AGROBIOLOGICAL AND TECHNOLOGICAL CHARACTERISTICS OF SOME GRAPEVINE VARIETIES AND CLONES GROWN IN SERBIA

In Serbia under the vineyards is about 22 149 hectares from that area 17482 hectares is under vine and 4667 hectares under table varieties. The most common wine varieties are Cabernet sauvignon (8.49%), Merlo (8.14%), Limberger (4.65%), Pinot noir (3.2%), Prokupac (3.33%), Italian riesling (13.94%), Riesling rhine (8.01%), Chardonnay (6.76%) and Sauvignon blanc (4.59%). Among table varieties Muscat hamburg with 52.83% is the most common, followed by Victoria (7.94%), Moldova (7%), Cardinal (5.92%) and others. Over the past twenty years grapevine assortment has been significantly expanded through: introduction of other varieties and clones (mainly from France and Italy), with creation of new varieties at Faculty of Agriculture University of Belgrade and with clonal selection of Serbian origin varieties. Through big number of breeding programs, 23 table and 9 wine grape varieties were created, while 12 new clones of autochthonous Prokupac variety were recognized by the Genetic Resources Department of the Ministry of agriculture, forestry and water Management

VARIATION OF STRUCTURAL BUNCH AND BERRIES INDICATORS AND PHYSICO-CHEMICAL WINE PROPERTIES OF CABERNET SAUVIGNON CV. UNDER INFLUENCE OF DEFOLIATION AND HARVEST TIME IN AGROECOLOGICAL CONDITIONS OF CENTRAL SERBIA

Defoliation and different harvest time can affect structural composition of bunch and berries. Research was carried out at Cabernet Sauvignon variety in vineyard of King Peter I Karadjordjevic-Royal Winery, Serbia. Defoliation included treatments with 4 and 8 removed leaves and control. The harvest was done at full maturity and 15 days after. Structural cluster indicators in time of full maturity had higher value in treatment with 8 removed leaves. At late harvest the highest values was founded in treatment with 4 removed leaves (epidermis 15.2%, mesocarp 73.8%, seeds 10.9%). By physico-chemical analysis of wines was founded the highest alcohol content in treatment with 8 removed leaves (12.13% v/v). In control was recorded the highest levels of total extract and extract without sugar. Total acid content was higher in treatment with 8 removed leaves. The highest level of total polyphenol level (1.584 g/l) was noted in treatment with 4 removed leaves. In treatment with 8 removed leaves was recorded the highest level of total anthocyanins (0.166 g/l). In term of late harvest most of examined parameters had higher values.In the second experimental year parameters of physico-chemical wine analysis had significantly higher values compared to both harvest terms

NSVS06507557; a low-mass double-lined eclipsing binary

In this paper we present the results of a detailed spectroscopic and photometric analysis of the V=13$^m$.4 low-mass eclipsing binary NSVS 06507557 with an orbital period of 0.515 d. We obtained a series of mid-resolution spectra covering nearly entire orbit of the system. In addition we obtained simultaneous VRI broadband photometry using a small aperture telescope. From these spectroscopic and photometric data we have derived the system's orbital parameters and determined the fundamental stellar parameters of the two components. Our results indicate that NSVS 06507557 consists of a K9 and an M3 pre-main-sequence stars with masses of 0.66$\pm$0.09 \Msun and 0.28$\pm$0.05 \Msun and radii of 0.60$\pm$0.03 and 0.44$\pm$0.02 \Rsun, located at a distance of 111$\pm$9 pc. The radius of the less massive secondary component is larger than that of the zero-age main-sequnce star having the same mass. While the radius of the primary component is in agreement with ZAMS the secondary component appers to be larger by about 35 % with respect to its ZAMS counterpart. Night-to-night intrinsic light variations up to 0$^m$.2 have been observed. In addition, the H$_{\alpha}$, H$_{\beta}$ lines and the forbidden line of [O{\sc i}] are seen in emission. The Li{\sc i} 6708 \AA absorption line is seen in most of the spectra. These features are taken to be the signs of the classic T Tauri stars' characteristics. The parameters we derived are consistent with an age of about 20 Myr according to the stellar evolutionary models. The spectroscopic and photometric results are in agreement with those obtained by theoretical predictions.Comment: 21 pages, 9 figures. Accepted by MNRA

CoRoT photometry and high-resolution spectroscopy of the interacting eclipsing binary AU Mon

Analyses of very accurate CoRoT space photometry, past Johnson V photoelectric photometry and high-resolution \'echelle spectra led to the determination of improved and consistent fundamental stellar properties of both components of AU Mon. We derived new, accurate ephemerides for both the orbital motion (with a period of 11.113d) and the long-term, overall brightness variation (with a period of 416.9d) of this strongly interacting Be + G semi-detached binary. It is shown that this long-term variation must be due to attenuation of the total light by some variable circumbinary material. We derived the binary mass ratio $M_{\rm G}/M_{\rm B}$ = 0.17\p0.03 based on the assumption that the G-type secondary fills its Roche lobe and rotates synchronously. Using this value of the mass ratio as well as the radial velocities of the G-star, we obtained a consistent light curve model and improved estimates of the stellar masses, radii, luminosities and effective temperatures. We demonstrate that the observed lines of the B-type primary may not be of photospheric origin. We also discover rapid and periodic light changes visible in the high-quality residual CoRoT light curves. AU Mon is put into perspective by a comparison with known binaries exhibiting long-term cyclic light changes.Comment: Accepted for publication in MNRA

STRUCTURE AND REPRESENTATION OF AROMATIC COMPOUNDS OF GRAPE BRANDY PRODUCED FROM MUSCAT TABLE GRAPEVINE (VITIS VINIFERA L.) CULTIVARS

A combined gas chromatographic-mass spectrometric (GC/MS) method was used in this study to detect volatile components of eight samples of grape brandy produced from Muscat table grapevine (Vitis vinifera L.) cultivars. The gas chromatographic-mass spectrometric analysis of the extracts resulted in the identification of 155 components including 64 esters, 35 terpenes, 17 acids, 8 alcohols, 3 aldehydes, 8 ketones, 14 hydrocarbons (alkanes, alkenes and alkenols), 5 acetals and 1 heptanoic acid anhydride. Ethyl esters of C8 – C18 fatty acids and terpenic compounds were considerably more abundant in all grape brandy samples as compared to the other volatile compounds identified.Â

Revealing the Hidden Language of Complex Networks

Sophisticated methods for analysing complex networks promise to be of great benefit to almost all scientific disciplines, yet they elude us. In this work, we make fundamental methodological advances to rectify this. We discover that the interaction between a small number of roles, played by nodes in a network, can characterize a network's structure and also provide a clear real-world interpretation. Given this insight, we develop a framework for analysing and comparing networks, which outperforms all existing ones. We demonstrate its strength by uncovering novel relationships between seemingly unrelated networks, such as Facebook, metabolic, and protein structure networks. We also use it to track the dynamics of the world trade network, showing that a country's role of a broker between non-trading countries indicates economic prosperity, whereas peripheral roles are associated with poverty. This result, though intuitive, has escaped all existing frameworks. Finally, our approach translates network topology into everyday language, bringing network analysis closer to domain scientists