Results 91 to 100 of about 4,316,557 (292)

The Radical-Pair Mechanism of Magnetoreception.

open access: yesAnnual Review of Biophysics, 2016
Although it has been known for almost half a century that migratory birds can detect the direction of the Earth's magnetic field, the primary sensory mechanism behind this remarkable feat is still unclear.
P. Hore, H. Mouritsen
semanticscholar   +1 more source

Uric acid provides an antioxidant defense in humans against oxidant- and radical-caused aging and cancer: a hypothesis.

open access: yesProceedings of the National Academy of Sciences of the United States of America, 1981
During primate evolution, a major factor in lengthening life-span and decreasing age-specific cancer rates may have been improved protective mechanisms against oxygen radicals.
B. Ames   +3 more
semanticscholar   +1 more source

Synthesis of 7-Acyl-2,4-disubstituted Pteridines by Radical Nucleophilic Substitution and Displacement Reactions

open access: yesPteridines, 2004
2,4-Disubstituted pteridine derivatives (1-3) react with acyl radicals very selectively in position 7 by a nucleophilic Substitution mechanism (4-10).
Döring Thomas   +2 more
doaj   +1 more source

Thinking sex: notes for a radical theory of the politics of sexuality

open access: yes, 2012
‘Asked his advice, Dr. J. Guerin affirmed that, after all other treatments had failed, he had succeeded in curing young girls affected by the vice of onanism by burning the clitoris with a hot iron . . .
Gayle S. Rubin
semanticscholar   +1 more source

Oxygen Activation and Radical Transformations in Heme Proteins and Metalloporphyrins

open access: yesChemical Reviews, 2017
As a result of the adaptation of life to an aerobic environment, nature has evolved a panoply of metalloproteins for oxidative metabolism and protection against reactive oxygen species. Despite the diverse structures and functions of these proteins, they
Xiong Huang, J. Groves
semanticscholar   +1 more source

Pesantren dan Islam Puritan: Pelembagaan Tajdid Keagamaan di Lembaga Pendidikan Islam

open access: yesTsaqafah, 2015
In the 18th century, the leaders of Muslim reformers focused their movement to break the internal rigidity in the form of tauh}îd purification against the dominance of schools and heretical eradication which commonly called the religious purification ...
M. Arfan Mu’ammar
doaj   +1 more source

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