ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

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Isolation, Purification, and Characterization of Lipase Isoenzymes from a Technical Aspergillus niger Enzyme (1985)

HÖFELMANN, M. ; HARTMANN, J. ; ZINK, A. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Journal of food science 50 (1985), S. 0

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ISSN: 1750-3841

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology

Notes: A qualitative screening revealed the occurrence of lipase, esterase, protease, amylase, endo-1,4-β-D-glucanase, xylanase, pectinmethylesterase, polygalacturonase, catalase, β-D-glucosidase and β-D-galactosidase activities in the technical Aspergillus niger enzyme under study (Lipase 2212 D, Röhm). The isolation and purification of lipolytic activities were performed by combination of DEAE-Trisacryl M ion exchange chromatography, Sephadex G 50 gel filtration and hydrophobic chromatography using Phenylsepharose CL-4B. The individual purification steps were checked by specific enzyme visualization in ultrathin agar gels after ultrathin-layer isoelectric focusing (UIEF). Two UIEF homogeneous lipase isoenzymes (I and II) were isolated and characterized by the following parameters: isoelectric points (I: 4.0; II. 3.5); molecular weights (I: 31000 daltons; II: 19000 daltons); carbohydrate contents (I: 6%; II: 9%) and compositions; pH optima (I, II: 5-6); substrate specificities and various effectors.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-2621.1985.tb10574.x

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2

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Fecundity of whitefish (Coregonus lavaretus) during the eu-and oligotrophication of Lake Constance (1993)

Hartmann, J. ; Quoss, H.

Oxford, UK : Blackwell Publishing Ltd

Journal of fish biology 43 (1993), S. 0

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ISSN: 1095-8649

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: About 20 ovaries of the whitefish ‘Blaufelchen’ (Coregonus lavaretus L.) of Lake Constance (Bodensee) were collected annually from 1964-1991. Absolute and relative fecundity peaked in the early 1980s, lagging about 2 years behind the maximum of total-P in the water (during the circulation period). Out of the biological time-series of Lake Constance, whitefish fecundity is the only one known to follow the phosphorus curve, and this may be the first time-series documented case of parallel trend reversal in the trophic state of a lake and fish biology. It is concluded that fish fecundity serves, at best, as an unspecific monitor of the overall well-being of the fish.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb00412.x

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3

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Crustal structure of the Lofoten continental margin, off northern Norway, from ocean-bottom seismographic studies (1995)

Kodaira, S. ; Goldschmidt-Rokita, A. ; Hartmann, J. M. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Geophysical journal international 121 (1995), S. 0

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ISSN: 1365-246X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: In 1988, an extensive geophysical experiment was performed on the Lofoten passive continental margin, which was formed by the continental break-up between Greenland and northern Norway at 58 Ma. The geological units of the outer Lofoten margin are characterized by seaward-dipping reflectors (SDRs) and landward flood basalt, which extends up to 100 km landwards of SDRs. In this study, we obtain the P-wave velocity structure beneath the Lofoten Basin, the SDRs, and the landward flood basalt by use of ocean-bottom seismograph refraction profiling, and we also discuss the formation of the northern Norwegian passive continental margin.In the Lofoten Basin the crust is of oceanic type, consisting of sedimentary layers, oceanic laver 2 (4.9−5.5 km s−1), layer 3A (6.3−6.8 km s−1) and layer 3B (7.0−7.1 km s−1). Beneath the SDRs the crustal layers are identical to those of the Lofoten Basin, but the thickness of the lower crust, which represents the same velocity as layer 3B, increases to 5 km towards the continent side, and a high-velocity lower crustal layer (7.3 km s−1) is formed at the base of the crust. The ocean-continent transition zone is situated between the landward side of the SDRs and the northward continuation of the Vøring Plateau Escarpment. In this region the velocity of the lower crust gradually decreases and approaches the lower crustal velocity beneath the Lofoten Islands (6.8 km s−1). The model also indicates that the high-velocity layer disappears in this region. Comparing our model with the crustal structure on the Vøring margin, it is clear that the lower crustal body (≥7 km s−1) thickens southwards along the northern Norwegian continental margin. Recent results from petrological and geophysical studies of the generation of the oceanic crust have shown that increasing the temperature of the upwelling asthenospheric material increases the thickness of the oceanic crust. We interpret this as that the oceanic crust in the southern area in the Vøring-Lofoten margin was generated by hotter material than that of the northern area.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb06447.x

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4

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Distribution of parvalbumin isotypes in adult snook and their potential applications as species-specific biomarkers (1997)

Ross, C. ; Tilghman, R. W. ; Hartmann, J. X. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Journal of fish biology 51 (1997), S. 0

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ISSN: 1095-8649

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The highly stable Ca2+ binding protein, parvalbumin, is prevalent in fish white muscle tissue. The properties of this protein make it a promising antigen for use as a specific biomarker for fish identification. Parvalbumin was purified from white muscle of an adult common snook Centropomus undecimalis using ammonium sulfate precipitation, size-exclusion chromatography (SEC) and anion-exchange HPLC. Parvalbumins were characterized by the presence of an 11-kDa band following gradient-SDS gel electrophoresis and by their immunoreactivity against mouse anti-parvalbumin antibodies. Anion-exchange chromatography of the parvalbumin fraction separated from the SEC column yielded nine fractions. Subsequent analysis of these fractions by isoelectric focusing gel electrophoresis led to a total of seven parvalbumin isotypes, which may lend themselves as biomarkers in fish identification. The presence of these seven parvalbumin isotypes was confirmed independently by reversed-phase HPLC. A dilution endpoint immunoassay was developed for C. undecimalis parvalbumin using a monoclonal antibody directed against its highly conserved calcium binding site. The utility of parvalbumin isotype distribution and specific monoclonal antibodies against fish parvalbumin in species identification is discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01512.x

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Numerical simulations of amethyst geode cavity formation by ballooning of altered Paraná volcanic rocks, South America (2012)

L. A. HARTMANN, J. T. N. MEDEIROS, L. T. PETRUZZELLIS

Wiley

In: Geofluids

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Publication Date: 2012-04-15

Description: Numerical modelling by finite element methods provides two significant insights into the formation of the giant amethyst geodes of the Paraná volcanic province: the conditions needed to open the cavities and the conditions that control their size and shape. Giant amethyst geodes were formed in the Cretaceous (135 Ma) in altered volcanic rocks by water vapour pressure (Δp) at about 0.5 MPa under an altered basalt cover of 5–20 m. Only rocks with Young’s modulus values (E) in the range 1–2 GPa can sustain ballooning, which is the growth of a cavity in a ductile medium by the pressure of water and its vapour. The size of the proto-geode is dependent on the water vapour pressure, which is directly related to thickness of the overlying basalt. Varying the yield points causes the formation of either prolate or oblate cavities. A low transition point (smaller than 0.18 MPa) generates a prolate-shaped cavity, whereas a high transition point (larger than 0.18 MPa) generates oblate proto-geodes. Proto-geodes are smaller when Young’s modulus is higher (rock is less altered) or when water vapour pressure is lower (because of thinner overburden of basalt). The calculations are an indication that the processes operative in the altered basalts led to the opening of giant cavities by ballooning.

Print ISSN: 1468-8115

Electronic ISSN: 1468-8123

Topics: Geosciences

Published by Wiley

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Electrical Excitation of Surface Plasmons by an Individual Carbon Nanotube Transistor (2013)

P. Rai, N. Hartmann, J. Berthelot, J. Arocas, G. Colas des Francs, A. Hartschuh, and A. Bouhelier

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-07-12

Description: Author(s): P. Rai, N. Hartmann, J. Berthelot, J. Arocas, G. Colas des Francs, A. Hartschuh, and A. Bouhelier We demonstrate here the realization of an integrated, electrically driven, source of surface plasmon polaritons. Light-emitting individual single-walled carbon nanotube field effect transistors were fabricated in a plasmonic-ready platform. The devices were operated at ambient conditions to act as a... [Phys. Rev. Lett. 111, 026804] Published Thu Jul 11, 2013

Keywords: Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Electronic ISSN: 1079-7114

Topics: Physics

Published by American Physical Society (APS)

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A review of CO2 and associated carbon dynamics in headwater streams: a global perspective (2017)

A. Marx, J. Dusek, J. Jankovec, M. Sanda, T. Vogel, R. Geldern, J. Hartmann, J. A. C. Barth

Wiley

In: Reviews of Geophysics

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Publication Date: 2017-06-01

Description: Terrestrial carbon export via inland aquatic systems is a key process in the global carbon cycle. It includes loss of carbon to the atmosphere via outgassing from rivers, lakes or reservoirs and carbon fixation in the water column as well as in sediments. This review focuses on headwater streams that are important because their stream biogeochemistry directly reflects carbon input from soils and groundwaters that becomes superimposed by additional inputs further downstream. Major drivers of carbon dioxide partial pressures ( p CO 2 ) in streams and mechanisms of terrestrial dissolved inorganic, organic and particulate organic carbon (DIC, DOC, and POC) influxes are summarized in this work. Our analysis indicates that the global river average p CO 2 of 3,100 ppmV is more often exceeded by contributions from small streams when compared to rivers with larger catchments (〉500 km 2 ). Because of their large proportion in global river networks (〉96 % of the total number of streams), headwaters contribute large – but still poorly quantified – amounts of CO 2 to the atmosphere. Conservative estimates imply that globally 36 % (i.e. 0.93 Pg C yr -1 ) of total CO 2 outgassing from rivers and streams originate from headwaters. We also discuss challenges in determination of CO 2 sources, concentrations and fluxes. To overcome uncertainties of CO 2 sources and its outgassing from headwater streams on the global scale, new investigations are needed that should include groundwater data. Such studies would also benefit from applications of integral CO 2 outgassing isotope approaches and multi-scale geophysical imaging techniques.

Print ISSN: 8755-1209

Topics: Geosciences

Published by Wiley on behalf of American Geophysical Union (AGU).

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Terrestrial Sediments of the Earth: Development of a Global Unconsolidated Sediments Map Database (GUM) (2018)

Börker, J. ; Hartmann, J. ; Amann, T. ; [et al.]

American Geophysical Union

In: Geochemistry, Geophysics, Geosystems. 2018; 19(4): 997-1024. Published 2018 Apr 01. doi: 10.1002/2017gc007273.

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Publication Date: 2018-04-01

Description: Mapped unconsolidated sediments cover half of the global land surface. They are of considerable importance for many Earth surface processes like weathering, hydrological fluxes or biogeochemical cycles. Ignoring their characteristics or spatial extent may lead to misinterpretations in Earth System studies. Therefore, a new Global Unconsolidated Sediments Map database (GUM) was compiled, using regional maps specifically representing unconsolidated and quaternary sediments. The new GUM database provides insights into the regional distribution of unconsolidated sediments and their properties. The GUM comprises 911,551 polygons and describes not only sediment types and subtypes, but also parameters like grain size, mineralogy, age and thickness where available. Previous global lithological maps or databases lacked detail for reported unconsolidated sediment areas or missed large areas, and reported a global coverage of 25 to 30%, considering the ice-free land area. Here, alluvial sediments cover about 23% of the mapped total ice-free area, followed by aeolian sediments (∼21%), glacial sediments (∼20%), and colluvial sediments (∼16%). A specific focus during the creation of the database was on the distribution of loess deposits, since loess is highly reactive and relevant to understand geochemical cycles related to dust deposition and weathering processes. An additional layer compiling pyroclastic sediment is added, which merges consolidated and unconsolidated pyroclastic sediments. The compilation shows latitudinal abundances of sediment types related to climate of the past. The GUM database is available at the PANGAEA database (https://doi.org/10.1594/PANGAEA.884822). © 2018. American Geophysical Union.

Electronic ISSN: 1525-2027

Topics: Chemistry and Pharmacology , Geosciences , Physics

Published by American Geophysical Union

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