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Descoperiri si realizari stiintifice, Aici vorbim despre cercetarile stiintifice si aplicatiile lor
study_nature
post Mar 31 2011, 03:57 PM
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Voi ati invatat la biologie despre experimentul Miller-Urey din 1953 cu formarea de aminoacizi mixtura gazoasa supusa la descarcari electrice? Chiar daca este discutabila si ar putea fi supra- sau subestimata importanta acestor rezultate pentru a intelege cum si cat de usor a aparut initial viata, povestea ulterioara este foarte captivanta, de actualitate si cu rezultate stiintifice de abia publicate (in PNAS, full). Iata cum introduce Ed Yong tema:

QUOTE
In 1958, a young scientist called Stanley Miller electrified a mixture of simple gases, designed to mimic the atmosphere of our primordial lifeless planet. It was a sequel to one of the most evocative experiments in history, one that Miller himself had carried five years earlier. But for some reason, he never finished his follow-up. He dutifully collected his samples and stored them in vials but, whether for ill health or dissatisfaction, he never analysed them.

The vials languished in obscurity, sitting unopened in a cardboard box in Miller’s office. But possessed by the meticulousness of a scientist, he never threw them away. In 1999, the vials changed owners. Miller had suffered a stroke and bequeathed his old equipment, archives and notebooks to Jeffrey Bada, one of his former students. Bada only twigged to the historical treasures that he had inherited in 2007. “Inside, were all these tiny glass vials carefully labeled, with page numbers referring Stanley’s laboratory notes. I was dumbstruck. We were looking at history,” he said in a New York Times interview.

By then, Miller was completely incapacitated. He died of heart failure shortly after, but his legacy continues. Bada’s own student Eric Parker has finally analysed Miller’s samples using modern technology and published the results, completing an experiment that began 53 years earlier.


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"Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear."

-- Thomas Jefferson, letter to his nephew Peter Carr, from Paris, August 10, 1787; Merrill D. Peterson, ed., Thomas Jefferson: Writings, New York: Library of America, 1994, pp. 900-906.
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polihronu
post May 24 2011, 10:07 PM
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Nu mai stiu sa fi pomenit cineva de optogenetica si aplicatiile ei in neurostiinte. Gasiti si pe TED o prezentare la subiect. Poate nu e tocmai departe ziua in care vom putea stoca extern amintiri in format digital.


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"Omul care spune adevarul din cinism este un mincinos" - Bonhoeffer
"Onestitatea intelectuala este o conditie necesara a fericirii" - Paine
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study_nature
post May 24 2011, 10:17 PM
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Poli, ma bucur cand coincidem in subiectele pe care le consideram promitatoare. smile.gif


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"Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear."

-- Thomas Jefferson, letter to his nephew Peter Carr, from Paris, August 10, 1787; Merrill D. Peterson, ed., Thomas Jefferson: Writings, New York: Library of America, 1994, pp. 900-906.
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polihronu
post May 25 2011, 12:08 AM
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Multam de linkuri. Se fac, iata, progrese. Si am vazut si nume de romani printre autorii de articole pe tema asta.


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"Omul care spune adevarul din cinism este un mincinos" - Bonhoeffer
"Onestitatea intelectuala este o conditie necesara a fericirii" - Paine
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study_nature
post May 29 2011, 12:02 PM
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Si nu doar nume de romani ci si locatii din Romania apar in studii importante. Iata un exemplu, "Telomere length and early severe social deprivation: linking early adversity and cellular aging":

QUOTE
Accelerated telomere length attrition has been associated with psychological stress and early adversity in adults; however, no studies have examined whether telomere length in childhood is associated with early experiences. The Bucharest Early Intervention Project is a unique randomized controlled trial of foster care placement compared with continued care in institutions. As a result of the study design, participants were exposed to a quantified range of time in institutional care, and represented an ideal population in which to examine the association between a specific early adversity, institutional care and telomere length. We examined the association between average relative telomere length, telomere repeat copy number to single gene copy number (T/S) ratio and exposure to institutional care quantified as the percent of time at baseline (mean age 22 months) and at 54 months of age that each child lived in the institution. A significant negative correlation between T/S ratio and percentage of time was observed. Children with greater exposure to institutional care had significantly shorter relative telomere length in middle childhood. Gender modified this main effect. The percentage of time in institutional care at baseline significantly predicted telomere length in females, whereas the percentage of institutional care at 54 months was strongly predictive of telomere length in males. This is the first study to demonstrate an association between telomere length and institutionalization, the first study to find an association between adversity and telomere length in children, and contributes to the growing literature linking telomere length and early adversity.


Alte info despre studiu.


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"Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear."

-- Thomas Jefferson, letter to his nephew Peter Carr, from Paris, August 10, 1787; Merrill D. Peterson, ed., Thomas Jefferson: Writings, New York: Library of America, 1994, pp. 900-906.
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study_nature
post Jun 26 2011, 09:46 PM
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QUOTE (polihronu @ May 25 2011, 01:07 AM) *
Nu mai stiu sa fi pomenit cineva de optogenetica si aplicatiile ei in neurostiinte. Gasiti si pe TED o prezentare la subiect. Poate nu e tocmai departe ziua in care vom putea stoca extern amintiri in format digital.


Tot despre aplicatiile optometriei (numita de Nature Metoda Anului 2010), o descoperire publicata recent si o alta publicata pe la inceputul anului.


--------------------
"Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear."

-- Thomas Jefferson, letter to his nephew Peter Carr, from Paris, August 10, 1787; Merrill D. Peterson, ed., Thomas Jefferson: Writings, New York: Library of America, 1994, pp. 900-906.
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Fiul Risipitor
post Aug 9 2011, 11:22 AM
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Merita aruncat un ochi si aici:

Noua medicina germana


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"În fiecare sat există un om care pune fiecăruia în mână o făclie: acela este învățătorul. Și un altul care suflă în ea s-o stingă: acela este preotul" - Victor Hugo.
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polihronu
post Aug 10 2011, 05:11 PM
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Sau aici.


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"Omul care spune adevarul din cinism este un mincinos" - Bonhoeffer
"Onestitatea intelectuala este o conditie necesara a fericirii" - Paine
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Fiul Risipitor
post Aug 10 2011, 06:56 PM
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QUOTE (polihronu @ Aug 10 2011, 05:11 PM) *
Sau aici.



Ups. Recunosc, m-am rezumat la articol si n-am sapat mai departe sa vad despre ce-i vorba. Retractez link-ul smile.gif


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"În fiecare sat există un om care pune fiecăruia în mână o făclie: acela este învățătorul. Și un altul care suflă în ea s-o stingă: acela este preotul" - Victor Hugo.
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Ianis
post Sep 23 2011, 08:55 AM
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Teoria lui Einstein, pentru prima data in pericol: cercetatorii de la CERN au descoperit particule cu viteza mai mare decat cea a luminii


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I’m not afraid to die
I’m afraid to be alive without being aware of it
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icsicsics
post Jul 20 2012, 03:59 PM
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din republica autentica romania, un prieten de adevar care mai trece si pe la biserica asta, mi-a dat acum ceva timp pretext de o colecta:

Attached File  Cercetare.JPG ( 81.95K ) Number of downloads: 11


(iar faza e pe bune! am sters coordonatele destinatarului insa raman datele de contact ale expeditorului, pentru cei interesati.)


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"monstrul ratiunii naste somn".
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