449 research outputs found
Evidence for electron-phonon interaction in FeMSb (M=Co, Cr) single crystals
We have measured polarized Raman scattering spectra of the
FeCoSb and FeCrSb (00.5)
single crystals in the temperature range between 15 K and 300 K. The highest
energy symmetry mode shows significant line asymmetry due to phonon
mode coupling width electronic background. The coupling constant achieves the
highest value at about 40 K and after that it remains temperature independent.
Origin of additional mode broadening is pure anharmonic. Below 40 K the
coupling is drastically reduced, in agreement with transport properties
measurements. Alloying of FeSb with Co and Cr produces the B mode
narrowing, i.e. weakening of the electron-phonon interaction. In the case of
A symmetry modes we have found a significant mode mixing
Application of a widely-used tropical anti-worm agent, mebendazole, in modern oncology
Although clinical trials have not been completed, it has already been confirmed that mebendazole, a well-known anti-parasitic drug widely used in the tropical areas, inhibits cancer cell growth. Preclinical studies show that mebendazole notably impedes the growth of malignant and metastatic tumors such as osteosarcoma and soft tissue sarcoma, melanoma, carcinoma (lung, colorectal, breast, ovarian, hepatocellular and adrenocortical), acute myeloid leukaemia, glioblastoma multiforme andĀ meduloblastoma. Mebendazole can induce the depolymerization of microtubules in neoplasms and newly formed vasculature, stopping tumor growth and neoangiogenesis, along with other proposed mechanisms of action.Keywords: Anthelmintic, Mebendazole, Cancer treatment, Antimicrotubullar effect, Antineoangiogenesi
On Some Properties of Silver Iodide
In order to obtain the relation between several factors affecting
the colloido-chemical properties of silver iodide in the heterogeneous
exchange processes, the following measurements were carried
out: determination of the adsorption capacity of silver iodide (radiometry)
tempered from 20 up to 400 Ā°c, dry aged for 20 days to 5
years, pressed at 500 and 1500 kg cm-2 (on dried isoelectric precipitate);
determination of the relation between particle size (electron
microscopy) and crystallite size (X-ray diffraction analysis), and
of the adsorption capacity of AgI (formed by dilution of KI + AgI
complex solution) in the presence of sodium laurylsulphate (SLS);
determination of the surface area (BET) of the tempered isoelectric
dried silver iodide; determination of particle size and determination
of the volume fraction of cubic and hexagonal modifications
of AgI in the tempered samples. In conclusion, the effect of the inner
surface as a possible relevant factor for the elucidation of the
influence of surface active substances on acceleration of the
exchange rate is pointed out. Interactions with sodium laurylsulphate
are also discussed
Ecological analysis of aquatic macroinvertebrate communities in three types of running waters in Belgrade region
ProuÄavanjem zajednica akvatiÄnih makrobeskiÄmenjaka tekuÄih voda na podruÄju
Beograda u periodu 2007-2011. godina zabeleženo je 115 taksona iz 48 porodica, 8 klasa i 5
razdela. Istraživani vodotoci nalaze se pod velikim antropogenim stresom i prema važeÄem
Pravilniku o parametrima ekoloŔkog i hemijskog statusa povrŔinskih voda i parametrima
hemijskog i kvantitativnog statusa podzemnih voda (Službeni glasnik RS 74/2011), svrstani
su u tri tipa i to: tip 1, vrlo velike ravniÄarske reke sa dominacijom finog nanosa ā Dunav i
Sava; tip 2, velike reke sa dominacijom srednje krupnog nanosa ā Kolubara; i tip 3, male i
srednje velike reke nadmorske visine do 500 m sa dominacijom krupnog nanosa ā
TopÄiderska i ŽelezniÄka reka. Istraživanja su vrÅ”ena od 2007. do 2011. godine u periodu
visokih voda (maj/jun) i niskih voda (septembar/oktobar). TakoÄe je koriÅ”Äen i materijal
prikupljen u periodu od 1996. do 2000. godine od strane istaživaÄa laboratorije Odeljenja za
hidroekologiju i zaÅ”titu voda Instituta za bioloÅ”ka istraživanja "SiniÅ”a StankoviÄ" Univerziteta
u Beogradu.
U tipu 1 vodotoka na podruÄju Beograda zabeležena su 63 taksona u Dunavu i 43 u
Savi, sa dominacijom oligoheta. NajveÄi broj taksona zabeležen je u tipu 2 vodotoka, 78
taksona u Kolubari, sa dominacijom insekatske komponente u zajednici. U tipu 3 vodotoka, u
TopÄiderskoj i ŽelezniÄkoj reci, zabeleženo je 25, odnosno 36 taksona, pri Äemu je u
TopÄiderskoj reci dominirala grupa oligoheta, dok su u ŽelezniÄkoj reci najveÄi udeo u
zajednici imale hironomide. PoreÄenjem sa rezultatima prethodnih istraživanja, analizirane su
promene u sastavu i strukturi zajednica u istraživanim tokovima.
Rezultati multivarijantne analize ukazuju da je karakteristiÄnoj distribuciji vrsta u sva
tri tipa istraživanih vodotoka u najveÄoj meri doprineo hemijski sastav sedimenta. FiziÄki i
hemijski parametri vode su takoÄe, u velikoj meri, pokazali uticaj na zajednice akvatiÄnih
beskiÄmenjaka. UoÄeno je da je u velikim rekama efikasnije razmatrati vezu zajednice
akvatiÄnih beskiÄmenjaka i viÅ”emeseÄne proseÄne vrednosti fiziÄkih i hemijskih parametara
vode, dok su u manjim vodotocima bujiÄnog karaktera trenutno izmerene vrednosti pokazale
veÄi uticaj na zajednice akvatiÄnih beskiÄmenjaka...During the survey of the communities of aquatic macroinvertebrates of rivers and
streams in Belgrade region 115 taxa from 48 families, 8 classes and 5 phyla were detected.
These waterbodies are under a high anthropogenic stress and, based on the Regulation on the
parameters of the ecological and chemical status of surface waters and the parameters of the
chemical and quantitative status of groundwater (Official Gazette of RS 74/2011), they are
classified into three types: Type 1, large lowland rivers with the domination of fine bottom
sediments ā the Danube and the Sava River; Type 2, large rivers with the domination of
medium sized sediments ā the Kolubara River; and Type 3, small to medium sized rivers at
elevation of up to 500 m, with the domination of the hard bottom substrate ā the TopÄiderska
River and the ŽelezniÄka River. The research was carried out from 2007 to 2011, in the period
of high water levels (May/June) and of low water levels (September/October). Additional
material, collected from 1996 to 2000 by researchers from the laboratory of the Department of
Aquatic Ecology of the Institute for Biological Research "SiniÅ”a StankoviÄ" of the University
of Belgrade, was also included in the analyses.
In the Type 1 watercourses in Belgrade region, 63 taxa were recorded in the Danube
and 43 in the Sava River, with Oligochaeta as the dominant group. The largest number of taxa
were identified in the Type 2 watercourses, 78 taxa in the Kolubara River, with the dominance
of the insect component of the community. In the Type 3 watercourses, in the TopÄiderska
River and the ŽelezniÄka River, 25 and 36 taxa were recorded, respectively. While
Oligochaeta prevailed in the TopÄiderska River, Chironomidae were the dominant group in
the ŽelezniÄka River. Changes in the composition and structure of communities in the studied
streams were observed following the comparison with the previous findings.
The results of a multivariate analysis indicate that the chemical composition of the
sediment largely contributed to the characteristic distribution of species in all three
investigated watercourses. Physical and chemical parameters of water also showed a
significant impact on communities of aquatic invertebrates. Our results suggest that it is more
effective to analyse the relation of the average values of chemical parameters across several
months and macroinvertebrate assemblages in the case of large rivers, while for smaller size
watercourses of torrential character, the current values of chemical parameters were better
correlated with these communities and had a greater impact on them..
Streamlining collection of training samples for object detection and classification in video
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