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Cell Biology

Cell Has Automatic Jam-Clearing Proofreading Machinery
September 19, 2005
Findings at Rockefeller University have scientists excited.  DNA copying machines work on a “sliding clamp” that can hold two repair machines at the same time.  One is a low-fidelity repair tool, the other a high-fidelity repair tool.  Usually, the high-fidelity one is active, but when it needs a bigger hammer that is perhaps more effective […]
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Cell Biology

Bacterial Parcel Service Discovered
September 14, 2005
Bacteria send letters and parcels to one another.  Some of them are love letters, some of them are letter bombs.  This amazing packaged system of communication, separate from the mere sending of diffusible chemicals, was described in Nature1 with the title, “Microbiology: Bacterial speech bubbles.”  Stephen C. Winans described what is known about bacterial communication: […]
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Cell Biology

Molecular Motors Galore: How Did They Evolve?
August 26, 2005
Myosin is one of the cell’s little monorail motors that trucks cargo around the cell, pushes false feet into the surrounding environment, forces packages out the cell membrane, makes muscles move and wiggles hairlike cilia.  Scientists reporting in Nature1 found twice as many varieties of myosin (37) than were previously known (17) and decided to […]
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Cell Biology

Saddle Up Your Algae: Scientists Harness Flagellar Motors
August 19, 2005
1805: Beast of burden of choice: oxen. 2005: Beast of burden of choice: algae. Science Now reported an unusual item: scientists have learned how to hitch their loads to a single-celled green alga named Chlamydomonas reinhardtii (see Yale description).  Researchers are actually calling their little teams “micro-oxen.” Scientists are increasingly interested in harnessing biological motors […]
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Cell Biology

Body Scan: How Precision Engineering Aids Human Acumen
August 5, 2005
Often the most interesting science stories are the ones about us– how our bodies and minds function.  Actions we perform each day without much thought are made possible by precision engineering, sometimes at the molecular level.  Here is a selection of news briefs about human superpowers. Electrical engineering: We have untold myriads of electrical voltage […]
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Cell Biology

Cell’s High-Fidelity Proofreading and Editing Explained
July 26, 2005
—It’s unusual to have a story win both Amazing and Dumb awards simultaneously, but the reason will become clear.–ed.) Luisa Cochella and Rachel Green (Johns Hopkins) have published a primer on “Fidelity in Protein Synthesis” in Current Biology.1  This is a good article for cell biology enthusiasts to read, to learn more about the methods […]
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Cell Biology

“Junk” Cells Maintain the Brain
July 16, 2005
The most abundant immune cells in your brain are not the neurons, but microglia – spindly cells that were thought to be static and immobile, the smallest of the glia cells that were once considered mere scaffolding to support the more important gray matter (see 11/20/2001 and 01/29/2001 entries).  When two scientists recently applied the […]
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Cell Biology

Small Wonder: Tubulin Visualized Up Close
June 28, 2005
Science Daily printed a neat story about microtubules, complete with a 3D visualization of how the protein components are arranged.  They are not just ropes or chains, but complex cylinders of precise parts.  Scientists are starting to get an idea of why they continually grow and shrink within the cell.  The process allows them to […]
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Cell Biology

Reverse-Engineering Biological Networks Challenges Caltech Scientists
June 25, 2005
Evolutionists love to quote Dobzhansky saying, “Nothing in biology makes sense apart from evolution.”  An article in the current issue of Caltech’s magazine Engineering and Science,1 however, might change that proverb to, “Nothing in biology makes sense apart from information theory and systems engineering.”  The article makes no mention of evolution, but rather looks at […]
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Cell Biology

Cell Wonders Accelerate
June 14, 2005
Scientific papers on cell biology continue to uncover amazing things as techniques improve to peer into the workings of these units of life.  Here are our Top Ten from the last few weeks: Immunity Tunes:  A press release from Johns Hopkins talked about how, unlike other cells, immune cells undergo a “dizzying loop of activity” […]
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Cell Biology

Enzymes Chew Like Pac-Man
June 10, 2005
Evidence is growing that many enzymes have moving parts.  They act like scissors, clamps and little pac-mans.  When precisely-folded chains of amino acids emerge from the ribosome, they fold into unique shapes with the aid of chaperones.  But those shapes are not static globs.  They move, say Dmitry A. Kondrashov and George N. Phillips, Jr. […]
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Cell Biology

Stem Cell Headlines
May 23, 2005
Research on embryonic stem cells is proceeding apace without an ethical anchor, and no clue where it will lead.  News coverage of the debate accelerated with an announcement from South Korea. Match point:  The BBC News and many other news sources published South Korea’s announcement that stem cells matched to the individual have been tailored […]
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Cell Biology

Design Language Gushes Out of Article Describing Cell Quality Control
May 18, 2005
Here are the design words found in a press release from Michigan State describing the editing mechanisms of the cell DNA-to-RNA transcription process: high fidelity, quality control, inner workings, genetic coding, exquisite nanotechnology in living systems, genetic control, blueprint for life, industrial assembly line, conveyor belt, preloading, criteria, backs up to correct the error, sensed […]
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Cell Biology

Rotary Clock Discovered in Bacteria
May 17, 2005
What could be more mechanical than a mechanical clock?  A biochemist has discovered one in the simplest of organisms, one-celled cyanobacteria.  Examining the three complex protein components of its circadian clock, he thinks he has hit on a model that explains its structure and function: it rotates to keep time.  Though it keeps good time, […]
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Cell Biology

Can Gene Duplication Promote Evolution?
May 15, 2005
Imagine you had no mouth but needed to eat.  A hamburger comes flying at you.  When it hits your body, your skin folds around it and pinches off, sealing it inside.  Dozens of 3-armed parts form a geodesic dome around it and carry it to the stomach.  Once delivered, all the parts are recycled for […]
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