We consider a modiication of the pigeonhole principle, MPHP, introduced by Goerdt in 7]. Using a technique of Razborov 9] and simpliied by Impagliazzo, Pudll ak and Sgall 8], we prove that any Polynomial Calculus refutation of a set of polynomials encoding the MPHP, requires degree (log n). We also prove that the this lower bound is tight, giving Polynomial Calculus refutations of MPHP of optim...

Mangroves acted as sinks of terrestrial pollutants, but the occurrence and contamination rare earth elements (REEs) in urban mangroves lacked systematic evaluation. In rapidly developing Shenzhen, China, four typical were selected to determine REEs mangroves, including Baguang mangrove (BGM) Futian (FTM) featured with ecological preserve central business district, respectively; Xixiang (XXM) Sh...

Contamination of the external surface of anticancer drug vials supplied to hospital pharmacies has been recognized as a potential health hazard. The aim of this study was to investigate the levels of contamination on the exterior surface of vials containing platinum anticancer drugs in Japan. Platinum contamination on the exterior surface of vials containing cisplatin or carboplatin was examine...

The current paper determines heavy metals in sediments of six freshwater wetlands of greater Dhaka district from November 1999 to September 2000. The sampling took place in summer, rainy season, and winter, wherein for each season five soil samples were collected from the wetland at a depth of 0 – 15 cm. To assess the status of heavy metal pollution in the sediments, geo-accumulation factor (Ig...

The current paper determines heavy metals in sediments of six freshwater wetlands of greater Dhaka district from November 1999 to September 2000. The sampling took place in summer, rainy season, and winter, wherein for each season five soil samples were collected from the wetland at a depth of 0 – 15 cm. To assess the status of heavy metal pollution in the sediments, geo-accumulation factor (Ig...

STUDY DESIGN Prospective experimental study. PURPOSE To evaluate bacterial contamination during surgery. OVERVIEW OF LITERATURE The participants of surgery and ventilation system have been known as the most significant sources of contamination. METHODS Two pairs of air culture blood agar plate for G(+) bacteria and MacConkey agar plate for G(-) bacteria were placed at 3 different location...