News tagged with complex
Compressing photonic signals for greater bandwidth
Nov 03, 2009 |
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Cornell researchers have developed an ingenious method to time-compress optical signals. The process could enable optical communication systems to carry many more bits per second or could also be used to generate ...
Biologists reveal structure of cell nucleus 'gatekeeper'
Oct 27, 2009 |
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(PhysOrg.com) -- Biologists led by associate professor Thomas Schwartz (MIT) have worked out a rudimentary architectural plan for the nuclear pore complex (NPC), the gatekeeper of the cell's nucleus.
Scientists bend nanowires into 2-D and 3-D structures
Oct 21, 2009 |
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(PhysOrg.com) -- Taking nanomaterials to a new level of structural complexity, scientists have determined how to introduce kinks into arrow-straight nanowires, transforming them into zigzagging two- and three-dimensional ...
High-speed genetic analysis looks deep inside primate immune system
Oct 12, 2009 |
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(PhysOrg.com) -- Viruses such as HIV and influenza take safe harbor in cells, where they cannot be recognized directly by the immune system. The immune response relies on infected cells announcing the presence of the virus ...
Come on in: Nuclear barrier less restrictive than expected in new cells
Oct 06, 2009 |
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When it comes to the two basic types of cells, prokaryotes and eukaryotes, compartmentalization is everything. Prokaryotes are evolutionarily ancient cells that only have a membrane surrounding their outer boundary, while ...
'Promiscuous' protein interactions found in the nuclear pore complex
Sep 29, 2009 |
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(PhysOrg.com) -- The NPC is the only way in or out of a cell's nucleus. It plays a key role in cellular metabolism and signaling, and any malfunction in these pores can have lethal consequences. Now new research reveals further ...
Researchers unravel brain's wiring to understand memory
Medicine & Health / Neuroscience
Sep 28, 2009 |
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Using a powerful microscope, Karel Svoboda, a brain scientist at the Janelia Farm Research Campus in Ashburn, Va., peers through a plastic window in the top of a mouse's head to watch its brain's neurons sprout new connections ...
How Did Evolution Begin?
Sep 28, 2009 |
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(PhysOrg.com) -- Life's ability to replicate itself is essential for evolution, yet even the simplest kind of replication requires a relatively complex system. So what kind of non-replicating system might ...
International scientists set boundaries for survival
Sep 23, 2009 |
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Human activities have already pushed the Earth system beyond three of the planet's biophysical thresholds, with consequences that are detrimental or even catastrophic for large parts of the world; six others ...
Echoes of phlogiston in stem cell biology
Sep 21, 2009 |
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Before it was learned that matter burns by taking up oxygen, most chemists sought to explain combustion as the release of a mysterious substance, which they named "phlogiston". Phlogiston theory was a conceptual breakthrough ...
Polymorphisms of the interleukin-1 gene complex may influence alcohol dependence
Sep 18, 2009 |
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Cytokines are small proteins secreted by cells that serve as molecular messengers between cells. Pro-inflammatory cytokines - which function in the immune system - may be involved in alcohol dependence (AD). A study of ...
Truth Is Stranger Than Science: Discovering true properties of metal oxides
Sep 17, 2009 |
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(PhysOrg.com) -- To successfully compete in a global marketplace, manufacturers continually search for better materials: faster drying and less hazardous paint, longer-lasting sunscreen, and faster computers. ...
Landmark study sheds new light on human chromosomal birth defects
Sep 16, 2009 |
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Using yeast genetics and a novel scheme to selectively remove a single protein from the cell division process called meiosis, a cell biologist at The Florida State University found that when a key molecular ...
Web page ranking algorithm detects critical species in ecosystems
Sep 04, 2009 |
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Google's algorithm for ranking web-pages can be used to determine which species are critical for sustaining ecosystems. Drs. Stefano Allesina and Mercedes Pascual find that "PageRank" can be applied to the study of food webs, ...
Solving the Nuclear Pore Puzzle
Aug 19, 2009 |
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(PhysOrg.com) -- Computational biochemist Frank Alber compares determining the architecture of a macromolecular machine to solving a jigsaw puzzle.
