An Acetylenic Alkaloid from the Calcareous Sponge Leucetta sp.

A new acetylenic alkaloid was isolated from the sponge Leucetta sp. The structure was established by analyzing spectroscopic data. The alkaloid showed cytotoxicity IC50 2.5 μg/mL against NBT-T2 cells

Nigerian Social Formation and Separatist Agitations: Scoping the Inextricable Nexus

In the last two decades or so, there has been a surge in violent separatist agitations in Nigeria. There isthe Indigenous People of Biafra (IPOB) in the South-east, the Yoruba Nation Movement in the South-west, agitation for resource control in the South-south, the Boko Haram insurgency in the north, and a plethora of other violent criminal activities across the country. The paper examined the nature of the Nigerian social formation and how it has driven violent separatist agitations in the polity, in the last two decades. Data for the study was generated from both primary and secondary sources. Primary data was derived from interviews, while secondary data was got from extensive library search. The Structural Conflict Theory was used as the framework of analysis, and information generated was analysed descriptively in line with the objectives of the study. The analysis established there is an inextricable nexus among the multi-ethnic nature of the Nigerian social formation; the multi-religious composition of the country; the rentier state system being operated in Nigeria, and the rise in violent agitations in the country.&nbsp

QUAPEVA: Variable High Gradient Permanent Magnet Quadrupole

International audienceWe present the magnetic and the mechanical design of tunable high gradient permanent magnet (PM) quadrupoles. The tunable gradient of the so-called QUAPEVAS extends from 100T/m up to 200T/m. Seven of them with various lengths, ranging from 26mm up to 100mm, for different integrated quadrupole strengths were manufactured. The measured magnetic performance of these devices is also reported. These devices were successfully developed to transport laser plasma accelerated electron beam. Such applications have however less stringent multipole harmonic content constraints than diffraction limited Light sources. Trails for lowering the multipole harmonics will be discussed