27,942 research outputs found
Comedia famosa A lo que obligan los zelos
Fernando Zerate es pseudoĢnimo de Antonio EnriĢquez GoĢmez, seguĢn cataĢlogo de la Biblioteca NacionalPrecede al tiĢt.: " Num. 165"Francisco SuriaĢ y Burgada ejerce como impresor entre 1770 y 1805Los datos de publicacioĢn constan en el colofoĢnSign.: A-Dā“Texto a dos col.H HAZ/3822(9
Sexual Dimorphism in Human Teeth from Dental Morphology and Dimensions: A Dental Anthropology Viewpoint
Descolonizando la escuela: narrativas de escuelas insurrectas y subalternas como otras praĢcticas de socializacioĢn
Este texto nace de relatos compilados en procesos de investigacioĢn y accioĢn colectiva en medio del destierro y las resistencias. Las narrativas que comparto surgieron de colectivos y comunidades en movimientos culturales e intergeneracionales que han transgredido el lugar hegemoĢnico de la escuela colonial a partir de praĢcticas de autonomiĢa, autodeterminacioĢn y reafirmacioĢn del pensamiento propio, las cuales posibilitan sostener que la escuela no estaĢ naturalmente ocupada por las fuerzas hegemoĢnicas. MaĢs que encargarse de la reproduccioĢn de las ideologiĢas dominantes se constituye en escenario de socializacioĢn de poderes alternativos frente al despojo a partir de la vinculacioĢn de los territorios culturales ancestrales y urbano-populares como referentes de descolonizacioĢn del pensamiento, el sentimiento y la accioĢn educativa
Structure of a Complete ATP Synthase Dimer Reveals the Molecular Basis of Inner Mitochondrial Membrane Morphology
We determined the structure of a complete, dimeric F1Fo-ATP synthase from yeast Yarrowia lipolytica mitochondria by a combination of cryo-EM and X-ray crystallography. The final structure resolves 58 of the 60 dimer subunits. Horizontal helices of subunit a in Fo wrap around the c-ring rotor, and a total of six vertical helices assigned to subunits a, b, f, i, and 8 span the membrane. Subunit 8 (A6L in human) is an evolutionary derivative of the bacterial b subunit. On the lumenal membrane surface, subunit f establishes direct contact between the two monomers. Comparison with a cryo-EM map of the F1Fo monomer identifies subunits e and g at the lateral dimer interface. They do not form dimer contacts but enable dimer formation by inducing a strong membrane curvature of ā¼100Ā°. Our structure explains the structural basis of cristae formation in mitochondria, a landmark signature of eukaryotic cell morphology
Origin and genetic diversity of diploid parthenogenetic Artemia in Eurasia
There is wide interest in understanding how genetic diversity is generated and maintained in parthenogenetic lineages, as it will help clarify the debate of the evolution and maintenance of sexual reproduction. There are three mechanisms that can be responsible for the generation of genetic diversity of parthenogenetic lineages: contagious parthenogenesis, repeated hybridization and microorganism infections (e.g. Wolbachia). Brine shrimps of the genus Artemia (Crustacea, Branchiopoda, Anostraca) are a good model system to investigate evolutionary transitions between reproductive systems as they include sexual species and lineages of obligate parthenogenetic populations of different ploidy level, which often co-occur. Diploid parthenogenetic lineages produce occasional fully functional rare males, interspecific hybridization is known to occur, but the mechanisms of origin of asexual lineages are not completely understood. Here we sequenced and analysed fragments of one mitochondrial and two nuclear genes from an extensive set of populations of diploid parthenogenetic Artemia and sexual species from Central and East Asia to investigate the evolutionary origin of diploid parthenogenetic Artemia, and geographic origin of the parental taxa. Our results indicate that there are at least two, possibly three independent and recent maternal origins of parthenogenetic lineages, related to A. urmiana and Artemia sp. from Kazakhstan, but that the nuclear genes are very closely related in all the sexual species and parthenogegetic lineages except for A. sinica, who presumable took no part on the origin of diploid parthenogenetic strains. Our data cannot rule out either hybridization between any of the very closely related Asiatic sexual species or rare events of contagious parthenogenesis via rare males as the contributing mechanisms to the generation of genetic diversity in diploid parthenogenetic Artemia lineages
Quintessential Kination and Thermal Production of SUSY e-WIMPs
The impact of a kination-dominated phase generated by a quintessential
exponential model on the thermal abundance of Supersymmetric (SUSY) extremely
Weekly Interacting Massive Particles (e-WIMPs) is investigated. For values of
the quintessential energy-density parameter on the eve of nucleosynthesis close
to its upper bound, we find that: (i) the gravitino constraint is totally
evaded for unstable gravitinos; (ii) the thermal abundance of stable gravitinos
is not sufficient to account for the cold dark matter of the universe; (iii)
the thermal abundance of axinos can satisfy the cold dark matter constraint for
values of the initial (``reheating'') temperature well above those required in
the standard cosmology.Comment: To appear in the proceedings of 4th International Workshop On The
Dark Side Of The Universe (DSU 2008) 1-5 Jun 2008, Cairo, Egyp
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