The use of 15N
labeled N-glycans derived from IGG has alleviated quantitative MS-based glycomics variabilities originating from PNGase F digestion efficiency, chemical derivatization and ionization efficiency," states Yehia Mechref Professor in the Department of Chemistry and Biochemistry, Texas Tech University.
Additionally, trees within the same three general geographic locations where the trapping was completed (UTM: 15N
0429404 3954870; 15N
0412711 3948789; and 15N
0463354 3953264) were destructively sampled.
13]C and [delta] 15N
isotopes, reservoir and river habitat, fish ecology
Working in Sigman's lab, the investigators measured the amount of two types of nitrogen known as 14N and 15N
contained in the shells of tiny marine animal plankton called foraminifera.
March 27, 2012 /PRNewswire/ -- Los Gatos Research (LGR), the leader in precision trace gas analyzers, has released a new Isotopic N2O Analyzer that is the first instrument to directly measure 18O and site-specific 15N
ratios in trace nitrous oxide (N2O) in air, in addition to measuring the N2O mole fraction.
In the case of nitrogen, the isotopes are 14N and 15N
, although only about one in 300 nitrogen atoms is the heavier form.
in tissue from the 250 [micro]M treatment was significantly greater than [delta]15N
in control tissue through week 3, but was not different from tissue in the 25 [micro]M concentration until week 3.
Variation in the natural abundance of 15N
in the halophyte, Salicornia virginica, associated with groundwater subsidies of nitrogen in a southern California salt marsh.
This is because biological processes, such as human digestion, tend to utilise the lighter 14N isotope, leaving more 15N
in the solid waste (faecal matter) processed by sewage treatment plants.
For more information, contact the company at 908 Highway 15N
, New Albany, Michigan 38652, USA, telephone 1-662534-9081; fax 1-662-534-6040.
Nitrogen isotopes are, however, useful in determining food-chain levels of resources because 15N
is fractionated at each trophic level.
Future plans include quantitative CPMAS studies of foliage, including amounts of specific biopolymers, use of phenolic polymers as models for humic acids, and application of CPMAS 15N
NMR to soil N.