties: It has photo-conductive properties, making it useful in electronics, glassmaking, and pigments. [13]
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