{"id":105550,"date":"2017-02-03T08:00:33","date_gmt":"2017-02-03T13:00:33","guid":{"rendered":"https:\/\/www.bates.edu\/news\/?p=105550"},"modified":"2025-01-10T12:57:29","modified_gmt":"2025-01-10T17:57:29","slug":"seven-things-about-papaioanou-professor-ryan-bavis-and-his-research-on-how-babies-breathe","status":"publish","type":"post","link":"https:\/\/www.bates.edu\/news\/2017\/02\/03\/seven-things-about-papaioanou-professor-ryan-bavis-and-his-research-on-how-babies-breathe\/","title":{"rendered":"Seven things about Ryan Bavis\u2019 research on oxygen&#8217;s effects on how babies breathe"},"content":{"rendered":"<p>A member of the Bates faculty since 2003, Ryan Bavis became the second holder of the Helen A. Papaioanou Professorship in Biological Sciences this year, succeeding Pam Baker \u201969, who retired in 2013.<\/p>\n<p>On Jan. 20, the college celebrated Bavis\u2019 appointment with an afternoon lecture, followed by an evening reception and dinner. Among the guests were Ralph Perry \u201951 and his wife, Mary Louise Seldenfleur, whose gift established the professorship.<\/p>\n<p>A respiratory physiologist, Bavis researches how the brain controls breathing and, in particular, how the environment can alter how our breathing changes as we mature. His research has won two grants from the National Institutes of Health&#8217;s Heart, Lung, and Blood Institute as well as two <a href=\"https:\/\/inbre.maineidea.net\/\">Maine INBRE<\/a> awards.<\/p>\n<p>\u201cHis research has significant implications for our understanding of how humans \u2014 such as premature babies \u2014 develop in settings where their access to oxygen is too low or too high,\u201d said Dean of the Faculty Matt Auer in introducing Bavis\u2019 talk.<\/p>\n<p>Here are seven things we learned by spending some time listening to Bavis discuss his research.<\/p>\n<h5>1. His first research thrust didn\u2019t get off the ground.<\/h5>\n<p>As a doctoral student at the University of Montana, Bavis wrote his dissertation on the \u201cPhysiological Consequences of Exposure to Elevated Carbon Dioxide During Development in Birds.\u201d<\/p>\n<p>He was interested in burrowing birds, which are \u201cless sensitive to changes in oxygen and carbon dioxide in the air\u201d than other birds, as he explained during his talk. \u201cI was interested in how much is environmental and how much is genetic.\u201d<\/p>\n<p>\u201cSurprisingly,\u201d he said with characteristic dry wit, \u201cthere aren\u2019t many postdoc opportunities in labs where burrowing birds are the model.\u201d So he let his bird idea fly away (at least for now).<\/p>\n<h5>2. His successful current research is the result of a \u201chappy accident.\u201d<\/h5>\n<p>\u201cI did not expect to be doing this,\u201d said Bavis of his current research.<\/p>\n<p>For his postdoc, Bavis found a lab that was looking at the intersection of breathing control with \u201cplasticity,\u201d the ability of an organism to change in response to its environment.<\/p>\n<blockquote><p>\u201cAnd that decision has fueled my grants ever since.\u201d<\/p><\/blockquote>\n<p>The lab was in the Department of Comparative Biosciences at the University of Wisconsin School of Veterinary Medicine. \u201cThey\u2019d been using a rat model to examine hyperoxia,\u201d which is when an animal\u2019s tissues get too much oxygen. \u201cThey had looked at the long-term effects of hyperoxia but thought it was a dead end and didn\u2019t want to continue,\u201d Bavis said.<\/p>\n<p>Bavis saw value in using the same rat model but with a different question in mind.<\/p>\n<div id=\"attachment_105559\" style=\"width: 910px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0207.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-105559\" class=\"wp-image-105559 size-large\" src=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0207-900x600.jpg\" alt=\"web-170120_Bavis_Papaioanou_0207\" width=\"900\" height=\"600\" srcset=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0207-900x600.jpg 900w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0207-400x267.jpg 400w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0207-200x133.jpg 200w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0207.jpg 1620w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/a><p id=\"caption-attachment-105559\" class=\"wp-caption-text\">Ryan Bavis delivers a talk on &#8220;Learning to Breathe in a New World: The Complicated Role of Oxygen in Postnatal Development\u201d during the celebration of his appointment as the Helen A. Papaioanou Professor in Biological Sciences on Jan. 20, 2017, in Pettengill Hall. (Phyllis Graber Jensen\/Bates College)<\/p><\/div>\n<p>\u201cMy idea was to look at changes in the breathing of babies themselves, since some forms of plasticity would only be evident in that age group and not persist into adulthood,\u201d he said. \u201cThat decision has fueled my grants ever since,\u201d not to mention the early-career Giles F. Filley Memorial Award for Excellence in Respiratory Physiology and Medicine from the American Physiological Society, which Bavis received in 2006.<\/p>\n<p>When exposed to low oxygen (hypoxia) in the first few weeks of life, a baby will initially breathe harder \u2014 as we would \u2014 but will not sustain that high level of breathing as we would. The immature breathing is called the \u201cbiphasic hypoxic response.\u201d<\/p>\n<p>Bavis\u2019 lab looks at myriad questions about the biphasic hypoxic response, how it matures to an adult\u2019s sustained response, and how a high- or low-oxygen environment affects all that.<\/p>\n<h5>3. He involves lots of students in his research (and has won an award for that).<\/h5>\n<p>\u201cMy work has been supported by an army of students, and some are here today,\u201d said Bavis, sweeping an arm toward the audience.<\/p>\n<p>For the quality of how he\u2019s mentored that army, Bavis received a 2016 Mentor Award from the Council on Undergraduate Research&#8217;s Biology Division.<\/p>\n<p>CUR quoted his students, who praised Bavis for teaching them that \u201cscience is an ever-evolving collection of facts, ideas, and windows of opportunity\u201d and that \u201clife works out in its own way and if you put your mind to it, you can reach your own goals.\u201d<\/p>\n<p>Some Bavis numbers:<\/p>\n<ul>\n<li>59: number of thesis students he\u2019s advised since arriving in 2003.<\/li>\n<li>20: number of publications that include student co-authors<\/li>\n<li>27: number of presentations at scholarly meetings with student co-authors.<\/li>\n<\/ul>\n<p>The Papaioanou Professor Emerita Pam Baker has said that Bavis gives students a rock-solid foundation in the science that they do, and he teaches them how to communicate what they know<\/p>\n<div id=\"attachment_105558\" style=\"width: 910px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0173.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-105558\" class=\"wp-image-105558 size-large\" src=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0173-900x600.jpg\" alt=\"web-170120_Bavis_Papaioanou_0173\" width=\"900\" height=\"600\" srcset=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0173-900x600.jpg 900w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0173-400x267.jpg 400w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0173-200x133.jpg 200w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0173.jpg 1620w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/a><p id=\"caption-attachment-105558\" class=\"wp-caption-text\">Ryan Bavis&#8217; student researchers have praised him for teaching them that \u201cscience is an ever-evolving collection of facts, ideas, and windows of opportunity.\u201d (Phyllis Graber Jensen\/Bates College)<\/p><\/div>\n<p>&#8220;His students become articulate science communicators,&#8221; she said, &#8220;because Ryan himself is such an effective communicator. In this age, it is critically important that we can explain science to nonscientists.&#8221;<\/p>\n<h5>4. His students prove him wrong. And he\u2019s fine with that.<\/h5>\n<p>Bavis has found that lengthy exposure to low oxygen will slow down breathing\u2019s maturation, and high oxygen speeds it up. \u201cThat\u2019s a great story,\u201d he says. \u201cAnd if I had stopped there, life would have been a lot easier. But I didn\u2019t.\u201d<\/p>\n<p>He wanted to look at the mechanistic changes going on as a baby\u2019s breathing control was being hastened by hyperoxia to see if those changes were identical to the changes in normal maturation.<\/p>\n<p>At first, the mechanistic changes seemed identical. \u201cIt was looking good,\u201d Bavis said. \u201cBut then Andrew came along.\u201d<\/p>\n<p>That\u2019s Andrew Lachance \u201917 of Augusta, Maine, and his experiments have shown that the hyperoxia-induced maturation didn\u2019t really sustain itself \u2014 when the oxygen was reduced to normal, the baby rats\u2019 hypoxic responses became biphasic again.<\/p>\n<div id=\"attachment_105554\" style=\"width: 910px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0068.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-105554\" class=\"wp-image-105554 size-large\" src=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0068-900x600.jpg\" alt=\"web-170120_Bavis_Papaioanou_0068\" width=\"900\" height=\"600\" srcset=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0068-900x600.jpg 900w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0068-400x267.jpg 400w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0068-200x133.jpg 200w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0068.jpg 1620w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/a><p id=\"caption-attachment-105554\" class=\"wp-caption-text\">Ralph Perry \u201951 and his wife, Mary Louise Seldenfleur, whose gift established the endowed Papaioanou Professorship in 1999, listen to Ryan Bavis&#8217; talk. (Phyllis Graber Jensen\/Bates College)<\/p><\/div>\n<p>\u201cI\u2019m going to let Andrew figure out what this means,\u201d Bavis said as his audience laughed. \u201cWe have to do more experiments. But that can be for next year\u2019s thesis students.\u201d<\/p>\n<h5>5. Rats have proven their worth as a human model once again, Bavis says.<\/h5>\n<p>During the Q&amp;A, Bavis was asked, \u201cHow do you know that a rat\u2019s life stages are comparable to human life stages?\u201d<\/p>\n<p>\u201cThat\u2019s a fantastic question,\u201d he responded. \u201cI\u2019d love to show you a paper in my office called \u2018<a href=\"http:\/\/www.sciencedirect.com\/science\/article\/pii\/S0899900705001711\">How Old Is My Rat in People Years?<\/a>\u2019\u201d<\/p>\n<p>The answer, it turns out, depends on what trait you\u2019re looking at. For some aspects of the nervous system, a newborn rat is equivalent to a third-trimester human fetus. \u201cSo if we\u2019re thinking about studying premature animals, a rat is a very good model,\u201d he said.<\/p>\n<h5>6. He believes that there can be too much of a good thing.<\/h5>\n<p>In terms of how hypoxia and hyperoxia affect the physiology of a growing mammal, Bavis has been looking at the carotid body, a tiny structure located where our carotid artery forks in our neck.<\/p>\n<p>The carotid body, by acting as a sensor that responds to changes in oxygen in the blood, plays a role in regulating breathing. In a newborn rat, \u201chigh oxygen tends to slow the growth of the carotid body and reduces its size at adulthood,\u201d he said.<\/p>\n<div id=\"attachment_105562\" style=\"width: 910px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0412.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-105562\" class=\"wp-image-105562 size-large\" src=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0412-900x618.jpg\" alt=\"web-170120_Bavis_Papaioanou_0412\" width=\"900\" height=\"618\" srcset=\"https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0412-900x618.jpg 900w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0412-400x275.jpg 400w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0412-200x137.jpg 200w, https:\/\/www.bates.edu\/news\/files\/2017\/02\/web-170120_Bavis_Papaioanou_0412.jpg 1572w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/a><p id=\"caption-attachment-105562\" class=\"wp-caption-text\">Ryan Bavis talks with Associate Professor of Biology Lee Abrahamsen after his talk. (Phyllis Graber Jensen\/Bates College)<\/p><\/div>\n<p>In that sense, there can be too much of a good thing when it comes to oxygen.<\/p>\n<p>\u201cProlonged exposure to high oxygen in a developing infant can be bad,\u201d he said. \u201cIt seems to tip a balance from something that initially strengthens and speeds up the development of the nervous system\u201d \u2014 by helping to the maturation of breathing control \u2014 \u201ctoward something that is potentially harmful,\u201d in terms of a smaller carotid body later in life.<\/p>\n<p>Just what a smaller carotid body means in terms of health is not known, Bavis said.<\/p>\n<p>\u201cIn newborns, this could delay a baby\u2019s arousal if the sleeping baby is not getting enough oxygen,\u201d he said. \u201cIn adults, it could affect how we perform at high altitudes. But more research is needed.\u201d<\/p>\n<h5>7. More researchers and clinicians are paying attention to the effects of high oxygen in human babies because of Bavis&#8217; work.<\/h5>\n<p>For a long time, it\u2019s been known that giving baby extremely high oxygen can damage the developing eye. It\u2019s the believed cause of Stevie Wonder\u2019s blindness.<\/p>\n<p>\u201cBut moderately high oxygen levels that clinicians think are safe now may still be having an effect,\u201d Bavis said.<\/p>\n<p>Clinicians weren\u2019t thinking about the breathing of people exposed to moderately high or low levels of oxygen \u201cuntil they looked at my lab and the work of my postdoc mentor <a href=\"http:\/\/pt.phhp.ufl.edu\/about-us\/faculty\/gordon-s-mitchell\">Gordon Mitchell<\/a>,\u201d Bavis said. \u201cAnd now they\u2019ve started.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A respiratory physiologist, Bavis&#8217; research has significant implications for treatment of premature babies whose access to oxygen is too low or too high.<\/p>\n","protected":false},"author":104,"featured_media":105556,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_hide_ai_chatbot":false,"_ai_chatbot_style":"","associated_faculty":[],"_Page_Specific_Css":"","_bates_restrict_mod":false,"_table_of_contents_display":false,"_table_of_contents_location":"","_table_of_contents_disableSticky":false,"_is_featured":false,"footnotes":"","_bates_seo_meta_description":"","_bates_seo_block_robots":false,"_bates_seo_sharing_image_id":0,"_bates_seo_sharing_image_twitter_id":0,"_bates_seo_share_title":"","_bates_seo_canonical_overwrite":"","_bates_seo_twitter_template":""},"categories":[4,11011,162],"tags":[1690,10487,10803],"class_list":["post-105550","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-academic-life","category-awards","category-health-medicine","tag-biology","tag-matt-auer","tag-ryan-bavis"],"_links":{"self":[{"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/posts\/105550","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/users\/104"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/comments?post=105550"}],"version-history":[{"count":11,"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/posts\/105550\/revisions"}],"predecessor-version":[{"id":105623,"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/posts\/105550\/revisions\/105623"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/media\/105556"}],"wp:attachment":[{"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/media?parent=105550"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/categories?post=105550"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bates.edu\/news\/wp-json\/wp\/v2\/tags?post=105550"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}