Comptes rendus de l'Académie bulgare des Sciences

C O N T E N T S

MATHEMATICS

01   Ivo M. Michailov, Ivan S. Ivanov, Nikola P. Ziapkov   Noether’s Problem for Abelian Extensions of Bicyclic and Metacyclic p-Groups

02   Hristo Kiskinov, Andrey Zahariev, Stoyan Zlatev   Permanence of the Positive Solutions of the Generalised Haematopoiesis Mackey–Glass Model

03   Yee S. Gan, Sherzod Turaev, Wan H. Fong, Nor H. Sarmin   Computational Power of Weighted Splicing Systems

PHYSICS

04   Gizo Bokuchava, Igor Papushkin, Peter Petrov   Residual Stress Study by Neutron Diffraction in the Charpy Specimens Reconstructed by Various Welding Methods

CHEMISTRY

05   Albena Detcheva, Ralitsa Velinova, Elisaveta Ivanova, Juri Jordanov, Metody Karadjov   Colouration of Medieval Glass Braceletes Studied by Total Reflection X-ray Fluorescence Analysis

06   Sharif F. Zaman, Mohammad Daous, Lachezar Petrov   A DFT Study of Hydrogen Dissociation over MoP(001) Plane

07   George Angelov, Stanislava S. Boyadzhieva, Silviya S. Georgieva   Modelling of Process Kinetics for Extraction of Polyphenols from Rosehip Fruits

BIOLOGY

08   Ekaterina Kozuharova, Vladimir Kochmarov, Eli Kachaunova   On the Autecology of Bulgarian Arum (Araceae) Species

09   Georgi B. Angelov   Systematic Relationships among Melica Transsilvanica, M. Ciliata and M. uniflora (Poaceae) as Inferred from Isoenzymes

10   Desislava Ivanova, Tihomir Vachev, Georgi Minkov, Galina Yahubyan, Gergana Zahmanova, Samir Naimov, Mariyana Gozmanova   Expression Changes of MYB1 and ACO Genes upon Potato Spindle Tuber Viroid Infection of Phelipanche ramosa L.

11   Lilyana Koleva, Bernd Ulber, Gerhard A. Wolf   Studies on the Effect of Collembola Species Onychiurus fimatus Gisin (Onychiuridae) and Folsomia candida Willem (Isotomidae) on the Infection of Sugar Beet with Pythium ultimum Trow

12   Alexander Hristov, Nelly Christova, Lilyana Nacheva, Ivanka Stoineva, Lyudmila Kabaivanova   Biodegradation Potential of Nocardia farcinica BN26 for Xenobiotics Mineralisation

GEOLOGY

13   Stoyan Vergiev, Mariana Filipova Marinova, Liviu Giosan, Danail Pavlov, Vladimir Slavchev   Pollen-based Quantitative Reconstruction of Holocene Vegetation in Varna Lake Area (Northeastern Bulgaria) Using Modelling and Simulation Approach

GEOPHYSICS

14   Dimcho Solakov, Stela Simeonova, Luminita Ardeleanu, Irena Alexandrova, Petya Trifonova, Carmen Cioflan   Hazard Assessment for Romania–Bulgaria Crossborder Region

SPACE RESEARCH

15   Alexander Mishev, Peter I. Y. Velinov   Influence of Low Energy Hardron Interaction Models on Atmospheric Ionisation Due to Cosmic Ray Heavy Nuclei

ENGINEERING SCIENCES

16   Mincho Hadjiski, Kosta Boshnakov   Nonlinear Hybrid Control of Copper Converter

MEDICINE

17   Mina A. Ivanova, Tanya N. Christova, Christian S. Kostov, Ivo M. Kremensky, Vanio I. Mitev, Vihra K. Milanova, Radka P. Kaneva   Case-control Study of DISC1 Genetic Variants in Bulgarian Affective Disorder Sample

18   Roman Tashev, Margarita Ivanova   Effects of Losartan Infused into Hippocampal Ca1 Area on Exploratory Behaviour of Rats

19   Mihail Chervenkov, Teodora Ivanova, Dimitrina Kacheva, Tatyana Stoeva   Antiviral Activity of Melissa officinalis Aqueous Extract against Pseudorabies Virus