Chromosome

Xem 1-20 trên 305 kết quả Chromosome
  • Đề tài: Chromosome (Nhiễm sắc thể) trình bày các nội dung về lịch sử phát hiện; các sinh vật nhân sơ; trong sinh vật nhân chuẩn; số lượng nhiễm sắc thể trong các sinh vật khác nhau; kiểu nhân; sự sai lệch; liên kết ngoài.

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  • Applications of FISH The majority of FISH applications involve hybridization of one or two probes of interest as an adjunctive procedure to conventional chromosomal banding techniques. In this regard, FISH can be utilized to identify specific chromosomes, characterize de novo duplications or deletions, and clarify subtle chromosomal rearrangements. Its greatest utilization, however, is in the detection of microdeletions (see below). Though conventional cytogenetic studies can detect some microdeletions, initial detection and/or confirmation with FISH is essential.

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  • Maternal Age and Trisomy The association between increasing maternal age and trisomy is the most important etiologic factor in congenital chromosomal disorders. Among women under the age of 25, ~2% of all clinically recognized pregnancies are trisomic; by the age of 36, however, this figure increases to 10% and by the age of 42, to 33% (Fig. 63-5). This association between maternal age and trisomy is exerted without respect to race, geography, or socioeconomic factors and likely affects segregation of all chromosomes.

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  • Molecular Cytogenetics The introduction of FISH methodologies in the late 1980s revolutionized the field of cytogenetics. In principle, FISH is similar to other DNA-DNA hybridization methodologies. The probe is labeled with a hapten, such as biotin or digoxigenin, to allow detection with a fluorophore (e.g., FITC or rhodamine). After the hybridization step, the specimen is counter-stained and the preparations are visualized with a fluorescence microscope.

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  • Cytogenetic Testing in Prenatal Diagnosis The vast majority of prenatal diagnostic studies are performed to rule out a chromosomal abnormality, but cells may also be propagated for biochemical studies or molecular analyses of DNA. Three procedures are used to obtain samples for prenatal diagnosis: amniocentesis, chorionic villus sampling (CVS), and fetal blood sampling. Amniocentesis is the most common procedure and is routinely performed at 15–17 weeks of gestation.

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  • Chapter 13 - Chromosomal rearrangements and changes in chromosome number. This chapter presents the following content: Rearrangements of DNA sequences, transposable genetic elements, rearrangements and evolution: a speculative comprehensive example, changes in chromosome number, emergent technologies: beyond the karyotype.

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  • Chromosome segregation in meiosis. A. In meiosis I, each of the 23 pairs of chromosomes finds its "partner," or homologue, and exchanges genetic material (recombines) with it. At metaphase, each homologous pair aligns on the equatorial plate; at anaphase, each member of the homologous pair segregates from its partner. Thus, at the end of meiosis I, each daughter cell contains 23 chromosomes, with each chromosome consisting of two sister chromatids. B. In meiosis II, each chromosome aligns on the metaphase plate, and at anaphase, each of the two sister chromatids divides from the other.

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  • Deletions involving the long arm of chromosome 22 (22q11) are the most common microdeletions identified to date, present in ~1/3000 newborns. VCF syndrome, the most commonly associated syndrome, consists of learning disabilities or mild mental retardation, palatal defects, a hypoplastic aloe nasi and long nose, and congenital heart defects (conotruncal defect).

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  • Chapter 4 - The chromosome theory of inheritance. The main contents of this chapter include all of the following: Chromosomes - The carriers of genes, mitosis: cell division that preserves chromosome number, meiosis: cell divisions that halve chromosome number, gametogenesis, validation of the chromosome theory.

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  • Chapter 12 - The Eukaryotic chromosome. This chapter describes the structure of eukaryotic chromosomes and how that structure affects function. The very long, linear DNA molecules are compacted with proteins in the chromosomes to fit into the nucleus. Several structures are essential for duplication, segregation, and stability.

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  • This book has grown out of the requests by many users of Flora Europaea (Tutin et al., 1964, 1968, 1972, 1976, 1980) for information on the sources of the chromosome numbers cited in that work. During discussions about the publication of these data it became apparent that there is also a demand for a basic checklist of the taxa recognised in the Flora, and that these two requirements could readily be met in the same volume.

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  • DNA is the genetic material of bacteria and viruses, DNA is the genetic material of Eukaryotic cells, DNA is a double helix, Genes code for Proteins...As the main contents of the document "Genes and Chromosomes". Invite you to reference.

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  • Các băng nhiễm sắc (chromosome bands) Bằng kỹ thuật nhuộm cắt băng – nhuộm bằng các chất huỳnh quang hoặc nhuộm màu kết hợp với xử lý bằng enzym hoặc bằng nhiệt sẽ làm xuất hiện các băng trên thể nhiễm sắc. Người ta phân biệt các băng Q, C, G, hoặc R. Sự phân bố của các băng thể hiện đặc tính của từng thể nhiễm sắc trong bộ, cũng như giữa các loài khác nhau.

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  • Genetic information is physically carried on large DNA strings that are organized into chromosomes. Each species is characterized by a chromosome set that carry the information necessary and sufficient for its development and survival. Eukaryotic organisms are mostly diploid, containing two sets of chromosomes with each pair carrying nearly identical genetic information. Occasionally, exceptions to this rule are found, such as haploid yeast (with only one set of chromosomes) or polyploid ferns and frogs (with multiple sets).

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: Commentary on “Genetic linkage and transmission disequilibrium of marker haplotypes at chromosome 1q41 in human systemic lupus erythematosus”, by RR Graham et al...

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Macrogeographic patterns in B-chromosome and inversion polymorphisms of the grasshopper

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: High Chromosome Number in hematological cancer cell lines is a Negative Predictor of Response to the inhibition of Aurora B and C by GSK1070916

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  • This book contains four parts with 16 chapters. Firstly, an optimal stimulation scheme  for  ovaries,  particularly  natural  and  minimal  stimulation  of  ovaries,  has  been  discussed  in  the  first  part.  Then,  one  paper  analyzed  that  how  many  oocytes  per  retrieval will be  the best  for human IVF practice. If one stimulation scheme produces  too  many  eggs,  it  often  results  in  hyperstimulation  syndrome.

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  • Understanding the biological basis of aging has fascinated people throughout recorded history, and is one of the great remaining scientific questions. The question has never been more important than now, as we anticipate the impact that a rapidly growing older population will have on the social, political, and medical landscape over the next 50 years. There is increasing evidence that aging involves damage to the genome, and it is certainly the case that such damage explains much of the coupling of most cancers to aging.

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: Comparison of RBE values of high- LET a-particles for the induction of DNA-DSBs, chromosome aberrations and cell reproductive death...

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