TODOROVA, Y., St. LINCHEVA and Y. TOPALOVA, 2014. Risk management scenario for multiple heavy metal contamination at river sediments in the Middle Iskar cascade. Bulg. J. Agric. Sci., Supplement 1: 100–104 In the middle part of Iskar River, the effects of complex pollution with organics and diffi cult-biodegradable compounds have been observed from decades. Nowadays this part of the river is a ...

JCB • VOLUME 181 • NUMBER 5 • 2008 714 rDNA si lencing saves starving cel ls H istone methylation at ribosomal genes saves cells when sugar is in short supply, say Akiko Murayama, Junn Yanagisawa (University of Tsukuba, Japan), and colleagues. The team identifi es multiple parts of the machinery that links energy levels to epigenetics. Ribosome biogenesis demands lots of energy, and rDNA transc...

Flavivirus reveals its access code Fritz et al. have identifi ed an amino acid switch that fl aviviruses fl ip to gain access to cells. Flaviviruses such as tick-borne encephalitis virus (TBEV), yellow fever, and dengue are dangerous human pathogens. These membrane-encircled viruses enter cells by being gobbled up into endosomes and fusing their membrane with that of the endosome. Fusion is tri...

the natural teeth are the most durable organs in the bodies of vertebrates, and humankind’s understanding of their own past and evolution relies heavily upon remnant dental evidence found as fossils. the use of features unique to the human dentition as an aid to personal identifi cation is widely accepted within the forensic fi eld. comparative dental identifi cations play a major role in ident...

cation exchange capacity and specific surface area are among some of the important soil characteristics the direct measurement of which is laborious, costly and time consuming. therefore, fractal dimension of particle size distribution has been widely studied in relation with many such dynamic and static processes as transmission of water and solutes, water holding capacity, heat storage and co...

Background: In recent years, nanomaterials have been widely used in large quantities which make people bemore frequently exposed to the chemically synthesized nanoparticles (NPs). When NPs are introduced intoan organism, they may interact with a variety of cellular components with yet largely unknown pathologicalconsequences.Objective: I...

karkhe watershed (kw) with more than 5 million hectares recently encountered many problems in the natural, social and man-made habitats. unsuitable use of land, soil erosion and lack of rainfall are the most destructive factors in this watershed affecting the whole region fundamentally. as expected, these problems have caused a considerable fall in biodiversity in fauna and flora, a decrease in...

Some new compounds based on bis-benzimidazole moieties have been synthesized and characterized by IR and NMR spectroscopies. The ability of 3a in transition metal cation sensing such as Co2+, Ni2+, Zn2+, Mn2+, Fe2+ and Cu2+ have been investigated by Uv-vis and fluorescence spectroscopy in methanol solvent. The complexation constants and complex stoichiometry of Cu2+ have been determined. The ex...

In this study, the effect of variety of Nano- additives doping on the hydration resistance of the MgO-CaO system was investigated. Samples were prepared from calcined dolomite and magnesite. Nano-additives that contained cations with various valences (trivalent and tetravalent) used as  a dopant. The bulk density, apparent porosity and hydration resitance were studied and evaluated. Also, phase...