objective: helicobacter pylori is to blame for one of the most common chronic infections in humans and can cause peptic ulcer, gastritis, duodenitis and non-ulcer dyspepsia. developing a reliable test to detect the infection is of great importance. for a variety of reasons, the existing tests including the stool culture, biopsy, pcr, and urea breath test are not up to par. the pcr-elisa test is...

background: helicobacter pylori is the cause of serious diseases including gastric cancer and gastric mucosa–associated lymphoid tissue lymphoma.50% of world population is infected by this microorganism and it -based on epidemiologic studies - is mainly acquired during childhood . there is not enough evidence about prevalence of this infection in children and its risk factors so encourage us to...

Let t(n, d) be the minimum number t such that there are t of the n lattice points {(x1, . . . , xd) : 1 ≤ xi ≤ n} so that the ( t 2 ) lines that they determine cover all the above n lattice points. We prove that for every integer d ≥ 2 there are two positive constants c1 = c1(d) and c2 = c2(d) such that for every n c1n d(d−1)/(2d−1) ≤ t(n, d) ≤ c2n log n. The special case d = 2 settles a proble...