Characterization of Mongolian natural minerals and their application for heavy metal adsorbent

In this study, the structural characteristic and the adsorption properties of heavy metals on Mongolian natural minerals were investigated. The natural samples were confirmed as Heulandite group of Clinoptilolite type zeolite and clay sample that contains albite and quartz by X-ray diffraction analysis. According to BET surface analysis, natural zeolites have mesoporous type of pore. The results of adsorption study showed that adsorption ability of natural zeolite is high effective for lead ion in acidic aqueous solution and the order of heavy metal selectivity was Pb2+>>Zn2+>Cd2+. The adsorption performance of Arsenic(V) is significantly increased by modification with magnesium oxide on natural zeolite

MITOCHONDRIAL DNA ANALYSIS OF ANCIENT DOMESTIC GOAT IN THE MONGOLIA

Food and agricultural production sector, especially livestock production is vital for Mongolia’s economic and social development. The five breeds of livestock – cattle, horses, sheep, goats and camels, have always been directly related to the history, culture and economy of Mongolia. It is undeniable that these five breeds of livestock are considered as an important asset of the Mongolian economy as well as guarantee of national security. Out of the five breeds, small livestock including sheep and goats account for more than 80% of the total livestock population (according to the National Statistical Office data). It is not hard to retrieve research and recorded materials about the morphology or the economic productivity of these breeds and their sub-breeds. However, the development of society now demands higher yield from the livestock animals. Genetically, the a1, a2, a3 and a4 samples appertaining to some 3,000 years ago are substantially different from the haplogroups. However, judging by the phylogenetic tree the 800 year-old samples, as compared to the phylogroups of the 3rd century BC, are closer to the modern samples. Alongside this, from molecular distance we find that the M1 haplogroup is a sample belonging to the 3rd century BC, which had separated the earliest, while the aforementioned 800 year-old sample separates at a later period, which chronologically is convincing. But the a6 ancient sample conforms to the B haplogroup and the a8 or the sample of 800 years ago is in the same haplogroup as the sample of the 3rd century BC. However, the a6 sample obtained from the 3rd century BC tombs obtained sample was the origin of modern goats that can be included in haplogroup B

Caractérisation des caséines du lait de jument. Propriétés biologiques du lait équin fermenté (Koumiss)

* CR de Nantes. Service de Documentation. BP 71627. 44316 Nantes Cedex 03 Diffusion du document : CR de Nantes. Service de Documentation. BP 71627. 44316 Nantes Cedex 03 Diplôme : Dr. d'Universit

MITOCHONDRIAL DNA STUDY OF MONGOLIAN EQUUS CABALLUS

In order to assess the genetic diversity and maternal lineages of Mongolian native horse populations, we examined using mitochondrial DNA control region sequence analyses. The control region of mitochondrial DNA is widely used for population and evolutionary studies because of its high level of sequence variation, in addition to a lack of recombination and maternal heritance. To determine genetic diversity and maternal heritance, we collected 19 blood samples of Darhad horses from Khuvsgul, Tes horses from Zavkhan and Taij horses from Dundgobi, Mongolia.In this study, 16 haplotypes and 51 polymorphic sites were detected. Haplotype diversity was 0.9766 and nucleotide diversity was 0.0212 in Mongolian native horses. Finally, 5 horse haplogroups (A, C, D, F, I) were identified in 16 haplotypes in this study

Effect of the collision medium size on thermal performance of silver nanoparticles based aqueous nanofluids

The present paper describes an influence of different ball sizes (1 mm, 3 mm and 5 mm) of the planetary ball milling machine on the thermal conductivity characteristics of silver-based aqueous nanofluids. Nano-metric silver dispersed water based nanofluids with various loadings (1 wt%, 2 wt% and 3 wt%) have been prepared by a single-step approach. It has been observed that the ground silver nanoparticles suspended in conventional fluids have superior thermal conductivity performance mainly due to flattened particles and/or increased aspect ratio. The silver particles present in colloidal phase have been characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-visible spectroscopy, particle sizing system (PSS) and zeta potential measurements. The stability as well as thermal conductivity of these nanofluids have been measured at wavelength ranging from 300 to 800 nm and at temperature ranging 20-40 C, respectively. As a result, the silver nanoparticles ground by 1 mm ball size that dispersed in aqueous solution (1 wt%) is showed highest thermal conductivity (621 W/mk) which was greater than that of the nanofluids prepared by other conditions, at a temperature of 40 C. A significant trends in the thermal conductivity of nanofluids are attributed to several specific reasons which have been discussed in this article

Effect of N719–dye adsorption into composition of different sized TiO<SUB>2</SUB> films for photovoltaic performance of the dye-sensitized solar cells

Effect of N719-dye adsorption into TiO films prepared via incorporating small (~15 nm) and large (~300 nm) TiO nanoparticles at several ratios were investigated to improve the photovoltaic efficiency of dye-sensitized solar cell. The photovoltaic efficiency is significantly improved after incorporation of large and small TiO nanoparticles. From experimental result, the composition with 70% small: 30% large TiO is found as an optimum mixing ratio for the best performance (5.57%) of a dye-sensitized solar cell. This high photovoltaic performance is attributed to an effect of following factors. Besides an increase in dye molecules adsorption, the light scattering of over layer large TiO enhances harvesting light of the solar cells and the under layer small TiO ensures good electronic contact between film electrode and the fluorine-doped tin oxide glass substrate. However, we found that the composition with 50% small: 50% large TiO was adsorbed much more N719-dye molecule than that of the other mixtures of TiO and hence resulting in a decrease photovoltaic performance. This decrement of performance may be attributed to the decreased surface area and dye aggregation

Characterization of mare caseins. Identification of alpha S1- and alpha S2 caseins

International audienc

An experimental study of the planetary ball milling effect on dispersibility and thermal conductivity of MWCNTs-based aqueous nanofluids

The present study conducted two different structures, namely raw and acid oxidized multi-walled carbon nanotubes (MWCNTs) were ground under wet condition at various rotation speeds (300-600 rpm). The ground MWCNTs were dispersed in aqueous solution by ultrasonication was investigated. The particle size analyzer reveals the agglomerated size of raw MWCNTs ground at a rotation speed of 300 rpm was 69.2 μm. Nevertheless, the agglomerated size of particle significantly decreased to 13.2 μm after grinding at a rotation speed of 600 rpm. The maximum absorbance (4.0 abs at a wavelength of 300 nm) and highest thermal conductivity enhancement (18.12% at 40°C) of suspensions correspond to the grinding speed of 600 rpm assisted by ultrasonication dispersion of the purified and raw structures, respectively. It is found that the grinding method with high rotation speed plays can be significantly increased both the dispersibility and thermal conductivity of raw and purified MWCNTs nanofluids

Characterization of whey proteins from Mongolian yak, Khainak, and Bactrian camel

The composition of whey proteins from ruminant Mongolian domestic animals was analysed and a comparative study between camel (Camelus bactrianus) and dromedary (Camelus dromedarius) was made