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زیست شناسی سلولی و مولکولی - نظریه 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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زیست شناسی سلولی و مولکولی
"حکمت وزیدن باد رقصاندن شاخه ها نیست امتحان ریشه هاست..."امام علی ع




 مفاهیم کلی و اساسی زیست شناسی نظریه ی "سلولی"است که بر بنای ان:همه ی موجودات زنده(جانوران-گیاهان-تک سلولی ها)از سلول و فراورده های فعالیت سلول ها تشکیل شده اند.این نظریه با پژوهش های متعدد که در ابتدای قرن نوزدهم توسط پژوهشگرانی چون: میربل-اوکن-لامارک-دوترشه-تروپن انجام شد،شکل گرفت و در نهایت منجر به مطالعات شیلایدن گیاهشناس و شوان جانورشناس گردید که نظریه سلولی را به صورت مشخصی ارائه کردند.نظریه سلولی تاثیر زیادی بر همه ی زمینه های تحقیقاتی زیستی داشته است،به طوری که بلافاصله پس از طرح ان،مشخص شده که هر سلول از تقسیم سلولی قبل از خود به وجود می اید.با پیشرفت علم بیوشیمی نشان داده شد که شباهت های اساسی در ترکیب شیمیایی و فعالیت های سوخت و سازی همه ی سلو ل ها وجود دارد و فعالیت جاندار روی هم رفته نتیجه ی مجموع فعالیت و اعمال متقابل واحد های سلولی سازنده است.

به دنبال شکل گیری این نظریه ها و مفاهیم اساسی ،دانش سلول شناسی پیشرفت سریعی نمود.تغییراتی که ضمن تقسیم سلولی در هسته روی میدهد توجه تعدا زیادی از پژوهشگران را به خود جلب کرد به عنوان مثال پدیده ی تقسیم مستقیم توسط رماک و تقسیم غیر مستقیم توسط فیلیمینگ در جانداران و توسط استراسبورگر در گیاهان کشف شد.ایت تقسم در 1878 به وسیله ی شلیشر،کاریوکینز نامیده شد.والدیر مشخص کرد که اساس میتوز عبارت از تشکیل رشته های هسته ای یاکروموزوم ها و توزیع متساوی انها بین دو هسته سلول های دختر ایجاد شده میباشد.

 





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سه شنبه 6 مهر 1389 :: نویسنده : چکاوک ...
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