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2010 Popa R., Necessity, futility and the possibility of defining life are all embedded in its origin as a punctuated-gradualism, Origins of Life and Evolution of the Bioshpere, 40(2): (DOI 10.1007/s11084-010-9198-x).

2010 Boone J.E. and R. Popa, Molecular techniques in microbiology laboratories, Fountainhead Press, Southlake, TX.

2010 Scorei R.I and R. Popa, Using Boron-containing Compounds as Anticancer Agents (a Minireview of Targets, Mechanisms and Benefits), Anti-cancer Agents in Medicinal Chemistry, 10:346-351. 

2009 Popa R., Book review, Amino Acids and the Asymmetry of Life, U. Meierhenrich, Astrobiology. 9: 696-696.

2009 Boone J.E. and R. Popa, Basic techniques in microbiology laboratories, Fountainhead Press, Southlake, TX.

2009 Finzi-Hart J., J. Pett-Ridge, P. Weber, R. Popa, S. Fallon, T. Gunderson, I. Hutcheon, K. Nealson and D. Capone, Fixation and fate of carbon and nitrogen in the cyanobacterium Trichodesmium using nanometer Secondary Ion Mass Spectrometry (NanoSIMS), PNAS, 106:6345-6350. 

2009 Popa R., M.J. Mashall, H. Nguyen and S. Brauer, Requirements, Benefits and Limitations and of ARISA Intra-Genomic Diversity Fingerprinting, Journal of Microbiological Methods, 7:111-118. http://dx.doi.org/10.1016/j.mimet.2009.06.005. 

2009 Popa R., W. Fang, K.H. Nealson, V. Souza-Egipsy, T.S. Berquó, S.K. Banerjee, L.R. Penn, Using oxidative stress to express arrested growth of magnetic particles in Magnetospirillum magneticum AMB-1, International Microbiology, 12:49-58. 

2007 Scorei R.I., V.M. Cimpoiaşu and R. Popa, TD-1H NMR measurements show enantioselective dissociation of ribose and glucose in the presence of H217O, Astrobiology, 7: 733-744. 

2007 Popa R., P. Weber, J. Pett-Ridge, J. Finzi, S. Fallon, I.D. Hutcheon, K.H. Nealson and D.G. Capone, Carbon and nitrogen fixation and metabolite exchange in and between individual cells of Anabaena oscillarioides, The ISME Journal, 1:354-360.

2006 Capone D., R. Popa, B. Flood and K.H. Nealson, Follow the nitrogen, Science, 312:708-709. 

2006 Fisk M.R., R. Popa, O.U. Mason, M.C. Storrie-Lombardi, and E.P. Vincenzi, Iron-magnesium silicate bioweathering on Earth (and Mars?), Astrobiology, 5:48-68. 

2005 Abboud R., R. Popa, V. Souza-Egipsy, C.S. Giometti, S. Tollaksen, J.J. Mosher, R.H. Findlay and K.H. Nealson, Low temperature growth of Shewanella oneidensis MR-1. Appl. Environ. Microbiol. 71:811-816. 

2005 Banerjee S.K., R.L. Penn, T. Berquo, Y. Guyodo and R. Popa, Accurate multidisciplinary identification of nanophase iron minerals in simulated pedogenic environment, Geochim. Cosmochim. Acta, 69:A512-A512. 

2005 Nealson K.H. and R. Popa, Metabolic diversity in the microbial world: relevance to exobiology, In: Gadd G.M., K.T. Temple and H.M. Lapin-Scott (eds.), Micro-organisms and Earth Systems, Advances in Geomicrobiology, 151-171, Cambridge University Press. 

2005 Nealson K.H. and R. Popa, Introduction and Overview: What do we know for sure? Chapter 1. in Lüttge A. and R. Rye (eds.), Quantitative Approaches Towards Biogeochemistry: Processes, Scaling, and Interfaces, American Journal of Science, Yale University, New Haven, pp.1-21. 

2005 Kus E., R. Abboud, R. Popa, K. Nealson and F. Mansfeld, The concept of bacterial battery, Corrosion Science, 47:1063-1069. 

2004 Popa R. and B.K. Kinkle, Controlled Mineralization of Pyrite by Thiomonas thermosulfatus str.51, Geomicrobiol. J., 21:193-206.  

2004 Popa R., A. Badescu and B.K. Kinkle, Pyrite framboids as biomarkers for iron-sulfur systems, Geomicrobiol. J. 21:1-14.

2004 Popa R., Between Necessity and Probability: Searching for the Definition and Origin of Life, Springer-Verlag, Heidelberg, Germany. 

2003 Fisk M.R., M.C. Storrie-Lombardi, S. Douglas, G.D. McDonald, R. Popa and A.I. Tsapin, 2004, Evidence of Biological Activity in Hawaiian Subsurface Basalts, Geochem. Geophys. Geosys, 4:1525-2027. 

2002 Cox L, R. Popa, K.H. Nealson and D. Bazylinsky, Organization of P-, S- and Fe-inclusions in a freshwater Magnetococcus, Geomicrobiol. J., 19:387-406. 

2000 Popa R. and B.K. Kinkle, Discrimination among iron sulfide species formed in microbial cultures, J. Microbiol. Meth., 42:167 174. 

1997 Vlasceanu L., B.K. Kinkle and R. Popa, Characterization of Thiobacillus thioparus Strain LV43 and its distribution in a chemoautotrophically-based groundwater ecosystem, Appl. Environ. Microbiol., 63:3123-27. 

1997 Popa R., A sequential scenario for the origin of biological chirality, J. Mol. Evol., 44:121-127. 

1995 Sarbu, S. M., C. Gheorghe, V. Popescu Jarnea, L. Vlasceanu, R. Popa and C. Lascu, Stable isotope studies in Movile Cave, Trav. Inst. Speol. "Emile Racovitza", 34:99 102. 

1994 Sarbu S.M., B.K. Kinkle, L. Vlasceanu, T.C. Kane and R. Popa, Microbiological characterization of a sulfide-rich groundwater ecosystem, Geomicrobiol. J., 12:175-182. 

1994 Sarbu S.M., L. Vlasceanu, P. Sheridan, B.K. Kinkle, T. Kane and R. Popa, Microbial Mats in a thermomineral sulfurous cave, in Lucas J. and P. Caumette (eds.), Microbial Mats, NATO ASI Series, G 35, Springer-Verlag. 

1993 Lascu C., S.M. Sarbu, R. Popa, L. Vlasceanu and S. Prodan, La grotte de Movile: Une faune hors du temps, La Recherche, 258:1092-1098. 

1991 Sarbu S.M. and R. Popa, Trophic structure in an aquatic troglobytic community based upon chemoautotrophic carbon fixation, Trav. Inst. Speol. "Emile Racovitza", 30:51-58. 

1991 Sarbu S.M., R. Popa and I. Goliat, Chemoautotrophic production in a thermomineral sulfurous cave, Trav. Inst. Speol. "Emile Racovitza", XXX, 59-61. 

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