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VOLUME 138, ISSUE 23 | THURSDAY, APRIL 16, 2020
THEAGGIE.ORG
UC DAVIS RESEARCHERS STUDY THE ROLE OF SPEECH AEROSOLS IN CORONAVIRUS TRANSMISSION Superemittors may be responsible for significant viral spreading
The CoHo operating before the shelter-in-place went into effect. (Justin Han / Aggie).
STUDENTS GO WITHOUT PAY DURING SPRING QUARTER
Unitrans, CoHo, Student Housing & Dining, Campus Recreation try to support students, cannot offer more than a certain amount of leave BY JANELLE MAR I E SALANGA campus@theaggie.org
Since BIS 2B already has established course concepts outlined for each laboratory, Li worked closely with the course coordinator to make sure the concepts are met in the videos. Like with chemistry labs, Li said she worries students may not develop the necessary skills they normally would by physically going to lab. “What is lost is likely not knowledge, but experience,” Li said. “For instance, students will understand the concept of forming a hypothesis. However, since they are not able to do the lab experiments themselves, they will have less practice forming those hypotheses and fewer opportunities to discuss what makes a good hypothesis.” Unlike chemistry, some BIS 2B lab sessions may include a do-it-yourself component for students to complete at home. Usually in biology labs, tools and specimens are provided to students, so Li and other faculty are trying to include hands-on components to labs as much as possible. Most experiments, however, will only be put into an observation context through video. Similarly, in California Floristics and Angiosperms Systematics and Evolution, Dan Potter, a professor in the Department of Plant Sciences, is hoping to have students work with real flowers that they collect on their own, making it closer to the usual lab experience. “Normally, we have a lot of fresh plant material that we bring into the labs for the students to look at,” Potter said. “So it’s a very hands on lab in a normal year.” Zoom video meetings will be held for the labs in these plant science classes. Images of flowers will be integrated into the videos instead of having students examine only plant material. Usually, the labs have been five hours, but this quarter they will be split into two groups that meet for two hours each. Due to the new format and shorter laboratory period, this course will cover less material. “We usually in both of these courses cover a whole lot of different plant families and we just decided to scale back on that a little bit so there’s not quite as many different things that they have to be trying to learn without being able to see the fresh material,” Potter said.
Buildings like the ARC, the CoHo and the Peet’s locations on campus have closed for Spring Quarter, and the students who staff those areas have lost a source of income. Unemployment is a repercussion of the COVID-19 pandemic — and nationwide unemployment is now at 13%. Third-year mechanical engineering major Kayla Flores, who was a supervisor for Peet’s Coffee before the campus closure, said Student Housing & Dining provided her with little notice about the location’s status for Spring Quarter. “During finals week, Student Housing & Dining Services were still optimistic about staying open, but I knew they wouldn’t,” she said. “Then they emailed us at the start of the quarter saying that they would be closed.” At the time, Flores didn’t know that the university would be offering Emergency Administrative Leave (EAL), which she called the “UC Davis version of unemployment.” She now works at Food 4 Less, often for 9-hour shifts, while living at home. “I needed consistent income,” she said. “I don’t get enough parent help or financial aid, and I still have to pay for rent, my phone bill and my car insurance.” EAL is being offered throughout the UC system as a way to compensate students who cannot work remotely. It is calculated based on the number of hours students have worked in the past. Work-study students who are affected by the pandemic can still be paid with work-study funds, but their employers are not obligated to keep them employed during the temporary closure. UC Davis said students who cannot work remotely and are currently on work-study will be paid until their funds are depleted. “We encourage student staff to recommend projects in which their perspective is uniquely valuable in these unusual circumstances,” an FAQ on the UC Davis website reads. Many of the suggestions offered revolve around social media curation and website upkeep. Employers themselves are seeking ways to keep students working remotely. ASUCD Business Manager Greg Ortiz called the process “turning stones over multiple times.” Ortiz said ASUCD is keeping the Bike Barn open for appointments only. He’s also talked with the CoHo about offering delivery services and with Unitrans to see if they can pick up donations to The Pantry from the Yolo County Food Bank. Deb Johnson, the director of recreation at Campus Recreation, said via email there were around 200 students — out of approximately 650 Campus Recreation employees — who elected to continue their work at home during Spring Quarter. Johnson said these students are “developing online classes on a variety of wellness topics” for other students to participate in at home. “Students who are not teaching or leading programming have the opportunity to help create staff training videos, work on our risk management procedures, update and rewrite staff training manuals and help the team stay current with the constant fluid nature of our work right now,” Johnson said. Employers are also trying to offer work opportunities to students who remain in Davis. Ortiz said CoHo and Unitrans employees were put to work making face shields for the UC Davis Medical Center. And Johnson said Campus Recreation employees are working on a similar project. Darin Schluep, CoHo director, said he has notified employees that they can provide culinary support at the UC Davis Medical Center. “I am sending weekly emails via our employee listservs with resources and relevant information from the campus,” he said. “We [...] are hoping that there will be more opportunities for our employees to earn money as we continue our spring quarter closure.” Johnson said student employees at the Equestrian Center or Craft Center who chose to keep working during Spring Quarter remain on campus.
LABS on 11
COHO on 11
KATH E R I N E F R A N KS / AGGI E
BY D I N A G A L L AC H E R science@theaggie.org New research from UC Davis shows that certain speech patterns and key individuals, called superemittors, may be contributing to the spread of coronavirus more than previously thought, according to an editorial published in the Aerosol Science and Technology Journal on April 3. “There are different [methods] of infectious disease transmission [such as] through direct contact with an infected individual or contact with infected surfaces which we call fomites,” said Sima Asadi, a chemical engineering doctorate candidate. “Another route of transmission is through air. [We call] this method airborne infectious disease transmission.” Although previous research claims that COVID-19 is spread primarily through direct contact and inhalation of infectious aerosol particles that are sneezed and coughed into the air, research by Professor Ristenpart from the Department of Chemical Engineering indicates otherwise. “It looks like SARS-CoV-2 is transmitted at least in part by aerosol particles, because there is quite a lot of evidence now for transmission from asymptomatic individuals, people who are not coughing or sneezing,” Ristenpart said. “Asymptomatic and pre-symptomatic individuals, by definition, do not cough or sneeze to any appreciable extent,” according to the Aerosol Science and Technology article co-authored by
Ristenpart and Asadi. Their research suggests that these asymptomatic individuals are largely responsible for spreading the virus through their everyday speech patterns. “I think something that a lot of people don’t realize is that when you breathe or when you speak, you are actually emitting a pretty large number of what’s known as expiratory aerosol particles,” Ristenpart said. “These are very tiny droplets. As soon as you exhale them, they evaporate and they form [infectious particles] that are about one micron in diameter. For contrast, a human hair is about 50-100 microns in diameter.” One specific instance of such spreading occurred in Washington state during a choir rehearsal on March 6, according to Ristenpart. Here, where there were no known cases of coronavirus on the day of rehearsal, the significance of spreading occurring via asymptomatic individuals was clear due to the rate of infection after the rehearsal. “About three weeks ago outside of Seattle, after [Washington] started enforcing social distancing, a choir practice in a small indoors environment sang for two hours and 45 out of 60 people there got infected,” Ristenpart said. “This indicates that the most likely method of transmission was via aerosols. Since singing is typically at a pretty loud volume, [the choir] would have been emitting a lot of aerosol particles in the air. Other people breathe in those particles, then it goes deep into their lungs and they get infected.”
While the topic of viral transmission via aerosol particles may be novel to some, Asadi began her research on viral aerosol transmission long before the outbreak. “One thing that I noticed was that in literature, there were a lot of discrepancies between results,” Asadi said. “Some [papers concluded that] talking released more droplets than coughing and sneezing, and [other papers concluded that talking] was releasing less than those activities.” “They were not very specific about the experiments that they were doing,” Asadi said. “With talking, for example, it was not clear how loud the participants were during those activities. In most of the papers, the only talking activity that they tried was counting from 1 to 100.” In order to further investigate the role that asymptomatic individuals play in the spread of COVID-19, Ristenpart, Asadi and their colleagues elected to study the role of aerosol particles in infectious disease transmission in more detail. The results of the experiment were unexpected and partially unexplained, and may serve to provide more information about the nature of transmission and infectious potential of COVID-19 in the near future. “Surprisingly, we found that some individuals systematically release more droplets than others, and we called [these people] speech superemittors,” Asadi said.
SPEECHCOVID19 on 11
SCIENCE CLASSES MODIFY LABORATORIES FOR ONLINE LEARNING THIS SPRING Departments record experiments, conduct laboratories over Zoom
Students working in the lab during the Food Analysis Lab for Food Science in the Robert Mondavi Institute on Jan. 20. The students are analyzing several different teas for phenolic compounds using a spectrophotometric meseaure. (Photo by Gregory Urquiaga / Courtesy)
MAR G O ROSEN B AU M science@theaggie.org Pipettes, beakers, syringes and microscopes will not be used by students this quarter. With UC Davis’ decision to move to online learning in an effort to slow the spread of COVID-19, classes will not offer the same “traditional” laboratory experience this spring. Professors, teaching assistants (TAs) and other faculty worked hard to design creative online alternatives for laboratory classes. Most courses are hosting online alternatives to in-person labs at the scheduled class times. By using online video platforms like Zoom, students watch their TAs and professors conduct experiments, instead of doing it on their own. For the introductory chemistry classes offered this quarter, CHE 2B and CHE 2C, faculty in the department recorded themselves conducting some of the experiments before the campus closed, said Brian Enderle, a lecturer in the Chemistry Department. These experiments typically would have been done by students in labs. Faculty edited the videos for students to watch during Zoom video calls with their TAs.
Although students will not actually be completing the labs themselves, the TAs will talk them through the concepts and how to best analyze the data. In these videos, the Chemistry Department mimics the usual flow of the lab and focuses on teaching students concepts. The hope is for students to gain a similar understanding of laboratory concepts, but they will not get the same practice with scientific equipment, Enderle said. “This is the best of a difficult situation,” Enderle said. “We are doing our best but it will not be actually the same as using a pipette or [developing] glassware techniques that they would have in the lab. We can’t mimic and can’t send a bunch of glassware to your house.” Classes in other departments, such as biological sciences, have implemented similar setups. In BIS 2B, an introductory biology class about evolution and ecology, labs have moved to online platforms, said Ivana Li, a staff research associate and the BIS 2B lab manager, via email. “Like everyone else, all of our content is online,” Li said. “This means a lot of the experimental and interactive parts of the lab cannot be done. We’ve opted to create laboratory videos as the substitute for our in-person labs.”