On the cohomology of surfaces with PG = q = 2 and maximal Albanese dimension

In this paper we study the cohomology of smooth projective complex surfaces S of general type with invariants pg = q = 2 and surjective Albanese morphism. We show that on a Hodge-theoretic level, the cohomology is described by the cohomology of the Albanese variety and a K3 surface X that we call the K3 partner of S. Furthermore, we show that in suitable cases we can geometrically construct the K3 partner X and an algebraic correspondence in S 7X that relates the cohomology of S and X. Finally, we prove the Tate and Mumford\u2013Tate conjectures for those surfaces S that lie in connected components of the Gieseker moduli space that contain a product-quotient or a mixed surface

First evidence for Holocene rainfall in the Tanezrouft hyperdesert and its margins

International audienc

The Sahara in northern Mali: man and his environment between 10,000 and 3500 years bp. (Preliminary results)

International audienc

Horti medici amstelodamensis rariorum tam Orientalis : quàm Occidentalis Indi\ue6, aliarumque peregrinarum plantarum, magno studio ac labore, sumptibus Civitatis amstelodamensis, long\ue2 annorum serie collectarum, descriptio et icones ad vivum \ue6ri incis\ue6 /

v.

The argan - multipurpose tree of Morocco

Joseph Hooker and John Ball, writing of Argania spinosa (L.) Skeels, said that "this tree is rightly regarded as the most interesting vegetable product of Marocco, being confined to that empire and to a very circumscribed area in it, belonging to an almost exclusively tropical family, yielding a most important article of diet to the inhabitants, and a wood that for hardness and durability rivals any hitherto described" (Hooker & Ball, 1878). More than a century later the argan continues to be of manifold interest; to the botanist and ecologist because of its apparent Moroccan endemism and its disjunct distribution in relation to its family, the Sapotaceae; to the food technologist because of its highly nutritious oil whose untapped commercial potential is hindered by problems with its extraction; and to foresters and local inhabitants because of its central role as a stabilizer of soil and as a source of fuel and food for goats. There must now, however, be added a further interest in the argan: a grave concern for its future

Spatial glyphosate and AMPA redistribution on the soil surface driven by sediment transport processes – A flume experiment

This study investigates the influence of small-scale sediment transport on glyphosate and AMPA redistribution on the soil surface and on their off-site transport during water erosion events. Both a smooth surface (T1) and a surface with “seeding lines on the contour” (T2) were tested in a rainfall simulation experiment using soil flumes (1 × 0.5 m) with a 5% slope. A dose of 178 mg m−2 of a glyphosate-based formulation (CLINIC®) was applied on the upper 0.2 m of the flumes. Four 15-min rainfall events (RE) with 30-min interval in between and a total rainfall intensity of 30 mm h−1 were applied. Runoff samples were collected after each RE in a collector at the flume outlet. At the end of the four REs, soil and sediment samples were collected in the application area and in four 20 cm-segments downslope of the application area. Samples were collected according to the following visually distinguished soil surface groups: light sedimentation (LS), dark sedimentation (DS), background and aggregates. Results showed that runoff, suspended sediment and associated glyphosate and AMPA off-site transport were significantly lower in T2 than in T1. Glyphosate and AMPA off-site deposition was higher for T2 than for T1, and their contents on the soil surface decreased with increasing distance from the application area for all soil surface groups and in both treatments. The LS and DS groups presented the highest glyphosate and AMPA contents, but the background group contributed the most to the downslope off-site deposition. Glyphosate and AMPA off-target particle-bound transport was 9.4% (T1) and 17.8% (T2) of the applied amount, while water-dissolved transport was 2.8% (T1) and 0.5% (T2). Particle size and organic matter influenced the mobility of glyphosate and AMPA to off-target areas. These results indicate that the pollution risk of terrestrial and aquatic environments through runoff and deposition can be considerable. The downslope off-site transport and deposition of glyphosate and AMPA by water erosion onto the soil surface can be considerable, with the consequent pollution risk of off-target terrestrial environments