HPLC Screening of Bioactives Compounds and Antioxidant Capacity of Different Hypericum Species

2018 ◽  
Vol 69 (2) ◽  
pp. 305-309 ◽  
Author(s):  
Daniela Gitea ◽  
Simona Vicas ◽  
Manuel Alexandru Gitea ◽  
Sebastian Nemeth ◽  
Delia Mirela Tit ◽  
...  

Our study compares the content in polyphenolic compounds and hypericin, in four species of Hypericum - H. perforatum L., H. maculatum Cr., H. hirsutum L., H. tetrapterum Fr. (syn. Hypericumacutum Mnch.) harvested from spontaneous flora in the north-western area of Transylvania, Romania. These species represent an important source of such compounds with different biological actions. After making the extracts, they were subjected to HPLC-SM analysis. The presence of rutoside in the largest amount (462.82 mg %) in the H. perforatum extract was observed, this containing most of the flavonoid heterosides. For the species H. maculatum, the presence in a much higher amount of the hyperoside (976.36 mg %) is characteristic compared to the other species. Quercetol is the best represented of the flavonoid aglycons, its concentration being the highest in H. hirsutum (659.66 mg %). The hypericin content ranges from 0.2171 g % in the H. tetrapterum extract, to 0.0314 g % in the methanol extract of H. maculatum.The highest antioxidant properties measured by FRAP method were recorded in the case of H. perforatum and H. maculatum.

Starinar ◽  
2015 ◽  
pp. 197-220
Author(s):  
Nadezda Gavrilovic-Vitas ◽  
Bojan Popovic

During June and July 2014, at the site of Zadruzni Dom in Skelani, archaeological investigations of the late antique building were carried out, whose rooms were first discovered in the course of archaeological excavations in 2008. The building has a rectangular base, of a northeast-southwest orientation, with the discovered part measuring 20.90 x 30.90 m. What is distinguishable within the asymmetrical base is an entrance, along with eleven rooms, two of which have apses, and a peristyle, i.e. an inner courtyard with a roofed corridor surrounding it which connects all the rooms of the building. During the archaeological excavations, entrance thresholds and extremely well preserved mortar floors with mortar skirting were noted in most rooms, along with traces of fresco painting on the walls and mosaic floors, executed in the opus tesselatum technique, observed in several rooms, the peristyle and the encompassing corridor. The discovered mosaic fragments are decorated with geometric motifs in the form of a swastika, a Solomon?s knot, a square, a rhomboid, overlapping circles, etc. and floral motifs of ivy and petals, as well as a double braid motif. Small but, unfortunately, fragmented pieces of a mosaic with a figural representation were discovered in the central part of the peristyle, while the mosaic in room K was decorated with a motif portraying the winged head of Medusa. Two construction phases were noted, an older and a younger, with the walls, which were two Roman feet wide and built from dressed stone, and the older mortar floor belonging to the older construction phase, and the second, younger construction phase comprising mosaics, fresco painting, the younger mortar floor and two furnaces. Contemplating the planimetry of the building, one gets the impression of the rooms being divided between two parts - public and private, whereby the public part of the building would be located near the main entrance hall and would comprise rooms A, B, C, D and F, with mortar floors and traces of fresco painting on the walls. The other, possibly private, part of the building would include five rooms G, H, I, J and K and the inner courtyard. Rooms I, J and K had floor and wall heating, while rooms G and H had an arched apse and possibly functioned as a reception hall and/or a stibadium. The hallway with mosaics, which flanks the inner courtyard, was most likely roofed. Traces of burning in the north-western corridor testify to the destruction of the building in a fire. Based on the architectural elements and the traces of fresco painting and mosaics in the building at the site of Zadruzni Dom in Skelani, it can be deduced that this is a late antique building which can roughly be dated to the period between the end of the 3rd and the mid-4th century AD, and whose lavish decoration implies that it was owned by an affluent resident of Skelani from the aforementioned period.


2015 ◽  
Vol 36 ◽  
pp. 51-59
Author(s):  
Вера [Vera] Астрэйка [Astrėĭka]

The Baltic elements in the grammar of traditional local dialects of north-western BelarusThe article analyzes a number of grammatical features typical for the North-West dialect zone of the Belarusian language. These peculiarities are interpreted as a possible result of Slavic-Baltic contacts in the region. Some phenomena can be explained as a Baltic (mainly (great)Lithuanian) substratum in North-West Belarusian dialects.The factor of areal neighborhood has to be taken into consideration too. Such phenomenon as language support has effect just in connection with the last one. A lot of the appropriate lingual facts are in restricted and inconsistent use. However, it is possible to be said about more or less significant (now or/and before) tendencies of regional lingual development. These tendencies has not got the status of a structural (= constitutional) lingual regularity. As a rule the wide and compact areas are characterized of some lingual facts (= lexemes), which illustrate the given transformations in the system of Belarusian dialects. Baltic influence upon the North-West Belarusian dialects grammar is detected on as the formal level so the structural one. And it is not noticeable at all times. The definite changes in the sphere of morphology and syntax can provoke different modifications in the other parts of a language system (word building, semantics). The results of this process are the evidences of ethnic and language assimilation of native Balts by Slavs in the region. That comes in support of forming the singular North-West Belarusian regiolect (= the regionally marked variety of a dialect language). Балтийские грамматические элементы в говорах северо-западной БеларусиВ статье анализируется ряд грамматических черт, характерных для говоров северо-западной диалектной зоны беларусского языка. Эти особенности квалифицируются автором как весьма вероятное следствие славяно-балтского языкового взаимодействия в соответствующем регионе. Отдельные явления есть основания рассматривать в качестве возможного проявления балтского (главным образом (пра-) литовского) субстрата в северо-западных беларусских говорах. Фактор ареальной смежности здесь также должен быть принят во внимание. В связи с последним следует упомянуть и действие феномена языковой поддержки. Многие соответствующие языковые факты имеют существенные ограничения в употреблении, в говорах выступают не всегда последовательно и регулярно. В некоторых случаях, однако, можно говорить о действии более или менее выраженных (в настоящем и/или прошлом) тенденций регионального языкового развития, которые пока не приобрели статус структурно значимой (= конститутивной) языковой закономерности. Широкие и компактные ареалы образуют, как правило, лишь отдельные языковые факты (= лексемы), иллюстрирующие данные трансформации в системе традиционных беларусских говоров. Балтское влияние на грамматический строй беларусских говоров северо-западной диалектной зоны выявляется как в плане формального выражения, так и на внутриструктурном уровне. Оно не всегда может быть заметно на первый взгляд. Определенные сдвиги в сфере морфологии и синтаксиса могут повлечь за собой изменения в других областях языковой системы (словообразовании, семантике). Результаты этого процесса являются ярким свидетельством того, что на отмеченной территории действительно имела место этноязыковая ассимиляция неславянского (= балтского) населения и происхо- дило формирование своеобразного северо-западного беларусского региолекта (= регионально обусловленной разновидности диалектной речи).


1990 ◽  
Vol 14 ◽  
pp. 342 ◽  
Author(s):  
Stig Jonsson ◽  
Per Holmlund

Scharffenbergbotnen is a 3 × 6 km large basin of interior ice drainage on the north-western side of Heimefrontfjella in Dronning Maud Land, Antarctica. The elevation at the bottom of the depression is 1142 m a.s.l., while bedrock immediately to the south-east of this point rises to more than 2750 m. Ice enters the basin mainly from a low ice divide (1250 m a.s.l.) in the west but also through a 400 m high icefall in the east. Two separate blue-ice areas constitute approximately half the surface of the basin, while the other half is snow-covered. As part of SWEDARP (Swedish Antarctic Research Programme) 1988 a research project to study the origin and mass balance of this basin has been initiated. A net of 28 stakes has been established for studies of ablation and ice movement (Fig. 1). The ice thickness was measured by radio-echo sounding (Fig. 2) and particular care was devoted to get the correct ice depths at the entrance to the basin. The ice thickness along a central section of the basin varied from 1000 m in the west to 400 m at the bottom of the depression. In order to explain the ablation two automatic weather stations (Aanderaa 2700) were operated during the field season (mid-January to mid-February 1988). One was placed in the bottom of the depression, the other 13 km to the west in an area where a small net accumulation took place during the field season. The latter station should record “normal” weather. Sensors registering wind speed, wind gust, wind direction, incoming solar radiation, air temperature and relative humidity were installed at both weather stations, while reflected solar radiation, net radiation and air pressure were measured only at Scharffenbergbotnen. All sensors except the air pressure sensor were placed 270 cm above the ground, and all were read every 10 minutes. Ablation measurements were carried out between 16 January and 18 February on 24 of the stakes. 12 of these stakes were standing in snow. All but one recorded ablation and, as no signs of melting could be seen, all ablation must be due to evaporation and perhaps for the snowy areas some wind erosion. The average ablation rate for the whole field season was 0.7 mm w.eq. per day with a standard deviation of 0.3. Stakes in blue ice showed slightly higher values than those in snow. For January, when air temperatures always were above −10°C, the average ablation rate was 1.2 mm w.eq. per day. A regional difference in ablation rate across the depression was also measurable. Maximum ablation took place immediately below the arête forming the north-eastern boundary of the basin and diminished towards south-west. Below the arête the ablation rate was above 1 mm w.eq. per day for the whole field season and more than 2 mm w.eq. per day during January. A comparison of weather data between the two stations showed the following main differences. In the depression the temperature showed no daily variation and relative humidity varied between 40 and 60%. The weather at the other station was characterised by colder nights and weaker winds as well as by a relative humidity between 60 and 80%. The reason for the regional variation in ablation can be explained by almost constant easterly winds during January and the drop in altitude (between 300 and 500 m) along the north-western arête. On 11 February 1988 the weather station at Scharffenbergbotnen was converted into a system for satellite (Argos) transmission of weather data to Europe. The transmission seems to have been successful but the data are not yet processed. At present (January 1989) one of us is remeasuring the stakes (ablation and ice movement) during SWEDARP 1989. Preliminary results sent by radio point towards a yearly net ablation rate of 120 mm w.eq. for the blue-ice area in the bottom of the depression. 25% of the ablation took place during the field season 1988, but 75% has evaporated between 18 February 1988 and mid-January 1989. Probably most of the evaporation took place during December 1988 and January 1989, which means a very high daily evaporation rate (2.5 mm w.eq. per day).


2017 ◽  
pp. 85-127
Author(s):  
Sashka Georgieva

Abstract: The article deals with marital agreements that had a bearing on Bulgarian-Serbian foreign policy relations between the 1280s and the beginning of the 1320s. There are five such agreements. Three are connected with the Bulgarian capital of Turnovo: the marriage of Milutin and Anna, the daughter of Tsar Georgi I Terter; the marriage of Theodora, the daughter of King Smilets (1292–1298) and Stefan, future King Stefan Dečanski, the son of Milutin; and the marriage project between the widow of Smilets and Milutin himself. The other two are the result of Serbia’s relations with the north-western Bulgarian city of Vidin: the marriage of Shishman with the daughter of Dragoš, the grand župan of Milutin and the marriage of Mihail Shishman with Anna/Neda, Milutin’s daughter. Keywords: Milutin, Georgi I Terter, Stefan Dečanski, Mihail Shishman, Anna/Neda, diplomatic marriages.


1914 ◽  
Vol 1 (6) ◽  
pp. 265-271 ◽  
Author(s):  
E. J. Garwood

In my account of the Lower Carboniferous rocks of the North-West of England, published in 1912, I figured an organism, probably the thallus of a calcareous alga, which plays an important part as a rock-builder at the base of the Seminula gregaria sub-zone in Westmorland and Lancashire. More recently, at the meeting of the British Association in Birmingham, I pointed out the need of some distinctive name for this important form, and suggested for it the generic name of ‘Ortonella’, from the village of Orton, near Tebay, in the neighbourhood of which this fossil is specially abundant. Two other structures were mentioned at the same time which occur constantly in microscopic sections of the Lower Carboniferous rocks of the North-West of England and elsewhere. The first of these was alluded to under the general descriptive term ‘festoon structure’, and the other was referred to Gurich's somewhat obscure genus Spongiottroma. In view of the zonal value of these organisms in the North-Western Province and the probability that they will be found to be widely distributed in the Lower Carboniferous rocks elsewhere, I propose here to give a somewhat fuller description of these forms than could be attempted in the limits of a presidential address.


1875 ◽  
Vol 2 (11) ◽  
pp. 539-544 ◽  
Author(s):  
G. A. Lebour

When a group of beds has well-defined boundaries above and below, and when moreover its palæontological characteristics coincide with its stratigraphical limits, it becomes a boon alike to the field-geologist and to the fossil collector. When, on the other hand, both limits and fossils fail to enable one to follow a group beyond a certain point, the sooner the series as such is relegated to the limbo of purely-local, convenient, but untrue divisions, the better. I propose to show in this paper that the important group of beds commonly known as the Yoredale Series in the North-Western parts of Yorkshire is a group of the latter kind, convenient indeed in that district, but quite incapable of being traced much further North either stratigraphically or palæontologically.


2015 ◽  
Vol 23 (6) ◽  
pp. 903-912 ◽  
Author(s):  
Abdesslam Elhaddad ◽  
Amal ElAmrani ◽  
Alberto Fereres ◽  
Aranzazu Moreno

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