The drinking water of this province is supplied from Zayande-rood River which is considered as surface water. It is probable that this water is contaminated with industrial and urban sewerage at the margin of this river. To our knowledge, except refinement (filtering and chlorine dissipate), there are no hygienic activities (for example radiation on drinking water) for control the quality of drinking water in Isfahan. Also, this river is the only watercourse of companies producing bottled drinking water in this province. Therefore, one of the sources of microbial contamination (such as Escherichia coli, Salmonella spp., and Vibrio cholerae) in this area is water. Besides, most of hospitals, especially at the central part of Isfahan, use from this water and it is important to free from any pathogens. In this study, total of 448 tap-water and bottled drinking water were examined over a period of 6 months, from July 2010 to December 2010. Totally, 144 tap-water samples were collected from four different geographical regions of Isfahan province. For each region, 36 samples were collected in 1000 mL glass bottles containing 0.5 g of sodium thiosulphate for dechlorination of the water. Also, 304 bottled drinking water were purchased from a five different companies, which use the same water system, the day that the experiment was conducted.
The .223 Remington cartridge inspired an international tendency toward relatively small-sized, lightweight, high-velocity military service cartridges that allow a soldier to carry more ammunition for the same weight compared to their larger and heavier predecessor cartridges, have favourable maximum point-blank range or "battle zero" characteristics, and produce relatively low bolt thrust and free recoil impulse, favouring lightweight arms design and automatic fire accuracy.[10][15][16] Similar intermediate cartridges were developed and adopted by the Soviet Union in 1974 (5.4539mm)[17] and by the People's Republic of China in 1987 (5.842mm).[citation needed]
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The U.S. Marines adopted the Mk318 in early 2010 due to delays with the M855A1. This was a temporary measure until the M855A1 was available for them, which occurred in mid-2010 when the Army began to receive the rounds. Both the Mk318 and M855A1 weigh the same and have similar performance, and both have better performance than the M855 against all targets. SOCOM spent less money developing the Mk318 and it is marginally better than the M855A1 in some situations, but costs more per round. The Army spent more developing the M855A1 which performs as well or nearly as well as the Mk318, but is cheaper per round and has the advantage of being lead-free. While SOCOM constantly looks for better equipment, the Army and Marines have far more troops to supply and buy more ammunition than SOCOM.[55]
The M855A1 Enhanced Performance Round (EPR) was introduced in June 2010. It features a lead-free 62 grain (4.0 g) projectile with a solid copper core, and is tailored for use in rifles with shorter barrels such as the M4 carbine. It provides more consistent performance compared to the M855.[112]
While deployed in a combat zone outside the continental United States, The Institutes will provide free exams and study materials to full-time active-duty members of the United States military. For eligibility, we require proof of duty status and proof of deployment orders. 2ff7e9595c
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