Volatility display

In order to better understand the relationship of volatility and temperature a simple experiment was designed and completed. The results are shown in Figure S. The plot shows that the volatility displays Arrhenius behavior under these conditions. 

LC can be used for both volatile and nonvolatile substances, but GC can handle only volatile substances. Chromatography was originally a method for separating and displaying mixtures of colored substances on a colorless column of solid material. The word chromatography is derived from chroma (color) and graph (writing). 

Polyethylene displays good heat resistance in the absence of oxygen in vacuum or in an inert gas atmosphere, up to the temperature of 290°C. Higher temperature brings about the molecular-chain scission followed by a drop in the molecular-weight average. At temperatures in excess of 360°C the formation of volatile decomposition products can be observed. The main components are as follows ethane, propane, -butane, n-pentane, propylene, butenes and pentenes [7]. 

Boric acid esters have aroused considerable interest because they are stable up to the temperature of 450°C, display low volatility and good compatibility without migration from olefin. 

As there exists such a distinct difference in the spectrum of the volatile diterpenic components of both species, it would be advantageous to transfer these results to TLC in order to display these taxonomic marker substances as a tool for quality assurance operations. 

Lane 1 displays the separation of the resin of B. carterii and lane 2 and lane 3 its volatile fractions received by hydrodistillation. Accordingly, lane 8 displays the... 

In a search for CVD precursors for beryllium, the air sensitive, volatile solid CpBe(SiMe3) 17 was prepared from the reaction of Li[SiMe3] with CpBeCl in pentane.62 Characterized with single crystal X-ray diffraction, multinuclear NMR, and mass spectra, the compound displays a Be-Si bond length of 2.185(2) A that is somewhat longer than the sum of covalent radii (2.01 A). The lengthening is similar to that observed in the related Be(Si(/-Bu)3)2 (Be-Si = 2.193(1) A),63 so there is not a pronounced effect from the Cp ligand on the Be-Si interaction. 

The authors constructed an 80-well hydrogenator. Fifteen catalysts were screened and the isotopic incorporation assessed by LC/MS. The regiospecificity was determined by VAST Direct Injection NMR [82] in conjunction with SPADEZ [83], a multispectrum analysis tool - this is capable of displaying and quantifying up to 96 spectra. So far it has not been possible to vary the solvents as, under the experimental conditions, the more volatile distil over into the less volatile solvents. 

As in most of the separation methods, the stripping and collection techniques have not been investigated for their recovery efficiences except in isolated instances. Kuo et al. [50] have found recovery efficiences for volatile polar organics ranging from 9.5% for ethanol to 88.8% for acetone. Most of the model compounds displayed recovery efficiencies in the 60 - 80% region under the conditions of their experiment. 

Unlike control females, chemically naive females do not prefer the volatile components of male odors compared to female odors. When these females are allowed contact with the odors, however, they demonstrate robust preferences for the male odors. Critically, initially naive females that receive contact experience with male soiled bedding as adults display sexual odor preferences when subsequently... 

Our laboratory has begun to determine if this phenomenon of experience-dependent attraction to male volatile cues also occurs in female Syrian hamsters, as experiential effects on odor preference may vary according to species. Syrian hamsters provide an ideal model species for studying sexual preference as these behaviors are almost exclusively mediated by chemosensory cues (Johnston 1983). Furthermore, both males and females display robust preferences for opposite-sex volatile odors that are independent of adult sexual experience (Landauer, Banks and Carter 1977 Petrulis and Johnston 1999), suggesting that early olfactory experience may play a critical role in the development of these behaviors. 

The observation of d-orbitals is not the only information obtainable from UPS spectra, nor probably the most important, since a P.E. spectrum is a display showing at the same level of evidence and detail the system of all the energy levels corresponding to all molecular orbitals of the valence shell of a volatile coordination compound, the d-based as well as the ligand-based orbitals. It has therefore the merit of showing with utmost evidence the arbitrariness of focussing the investigation on the d-shell... 

---