While the history and practices of collecting have received considerable attention over the past few decades, the notion of erasure – of the deleting, removal or destruction of material, whether deliberate or otherwise – has remained largely in the shadows. We challenge this neglect by placing erasure centre stage and treating it as a productive phenomenon in its own right. Indeed, we suggest that it forms a significant precondition for the very possibility of memory and collections. This article draws upon a recent turn to consider questions of forgetting, ignorance and ending to lay out the grounds for analysing the various roles played by erasure in making and unmaking our world. Inspired by Paul Connerton's discussion of different types of forgetting, we present five distinct forms of erasure that we regard as principally important: (i) repressive erasure, (ii) protective erasure, (iii) operative erasure, (iv) amending erasure and (v) calamitous and neglectful erasure. In each case, we discuss the characteristic logic of the erasure at hand and provide examples of the historical and media-specific forms in which it has been enacted. Our aim in doing so is to provide future researchers with some of the analytical tools and perspectives necessary to engage in further erasure studies. For if we are interested in making sense of the shifting and complex world we inhabit, then the interdisciplinary study of the compelling yet elusive phenomenon of erasure is an excellent place to start.

In this paper, I examine the properties of a construction in Korean speech that has not received much attention in the literature. I refer to the construction in question as the ‘stranded embedded clause’ (SEC). SECs are a special type of echoed utterance, where an utterance in the form of an embedded clause is repeated for various reasons. The characteristic properties of the SEC involve the fact that there can be a mismatch between the type of the clause indicated by the clause type marker that they contain and the actual illocutionary force of the utterance that is indicated by its prosody. The complementizer is also obligatory, despite the fact that no matrix clause element shows up—hence, the name stranded embedded clause. I propose a deletion-based analysis of SECs, where they start out as a full-fledged embedded clause in a complex sentence and undergo movement, followed by deletion of the rest of the clause. It should be noted that this is essentially how fragment answers (and some other ellipsis constructions) have been analysed in the literature. Indeed, I show that there is a parallelism between SECs and fragment answers, which I argue provides support for the deletion-based approach to the former.

The authors describe the occurrence of a small deletion localised on the short arm of chromosome 18 in a young female with a diagnosis of paranoid schizophrenia.

We report a rare association of interstitial deletion of 5p15.2-p13.3 with situs inversus, dextrocardia, L-loop of the ventricles, and transposition of great arteries: [I, L, L] Transposition of Great Arteries. We did not find such an association reported in the medical literature.

We deal with a random graph model evolving in discrete time steps by duplicating and deleting the edges of randomly chosen vertices. We prove the existence of an almost surely asymptotic degree distribution, with stretched exponential decay; more precisely, the proportion of vertices of degree d tends to some positive number cd > 0 almost surely as the number of steps goes to ∞, and cd ~ (eπ)1/2d1/4e-2√d holds as d → ∞.

Verhoeven WMA, Bon BV, Egger JIM, Hoischen A, Doelman JC. An adult female patient with ring chromosome 21: behavioural phenotype and results of high-resolution molecular characterisation.

Plasmodium falciparum parasites use multiple ligand-receptor interactions to invade human erythrocytes. Variant expression levels of members of the PfRh and PfEBA ligand families are associated with the use of different erythrocyte receptors, defining invasion pathways. Here we analyse a major polymorphism, a large sequence deletion in the PfRh2b ligand, and erythrocyte invasion profiles in uncultured Senegalese isolates. Parasites vary considerably in their use of sialic acid-containing and protease-sensitive erythrocyte receptors for invasion. The erythrocyte selectivity index was not related to invasion pathway usage, while parasite multiplication rate was associated with enhanced use of a trypsin-resistant invasion pathway. PfRh2b protein was expressed in all parasite isolates, although the PfRh2b deletion was present in a subset (~68%). Parasites with the PfRh2b deletion were found to preferentially utilize protease-resistant pathways for erythrocyte invasion. Sialic acid-independent invasion is reduced in parasites with the PfRh2b deletion, but only in isolates derived from blood group O patients. Our results suggest a significant role for PfRh2b sequence polymorphism in discriminating between alternative erythrocyte receptors for invasion and as a possible determinant of virulence.