Potensi Mineral Cassiterite Dan Ilmenite Pada Daerah Bekas Penambangan Timah Bangka (Potency of Cassiterite and Ilmenite Mineral at Ex-Tin Mine Area Bangka)

Mining and processing minerals can not to reach obtaining (recovery) one hundred percents. Minerals that thrown with tailing, are minerals pricy that can to be exploited back as value add for company side. Before be done reklamasi and mine closing, necessary be knowing mineral \u27s potency that still exist to mining ex area, to run the principle conservation of mineral resources. Research in mineral cassiterite and ilmenite that got to sediment tailing result tin washery, be done with way drilling with distance 100 x 50 m in sediment localization mine tailing TN 3.10 Air Lempuyang PT Timah (persero) Tbk with coordinate UTM (633672 E; 9748033 N). Wide of area the mentioned research be counted its wide with to use it mapinfo program and the coordinate\u27s withdrawal to use it Global Positioning System (GPS). Wide of area tailing\u27s sediment to be guessed ± 9,74 ha. Drilling process to get it sample/ conto be done with to use it hand auger. S ampel mentioned be analyzed in physics laboratory and chemistry that is grain counting minerals for 124 sample to know type and degree of minerals, 1 komposit\u27s sample be analyzed by classic method it\u27s volumetri and spectofotometri to know total Fe total and degree of TiO2. Laboratory analysical Result, identificated mineral cassiterite, ilmenite, pyrite, iron oksida, limonite, muscovite, tourmalin, sand clay and quatz. With to use it the method of area of influence calculation, be got resource number mineral cassiterite and ilmenite that got to sediment tailing mentioned

Immunohistochemical review of Leydig cell lesions in ochratoxin A-treated Fischer rats and controls

Ochratoxin A is best known as a potent renal carcinogen in male rats and mice after necessarily protracted ingestion, although valid extrapolation to any human disease has not been verified. The hypothesis that the toxin is a cause of human testicular cancer was proposed a decade ago and has proliferated since, partly through incomplete study of the scientific literature. Archived tumorous rat testes were available from Fischer F344 rats exposed to continuous dietary exposure for half of or the whole life in London in the 2000s. Renal cancer occurred in some of these cases and testicular tumours were observed frequently, as expected, in both treated and untreated animals. Application of clinical immunohistochemistry has for the first time consistently diagnosed the testicular hypertrophy in toxin-treated rats as Leydig cell tumours. Comparison is made with similar analysis of tumorous testes from control (untreated) rats from U.S. National Toxicology Program studies, both of ochratoxin A (1989) and the more recent one on Ginkgo biloba. All have been found to have identical pathology as being of sex cord-stromal origin. Such are rare in humans, most being of germinal cell origin. The absence of experimental evidence of any specific rat testicular cellular pathology attributable to long-term dietary ochratoxin A exposure discredits any experimental animal evidence of testicular tumorigenicity. Thus, no epidemiological connection between ochratoxin A and the incidence of human testicular cancer can be justified scientifically

EBF1-deficient bone marrow stroma elicits persistent changes in HSC potential

Crosstalk between mesenchymal stromal cells (MSCs) and hematopoietic stem cells (HSCs) is essential for hematopoietic homeostasis and lineage output. Here, we investigate how transcriptional changes in bone marrow (BM) MSCs result in long-lasting effects on HSCs. Single-cell analysis of Cxcl12-abundant reticular (CAR) cells and PDGFRα+Sca1+ (PαS) cells revealed an extensive cellular heterogeneity but uniform expression of the transcription factor gene Ebf1. Conditional deletion of Ebf1 in these MSCs altered their cellular composition, chromatin structure and gene expression profiles, including the reduced expression of adhesion-related genes. Functionally, the stromal-specific Ebf1 inactivation results in impaired adhesion of HSCs, leading to reduced quiescence and diminished myeloid output. Most notably, HSCs residing in the Ebf1-deficient niche underwent changes in their cellular composition and chromatin structure that persist in serial transplantations. Thus, genetic alterations in the BM niche lead to long-term functional changes of HSCs

Towards an optical potential for rare-earths through coupled channels

The coupled-channel theory is a natural way of treating nonelastic channels, in particular those arising from collective excitations, defined by nuclear deformations. Proper treatment of such excitations is often essential to the accurate description of reaction experimental data. Previous works have applied different models to specific nuclei with the purpose of determining angular-integrated cross sections. In this work, we present an extensive study of the effects of collective couplings and nuclear deformations on integrated cross sections as well as on angular distributions in a consistent manner for neutron-induced reactions on nuclei in the rare-earth region. This specific subset of the nuclide chart was chosen precisely because of a clear static deformation pattern. We analyze the convergence of the coupled-channel calculations regarding the number of states being explicitly coupled. Inspired by the work done by Dietrich \emph{et al.}, a model for deforming the spherical Koning-Delaroche optical potential as function of quadrupole and hexadecupole deformations is also proposed. We demonstrate that the obtained results of calculations for total, elastic and inelastic cross sections, as well as elastic and inelastic angular distributions correspond to a remarkably good agreement with experimental data for scattering energies above around a few MeV.Comment: 7 pages, 6 figures. Submitted to the proceedings of the XXXVI Reuni\~ao de Trabalho de F\'{\i}sica Nuclear no Brasil (XXXVI Brazilian Workshop on Nuclear Physics), held in Maresias, S\~ao Paulo, Brazil in September 2013, which should be published on AIP Conference Proceeding Series. arXiv admin note: substantial text overlap with arXiv:1311.1115, arXiv:1311.042

Deciduous Trees for South Dakota Landscapes

This publication was prepared to meet the need for an informative reference on deciduous trees in South Dakota. Also, this publication will be of regional value due to its rather extensive treatment of cultivars, including hybrid and clonal varieties

Characterization of hemodialysis membranes by inverse size exclusion chromatography

Inverse size exclusion chromatography (i-SEC) was used to characterize three different cellulosic hollow fiber hemodialysis membranes, i.e. low-flux cuprophan and hemophan and high-flux RC-HP400A. With the i-SEC technique the pore size distribution and porosity of a membrane can be determined and adsorption phenomena can be studied. The membranes showed clear differences in pore size and porosity, the high-flux RC-HP400A membrane has a larger pore size as well as a higher porosity. For all the membranes it was found that the elution curves were best described by a homoporous pore volume distribution. It appeared that the bound or non-freezing water in the membranes was at least partly accessible to solutes. The test molecules creatinine and vitamin B 12 both adsorbed to the cellulosic membranes. The adsorption behavior of creatinine was strongly dependent on the NaCl concentration present. The observations could be explained by assuming that cuprophan and RC-HP400A are negatively charged whereas hemophan is positively charged due to the modification with N,N-diethylaminoethyl ether. The net charge of the hemophan is smaller

Exploring the barriers to effective strategy implementation in a petrochemical organisation

Abstract: Organisations have increasingly become aware of how crucial developing strategies and plans are, in order to remain competitive. Organisations have in most cases been able to develop strategies, however one of their biggest challenges is during the implementation or execution of the set strategies. Without execution, strategies are deemed to be useless. The aim of the study was to explore the barriers to effective implementation of strategy at a petrochemical organisation in South Africa. Based on its exploratory nature, the study was conducted using a qualitative research method. Face-to-face semi-structured interviews were used and the collected data was analyzed with the use of open, axial and selective coding techniques