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آخرین اخبار وب سایت

بیماری سلیاک چیست ؟

  بیماری سلیاک چیست ؟ سلیاک چیست؟ بیماری سلیاک، نوعی بیماری گوارشی است که به پرزهای روده کوچک آسیب می‌رساند و سبب اختلال در جذب مواد مغذی می‌شود. افرادی که به بیماری سلیاک مبتلا هستند پروتئینی به نام گلوتن را که در گندم، جو، چاودار و احتمالاً جودو سر وجود دارد، نمی‌توانند تحمل کنند. زمانی […]


بیماری های لثه

  بیماری های لثه راه پیشگیری از بیماریهای لثه چیست؟ تنها راه پیشگیری از بیماری های لثه رعایت مناسب بهداشت و حذف پلاک میکروبی از سطح دندانهاست. البته مراجعه منظم به دندانپزشک هم اهمیت زیادی در پیشگیری ازبیماریهای لثه دارد.  لطفا جهت دیدن متن کامل به ادامه مطالب مراجعه نمایید.


یونجه؛ سلطان گیاهان دارویی

  یونجه؛ سلطان گیاهان دارویی گیاه یونجه را به دلیل دارا بودن انواع ویتامین‌ها، مواد معدنی و پروتئین‌ها سلطان گیاهان می‌نامند. یونجه، گیاهی است غریب که امروزه در اذهان عمومی تنها به درد علوفه دام می‌خورد، درحالی‌که در گذشته استفاده‌های فراوان از این گیاه پرفایده می‌شده است.این گیاه که عمدتاً در آسیا کشت می‌شود از […]


System Test a2
بازديد : 301 views iconدسته: NoName

Petroleum (L. petroleum, from early 15c. “petroleum, rock oil” (mid-14c. in Anglo-French), from Medieval Latin petroleum, from Latin: petra: “rock” + oleum: “oil”.[1][2][3]) is a naturally occurring, yellow-to-black liquid found in geological formations beneath the Earth‘s surface, which is commonly refined into various types of fuels.

It consists of hydrocarbons of various molecular weights and other organic compounds.[4] The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that are made up of refined crude oil. A fossil fuel, petroleum is formed when large quantities of dead organisms, usually zooplankton and algae, are buried underneath sedimentary rock and subjected to both intense heat and pressure.

Petroleum has mostly been recovered by oil drilling, (natural petroleum springs are rare). This comes after the studies of structural geology (at the reservoir scale), sedimentary basin analysis, reservoir characterization (mainly in terms of the porosity and permeability of geologic reservoir structures).[5][6] It is refined and separated, most easily by distillation, into a large number of consumer products, from gasoline (petrol) and kerosene to asphalt and chemical reagents used to make plastics and pharmaceuticals.[7] Petroleum is used in manufacturing a wide variety of materials,[8] and it is estimated that the world consumes about 90 million barrels each day.

Concern over the depletion of the earth’s finite reserves of oil, and the effect this would have on a society dependent on it, is a concept known as peak oil. The use of fossil fuels, such as petroleum, has a negative impact on Earth’s biosphere, damaging ecosystems through events such as oil spills and releasing a range of pollutants into the air including ground-level ozone and sulfur dioxidefrom sulfur impurities in fossil fuels. The burning of fossil fuels plays a contributory role in the current episode of global warming.


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System Test a1
بازديد : 264 views iconدسته: NoName

Petroleum (L. petroleum, from early 15c. “petroleum, rock oil” (mid-14c. in Anglo-French), from Medieval Latin petroleum, from Latin: petra: “rock” + oleum: “oil”.[1][2][3]) is a naturally occurring, yellow-to-black liquid found in geological formations beneath the Earth‘s surface, which is commonly refined into various types of fuels.

It consists of hydrocarbons of various molecular weights and other organic compounds.[4] The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that are made up of refined crude oil. A fossil fuel, petroleum is formed when large quantities of dead organisms, usually zooplankton and algae, are buried underneath sedimentary rock and subjected to both intense heat and pressure.

Petroleum has mostly been recovered by oil drilling, (natural petroleum springs are rare). This comes after the studies of structural geology (at the reservoir scale), sedimentary basin analysis, reservoir characterization (mainly in terms of the porosity and permeability of geologic reservoir structures).[5][6] It is refined and separated, most easily by distillation, into a large number of consumer products, from gasoline (petrol) and kerosene to asphalt and chemical reagents used to make plastics and pharmaceuticals.[7] Petroleum is used in manufacturing a wide variety of materials,[8] and it is estimated that the world consumes about 90 million barrels each day.

Concern over the depletion of the earth’s finite reserves of oil, and the effect this would have on a society dependent on it, is a concept known as peak oil. The use of fossil fuels, such as petroleum, has a negative impact on Earth’s biosphere, damaging ecosystems through events such as oil spills and releasing a range of pollutants into the air including ground-level ozone and sulfur dioxidefrom sulfur impurities in fossil fuels. The burning of fossil fuels plays a contributory role in the current episode of global warming.


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