Cold stress controlling

Mink 1.0 mg/kg diet daily for 4 months then every other day for 4 months alternating with control diet High mortality after 4 months when subjected to cold stress significant placental transfer to the fetus 9... 

The effects of cold stress should also be considered where appropriate. At a critical level it can lead to increasing lethargy and apathy, and poor control of movement. There are obviously areas and jobs where cold stress is a problem. This is a product of air temperature and airflow (the wind chill factor). Jobs where this is a concern include ... 

Measurement and Control The TLVs for cold stress and the windchiU index can be used to evaluate the cold environment. The windchiU index expresses the cooling power of wind on exposed skin as an equivalent temperature. The human body senses cold as a result of both air temperature and wind velocity. 

Other Control Measures Engineering controls can be used to reduce cold stress in the mining enviromnent. These include general or spot heating to increase workplace temperatures warm air jets, radiant heat, or contact with warm plates to keep hands warm work area shielding from air... 

Admiralty Brass and Naval Brass are 30 and 40% zinc alloys, respectively, to which a 1% tin addition has been added. Resistance to dezincification of Cu—Zn alloys is increased by tin additions. Therefore, these alloys are important for thein corrosion resistance in condenser tube appHcations. In these, as weU as the other higher zinc compositions, it is common to use other alloying additives to enhance corrosion resistance. In particular, a small amount (0.02—0.10 wt %) of arsenic (C443), antimony (C444), or phosphoms (C445) is added to control dezincification. When any of these elements are used, the alloy is referred as being "inhibited." For good stress corrosion resistance, it is recommended that these alloys be used in the fiiUy annealed condition or in the cold worked plus stress reHef annealed condition. 

Where these valves are used, the time available to warm up the pipe work will be known, as it is set on the valve control. In other cases, details of the start-up procedure must be known so that the time may be estimated. Thus boilers started from cold may be fired for a short time, shut off for a period while temperatures equalize, and then fired again. Boilers may be protected from undue stress by these short bursts of firing, which extend the warm-up time and reduce the rate at which the condensate in the mains must be discharged at the traps. 

Hi) Poly amines. In many respects the role of poly amines in plant functioning is still mysterious after many years work. They are almost certainly involved in the control of growth and development through their interactions with nucleic acids and membranes (Smith, 1985). There is increasing circumstantial evidence for their involvement, especially of putrescine, in plant responses to a wide range of stresses including pH, Mg deficiency, osmotic shock, cold, SO2 pollution, and cadmium and ammonium toxicity (Smith, 1985). It remains to be determined, however, how, and indeed whether, putrescine accumulation in response to these diverse stresses is beneficial. 

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