[Biologia] Fwd: The Final Component of Anthrax's Toxic Triad

Tue, 29 Jan 2002 13:27:41 +0000

Hola:

Si no tienen este servicio y les interesa, lean la parte final

Saludos

Maru Heres

>From: "ScientificAmerican.com" <newsletters@sciam.rsc03.com>
>Reply-To: "ScientificAmerican.com" <newsletters@sciam.com>
>To: meheres@hotmail.com
>Subject: The Final Component of Anthrax's Toxic Triad
>Date: Tue, 29 Jan 2002 00:47:14 -0800
>
>________________________________________________________________
>ScientificAmerican.com -- WEEKLY REVIEW       January 29, 2002
>________________________________________________________________
>
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>================================================================
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>
>IN THIS ISSUE
>-------------------------
>** THE FINAL COMPONENT OF ANTHRAX'S TOXIC TRIAD
>** HIGH-TEMPERATURE SUPERCONDUCTORS BEHAVING STRANGELY
>** TESTOSTERONE PREVENTS KEY ALZHEIMER'S ABNORMALITY
>** CARBON NANOTUBES COULD SERVE AS ULTRAFAST OSCILLATORS
>** SPYING SEALS TRACK ELUSIVE ANTARCTIC FISH
>
>Also...ASK THE EXPERTS
>** WHAT IS ANTIMATTER?
>-------------------------
>
>
>-------------------------- WEEKLY REVIEW ---------------------------
>** THE FINAL COMPONENT OF ANTHRAX'S TOXIC TRIAD
>After the bioterrorism of last fall, researchers are more anxious than
>ever to find drugs to combat anthrax. Now scientists have determined
>the structure of the last of three poisonous proteins that make up the
>bacteria's deadly toxin. This third component, dubbed edema factor
>(EF), may very well represent the anthrax toxin's Achilles' heel.
>http://sciam.rsc03.net/servlet/cc?lJpDUWEtLoLkLlFohmtHpsDJhtE0EWCA
>
>
>** HIGH-TEMPERATURE SUPERCONDUCTORS BEHAVING STRANGELY
>For now, the closest thing to a room temperature superconductor is a
>high-critical temperature (Tc) one. Unlike superconducting metal
>alloys, which must remain near absolute zero to display a resistance-
>free electron flow, high-Tc superconductors operate at around 77
>degrees Kelvin. A new report shows that the electrons in high-Tc
>superconductors also behave differently from those in the
>conventional variety.
>http://sciam.rsc03.net/servlet/cc?lJpDUWEtLoLkLlFohmtHpsDJhtE0EWCB
>
>
>** TESTOSTERONE PREVENTS KEY ALZHEIMER'S ABNORMALITY
>New research suggests that testosterone treatment could prevent or
>delay the onset of Alzheimer's disease in aging men and women.
>According to findings detailed in a report released by the Proceedings
>of the National Academy of Sciences, doses of the hormone, given alone
>or in combination with estrogen, staved off a key chemical aberration
>characteristic of the disease in rats.
>http://sciam.rsc03.net/servlet/cc?lJpDUWEtLoLkLlFohmtHpsDJhtE0EWCC
>
>
>========================== BOOKSTORE ===========================
>THE SECRET LIFE OF DUST: FROM THE COSMOS TO THE KITCHEN COUNTER,
>THE BIG CONSEQUENCES OF LITTLE THINGS by Hannah Holmes
>
>Dust, science writer Holmes tells the reader, is so ubiquitous that
>"by the time you have read this far [11 lines into her first chapter],
>you may have inhaled 150,000 of these worldly specks." Billions of
>tons of dust rise from Earth every year, from deserts, volcanoes,
>oceans, living things and factories. Billions of tons fall to Earth
>every year, not only from what rose but also from space. This
>enormous traffic of tiny things has profound effects, good and bad,
>on Earth and on living organisms. Holmes makes an engaging story of
>the worldly specks.
>http://sciam.rsc03.net/servlet/cc?lJpDUWEtLoLkLlFohmtHpsDJhtE0EXTT
>===============================================================
>
>
>** CARBON NANOTUBES COULD SERVE AS ULTRAFAST OSCILLATORS
>The minuscule size of most nanotubes--hollow cylinders of carbon
>measuring only a few billionths of a meter wide--boggles the mind.
>Even more astounding may be that scientists can conceivably nestle
>these straws inside one another like Matryoshka dolls, with the inner
>set of tubes sliding in and out a billion times a second. Such
>gigahertz oscillators could aid in the creation of
>nanomechanical devices.
>http://sciam.rsc03.net/servlet/cc?lJpDUWEtLoLkLlFohmtHpsDJhtE0EXTU
>
>
>** SPYING SEALS TRACK ELUSIVE ANTARCTIC FISH
>To study the behavior of two elusive species of fish, scientists have
>enlisted the help of some unlikely photographers: seals. Antarctic
>silverfish and Antarctic toothfish, though abundant in the Southern
>Ocean, spend much of their time at great depths and under thick ice,
>making observation difficult. But as the fishes' natural predator,
>the Weddell seal knows exactly where to find them.
>http://sciam.rsc03.net/servlet/cc?lJpDUWEtLoLkLlFohmtHpsDJhtE0EXTV
>
>
>ASK THE EXPERTS
>====================================================
>** WHAT IS ANTIMATTER?
>R. Michael Barnett of the Lawrence Berkeley National Laboratory and
>Helen Quinn of the Stanford Linear Accelerator Center offer an answer.
>http://sciam.rsc03.net/servlet/cc?lJpDUWEtLoLkLlFohmtHpsDJhtE0EXTW
>====================================================
>
>
>AND REMEMBER...
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Prof.M.Eugenia Heres Pulido
Carrera de Biología
FES Iztacala, UNAM
Av. Los Barrios s/n Los Reyes Iztacala
Tlalnepantla, Edo. de México
Tél:5623-1197, 5623-1149

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