Competition between two psychrotolerant bacteria was examined in glycerol-limited chemostat experiments subjected to non-steady-state conditions of temperature. One bacterium, a Brevibacterium sp. strain designated CR3/1/15, responded rapidly to temperature change, while a second, Hydrogenophaga pseudoflava, designated CR3/2/10, exhibited a lag in growth after a shift-down during a square-wave temperature cycle but not after a shift-up. The effects on competition and survival by these bacteria of both sine-wave and square-wave temperature changes between 2 and 16 degrees C over a 24-h cycle time were examined, as well as square-wave cycles over 12 and 96 h. The changing proportion of each bacterium in the chemostat was determined by plate counting at regular intervals. Under a sine-wave temperature cycle H. psedoflava outcompeted the Brevibacterium sp., but under square-wave temperature cycles the two bacteria coexisted because the lag by H. pseudoflava after the temperature shift-down favored the faster-responding Brevibacterium sp. The two bacteria thus exhibited different survival strategies, with H. pseudoflava adapted to effective competition under steady-state conditions and the Brevibacterium sp. adapted to rapid adaptation and survival in a changing environment. The degree of perturbation of the bacteria, expressed as a temperature challenge index (delta temp/delta time), was greater under a square-wave temperature cycle than under a sine-wave cycle of equivalent amplitude and frequency, and higher-temperature challenge favored the Brevibacterium sp. A computer model was developed to examine competition between the bacteria in transient environments. The frequency of the temperature cycle influenced competition, as with a longer cycle (96 h) the significance of the lag by H. pseudoflava decreased compared with that of a 24-h cycle, and H. pseudoflava predominated in a mixed culture with a 96-h cycle. The shift-down lag by H. pseudoflava, during which it adapted to low temperature, disadvantaged it in a changing temperature environment, but at a short cycle time (12 h) this disadvantage was countered by the incomplete loss of low-temperature adaptation between cycles and thus the carryover of some low-temperature adaptation. Also, it was demonstrated that, as well as consideration of the effect of temperature changes on inducing lags in growth, the loss of adaptation to low temperature between cycles had to be taken into account in the computer model if it was to reproduce the trends in the experimental data.
Cold polar marine species have very slow embryonic and larval development rates. Antarctic echinoids, bivalve molluscs and brooding gastropods develop up to 12 times slower than temperate and tropical species, departing from Arrhenius relationships and outside the normal Q 10 of 2–3 associated with 10 °C reductions in biochemical reaction rates. The slowing of development at temperatures around 0 °C has been reported previously to be much greater than for other parts of the global marine temperature range. Here we spawned and reared embryos and larvae of the Antarctic limpet Nacella polaris at 0.6 °C to the post-torsional veliger stage. Spawned eggs were 221 µm in diameter. Development rates were three times slower than any previously reported for patellogastropod limpets, with first division at 2.5 h post-fertilisation, the gastrula stage being reached after 55 h, hatching occurring after 70–75 h and the trochophore stage being reached after around 100 h. The marked slowing of development around 0 °C matches that previously reported for other polar taxa. This supports the hypothesis that there is a cold marine physiological transition to markedly slower physiological rates at temperatures near 0 °C. The transition is especially apparent here for development, but has also been reported for growth, both of which involve significant protein synthesis.
Increasing carbon dioxide causes cooling in the upper atmosphere and a secular decrease in atmospheric density over time. With the use of the Whole Atmospheric Community Climate Model with thermosphere and ionosphere extension (WACCM‐X), neutral thermospheric densities up to 500 km have been modelled under increasing carbon dioxide concentrations. Only carbon dioxide and carbon monoxide concentrations are changed between simulations, and solar activity is held low at F10.7 = 70 throughout. Neutral density decreases through to the year 2100 have been modelled using four carbon dioxide emission scenarios produced by the Intergovernmental Panel on Climate Change (IPCC). The years 1975 and 2005 have also been simulated, which indicated a historic trend of ‐5.8% change in neutral density per decade. Decreases in the neutral density relative to the year 2000 have been given for increasing ground‐level carbon dioxide concentrations. WACCM‐X shows there has already been a 17% decrease in neutral densities at 400 km relative to the density in the year 2000. This becomes a 30% reduction at the 50:50 probability threshold of limiting warming to 1.5°C, as set out in the Paris Agreement. A simple orbital propagator has been used to show the impact the decrease in density has on the orbital lifetime of objects travelling through the thermosphere. If the 1.5°C target is met, objects in LEO will have orbital lifetimes around 30% longer than comparable objects from the year 2000.
Craft bakers including Prudens of Hertfordshire, Campbell’s of Crieff in Perthshire and JW Rose of Sheffield have signed up to take part in this year’s National Doughnut Week.Warings of Tilehurst, Berkshire, Birmingham College of Food and Technology and the Hot Bread Shop of St Anne’s, Alderney, will also be taking part in the annual fundraising week.In National Doughnut Week, sponsored by BakeMark UK, craft bakers raise funds for The Children’s Trust, a national charity that provides specialist care and rehabilitation for children with multiple disabilities.Bakers who register by 6 April, will receive enough doughnut concentrate to make more than 900 doughnuts.To register, contact Christopher Freeman at Dunns Bakery on 020 8340 1614 or email [email protected]
In 2015, Lettuce blew funk fans away with their new album release, Crush. The album featured everything we love about Lettuce in one place, the high powered energy and mind-altering psychedelia, dripping with the band’s patented brand of sexy funk jamming. As Lettuce continues to crush in the live setting, the band has shared a new otherworldly video today that tells the story of their whole album.The new video has it all – spaceship parties, traveling through the universe, and so much more. Of course, it’s all fueled by the cosmic grooves of Lettuce and company. The band is on a roll, never sounding fresher.Watch the new video for Crush, streaming below via the Billboard premiere. For fans of Lettuce, you won’t want to miss Eric “Benny” Bloom, Jesus Coomes, Adam Deitch, Adam “Shmeeans” Smirnoff, and Ryan Zoidis, performing alongside members of Dead & Company, The String Cheese Incident, The Disco Biscuits, Joe Russo’s Almost Dead, Dopapod, Soulive, Medeski Martin & Wood, Snarky Puppy and so many more at the second annual Brooklyn Comes Alive – in the heart of Williamsburg – with over 50 artists spanning three venues in just one day: October 22nd. [Get tickets here]
India is poised to join the list of countries suffering from a dual burden of both infectious and chronic non-communicable diseases, many of which have their roots in diet and nutritional status. While poor maternal and child health is marked by high rates of anemia, undernutrition, and infectious diseases, obesity and diabetes are also rising in incidence. The need for nutrition researchers in the country is great, but few options exist for graduate-level training.For the past four years, researchers at Harvard School of Public Health (HSPH) and Tufts University have been working to bridge that gap through the Bangalore Boston Nutrition Collaborative (BBNC), a program which includes educational exchanges, distance learning, and a two-week course in nutrition research methods. The most recent course was held January 21-February 1, 2013 at St. John’s Research Institute in Bangalore.The course, which is held annually, provides substantive knowledge and methodological skills in nutrition research, with topics including research ethics, nutritional epidemiology, biostatistics, survey design, proposal development, and body composition analysis. Junior faculty and students from dozens of institutions throughout India attended the most recent session, in addition to several attendees from Uganda, Nepal, and other countries.“The skills we teach help fill a gap in the students’ training,” said Christopher Duggan, associate professor in HSPH’s Department of Nutrition, who leads the program. “The vast majority of them have gone on to write a paper, submit a research grant, or otherwise advance in their academic home institution using what they’ve learned.” Read Full Story
Why bother with 6AM conference calls and 14-hour flights? Because we are at the early beginnings of an era where imaginative thinkers are changing everything in sight – from thermostats to software.I’m talking specifically about design shifts in mobile enterprise software, the likes of which one day we will look back upon with awe. These past few weeks, I saw it in spades, as we launched Syncplicity’s mobile apps.What’s different now?In the first wave of mobile software development, incremental innovation simply brought old functionality to a new device. In the process, fundamentals were often missed.How frustrating to see a document for review on your mobile screen, yet be unable to edit it? Design was simply your desktop basic functionality, brought awkwardly to your smartphone.The second wave brought mobile on par with the desktop. Functionality was refactored amidst the new memory and added capabilities of our favorite gadgets. Fewer and fewer R&D teams argued if a mobile version of their software was next.But such design was still a parallel effort, a passenger alongside the driver of monolithic application development. SharePoint is now in the cloud? Interesting, but it doesn’t solve my problems.The reality is that mobile itself is the new design baseline, cleanly isolated and independent of any lingering PC notions. Mobile is the superset form factor, under which all functionality must be derived and considered.This third wave of design is what ignites our imagination and makes us want to drive 24/7 to brilliant new productivity solutions.Once we unleash imagination, it’s only a matter of time before the way we think about “productivity” will change in thrilling ways. Remember what “taking pictures” used to mean?It was a time-consuming and disparate routine of carrying camera equipment with you, buying film, configuring the camera settings, and at last, waiting to process the film.By rethinking “taking pictures” as “sharing moments,” however, those inefficiencies not only disappeared, but new worlds opened up. Ubiquitous devices brought image capture to the masses. Apps made photos easy and addictive to share. And social created a place where all the people to share photos with are constantly present.The same thing will occur as we rethink “productivity” from the mobile perspective. Many attributes of mobile are barely tapped today: proximity, location and personalization, for example.And already we see new segments quickly embracing the third wave as inklings of what’s to come:retail workers processing credit card payments without the customer ever waiting in line,flight attendants logging meal orders as they walk the aisle with their devices,citizens never bothering with the red tape to turn on a “land line” for making phone calls.It’s time to think: how else can we eliminate knowledge workers’ wasted time, speed their transactions, and heighten their ability to share value?Yes, mobile itself offers rich new design inspiration. But imaginative designers will rethink it all – the meaning of “productivity” included.
This Saturday at 8 p.m. in Leighton Concert Hall of the DeBartolo Performing Arts Center, the Undertones, a subset of the Notre Dame Glee Club, will present the ACA, an all-a cappella concert that will feature collaborations with a cappella singing groups such as Indiana University’s Another Round and the Tufts University Beelzebubs. Photo courtesy of Billy Raseman Undertones president, senior Billy Raseman, said inspiration for the show stemmed from the recent surge in the popularity of a cappella singing.“With shows like NBC’s ‘The Sing-Off,’ ‘Glee’ and the movie ‘Pitch Perfect,’ the popularity of a cappella music has shot through the roof, and with this newfound popularity, the genre is changing faster than ever,” Raseman said. “We wanted the chance to see what other college groups are doing and show them what Notre Dame has to offer to the a cappella community. That’s where ACA was born.”Raseman said the groups began developing the concept of the concert in spring 2013.“We have been planning this since August and we’ve been talking about the idea since the spring semester of last year,” Raseman said. “Finding the venue, inviting groups, making a marketing plan, buying new attire for the group and all the various other work that has gone into ACA has been a year-long process.”The Undertones extended invitations to participate to singing groups with prestige, Raseman said. He said member junior Jamie Towey judged prestige through research of collegiate a cappella groups online.“Jamie Towey, our music director, decided which groups to invite,” he said. “There were some groups that we invited based off of their reputation for excellence — groups like Indiana University’s Another Round and the Tufts Beelzebubs have shaped college a cappella into what it is today.“Next, Jamie looked to the results of the ICCA — International Championship of Collegiate a Cappella — competitions from the past few years and scoured YouTube videos searching for the best. We found a lot of innovative groups, but the G-Men from Michigan and the Vanderbilt Melodores stood out among the rest.”The show will feature a diverse range of music and performance from each a cappella group, Raseman said.“There is a huge range of genres that are going to be covered, including hip hop, folk/country, electronic, R&B, rock, pop, and there may even be a boy band song in there,” Raseman said. “… As far as movement [on stage] goes, some groups may just sing in an arc and let their songs speak for themselves, while others may have intricate choreography to have an added layer to their performance.”Raseman said the show will offer a cappella and music fans an excellent show. He said he is most excited for the show’s finale.“I can’t wait for the last song of the concert where we will all get to share the stage,” Raseman said. “This song will feature soloists from each of the groups and will add a unifying element to the performance.“All the groups coming are going to be phenomenal, and each one brings something new to the table,” he said. “I am not only excited to hear their sets, I can’t wait to talk to each group afterward and learn how they operate.“We all come from completely different backgrounds so it’ll be an awesome learning experience for everyone involved and just a lot of fun.”Tags: a cappella, ACA, DPAC, Music, Undertones
Share:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to email this to a friend (Opens in new window) Credit pixabay.comNEW YORK — The number of physical books sold dropped 10 percent from the previous week, the latest sign of the effect of the coronavirus on the publishing industry.NPD BookScan , which tracks around 85 percent of physical sales, reported big drops in children’s fiction and adult nonfiction books. The biggest gains were in nonfiction books for kids, notably workbooks purchased by parents whose children are now home from schools that have been closed.The BookScan numbers were released at a time when tours were being called and some of the country’s top independent sellers, among them Powell’s Books in Portland, Oregon, and the Tattered Cover in Denver, were laying off employees. Barnes & Noble has been cutting back its hours and closing some stores, but otherwise is reporting “relatively strong sales considering the situation, both in our stores and online, especially of kid’s books and fiction, including notably home study aids,” according to a statement Wednesday.Such traditional spring events as the PEN World Voices festival and the Mystery Writers of America awards dinner have been canceled. And the country’s largest publisher, Penguin Random House, announced Wednesday that it would not attend the BookExpo national convention in late May in Manhattan. A spokeswoman for BookExpo said an announcement on the convention’s status would be made early Thursday. For most people, the new coronavirus causes only mild or moderate symptoms, such as fever and cough. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia.
Related Shows Christian Borle(Photo: Bruce Glikas) Falsettos View Comments Tickets are now on sale for the eagerly anticipated Broadway revival of Falsettos. Led by two-time Tony winner Christian Borle, co-book writer James Lapine will direct the revival, which is set to begin previews on September 29 at the Walter Kerr Theatre. Opening night is scheduled for October 27; the limited engagement will run through January 8, 2017.The musical by Lapine and William Finn follows Marvin, who struggles to create a “tight knit family” out of his eclectic array of core relationships, including his ex-wife, his new boyfriend, his adolescent son, his psychiatrist and his neighbors. Amidst a series of life changes, he is forced to reckon with his own views on love, responsibility and what it means to be a man.The starry cast will also include Stephanie J. Block, Andrew Rannells, Brandon Uranowitz, Tracie Thoms, Betsy Wolfe and Anthony Rosenthal. Show Closed This production ended its run on Jan. 8, 2017