Rotation of the Mass Donors in High-mass X-ray Binaries and Symbiotic Stars

Our aim is to investigate the tidal interaction in High-mass X-ray Binaries and Symbiotic stars in order to determine in which objects the rotation of the mass donors is synchronized or pseudosynchronized with the orbital motion of the compact companion. We find that the Be/X-ray binaries are not synchronized and the orbital periods of the systems are greater than the rotational periods of the mass donors. The giant and supergiant High-mass X-ray binaries and symbiotic stars are close to synchronization. We compare the rotation of mass donors in symbiotics with the projected rotational velocities of field giants and find that the M giants in S-type symbiotics rotate on average 1.5 times faster than the field M giants. We find that the projected rotational velocity of the red giant in symbiotic star MWC 560 is v sin i = 8.2 +/- 1.5 km/s, and estimate its rotational period to be Prot = 144 - 306 days. Using the theoretical predictions of tidal interaction and pseudosynchronization, we estimate the orbital eccentricity e = 0.68 - 0.82.Comment: Proceedings of the conference "The Golden Age of Cataclysmic Variables and Related Objects II", Palermo, 9-14 September 2013. To be published in Acta Polytechnica. 4 pages, 1 figur

Electronic business management in reengineering

The global development of the information technologies placed new challenges inform the business organizations. In the dynamically developing conditions of continuous scientific and technical progress they are defining the directions of business conduction. In the virtual space most of them are related to business processes management on the grounds of information exchange. In the corporate practice this approach finds increasing application and defines the conceptive basis of the so called electronic business. In particular its purpose is brought to the best utilization of the possibilities to integrate the modern technologies in the business. From this point of view it includes a number of activities and procedures for optimization of the business processes in and out of the organization. Established on the grounds of the correspondent information and communication relations, the electronic business is a major factor for designing the information net through which the relations with the customers, suppliers, personnel and the associates could be refined. In this sense the purpose of the present report is related to identifying the prerequisites for the application of the electronic business in reengineering conditions

Urea rebound - some disadvantages of urea kinetic modeling

PURPOSE: The objectives of the present study are to determine the average urea rebound by examining the urea concentrations immediately after completion of hemodialysis (HD) and comparing these results to urea concentrations taken 30 min after the procedure (equilibrated values), to assess how the delivered dialysis dose changes when URR and Kt/V are calculated using each of these two values and to evaluate the significance of these differences and the reliability of the indicators in use.MATERIAL AND METHODS: The study covered 30 end-stage renal failure (ESRF) patients, 16 males and 14 females on chronic HD at a mean age of 43.90±10.63 years and average duration of dialysis treatment of 6.90±3.75 years. Average urea values were calculated for each patient using data from three consecutive monthly examinations taken immediately and 30 min after HD in order to determine the mean urea rebound percentage.RESULTS: Mean urea values in samples taken immediately and 30 min after HD showed statistically significant differences (p<0.05). Equilibrating urea concentration led to an average increase of 17.7% at the 30 min after HD. There was a statistically significant difference (p<0.05) between the calculated single pool Kt/V (1.23±0.11) and equilibrated Kt/V (1.17±0.18) as well as concerning mean URR values calculated by using non-equilibrated and equilibrated post dialysis urea (65.3±1.18% and 6.67±2.4%, respectively).CONCLUSION: Calculation of URR and single pool model of Kt/V for assessment of dialysis adequacy in ESRF patients on chronic HD results in overestimation of the delivered dialysis dose. These values differ statistically significantly from those when accounting for urea rebound. URR and Kt/Vsp indicators do not possess the necessary reliability as means to evaluate the delivered dialysis dose.Scripta Scientifica Medica 2013; 45(1): 71-74

Role of therapeutic plasma exchange in the complex treatment of severe kidney diseases

PURPOSE: The strongest effect of therapeutic plasma exchange (TPE) is achieved in diseases with immune and autoimmune genesis, hyperviscous conditions and intoxications of various origins. The aims of the study were to assess the long-term effect of TPE in the complex therapy of severe renal diseases and to highlight therapeutic strategies necessary to achieve good clinical results.MATERIAL AND METHODS: During the period 1980-2010, TPE was carried out in the form of a complex treatment of 87 patients with immune nephropathies and 44 patients with malignant myeloma. The primary diseases were the following: chronic glomerulonephritis - 42, lupus nephropathy - 31, Henoch-Schonlein nephritis - 8, Wegener granulomatosis ± four and Goodpasture syndrome - two patients. The diagnosis was confirmed after a puncture kidney biopsy in 72 (82.8%) patients with immune nephropathies. TPE was performed using centrifugal or filtration methods.RESULTS: The patients with immune nephropathies underwent between 5 and 7 consecutive plasma exchanges daily or every two days. A three consecutive days of corticosteroid pulse therapy was initiated after last procedure followed by conventional immunosuppressive therapy. After serial TPE a significant decrease in anti-GMB antibodies and circulating immune complexes was detected. Continuous clinical and paraclinical remission was achieved in 62.7% of the patients who received the combined treatment.CONCLUSION: TPE has a beneficial effect after being included in the complex treatment of patients with severe immune nephropathies. The immunomodulation contributes to the successful management of severe ongoing autoimmune processes. In patients with hyperviscosity, `supporting` TPE every 2 or 3 months is required to lower the increased viscosity, to prevent thromboembolic complications, and to slow-down nephropathy progression.Scripta Scientifica Medica 2013; 45(1): 66-70

Study of Hemodialysis Patients` Compliance for the Performed Treatment. Do the Patients Adhere to Physician`s Guidelines?

The patients with chronic renal failure (CRF) on chronic haemodialysis (CHD) should strictly adhere to the prescribed therapeutic regimens and physician`s guidelines. Otherwise the results from this long-lasting treatment are often unfavourable. The aim of the present study was to reveal the opinion of CRF patients on CHD about their attitude towards their continuous treatment. Forty patients, 21 males and 19 females, at the mean age of 50,48±14,90 years and a mean duration of CHD of 5,82±4,11 years were examined. They filled-in anonymous questionnaire containing 26 items devoted to their observation of the necessary therapeutic and dietary regimens. The longer CHD duration influenced negatively on patient`s compliance. However, such patients tended to observe more strictly the time for haemodialysis prescribed by the physician. Patient`s compliance depended on the educational level, too. Therefore, an extraordinarily important physician`s task was the provision to the patients of adequate information about their disease and its treatment

Symbiotic star T CrB as an extreme SU UMa type dwarf nova

T CrB is a symbiotic recurrent nova that exhibits quiescent and active phases between its classical nova eruptions. The statistical properties of these active phases have been poorly studied thus far. Because of that their nature remained unknown. Here we study statistical properties of the active phases and show that they are consistent with outburst and superoutbursts observed in SU UMa type dwarf novae. The recurrence time of these outbursts is consistent with theoretical predictions for similar systems. Moreover, the visual and X-ray evolution of the last active phase is consistent with a superoutburst. This suggests that T CrB is a dwarf nova with an extremely long orbital period, closely related to SU UMa dwarf novae. The similarities between the last superoutburst and the reported activity preceding the 1946 nova eruption may suggest that next classical nova eruption in T CrB could be indeed soon expected.Comment: 7 pages, 4 figures, accepted to ApJ

The trophic plasticity of genus phelipanche pomel (orobanchaceae) in bulgaria

New data about the natural parasitism of Phelipanche ramosa (L) Pomel, P. mutelii (Shultz) Pomel, P. oxyloba, P. arenaria and P. purpurea in Bulgaria are collected. The information for the hosts describes 46 new trophic systems with species from the families: Brassicaceae, Solanaceae, Fabaceae, Asteraceae, Apiaceae, Poaceae, Lamiaceae, Scrophulariaceae, Chenopodiaceae, Caryophyllaceae, Araliaceae, Euphorbiaceae, Geraniaceae, Dioscoreaceae and Verbenaceae. The samples are collected outside the crop fields, far from the known host crops, from different parts of the country. Some of the registered hosts are new for Bulgaria. The voucher specimens with physical connection to the hosts are deposited in the Herbarium of The Agricultural University - Plovdiv (SOA). The collected data suggest that genus Phelipanche is represented by two trophic groups according to the known sections. Sect. Phelipanche unites the polyphags P. ramosa, P. oxyloba and P. mutelii. Sect. Arenariae consist oligophags - P. arenaria and P. purpurea

Crocus adamioides (Iridaceae) in the Bulgarian flora

Crocus adamioides Kernd. et Pasche, as it is currently known, was originally treated as C. biflorus Mill. subsp. adamii B. Mathew in the flora of Bulgaria by Mathew (1982) and verified by Rukšāns (2017). The taxon was afterwards described as a separate species (Kerndorff et al. 2012), the holotype being collected in Kırklareli Province, European Turkey. The species was for the first time mapped in two floristic regions of Bulgaria. The diagnostic characters based on the general morphology and leaf anatomy were defined from the natural populations of the species and compared to the type specimen and relevant data from the literature. The phylogenetic position of the species was clarified by sequencing of the internal transcribed spacer region (ITS: ITS1 + 5.SsrDNA + ITS2) and comparison of the obtained sequence with those annotated in NCBI. A phylogenetic tree was built using Bayesian phylogeny. Results have shown the highest degree of phylogenetic similarity with C. adamioides from Turkey. The closest relative C. ranjeloviciorum Kernd., Pasche, Harpke et Raca remains in the proximity. Our morphological, anatomical and molecular analyses have revealed that the Bulgarian population shows a peculiar combination of characters specific to C. adamioides

EVALUATION OF THREE SPECIES FROM PYROLACEAE FAMILY USING ISSR MARKERS

The family Pyrolaceae is represented in Bulgaria by six species, belonging to three genera. The viewpoints for the taxonomical position of the species in this family are not clearly unilateral. The aim of this study is to find molecular markers, allowing the objectively differentiation of the genera in this family, without use of morphological characters. Three species of the family were examined, representing the tree genera distributed in Bulgaria: Moneses uniflora (L.) A.Gray, Orthilia secunda (L.) House and Pyrola minor L. DNA was isolated from leafs and amplified via PCR reactions using 4 primers. The results were processed using cluster analysis and non-metric multidimensional scalling. The consequent cladogram, obtained by the mean euclidean distances, displayed grouping of the samples by genera, independently of their locality. The independent multitudes confirm the accuracy of the method for determination of the species in Pyrolaceae