Cotton comparison

Lyocell can be processed in conventional open width systems. Because the mechanical action on the fabric is virtually eliminated the result is a flat classical fabric. Aesthetical differentiation is reduced against cotton, but the lyocell (or blend) will still be softer and more fluid than a cotton comparison. No fibrillation occurs on lyocell fabrics that have been open width processed, but they still retain a soft handle with an imderlying bounce and resilience. 

M Performance Comparison—Indura Proban Cotton vs. Nomex, Westex Inc., Chicago, IH., 1991. 

A further group of whiteners was found in the acylamino (R,R ) derivatives (16) of 3,7-diaminodibenzothiophene-2,8-disulfonic acid-5,5-dioxide. The preferred acyl groups are aLkoxybenzoyls (72—74). These compounds give a greenish fluorescence and are relatively weak in comparison with stilbene derivatives on cotton however, they show good stabiUty to hypochlorite. 

Flame Retardants. The amount of research expended to develop flame-retardant (FR) finishes for cotton and other fabrics has been extremely large in comparison to the total amount of fabrics finished to be flame retardant. The extent of this work can be seen in various reviews (146—148). In the early 1960s, a substantial market for FR children s sleepwear appeared to be developing, and substantial production of fabric occurred. In the case of cotton, the finish was based on tetrakis(hydroxymethyl)phosphonium chloride (THPC) or the corresponding sulfate (THPS). This chemical was partly neutralized to THPOH, padded on fabric, dried under controlled conditions, and ammoniated. The finish was subsequently oxidized, yielding a product that passed the test for FR performance. This process is widely preferred to the THPOH—NH process. 

The behaviours of CD and ORD curves in the vicinity of an absorption band are collectively known as the Cotton effect after the French physicist A. Colton who discovered them in 189S. Their importance in the present context is that molecules with the same absolute conhguration will exhibit the same Cotton effect for the same d-d absorption and, if the configuration of one compound is known, that of closeiy similar ones can be established by comparison. 

Abscisin II is a plant hormone which accelerates (in interaction with other factors) the abscission of young fruit of cotton. It can accelerate leaf senescence and abscission, inhibit flowering, and induce dormancy. It has no activity as an auxin or a gibberellin but counteracts the action of these hormones. Abscisin II was isolated from the acid fraction of an acetone extract by chromatographic procedures guided by an abscission bioassay. Its structure was determined from elemental analysis, mass spectrum, and infrared, ultraviolet, and nuclear magnetic resonance spectra. Comparisons of these with relevant spectra of isophorone and sorbic acid derivatives confirmed that abscisin II is 3-methyl-5-(1-hydroxy-4-oxo-2, 6, 6-trimethyl-2-cyclohexen-l-yl)-c s, trans-2, 4-pen-tadienoic acid. This carbon skeleton is shown to be unique among the known sesquiterpenes. 

On the basis of research studies conducted mainly by American academics in American companies, it could be concluded that informal mentoring works better in that it appears to benefit the mentee more than formal mentoring. That is, academics including Kram (1983), Chao et al. (1992) and Ragins and Cotton (1999) found, in a number of comparisons between formal and informal mentoring, that irrformal mentoring appears to engender ... 

Ragins, B. R. and Cotton, J. L. (1999). Mentor functions and outcomes a comparison of men and women in formal and informal mentoring relationships. /. Appl. Psychol., 84, 529-50. 

Following acute oral toxicity from dosages ranging from 14 to 80 mg/kg, laboratory rats had earlier recovery of brain acetylcholinesterase levels than did feral cotton rats. Similar results were seen in a comparison of laboratory mice to feral mice (Roberts et al. 1988). 

Table 10.31 Comparison of hot mercerising with conventional cold mercerising of cotton [274,277]...

Table 10.32 Comparison of cold and hot mercerising processes for bleached and unbleached cotton and for modal fibres [275,277] ...

A comparison of the thus calculated with the measured specific rotations of the 0th- to 4th-generation dendrimers of this kind gave a close resemblance, with a curve, approaching asymptotically a limiting value (Fig. 26). It was also shown that the shape of this curve was independent of solvent, concentration and temperature. This was not the case when CD spectra of these dendrimers were compared (Fig. 27) in solvents such as CH2C12 and f-butyl methyl ether a constant rise of the Cotton effect was observed, which correlates with the increasing amount of benzene chromophores in the dendrimers. However, in the... 

Figure 2 Comparison of positive and negative Cotton effects.

Wakelin, J. H., Virgin, H. S., and Crystal, E. (1959). Development and comparison of two X-ray methods for determining the crystallinity of cotton cellulose. Journal of Applied Physics. 30,1654-1662. 

Additional tests are underway to more accurately determine relationships between data from the cotton-dust analyzer and data on card-room dust levels as measured with a vertical elutrlator. At present, the Information available as a basis for comparing the two dust-measurement techniques Is limited. The comparisons shown In Figure 4 were based on several analyses of samples from six cotton lots. Although limited In scope, the data Indicate the likelihood that the correlation between the two measurement techniques will be reasonably good. 

Table I is an attempt to compare the responses in lung function we observe with our naive subjects on exposure to cotton bract extracts with the responses reported in literature of both naive subjects and workers exposed to cotton dust. The comparison suffers from the fact that neither the exposure time or concentration nor the post-exposure time of FEV. q readings are standardized for the different investigating laboratories. The various cotton dusts or extracts are not standardized either and the airway constrictor potency varies with the dusts. Bracts also vary in their potency. We have observed variations in potency with harvest year from the same location (Lubbock, Texas).

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