Metros y cronómetros relativistas: Luz y tiempo

La visió que la cosmologia moderna presenta de l'univers ha estat conseqüència d'una aventura humana en la qual els protagonistes han aportat idees noves, hores de treball, llargues nits d'observació, hipòtesis arriscades, disputes apassionades o aferrissaments a idees preconcebudes. Tot plegat, una història, ben interessant, amb què els astrònoms han construït la cosmologia actual. Mariners que solquen el cel, Premi Europeu de Divulgació Científica Estudi General, explica com les observacions astronòmiques, des de l'antiga Grècia fins als nostres dies, ja siga a ull nu, amb els...

The section devoted to iron in this volume reflects the tremendous progress in the area. Specifically cluster chemistry, ligand transformations and detailed structural results are more prominent in COMC II. The organic chemistry of ruthenium and osmium is an area which has burgeoned during the period since the publication of COMC. This is especially true for the cluster chemistry of these elements, which have provided most of the advances in this important field. Consequently, this volume will include an update (1981-1993) of the chemistry of mono- and bi-nuclear complexes of ruthenium and...

Soil is a pivotal component of the environment and the maintenance of soil quality is critical for ensuring the sustainability of the environment and the biosphere. The use of fertilizers has increased at a faster rate than global food production. Modern agriculture is dependent on phosphorus derived from phosphate rock, which is a non-renewable resource. It is needed to improve P acquisition efficiency for both low input and intensive agroecosystems. However, few studies have focused on cereal-legume interactions with regard to soil P. The objective of this work was to study the effects of...

"In Spanish text, infographics, fun facts, and up-close photos help readers explore the creepy, crawly lives of tarantulas and their important role in the world"--