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Date: 8-7-2019
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Date: 22-9-2020
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Date: 28-10-2020
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Some common aromatic hydrocarbons consist of fused benzene rings—rings that share a common side. These compounds are called polycyclic aromatic hydrocarbons (PAHs).
The three examples shown here are colorless, crystalline solids generally obtained from coal tar. Naphthalene has a pungent odor and is used in mothballs. Anthracene is used in the manufacture of certain dyes. Steroids, a large group of naturally occurring substances, contain the phenanthrene structure.
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حقن الذهب في العين.. تقنية جديدة للحفاظ على البصر ؟!
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"عراب الذكاء الاصطناعي" يثير القلق برؤيته حول سيطرة التكنولوجيا على البشرية ؟
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جمعية العميد تعقد اجتماعها الأسبوعي لمناقشة مشاريعها البحثية والعلمية المستقبلية
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