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  • 1
    Online Resource
    Online Resource
    Milton :CRC Press LLC,
    Keywords: Gel electrophoresis. ; Electronic books.
    Description / Table of Contents: Through its clear presentation of the basic concepts, Gel Electrophoresis: Nucleic Acids breaks new ground by describing the principles of the technique without resorting to complicated protocols and recipes.
    Type of Medium: Online Resource
    Pages: 1 online resource (190 pages)
    Edition: 1st ed.
    ISBN: 9781000101430
    DDC: 574.87328
    Language: English
    Note: Cover -- Half Title -- Series Page -- Title Page -- Copyright Page -- Table of Contents -- Abbreviations -- Preface -- Acknowledgements -- Part 1: Basic Principles and Methods -- Chapter 1: Introduction: the Variety and Forms of Nucleic Acids -- Overview -- Electrophoresis and the properties of nucleic acids -- The variety and forms of nucleic acid -- References -- Chapter 2: The Theory of Nucleic Acid Electrophoresis -- The movement of nucleic acids in liquids and in gels -- Electric currents and buffer solutions -- Nucleic acids in solution -- Nucleic acids in gels -- The movement of nucleic acids through gels in constant electric fields -- Ogston sieving -- Reptation -- Migration as rigid rods -- The movement of nucleic acids through gels in pulsed electric fields -- References -- Chapter 3: The Electrophoresis of Native and Denatured Nucleic Acids -- The control of base pairing -- Physical and chemical denaturants for nucleic acid gel electrophoresis -- Temperature -- Alkaline conditions -- Methyl mercuric hydroxide, glyoxal and formaldehyde: denaturants for RNA in agarose gels -- Urea and formamide -- The binding of proteins to nucleic acids during gel electrophoresis -- References -- Chapter 4: The Choice of Format: Horizontal or Vertical, Agarose or Polyacrylamide? -- Apparatus for horizontal and vertical gels -- Apparatus for horizontal agarose gels -- Apparatus for vertical polyacrylamide gels -- Power supplies for nucleic acid gel electrophoresis -- Agarose gel media for nucleic acid electrophoresis -- Modified agarose preparations -- Low melting point agarose -- Higher strength agarose -- High-sieving agarose -- Visigel™ -- Ready-made agarose gels -- Polyacrylamide gel media for nucleic acid gel electrophoresis -- Modified polyacrylamide formulations -- Ready-made polyacrylamide gels -- Wedge shaped gels. , Toxicity of the components of polyacrylamide gels -- References -- Chapter 5: The Detection of Nucleic Acids Following Electrophoretic Separation -- Overview -- The principles of nucleic acid detection -- Binding with fluorescent dyes -- Labeling with radioactive nucleotides -- Labeling with fluorescent nucleotides -- Labeling nucleic acids with specific proteins -- Indirect DNA-protein coupling -- Direct DNA-protein coupling -- Conventional staining -- Nucleic acid detection in situ and after transfer to membranes -- Summary of nucleic acid detection methodology -- References -- Part 2: Techniques and Applcations -- Chapter 6: Guide to Techniques and Applications -- Matching the molecule to the technique -- Strategic considerations: avoiding elementary mistakes -- Chapter 7: Nondenaturing Agarose Gel Electrophoresis -- Buffers for nondenaturing agarose gels -- The resolving power of agarose: altering the gel concentration -- altering the field strength -- Estimating the length of unknown fragments using semi-log plots -- Solving a separation problem: resolving the 5148 and 4973 bp bands in the HindIII-EcoRI restriction digest of phage λ DNA -- Alternative methods for staining with ethidium bromide -- Passive diffusion -- can agarose gels be left safely overnight before photography? -- Amounts of DNA: estimating unkown quantities and overloading or underloading the gel -- Estimating unknown quantities -- Overloading and underloading a gel -- DNA conformation and the mobility of molecules in agarose gels -- Heating λ DNA markers -- A note on taking pictures -- Recording the position of marker bands when DNA is transferred to a membrane -- Research applications: overview -- Research application: Nondenaturing agarose gel electrophoresis: Southern blotting -- Background -- Procedure -- Interpretation -- References. , Chapter 8: Denaturing Agarose Gel Electrophoresis -- Research application. Denaturing gel electrophoresis of single-stranded RNA molecules: Northern blotting -- Background -- Procedure -- Interpretation -- References -- Chapter 9: Pulsed Field Agarose Gel Electrophoresis -- The principles of pulsed field technology -- Pulsed field electrode geometry -- Sample preparations for pulsed field gels -- Research application. Pulsed field agarose gels for genome mapping -- Background -- Procedure -- Interpretation -- References -- Chapter 10: Nondenaturing Polyacrylamide Gel Electrophoresis -- Overview -- Research application. High-resolution separation of double-stranded DNA fragments -- Background -- Procedure -- Interpretation -- Single-and double-strand conformational polymorphisms: SSCP and DSCP -- The principle of using gel electrophoretic conformational polymorphisms to detect mutations -- Research application. N ondenaturing polyacrylamide gel electrophoresis: using SSCP analysis to detect mutations -- Bandshift or gel retardation assays -- The principles of the bandshift assay -- Research application. Bandshifting assays -- References -- Chapter 11: Denaturing Polyacrylamide Gel Electrophoresis -- Overview -- DNA sequencing -- The principles of DNA sequencing -- Research application. The use of a dGTP base analog to overcome a sequencing gel compression artifact -- DNA footprinting -- The principle of DNA footprinting -- Research application. DNA footprinting -- RNase protection assays -- The principle of the RNase protection assay -- Research application. RNase protection assay -- Nuclease S1 protection assays -- The principle of nuclease S1 protection assays -- Research application. Nuclease S1 protection assay -- Primer extension assays -- The principle of the primer extension assay -- Research application. Primer extension assays -- References. , Appendices -- Appendix A: Glossary -- Appendix B: Suppliers -- Index.
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  • 2
    Electronic Resource
    Electronic Resource
    Malden, USA : Blackwell Science Inc
    Wound repair and regeneration 11 (2003), S. 0 
    ISSN: 1524-475X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The combination of cultured autologous keratinocytes with the dermal regeneration template Integra™ could offer increased possibilities for reconstructive surgery and wound healing. A single-step application of cells, centrifuged deep into an Integra™-like matrix at the silicone–matrix junction, has been described but might prove technically complex for clinical use. We have investigated the possibility of simplifying this procedure by applying cultured cells directly to the underside of the Integra™ or directly to the wound bed immediately prior to grafting. The objective was to see whether cells would migrate through the matrix in an upward direction. We tested the principle of this concept using a pig wound healing model. Integra™ was seeded directly with cultured cells and grafted onto fresh full-thickness wounds, or unseeded Integra™ was applied to freshly excised wound beds that had just been seeded with the same number of cells. Biopsies were taken at 3, 7, 11, and 14 days. Histological sections showed that the cells moved through the Integra™ to give a confluent surface epithelium. Direct seeding onto the Integra™ was the most efficient method. Transduction of cultured autologous keratinocytes in vitro with a MFGlacZnls retrovirus confirmed that the epidermis was derived from the cultured autologous keratinocytes. (WOUND REP REG 2003;11:132–138)
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Determining the spatial and temporal diversity of photosynthetic processes in forest canopies presents a challenge to the evaluation of biological feedbacks needed for improvement of carbon and climate models. Limited access with portable instrumentation, especially in the outer canopy, makes remote sensing of these processes a priority in experimental ecosystem and climate change research. Here, we describe the application of a new, active, chlorophyll fluorescence measurement system for remote sensing of light use efficiency, based on analysis of laser-induced fluorescence transients (LIFT). We used mature stands of Populus grown at ambient (380 ppm) and elevated CO2 (1220 ppm) in the enclosed agriforests of the Biosphere 2 Laboratory (B2L) to compare parameters of photosynthetic efficiency, photosynthetic electron transport, and dissipation of excess light measured by LIFT and by standard on-the-leaf saturating flash methods using a commercially available pulse-modulated chlorophyll fluorescence instrument (Mini-PAM). We also used LIFT to observe the diel courses of these parameters in leaves of two tropical forest dominants, Inga and Pterocarpus, growing in the enclosed model tropical forest of B2L. Midcanopy leaves of both trees showed the expected relationships among chlorophyll fluorescence-derived photosynthetic parameters in response to sun exposure, but, unusually, both displayed an afternoon increase in nonphotochemical quenching in the shade, which was ascribed to reversible inhibition of photosynthesis at high leaf temperatures in the enclosed canopy. Inga generally showed higher rates of photosynthetic electron transport, but greater afternoon reduction in photosynthetic efficiency. The potential for estimation of the contribution of outer canopy photosynthesis to forest CO2 assimilation, and assessment of its response to environmental stress using remote sensing devices such as LIFT, is briefly discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 207 (1987), S. 517-518 
    ISSN: 1617-4623
    Keywords: Nonsense suppression ; Release factor ; Bacteriophage T4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Nonsense suppression by supE44 has been examined in a collection of 14 T4 gene 22 and gene 23 UAG mutants, for which the precise gene location is known. In concordance with previous studies, UAG followed by a pyrimidine was inefficiently suppressed. However, among positions with similar 3′ nucleotides, there was considerable variation in suppression efficiency. The competition between supE44 and Release Factor 1 (RF1) was also investigated following the introduction of a multicopy RF1 plasmid. An inverse relationship between the efficiency of suppression and RF1 competition was observed.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 213 (1988), S. 144-149 
    ISSN: 1617-4623
    Keywords: Nonsense suppressor ; Release factor ; Noncognate tRNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have compared the competition between strong or weak suppressor tRNAs and translational release factors (RF) at nonsense codons in the lacI gene of Escherichia coli. Using the F'lacIZ fusions developed by Miller and coworkers, UAG, UAA, and UGA codons at positions 189 and 220 were efficiently suppressed by plasmid-borne tRNAtrp suppressors cognate to each nonsense triplet. Introduction of a compatible RF 1 plasmid competed at UAG and UAA but not UGA codons. An RF2 expressing plasmid competed at UAA and UGA but had little effect at UAG. Release factor competition against weak suppressors was measured using combinations of noncognate suppressors and nonsense codons. In each case, release factor plasmids behaved identically towards poorly suppressed codons as they did when the same codons were efficiently suppressed. The implications for these studies on the role of release factors in nonsense suppression context effects are discussed.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1617-4623
    Keywords: Nonsense suppression ; Context effects ; Aminoglycosides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have compared the suppression of nonsense mutations by aminoglycoside antibiotics inEscherichia coli and in human 293 cells. Six nonsense alleles of the chloramphenicol acetyl transferase (cat) gene, in the vector pRSVcat, were suppressed by growth in G418 and paromomycin. Readthrough at UAG, UAA and UGA codons was monitored with enzyme assays for chloramphenicol acetyl transferase (CAT), in stably transformed bacteria and during transient expression from the same plasmid in human 293 tissue culture cells. We have found significant differences in the degree of suppression amongst three UAG codons and two UAA codons in different mRNA contexts. However, the pattern of these effects are not the same in the two organisms. Our data suggest that context effects of nonsense suppression may operate under different rules inE. coli and human cells.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 59 (1996), S. 495-501 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two ab initio (ROHF and MP2), one local (SVWN), four hybrid (BHandH, BHandHLYP, Becke3LYP, and Becke3P86), and two nonlocal (BLYP and BP86) density functional theory (DFT) methods are used for calculating the dissociation energies of molecules that contain H(SINGLE BOND)O, O(SINGLE BOND)O and O(SINGLE BOND)C bonds. The sensitivity to the basis set of the prediction of bond dissociation energies with DFT methods was tested with Becke3LYP on the H(SINGLE BOND)O dissociation energy of water. The 6-31 + G(d) methods are chosen as the smallest basis set which produces reasonable results. The calculated values for all other ab initio and DFT methods were performed with these basis sets and then compared with the experimental data. The suitability of DFT methods for computing reliable bond dissociation energies of oxygen containing molecules is discussed. © 1996 John Wiley & Sons, Inc.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 5 (1994), S. 429-436 
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Low-temperature 1H, 13C, and 119Sn NMR spectroscopic techniques were used to probe the nature of cuprates derived from Me3SnLi, CuCN, or CuBr · Me2S. In THF, addition of Me3SnLi and CuX (X = Br or CN) gives aggregated [Me3SnCu · LiX]n. When the ratio of stannyl anion to cuprous cation is 2 : 1, mixtures of (Me3Sn)3Cu2Li, (Me3Sn)2CuLi · LiX, and (Me3Sn)3CuLi2 are formed. This behavior is unlike either homo trialkylsilycyanocuprates, which form (R3Si)2Cu(CN)Li2 at 2 : 1 ratios of silyl anion to cuprous ion, or mixed trialkylstannyl- or trialkylsilyl-cuprates, which exist as (R3M)Cu(R′)(CN)Li2 (M = Si or Sn and R′ = Me or Bu). (R3Sn)3CuLi2 is the major species when the stannyl anion to cuprous cation ratio reaches 3 : 1. On the other hand, the analogous magnesium cuprates are discrete species in solution and possess differential reactivity.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 2022-05-26
    Description: Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here for personal use, not for redistribution. The definitive version was published in Fuel 191 (2017): 538-554, doi:10.1016/j.fuel.2016.11.081.
    Description: Optimization of crude oil production depends heavily on crude oil composition and its variation within individual reservoirs and across multiple reservoirs. In particular, asphaltene content has an enormous impact on crude oil viscosity and even the economic value of the fluids in the reservoir. Thus, it is highly desirable to understand the primary controls on crude oil composition and asphaltene distributions in reservoirs. Here, a complex oilfield in the North Sea containing six separate reservoirs is addressed. The crude oil is believed to have spilled out of deeper reservoirs into shallower reservoirs during the overall reservoir charging process. Asphaltene content is measured in-situ through downhole fluid analysis and is generally consistent with a spill-fill sequence in reservoir charging. Detailed compositional analysis of crude oil samples by comprehensive two-dimensional gas chromatography (GC×GC) is used to determine the extent and variation among the reservoirs of water washing, biodegradation and thermal maturity. Increased biodegradation and water washing in the shallower reservoirs is consistent with a spill-fill sequence. The water washing is evidently assisted by biodegradation. Moreover, analyses of four thermal maturity biomarkers show that shallower reservoirs contain less mature oil, again consistent with a spill-fill sequence. The combination of DFA for bulk compositional analysis and GC×GC for detailed compositional analysis with geochemical interpretation is an effective tool for unraveling complex oilfield scenarios.
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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  • 10
    Publication Date: 2016-12-17
    Description: Nature Reviews Clinical Oncology 14, 32 (2017). doi:10.1038/nrclinonc.2016.128 Authors: Olga A. Martin, Robin L. Anderson, Kailash Narayan & Michael P. MacManus Despite progressive improvements in the management of patients with locoregionally confined, advanced-stage solid tumours, distant metastasis remains a very common — and usually fatal — mode of failure after attempted curative treatment. Surgery and radiotherapy are the primary curative modalities for these patients, often combined
    Print ISSN: 1759-4774
    Electronic ISSN: 1759-4782
    Topics: Medicine
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