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زیست شناسی سلولی و مولکولی - غشــــــا سلولی
 
درباره وبلاگ


"و اذاسَئَلَكَ عِبادی عَنّی فَاِنّی قَریب اُجیبُ دَعوَةَ الدّاعِ اِذا دَعان فَلیستَجیبُوالی وَ لیؤمِنُوا بی لَعَلَّهُم یرشُدُون"

*********************
ای ستاره ها که از جهان دور
چشمتان به چشم بی فروغ ماست
نامی از زمین و از بشر شنیده اید؟
در میان آبی زلال آسمان
موج دود و خون و اتشی ندیده اید؟
ای ستاره ما سلام مان بهانه است
عشقمان دروغ جاودانه است
در زمین زبان حق بریده اند!!
حق زبان تازیانه است
وانکه با تو صادقانه درد دل کند
های های گریه ی شبانه است!
ای ستاره ای ستاره غریب
ما اگر زخاطر خدا نرفته ایم
پس چرا به داد ما نمی رسد؟
ما صدای گریمان به آسمان رسید
از خدا چرا صدا نمی رسد....؟؟؟؟

***********************

"خدایا دستمو گرفتی.........
رها نکن!"

مدیر وبلاگ : چکاوک ...
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آمار وبلاگ
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زیست شناسی سلولی و مولکولی
"حکمت وزیدن باد رقصاندن شاخه ها نیست امتحان ریشه هاست..."امام علی ع




بعد از دیواره در سلول ها بدون توجه به پروکاریوت یا یوکاریوت بودن،غشا سلولی وجود دارد.در سلول های یوکاریوت بسیاری از کارها به اندامک محول شده اما در پروکاریوت ها بر عهده ی غشا است.غشا از پروتئین-قند و لیپید ساخته شده و بر خلاف دیگر ساختار ها حالت سیال دارد این ویژگی باعث ایجاد یکی از مهمترین نظریه ها ی زیست شناسی یعنی نظریه "موزاییک سیال" در سال 1980توسط سینجر و نیکلسون شد.سیالیت غشا وابسته به سیالیت لیپید ها و ان هم به دوعامل بستگی دارد:درجه اشباع بودن زنجیره هی هیدروکربنی و دمای محیط.غشا در عین حال که سیال است به طور کامل انسجام دارد

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وظایف گوناگونی در سلول بر عهده ی غشاست از جمله تراوایی کاملا اختصاصی،یعنی کنترل عبور و مرو مواد به طور کاملا دقیق.

یکی از وظایف مهم غشا که رای عام بسیار جالب است این می باشد که غشا سلول تحت اثر یکی از قوانین انتشار-اسمز و انتقال اجازه عبور مواد را به یکی از حالات زیر می دهد:

 

1.uniport:تنها جابجا شدن مواد از یک سمت به سمت دیگر

 

2.symport:یک ماده به واسطه ماده ی دیگر جابجا می شود مثل گلوکز که فقط به کمک گره فسفات می تواند از پروتئین های غشا عبور کند.

 

3.antiport:جابجایی ها عکس هم رخ دهند و به طور کاملا هم زمان به طوری که روی هم اثر میگذارند مثل پمپ سدیم و پتاسیم موجود در سلول های عصبی

 

                  

 

باید توجه داشت که محل اثر بعضی از انتی بیوتیک ها غشا می باشد.به همین خاطر باید مراقب اثرات مستقیم و غیر مستقیم انها بود.از دیگر اجراء سلول های باکتریایی که بسیار هائز اهمیت اند کپسول و اسپور می باشد برای مطالعه مطالب مناسب در باره ان میتوانید به این ادرس مراجعه کنید.

http://olom-azmayeshgah.mihanblog.com





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سه شنبه 13 مهر 1389 :: نویسنده : چکاوک ...
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