New World tetraploid cottons contain Old World cytoplasm

New World tetraploid cottons contain Old World cytoplasm.

New World tetraploid cottons (Gossypium spp.) originated through hybridization of ancestral diploid species that presently have allopatric ranges in Asia-Africa (the A genome) and the New World tropics and subtropics (the D genome). Despite intensive study, the identity of the parental diploids and the antiquity of polyploidization remain unresolved. In this study, variation in the maternally i...

Old World Econometrics and New World Theory

This paper summarizes recent work on the econometrics of identification in rational expectations models by myself and Andreas Beyer. In this work, we discuss the relationship between structure and reduced form in linear rational expectations models and we apply our analysis to a class of new Keynesian models that are frequently used to inform the policy debate. We argue that the identifying ass...

Old new world

This spring sees two major anniversaries in the colonial history of Europe: Britain is commemorating the 200th anniversary of the abolition of its until then lucrative but cruel slave trade, and the US marks the 400th anniversary of the first permanent European settlement in Jamestown. The British Museum is also showing a collection of paintings and illustrations it holds, which represent the f...

Old world frog and bird vocalizations contain prominent ultrasonic harmonics.

Several groups of mammals such as bats, dolphins and whales are known to produce ultrasonic signals which are used for navigation and hunting by means of echolocation, as well as for communication. In contrast, frogs and birds produce sounds during night- and day-time hours that are audible to humans; their sounds are so pervasive that together with those of insects, they are considered the pri...

Some New World Lessons for the Old World