نتایج جستجو برای: sieve
تعداد نتایج: 4647 فیلتر نتایج به سال:
We introduce a variant of the large sieve and give an example of its use in a sieving problem. Take the interval [N ] = {1, . . . , N} and, for each odd prime p 6 √ N , remove or “sieve out” by all n whose reduction n(mod p) lies in some interval Ip ⊆ Z/pZ of length (p−1)/2. Let A be the set that remains: then |A| ≪ N log N , a bound which improves slightly on the bound of |A| ≪ N logN which re...
The ability of aphids to detect and find sieve tubes suggests that aphids receive cues for sieve-tube recognition by taking samples. Specific natural conditions such as pH value, sugar species and concentration, viscosity, and oxygen pressure may enable sieve-tube detection. We tested the preference of Megoura viciae and Myzus persicae for potential plant-borne orientation parameters in artific...
Summary Analysis of HIV-1 virions from participants infected in a randomized controlled preventive HIV-1 vaccine efficacy trial can help elucidate mechanisms of partial protection. By comparing the genetic sequence of viruses from vaccine and placebo recipients to the sequence of the vaccine itself, a technique called 'sieve analysis', one can identify functional specificities of vaccine-induce...
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