MATHEMATICS » TUDOR BARBU, The International Symposium on Differential Models in Geometry, Computer Science and Hydrotechnics, DiMoGeCH 2019 - Preface ...............................7 » DAVID R. BLAIR, Associated metrics for Bourgeois' contact forms ..........................9 » GABRIELA CONSTANTIN, Identities complete induction method .........................21 » TUDOR BARBU, A survey of non-linear PDE-based structural image interpolation models ............................................................................................................................33 » V. VOLPERT, Nonlocal reaction-diffusion equations in population dynamics..........................................................................................................................47 » SEMSI EKEN MERIC, EROL KILIC, On submanifolds of Riemannian manifolds addmitting a Ricci soliton...............................................................................................59 » M. T. K. ABBASSI, N. AMRI, Fiber-preserving conformal vector field of frame bundles with natural Riemannian metric ......................................................................67 » CORNELIA LIVIA BEJAN, CEM SAYAR, Generalized skew-semi invariant submanifolds of almost paracontact manifolds .............................................................73 ECOLOGY OF ORGANISMS » OVIDIU COPOȚ, CĂTĂLIN TĂNASE, Lignicolous fungi ecology – biotic and abiotic interactions in forest ecostsyems ......................................................................81 CHEMISTRY » MARIUS ȘTEFAN, MIHAIL LUCIAN BÎRSĂ, Flavonoids – An amazing group of compounds with potent antimicrobial properties .......................................................111 ANTHROPOLOGY » VASILICA-MONICA GROZA, OZANA-MARIA PETRARU, MARIANA POPOVICI, LUMINIȚA BEJENARU, Bioanthropological analysis of the 18th-19th century skeletal samples discovered at the "Adormirea Maicii Domnului" Roman Catholic Cathedral of Iași (Romania)........................................................................141 » VASILICA-MONICA GROZA, OZANA-MARIA PETRARU, MARIANA POPOVICI, LUMINIȚA BEJENARU, Ancient human skeleton (15th-19th centuries) with mastoid osteome, discovered in Iași (Romania) .................................................163 PHILOSOPHY OF SCIENCE »DAN GABRIEL SÎMBOTIN, The unity of science between epistemic inertia and nowadays scientific necessity ......................................................................................171