The species of Epithemia ocellata （Ehr.） Kuetz. from Northeastern China were observed by scanning electron microscopy （SEM）. The studies on silica valve formation in different stages were made. At the early stage,...The species of Epithemia ocellata （Ehr.） Kuetz. from Northeastern China were observed by scanning electron microscopy （SEM）. The studies on silica valve formation in different stages were made. At the early stage, a Y-shaped raphe sternum was found. Areolae were made from virgae and vimines. In immature valves, the canal formation before the raphe fissure is visible. The raphe system, virgae and vimines （areolae） might be the early siliceous elements of the valve during morphogenesis. The formations of virgae and vimines are similar to that of Gephyria media W. Arnott. Rows of silica papillae formed gradually on the face of the valve. After the areolae were covered with silica and form rows of papillae, the outer valve surface could become mature. Details of the internal costae were observed in mature valves.展开更多
In 1569,Giorgio Vasari(1511-1574)completed a painting of the Madonna of the Rosary for the private chapel of the Capponi family in the church of Santa Maria Novella in Florence.In his Ricordanze(Book of Records),Vasar...In 1569,Giorgio Vasari(1511-1574)completed a painting of the Madonna of the Rosary for the private chapel of the Capponi family in the church of Santa Maria Novella in Florence.In his Ricordanze(Book of Records),Vasari explained the commission as well as documenting the assistance of his Florentine pupil,Jacopo Zucchi(1541-1590),in the completion of this painting.This essay discusses Vasari’s symbolism of the rosary as a reflection of the Tridentine Reform in Florence as well as a visual interpretation of Italian Mannerist painters on this devotional subject.展开更多
基金National Natural Science Foundation of China (30270111)Natural Science Foundation of Heilongjiang Province (C 2303)+1 种基金Project of Innovation Capacity of Teachers in University (1055G018)Post-doctor Start-up Fund of the Heilongjiang Provincial Government.
文摘The species of Epithemia ocellata （Ehr.） Kuetz. from Northeastern China were observed by scanning electron microscopy （SEM）. The studies on silica valve formation in different stages were made. At the early stage, a Y-shaped raphe sternum was found. Areolae were made from virgae and vimines. In immature valves, the canal formation before the raphe fissure is visible. The raphe system, virgae and vimines （areolae） might be the early siliceous elements of the valve during morphogenesis. The formations of virgae and vimines are similar to that of Gephyria media W. Arnott. Rows of silica papillae formed gradually on the face of the valve. After the areolae were covered with silica and form rows of papillae, the outer valve surface could become mature. Details of the internal costae were observed in mature valves.
文摘In 1569,Giorgio Vasari(1511-1574)completed a painting of the Madonna of the Rosary for the private chapel of the Capponi family in the church of Santa Maria Novella in Florence.In his Ricordanze(Book of Records),Vasari explained the commission as well as documenting the assistance of his Florentine pupil,Jacopo Zucchi(1541-1590),in the completion of this painting.This essay discusses Vasari’s symbolism of the rosary as a reflection of the Tridentine Reform in Florence as well as a visual interpretation of Italian Mannerist painters on this devotional subject.
