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  • 1
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    Holocene and 'Little Ice Age' glacial activity in the Marbore Cirque, Monte Perdido Massif, Central Spanish Pyrenees (2014)
    Sage
    In: Holocene
    Details
    Publication Date: 2014-10-17
    Description: The Marboré Cirque, which is located in the southern Central Pyrenees on the north face of the Monte Perdido Peak (42°40'0''N; 0.5°0''W; 3355 m), contains a wide variety of Holocene glacial and periglacial deposits, and those from the ‘Little Ice Age’ (‘LIA’) are particularly well developed. Based on geomorphological mapping, cosmogenic exposure dating and previous studies of lacustrine sediment cores, the different deposits were dated and a sequence of geomorphological and paleoenvironmental events was established as follows: (1) The Marboré Cirque was at least partially deglaciated before 12.7 kyr BP. (2) Some ice masses are likely to have persisted in the Early Holocene, although their moraines were destroyed by the advance of glaciers during the Mid Holocene and ‘LIA’. (3) A glacial expansion occurred during the Mid Holocene (5.1 ± 0.1 kyr), represented by a large push moraine that enclosed a unique ice mass at the foot of the Monte Perdido Massif. (4) A melting phase occurred at approximately 3.4 ± 0.2 and 2.5 ± 0.1 kyr (Bronze/Iron Ages) after one of the most important glacial advances of the Neoglacial period. (5) Another glacial expansion occurred during the Dark Age Cold Period (1.4–1.2 kyr), followed by a melting period during the Medieval Climate Anomaly. (6) The ‘LIA’ represented a clear stage of glacial expansion within the Marboré Cirque. Two different pulses of glaciation were detected, separated by a short retraction. The first pulse occurred most likely during the late 17th century or early 18th century (Maunder Minimum), whereas the second occurred between 1790 and ad 1830 (Dalton Minimum). A strong deglaciation process has affected the Marboré Cirque glaciers since the middle of the 19th century. (7) A large rock avalanche occurred during the Mid Holocene, leaving a chaotic deposit that was previously considered to be a Late Glacial moraine.
    Print ISSN: 0959-6836
    Electronic ISSN: 1477-0911
    Topics: Geography , Geosciences
    Published by Sage
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  • 2
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    Beta-adrenergic-receptor localization by light microscopic autoradiography (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-06-20
    Description: beta-Receptors were identified in rat brain by a light microscopic autoradiographic technique. The procedure involved binding 3H-labeled dihydroalprenolol to beta-receptors in intact slide-mounted tissue sections and generating autoradiograms by the apposition of emulsion-coated cover slips, Biochemical analysis of the binding indicated that these conditions provided a high degree of selective labeling of beta-receptors. High densities of receptors were found in superficial layers of the cerebral cortex, throughout the caudate-putamen, in the periventricular nucleus of the thalamus, in the molecular layer of the cerebellum, and in other areas. These results are in agreement with other electrophysiological and histochemical data. This radiohistochemical approach should be an important addition to other methods for mapping functional catecholamine neuronal pathways and sites of hormonal action.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Palacios, J M -- Kuhar, M J -- New York, N.Y. -- Science. 1980 Jun 20;208(4450):1378-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6246585" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Autoradiography/*methods ; *Brain Chemistry ; Cerebellum/metabolism ; Cerebral Cortex/metabolism ; Corpus Striatum/metabolism ; Dihydroalprenolol/metabolism ; Hippocampus/metabolism ; Microscopy ; Norepinephrine/metabolism ; Rats ; Receptors, Adrenergic/*analysis ; Receptors, Adrenergic, beta/*analysis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
    Electronic Resource
    Electronic Resource
    Iron catalytic precursors in dry coal hydroconversion (1994)
    s.l. : American Chemical Society
    Energy & fuels 8 (1994), S. 94-98 
    Details
    ISSN: 1520-5029
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ef00043a016
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  • 4
    Electronic Resource
    Electronic Resource
    Distribution of Serotonin Receptors (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 600 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb16871.x
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  • 5
    Electronic Resource
    Electronic Resource
    Micro Correspondence (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 9 (1993), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: HupK, a hydrogenase-ancillary protein from Rhizobium leguminosarum, shares structural motifs with the large subunit of NiFe hydrogenases and could be a scaffolding protein for hydrogenase metal cofactor assembly
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1993.tb01260.x
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  • 6
    Electronic Resource
    Electronic Resource
    Steps in the formation of monodispersed TiO2 particles (1988)
    Springer
    Journal of materials science 7 (1988), S. 671-672 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730331
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  • 7
    Electronic Resource
    Electronic Resource
    The hydrogenase gene cluster ofRhizobium leguminosarum bv.viciae contains an additional gene (hypX), which encodes a protein with sequence similarity to the N10-formyltetrahydrofolate-dependent enzyme family and is required for nickel-dependent hydrogenase processing and activity (1996)
    Springer
    Molecular genetics and genomics 252 (1996), S. 237-248 
    Details
    ISSN: 1617-4623
    Keywords: Hydrogenase ; Rhizobium leguminosarum bvviciae ; N10-formyl ; tetrahydrofolate ; hypX ; Nickel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plasmid pAL618 contains the genetic determinants for H2 uptake (hup) fromRhizobium leguminosarum bv.viciae, including a cluster of 17 genes namedhupSLCDEFGHIJK-hypABFCDE. A 1.7-kb segment of insert DNA located downstream ofhypE has now been sequenced, thus completing the sequence of the 20 441-bp insert DNA in plasmid pAL618. An open reading frame (designatedhypX) encoding a protein with a calculated Mr of 62 300 that exhibits extensive sequence similarity with HoxX fromAlcaligenes eutrophus (52% identity) andBradyrhizobium japonicum (57% identity) was identified 10 bp downstream ofhypE. Nodule bacteroids produced byhypX mutants in pea (Pisum sativum L.) plants grown at optimal nickel concentrations (100 µM) for hydrogenase expression, exhibited less than 5% of the wild-type levels of hydrogenase activity. These bacteroids contained wild-type levels of mRNA from hydrogenase structural genes (hupSL) but accumulated large amounts of the immature form of HupL protein. The Hup-deficient mutants were complemented for normal hydrogenase activity and nickel-dependent maturation of HupL by ahypX gene provided in trans. From expression analysis ofhypX-lacZ fusion genes, it appears thathypX gene is transcribed from the FnrN-dependenthyp promoter, thus placinghypX in thehyp operon (hypBFCDEX). Comparisons of the HypX/HoxX sequences with those in databases provided unexpected insights into their function in hydrogenase synthesis. Similarities were restricted to two distinct regions in the HypX/HoxX sequences. Region I, corresponding to a sequence conserved in N10-formyltetrahydrofolate-dependent enzymes involved in transferring one-carbon units (C1), was located in the N-terminal half of the protein, whereas region II, corresponding to a sequence conserved in enzymes of the enoyl-CoA hydratase/isomerase-family, was located in the C-terminal half. These similarities strongly suggest that HypX/HoxX have dual functions: binding of the C1 donor N10-formyl-tetrahydrofolate and transfer of the C1 to an unknown substrate, and catalysis of a reaction involving polarization of the C=O bond of an X-CO-SCoA substrate. These results also suggest the involvement of a small organic molecule, possibly synthesized with the participation of an X-CO-SCoA precursor and of formyl groups, in the synthesis of the metal-containing active centre of hydrogenase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173769
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  • 8
    Electronic Resource
    Electronic Resource
    Distribution of histamine in 7 brain regions in different species and strains of mammals (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 791-793 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen En las especies estudiadas el hipotálamo es la región mas rica en histamina (HT). En la rata, la mayor proporción de HT se localiza en el sedimento de los homogenizados en medio isotónico centrifugados a 105×g; la proporción de HT en el sedimento varia ampliamente de una región a otra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946288
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  • 9
    Electronic Resource
    Electronic Resource
    Neurobiology: Dopamine receptor disputes (1986)
    [s.l.] : Nature Publishing Group
    Nature 323 (1986), S. 205-205 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] 'ESTABLISHED' ideas have a difficult time in neurobiology. Once again one of them, the question of the localization of dopa-mine receptors in the terminals of cortical neurones projecting to the striatum, is contested in a paper by J.M. Trugman et al in this issue (Nature 323, 267; 1986). Brain ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/323205a0
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  • 10
    Electronic Resource
    Electronic Resource
    “In vitro” biofilm formation by Penicillum frequentans strains on sandstone, granite, and limestone (1993)
    Springer
    Applied microbiology and biotechnology 40 (1993), S. 408-415 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The appearance of crusts or patinas on surfaces of stone monuments are indicative signs of weathering. In many cases, microorganisms are mainly responsible for stone decay, giving rise to the formation of characteristic biodeteriorative patinas, called biofilms. In the present work, “in vitro” biofilm formation on sandstone, limestone, and granite block samples by Penicillium frequentans strains isolated from two Spanish cathedrals is demonstrated. Spore suspensions of P. frequentans strains were inoculated on each block sample of unaltered stone material cited above. Biofilms of 1–2 mm thickness were formed on each of the three rock samples, and analysed by means of Fourier-transform infrared spectroscopy, scanning electron microscopy and X-ray mapping (energy-dispersive X-ray spectrometry, KEVEX system). In the three cases, biofilms were principally composed of: fungal mycelium, mineral particles released from the stony substratum, and newly formed organic salts such as oxalate and citrate. These biofilms enhance and accelerate the deteriorative process of rocks due to the loss of stone material (biopitting and mineral grains captured by mycelium) and to alteration of the mineral crystalline networks (cation release by organic acids).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170402
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