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Influence of Vegetation on the Avifauna in Two Urban Parks in Plovdiv, Bulgaria
Yanitsa Petrova,Atanas Irikov
Ecologia Balkanica , 2012,
Abstract: This study is related to the investigation of the impact that vegetation caused on the avifauna of the parks “Lauta” and “Tsar Simeon Garden” located in the city of Plovdiv, Bulgaria. As a result of the study, we found that the biodiversity of the vegetation in park “Tsar Simeon Garden” is highly significant in comparison with the same in park “Lauta”. In the park “Tsar Simeon Garden” introduced plant species dominate over indigenous species, as compared with the park “Lauta”. The differences in the vegetation are caused by different management approaches carried out in the both parks. The degree of similarity between trees and bushes in both parks is low. The vegetation also had a significant influence on the avifauna living within the parks. The avian biodiversity in park “Lauta” is two times higher in comparison with the avian biodiversity in park “Tsar Simeon Garden”. The degree of similarity in the avifauna between both parks is significant, due the fact that all of the species, except one documented in “Tsar Simeon Garden” being documented in park “Lauta” as well. Eighteen new species of birds were recorded and described for the first time in the city of Plovdiv. The conservation status of the avifauna in park “Lauta” is quite significant in comparison with the same in park “Tsar Simeon Garden”.
Method for Tentative Evaluation of Membrane Permeability Coefficients for Sodium and Potassium Ions in Unicellular Organisms  [PDF]
Atanas Todorov Atanasov
Open Journal of Biophysics (OJBIPHY) , 2013, DOI: 10.4236/ojbiphy.2013.31A012
Abstract:

The membrane permeability coefficient for sodium and potassium ions in unicellular organisms can be calculated using the data for cell volume, surface and mean generation time during growth and dividing of cells by binary. Accordingly theory of proposed method, the membrane permeability coefficients for passed trough outer cell membrane sodium and potassium ions, is equal to the volume of unicellular organism divided to product between cell surface and mean generation time of cells. The calculated by this way diapason of values overlaps with experimentally measured diapason of values of permeability coefficient for sodium and potassium ions. The deviation between the theoretically calculated and experimentally measured values of permeability coefficient does not exceed one order of magnitude.

Length of Periods in the Nasal Cycle during 24-Hours Registration  [PDF]
Atanas Todorov Atanasov
Open Journal of Biophysics (OJBIPHY) , 2014, DOI: 10.4236/ojbiphy.2014.43010
Abstract:
The periodic congestion and decongestion of the nasal venous sinuses and an alternation of airflow from one side of the nose to the other are known in literature as “nasal cycle”. It is established that nasal cycle during 24-hours registration contains from 4 to 8 time full periods, length of which varies from 0.80 h to 5.75 h. The mean length of all full periods is 2.80 ± 0.17 h. The mean length of full periods of left nostril is 3.07 h and the mean length of periods of right nostril is 2.43 h. The result suggests that there is any asymmetry in length of periods of airflow trough left and right nostrils about 40 min. The longer periods of left nostril can be connected with higher metabolic and functional activity of brain and human organism during active work.
Diagnostic Strategies and Treatment for Ewing’s Sarcoma  [PDF]
Roumiana Todorova, Atanas T. Atanasov
International Journal of Clinical Medicine (IJCM) , 2012, DOI: 10.4236/ijcm.2012.36097
Abstract: Ewing’s sarcoma is an enigmatic malignancy of progenitor cell origin, driven by transcription factor oncogenic fusions. About 85% of ESFT cases harbor the t(11;22) translocation and express the fusion protein EWS-FLI. Both bone marrow-derived human Mesenchymal stem cells and Neural crest stem cells are permissive for EWS-FLI1 expression that initiates transition to ESFT-like cellular phenotype. Diagnosis of Ewing’s tumor is based on pathologic and molecular findings. The hypoxia enhances the malignancy of ESFT invasive capacity. An ALDHhigh subpopulation of Ewing’s sarcoma cells, capable of self-renewal, tumor initiation and resistant to chemotherapy in vitro, are not resistant to YK-4-279. Intensive high-dose chemotherapy followed by stem-cell reconstitution was used for ESFT patients in second remission. Plerixafor in combination with G-CSF is an effective enhance stem cell mobilization regimen for stem cell collection with lowest success rate in patients with neuroblastoma. The ESFT-derived antigens EZH2(666) and CHM1(319) are suitable targets for protective allo-restricted human CD8(+) T-cell responses against non-immunogenic ESFT. Primitive neuroectodermal features and MSC origin are both compatible with G(D2) aberrant expression and explore G(D2) immune targeting in ESFT.
Effects of Varying Doses of Plain Bupivacaine with Fentanyl in Patients Undergoing Cesarean Section: Haemodinamics and Neonatal Outcome
Atanas Sivevski
Macedonian Journal of Medical Sciences , 2009, DOI: 10.3889/MJMS.1857-5773.2009.0076
Abstract: Aim. The purpose of this study was to evaluate a three different regimes of spinal anaesthesia for caesarean delivery as well the incidence and severity of maternal hypotension and its influence over neonatal outcome. Material and Methods. Sixty (60) term healthy (ASA I) parturients scheduled for elective or non-elective caesarean delivery without fetal distress under spinal anaesthesia were randomly divided in three groups: group SA F10 (n = 20) received plain bupivacaine 12 mg plus 10 μg fentanyl, group SA F20 (n = 20) received 11 mg plus 20 μg fentanyl and SA LD group (low dose, n = 20) received 8 mg bupivacaine plus 20 μg fentanil. Ephedrine 5-10 mg i.v. bolus was given when systolic blood pressure (SBP) was < 95 mmHg. Maternal blood pressures, efedrin dosage, sensory level of anaesthesia, Apgar scores and neonatal umbilical cord blood acid-base (Ua) status were evaluated. Results. Spinal block provided surgical anaesthesia in all patients. Peak sensory level was higher in the greatest bupivacaine group (4.9 ± 1.33, 5.0 ± 1.21 vs. 5.4 ± 1.55). Parturient who received 12 mg bupivacaine (SA F10 group) develop significantly decrease of SBP - 97.9 ± 8.9 mmHg (23.8%), after spinal blockade compared with low dose group SA LD - 125.0 ± 12.9, (6.0%, p<0.05) and 115.1 mmHg (17.5%) in the SA F20 group. The total amount of ephedrine to treat hypotension was significantly lower in the low dose group (SA LD) compared with two other group (1.75 ± 1.0 mg vs. 13.75 ± 6.5 mg (SA F10) and 11.75 ± 6.2 (SA F20, p<0.5). Neonatal Ua pH was significantly lower with SA F10 group than low dose spinal group-SA LD (7.22 ± 0.07 vs. 7.27 ± 0.04, p < 0.05; 7.23 ± 0.04 SA F20 group). Conclusion. spinal anaesthesia for caesarean delivery with a low dose bupivacaine of 8 mg in conjunction with 20 μg fentanyl leads to less hypotension and ephedrine requirements with better neonatal outcome when compared with 12 and 11 mg bupivacaine - fentanyl spinal anaesthesia.
Effects of Varying Doses of Plain Bupivacaine with Fentanyl in Patients Undergoing Cesarean Section: Haemodinamics and Neonatal Outcome
Atanas Sivevski
Macedonian Journal of Medical Sciences , 2009,
Abstract: Aim. The purpose of this study was to evaluate a three different regimes of spinal anaesthesia for caesarean delivery as well the incidence and severity of maternal hypotension and its influence over neonatal outcome. Material and Methods. Sixty (60) term healthy (ASA I) parturients scheduled for elective or non-elective caesarean delivery without fetal distress under spinal anaesthesia were randomly divided in three groups: group SA F10 (n = 20) received plain bupivacaine 12 mg plus 10 μg fentanyl, group SA F20 (n = 20) received 11 mg plus 20 μg fentanyl and SA LD group (low dose, n = 20 ) received 8 mg bupivacaine plus 20 μg fentanil. Ephedrine 5-10 mg i.v. bolus was given when systolic blood pressure (SBP) was < 95 mmHg. Maternal blood pressures, efedrin dosage, sensory level of anaesthesia, Apgar scores and neonatal umbilical cord blood acid-base (Ua) status were evaluated. Results. Spinal block provided surgical anaesthesia in all patients. Peak sensory level was higher in the greatest bupivacaine group (4.9 ± 1.33, 5.0 ±1.21 vs. 5.4 ±1.55). Parturient who received 12 mg bupivacaine (SA F10 group) develop significantly decrease of SBP - 97.9 ± 8.9 mmHg (23.8%), after spinal blockade compared with low dose group SA LD - 125.0 ± 12.9, (6.0 %, p< 0.05) and 115.1 mmHg (17.5%) in the SA F20 group. The total amount of ephedrine to treat hypotension was significantly lower in the low dose group (SA LD) compared with two other group (1.75 ± 1.0 mg vs. 13.75 ± 6.5 mg (SA F10) and 11.75 ± 6.2 (SA F20, p<0.5). Neonatal Ua pH was significantly lower with SA F10 group than low dose spinal group-SA LD (7.22 ± 0.07 vs. 7.27 ± 0.04, p < 0.05; 7.23 ± 0.04 SA F20 group). Conclusion. Spinal anaesthesia for caesarean delivery with a low dose bupivacaine of 8 mg in conjunction with 20 μg fentanyl leads to less hypotension and ephedrine requirements with better neonatal outcome when compared with 12 and 11 mg bupivacaine – fentanyl spinal anaesthesia.
SEROLOGICAL SURVEY FOR BRUCELLA OVIS DISSEMINATION AMONG GOATS (Capra aegagrus hircus)
Atanas ARNAUDOV
Journal of Central European Agriculture , 2012, DOI: 10.5513/jcea01/13.1.1033
Abstract: By complement fixation test 230 blood samples from goats and he goats were examined for presence of antibodies against Brucella ovis. 134 blood samples were from goats (23 of them were from slipping goats) and 96- from he goats. The animals come from private farms in the Plovdiv and Pazardzhik regions (Southern Bulgaria). 10.87% of all tested blood samples contain antibodies against Brucella ovis. Differences in the percentage of the positive reagents of different goat categories were found. The highest percentage was among slipping goats (39.13% towards to 11.71% among the healthy goats and 3.13% among he goats). It can be concluded that goats play an important role in the epidemiology of the disease. The greatest risk is slipping goats bred together with sheep flocks.
INFLUENCE OF HATCHING EGGS STORAGE PERIOD UPON THE INCUBATION PARAMETERS IN JAPANESE QUAILS
Atanas GENCHEV
Journal of Central European Agriculture , 2009,
Abstract: The purpose of the present study was to establish the effect of the prolonged storage of Japanese quail hatching eggs upon the incubation performance and the quality of hatched quail chicks. The duration of egg storage prior to their incubation had a weak negative effect on the weight loss from incubation day 0 to day 15. Eggs stored for 1-3 days exhibited a statistically signifi cantly higher weight loss than eggs stored for 8-11 days prior to incubation (P<0.001). Eggs stored for up to 8 days showed a tendency towards statistically signifi cant (P<0.05) longer period of incubation. The relationship between incubation period length and egg storage term was moderate, curvilinear and the effect of egg storage term was estimated at 14.3% оf the total dispersion of the trait. Despite the egg storage term prior to incubation, quails with high relative weight had a statistically signifi cant shorter period of incubation. The analysis of the combined effects of egg storage term and relative weight at hatching on incubation length showed that both factors complemented each other and even enhanced their effects upon the determination of the studied trait. The strength of these factors’ effects was estimated at 13.1% of the total dispersion of the incubation period length (P<0.001), with a leading role of the factor relative weight of hatched quail chicks.
Town-Planning in Bulgaria. The State, Problems and the Forecast of Development of the Regional Planning, Town Planning and Architecture in Bulgaria in the beginning of the XXI Century Градостроительство в Болгарии. Состояние, проблемы и прогнозы развития районной планировки, градостроительства и архитектуры в Болгарии в начале ХХI века
Atanas Kovachev
Project Baikal , 2012,
Abstract:
Topical Issues of Landscaping in Big Cities of Bulgaria. Varna Master Plan Case Study Актуальные проблемы озеленения территорий крупных городов Болгарии. На примере нового генерального плана Варны
Atanas Kovachev
Project Baikal , 2011,
Abstract:
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