I. Simeonov 3-4
I. Human and biosphere
H. Angelov, M. Lyubenova 5-10
H. Draganchev, M. Georgiev, B. Mihailov 11-18
M. Dimitrova, R. Nedkov 19-24
A. Sotirov, D. Mawlood, N. Pistalov, R. Vezenkova, M. Yerusalimova, L. Stanchev, T. Rasulski, S. Savova 25-32
N. Nikolov, G. Trapov, M. Mazhdrakov, D. Benov 33-38
V. Ilyn, D. Korshunov 39-44
II. Microorganisms and environment
V. Govorukha, O. Tashyrev 45-54
J. Ivanova, L. Kabaivanova 55-60
A. Tomov, A. Doycheva, G. Satchanska 61-67
V. Vassilev, E. Roumenina 68-75
A. Deleva 75-85
O. Vitov, A. Sotirov 86-93
A. Alexandrov, E Nedkova 94-98
S. Bogdanov 99-104
V. New projects
D. Benov, J. Toshkov, M. Karakolev 105-116
VI. Scientific forums
Thirteenth congress of
A. Galabov, H. Najdenski 117-118
INFLUENCE OF THE
Christo Angelov, Mariyana Lyubenova
Abstract: The problem of the influence of electromagnetic radiation of mobile phones on human health was treated. The existing studies and existing legislation were also analyzed. More research and tests are absolutely necessary to determine not only the limits of radiation from the base stations in their transmission area, but also the restrictive norms and standards for mobile devices and creating hygienic norms and rules for the use and possession of mobile phones of the human population in this area. This will make possible to prevent the occurrence of environmental problems or future environmental catastrophe.
Key words: mobile phones, electromagnetic radiation, human health, environment
EXPERIMENTAL AND THEORETICAL RESEARCH OF NOISE EMITTED BY MERCHANT SHIPS IN THE PORT
Hristo Draganchev, Milcho Georgiev, Boris Mihailov
the level of
noise emitted during the passage of vessels in the rivers
and canals in the
aquatic environment and the impact on settlements near to
ports as required by
the EU hasn’tbeen performed on a local level (in Bulgaria). The
analysis of existing standards
and local legislation shows that there aren't any local
provisions for the
emitted noises from vessels. Directive
2002/49/ÅÑ of the European Parliament and Council of Europe
 defines the
overall approach for avoiding and restricting the harmful
effect of different
global noise sources (not local ones). In this respect,
Directive 2002/49/EC is
not treating individually the ship noise impact to the
environment. Other EU
Directives are covering the ship noise issues, as sources.
2003/44/ÅÑ re. recreational ship crafts, and as well
covering the technical requirements for water crafts).
defines limit values for moving ships in 25 m distance from
ship line, i. e. 75 dB(A), and respectively of
stationary ship – 65 dB(A). As sub-law in
Key Words: Noise emission
in the environment, modeling and
evaluation of noise, noise
REGISTRATION OF FLOODS AND FIRES USING MODIS
M. Dimitrova, R. Nedkov
Abstract. In this paper we present the possibility for identification of floods and fires using spectral reflection characteristics of different objects based on the MODIS data. We present the differences in reflection characteristics of different objects during such events.
Key words: floods, fires, satellite data, MODIS, spectral reflection characteristics
INFLUENCE OF SOME FEEDERS ON CONTAMINATION OF
Anton Sotirov, Dana Mawlood, Nikola Pistalov, Rositsa Vezenkova, Mihaela Yerusalimova, Lachezar Stanchev, Thomas Rasulski, Siana Savova
Abstract. During the
study the following parameters were measured on terrain:
radiation of the water
and the common radiation background; acidity of the water
(pH); water and air
temperature (t, °C); electrical conductivity (EC); total
dissolved sulfur (
environmental monitoring, water contamination,
ACOUSTIC DESIGN USING THE THEORY OF QUASI-CYLINDRICAL SOUND WAVES
Nikolay Nikolov, Georgi Trapov, Metodi Mazhdrakov, Dobriyan Benov
Abstract. In acoustics are considered two models of propagation of sound waves - from a point or line source. In the first case, the noise energy is distributed in the form of a sphere, and in the second - as a cylinder of infinite length.
This finding contradicts the field measurements in urban environments and the results of laboratory experiments. Therefore, in 1984 N. Nikolov defines a new class of sound waves as a quasi-cylindrical. Physically, the quasi-cylindrical sound waves are generated by in phase emitting stacked point sources. Therefore, with limited number of sources, can be expected that the waves have properties similar to spherical, and in any number of sources - of the tubular.
Keywords: quasi-cylindrical sound waves, acoustic design, sound wave propagation
Posttreatment microbial biodegradation of liquid products of various organic substrates in the world and in the conditions of orbital flight
Ilyn V.K., Korshunov D.V.
Abstract. The aim of this study was to test the effectiveness of purification of liquid products of biodegradation of organic substrates using aerobic bacteria and fungi during in microgravity conditions. The study was conducted in 2013 in space flight on the board of Bion-M1 biosatellite and a specialized bioreactor, designed to carry out the fermentation, was used. Methodology for purification of substrates remaining after biodegradation of crop residues (carrots and cabbage) used aerobic mesophilic cultures Pseudomonas esterophilus ECM-1736D, Paracoccus denitrificans VKM B-1324, Achromobacter parvulus ECM-1541D and Stenotrophomonas maltophila VKM B-591 of the Russian Collection of Microorganisms and culture fungi.
Keywords: biodegradation, aerobic bacteria, organic substrates, Bion-M1 satellite
THERMODYNAMIC PROGNOSIS FOR ASSESSING THE ROLE OF Fe(III)-REDUCING BACTERIA IN BIOGEOCHEMICAL CYCLES OF IRON AND CARBON
Vira Govorukha, Oleksandr Tashyrev
Abstract. On the basis of thermodynamic calculations spreading of Fe(III)-reducing bacteria in ecosystems characterized by different complexes of extreme factors was experimentally confirmed. Obtained results indicate on the potential impact of Fe(III)-reducing bacteria to biogeochemical cycles of carbon and energy in natural ecosystems. Thermodynamic prognosis of microbial metabolism regulation can be used to increase the efficiency of biotechnologies of iron extraction from mines and purification of water from iron compounds.
Key words: thermodynamic prognosis, Fe(III)-reducing bacteria, natural ecosystems, biotechnologies.
VARIATION IN LIGHT-TEMPERATURE CONDITIONS AFFECTS PIGMENTS AND EXTRACELLULAR POLYSACCHARIDE PRODUCTION BY RHODELLA RETICULATA
Juliana Ivanova and Lyudmila Kabaivanova
Abstract: Light intensities and different temperatures play crucial roles in affecting pigments and carbohydrates content of the red microalga Rhodella reticulata. The total extracellular polysaccharide increased with increasing the photon flux. Its quantity was 0.25 mg ml-1 at 18°C and 260 μE m−2 s−1 and increased up to 0.40 mg ml-1 at 34°C at 260 μE m−2 s−1 and 0.45 mg ml-1 at the same temperature and 520 μE m−2 s−1 light intensity as an answer to the extreme conditions. At 34°C, at both light intensities, the quantity of the polysaccharide is highest, as a defensive mechanism of the cell. The light and temperature conditions also affect the synthesis of photosynthetic pigments of the alga. Decreased quantity of chlorophyll “a” was established at increasing light intensity. Its content in the temperature optimum 26°C, decreased by 1.8 - fold at 520 μEm−2 s−1 due to photoinhibition. Variation in these parameters could lead to increased production of a desired bioproduct.
Key words: Rhodella reticulata, irradiance, temperature, pigments, exopolysaccharide
Abbreviations: EPS-exopolysaccharide; PBP-phycobiliproteins
ANTIBACTERIAL ACTIVITY OF ORGANICALLY GROWN TOMATOES: JUICE, PUREE, TISSUE AND SEEDS
Alexander Tomov, Anna Doycheva, Galina Satchanska*
Abstract: In this study different organically grown bulgarian tomato varieties – Bull's heart, Rose, Ideal and Sorrentino have been studied in order to evaluate their antibacterial properties against Gram-positive and Gram-negative bacteria. Experiments were conducted via agar diffusion method. 0.1 ml of test microorganisms at concentration 1x109 CFU/mL were spread on Nutrient agar plates. Test strains - the Gram(-) Escherichia coli No 8751 and the Gram(+) Bacillus subtilis No8752 were delivered from the National Bank for Microorganisms and Cell Cultures (NBMCC), Bulgaria. Raw and heat treated tomato puree were loaded in perforated in agar wells while the tissue slices and seeds were placed on the agar surface. Samples were cultivated at 37oC for 24 hours and further the diameter of the sterile zones was measured. Our results revealed that the tomato puree diplays antibacterial activity towards both B. Subtilis and E. coli. The raw tomato puree disposed wider inhibition zones compared to the dried one. Tomato seeds showed inhibitory effect only against B.subtilis and none towards E. coli. The antibacterial activity of tomato tissue slices was similar to those of the seeds. In conclusion, the strongest antibacterial effect was displayed by the raw tomato puree. Among the two varieties “Ideal” showed higher activity. The obtained results demonstrated that bulgarian organically grown tomatoes contain antimicrobial substances and could be used as prospective source of novel antimicrobial agents.
Key words: antibacterial activity, organically grown tomatoes, natural puree, heat treated puree, seeds, tissue
CONDITION ASSESSMENT ON A TEST SITE IN
Vassil S. Vassilev, Eugenia K. Roumenina
Abstract: The purpose of
this article is to investigate the
crop condition based on per-pixel supervised
classification on SPOT-5 HRG
satellite image, acquired on 21.04.2011 for Zhiten test
site situated in
Key words: agriculture, crop identification, accuracy assessment, crop condition assessment
DETECTION OF UNUSUALLY HIGH AEROSOL LOADING OF THE
ATMOSPHERE AND OF EXTRAORDINARY
SEASONAL SAHARAN DUST INCURSIONS OVER
Atanaska D. Deleva
work presents results of LIDAR investigations of the
Key words: lidar, laser remote sensing, Saharan dust, aerosols, troposphere
MINERAL CONTENT OF THE RIVER SANDS IN KYUSTENDIL REGION WITH ECOLOGIGAL RISKS FOR THE QUALITY OF SOILS, WATER AND BUILDING MATERIALS
Oleg Vitov, Anton Sotirov
content of the sands from the rivers in Kyustendil region,
Key words: sands, mineral contents, contaminants, water, soils
IRRADIATION EFFECT ON SURVIVAL AND
DIAMETER GROWTH OF 40 YEARS OLD PROGENY OF NORWAY SPRUCE
Alexander H. Alexandrov, Elena Nedkova
Abstract: In 1973, when a purposeful transfer of definite genes was still not used for forest tree species, an acute irradiation with gamma- rays of cobalt- 60 (⁶⁰Co) was applied on seeds of Picea abies ( L.) Karst. populations from Rila Mt., Pirin Mt., the Rhodopes, the Balkan range and Vitosha Mt. with the purpose of adapting their progenies towards the climate change and the appearance of any diseases and pests. Norway spruce seeds by individuals and stands in full- seed year 1971 were irradiated with doses of 200 rad, 500 rad, 1000 rad, 1500 rad and 7500 rad in March 1973 and were sown in the same year in an experimental field near Govedartsi of Rila mt. at altitude of 1250 m.
The analysis of data on survival and growth in diameter of trees at age 40 show the following results:
The dose of 500 rad causes a stimulation effect with 10 % on survival of 40- years- old spruce trees obtained from irradiated seeds. The positive post- irradiation effect on survival of trees tends to better adaptation.
The dose of 500 rad provokes a depressed effect with 15 mm on growth in diameter of spruce trees in 2013, obtained from irradiated seeds. Nevertheless, the growing stock of this sample plot is slightly bigger by reason of greater part of survived trees.
The post- irradiation effect on survival and growth of Norway spruce is unpredicted but a dose of 500 rad for most individuals and populations has definitely a positive response on survival.
Keywords: post- irradiation effect, Picea abies (L.) Karst., survival, growth.
FROM FERTILIZATION OF SCOT PINE STAND ON BROWN
The paper presents results from fertilization experiment of
scot pine stand
(Pinus sylvestris L.) on
Key words: fertilization, brown forest soils, humus, total nitrogen, phosphorus, potassium, pH, growth, Pinus sylvestris L.
Dobriyan Benov, Josif Toshkov, Mihail Karakolev
Abstract. The experience gained from the design and construction of transport noise barriers is allowing us to make certain recommendations. They can not cover all possible cases, but we believe that it will be useful for practical activities of specialists in this field.
Design of transport noise barriers is a complex engineering task in which solution the effect of factors of different nature - physical processes and phenomena, urban planning and landscape-planning practice, specific regulations for design and construction experience must be taken into account . Derived formulas takes into account the impact of the most significant of these factors. In some cases the decision must comply with the specific situation, by enriching the model.
Keywords: transport noise barriers, acoustic design, practical recommendations