Μια σταγόνα αίματος αποκαλύπτει όλες τις ιογενείς λοιμώξεις

Αποτελεί μεγάλη πρόοδο σε σχέση με τις υπάρχουσες διαγνωστικές τεχνικές

ΔΗΜΟΣΙΕΥΣΗ:  05/06/2015 11:38

Μια σταγόνα αίματος μπορεί να αποκαλύψει όλο το ιστορικό των ιογενών λοιμώξεων ενός ανθρώπου

 

Μια μόνο σταγόνα αίματος αρκεί για να αποκαλυφθούν όλες οι λοιμώξεις από ιούς που έχει τώρα ένας άνθρωπος, αλλά και όσες είχε περάσει στο παρελθόν. Είναι η πρώτη φορά που επιτυγχάνεται κάτι τέτοιο. Η μέθοδος με την ονομασία VirScan, την οποία ανέπτυξαν ερευνητές στις ΗΠΑ, αποτελεί μεγάλη πρόοδο σε σχέση με τις υπάρχουσες διαγνωστικές τεχνικές, που ελέγχουν για κάθε έναν ιό ξεχωριστά κάθε φορά.

Have we cured cancer?

By James Gallagher Health editor, BBC News website

 
• 1 June 2015
   

Have we cured cancer?

You will have been left with that impression if you walked past a newspaper stand this morning.
The short answer, if you're in a hurry, is no.
But something truly exciting is happening - the field of immunotherapy is coming of age.
It will not be a universal "cure" but immunotherapy is fast becoming a powerful new weapon alongside chemotherapy, radiotherapy and surgery.

Giant planet interiors studied with ab initio computer simulations - Bur...

              



Giant planet interiors studied with ab initio computer simulations - Bur...

Δημοσιεύτηκε στις 4 Ιουν 2015

Burkhard Militzer, UCB

Dr.
Militzer will briefly review the interior structure of different types
of planets and discuss how it is affected by the miscibility of various
planetary materials. Results from recent ab initiocomputer simulations
will be presented that focus on the miscibility properties of four
systems: hydrogen-helium mixtures in gas giant planets, hydrogen-water
mixtures in ice giants, silicate-iron mixtures in the interiors of
terrestrial planets.

Finally Dr. Militzer will discuss his recent
model of Jupiter’s interior that he and his team are putting together
before NASA’s Juno spacecraft inserts into orbit about this planet next
year.

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ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 7/6/2015

Geology before Pluto: Pre-encounter considerations - Jeff Moore (SETI Ta...

    

Geology before Pluto: Pre-encounter considerations - Jeff Moore (SETI Ta...

Δημοσιεύτηκε στις 29 Μαΐ 2015

The
cameras of New Horizons will provide robust data sets that should be
imminently amenable to geological analysis of the Pluto system’s
landscapes. I will give with a brief discussion of the planned
observations by the New Horizons cameras that will bear most directly on
geological interpretability.

Then I will review the major
geological processes that could potentially operate on the surfaces of
Pluto and its major moon Charon. I will briefly survey exogenic
processes (i.e. those for which energy for surface modification is
supplied externally to the planetary surface): impact cratering,
sedimentary processes (including volatile migration), and the work of
wind. I will conclude with an assessment of the prospects for endogenic
activity in the form of tectonics and cryovolcanism.

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ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 7/6/2015

Lakes, Fans, Deltas and Streams: Geomorphic Constraints ...

     



Lakes, Fans, Deltas and Streams: Geomorphic Constraints ...

Δημοσιεύτηκε στις 26 Μαΐ 2015

Full title: Lakes, Fans, Deltas and Streams: Geomorphic Constraints on the Hydrologic History of Gale Crater, Mars

Marisa Palucis, UCB

It
has been proposed that in Gale Crater, where the Curiosity rover landed
in August 2012, lakes developed to various depths after the large
central mound (informally referred to as Mt. Sharp) had evolved to a
form close to its current topography. Using a combination of CTX and
HiRISE imagery and CTX, HiRISE and HRSC topography, we have documented a
sequence of rising and falling lake levels, thereby providing a
possible relative timeline of the hydrologic events within Gale crater.
Assuming that the entrance canyon deposits (the canyon which the
Curiosity rover will ascend once it reaches Mt. Sharp) records a
back-stepping sequence of fans and deltas, then a corresponding
hydrologic sequence is suggested. After the formation of a gilbert-type
delta exiting an 84-km long incised valley (Farah Vallis) that drains
270,000 km2 to the south of Gale, and a corresponding lake with an
average depth of 700 meters, the inflow of water from Farah Vallis fell
or ceased. The lake level dropped considerably, to an elevation at least
below the entrance canyon deposits. At a later time, local
precipitation drove gully erosion of the Gale rim, and amplified by
renewed Farah Vallis runoff, caused a rising lake level that produced
deltas on the western rim of Gale and the entrance canyon deposits on
Mt. Sharp. This hydrologic system shut down sufficiently abruptly that
the deltas did not cut down as the lake evaporated. The time gap between
these two lake forming events, perhaps driven by different hydrologic
systems, is not yet established. Fan deposition around Gale crater,
including the Peace Vallis fan near the rover’s landing site, likely
occurred after these large lakes disappeared. This has implications for
understanding regional paleo-climates on Mars after the Noachian, as
well as providing context for the geology and sedimentology along the
Curiosity rover traverse.

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ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 5/6/2015

Paleoenvironmnetal Reconstruction and the Identification of Habitable Co...

   



Paleoenvironmnetal Reconstruction and the Identification of Habitable Co...

Δημοσιεύτηκε στις 19 Μαΐ 2015

Full
Title: Paleoenvironmnetal Reconstruction and the Identification of
Habitable Conditions on Ancient Earth and Mars Using Clay Minerals (SETI
Talks)
Tom Bristow, SETI Institute

Clay minerals often form
at or near rocky planetary surfaces under low temperature hydrous
conditions. Careful identification of the types of clay minerals and
consideration of their geological context can yield information on
ancient environmental conditions, including inferences of atmospheric
composition. However, this task is complicated by multiple potential
sources of clays and overprinting by subsequent diagenetic or
hydrothermal processes. Dr Bristow will discuss approaches to
paleoenvironmental interpretation of clay mineral-bearing sedimentary
rocks with a focus on recent findings from the Mars Science Laboratory
(MSL) rover Curiosity. MSL’s discovery of clay minerals in ancient lake
sediments at Yellowknife Bay is critical evidence of habitable
conditions in the past. Determination of the origins of the clay
minerals at Yellowknife Bay provides constraints on the longevity of
aqueous conditions, redox state within sediments, and potential chemical
energy sources for organisms.

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  • Τυπική άδεια YouTube
  ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 5/6/2015
  
  
  

Brown Dwarf Variability and implications for Exoplanets - Tyler Robinson...

     

Brown Dwarf Variability and implications for Exoplanets - Tyler Robinson...

Δημοσιεύτηκε στις 12 Μαΐ 2015

Brown
dwarfs are sub-stellar objects that occupy the region of parameter
space between gas giant planets, like Jupiter, and the smallest bona
fide stars. Since brown dwarfs never achieve sustained core hydrogen
fusion, they are destined to cool over cosmic timescales from thousands
to hundreds of degrees Kelvin. Observations and models of these strange
worlds reveal hydrogen-dominated atmospheres with a variety of trace
molecular species, as well as metal, dust, and salt condensates.

Recent
surveys and targeted observations have revealed that a substantial
fraction of brown dwarfs have a brightness that varies in time, with
some variations as large as 30% at certain wavelengths. In this
presentation, Dr. Robinson will review the atmospheric physics of brown
dwarfs and the current state of variability observations, and he will
discuss the various processes that likely cause brown dwarf variability,
which include dynamical effects, temporally- and spatially-varying
clouds, and associated atmospheric temperature fluctuations.

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  Άδεια
  

  • Τυπική άδεια YouTube
  ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 5/6/2015