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Busted! First Detection of Steroid Hormones in Pacific Walrus Bones
Charapata P, Horstmann L, and Misarti N

The Pacific walrus (Odobenus rosmarus divergens) is a candidate species for the Endangered Species List because Arctic sea ice has declined significantly in the past decades. This project focuses on validating a method for extracting steroid hormones from archaeological, historical, and modern bone creating a baseline of hormone levels during different climate regimes.

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Experimental Evolution in Diatoms - Thermal longterm acclimation in two model diatom species
Katrin Schmidt1, Sinéad Collins2, Thomas Mock1

Experimental Evolution in two model Diatoms

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METHOD DEVELOPMENT FOR THE SIMULTANEOUS DETERMINATION OF METHYLMERCURY AND INORGANIC MERCURY IN SEAFOOD
Sergio Carneado, Ariane V. Zmozinski, Carmen Ibáñez-Palomino, Àngels Sahuquillo, José Fermín López-Sánchez, Márcia M. da Silva

This work reports the method development for the simultaneous determination of methylmercury (MeHg+) and inorganic mercury (iHg) species in seafood. The study focused on the extraction and quantification of MeHg+ by liquid chromatography coupled to on-line UV irradiation and cold vapour atomic fluorescence spectroscopy (LC-UV-HG-AFS), using HCl 4 mol L-1 as extractant agent.

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Relationships between Water Quality Constituents in the Delta and the Influence of Different Sources of Water
Richard A. Denton and Paul Hutton

Analysis of detailed grab sample data from San Francisco Bay and Delta and development of regression relationships between EC, TDS and water quality constituents such as chloride, bromide, sodium, calcium, sulfate, alkalinity and hardness. The relationships in the interior Delta vary depending upon the percentage contributions from seawater, agricultural drainage and freshwater inflows.

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Leveraging CI-H Mass Defect Plots for the Identification of Halogenated Organic Contaminants
Jonathan D. Byer, Mehran Alaee, Karl Jobst, Grazina Pacepavicius, Joe Binkley

A number of legacy contaminants and other pesticides, as well as a number of previously unknown compounds were tentatively identified in the pooled sample. Cl-H mass defect plots are a useful tool for filtering through complex data for the identification of halogenated contaminants. This technique functions as a screening tool for the identification of unknowns, and in the future, may be used as a form of fingerprinting to compare samples.

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Flash Pyrolysis Coupled to GCxGC-TOFMS and GC-High Resolution TOFMS for Characterization of Crude Oil and Petroleum Fractions
Clecio F. Klitzke, Joe Binkley, Jeffrey Patrick

The pyrolysis of asphaltenes from discrete crude oil samples shows distinct composition in terms of light and heavy aromatic hydrocarbons and alkyldibenzo-thiophenes. The use of Py–GC×GC–TOFMS is crucial for the determination of isomeric composition, and Py–GC–HRTOFMS with high resolution and high mass accuracy complements the identification by unequivocal chemical formula assignments. The study of the relationships of the crude oil and asphaltene composition are in progress.

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Microextraction techniques combined with X-ray fluorescence spectrometry for determination of different metal ions in water
Karina Kocot (a), Beata Zawisza (a), Eva Marguí (b), Ignasi Queralt (c), Rafal Sitko (a)

In present work new preconcentration procedures combining microextraction techniques and X-ray fluorescence spectroscopy were developed. Proposed methodologies are promising tools for multielemental analysis enabling detection of natural pollutants in different water samples.

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Effects of aquaculture effluents on nitrogen characteristics in two Chinese estuaries
David Kaiser, Lucia S. Herbeck

The poster describes similarities and differences of the effects aquaculture effluents have on the nitrogen composition in estuarine waters of two sites in southern China

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APPLICATION OF LIQUID CHROMATOGRAPHY WITH UV DETECTION FOR DETERMINATION OF PLANT GROWTH REGULATOR IN COMMON PLANT FERTILIZERS
Borowczyk K., Wyszczelska-Rokiel M., Stachniuk J., Chwatko G., Glowacki R.

1. The methodology allows facile and accurate determination of IBA in common plant fertilizer samples.
2. The analytical figures of linearity, precision and recovery shown during the method validation procedure are well within the criteria for biological sample analysis.
3. In temperature -18, 4 and 25 °C the analyte stays stable for 6 h.
4. The assay should help in control of phytohormones concentration in plants and fertilizers.

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Showing Results 21 - 30 of 65
Scientific News
Paper Filter Can Remove Viruses from Water
A new paper filter can purify water from viruses, even the most difficult and contagious.
Changing California Land Uses will Shape Water Demands in 2062
If past patterns of California land-use change continue, projected water needs by the year 2062 will increase beyond current supply.
Chemical Emitted by Trees Can Impact Ozone Levels
Researchers have found that the way that isoprene, a natural hydrocarbon compound emitted from broadleaf deciduous trees, is processed in the atmosphere at night can have a big impact on the ozone in the atmosphere the next day.
A New Sensor to Assess the Biodiversity in the Atmosphere
UPM researchers design a portable autonomous device capable of collecting and assessing bacterial, viral and fungal biodiversity in the air as well as pollen in different urban areas and seasons.
Measuring The Airborne Toxicants Urban Bicyclists Inhale
Researchers analyze breath biomarkers to measure uptake of volatile organic compounds by bicyclists.
Elevated Bladder Cancer Risk in New England and Arsenic in Drinking Water From Private Wells
Researchers have found that drinking water from private wells, may have contributed to the elevated risk of bladder cancer in northern new England.
Detecting Nano Amounts In Environmental Samples
The NanoUmwelt project is developing a technique that can detect nanomaterials in a variety of environmental samples.
Bioreactors Ready for the Big Time
Bioreactors are passive filtration systems that can reduce nitrate losses from farm fields.
Microbial Biosensor Designed To Evaluate Water Toxicity
UAB researchers develop new paper-based biological tool.
Coding and Computers Help Spot Methane, Explosives
Coded apertures improve and shrink mass spectrometers for field use.
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