Xem 1-4 trên 4 kết quả Chromatin packing
  • Phát triển là quá trình kiểm soát sự biểu hiện gen, quá trình điều hòa phức tạp về cơ chế, cơ bản có 5 mức độ: 1- Sự xoắn của NST (Chromatin Packing) 2- Kiểm soát sự phiên mã (Transcriptional Control) 3- Điều hòa hậu phiên mã (Posttranscriptional) [Nhân tế bào (Nuclear levels)] 4- Kiểm soát sự giải mã (Translational Control) 5- Điều hòa hậu giải mã (Posttranslational Control) [Cytosol (Cytoplasmic levels)] Sự điều hòa phiên mã bởi những phân tử protein,yếu tố phiên mã (transcription fact...

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  • Alterations in chromatin packing are not the only physical manifestations of cancer. A cluster of tumour cells will also usually display gross structural changes that pathologists use for diagnosis: cells look visibly deformed and are often enlarged, with swollen and misshapen nuclei; and the chromosomes are distri- buted eccentrically. In an attempt to study these chan- ges more accurately, researchers at ASU’s Biodesign Institute have developed an optical computerized tomography (CT) scan for individual cells.

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  • are there breast cancer cells in your lymph nodes? Your doctor will examine your lymph nodes to see if they contain cancer. Having cancer cells in the lymph nodes under your arm is associated with an increased risk of the cancer spreading. Lymph nodes are filters along the lymph fluid channels. Lymph fluid leaves the breast and eventually goes back into the bloodstream. The lymph nodes try to catch and trap cancer cells before they reach other parts of the body. When lymph nodes are free, or clear, of cancer, the test results are called negative.

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  • In this chapter, students will be able to understand: Chromatin structure is based on successive levels of DNA packing; gene expression can be regulated at any stage, but the key step is transcription; cancer results from genetic changes that affect cell cycle control;...

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