Copépodes pélagiques du plateau ivoirien. Utilisation de I'analyse des correspondances dans l'étude des variations saisonnières

Several 'analyses factorielles des correspondences' were used with the numerical data of planktonic copepods issued from a 1 year sampling programme at different stations of the Ivorian shelf. The main results were the following: (1) 'Ecological seasons' approximately corresponding to hydrological seasons may be defined for planktonic populations. (2) Each 'season' is characterized by one group of species, whose maximum abundance occurs in this period. (3) The same definition of ecological season is obtained whether all species present are used or whether only the most important ones are used. (4) The first principal axes may be interpreted as temperature and salinity or as the station's distance from shore

Multipartite entanglement, quantum-error-correcting codes, and entangling power of quantum evolutions

We investigate the average bipartite entanglement, over all possible divisions of a multipartite system, as a useful measure of multipartite entanglement. We expose a connection between such measures and quantum-error-correcting codes by deriving a formula relating the weight distribution of the code to the average entanglement of encoded states. Multipartite entangling power of quantum evolutions is also investigated.Comment: 13 pages, 1 figur

Copépodes pélagiques du plateau ivoirien. 2 - Utilisation de l'arbre de longueur minimum dans le classement des récoltes

The minimum spanning tree algorithm is used to classify two sets of planktonic copepod samples. This algorithm links the samples the distance of which is minimum, without doing a loop, so that the sum of the segment lengths is minimum. The authors estimated the distance between samples by 2 different ways: by a coefficient of association the Jaccard's index - and by the x2 distance. Jaccard's index is not retained but the use of the x2 distance allows comparison with the 'analyse factorielle des correspondances'. The results are discussed from an ecological point of view

Mare Incognitum: A Glimpse into Future Plankton Diversity and Ecology Research

Chust, Guillem ... et al.-- 9 pages, 1 figure.-- Corrigendum: Mare Incognitum: A Glimpse into Future Plankton Diversity and Ecology Research, Frontiers in Marine Science 4: 122 (2017) https://doi.org/10.3389/fmars.2017.00122With global climate change altering marine ecosystems, research on plankton ecology is likely to navigate uncharted seas. Yet, a staggering wealth of new plankton observations, integrated with recent advances in marine ecosystem modeling, may shed light on marine ecosystem structure and functioning. A EuroMarine foresight workshop on the “Impact of climate change on the distribution of plankton functional and phylogenetic diversity” (PlankDiv) identified five grand challenges for future plankton diversity and macroecology research: (1) What can we learn about plankton communities from the new wealth of high-throughput “omics” data? (2) What is the link between plankton diversity and ecosystem function? (3) How can species distribution models be adapted to represent plankton biogeography? (4) How will plankton biogeography be altered due to anthropogenic climate change? and (5) Can a new unifying theory of macroecology be developed based on plankton ecology studies? In this review, we discuss potential future avenues to address these questions, and challenges that need to be tackled along the wayThis research was funded by the EuroMarine Network (http://www.euromarinenetwork.eu), through the organization of the PlankDiv EuroMarine Foresight workshop, held at the Observatoire Océanographique de Villefranche-sur-mer, Villefranche-sur-mer, France, in March 2016, and cofounded by the Basque Government (Department Deputy of Agriculture, Fishing and Food Policy). The PlankDiv workshop was also supported by the Laboratoire d'Océanographie de Villefranche-sur-mer (LOV, UPMC/CNRS), the PlankMed action of WP5 MERMEX/MISTRAL, and by the French national programme EC2CO-LEFE (FunOmics project).Peer Reviewe

Two attacks on rank metric code-based schemes: RankSign and an Identity-Based-Encryption scheme

RankSign [GRSZ14a] is a code-based signature scheme proposed to the NIST competition for quantum-safe cryptography [AGHRZ17] and, moreover, is a fundamental building block of a new Identity-Based-Encryption (IBE) [GHPT17a]. This signature scheme is based on the rank metric and enjoys remarkably small key sizes, about 10KBytes for an intended level of security of 128 bits. Unfortunately we will show that all the parameters proposed for this scheme in [AGHRZ17] can be broken by an algebraic attack that exploits the fact that the augmented LRPC codes used in this scheme have very low weight codewords. Therefore, without RankSign the IBE cannot be instantiated at this time. As a second contribution we will show that the problem is deeper than finding a new signature in rank-based cryptography, we also found an attack on the generic problem upon which its security reduction relies. However, contrarily to the RankSign scheme, it seems that the parameters of the IBE scheme could be chosen in order to avoid our attack. Finally, we have also shown that if one replaces the rank metric in the [GHPT17a] IBE scheme by the Hamming metric, then a devastating attack can be found

Associations entre récepteurs opioïdes : vers de nouvelles stratégies thérapeutiques pour la douleur et l’addiction

Opioid receptors modulate numerous physiological functions. These receptors can associate each other to form a new functional entity named heteromer, which possesses specific functional properties. In vivo data suggest a crucial role for opioid heteromers in acute or chronic pain as well as addiction, pointing them as a new therapeutic target for the treatment of these pathologies

MÆRKET AF FÆNGSLET – FØLELSERS ROLLE I ETNOGRAFISK FÆNGSELSFORSKNING

Prisons inevitably leave their mark on all who pass through their gates. In this article two psychologists reflect on how prisons left their mark during our ethnographic fieldwork in developing countries. Via reflection on our own experiences the article advances thediscussion of the role of emotions in prison ethnographies. The article is based on a meta- analysis of field notes with a focus on emotional reactions as recorded and revealed in the field notes. Through this analysis the article illustrates how increased self-reflectionand awareness of researchers’ subjective experience can contribute to a better understanding of research as a particular, situated practice thereby enhancing our understanding of prisons and their consequences

MÆRKET AF FÆNGSLET – FØLELSERS ROLLE I ETNOGRAFISK FÆNGSELSFORSKNING

Prisons inevitably leave their mark on all who pass through their gates. In this article two psychologists reflect on how prisons left their mark during our ethnographic fieldwork in developing countries. Via reflection on our own experiences the article advances thediscussion of the role of emotions in prison ethnographies. The article is based on a meta- analysis of field notes with a focus on emotional reactions as recorded and revealed in the field notes. Through this analysis the article illustrates how increased self-reflectionand awareness of researchers’ subjective experience can contribute to a better understanding of research as a particular, situated practice thereby enhancing our understanding of prisons and their consequences