Animals under threat.

Este título forma parte de la serie Planeta bajo presión. La disminución de especies animales es una amenaza grave que afronta hoy la Tierra. La caza, la destrucción del hábitat, la contaminación, todos desempeñan un papel. Aquí se examinan las cuestiones relacionadas con animales en peligro de extinción a un ritmo más rápido que en el pasado, debido a la actividad humana, y su conservación en el futuro. Estudios de casos y estadísticas ofrecen una visión general de los problemas que nosotros, como comunidad mundial, debemos afrontar. Dirigido a lectores de edades a partir de doce años. Incluye referencias bibliográficas.

Animals : multicelled life.

Este título pertenece a una serie que ofrece en profundidad una visión de las células en todos los seres vivientes, su estructura y los procesos en que se basa la vida en la Tierra. Todos los animales, incluidos los seres humanos, están formados por millones de células. Aquí se ven las diferencias entre las células de una planta y las células de un animal. Se muestra como las células de un animal se adaptan a su actividad, estilo de vida móvil, y explora cómo estas células se especializan para realizar diferentes tareas, desde la lucha contra la infección hasta el transporte de nutrientes. Tiene índice, glosario, referencias bibliográficas y un cuadro de clasificación del reino animal.

Sobre les utopies, els animals i les figures del ciutad??

Resumen basado en el de la publicaci??n

Tolerance of ruminant animals to high dose in-feed administration of a selenium-enriched yeast

The objective of the study was to determine if there were adverse effects on animal health and performance when a range of ruminant animals species were fed at least 10 times the maximum permitted European Union (EU) selenium (Se) dietary inclusion rate (0.568 mg Se/kg DM) in the form of selenium enriched yeast (SY) derived from a specific strain of Saccharomyces cerevisiae CNCM I-3060. In a series of studies, dairy cows, beef cattle, calves and lambs were offered either a control diet which contained no Se supplement or a treatment diet which contained the same basal feed ingredients plus a SY supplement which increased total dietary Se from 0.15 to 6.25, 0.20 to 6.74, 0.15 to 5.86 and 0.14 to 6.63 mg Se/kg DM, respectively. The inclusion of the SY supplement (P < 0.001) increased whole blood Se concentrations, reaching maximum mean values of 716, 1,505, 1,377, and 724 ng Se/mL for dairy cattle, beef cattle, calves and lambs, respectively. Selenomethionine accounted for 10% of total whole blood Se in control animals whereas the proportion in SY animals ranged between 40 and 75%. Glutathione peroxidase (EC 1.11.1.9) activity was higher (P < 0.05) in SY animals when compared with controls. A range of other biochemical and hematological parameters were assessed, but few differences of biological significance were established between treatments groups. There were no differences between treatment groups within each species with regard to animal physical performance or overall animal health. It was concluded that there were no adverse effects on animal health, performance and voluntary feed intake to the administration of at least ten times the EU maximum, or approximately twenty times the US FDA permitted concentration of dietary Se in the form of SY derived from a specific strain of Saccharomyces cerevisiae CNCM I-3060.

Foods derived from animals: the impact of animal nutrition on their nutritive value and ability to sustain long-term health

Foods derived from domestic animals are a significant source of nutrients in the UK diet. However, certain aspects of some animal-derived foods, notably levels of saturated fatty acids, have given rise to concerns that these foods may contribute to the risk of cardiovascular disease, the metabolic syndrome and other conditions. However, the composition of the many animal-derived foods is not constant and can often be enhanced by manipulating the nutrition of the animal. This paper reviews these possibilities with particular attention to lipids, and draws attention to the fact that milk in particular, contains a number of compounds which may, for example, exert anti-carcinogenic effects. It is clear that the role of animal nutrition in creating foods closer to the optimum composition for long-term human health will not only be more relevant in the future, but will be vital in attempts to improve the health of the human population.