Life: the first two billion years

Life: the first two billion years.

Microfossils, stromatolites, preserved lipids and biologically informative isotopic ratios provide a substantial record of bacterial diversity and biogeochemical cycles in Proterozoic (2500-541 Ma) oceans that can be interpreted, at least broadly, in terms of present-day organisms and metabolic processes. Archean (more than 2500 Ma) sedimentary rocks add at least a billion years to the recorded...

The First Four Billion Years

The first billion years: new insights from geochemistry

Prologue: (V)ast globes. . . after reaching the last stages of ebullition, were coveredwith scoriae like bubbling foam. And the crust which covered the molten matter of the globe and which hardened from the fused condition would be like scoria, as happens with metals in the furnace. If then the great framework of the earth, the exposed rocks, the imperishable silicates, are almost entirely vitr...

Feeding in the two first years of life.

We evaluated the feeding practices of children younger than two years. This cross-sectional study was conducted in 2004-05. Data was obtained from the Population Study of Food Consumption in Belo Horizonte/ECAP-BH. The sample included 148 children younger than two years. We conducted interviews at home with mothers/guardians and surveyed the foods consumed in the past 24 hours, including breast...

Breastfeeding of Infants During The First Two Years of Life and Associated Factors based on BAZNEF Model in Sari, Iran

 Background and purpose: Breastfeeding in the first two years of life has great benefits in health promotion and preventing diseases. The aim of this study was to determine breastfeeding practices during the first two years of life based on BASNEF model in Sari, Iran, 2017. Materials and methods: In this cross-sectional study, 328 mothers with children younger than two years of age were selec...