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  • 1
    Electronic Resource
    Electronic Resource
    Selective spectrofluorometric determination of lithium(I) with quinizarin by extraction into tributyl phosphate (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 356 (1996), S. 320-325 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A method for the determination of trace amounts of lithium at the ppb level has been described based on the reaction of lithium(I) with 1,4-dihydroxyanthraquinone (quinizarin) in alkaline medium, extraction into tributyl phosphate (TBP) and measurement of the fluorescence of the organic phase. A linear calibration was found in the concentration range of 9–250 ppb of lithium in aqueous solutions (λexc=590 nm, λem=670 nm) with a RSD of 2.7% for 100 ppb of lithium. After a prior treatment with potassium carbonate the method is highly specific for the analysis of lithium in presence of other inorganic ions. The proposed procedure has been applied for the determination of lithium in mineral waters, drugs and vegetables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663560320
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Changes in distribution of Greenland halibut in a varying environment (2013)
    Oxford University Press
    Details
    Publication Date: 2013-02-21
    Description: Morgan, M. J., Garabana, D., Rideout, R. M., Román, E., Pérez-Rodriguez, A. and Saborido-Rey, F. 2013. Changes in distribution of Greenland halibut in a varying environment. – ICES Journal of Marine Science, 70: 352–361. Fish are expected to respond to changing oceanographic temperature by altering their distribution. Off the coast of Newfoundland, Canada, there have been major changes in oceanographic temperature over the last several decades, with both record cold and record warm years being observed. Greenland halibut is an important flatfish species in the area, and is distributed in deep waters over a very wide geographic range. Thus, it might be buffered from temperature change in the overall area by reduced temperature variation at depth, and the diverse temperature conditions over its wide range. We examined intrapopulation variation in temperature and depth distribution, and the biological changes in relation to changes in available temperature. On the Flemish Cap, variation in available temperature was limited, and changes in depth were related to changing age composition and the differential depth distribution with age/size. In other areas there was a larger decline in available temperature, and associated with this, Greenland halibut moved to deeper waters and occupied warmer temperatures than they had previously. Concurrently, growth declined and condition increased. This study shows that shifts in distribution may not result in maintenance of homogeneous environmental conditions, and that resulting biological changes will be difficult to predict.
    Print ISSN: 1054-3139
    Electronic ISSN: 1095-9289
    Topics: Biology , Geosciences , Physics
    Published by Oxford University Press
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  • 3
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    Metalloenzyme-like catalysis of sugars by zeolites [Chemistry] (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-06-20
    Description: Isomerization of sugars is used in a variety of industrially relevant processes and in glycolysis. Here, we show that hydrophobic zeolite beta with framework tin or titanium Lewis acid centers isomerizes sugars, e.g., glucose, via reaction pathways that are analogous to those of metalloenzymes. Specifically, experimental and theoretical investigations reveal that glucose partitions into the zeolite in the pyranose form, ring opens to the acyclic form in the presence of the Lewis acid center, isomerizes into the acyclic form of fructose, and finally ring closes to yield the furanose product. The zeolite catalysts provide processing advantages over metalloenzymes such as an ability to work at higher temperatures and in acidic conditions that allow for the isomerization reaction to be coupled with other important conversions.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    Immunostimulatory DNA sequences necessary for effective intradermal gene immunization (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-07-19
    Description: Vaccination with naked DNA elicits cellular and humoral immune responses that have a T helper cell type 1 bias. However, plasmid vectors expressing large amounts of gene product do not necessarily induce immune responses to the encoded antigens. Instead, the immunogenicity of plasmid DNA (pDNA) requires short immunostimulatory DNA sequences (ISS) that contain a CpG dinucleotide in a particular base context. Human monocytes transfected with pDNA or double-stranded oligonucleotides containing the ISS, but not those transfected with ISS-deficient pDNA or oligonucleotides, transcribed large amounts of interferon-alpha, interferon-beta, and interleukin-12. Although ISS are necessary for gene vaccination, they down-regulate gene expression and thus may interfere with gene replacement therapy by inducing proinflammatory cytokines.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sato, Y -- Roman, M -- Tighe, H -- Lee, D -- Corr, M -- Nguyen, M D -- Silverman, G J -- Lotz, M -- Carson, D A -- Raz, E -- AI36214/AI/NIAID NIH HHS/ -- AI37305/AI/NIAID NIH HHS/ -- AR41897/AR/NIAMS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1996 Jul 19;273(5273):352-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine and The Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0663, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8662521" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Ampicillin Resistance/*genetics ; Animals ; *Antibody Formation ; Base Sequence ; CpG Islands ; Cytokines/*biosynthesis ; DNA/chemistry/genetics/*immunology ; Female ; Gene Expression Regulation ; Genetic Vectors ; Humans ; Injections, Intradermal ; Interferons/biosynthesis ; Interleukin-12/biosynthesis ; Mice ; Mice, Inbred BALB C ; Molecular Sequence Data ; Monocytes/immunology ; Plasmids/genetics/*immunology ; Th1 Cells/immunology ; Transfection ; *Vaccination ; beta-Galactosidase/*immunology
    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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  • 5
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    The functional diversity of retinal ganglion cells in the mouse (2016)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2016-01-07
    Description: In the vertebrate visual system, all output of the retina is carried by retinal ganglion cells. Each type encodes distinct visual features in parallel for transmission to the brain. How many such 'output channels' exist and what each encodes are areas of intense debate. In the mouse, anatomical estimates range from 15 to 20 channels, and only a handful are functionally understood. By combining two-photon calcium imaging to obtain dense retinal recordings and unsupervised clustering of the resulting sample of more than 11,000 cells, here we show that the mouse retina harbours substantially more than 30 functional output channels. These include all known and several new ganglion cell types, as verified by genetic and anatomical criteria. Therefore, information channels from the mouse eye to the mouse brain are considerably more diverse than shown thus far by anatomical studies, suggesting an encoding strategy resembling that used in state-of-the-art artificial vision systems.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4724341/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4724341/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baden, Tom -- Berens, Philipp -- Franke, Katrin -- Roman Roson, Miroslav -- Bethge, Matthias -- Euler, Thomas -- U01 NS090562/NS/NINDS NIH HHS/ -- U01NS090562/NS/NINDS NIH HHS/ -- England -- Nature. 2016 Jan 21;529(7586):345-50. doi: 10.1038/nature16468. Epub 2016 Jan 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Bernstein Centre for Computational Neuroscience, 72076 Tubingen, Germany. ; Centre for Integrative Neuroscience, University of Tubingen, 72076 Tubingen, Germany. ; Institute for Ophthalmic Research, 72076 Tubingen, Germany. ; Baylor College of Medicine, Houston, Texas 77030, USA. ; Institute of Theoretical Physics, University of Tubingen, 72076 Tubingen, Germany. ; Graduate Training Centre of Neuroscience, University of Tubingen, 72074 Tubingen, Germany. ; Max Planck Institute of Biological Cybernetics, 72076 Tubingen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26735013" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 6
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    [ASAP] Charge Transfer and p to p* Transitions in the Visible Spectra of Sulfheme Met Isomeric Structures (2018)
    American Chemical Society (ACS)
    Details
    Publication Date: 2018-05-03
    Description: The Journal of Physical Chemistry B DOI: 10.1021/acs.jpcb.7b12393
    Electronic ISSN: 1520-5207
    Topics: Chemistry and Pharmacology , Physics
    Published by American Chemical Society (ACS)
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  • 7
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    Lacustrine stable isotope record of precipitation changes in Nicaragua during the Little Ice Age and Medieval Climate Anomaly (2013)
    Geological Society of America (GSA)
    In: Geology
    Details
    Publication Date: 2013-01-30
    Description: Discerning the influences of the El Niño Southern Oscillation (ENSO) and the North Atlantic Oscillation (NAO) on drought variability in the tropics during the Medieval Climate Anomaly (MCA) and Little Ice Age (LIA) will help to improve our understanding of climate system responses to internal and external forcing. Sediments from Lago El Gancho, Nicaragua, provide an ~1400 yr record of water balance (precipitation and evaporation) changes from a region that is sensitive to teleconnected Pacific and Atlantic ocean-atmosphere dynamics. Oxygen isotope values of ostracod carapaces ( 18 O ostracod ) are consistently low in El Gancho sediments between ca. A.D. 950 and 1250, indicating that wetter conditions prevailed during the MCA, a period of La Niña–like mean state conditions in the tropical Pacific, and a positive mean state of the NAO. The ~150 yr period between the MCA and LIA was marked by an abrupt shift to persistently drier conditions at a time of highly variable Pacific sea-surface temperatures, and a transition toward a more negative NAO phase. In sediment from ca. A.D. 1450 to the present, 18 O ostracod values increase, suggesting that drier conditions persisted through most of the LIA, a time of a relatively negative NAO phase and El Niño–like mean state conditions in the tropical Pacific. The long-term precipitation trends inferred from the El Gancho data are not entirely consistent with modern associations between precipitation in the circum-Caribbean region and the NAO, suggesting that present-day hydroclimatic shifts resulting from variability in synoptic climate patterns are dissimilar to changes resulting from teleconnected ocean-atmosphere dynamics that operated during the MCA and LIA.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 8
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    Selective spectrofluorometric determination of lithium(I) with quinizarin by extraction into tributyl phosphate (1996)
    Springer
    Details
    Publication Date: 1996-11-01
    Print ISSN: 0937-0633
    Electronic ISSN: 1432-1130
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 9
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    Anthropogenic impact in the Maya Lowlands of Petén, Guatemala, during the last 5500 years (2018)
    Wiley
    Details
    Publication Date: 2018-02-16
    Description: ABSTRACT Trace and rare earth elements from a sediment core from Lake Petén Itzá (Guatemala) depict the geochemical dynamics affecting the lake from ∼5500 a BP to the present. This timing encompasses the Preclassic (4000–1700 a BP) and Classic Periods (1700−1000 a BP) when thriving Maya societies extensively cleared land for agriculture. We demonstrate that this land use occurred during times of increased precipitation, where both processes resulted in increased erosion. Rare earth element ratios depict high precipitation rates between 3000 and 1000 a BP, correlating with an increase in allochthonous silicate input and low organic carbon in the ‘Maya Clay’ stratigraphic section, where this layer is ascribed to intensive anthropogenic land use. Cesium anomalies provide additional evidence for runoff due to high rainfalls and amplified by anthropogenic impacts. The Petén Itzá core contains anomalous spikes of arsenic and mercury, and these peaks correspond to documented volcanic eruptions and therefore are probably natural. The geochemical composition of sediments and palynological records indicate re-growth of the forest after ∼900 a BP. This increased forest vegetation coincides with the timing of the decline in Maya agriculture.
    Print ISSN: 0267-8179
    Electronic ISSN: 1099-1417
    Topics: Geography , Geosciences
    Published by Wiley
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  • 10
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    Mechanism Design Principle for Optical-Precision, Deployable Instruments (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The present paper is intended to be a guide for the design of 'microdynamically quiet' deployment mechanisms for optical-precision structures, such as deployable telescope mirrors and optical benches. Many of the guidelines included herein come directly from the field of optomechanical engineering, and are neither newly developed guidelines nor are they uniquely applicable to high-precision deployment mechanisms. However, the application of these guidelines to the design of deployment mechanisms is a rather new practice, so efforts are made herein to illustrate the process through the discussion of specific examples. The present paper summarizes a more extensive set of design guidelines for optical-precision mechanisms that are under development.
    Keywords: Mechanical Engineering
    Type: AIAA Paper 2000-1409 , 41st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference; Apr 03, 2000 - Apr 06, 2000; Atlanta, GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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