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Petra Levin

@redrockcity.bsky.social
802 followers 668 following 68 posts

Microbiologist, mom, runner w/delusions of completing a marathon. Dog enthusiast. This Week in Microbiology (www.microbe.tv/twim).

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Petra Levin @redrockcity.bsky.social · 21/09/2026
Strong agree. Better ways to measure—and understand– bacterial growth “in the wild”—including in the human gut—are desperately needed.
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STCmicrobeblog @stcmicrobeblog.bsky.social · 20/09/2026
*all* microbiologists take note👇 𝗕𝗮𝗰𝘁𝗲𝗿𝗶𝗮𝗹 𝗴𝗿𝗼𝘄𝘁𝗵 𝗶𝘀 𝘀𝘁𝗿𝗮𝗶𝗴𝗵𝘁𝗳𝗼𝗿𝘄𝗮𝗿𝗱 𝘁𝗼 𝗺𝗲𝗮𝘀𝘂𝗿𝗲, 𝗰𝗼𝗺𝗽𝗹𝗲𝘅 𝗶𝗻 𝗼𝗿𝗶𝗴𝗶𝗻 𝗮𝗻𝗱 𝗲𝘅𝗾𝘂𝗶𝘀𝗶𝘁𝗲𝗹𝘆 𝘀𝗲𝗻𝘀𝗶𝘁𝗶𝘃𝗲 𝘁𝗼 𝗲𝗻𝘃𝗶𝗿𝗼𝗻𝗺𝗲𝗻𝘁𝗮𝗹 𝗮𝗻𝗱 𝗴𝗲𝗻𝗲𝘁𝗶𝗰 𝗽𝗲𝗿𝘁𝘂𝗿𝗯𝗮𝘁𝗶𝗼𝗻𝘀. a first sentence like the opening chords of beethoven's fifth... 😉
beethoven, 5th symphony opening

https://www.omifacsimiles.com/brochures/bee5.html
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Petra Levin @redrockcity.bsky.social · 19/09/2026
4 years (!) in the making, in this review Jade Wang and I detail the fundamental processes underlying growth, the cell autonomous nature of homeostatic control, and the contribution of stochasticity to both. TL;DR Bacteria are more like teenagers than you think. www.nature.com/articles/s41...
nature.com
Bacterial growth rate in populations and single cells - Nature Microbiology
In this Perspective, Levin and Wang give a brief history of bacterial growth rate and discuss how it is connected to nutrient availability and macromolecule synthesis, with a focus on (p)ppGpp as a ce...
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Prof Jenny Rohn @jennyrohn.bsky.social · 04/09/2026
Thrilled our latest paper out @natureportfolio.nature.com Nature Comms, lead author @microberamon.bsky.social, who developed P-FLO, a urine-flowing human micro-bladder model in collab with Oxford & Leicester to understand #UTI biology & treatment failure 1/4 #UTISky www.nature.com/articles/s41...
nature.com
Effect of human urinary microenvironment and fluid flow on antibiotic and phage therapy efficacy against uropathogenic Escherichia coli - Nature Communications
Maset et al. show that bladder conditions strongly influence how urinary tract infections respond to antibiotics and bacteriophages, highlighting the need for more realistic lab models to improve diag...
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Nature Microbiology @natmicrobiol.nature.com · 17/09/2026
Out Now! Bacterial growth rate in populations and single cells #MicroSky
go.nature.com
Bacterial growth rate in populations and single cells
Nature Microbiology, Published online: 17 September 2026; doi:10.1038/s41564-026-02449-6In this Perspective, Levin and Wang give a brief history of bacterial growth rate and discuss how it is connected to nutrient availability and macromolecule synthesis, with a focus on (p)ppGpp as a central hub regulating resource allocation and, indirectly, growth rate at the single-cell level.
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Prof Jenny Rohn @jennyrohn.bsky.social · 18/09/2026
“Bacterial growth is straightforward to measure, complex in origin and exquisitely sensitive to environmental and genetic perturbations.” Fantastic opening sentence to a deeply interesting topic. Never thought about bacterial growth like this before. #MicroSky #Bacteria
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Martin Thanbichler @thanbichlerlab.bsky.social · 10/11/2025
📢 Postdoc position: Biochemistry & Bacterial cell biology in our group at Marburg University, Germany, funded by the ERC Advanced Grant "C-SWITCH" 🔗More information at shorturl.at/OlvlL 📅Deadline: Nov 30, 2025 Please repost. #Postdoc
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Wiep Klaas Smits (ExpBac/CMAT) @smitslab.bsky.social · 06/11/2025
🚨 Publication alert! We are stoked to report the structural basis for activity of a novel class of antimicrobials targeting Gram positive priority pathogens in @natcomms.nature.com. There is something for everyone on this paper, and I will highlight a few things below 👇 1/9 doi.org/10.1038/s414...
doi.org
A unique inhibitor conformation selectively targets the DNA polymerase PolC of Gram-positive priority pathogens - Nature Communications
In this work, Urem et al. characterize the mode of action as well as mechanism of reduced susceptibility related to a class of antimicrobials that is in development for the treatment of infections wit...
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Petra Levin @redrockcity.bsky.social · 18/10/2025
Any conversation with @markowenmartin.bsky.social is a fun conversation. Really enjoyed sharing our science and my messy whiteboard! Come for a discussion of the environment and antibiotic resistance, stay for a (somewhat tortured) comparison of biology education to learning a foreign language. 💜
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Jan-Willem Veening @veeninglab.com · 04/10/2025
Finally out, such an awesome piece of work, very proud of this one: www.cell.com/cell-systems... #MicroSky
cell.com
Dual CRISPRi-seq for genome-wide genetic interaction studies identifies key genes involved in the pneumococcal cell cycle
Dénéréaz et al. introduce dual CRISPRi-seq, a broadly applicable method to chart gene-gene interactions across whole genomes. Applying it to the pathogen Streptococcus pneumoniae, they uncovered over ...
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Joe Peters Lab @joepeterslab.bsky.social · 03/10/2025
The Peters lab is looking for a new team member! The role transposons play in evolution, basic mechanisms regulating transposition, and applying transposons as tools for genome modification with a special focus on guide RNA-directed transposition. cornell.wd1.myworkdayjobs.com/CornellCaree...
cornell.wd1.myworkdayjobs.com
Technician III - Department of Microbiology
Position Summary This position will be in the lab of Dr. Joseph E. Peters in the Department of Microbiology. Research in the Peters’ lab broadly involves deciphering mechanisms in genome stability and...
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Ákos T Kovács @evolvedbiofilm.bsky.social · 03/10/2025
Amazing work by @hueihsuantsai.bsky.social and colleagues from @nikogeldner.bsky.social, Feng Zhou @tonnigrubeandersen.bsky.social labs in Science Localized glutamine leakage drives the spatial structure of root microbial colonization www.science.org/doi/10.1126/... #chemotaxis #MicroSky
science.org
Localized glutamine leakage drives the spatial structure of root microbial colonization
Plant roots release exudates to encourage microbiome assembly, which influences the function and stress resilience of plants. How specific exudates drive spatial colonization patterns remains largely ...
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Annika Barber @annikabarber.bsky.social · 01/10/2025
Despite These Times...my department is hiring! I really like my department, we have a good mix of disciplines and organisms and we're really low-drama. We also get pizza at faculty meeting. So if you're a computational and structural biologist, join us! 🧪 jobs.rutgers.edu/postings/260...
jobs.rutgers.edu
Assistant Professor - Tenure Track Faculty
The Department of Molecular Biology and Biochemistry at Rutgers, The State University of New Jersey, is inviting applicants for a tenure-track Assistant Professor position. The position requires a doc...
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Brian Stevenson Ph.D. spirochete lab @bstevensonlab.bsky.social · 01/10/2025
#MicroSky
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Tom Sandora, MD MPH @tomsandora.bsky.social · 30/09/2025
This is a truly remarkable finding: 17 years after introduction of the HPV vaccine, there was a decreased prevalence of HPV infection (and therefore decreased cancer risk) in both vaccinated AND unvaccinated individuals. Cancer prevention through herd immunity!!!
jamanetwork.com
Population-Level Effectiveness and Herd Protection 17 Years After HPV Vaccine
This cross-sectional study investigates population-level effectiveness and herd protection in the first 17 years after human papillomavirus (HPV) vaccination among adolescent girls and young women at ...
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Ashley Jester @ajester.bsky.social · 27/09/2025
Let me add one of my favorites: the simple test for toxoplasmosis that's saved so many babies I knew about the test b/c of my pregnancy & then I happened to rent the house across the street from the man who discovered it & created the modern treatment protocol med.stanford.edu/news/all-new...
med.stanford.edu
Jack Remington, infectious-disease expert and clinician, dies at 90
The Stanford physician devised a test that saved babies' lives by showing whether they needed immediate treatment for a parasitic disease called toxoplasmosis.
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Markus Deserno @markusdeserno.bsky.social · 26/09/2025
I am super excited to announce that we have a tenure-track faculty position in biophysics open in the Department of Physics at Carnegie Mellon! 🧪 Interfolio link: apply.interfolio.com/174360 PLEASE, share widely across the blue skies! Let me briefly explain what we're looking for: 1/10
Tenure-track Position in Biophysics at Carnegie Mellon University, Department of Physics

Location: Pittsburgh, PA
Open Date: Sep 19, 2025

Description
The Department of Physics at Carnegie Mellon University invites applications for a tenure-track faculty position in biophysics. The appointment is intended to be at the Assistant Professor level, but exceptional candidates at a higher level may also be considered. We seek outstanding candidates with a strong record in cellular and subcellular biophysics. Topics of particular interest include, but are not limited to, uncovering how key characteristics of living systems arise from the interplay between supramolecular cellular structures, how the emergent cellular circuitry defines goals and enables robust decision making, and how metabolic resources are allocated. This encompasses understanding of how information is learned, stored, transduced, and processed across subcellular structures. Applicants with theoretical, data science, or experimental backgrounds within biological physics are encouraged to apply. The ideal candidate will strengthen and extend research programs of current biophysics faculty in the Department of Physics and collaborate with broader life science activities across many departments at CMU and the wider Pittsburgh area.

More details on Interfolio: https://apply.interfolio.com/174360
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Zamin Iqbal @zaminiqbal.bsky.social · 25/09/2025
Delighted to see our paper studying the evolution of plasmids over the last 100 years, now out! Years of work by Adrian Cazares, also Nick Thomson @sangerinstitute.bsky.social - this version much improved over the preprint. Final version should be open access, apols. Thread 1/n
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George O'Toole (he/him/his) @geiselbiofilm.bsky.social · 26/09/2025
New in JB: Ma, Wang & Li review the role of DNA methylation in regulating pathogenesis, drug resistance, biofilm formation, adhesion, and motility and more! journals.asm.org/doi/10.1128/... @asm.org #JBacteriology
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The New York Times @nytimes.com · 23/09/2025
It is Fat Bear Week in Alaska. The popular competition lets anyone vote on which of the animals is most prepared for winter. nyti.ms/3IBbucx
 A very large brown bear walking in a field of grass.
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Martin Polz @polzlab.bsky.social · 11/08/2025
Longstanding collaboration with Scott Manalis where we have developed technology to measure single cell growth rates of bacteria in native seawater with some very surprising results. www.biorxiv.org/content/10.1...
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Wayne Riekhof @wayneriekhof.bsky.social · 12/09/2025
Very nice writeup on someone I've admired and learned from for many years. I didn't know he had passed until catching up on This Week in Microbiology driving to campus this morning. His 1958 paper on Salmonella growth rates basically founded the formal study of microbial physiology, which...
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John Helmann @johnhelmann.bsky.social · 12/09/2025
For those interested in further reading, the studies establishing the triplet nature of the genetic code were also reviewed by both Benzer and Crick in two 1962 Scientific American articles -- both worth a read! www.jstor.org/stable/24937... www.jstor.org/stable/24936...
jstor.org
The Fine Structure of the Gene on JSTOR
Seymour Benzer, The Fine Structure of the Gene, Scientific American, Vol. 206, No. 1 (January 1962), pp. 70-87
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ASM @asm.org · 12/09/2025
The 2025 agar art contest is open and accepting submissions until Oct. 26! The theme is “Microbes Make the World Go Round.” Submit your artwork and showcase the vital role microbes play in our daily lives. All are welcome to apply! See contest details: asm.org/events/asm-a...
Agar art: Microbes make the world go ground.
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Petra Levin @redrockcity.bsky.social · 12/09/2025
The last publication (he says!) from Rich Losick, my PhD advisor. Historical in nature it focuses on a seminal paper in molecular biology, the study revealing the genetic code to be triplet in nature. Come for the science, appreciate the clear prose! www.sciencedirect.com/science/arti...
sciencedirect.com
Revisiting a Breathtaking Publication in the History of Molecular Biology
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Kumaran Ramamurthi @ramamurthilab.bsky.social · 12/09/2025
Immunization with peptides can elicit antigen-specific T cell responses, but they're not widely used because they are poorly immunogenic and are rapidly cleared. Domenico D'Atri solves this by using our "SSHEL" platform (synthetic bacterial spores) . journals.asm.org/doi/10.1128/...
journals.asm.org
Immunization with peptide encapsulated within synthetic spores activates T cell responses and reduces tumor growth | mBio
Effective delivery of antigens to the immune system is essential for activating the adaptive immune system. Synthetic Spore Husk-Encased Lipids (SSHELs) are synthetic bacterial spore-like particles, w...
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Prahathees Eswara @eswaralab.bsky.social · 12/09/2025
We are hiring! Please share the news. Tenure Track Assistant Professor in Bacterial Pathogenesis See link below for details. We are a vibrantly growing department with friendly colleagues and supportive environment. Bonus: year-round sunshine in Tampa, FL 🌤🌴 Job Ad: tinyurl.com/USF-Microbio...
tinyurl.com
Assistant Professor - Molecular Biosciences
Department Name / Number: Molecular Biosciences / 0-1210-000 College: College of Arts and Sciences Hiring Salary: Negotiable Appointment Start Date: August 7, 2026 The Department of Molecular Bioscien...
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Petra Levin @redrockcity.bsky.social · 11/09/2025
So great to see Lucy Shapiro — a scientific hero of mine both for her pioneering work and for her incredible communication skills —honored today www.nytimes.com/2025/09/11/h...
nytimes.com
Major Medical Prizes Given to Cell Biology and Cystic Fibrosis Pioneers
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Séamus Holden 🔬🦠🧫 @seamusholden.bsky.social · 11/09/2025
Really enjoying reading this primer on single particle tracking #microscopy by @svanteeffelen.bsky.social and colleagues www.nature.com/articles/s43... (pdf on Sven's website)
nature.com
A guide to single-particle tracking - Nature Reviews Methods Primers
Single-particle tracking is a method for analysing different motion behaviours of individual proteins and protein complexes in live cells. This Primer outlines the experimental setup and labelling tec...
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Tom & Lorenzo @tomandlorenzo.bsky.social · 10/09/2025
This DIVA is SERVING
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Julie Le Bris @julielebris.bsky.social · 05/09/2025
Delighted to share our recently published work! Ever wondered how Klebsiella (and others) deals with capsule production’s costs ? The paper: journals.asm.org/doi/10.1128/... Thread👇
journals.asm.org
Phenotypic heterogeneity of capsule production across opportunistic pathogens | mBio
The polysaccharidic capsule is present in ~50% of species across the bacterial phylogeny, including all ESKAPE microorganisms, the six most significant multidrug-resistant (MDR) nosocomial pathogens. It is also an important virulence factor and a major ...
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David Tobin @tobinlab.bsky.social · 10/09/2025
Really interesting work from our neighbor Clare Smith @dukemedschool.bsky.social starting from CC mice and linking Ctsz to TB infection outcome as well as functional variation in human populations (UW, Case Western, Uganda) and expression in human granulomas (@charliejpyle.bsky.social)
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Wiep Klaas Smits (ExpBac/CMAT) @smitslab.bsky.social · 10/09/2025
Cross-regulation of (p)ppGpp and c-di-GMP pathways controls a cell-cycle transition www.biorxiv.org/content/10.1...
biorxiv.org
Cross-regulation of (p)ppGpp and c-di-GMP pathways controls a cell-cycle transition
Bacteria must adapt their physiology to changing environments, a process often orchestrated by nucleotide messengers such as (p)ppGpp and cyclic di-GMP (c-di-GMP). While (p)ppGpp promotes survival und...
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bioRxiv Microbiology @biorxiv-microbiol.bsky.social · 10/09/2025
Unraveling proteomic chaos by independent component analysis - ClpX proficiency promotes the iron and oxygen limitation responses of Staphylococcus aureus and affects the intracellular bacterial behavior www.biorxiv.org/content/10.1101/202…
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Cameron Thrash @jcamthrash.bsky.social · 08/09/2025
Dissecting microbial communities with single-cell transcriptome analysis www.science.org/doi/abs/10.1... #jcampubs
science.org
Dissecting microbial communities with single-cell transcriptome analysis
Revealing insights into the function of microbial communities requires moving beyond measuring bulk taxonomic composition to detecting interactions between subpopulations. Following the transformative...
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Casey terHorst @ecoevolab.bsky.social · 08/09/2025
The GRFP lives!! (due end of October) www.nsf.gov/funding/oppo...
nsf.gov
NSF Graduate Research Fellowship Program (GRFP)
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Quanta Magazine @quantamagazine.org · 01/06/2025
Manu Prakash practices “recreational biology,” a scientific approach that explores life in the same playful way that puzzles probe math. “Basic science is not at the service of something, but the groundwork that is our entire society’s foundation.” www.quantamagazine.org/how-paradoxi...
Manu Prakash, a bioengineer at Stanford University, interacts with students in a lab
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Prof Peter Hotez MD PhD DSc(hon) @peterhotezmdphd.bsky.social · 04/09/2025
Being asked about crazy inflated numbers by antivaccine groups regarding how vaccines kids get. ANS: we went from vaccinating vs 8 diseases when I was a resident in the 1980s, to 16 diseases today. But of those 16, 11 diseases are combined into just two shots. Breakdowns below:
Number of vaccines
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Conrad Hackett @conradhackett.bsky.social · 04/09/2025
Disease prevalence in US states before & after vaccine introduction 🧪 From Edward Tufte & graphics.wsj.com/infectious-d...
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Petra Levin @redrockcity.bsky.social · 04/09/2025
“Real science evolves with evidence.” www.wsj.com/opinion/robe...
wsj.com
Opinion | Robert F. Kennedy Jr., the CDC and Me
I was fired after 29 days because I held the line and insisted on rigorous scientific review.
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Jeremy Berg @jeremymberg.bsky.social · 04/09/2025
Harvard wins lawsuit regarding withheld grant funding [Gift Link] wapo.st/47tdz4A
wapo.st
Judge rules Trump administration cannot withhold funding from Harvard
The Trump administration illegally withheld federal funding for alleged antisemitism violations, a federal judge in Boston ruled.
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ASM @asm.org · 04/09/2025
As national medical, scientific, public health and patient organizations, we call for the resignation of HHS Secretary Robert F. Kennedy Jr. to ensure the health of the American people. Read our statement: asm.org/press-releas...
asm.org
Joint Statement Calling for Secretary Kennedy Resignation
The American Society for Microbiology released a joint statement calling for the resignation of HHS Secretary Robert F. Kennedy Jr.
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Michael Manhart @michaelmanhart.bsky.social · 02/09/2025
I am recruiting a Ph.D. student in microbial ecology, evolution, and systems biology for fall 2026. Please share! Details: qevomicrolab.org/Documents/Gr... Apply by October 1 here: forms.gle/38pPS1Ky84HB...
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Michael Baym @baym.lol · 01/09/2025
What was antibiotic resistance like before we ever used antibiotics? How did we change what antibiotic resistance genes looked like over 100 years? Our paper looking at resistance genes from a century of NCTC historical isolates now out in mGen: www.microbiologyresearch.org/content/jour...
microbiologyresearch.org
Genomic resistance in historical clinical isolates increased in frequency and mobility after the age of antibiotics
Antibiotic resistance is frequently observed shortly after the clinical introduction of an antibiotic. Whether and how frequently that resistance occurred before the introduction is harder to determin...
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Jeremy Berg @jeremymberg.bsky.social · 02/09/2025
A show of bipartisan support for NIH. Basically flat except for ARPA-H. The President’s budget proposal basically ignored (as it should have been).
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Vaughn Cooper @vscooper.micropopbio.org · 27/08/2025
The 2024 rankings of bacterial threats
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Petra Levin @redrockcity.bsky.social · 30/08/2025
Happy (and relieved?) to see the NYT do Margaret Rossiter justice with this fine obituary. If you have ever heard the term Matilda effect, thank Dr. Rossiter! www.nytimes.com/2025/08/29/s...
nytimes.com
Margaret W. Rossiter, 81, Dies; Wrote Women Scientists Into History
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James McInerney @jomcinerney.bsky.social · 29/08/2025
New preprint reveals bacteria can't just collect all resistance genes like Pokemon cards. We found mutually exclusive evolutionary pathways to multidrug resistance in E. coli & P. aeruginosa - some resistance mechanisms actively prevent others from coexisting www.biorxiv.org/content/10.1...
biorxiv.org
Genomic constraints shape the evolution of alternative routes to drug resistance in prokaryotes
Background Variation within the prokaryotic pangenome is not random, and natural selection that favours particular combinations of genes appears to dominate over random drift. What is less clear is wh...
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Petra Levin @redrockcity.bsky.social · 28/08/2025
Not only are students more stressed, but if getting an “A” is more important than learning something valuable, developing as a critical thinker and communicator, & becoming intellectually & personally resilient, then what exactly is the point of higher education? www.theatlantic.com/ideas/archiv...
theatlantic.com
The Perverse Consequences of the Easy A
In the era of grade inflation, students at top colleges are more stressed than ever.
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Britt Koskella @bkoskella.bsky.social · 28/08/2025
Really appreciated how @sethf.bsky.social described using AI in the evolution class that we co- teach: “ it’s like paying for a gym membership and then using a forklift to raise and lower your weights.”
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