Degradation case studies

Boekel, M.J.S., Kinetic modeling in food science a case study on chlorophyll degradation in olives, J. Sci. Food Agric., 80, 3, 2000. 

Ryan C, Berry N, Joshi N. Quantifying the causes of deforestation and degradation and creating transparent REDD baselines a method and case study from central Mozambique. Applied Geography, 2014. 53 pp. 45-54. doi 10.1016/j.apgeog.2014.05.014... 

Koch M (2000) Geological controls of land degradation as detected by remote sensing a case study in Los Monegros, north-east Spain. Int J Remote Sens 21 457 173... 

I can thank just a few of my colleagues and students who helped develop the case studies in this book. John Yecko and William Roy of the Illinois State Geological Survey first modeled degradation of the injection wells at Marshall, Illinois. Rachida Bouhlila provided analyses of the brines at Sebkhat El Melah, Tunisia. 

D.C. Wright, Failure of Plastics and Rubber Products - Causes, Effects and Case Studies Involving Degradation, Rapra Technology Limited, Shawbury, UK, 2001. 

C. Galindo, P. Jacques and A. Kalt, Photochemical and photocatalytical degradation of an indigoid dye a case study of acid blue 74 (AB74). J. Photochem. PhotobioLA Chem., 141 (2001) 47-56. 

M. Vautier, C. Guillard and J.-M. Herrmann, Photocatalytic degradation of dyes in water case study on indigo and indigo carmine. J. Catal., 201 (2001) 46-59. 

Because weathering and other abiotic processes simultaneously occur and contribute to changes in the concentrations of PAHs in the field, laboratory microbial degradation and the determination of a target transformation metabolite appear to be useful to evaluate the possibility of microbial transformation in any contaminated environment. Such case studies follow ... 

The root cause of dark color streaks in gray-colored parts can sometimes be more difficult to determine since both poorly dispersed pigments and resin degradation products can be the source. In these cases, removing the color masterbatch from the process and operating with just the natural resin will allow the root cause to be identified. That Is, If the dark color streaks still occur in the product after the color masterbatch is removed, then the source of the problem is related to resin degradation. Two case studies are shown in Section 11.12 to illustrate these defects. 

Many of the contamination defects that typically occur in extrusion processes can also occur in injection-molded parts. The most obvious defects are caused by foreign material contamination, resin degradation, and surface defects known as splay. The next sections provide case studies where contamination caused defects in injection-molded parts. 

Extrusion processes are often rate limited by motor power or torque, discharge temperature, or the melting capacity of the screw. Other root causes associated with the design of the screw can limit rates as shown in previous sections. The problems, however, are typically associated with other defects such as flow surging or resin degradation. Chapters 11 and 12 discuss process defects associated with resin degradation and flow surging, respectively. Rate limitations due to inadequate motor power and torque are common problems for commercial plants. Two case studies are presented in the next sections that show rate limitations due to the lack of torque and motor power. 

Lange F, Comelissen S, Kubac D, Sein MM, von Sonntag J, Hannich CB, Golloch A, Heipieper HJ, Moder M, von Sonntag C (2006) Degradation of macrolide antibiotics by ozone a mechanistic case study with clarithromycin. Chemosphere 65 17-23... 

Surface-catalyzed degradation of pesticides has been examined in the context of research on contaminant-clay interactions. Such interactions were observed initially when clay minerals were used as carriers and diluents in the crop protection industry (Fowker et al. 1960). Later specific studies on the persistence of potential organic contaminants in the subsurface defined the mechanism of clay-induced transformation of organophosphate insecticides (Saltzman et al. 1974 Mingelgrin and Saltzman 1977) and s-triazine herbicides (Brown and White 1969). In both cases, contaminant degradation was attributed to the surface acidity of clay minerals, controlled by the hydration status of the system. 

---