Range extension

With the establishment of clear-cut flavone races, the next obvious question was how the pattern became established. One possibility discussed by Mastenbroek (1983) involved selection for flavone profiles in response to some environmental factor or factors, climatological or edaphic being the most obvious ones. Alternatively, the present-day distribution pattern may be the result of historical factors (1) migration involving long- or intermediate-distance dispersal (2) range extension... 

Recent work identifying Plagiochila retrorsa Gottsche from collections made in the Azores and Madeira establishes a significant range extension for a taxon, known under several other names, which occurs in the southern Appalachian Mountains and in Costa Rica. Rycroft et al. (2001) described morphological and phytochemical characteristics of representative specimens of this liverwort. Phytochemically, P. retrorsa belongs to the 9,10-dihydrophenanthrene chemotype species (major stmctural type is that of compounds 449 and 450). 

Greaser, C.S. Stygall, J.W. A Comparison of Overtone and Fundamental Resonances for Mass Range Extension by Resonance Ejection in a Quadrupole Ion Trap Mass Spectrometer. Int. J. Mass Spectrom. 1999,190/191, 145-151. 

Dissolution measurements under the microscope, therefore, are a powerful tool for selecting solvents or plasticizers. Measurements of elastic range extension give insight into structural changes caused by plasticizers. Thermal diffusivity and heat conductivity measurements are recommended to detect side group and other transitions in polymers and other substances. 

Dualflow, with round holes in the l/8-l/2in. range, extensively... 

FT/ICR experiments have conventionally been carried out with pulsed or frequency-sweep excitation. Because the cyclotron experiment connects mass to frequency, one can construct ("tailor") any desired frequency-domain excitation pattern by computing its inverse Fourier transform for use as a time-domain waveform. Even better results are obtained when phase-modulation and time-domain apodization are used. Applications include dynamic range extension via multiple-ion ejection, high-resolution MS/MS, multiple-ion simultaneous monitoring, and flatter excitation power (for isotope-ratio measurements). 

F is the optical density of the range extension filter if moved out of the light path... 

Dynamic range extension in GD quadrupole/ion-trap MS based on selective ion-accumulation (e.g. by mass-selective instability, single-frequency resonance ejection, combined rf-dc and entrance end-cap dc methods) allows the selective accumulation of the analyte ions and enables the dynamic range to be increased by a factor of 105 [233]. The linearities and relative trapping efficiencies of the previous methods were assessed with respect to the injection time and the methods were used for the GD ion-trap MS determination of major and minor constituents in NIST SRM 1103 Free Cutting Brass. 

Kaiser, R. E., Jr., Cooks, R. G., Moss, J. and Hemberger, P. H. Mass range extension in a quadrupole ion-trap mass spectrometer. Rapid Commun. Mass Spectrom. 3 50-53,... 

Geter, D.R., W.E. Hawkins, J.C. Means and G.K. Ostrander. Pigmented skin tumors in gizzard shad (Dorosoma cepedianuni) from the south-central United States range extension and further etiological studies. Environ. Toxicol. Chem. 17 2282—2287, 1998. 

Is the product new or a range extension What competition, if any, is it up against What is the key objective for the product ... 

Webb, S. 1987. Beech range extension and vegetation history pollen stratigraphy of two Wisconsin Lakes. Ecology 68, 1993-2005. 

As expected, for a given particle, the fractional range extension is more at smaller incident velocities and for a given velocity it is more for a particle of higher Z. It is customary (10) to display range extension as a... 

One broad T, spans both original ranges Extensive but incomplete mixing... 

It might appear that peak width merely serves as range extension. Yet, since peak width is related to a time span, which in turn is related through linear flow velocity to volumetric rate, peak width measurements allow flow titrations to be performed in a novel way. Therefore, similarly to classical batch titrations, FIA titrations encompass a domain of determinations, which cannot be performed in any other way, because they are based on consumption of an equivalent amount of reagent and, therefore, titrations yield different information than a direct measurement (pH measurement versus titration of a mixture of a weak and strong acid). 

De Sylva, D.P. (1999). Global warming and potential range extensions of poisonous and dangerous marine organisms. WorldResour. Rev. 11, 174—189. 

---