Kipus: revista andina de letras. 23 (Reseñas)

Presenta las reseñas de los sigietnes libros: ALICIA ORTEGA CAICEDO, EDIT., Sartre y nosotros, Quito, Universidad Andina Simón Bolívar, Sede Ecuador / Editorial El Conejo, 2007, 331 pp. -- SANTIAGO RONCAGLIOLO, Abril Rojo, Madrid, Alfaguara, 2006, 344 pp. -- RAÚL VALLEJO, Missa Solemnis, Quito, Seix Barral, 2008, 128 pp. -- LEONARDO VALENCIA, El libro flotante de Caytran Dölphin, Quito, Paradiso Editores, 2006, 343 pp. -- PABLO AYALA ROMÁN, El mundo del rock en Quito, Quito, Instituto de Estudios Avanzados / Corporación Editora Nacional, 2008, 182 pp. -- GABRIELA ALEMÁN, Poso Wells, Quito, Eskeletra, 2007, 393 pp. -- RAMIRO ARIAS, Todo el sabor tropical, Quito, Eskeletra, 2008, 411 pp. -- HUGO LARREA BENALCÁZAR, Cuando tú te hayas ido, Quito, El Conejo, 2008, 383, pp. -- ERNESTO CARRIÓN, Muerte de Caín, Quito, Casa de la Cultura Ecuatoriana, 2007, 305 pp. -- CÉSAR DÁVILA ANDRADE, Obra poética, Quito, Colección Memoria de Vida, vol. 8, Casa de la Cultura Ecuatoriana, 2007, 358 pp. -- GILDA HOLST, Bumerán, Guayaquil, b@ez.editor.es, 2006, 119 pp. -- FERNANDO AMPUERO, Puta linda, Lima, Planeta, 2006, 127 pp.

Euthydemoss of Bactria

Euthydemos I (ca. 260–200 bce) was king of Bactria from around 230. He founded a dynasty which, most notably under his son Demetrios I, extended the control of the Greco-Bactrian kings south of the Hindu Kush into Arachosia and India.

Conditional transgenic expression of fibroblast growth factor 9 in the adult mouse heart reduces heart failure mortality after myocardial infarction

BACKGROUND: Fibroblast growth factor 9 (FGF9) is secreted from bone marrow cells, which have been shown to improve systolic function after myocardial infarction (MI) in a clinical trial. FGF9 promotes cardiac vascularization during embryonic development but is only weakly expressed in the adult heart. METHODS AND RESULTS: We used a tetracycline-responsive binary transgene system based on the α-myosin heavy chain promoter to test whether conditional expression of FGF9 in the adult myocardium supports adaptation after MI. In sham-operated mice, transgenic FGF9 stimulated left ventricular hypertrophy with microvessel expansion and preserved systolic and diastolic function. After coronary artery ligation, transgenic FGF9 enhanced hypertrophy of the noninfarcted left ventricular myocardium with increased microvessel density, reduced interstitial fibrosis, attenuated fetal gene expression, and improved systolic function. Heart failure mortality after MI was markedly reduced by transgenic FGF9, whereas rupture rates were not affected. Adenoviral FGF9 gene transfer after MI similarly promoted left ventricular hypertrophy with improved systolic function and reduced heart failure mortality. Mechanistically, FGF9 stimulated proliferation and network formation of endothelial cells but induced no direct hypertrophic effects in neonatal or adult rat cardiomyocytes in vitro. FGF9-stimulated endothelial cell supernatants, however, induced cardiomyocyte hypertrophy via paracrine release of bone morphogenetic protein 6. In accord with this observation, expression of bone morphogenetic protein 6 and phosphorylation of its downstream targets SMAD1/5 were increased in the myocardium of FGF9 transgenic mice. CONCLUSIONS: Conditional expression of FGF9 promotes myocardial vascularization and hypertrophy with enhanced systolic function and reduced heart failure mortality after MI. These observations suggest a previously unrecognized therapeutic potential for FGF9 after MI.

Power allocation strategies for distributed space-time codes in two-way relay networks

We study a two-way relay network (TWRN), where distributed space-time codes are constructed across multiple relay terminals in an amplify-and-forward mode. Each relay transmits a scaled linear combination of its received symbols and their conjugates,with the scaling factor chosen based on automatic gain control. We consider equal power allocation (EPA) across the relays, as well as the optimal power allocation (OPA) strategy given access to instantaneous channel state information (CSI). For EPA, we derive an upper bound on the pairwise-error-probability (PEP), from which we prove that full diversity is achieved in TWRNs. This result is in contrast to one-way relay networks, in which case a maximum diversity order of only unity can be obtained. When instantaneous CSI is available at the relays, we show that the OPA which minimizes the conditional PEP of the worse link can be cast as a generalized linear fractional program, which can be solved efficiently using the Dinkelback-type procedure.We also prove that, if the sum-power of the relay terminals is constrained, then the OPA will activate at most two relays.