Xem 1-20 trên 29 kết quả Crystal element
  • For millennia people have looked upward to the stars, interpreting patterns, cycles and symbols; and for as long, people have been looking below at birthstones and gemstones. Crystal Astrology unites and maps spiritual truth and guidance with the stars and the Crystal Elements. The power contained in our Crystal Elements enhances our native talents and attributes; it energises our life. “Crystal Astrology” is a completely new phrase in our spiritual vocabulary.

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  • X-ray diffraction is a tool for the investigation of the fine structure of matter. This technique had its beginnings in von Laue's discovery in 1912 that crystals diffract x-rays, the manner of the diffraction revealing the structure of the crystal. At first, x-ray diffraction was used only for the determination of crystal structure.

    pdf524p dontetvui 21-01-2013 14 5   Download

  • By binding to the CArG box sequence, the serum response factor (SRF) activates several muscle-specific genes, as well as genes that respond to mitogens. The core domain of the SRF (core-SRF) binds as a dimer to the CArG box C)5C)4A)3T)2A)1T+1T+2A+3G+4G+5of the c-fos serum response element (SRE fos ).

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  • Long terminal repeats (LTR) of endogenous retroviruses com-prise about 8% of human genome. Typical LTR contains a set of regulatory elements: promoters, enhancers, polyadenilation sites, which can take part in neighbouring genes expression regu-lation.

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  • Sulfur is the element with the largest number of solid allotropes. Most of these consist of unbranched cyclic molecules with ring sizes ranging from 6 to 20. In addition, polymeric allotropes are known which are believed to consist of chains in a random coil or helical conformation. Furthermore, several high-pressure allotropes have been characterized. In this chapter the preparation, crystal structures, physical properties and analysis of these allotropes are discussed.

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  • The 5¢ flanking region of the bile salt export pump (Bsep) gene was systematically analysed to provide the basis for understanding the mechanisms which regulate Bsep transcription. In addition substrates and drugs were investigated for their ability to alter Bsep promoter activity. Bsep promoter function was restricted to hepatocyte derived HepG2 cells. The 5¢ deletional analysis revealed a biphasic shape of reporter gene activities, indicating a suppressive element between nucleotides )800 and )512. ...

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  • Tumour necrosis factor-a(TNF-a) is a key mediator of inflammation in host defence against infection and in autoimmune disease. Its production is controlled post-transcriptionally by multiple RNA-binding proteins that interact with the TNF-aAU-rich element and regulate its expression; one of these is Fragile X mental retardation-related protein 1 (FXR1).

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  • I will discuss experiments which probe the large-scale organization of mitotic chromosomes, using a combination of chemical modifi-cations and micromechanical force measurements. Restriction nucleases cause dissolution of the chromosome, indicating that DNA itself is the contiguous structural element of the chromosome. Therefore the non-DNA (i.e., protein) components must be isolated from one another, suggesting that the mitotic chromosome is best thought of as a network or gel of chromatin.

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  • Cerebral ischemia triggers robust phosphorylation of cAMP response ele-ment-binding protein (CREB) and CRE-mediated gene expression in neu-rons. Glutamate receptor activation and subsequent calcium influx may activate CREB shortly after ischemia.

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  • The moderately thermophilic bacteriumAcidithiobacillus caldus is found in bacterial populations in many bioleaching operations throughout the world. This bac-terium oxidizes elemental sulfur and other reduced inor-ganic sulfur compounds as the sole source of energy. The purpose of this study was to purify and characterize the tetrathionate hydrolase of A. caldus. The enzyme was purified 16.7-fold by one step chromatography using a SP Sepharose column. The purified enzyme resolved into a single band in 10% polyacrylamide gel, both under denaturing and native conditions.

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  • Mitochondrial biogenesis is a complex and highly regulated process that requires the controlled expression of hundreds of genes encoded in two separated genomes, namely the nuclear and mitochondrial genomes. To identify regulatory proteins involved in the transcriptional control of key nuc-lear-encoded mitochondrial genes, we have performed a detailed analysis of the promoter region of theasubunit of the Drosophila melanogasterF1F0 ATP synthase complex.

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  • Salt-inducible kinase-1 (SIK1) is phosphorylated at Ser577 by protein kinase A in adrenocorticotropic hormone-sti-mulated Y1 cells, and the phospho-SIK1 translocates from the nucleus to the cytoplasm. The phospho-SIK1 is dephosphorylated in the cytoplasmand re-enters thenucleus several hours later. By using green-fluorescent protein-tag-ged SIK1 fragments, we found that a peptide region (586– 612) was responsible for the nuclear localization of SIK1. Theregionwas namedtheRK-rich region because of its Arg- and Lys-rich nature. ...

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  • Heat shock factors form a family of transcription factors (four in mam-mals), which were named according to the first discovery of their activation by heat shock. As a result of the universality and robustness of their response to heat shock, the stress-dependent activation of heat shock factor became a ‘paradigm’: by binding to conserved DNA sequences (heat shock elements), heat shock factors trigger the expression of genes encoding heat shock proteins that function as molecular chaperones

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  • Sterol regulatory element-binding proteins (SREBPs) are tightly controlled by various mechanisms, including intracellular localization, protein process-ing, limited proteolysis, post-translational modifications and interaction with associated proteins. Here, I review the regulatory mechanisms of SREBP activity through the interaction with various kinds of protein.

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  • The binding sequences for signal transducer and activator of transcription (STAT) and activator protein 1 have been found in the promoter region of the angiotensinogen gene. We examined whether the elements for activator protein 1 and STAT5B function in angiotensinogen gene activation induced by angiotensin II in vascular smooth muscle cells.

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  • Subunit 4 of cytochromecoxidase (CcO) is a nuclear-encoded regulatory subunit of the terminal complex of the mitochondrial electron transport chain. We have recently discovered an isoform of CcO 4 (CcO4-2) which is specific to lung and trachea, and is induced after birth. The role of CcO as the major cellular oxygen consumer, and the lung-specific expression of CcO4-2, led us to investigate CcO4-2gene regulation.

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  • The serpin plasminogen activator inhibitor-1 (PAI-1) is a fast and specific inhibitor of the plasminogen activating serine proteases tissue-type and urokinase-type plasminogen activator and, as such, an important regulator in turnover of extracellularmatrixand infibrinolysis. PAI-1 spontaneously loses its antiproteolyticactivityby inserting its reactive centre loop (RCL) as strand 4 in b-sheet A, thereby converting to the so-called latent state.

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  • A semiconductor material has a resistivity lying between that of a conductor and that of an insulator. However, in contrast to the granular materials used for resistors, a semiconductor establishes its conduction properties through a complex quantum mechanical behavior within a periodic array of semiconductor atoms, i.e., within a crystalline structure.

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  • The result of two years full-time work by a long-time best-selling author, this book shows you how to implement anything you can imagine with the Canvas 2D API, from text editors to video games. Geary meticulously covers every detail of the API with crystal-clear writing so that you not only understand advanced concepts, but most importantly, you can modify the book's examples for your own specific use cases.

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  • Hydrogenated amorphous silicon, a new form of a common element, is a semiconductor that has come of age. Its scientific attractions include a continuously adjustable band gap, a usable camer lifetime and diffusion length, efficient optical transitions, and the capability of employing either nor p-type dopants. Furthermore, it can be fabricated very easily as a thin film by a technology that not only inherently escapes the expenst: of crystal perfection but also requires significantly smaller amounts of raw materials....

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