Active conservation treatment

Barros L, Baptista P, Correia DM, Morais JS and Ferreira ICFR. 2007. Effects of conservation treatment and cooking on the chemical composition and antioxidant activity of Portuguese wild edible mushrooms. J Agric Food Chem 55( 12) 4781 —4788. 

Many investigations have focused on the efficacy of conservative treatment for improving both systemic and renal haemodynamics or for suppressing the activated hormone systems. The complexity of the pathogenesis of hepatorenal syndrome, which varies in each individual case, explains the differences in impact of the substances used. For this reason, there are pathogenetic... 

A survey of plastics-containing objects in the British Museum and the National Museum of Denmark showed that 1% of objects were actively deteriorating and were in immediate need of conservation, while 12% exhibited deterioration and required cleaning, stabilising and repair. All the acute objects contained cellulose nitrate, cellulose acetate, plasticised PVC or polyurethane foam. Most objects (60%) were defined as being of low conservation priority, that is, they were in a stable condition but needed some treatment such as cleaning. Only just over one quarter required no conservation treatment. In general, deterioration of plastic objects in museums is visible within 5-25 years of collection. 

Salts are passively absorbed into wooden objects in seawater, but some ions notably iron(III) are actively bound by cellulose, and high concentrations of iron corrosion products build up in consequence. As the wood becomes anoxic, these salts are converted into sulfides by the activity of SRB. A physical consequence of iron inclusions is that the wood microstructure becomes blocked making the object impermeable to future conservation treatments. Iron sulfide is unstable in the aerobic environment, and its oxidation can destroy the object (Figure 17). 

With the active conservation of waterlogged archaeological wood, the major problem is not that we do not have adequate treatment methods available, it is in recognising the serious limitations of these methods. However, those methods involving PEG offer the greatest flexibility and variability. 

Viscosupplementation via intra-articular hyaluronic acid injections is a conservative treatment modality to be used in conjunction with other conservative management modalities including activity modification, physical therapy, analgesics, nonsteroidal anti-inflammatories (NSAIDS), and intra-articular corticosteroid injections. It is only approved by the FDA for treating osteoarthritis of the knee. Off-label use has been reported for treatment of osteoarthritis affecting the earpometacarpal joints of the thumb, apophyseal joints of the lumbar spine, hip, ankle, and foot [1, 34, 40, 92, 101]. 

The majority of paediatric foot fractures heal well with conservative treatment. However, the change in trends of recreational activities, with some children now participating in motor sports, has meant increasing numbers of more severe foot injuries being seen in younger patients. Injuries in adolescence commonly take on similar patterns to those seen in adults. 

Decrea.sed energy consumption. As mentioned previously, methods of energy conservation are often interrelated and complementary to each other. Energy expenditures associated with the treatment and transport of waste are usually but not always reduced when the amount of waste generated is lessened, while at the same time the pollution associated with energy consumed by these activities is abated. 

---