Sarit Avrani

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Prochlorococcus cyanobacteria are extremely abundant in the oceans, as are the viruses that infect them. How hosts and viruses coexist in nature remains unclear, although the presence of both susceptible and resistant cells may allow this coexistence. Combined whole-genome sequencing and PCR screening technology now enables us to investigate the effect of(More)
Phages are extremely abundant in the oceans, influencing the population dynamics, diversity and evolution of their hosts. Here we assessed the diversity and phylogenetic relationships among T7-like cyanophages using DNA polymerase (replication), major capsid (structural) and photosynthesis psbA (host-derived) genes from isolated phages. DNA polymerase and(More)
Bacteria and their viruses (phages) are antagonists, yet have coexisted in nature for billions of years. Models proposed to explain the paradox of antagonistic coexistence generally reach two types of solutions: Arms race-like dynamics that lead to hosts and viruses with increasing resistance and infection ranges; and population fluctuations between diverse(More)
Prochlorococcus is an abundant marine cyanobacterium that grows rapidly in the environment and contributes significantly to global primary production. This cyanobacterium coexists with many cyanophages in the oceans, likely aided by resistance to numerous co-occurring phages. Spontaneous resistance occurs frequently in Prochlorococcus and is often(More)
The Irano-Turanian distribution zone in the Levant crossroad is fragmented along different phyto- and zoogeographic and climatic regions, a relict of wider distribution in moister conditions during the Pleistocene and the Holocene. We examined the effect of the disjunct Irano-Turanian distribution among distinct mesic and xeric habitats on the genetic(More)
This paper reports on the channels through which warning of the impending disastrous cyclone of October-November 1981 was received and disseminated in the districts and villages of Gujarat in Northwest India. The process is slow and laborious, and efforts are in hand to improve the speed and efficiency of warning methods. Some of the problems likely to be(More)
Many bacteria, including the model bacterium Escherichia coli can survive for years within spent media, following resource exhaustion. We carried out evolutionary experiments, followed by whole genome sequencing of hundreds of evolved clones to study the dynamics by which E. coli adapts during the first 4 months of survival under resource exhaustion. Our(More)
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