THE problem of estimating the total surface area of the blood vessels in a cubic millimetre of tissue which arose in an examination of tumours 1 is dealt with in this communication. First, the ideal ...

Abstract: The development of an electron cloud in the vacuum chambers of high intensity positron and proton storage rings may limit machine performance. The suppression of electrons in a magnet is a ...

Abstract: Full-waveform inversion (FWI) is increasingly used in land seismic exploration to achieve high-resolution near-surface models. In complex near-surface environments, however, FWI is ...

Gas exchange occurs in the alveoli which are found in the lungs. Many spongy mesophyll cells are in contact with the air spaces, providing a large surface area for gas exchange to happen. The spongy ...

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The holy city of Teotihuacan ('the place where the gods were created') is situated some 50 km north-east of Mexico City. Built between the 1st and 7th centuries A.D., it is characterized by the vast ...