phytochemical screening, antibacterial and cytotoxic activities of petroselinum crispum leaves grown in oman.petroselinum crispum belongs to the apiaceae family, is a well-known spice and vegetable. the essential oil obtained from the fruit has also strong action on the central nervous system. present study is designed to evaluate the phytochemical screening, antibacterial and cytotoxic activit...

Turnip crinkle virus is one of several single-stranded RNA plant viruses associated with defective interfering (DI) RNAs. A complete cDNA copy of a 344-base DI RNA (DI RNA G) was cloned downstream from a T7 RNA polymerase promoter. Transcripts synthesized in vitro were infectious when inoculated with helper virus on turnip plants. Studies of the infectivity of DI transcripts containing deletion...

In addition to regulating gene expression, RNA silencing is an essential antiviral defense system in plants. Triggered by double-stranded RNA, silencing results in degradation or translational repression of target transcripts. Viruses are inducers and targets of RNA silencing. To condition susceptibility, most plant viruses encode silencing suppressors that interfere with this process, such as ...

In Europe and the Mediterranean region, ‘Candidatus Liberibacter solanacearum’ (Lso) is associated with emerging diseases of Apiaceae crops, mainly carrot. Emergency measures for import carrot seed were set, requiring to be heat-treated at 50°C or tested as Lso-negative by PCR. The germination response heat treatment was assessed 24 cultivar hybrid lots. Ten parsley, five fennel, two celery lot...

Prefetching constitutes a valuable tool toward the goal of efficient Web surfing. As result, estimating amount resources that need to be preloaded during surfer's browsing becomes an important task. In this regard, prefetching can modeled as two-player combinatorial game (Fomin et al. (2014) [6] ), where surfer and marker alternately play on given graph (representing graph). During its turn, ch...