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tag hescs microbiology cell molecular biology ecology culture

Microscopic image of a live amoeba.
Illuminating Specimens Through Live Cell Imaging
Charlene Lancaster, PhD | Mar 14, 2024 | 8 min read
Live cell imaging is a powerful microscopy technique employed by scientists to monitor molecular processes and cellular behavior in real time.
bacteria and DNA molecules on a purple background.
Engineering the Microbiome: CRISPR Leads the Way
Mariella Bodemeier Loayza Careaga, PhD | Mar 15, 2024 | 10+ min read
Scientists have genetically modified isolated microbes for decades. Now, using CRISPR, they intend to target entire microbiomes.
Of Cells and Limits
Anna Azvolinsky | Mar 1, 2015 | 9 min read
Leonard Hayflick has been unafraid to speak his mind, whether it is to upend a well-entrenched dogma or to challenge the federal government. At 86, he’s nowhere near retirement.
Opinion: Constrain Speculation to Protect the Integrity of Science
Mike Klymkowsky | Jun 18, 2018 | 4 min read
What we can know about biology before the last universal common ancestor is limited—and we should be circumspect in filling in the gaps.
Biological Terrorism
Jennifer Fisher Wilson | Nov 11, 2001 | 8 min read
One warning came in black-and-white in 1993: A U.S. Congressional Office of Technology Assessment report projected that releasing 100 kilograms of aerosolized anthrax spores upwind of the U.S. capital could kill between 130,000 and 3 million people-a lethality at least matching that of a hydrogen bomb. Last year, a U.S. Justice Department exercise revealed that discharging pneumonic plague in Denver could create 3,700 or more cases, with an estimated 950 or more deaths within a week.1 Then, acco
Monitoring Mutations with Microfluidics
Ruth Williams | Mar 15, 2018 | 3 min read
A device dubbed the “mother machine” enables real-time observation of mutagenesis in single bacterial cells.  
A scanning electron micrograph of a coculture of E. coli and Acinetobacter baylyi. Nanotubes can be seen extending from the E. coli.
What’s the Deal with Bacterial Nanotubes?
Sruthi S. Balakrishnan | Jun 1, 2021 | 10+ min read
Several labs have reported the formation of bacterial nanotubes under different, often contrasting conditions. What are these structures and why are they so hard to reproduce?
Human Pluripotent Cells Pass Safety Test
Douglas Steinberg | Sep 1, 2002 | 7 min read
Image: ©2001 MacMillan Publishers Ltd.  PLURIPOTENT-CELL PIPELINE: To obtain embryonic germ cells, researchers culture primordial germ cells (PGCs) dissected from the genital ridge. If left in situ, a PGC develops into spermatozoa or ova after its imprints have been erased and reestablished. Embryonic stem cells come from the blastocyst's inner cell mass. (Reprinted with permission, Nature 414:122-8, 2001) Because the science is hard and the politics mean, progress in understanding
Surpassing the Law of Averages
Jeffrey M. Perkel | Sep 1, 2009 | 7 min read
By Jeffrey M. Perkel Surpassing the Law of Averages How to expose the behaviors of genes, RNA, proteins, and metabolites in single cells. By necessity or convenience, almost everything we know about biochemistry and molecular biology derives from bulk behavior: From gene regulation to Michaelis-Menten kinetics, we understand biology in terms of what the “average” cell in a population does. But, as Jonathan Weissman of the University of Califo
translation gene genetics ribosome enhancers knowable magazine
What Does It Look Like to “Turn On” a Gene?
Alla Katsnelson, Casey Rentz, and Knowable Magazine | May 3, 2019 | 8 min read
Only recently have scientists directly witnessed this most pivotal of events in biology, thanks to new technology that allows them to observe the process in living cells. It’s teaching them a lot.

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