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Date: 15-9-2020
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Date: 8-10-2020
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Date: 18-5-2017
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alkenes
An alkene, sometimes called an olefin, is a hydrocarbon that contains a carbon–carbon double bond. Alkenes occur abundantly in nature. Ethylene, for instance, is a plant hormone that induces ripening in fruit, and a-pinene is the major component of turpentine. Life itself would be impossible without such alkenes as b-carotene, a compound that contains 11 double bonds. An orange pigment responsible for the color of carrots, b-carotene is an important dietary source of vitamin A and is thought to offer some protection against certain types of cancer.
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"إنقاص الوزن".. مشروب تقليدي قد يتفوق على حقن "أوزيمبيك"
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الصين تحقق اختراقا بطائرة مسيرة مزودة بالذكاء الاصطناعي
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مكتب السيد السيستاني يعزي أهالي الأحساء بوفاة العلامة الشيخ جواد الدندن
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