Due to ongoing global warming, seasonal patterns of aboveground net primary production (ANPP) may be altered by temperature trends. Of particular interest is the association between ANPP and at beginning growing season (the period encompassing minimum maximum ANPP), where two contrasting mechanisms are in tension. On one hand, restrictions exerted low temperatures winter relaxed, increasing slo...

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Alejandro Ayala, J. Magnin, Luis Manuel Montaño and Eduardo Rojas Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Apartado Postal 70-543, México Distrito Federal 04510, México. Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150-Urca CEP 22290-180, Rio de Janeiro, Brazil. Centro de Investigación y de Estudios Avanzados del IPN, Apartado Postal 14-740, Méx...

Electron Microscopy: Daniel C. Pease .............. 543 Incorporation of C14 From Carboxyl-labeled dl-Alanine Into the Proteins of Liver Slices: Ivan D. Frantz, Jr., Robert B. Loftfield, and Warren W. Miller ........ ...................... 544 Isolation of Avian Pneumoencephalitis (Newcastle Disease) Virus From the Yolk Sac of Four-Day-Old Chicks, Embryos, and Infertile Eggs: P. D. DeLay 545 An...

Michael A. Hohensee, Ralf Lehnert, 3 David F. Phillips, and Ronald L. Walsworth 4 Department of Physics, Harvard University, Cambridge, Massachusetts, 02138, USA Max–Planck–Institut für Physik, Föhringer Ring 6, 80805 München, Germany Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A. Postal 70-543, 04510 México D.F., Mexico Harvard–Smithsonian Center for Astrophysics,...