Nitrogen, fat-balances and plasma-aminograms in low birthweight infants fed three modifications of lyophilised human milk : V. Melichar 1, H. Wolf 2, U. Burger2, M. Mikova 1, M. Janovsky 1, K. Beyreiss 3, J. Boehm 3 and R. Klen 4. 1 Research Institute for Mother and Child Care, Prague, C.S.S.R.; 2 Department of Paediatrics, Justus-Liebig-University, Giessen, F.R.G.; 3 Children's Hospital, Karl-Marx-University, Leipzig, G.D.R.; and 4 Tissue Bank, University Hrdes Králové, C.S.S.R.