Severi, F., Ann. di Mat. (III), 12, 55-79 (1905); Rend. Pal., 21, 257-282 (1906); Rend. Acc. Lincei (V), 30, 328-332 (1° sem. 1921). Cf. also 0. Zariski, Algebraic Surfaces, Chelsea, New York, 1948, pp. 88-89 and pp. 126-128. 2 Weil, A., VariltMs abeliennes et courbes algtbriques, Act. Sc. et Ind. no. 1064, lHermann et Cie, Paris, 1948. 3Matsusaka, T., Kyoto Math. Mem., 26, 51-62 (1950). 4 I am...

Heracleum mantegazzianum has been the focus of a 40 month in depth study by eight research groups across Europe, one of the most detailed studies undertaken in Europe of a nonagricultural weed. Lessons learned from this research are linked to investigations of other alien invasive species and their management. The value of understanding the ecology of the species in its native range is consider...

chemical composition of the essential oils extracted from the leaves, stems, flowers and seeds of  heracleum rechingeri manden. were analyzed by gc and gc/ms. twenty-four components were characterized for the leaf oil with octyl acetate(47.2%), octanol(15.2%) and e-caryophyllen (5.7%) as the main constituents. 25 compounds were identified in the stem oil with elemicin (65.3%), octyl acetate (13...

The Argentine ant (Linepithema humile) is an invasive species that disrupts the balance of natural ecosystems by displacing indigenous ant species throughout its introduced range. Previous studies that examined the mechanisms by which Argentine ants attain ecological dominance showed that superior interference and exploitation competition are key to the successful displacement of native ant spe...

The formation of droplets of ants Linepithema humile (Mayr) is observed under certain experimental conditions: a fluctuating aggregate forms at the end of a rod and a droplet containing up to 40 ants eventually falls down. When the flux of incoming ants is sufficient, this process can continue for several hours, leading to the formation and fall of tens of droplets. Previous work indicates that...

BILGE YILDIZ, ANNA NIKIFOROVA and SIDNEY YIP 1 Department of Nuclear Science and Engineering, Massachusetts Institute of Technology Cambridge, MA 02139, USA 2 Department of Nuclear Science and Engineering and Department of Materials Science and Engineering Massachusetts Institute of Technology, Cambridge, MA 02139, USA 3 Center for Advanced Nuclear Energy Systems, MIT Corresponding author. E-ma...

Markus Kubicek,* Zhuhua Cai, Wen Ma, Bilge Yildiz, Herbert Hutter, and Jürgen Fleig Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria, and Laboratory for Electrochemical Interfaces, Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139,...

AIM: As accurate and up-to-date distribution data for plant species are rarely available, cumulative records over long periods of time are frequently used for mapping distributions, without taking into account that species do not persist in their historical localities forever. However, persistence is highly relevant in changing modern landscapes, especially for invasive species that dynamically...

modification in reducible oxides: The case of Pr0.1Ce0.9O22d thin films Maria N. Luckyanova, Di Chen, Wen Ma, Harry L. Tuller, Gang Chen, and Bilge Yildiz Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Depar...