Hypersensitizing commercial panchromatic plates

Since ammonia, when added to the dye bath in preparing bathed plates, increases the sensitizing action of the dye, its action on commercial plates was investigated.In the course of the work three methods of sensitometry were used. Of these, one was used as a first qualitative test; the second, the spectrograph method, was used to study the effect of the ammonia on the sensitivity of the plate to each wave-length; the third, the Hurter and Driffield method, gives the absolute value of the speed of the plate.It was found that by bathing commercial panchromatic plates in a solution of 25 c.c. ethyl-alcohol, 75 c.c. water, and 3 c.c. of strong ammonia water (20 per cent. NH₃) for four minutes at 18° C. and drying rapidly, the speed to white light is increased 100 per cent. in nearly all cases, and the sensitivity in the red. extended one hundred or more Ångström units. The speed in the red is increased, in many cases, 400 per cent. If the plates be bathed without the alcohol (100 c.c. water, $\text{3}\text{1}\text{2}$ c.c. ammonia water) the speed is still more increased, but the plates should be used immediately after drying.Ordinary plates do not have their sensitivity appreciably changed. Most brands of orthochromatic plates are not improved, although one, the Cramer Trichromatic, showed the same increase as the panchromatic plate.     

中、高强度不同模式低氧训练对大鼠血清白细胞介素的影响

目的:探讨低氧环境和训练强度对免疫系统Th1/Th2平衡的影响.方法:200只大鼠按照氧环境(常氧、高住低练、高住高练)和训练强度(无、中和高)随机形成9种组合,中强度训练5周,高强度训练6周,取样前再分为安静组和定量运动组,共21组,放射免疫方法测定IL-2、IL-4.结果:中强度高住低练和高住高练后安静状态下IL-4较常氧中训组显著上调;高住高练和高住低练中训组一次中强度定量运动以及高住无训练组一次高强度定量运动后,IL-2/IL-4均较常氧相应组显著降低.提示中强度高住高练和高住低练、一次中强度高住高练课或一次不适应的低氧高强度运动,均可能扰乱机体Th1/Th2平衡.结论:5周中强度高住高练和高住低练后基础状态下、高住高练和高住低练中训组一次中强度运动后即刻以及高住无训练组一次不适应的高强度运动后即刻,细胞免疫功能受损,应给予关注;中强度高住高练和高住低练对IL的不利影响大于高强度训练.