Just two Delta IV Heavy missions remain now, both of which will launch from Florida.
and joined the team in 2010. He primarily covers exoplanets, spaceflight and military space, but has been known to dabble in the space art beat. His book about the search for alien life,"Out There," was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D.
in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.Get breaking space news and the latest updates on rocket launches, skywatching events and more!Receive email from us on behalf of our trusted partners or sponsorsThere was a problem.
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Watch a huge Delta IV Heavy rocket launch a US spy satellite on its final West Coast flight live todayWatch powerful Delta IV Heavy rocket launch US spy satellite Saturday
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'Serious health risks': Industry experts warn of contaminants in marijuana alternative delta-8At least a dozen states have banned delta-8, including Colorado, Montana, New York, and Oregon. But manufacturers call concerns unfounded and say they’re driven by marijuana businesses trying to protect their market share.
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Frontiers | The transcriptional regulator CtrA controls gene expression in Alphaproteobacteria phages: Evidence for a lytic deferment pathwayPilitropic and flagellotropic phages adsorb to bacterial pili and flagella. These phages have long been used to investigate multiple aspects of bacterial physiology, such as the cell-cycle control in the Caulobacterales. Targeting cellular appendages for adsorption effectively constrains the population of infectable hosts, suggesting that phages may have developed strategies to maximize their infective yield. Brevundimonas phage vB_BsubS-Delta is a recently characterized pilitropic phage infecting the Alphaproteobacterium Brevundimonas subvibrioides. Like other Caulobacterales, B. subvibrioides divides asymmetrically and its cell cycle is governed by multiple transcriptional regulators, including the master regulator CtrA. Genomic characterization of phage vB_BsubS-Delta identified the presence of a large intergenic region with an unusually high density of putative CtrA-binding sites. A systematic analysis of the positional distribution of predicted CtrA-binding sites in complete phage genomes reveals that the highly skewed distribution of CtrA-binding sites observed in vB_BsubS-Delta is an unequivocal genomic signature that extends to other pili- and flagellotropic phages infecting the Alphaproteobacteria. Moreover, putative CtrA-binding sites in these phage genomes localize preferentially to promoter regions and have higher scores than those detected in other phage genomes. Phylogenetic and comparative genomics analyses show that this genomic signature has evolved independently in several phage lineages, suggesting that it provides an adaptive advantage to pili/flagellotropic phages infecting the Alphaproteobacteria. Experimental results demonstrate that CtrA binds to predicted CtrA-binding sites in promoter regions and that it regulates transcription of phage genes in unrelated Alphaproteobacteria-infecting phages. We propose that this focused distribution of CtrA-binding sites reflects a fundamental new aspect of phage infection, which we term lytic deferment. U
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The good, the bad and the ugly of PFD airfare dealsThis year's airfare specials from both Alaska Airlines and Delta are enticing, but beware of blackouts and make sure you’re aware of terms of the specific tickets.
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Adams Avenue Street Fair returns this weekend -SAN DIEGO (KUSI) – The 40th annual Adams Avenue Street Fair will be in Normal Heights Saturday, Sept. 24 from 10 a.m. to 10 p.m. and Sunday 10 a.m. to 6 p.m. The Adams Ave. event is the largest FREE two-day music festival in Southern California. The headliners this weekend include the Beat Farmers, Roots-Rockers, the Delta Bombers, and Starcrawler....
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