Aliens — as we know them

Aliens — as we know them

Cis-spliced acceptors can be converted to trans-splicing acceptors if the donor site upstream is mutated, and similarly an SL addition site will be cis-spliced if a donor site is inserted upstream. What is the function of SL trans-splicing? SL addition provides the cell with an alternative way of capping mRNAs, a modification required for mRNA stability, transport and translation. The standard ...

Mitochondria as we don't know them.

Biochemistry textbooks depict mitochondria as oxygen-dependent organelles, but many mitochondria can produce ATP without using any oxygen. In fact, several other types of mitochondria exist and they occur in highly diverse groups of eukaryotes - protists as well as metazoans - and possess an often overlooked diversity of pathways to deal with the electrons resulting from carbohydrate oxidation....

Databases, But Not As We Know Them

Species, extinct before we know them?

Species are going extinct rapidly, while taxonomic catalogues are still incomplete for even the best-known taxa. Intensive fieldwork is finding species so rare and threatened that some become extinct within years of discovery. Recent bird extinctions in Brazil's coastal forests suggest that some species may have gone extinct before we knew of their existence.

Superior Capsule Reconstruction: What Do We Know?

The management of irreparable rotator cuff tears remains challenging. Since its introduction by Mihata in 2012, superiorcapsule reconstruction (SCR) has grown in popularity at an astonishingly rapid rate. The aim of this article is to providea comprehensive review of the available literature, in order to highlight what has so far been published on SCR,covering all aspects including biomechanica...