Origami, the Japanese art of paper folding, has evolved considerably since it appeared in the western world over a century ago. Folding is simple, easy and cheap. So it’s no wonder that ...

Endemic in 21 countries in the Americas, infection by the parasite Trypanosoma cruzi affects some 6 million people, with an annual incidence of 30,000 new cases in the region, leading to 14,000 ...

Freshly harvested cysts were stained with acridine orange and ethidium bromide both at a final concentration of 100 μg ml −1 in PBS 19, observed under a wide-field fluorescence microscope and ...