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Chemistry

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Displaying 551 - 575 of 1916

A Humidity Generator for Temperatures to 200 degC and Pressures to 1.6 MPa

November 30, 2012
Author(s)
D Vega-Maza, W. Wyatt Miller, Dean C. Ripple, Gregory E. Scace
We have constructed a new humidity generator that produces gas streams of known moisture content at temperatures from 85 °C to 200 °C, absolute pressures from 0.2 MPa to 1.6 MPa, and relative humidities from 10 % to 90 %. The generator produces a moist gas

Absolute line intensities for ethylene from 1800 to 2350 cm-1.

November 17, 2012
Author(s)
Walter J. Lafferty, Jean-Marie Flaud, A. Ben Hassen, F. K. Kwabia Tchana, X Landsheere, H Aroui
Fourteen Fourier transform spectra of ethylene (C2H4) have been recorded in the 1800-2350 spectral domain with different path-lengths and pressures and used to derive individual line intensities for lines belonging to the ν7 + ν8, ν4 + ν8 , ν6 + ν10, ν6 +

Biosynthesis of Athmu, a alpha,gamma-hydroxy-ss-amino acid of pahayokolides A-B

October 2, 2012
Author(s)
Li Liu, Dan Bearden, Juan C. Rodriguez, Kathleen S. Rein
Pahayokolides A-B are cyanobacteria derived non-ribosomal peptides which exhibit cytotoxicity against a number of cancer cell lines. The biosynthetic origin of the 3-amino-2,5,7,8- tetrahydroxy-10-methylundecanoic acid (Athmu) moiety has been investigated

Recommended vapor pressure and thermophysical data for ferrocene

August 14, 2012
Author(s)
Michal Fulem, Kvetoslav Ruzicka, Marisa A. Rocha, Luis M.N.B.F. Santos, Robert F. Berg
Recommended vapor pressure data for ferrocene (CAS Registry Number: 102-54-5) in the temperature range from 242 to 447 K were developed by the simultaneous correlation of critically assessed vapor pressures, heat capacities of the crystalline phase and the

Ionic Liquid Facilitated Introduction of Functional Materials into Biopolymer Polymer Substrates

August 2, 2012
Author(s)
Shonali Nazare, Jeffrey W. Gilman, Mauro Zammarano, Luke Haverhals, W.Matthew Reichert, Hugh De Long, Paul C. Trulove
In addition to being efficient solvents for biopolymers, several ionic liquids (ILs) have been shown to be effective solvents for synthetic polymers such as meta-aramids, i.e., Nomex ® (1-5). In this report, meta-aramid/cotton composites are generated by

SEABIRD TISSUE ARCHIVAL AND MONITORING PROJECT: Egg Collections and Analytical Results for 2006-2009

August 2, 2012
Author(s)
Stacy S. Schuur, Paul R. Becker, Sylvain Berail, Russell D. Day, Olivier F. Donard, Keith A. Hobson, Amanda J. Moors, Rebecca S. Pugh, Lauren B. Rust, David G. Roseneau
Since 1999, the Seabird Tissue Archival and Monitoring Project (STAMP) has collected, banked, and analyzed seabird eggs using established protocols to monitor chlorinated pesticides, polychlorinated biphenyls (PCBs), brominated flame retardants, and

Comparison of JP-8 and JP-8+100 with the Advanced Distillation Curve Approach

August 1, 2012
Author(s)
Thomas J. Bruno, Kathryn R. Abel, Jennifer Riggs
Additive packages are used with aviation kerosenes to achieve performance enhancements such as higher or lower operating temperatures or increased lubricity. An additive used to increase operating temperatures for heat sink applications is the +100

Quantitative Methods to Characterize Cell Lines: Comparison of Cells from Marine and Terrestrial Mammals.

July 28, 2012
Author(s)
Tighe Spurlin, John T. Elliott, Michael W. Halter, Kiran Bhadriraju, Alessandro Tona, Anne L. Plant, Annalaura Mancia, Bobby L. Middlebrooks, Gregory W. Warr
Descriptive terms are often used to characterize cells in culture, but the use of nonquantitative and poorly defined terms can lead to ambiguities when comparing data from different laboratories. Although recently there has been a good deal of interest in

13C - NMR Absorptions of Major Functional Groups

June 22, 2012
Author(s)
Thomas J. Bruno, Paris D. Svoronos
The table below lists the 13C chemical shift ranges (in ppm) with the corresponding functional groups in descending order. A number of typical simple compounds for every family are given to illustrate the corresponding range. The shifts for the carbons of

15 N - NMR Chemical Shifts of Major Chemical Families

June 22, 2012
Author(s)
Thomas J. Bruno, Paris D. Svoronos
The following table contains 15N NMR chemical shifts of various organic nitrogen compounds. Chemical shifts are expressed relative to different standards (NH 3, NH 4Cl, CH 3NO 2, NH 4NO 3, HNO 3, etc.) and are interconvertible. Chemical shifts are

Analytical Standardization and Calibration

June 22, 2012
Author(s)
Thomas J. Bruno
Most modern instrumental techniques used in analytical chemistry produce an output or signal that is not absolute; the signal or peak is not a direct quantitative measure of concentration or target analyte quantity. Thus, to perform quantitative analysis

Atomic Masses and Abundances

June 22, 2012
Author(s)
Thomas J. Bruno, Paris D. Svoronos
The following table lists the atomic masses and relative percent concentrations of naturally occurring isotopes of importance in mass spectroscopy.

Common Mass Spectral Fragmentation Patterns of Organic Compound Families

June 22, 2012
Author(s)
Thomas J. Bruno, Paris D. Svoronos
The following table provides a guide to the identification and interpretation of commonly observed mass spectral fragmentation patterns for common organic functional groups [1-10]. It is of course highly desirable to augment mass spectroscopic data with as

Common Mass Spectral Fragments Lost

June 22, 2012
Author(s)
Thomas J. Bruno, Paris D. Svoronos
The following table gives a list of neutral species that are most commonly lost when measuring the mass spectra of organic compounds. The list is suggestive rather than comprehensive, and should be used in conjunction with other sources [1-5]. The listed

Common Spurious Infrared Absorption Bands

June 22, 2012
Author(s)
Thomas J. Bruno, Paris D. Svoronos
The following table provides some of the common potential sources of spurious infrared absorptions that might appear on a spectrum.

Common Spurious Signals Observed in Mass Spectrometers

June 22, 2012
Author(s)
Thomas J. Bruno, Paris D. Svoronos
The following table provides guidance in the recognition and interpretation of spurious signals (m/z peaks) that will sometimes be observed in measured mass spectra [1]. Often, the occurrence of these signals can be predicted by the recent history of the
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