scholarly journals New method of isotopic analysis: baseline‐standardized isotope vector analysis shows trophic partitioning in loricariids

Ecosphere ◽  
2021 ◽  
Vol 12 (5) ◽  
Author(s):  
Corinthia R. Black ◽  
Jonathan W. Armbruster
Keyword(s):  
Isotopic Analysis ◽  
New Method ◽  
Vector Analysis ◽  
Trophic Partitioning

scholarly journals A new method for the determination of the δ18O composition of bone phosphate: applications to the thermal physiology of vertebrates

1992 ◽  
Vol 6 ◽  
pp. 269-269
Author(s):  
William J. Showers ◽  
Bernard Genna ◽  
Reese E. Barrick ◽  
Alfred G. Fischer
Keyword(s):  
Isotopic Analysis ◽  
Xrd Analysis ◽  
Exchange Chromatography ◽  
New Method ◽  
Small Samples ◽  
Thermal Physiology ◽  
Fossil Bone ◽  
Thin Sections ◽  
Bone Material ◽  
Silver Phosphate

A new method for the preparation of bone samples for δ18O-PO4 analysis has been developed. The phosphate from bone samples is separated and purified using ion exchange chromatography, and then precipitated as silver phosphate using the Firsching method. O2 is then extracted by reaction with bromine pentafluoride and converted to CO2 for isotopic analysis. Advantages of the silver phosphate technique over the bismuth phosphate technique are (1) the simplicity of the method, (2) silver phosphate is not hygroscopic so atmospheric water is not an oxygen contaminate, and (3) very small samples (2 mg to 10 mg) can be analyzed with an increase of precision compared to previous techniques. Iron and silica oxides added to Ag3PO4 standards produce no offset, which suggests that this new technique is not sensitive to interferences from cements commonly found in fossil bone material. Analyses have been performed on standards ranging in size from 30 mg to 2 mg with a σ1 of ± 0.05 per mil.The δ18O-PO4 compositional pattern of the bones of modern vertebrates have been analyzed to provide a base for the interpretation of the δ18O-PO4 pattern of fossil vertebrates. The average %PO4 in modern mammals and reptiles is approximately 15% with a σ1 of 2-3 %. The average %PO4 of fossil reptiles range from 10 to 25% with σ1 variations of up to 10%. The %PO4 variation can be related to cementation of void spaces in the bone material. XRD analysis reveals that calcite, dolomite, ankerite, and silica cements are commonly present. FTIR (Fourier Transform Infrared Spectroscopy) yields low indices calculated according to the formula of Shemesh, 1990 [GCA 54(9):2433]. Thin sections of the fossil bone material show detailed structures. All this evidence suggests that the fossil bone δ18O-PO4 composition is pristine and not altered by diagenesis. The total δ18O-PO4 σ1 variation of 10 or more skeletal elements analyzed for each individual specimen varies from 0.1 per mil for a domestic cow (Bos) to 0.8 per mil for a Komodo dragon (Varanus). Variations in between appear to be related to thermal physiology and variations in drinking water δ18O due to seasonality or migration.

A new method for carbon isotopic analysis of protein

Science ◽  
1991 ◽  
Vol 251 (4993) ◽  
pp. 552-554 ◽  
Author(s):  
D. Nelson
Keyword(s):  
Isotopic Analysis ◽  
New Method ◽  
Carbon Isotopic

Separation of methylmercury from biological samples for stable isotopic analysis

2021 ◽  
Author(s):  
Wei Zhang ◽  
Guangyi Sun ◽  
Runsheng Yin ◽  
Xinbin Feng ◽  
Zuxiu Yao ◽  
...  
Keyword(s):  
Biological Samples ◽  
Isotope Composition ◽  
Isotopic Analysis ◽  
New Method ◽  
Stable Isotopic Analysis ◽  
Stable Isotopic ◽  
Total Hg

A new method of separation and pre-concentration of methylmercury (MeHg) species from total Hg in biological samples for determining the MeHg isotope composition.

Strontium isotopic analysis of environmental microsamples by inductively coupled plasma - tandem mass spectrometry

2022 ◽  
Author(s):  
Stefano Bertinetti ◽  
Eduardo Bolea-Fernandez ◽  
Mery Malandrino ◽  
Beatrice Moroni ◽  
David Cappelletti ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Isotopic Analysis ◽  
New Method ◽  
Tandem Mass ◽  
Inductively Coupled ◽  
Icp Ms

In this work, a new method has been developed for accurate and precise Sr isotopic analysis of microsamples via inductively coupled plasma - tandem mass spectrometry (ICP-MS/MS). For introduction of...

Revisiting nutrient utilization in the glacial Antarctic: Evidence from a new method for diatom-bound N isotopic analysis

2004 ◽  
Vol 19 (3) ◽  
pp. n/a-n/a ◽  
Author(s):  
Rebecca S. Robinson ◽  
Brigitte G. Brunelle ◽  
Daniel M. Sigman
Keyword(s):  
Isotopic Analysis ◽  
Nutrient Utilization ◽  
New Method

scholarly journals Static Structures in Leaky Mode Waveguides

2019 ◽  
Vol 9 (2) ◽  
pp. 247 ◽  
Author(s):  
Daniel Pettingill ◽  
Daniel Kurtz ◽  
Daniel Smalley
Keyword(s):  
Higher Order ◽  
Field Of View ◽  
New Method ◽  
Leaky Mode ◽  
Vector Analysis ◽  
Image Point ◽  
Wide Field ◽  
Grating Structure ◽  
Wide Field Of View ◽  
Order Of Magnitude

In this work, we suggest a new method of expanding the field of view in bottom-exit, leaky mode devices for transparent, monolithic, holographic, near-eye display. In this approach, we propose the use of static, laser-induced, grating structures within the device substrate to break the leaky mode light into diffracted orders. We then propose to use carefully timed illumination pulses to select which diffracted order is visible to the eye at every display refresh interval (up to 100 kHz). Each of these orders becomes a view for a different image point. To describe this new method, we use K-vector analysis. We give the relevant equations and a list of parameters which lead to a near-eye geometry with little or no overlap in higher-order view zones. We conclude that it should be possible to increase the field of view of our bottom-exit, leaky mode devices by as much as one order of magnitude by simply adding a laser-induced grating structure to the substrate and by carefully timing the device illumination. If successful, this method would make possible a transparent, holographic, near-eye display that is simple to fabricate, relative to pixelated approaches, and which has a wide field-of-view relative to our current bottom-exit displays.

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