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  • Oxford University Press  (129)
  • Cambridge University Press  (59)
  • American Association for the Advancement of Science (AAAS)  (39)
  • 2005-2009  (147)
  • 1985-1989  (72)
  • 1960-1964  (8)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Cambridge : Cambridge University Press
    The @British journal for the history of science 22 (1989), S. 401-418 
    ISSN: 0007-0874
    Source: Cambridge Journals Digital Archives
    Topics: History , Natural Sciences in General
    Notes: Wallace became a full-time naturalist in 1848, the year when he and Bates set out on their journey to South America. Wallace was twenty-five at the time and over half of his life had been spent in various parts of Wales, the land of his birth. Commentators have tended to gloss over or ignore any formative influences from this early period of his life or even to dismiss them as non-existent. This is surprising as it was during the eight or so years in Wales leading up to 1848 that Wallace's interest in natural history emerged. ‘The importance of this early period in Wallace's life can scarcely be over-emphasized’ wrote Durant in his account of the development of the Wallace personality, but he omitted any specific reference to the significance of the early period in Wales. Those seeking a simple unitary cause for Wallace's conversion to natural history usually locate this in his visit to Leicester in 1844 and his meeting there with H. W. Bates. ‘The odyssey began ... in 1844, in Leicester’ wrote Brooks, adding that ‘the more remote parts of ... southern Wales had offered little reading material...’ This, and similar claims, are presumably founded primarily on Wallace's belief—expressed sixty years later—that it was at Leicester that he first familiarized himself with Malthus' Essay on the Principles of Population and Humboldt's Personal Narrative of Travels in South America. There is, however, evidence that Wallace was probably familiar with at least one of these books some time before his visit to Leicester and that it was during his period in southern Wales that his interest in natural history emerged and developed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Cambridge : Cambridge University Press
    Science in context 2 (1988), S. 59-75 
    ISSN: 0269-8897
    Source: Cambridge Journals Digital Archives
    Topics: History , Natural Sciences in General
    Notes: The ArgumentMany inventors, engineers, and scientists think in verbal images. Elmer Sperry (1860–1930), a noted American inventor, was able to “operate” in his mind's eye the machines he was developing. For inventors, engineers, and experimental scientists, visualization is often followed by construction of a physical model of the invention, which can be an experimental apparatus. The model, or apparatus, is then tested in increasingly complex environments and changes are made in the physical artifact until it is ready to be used. Examples of this process of development are Sperry's development of a ship stabilizer for the U.S. Navy and a revolving mirror to be used by Albert Michelson in the determination of the speed of light. Thomas Edison called experimentation his development of an invention through the building and testing of a series of models. So, both scientists and inventors experiment. They are not discovering the “secrets of nature”: they are observing how artifacts – their physical creations – behave. These physical models of thought reflect the characteristics of the tools with which they were made. They are socially constructed, as well.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Cambridge : Cambridge University Press
    The @journal of modern African studies 2 (1964), S. 137-139 
    ISSN: 0022-278X
    Source: Cambridge Journals Digital Archives
    Topics: Ethnic Sciences , History , Political Science , Economics
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2007-09-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Meyer, D A -- Kwiat, P G -- Hughes, R J -- Bucksbaum, P H -- Ahn, J -- Weinacht, T C -- New York, N.Y. -- Science. 2000 Sep 1;289(5484):1431a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17839509" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 1988-11-25
    Description: The evolution of worker behavior in the social insects is usually explained by kin selection: although workers do not produce offspring, they do reproduce their genes by aiding the reproduction of relatives. The most difficult case for kin selection theory would be species in which workers are fully capable of reproducing but instead opt to rear brood of low relatedness. These conditions are perhaps best fulfilled by the swarm-founding wasps because they have little caste differentiation and their colonies usually have multiple queens, which should lower relatedness. Estimates of within-colony relatedness for three species in this group confirm that it is sometimes (but not always) very low. Inbreeding is negligible in these species, so the hypothesis that inbreeding may raise relatedness is not supported. The maintenance of worker behavior in such species is a significant challenge for kin selection theory.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Queller, D C -- Strassmann, J E -- Hughes, C R -- New York, N.Y. -- Science. 1988 Nov 25;242(4882):1155-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17799732" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 1989-11-03
    Description: A complementary DNA (cDNA) for ubiquitin carboxyl-terminal hydrolase isozyme L3 was cloned from human B cells. The cDNA encodes a protein of 230 amino acids with a molecular mass of 26.182 daltons. The human protein is very similar to the bovine homolog, with only three amino acids differing in over 100 residues compared. The amino acid sequence deduced from the cDNA was 54% identical to that of the neuron-specific protein PGP 9.5. Purification of bovine PGP 9.5 confirmed that it is also a ubiquitin carboxyl-terminal hydrolase. These results suggest that a family of such related proteins exists and that their expression is tissue-specific.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilkinson, K D -- Lee, K M -- Deshpande, S -- Duerksen-Hughes, P -- Boss, J M -- Pohl, J -- New York, N.Y. -- Science. 1989 Nov 3;246(4930):670-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2530630" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; B-Lymphocytes/enzymology ; Base Sequence ; Cattle ; DNA/genetics ; Humans ; Isoenzymes/genetics ; Molecular Sequence Data ; Neuropeptides/*genetics/isolation & purification ; Sequence Homology, Nucleic Acid ; Thiolester Hydrolases/*genetics/isolation & purification ; Ubiquitin Thiolesterase
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2006-05-27
    Description: We describe a pathogenetic mechanism underlying a variant form of the inherited blood disorder alpha thalassemia. Association studies of affected individuals from Melanesia localized the disease trait to the telomeric region of human chromosome 16, which includes the alpha-globin gene cluster, but no molecular defects were detected by conventional approaches. After resequencing and using a combination of chromatin immunoprecipitation and expression analysis on a tiled oligonucleotide array, we identified a gain-of-function regulatory single-nucleotide polymorphism (rSNP) in a nongenic region between the alpha-globin genes and their upstream regulatory elements. The rSNP creates a new promoterlike element that interferes with normal activation of all downstream alpha-like globin genes. Thus, our work illustrates a strategy for distinguishing between neutral and functionally important rSNPs, and it also identifies a pathogenetic mechanism that could potentially underlie other genetic diseases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉De Gobbi, Marco -- Viprakasit, Vip -- Hughes, Jim R -- Fisher, Chris -- Buckle, Veronica J -- Ayyub, Helena -- Gibbons, Richard J -- Vernimmen, Douglas -- Yoshinaga, Yuko -- de Jong, Pieter -- Cheng, Jan-Fang -- Rubin, Edward M -- Wood, William G -- Bowden, Don -- Higgs, Douglas R -- MC_U137961143/Medical Research Council/United Kingdom -- MC_U137961145/Medical Research Council/United Kingdom -- MC_U137961147/Medical Research Council/United Kingdom -- New York, N.Y. -- Science. 2006 May 26;312(5777):1215-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Medical Research Council Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, OX3 9DS, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16728641" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Cells, Cultured ; Chromatin Immunoprecipitation ; Chromosomes, Human, Pair 16/*genetics ; Erythroblasts ; GATA1 Transcription Factor/metabolism ; Gene Expression ; Gene Expression Profiling ; Globins/*genetics ; Haplotypes ; Humans ; Melanesia ; Minisatellite Repeats ; Multigene Family ; Oligonucleotide Array Sequence Analysis ; *Polymorphism, Single Nucleotide ; *Promoter Regions, Genetic ; Regulatory Elements, Transcriptional ; Transcription, Genetic ; alpha-Thalassemia/*genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2006-04-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mann, Michael E -- Hughes, Malcolm K -- New York, N.Y. -- Science. 2006 Apr 28;312(5773):528-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16645077" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2006-12-16
    Description: We show that the quantum spin Hall (QSH) effect, a state of matter with topological properties distinct from those of conventional insulators, can be realized in mercury telluride-cadmium telluride semiconductor quantum wells. When the thickness of the quantum well is varied, the electronic state changes from a normal to an "inverted" type at a critical thickness d(c). We show that this transition is a topological quantum phase transition between a conventional insulating phase and a phase exhibiting the QSH effect with a single pair of helical edge states. We also discuss methods for experimental detection of the QSH effect.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bernevig, B Andrei -- Hughes, Taylor L -- Zhang, Shou-Cheng -- New York, N.Y. -- Science. 2006 Dec 15;314(5806):1757-61.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Stanford University, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17170299" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2007-10-27
    Description: The melanocortin 1 receptor (MC1R) regulates pigmentation in humans and other vertebrates. Variants of MC1R with reduced function are associated with pale skin color and red hair in humans of primarily European origin. We amplified and sequenced a fragment of the MC1R gene (mc1r) from two Neanderthal remains. Both specimens have a mutation that was not found in approximately 3700 modern humans analyzed. Functional analyses show that this variant reduces MC1R activity to a level that alters hair and/or skin pigmentation in humans. The impaired activity of this variant suggests that Neanderthals varied in pigmentation levels, potentially on the scale observed in modern humans. Our data suggest that inactive MC1R variants evolved independently in both modern humans and Neanderthals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lalueza-Fox, Carles -- Rompler, Holger -- Caramelli, David -- Staubert, Claudia -- Catalano, Giulio -- Hughes, David -- Rohland, Nadin -- Pilli, Elena -- Longo, Laura -- Condemi, Silvana -- de la Rasilla, Marco -- Fortea, Javier -- Rosas, Antonio -- Stoneking, Mark -- Schoneberg, Torsten -- Bertranpetit, Jaume -- Hofreiter, Michael -- New York, N.Y. -- Science. 2007 Nov 30;318(5855):1453-5. Epub 2007 Oct 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departament de Biologia Animal, Universitat de Barcelona, Spain. clalueza@ub.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17962522" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Substitution ; Animals ; Biological Evolution ; Cell Line ; DNA/genetics ; *Fossils ; Hair Color/*genetics ; Hominidae/*genetics ; Humans ; Molecular Sequence Data ; *Mutation ; Polymerase Chain Reaction ; Receptor, Melanocortin, Type 1/chemistry/*genetics/metabolism ; Sequence Analysis, DNA ; Skin Pigmentation/*genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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