Xem 1-20 trên 174 kết quả Animal cell
  • FC01 CELLS Cells are tiny building blocks that make up all living things. Cells are so small that you need a microscope to see them. ANIMAL CELL This is the control centre of the cell. It contains chromosomes with DNA instructions for all the cell’s activities, including instructions to make new cells. This is a jelly like substance, in which many of the cell’s activities, e.g. respiration and protein synthesis occur. This is a thin skin around the cell. It is selectivelt permeable, controlling what goes in and out of the cell....

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  • Tissue culture was first devised at the beginning of the twentieth century [Harrison, 1907; Carrel, 1912] (Table 1.1) as a method for studying the behavior of animal cells free of systemic variations that might arise in vivo both during normal homeostasis and under the stress of an experiment. As the name implies, the technique was elaborated first with undisaggregated fragments of tissue, and growth was restricted to the migration of cells from the tissue fragment, with occasional mitoses in the outgrowth.

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  • The Science of Animal Agriculture is directed toward teaching the basic science concepts involved in the production of agricultural animals. This newly revised edition contains the latest up-to-date information regarding the scientifi c aspect of the agricultural industry. All facets of modern agriculture are based on science. From the most rudimentary cultural practices to the most complicated biotechnology techniques, scientifi c research has produced the phenomenon known as American agriculture....

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  • All animals digest their food, carry on gas exchange, excrete waste, circulate nutrient and waste products to and from the cells, coordinate their movements, protect themselves, and reproduce and disperse the species. The more complex animals have organ systems to carry out these functions; in simple animals, these functions sometimes are carried out by specialized tissues.

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  • Therefore, ex vivo expansion of BMSCs is required to obtain a sufficient number of transplantable cells. Since BMSCs require several kinds of supportive factors for their growth, it is standard practice to use fetal bovine serum (FBS), while autologous human serum (HS) and pooled allogeneic HS have also been used. It has been suggested that FBS may not be favorable for clinical applications due to the possible risk of contamination (prions, viruses, zoonosis) or immunological reactions against xenogeneic serum antigens (Agata et al., 2009).

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  • Cell membranes act as barriers to most, but not all, molecules. The development of a cell membrane that could allow some materials to pass while constraining the movement of other molecules was a major step in the evolution of the cell. Cell membranes are differentially (or semi-) permeable barriers separating the inner cellular environment from the outer cellular (or external) environment.

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  • PLANT CELLS, UNLIKE ANIMAL CELLS, are surrounded by a relatively thin but mechanically strong cell wall. This wall consists of a complex mixture of polysaccharides and other polymers that are secreted by the cell and are assembled into an organized network linked together by both covalent and noncovalent bonds. Plant cell walls also contain structural proteins, enzymes, phenolic polymers, and other materials that modify the wall’s physical and chemical characteristics.

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  • Excess Capacity of Hematopoietic Stem Cells In the absence of disease, one never runs out of hematopoietic stem cells. Indeed, serial transplantation studies in mice suggest that sufficient stem cells are present to reconstitute several animals in succession, with each animal having normal blood cell production. The fact that allogeneic stem cell transplant recipients also never run out of blood cells in their life span, which can extend for decades, argues that even the limiting numbers of stem cells provided to them are sufficient.

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  • Estrogen acts as a proconvulsant in several animal models of epilepsy, including amygdalal kindling and pentylenetetrazol administration in ovariectomized rats (Hom and Buterbaugh, 1986). Estrogen induces the formation of new excitatory synapses in the CA1 region of the hippocampus; and further, this estrogenic induction involves activation of Nmethyl- Daspartate (NMDA) receptors (McEwen, 2002). Increasing the complexity of hippocampal synaptic density is likely a mechanism for the proconvulsant activity of estrogen.

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  • An increasing amount of expressed sequence tag (EST) and genomic data, predominantly for the cnidarians Acropora, Hydraand Nematostella, reveals that cnidarians have a high genomic complexity, despite being one of the morphologically simplest multicellular animals.

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  • The mammalian natriuretic peptide system, consisting of at least three ligands and three receptors, plays critical roles in health and disease. Exam-ination of genetically engineered animal models has suggested the signifi-cance of the natriuretic peptide system in cardiovascular, renal and skeletal homeostasis.

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  • It is hoped that this little work may assist in the search along the dark path upon which many a poet and—in later times—many an investigator has set his feet. It would not be worthy of us, whom science and technical ability has raised to so high an intellectual position as explorers of Nature in every field—should we neglect anything however trivial, deeming it as beneath our notice. We know so much about all that lies around us: the manner in which the cells build our bodies; how the juices circulate within the plant. We feel Nature to be...

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  • We conduct our business primarily in two studios—in Glendale, California, where we are headquartered, and in Redwood City, California. Our Glendale animation campus, where the majority of our animators and production staff are based, was custom built in 1997. We generally retain the exclusive copyright and other intellectual property rights to all of our projects and characters, other than (i) co-ownership of the copyright and other intellectual property rights (including characters) in and to Flushed Away, which was co-produced with Aardman Animations, Ltd.

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  • Potassium (K + ) is the most abundant inorganic cation in plant cells. Unlike animals, plants lack sodium⁄potassium exchangers. Instead, plant cells have developed unique transport systems for K + accumulation and release.

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  • Biotechnology is the scientific field of studying and applying the most efficient methods and techniques to get useful end-products for the human society by using viable micro-organisms, cells, and tissues of plants or animals, or even certain functional components of their organisms, that are grown in fully controlled conditions to maximize their specific metabolism inside fully automatic bioreactors.

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  • Therefore, the brain hormonal milieu in which exogenous hormones are introduced is markedly different in menopause from that in menstruating women. In the ovariectomized animals, however, the hormonal changes in the animals are abrupt in contrast to the gradual hormonal changes found in the menopausal transition. It might be the concerted lack of estradiol and progesterone that facilitate the seizure susceptibility. Both estradiol and progesterone affect γ-amino butyric acid (GABA) ergic function (Scharfman et al, 2005; Nakumura et al, 2005; Kokate et al, 1994).

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  • Carbohydrate Biotechnology Protocols is aimed at those newcomers who have an interest in the production and use of carbohydrate materials, but have shied away from involvement for lack of detailed descriptions of appropriate methods, including the type of practical hints that may be provided by those skilled in those methods, but that are rarely described in research papers.

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  • This book describes applications in preclinical oncology research by bioluminescence imaging (BLI) with a variety of applications. Chapters describe current methodologies for rapid detection of contaminants using the Milliflex system, and the use of bioluminescence resonance energy transfer (BRET) technology for monitoring physical interactions between proteins in living cells.

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  • Simple machines, such as the club and oar (examples of the lever), are prehistoric. More complex engines using human power, animal power, water power, wind power and even steam power date back to antiquity. Human power was focused by the use of simple engines, such as the capstan, windlass or

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  • Protein tái tổ hợp đã và đang được áp dụng rộng rãi trong lĩnh vực y dược nhằm phòng ngừa và điều trị bệnh. Trong bài báo này, tác giả đã đề cập đến một số dòng tế bào prokaryote và eukaryote hiện đang được sử dụng như những hệ thống biểu hiện nhằm thu protein tái tổ hợp. Mỗi dòng tế bào kể trên có ưu nhược điểm riêng và tùy loại protein tái tổ hợp và mục đích nghiên cứu mà chọn lựa dòng tế bào phù hợp nhất....

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