NTIMS

S.R. Sooranna, E. Oteng-Ntim, R. Meah, T.A. Ryder, and R. Bajoria. Characterization of human placental explants Morphological, biochemical and physiological studies using first and third trimester placenta. Hum Reprod (Oxford, England). 14 536-541 (1999). 

A main characteristic of TIMS is that positively or negatively charged ions of the analyte are also formed and used for mass spectrometric analysis. In negative thermal ionization mass spectrometry (NTIMS) elements or molecules with a relatively high electron affinity (/iea > 2eV) can be... 

Figure 38-8. Liquid density ol ntim on-contaming compounds trom OX to - 38

Oteng-Ntim E, Okpala IE and Anionwu EN (2003) Sickle cell disease in pregnancy. Current Opinion in Obstetrics and Gynaecology 1 3 362-368. 

Molybdenite samples from Cu-Au-Mo and magnetite deposits in the Yangtze River valley (China) have been examined by Re-Os age dating using ICP-MS and NTIMS. The results of the two mass spectrometric techniques are almost identical. The Re-Os ages of 16 molybdenite samples range from 134.7 2.3 to 143.7 1.6Ma. Emopium isotope variation in Allende CAIs with a deficit for Eu of up to %o have been detected by MC-ICP-MS. " The lack of Sm isotope fractionation in the same samples makes fractionation by kinetic processes an unlikely case of the Eu deficit. The authors interpreted that based on the low ionization potential of Eu, in which electromagnetic separation of ionized gas preferentially depletes the nebular gas in a heavy isotope. 

Trialkylaluminum compounds are colorless liquids at room temperature. Must be stored in an inert atm sensitive to oxidation and hydrolysis in air the lighter trialkylalumi -ntims ignite spontaneously in air. The low mol wt, linear-chain alkyl compounds exist as dimers the branched-chain alky] compounds exist primarily as monomers. Among the industrially important trialkyl aluminums are triethylalmm-nuut (dimeric liq, dB 0.832. bp 194°, bp,3 100°) and triiso-butylaluminum (primarily monomeric liq. dB 0.781 bp. 86°, mp 6°). 

Roy, S., Ntim, S. A., Mitra, S., and Sirkar, K. K. 2011. Facile fabrication of superior nanofiltration membranes from inter-faciaUy polymerized CNT-polymer composites. Journal of Membrane Science 375 81-87. 

SOLIS M J (1967) Aspectos biologicos del pulpo Octopus maya Voss y Solis, PubU-caciou ntim 18, lust Nacioual luvestig Biol Pesqueras (Mexico). 

M. Z. Hauschild, B. A. Ntim, Selected Topics in Environmental Management, (1993). UNESCO Series of Learning Materials in Engineering Sciences. 

By using single-collector instruments equipped with a collision/reaction cell [248, 251] or double-focusing sector field instrumentation [248], it is possible to determine selenium isotope ratios at a precision and even accuracy of 0.2-0.5% RSD for most selenium isotope ratios. This level of performance can be considered sufficient for metabolic studies in humans and compares well with what can be achieved with NTIMS, although with much lower sample requirements. 

Another common measure of concentration is number concentration, the ntim-ber of particles per unit volume of aerosol, commonly expressed as number/cm or number/m. An older unit is mppcf (million particles per cubic foot). Concentrations of bioaerosols and fibers are expressed in terms of number concentration. 

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