Boris
Mihaylov, Milcho Georgiev, Antonia Gadeleva
Abstract. The recent paper
presents in brief the realized from GIS–Sofia
Ltd and Spectri Ltd project for
crating Strategic
Noise Maps for
Sofia Aglomeration (approved in 2010). Bellow
are cited the used methodology and instrumentation. In brief
are shown the overall
final results, and the main conclusions out of them.
Keywords:
noise, noise map
ECOHYDROLOGICAL
ANALYSIS ÎN THE RIVER VACHA BASIN, LIMITED TO TZANKOV KAMAK DAM, USING
GIS ON
THE BASE OF SATELLITE, GPS AND GROUND DATA
Silvia
Kirilova, Roumen Nedkov, Stefan Modev
Abstract:
In the
paper the results from ecohydrological analysis conducted on the base
of
contemporary geoinformation technology are presented. The study and the
analysis are made in GIS platform using satellite, GPS and ground data.
Using
GIS to solve
the tasks of engineering hydrology gives
the possibility/opportunity for a quick
and easy access to data acquisition and analysis in
space
to be used. Thus, the influence of the subjective factor on the
data and
analysis reliability and precision is minimized.
Orohydrographical
characteristics of the researched basin are the
information
base which together with run-off characteristics allow generalization
and
derivation of different regional empirical formulas. These empirical
formulas are
obtained under the analysis and estimations when defining the necessary
parameters for the design of hydrotechnical facilities. The received
empirical
formulas are objective quantity ecological estimitation for further
exploitation of hydrotechnical facilities.
Key
words:
Geographic
Information
System
(GIS),
GPS,
Digital
Elevation
Model (DEM), river
system, run-off
MICROBIAL DEGRADATION OF
PHENOL AND PHENOLIC COMPOUNDS (REVIEW)
Zlatka
Alexieva, Maria Gerginova, Husein Yemendzhiev
Abstract: Microorganisms are an important participant in
the natural chemical
cycles,
but are also
useful in the breakdown of
chemical compounds produced
by human activity. In
the practice of cleaning the environment with microorganisms, most
approved is their use in
treatment plants for degradation
of urban, agricultural or
industrial waste. In
the last 30-40 years
in the environment fall
within various highly
toxic chemicals.
Widespread application of
physico-chemical methods
of destruction are
generally expensive and often lead to additional air pollution. With the
development of biotechnology,
it is clear that disposal of
toxic
pollutants by organic
synthetic methods is
more
cost-effective and environmentally
friendly. Phenol and
its derivatives are
known as highly toxic and widespread pollutants.
The problem of effective
removal from the
environment is directly related to protecting the environment and
human health.
Key
words: phenol,
biodegradation, bacteria, yeast, fungi, mathematical modeling
EFFECT OF RHAMNOLIPID
BIOSURFACTANT ON CELL SURFACE
PROPERTIES OF BACTERIAL STRAINS GROWN ON N-HEXADECANE
Tatyana
Avramova, Maya Atanasova, Anna Sotirova, Danka
Galabova
Abstract.
Effect of biosurfactant
rhamnolipid Ps-17,
external to the studied ecosystem, on microbial cell growth,
permeability and hydrophobicity of bacterial strains, members of a
microbial
consortium, isolated from lubricant-polluted water was studied.
Bacterial
strains were representatives of three genera, Enterococcus;
Staphylococcus; Alcaligenes and
were selected according to their ability to
grow on n-hexadecane
and to produce biosurfactant. It was
shown that biosurfactant-rhamnolipid Ps-17 supported the growth of bacterial isolates on
hexadecane in different degree. The
results revealed that biosurfactant Ps-17 at used concentrations modified
cell hydrophobicity and increased cell permeability of Gram (+) and Gram
(-) isolates. Evaluation of the
relationship between changes in cell surface
permeability and hydrophobicity and the capability of the tested
strains to
utilize the hydrophobic carbon substrate n-hexadecane was made
as well. The results obtained were
discussed
in attempt to elucidate the relationships
between the
members of the consortium and to
evaluate the role of biosurfactants, self-produced or exogenous, in
bioremediation of hydrocarbon-polluted sites.
Keywords: rhamnolipid; cell surface
properties; n- hexadecane; Enterococcus;
Staphylococcus;
Alcaligenes
MODELING
OF SHOCK LOADING WITH PCP-XENOBIOTIC
DURING REAL WASTEWATER TREATMENT PROCESS
Abstract. The twelve hour shock loading with PCP (20 mg/l) of modelled process of wastewater treatment in laboratory equipment, similar to the real water treatment in
Key words: modeling, real water treatment, pentachlorophenol, biodegradation
INVESTIGATIONS AND
SELECTION OF SACCHAROMYCES CEREVISIAE STRAINS
FOR BIO-ETHANOL MANUFACTURING
Silvia Mileva, Kantcho Lahtchev
Abstract.
Eight strains of the
yeast Saccharomyces cerevisiae were tested for their ability to produce ethanol under
the stress conditions of elevated temperature of 370C and
high
amounts of glucose. Several criteria (dynamics
of released CO2, amounts of ethanol generated,
cell growth, amounts of residual sugars and productivity) were used for
estimation of the strain performance. The results obtained revealed a group of four
strains (∑1278b, RD-01, ¹4 è ¹27)
that are resistant to the fermentation conditions employed and are
perspective
for further works aiming genetic improvement of their abilities.
Key words: bioethanol,
alcohol fermentation, yeasts, Saccharomyces cerevisiae
TISSUE-BASED BIOSENSOR WITH INHIBITION FOR
DETERMINATION OF ALDICARB
Antonia Pandelova, Nikolay
Stoyanov, Tzvetomira Romanska
Abstract: In the present work biosensor
system for
determination of aldicarb is described. The biosensor transducer used
as
biological material plant tissue of potato Solanum
tuberosum. The principle of measurements is based on inhibition of
enzyme
polyphenol oxidase by carbamatic acid type pesticide aldikarb. As basic
substrate catechol is used. The
experimental researches are carried out in three buffer solutions –
distiller
water, 0.025M phosphate buffer and 0.1M phosphate buffer. The best
linear
relationship between concentration of inhibitor and output signal is
observed
in 0.025M phosphate buffer. The experimental results of analytical
characteristic of biosensor with different enzyme loading are given.
Key words: biosensor, potato tissue,
aldicarb, inhibition
CLIMATICAL
CONDITIONS AND VEGETATION SUCCESSIONS IN FORESTS OF “PARANGALITZA”
RESERVE IN
RILA Mts
Nadezhda Stoyanova
Abstract. In the paper have been analyzed original data for the regeneration proceses in the
“Parangalitza”
reserve in Rila mountain and a climate data. The major part of the
vegetation
is primary vegetation and it is represented mainly by formation of Picea abies (L.) Karsten and formation
of Abies alba Mill.; formation of Pinus
silvestris L.and formation of Fagus sylvatica L.
have lower frequency
of occurrence. There are a different-aged regeneration structures of
undergrowth
established. The structure and species composition of undergrowth was
determined in Picea abies ecosystems
with some admixture of Abies alba and
Fagus silvatica, and also in Pinus
sylvestris ecosystems with some
admixture of Picea abies. Based on
the analysed results, a trend of vegetation succession was established.
Key words: