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Cell Biology

Molecular Machine Parts Stockpiled in Readiness for Assembly
February 6, 2005
A team from the European Molecular Biology Laboratory has done a “4D” time-and-materials study of molecular machines, analyzing the process of assembly, reports EurekAlert.  They found that the cell stockpiles some parts and holds them in storage, but adds the crucial elements just in time. The researchers discovered that in yeast, key components needed to […]
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Cell Biology

Your Motors Are Turbo-Charged
January 30, 2005
Think how fast 6000 rpm is.  It would redline on most cars.  Yet you have motors in your body that make that speed look like slow-mo.     The Japanese have taken great interest in the cellular machine ATP synthase since its rotary operation was discovered in 1996 (see 12/22/2003 entry).  Maybe it’s because they […]
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Origin of Life

Astrobiology: Follow the Money
January 7, 2005
To date, astrobiology remains, as George Gaylord Simpson once quipped, “an area of study without a known subject.” Yet it is one of the hottest research areas within NASA. A renowned origin-of-life researcher from Scripps Institution of Oceanography, Dr. Jeffrey Bada, found out why when he read the new book The Living Universe: NASA and […]
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Cell Biology

Flagellar Oars Beat Like Galley Slaves In Synchronization
December 26, 2004
The Dec. 14 issue of Current Biology1 investigated another mystery in the operation of eukaryotic flagella: Flagella are microtubule-based structures that propel cells through the surrounding fluid.  The internal structure of a flagellum consists of nine parallel doublet microtubules arranged around a central pair of singlet microtubules (Figure 1).  Force for propulsion is provided by […]
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Origin of Life

Origin-of-Life Expert Jokes about Becoming a Creationist
November 5, 2004
Chemist admits problems in chemical evolution are so hard, he is tempted to become a creationist.
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Cell Biology

Bacterial Flagellum Reveals New Structural Complexity
October 27, 2004
The bacterial flagellum, the unofficial mascot of the Intelligent Design movement, got more praise from the evolutionary journal Nature this week: Samatey et al.1 analyzed the hook region in detail and found that it is composed of 120 copies of a specialized protein that “reveals the intricate molecular interactions and a plausible switching mechanism for […]
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Cell Biology

News Nuggets
October 12, 2004
Here’s a collection of news items that deserve quick notice: Mars Rumbles:  Mars still has minor earthquakes, says Space.com, That’s without plate tectonics, “But scientists don’t know exactly how Mars is constructed.”  The Mars Exploration Rovers, meanwhile, awaking from a winter’s nap, are still gathering science data long past their expected lifetime.  Evidence for past […]
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Cell Biology

Genome of Diatom Reveals Unanticipated Complexity
October 1, 2004
“Let’s play 20 questions.”: “OK, I’m game.  Animal, vegetable or mineral?” “Yes.” “I give up.” The answer is: a diatom.  Some of the most abundant one-celled organisms in the sea, and essential for regulating the global carbon cycle, diatoms seem to be part animal, vegetable and mineral.  Scientists aren’t sure how to classify them.  They […]
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Amazing Facts

Burnt Bridges, Brownian Ratchets, and Self-Propelled Motors Keep Skin Young Looking
October 1, 2004
Rock climbers and cavers are familiar with mechanical devices called ascenders that enable them to climb ropes safely and easily.  Ascenders slide up the rope in one direction, but latch onto it tightly when pulled the other direction.  Now imagine the ascender by itself, hanging on the rope, in a flurry of winds blowing in […]
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Cell Biology

Cell Exhibits Robust Engineering Design
September 22, 2004
Cells are so good at robustness against perturbations and uncertainty, engineers could well learn from their design principles.
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Amazing Facts

Secrets of the Spliceosome Revealed
September 17, 2004
A husband and wife team from Hebrew University has revealed the structure of the spliceosome, one of the most complex molecular machines in the cell (see 09/12/2002 headline), in more detail than ever before, says EurekAlert.  The spliceosome is responsible for cutting out the introns in messenger RNA after it has transcribed DNA, and also […]
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Amazing Facts

Peering Into Paley’s Black Box: The Gears of the Biological Clock
September 15, 2004
William Paley’s famous “watchmaker argument” for the existence of a Designer, though intuitively logical to many, has been criticized by naturalists on the grounds that one cannot compare mechanical devices to biological ones.  Biological “contrivances” might operate on totally different principles than mechanical ones made by humans we know.     Michael Behe’s 1996 book […]
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Cell Biology

Is the Evolution of Bacterial Resistance a Just-So Story?
September 12, 2004
Evolutionists frequently point to the emergence of bacterial resistance to antibiotics as an example of Darwinian evolution occurring right under our noses.  Bruce R. Levin of Emory University, writing in the Sept. 10 issue of Science,1 is not so sure about that.  He points out that cells might just have a built-in mechanism to shut […]
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Origin of Life

Pop Goes the Fatbubble Theory for the Origin of Life
September 3, 2004
This weird theory pops faster than the bubbles it describes as our ancestors.
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Amazing Facts

Researchers Record the Hum of Cellular Motors at Work
August 25, 2004
Researchers from UCLA placed a probe on a yeast cell and found that it vibrated at 1.6 kHz.  Further tests showed the vibration responded to temperature and to metabolic agents.  They think they have discovered the hum of cellular motors at work, reports Science News.1  “By the UCLA team’s calculations,“ writes Alexandra Goho, “molecular-motor proteins […]
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