caa a22 4500 477083900 CHVBK 20180405111457.0 cr unu---uuuuu 170330e19960401xx s 000 0 eng 10.1007/BF01919546 doi (NATIONALLICENCE)springer-10.1007/BF01919546 Ultrastructure of 30-40 million year old leaflets from Dominican amber ( Hymenaea protera , Fabaceae: Angiospermae) [Elektronische Daten] [H. Poinar, R. Melzer, G. Poinar Jr.] Hymenaea protera leaflet fossils entombed in amber, dated at 30 to 40 million years (mine strata and exomethylene dating) were observed by both light and transmission electron microscopy. Ultrastructure preservation in these leaflets shows the presence of chloroplasts with thylakoid membranes, cell walls, mitochondria with associated endoplasmic reticulum, nuclei, and xylem tissue. Tissues show varying degrees of degradation; however, natural resin, which has perfused the cells, seems to maintain the structural integrity of the membranes and walls. We conclude that preservation of amber entombed organisms results from dehydration and slow fixative properties leaving the ultrastructure in excellent condition. These findings parallel reports on the exceptional preservation of amino acids and of DNA in amber-entombed organisms. Birkhäuser Verlag, 1996 Fossil plants nationallicence amber nationallicence Hymenaea leaflets nationallicence ultrastructure of fossil material nationallicence amber preserved tissues nationallicence molecular preservation nationallicence Poinar H. Zoological Instute, University of Munich, Postfach 202136, D-80021, Munich, (Germany) aut Melzer R. Zoological Instute, University of Munich, Postfach 202136, D-80021, Munich, (Germany) aut Poinar Jr. G. Department of Entomology, Oregon State University, 97331, Corvallis, Oregon, USA aut Experientia Birkhäuser-Verlag 52/4(1996-04-01), 387-390 0014-4754 52:4<387 1996 52 18 https://doi.org/10.1007/BF01919546 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01919546 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Poinar H. Zoological Instute, University of Munich, Postfach 202136, D-80021, Munich, (Germany) aut NATIONALLICENCE 700 1- Melzer R. Zoological Instute, University of Munich, Postfach 202136, D-80021, Munich, (Germany) aut NATIONALLICENCE 700 1- Poinar Jr G. Department of Entomology, Oregon State University, 97331, Corvallis, Oregon, USA aut NATIONALLICENCE 773 0- Experientia Birkhäuser-Verlag 52/4(1996-04-01), 387-390 0014-4754 52:4<387 1996 52 18 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer