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1

Digitale Medien

Tidal Exchanges Between Orplands Managed Retreat Site and the Blackwater Estuary, Essex (1997)

Emmerson, R. H. C. ; Manatunge, J. M. A. ; Macleod, C. L. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Water and environment journal 11 (1997), S. 0

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ISSN: 1747-6593

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Energietechnik

Notizen: ‘Managed retreat’ is a salt-marsh restoration technique which is under experimental implementation in the UK. The technique involves the engineered tidal inundation of coastal land in front of re-aligned flood defences. Salt marshes developed by this method are intended to act as hydraulic buffers in front of coastal defences and to provide zones of environmental enhancement. Two managed retreat trials were instigated in 1995 on the Blackwater Estuary, Essex, UK. In June 1995, two months after breaching the seawalls, the initial environmental impact and geochemical development of the Orplands managed retreat site were investigated by surveys of tidal exchanges. Tidal stage curves and quantities of exchange were determined by four hydrological surveys at the extremes of a neap-spring tidal cycle, and the chemistry of exchanges was investigated by water sampling during these surveys.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1747-6593.1997.tb00992.x

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2

Digitale Medien

A photometric redshift of z = 6.39 ± 0.12 for GRB 050904 (2006)

Haislip, J. B. ; Nysewander, M. C. ; Levan, A. ; [weitere]

[s.l.] : Nature Publishing Group

Nature 440 (2006), S. 181-183

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Gamma-ray bursts (GRBs) and their afterglows are the most brilliant transient events in the Universe. Both the bursts themselves and their afterglows have been predicted to be visible out to redshifts of z ≈ 20, and therefore to be powerful probes of the early Universe. The burst GRB 000131, ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/nature04552

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3

Digitale Medien

Regulation of CAT: Cationic amino acid transporter gene expression (1996)

MacLeod, C. L. ; Kakuda, D. K.

Springer

Amino acids 11 (1996), S. 171-191

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ISSN: 1438-2199

Schlagwort(e): Cationic amino acid transport ; Arginine transport ; Regulation of mCAT2

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary The majority of mammalian cationic amino acid transport is mediated by the transport system y+ which facilitates Na+ independent cationic amino acid (arginine, lysine, & ornithine) transport and Na+ dependent zwitterionic amino acid (glutamine & homoserine) transport. Other transport systems y+L, b0,+ and B0,+ also mediate cationic amino acid transport. Their broad substrate specificities and overlapping expression patterns confound biochemical analysis. The isolation of cDNA clones has permitted an analysis of their regulation and opens the opportunity to define the role of each protein in specific cell types. Two genes,Cat1 andCat2 encode transporters with properties similar to the y+ transport system. Thecat2 gene from the mouse encodes two distinct proteins. mCAT2, and mCAT2A via alternate splicing; each protein has distinctly different transport properties. The regulation of mCAT1, mCAT2 and mCAT2A proteins are reviewed here. The implications of this gene specific regulation on cationic amino acid transport is discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00813859

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4

Digitale Medien

Meeting report on membrane transport and metabolism 4th International Congress on Amino Acids Vienna, Austria, August 7–11, 1995 (1996)

MacLeod, C. L.

Springer

Amino acids 11 (1996), S. 105-106

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ISSN: 1438-2199

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary The session on Membrane Transport was a lively, interactive one with substantial audience participation in the discussion periods. Progress in this area of amino acid science is rapid as the genes encoding the transporter proteins are being cloned and characterized. The contributors to the platform session represented institutions from several countries giving the meeting a truly international flavor. Most of the participants contributed articles to this volume. The platform speakers were Dr. John McGivan (United Kingdom), Dr. Marçal Pastor-Anglada (Spain), Dr. Bruce Stephens (USA), Dr. G. Gazzola and Dr. V. Dall'Asta (Italy), Dr. Carol MacLeod (USA), Miss Maria Rivera-Correa (Puerto Rico), Dr. Ellen Closs (Germany), Dr. Manuel Palacín (Spain), Dr. Ovidio Bussolati (Italy), Dr. Suresh Tate (USA), Dr. S. Nakamura (Japan).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00813854

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5

Digitale Medien

Mercuty in Precipitation and Its Relation to Bioaccumulation in Fish: A Literature Review (1998)

Downs, S. G. ; MacLeod, C. L. ; Lester, J. N.

Springer

Water, air & soil pollution 108 (1998), S. 149-187

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ISSN: 1573-2932

Quelle: Springer Online Journal Archives 1860-2000

Thema: Energietechnik

Notizen: Abstract Increases in industrial mercury (Hg) emissions in recent years have led many researchers to believe that Hg from the atmosphere constitutes a main source of Hg to aquatic biota in the absence of point source discharges. Established background levels for fish (0.2–1.0 mg kg-1) now exceed the pre industrial level of 0.15 mg kg-1, suggesting an anthropogenic origin. This review of recent literature illustrates how levels of mercury (Hg) species in the atmosphere are effectively transported into the aquatic arena, where chemical parameters combine to determine bioaccumulation rates in fish. Limited studies on methyl mercury (MeHg) in precipitation shown that concentrations average from 5% of total-Hg (T-Hg), to 1% in industrial regions. Observations of increased Hg is snow and precipitation from the Arctic Circle, related to poleward atmospheric circulation patterns, also demonstrate a spring maximum accompanying ozone depletion. Increases in oxidants and soil derived Hg in the atmosphere during the summer best explain summer Hg maximums observed in precipitation, while increased temperatures raise fish metabolism increasing Hg uptake through respiration and ingestion rate. The major route of entry for MeHg to fish appears to be biomagnification, after input from precipitation, runoff and inlake methylation. Regions buffered against acid precipitation maintain low fish-Hg levels by reduced MeHg production and maintaining gill function. When considering the bioaccumulation of Hg in fish this study shows that there are many variables to consider, not all of which originate from inside the aquatic arena. Both catchment and atmospheric processes combine with aquatic variables to dictate the overall levels of MeHg observed in fish tissue. There now appears to be sufficient knowledge to develop an axiom for the identification of aquatic systems likely to be susceptible to bioaccumulation from atmospheric derived Hg.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1005023916816

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