High-molecular-weight components

High molecular weight components, which can be important in extmsion processes, can be accurately measured in steady shear experiments (34). 

Methods involving the addition of a third high-molecular weight component capable of reacting with at least one blend component. In this... 

The checkers found this fractional distillation to be simplified if the initial crude product was first subjected to a rapid short-path distillation under reduced pressure to remove the bulk of the dialkyl ated material and other high molecular weight components. 

An important issue in caramel applications is their compatibility with food. The compatibility is defined as the absence of flocculation, precipitation, and haze formation. These effects are the results of colloidal interactions between charged high molecular weight components of caramel and the food components thus the charge of caramel is essential for specific food applications. ... 

Steam extraction has been used for gasoline and diesel fuel. High-molecular-weight components of the diesel fuel cannot be removed easily, although a total removal of up to 91% is possible. When used to remove low-volatility compounds in a soil with a high percentage of clay, performance is expected to be ca. 85%. The mobile in situ steam extraction system can reduce VOCs in soils by more than 50% of their initial level. Based on pilot studies, the stationary steam extraction system is expected to have a 90% removal efficiency.54... 

Figure 21 shows the distribution of wine-derived antioxidants between apo B-containing lipoproteins and other high-molecular-weight components of... 

Asphaltenes A class of compounds that are part of the high-molecular-weight component of petroleum. They are relatively inert, have high boiling points, and have high degrees of unsaturation. 

The experiments presented above definitively established the fact the Lipson s HPD-forming procedure gives dimeric and trimeric porphyrin esters as the high-molecular weight component which is eminently better localized and retained in tumor cells and is responsible for most of the photodynamic activity associated with HPD. Mechanistically, the formation of ester linkage is not only understandable but expected as well. Under the alkaline condition employed in the synthesis of HPD, the nucleophilic substitution reaction illustrated in the following scheme is very similar to the... 

Besides fractions III, IV, and V, two other fractions, I and II have been described in preparations of human serum apo HDL, and HDL3. Although they are generally considered to be aggregates of the other fractions discussed above, these high-molecular-weight components have not yet been thoroughly studied. Such work is currently under way in this laboratory. 

Experimentally it is difficult to detect the occurrence of polymer shear degradation since concentration effects, increased peak dispersion, and ultrafiltration of high molecular weight components may also distort the peak profile or shift the distribution towards the low molecular weight region. Furthermore,... 

Zalkow. Water soluble high molecular weight components from plants with CS153 potent intraocular pressure lowering activity. Curr Eye Res 1987 6(7) ... 

F. Ewing. 5-Epi-aristolochene is a common precursor of the sesquiterpenoid phytoalexins capsidiol and debneyol. Phytochemistry 1989 28(3) 775-779. Borys, D. J., S. C. Setzer, L. J. Ling. CNS depression in an infant after the ingestion of tobacco A case report. Vet Hum Toxicol 1988 30(1) 20-22. Deutsch, H. M., K. Green, and L. H. Zalkow. Water soluble high molecular weight components from plants with potent intraocular pressure lowering activity. Curr Eye Res 1987 6(7) 949-950. 

Exposure-induced Reaction Products. Gel permeation chromatograms of EP, MRS, and EAP were measured before and after exposure at 20 /uC/cm2. The results are summerized in Figures 8 to 10. In the case of EP resist, shown in Figure 8, peaks 1, 2, and 3 represent epoxy novolac dimer, trimer, and tetramer, respectively. Peak 4 represents the main component of the poly(p-vinyl phenol) resin and peak 5 indicates the presence of exposure-induced high molecular weight components in the resin. 

The gel permeation chromatograms of MRS are shown in Figure 9, where peaks 1 and 2 represent the azide compound and the main component of poly(p-vinyl phenol), respectively. Peak 3 corresponds to a primary amine, which is one of the exposure-induced reaction products from the azide compound (14). Peak 4 indicates the same exposure-induced high molecular weight components as for EP. 

Prest,W.M., Jr., Porter,R.S. The effect of high-molecular-weight components on the viscoelastic properties of polystyrene. Polymer J. (Japan) 4,154-162 (1973). 

---