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https://www.readbyqxmd.com/read/28711248/the-effect-of-source-of-supplemental-dietary-calcium-and-magnesium-in-the-peripartum-period-and-level-of-dietary-magnesium-postpartum-on-mineral-status-performance-and-energy-metabolites-in-multiparous-holstein-cows
#1
B M Leno, S E LaCount, C M Ryan, D Briggs, M Crombie, T R Overton
The objective of this study was to determine the effects of feeding different supplemental sources of Ca and Mg in the peripartum period, and different dietary levels of Mg postpartum, on plasma mineral status, performance, and aspects of energy metabolism in transition dairy cows. Multiparous Holstein cows (n = 41) were used in a completely randomized design with a 2 × 2 factorial arrangement of treatments starting at 28 d before expected parturition. Main effects were source assignments (CS = common sources of supplemental Ca and Mg, or MA = a blend of common and commercial mineral sources with supplemental minerals primarily from a commercial Ca-Mg dolomite source; MIN-AD, Papillon Agricultural Company Inc...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28691279/paleoecology-of-neoproterozoic-hypersaline-environments-biomarker-evidence-for-haloarchaea-methanogens-and-cyanobacteria
#2
R Schinteie, J J Brocks
While numerous studies have examined modern hypersaline ecosystems, their equivalents in the geologic past, particularly in the Precambrian, are poorly understood. In this study, biomarkers from ~820 million year (Ma)-old evaporites from the Gillen Formation of the mid-Neoproterozoic Bitter Springs Group, central Australia, are investigated to elucidate the antiquity and paleoecology of halophiles. The sediments were composed of alternating laminae of dolomitized microbial mats and up to 90% anhydrite. Solvent extraction of these samples yielded thermally well-preserved hydrocarbon biomarkers...
July 10, 2017: Geobiology
https://www.readbyqxmd.com/read/28679041/synthesis-photocatalytic-and-antifungal-properties-of-mgo-zno-and-zn-mg-oxide-nanoparticles-for-the-protection-of-calcareous-stone-heritage
#3
A Sierra-Fernandez, S C De la Rosa-García, L S Gomez-Villalba, S Gómez-Cornelio, M E Rabanal, R Fort, P Quintana
More recently, the biological colonization of stone heritage and consequently its biodeterioration has become the focus of numerous studies. Among all microorganisms, fungi are considered to be one of the most important colonizers and biodegraders on stone materials. This is why the development of new antifungal materials requires immediate action. ZnMgO nanoparticles (NPs) have several exciting applications in different areas, highlighting as an efficient antimicrobial agent for medical application. In this research, the application of Zn-doped MgO (Mg1-xZnxO, x = 0...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28666196/dynamics-of-soil-organic-carbon-in-density-fractions-during-post-agricultural-succession-over-two-lithology-types-southwest-china
#4
Li Wen, Dejun Li, Hao Chen, Kelin Wang
Agricultural abandonment has been proposed as an effective way to enhance soil organic carbon (SOC) sequestration. Nevertheless, SOC sequestration in the long term is largely determined by whether the stable SOC fractions will increase. Here the dynamics of SOC fractions during post-agricultural succession were investigated in a karst region, southwest China using a space-for-time substitution approach. Cropland, grassland, shrubland and secondary forest were selected from areas underlain by dolomite and limestone, respectively...
June 27, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28664494/can-liming-change-root-anatomy-biomass-allocation-and-trace-element-distribution-among-plant-parts-of-salix-%C3%A3-smithiana-in-trace-element-polluted-soils
#5
Stanislava Vondráčková, Pavel Tlustoš, Jiřina Száková
Willows (Salix spp.) are considered to be effective for the phytoremediation of trace elements from contaminated soils, but their efficiency is limited in heavily polluted soils because of poor growth. Liming can be a desirable measure to decrease the plant availability of elements, resulting in improved plant development. Notably, large root area and maximum soil penetration are basic parameters that improve the efficiency of phytoremediation. The impact of soil chemical properties on willow root anatomy and the distribution of trace elements below-ground have rarely been studied...
June 29, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28621394/influence-of-various-soluble-carbonates-on-the-hydration-of-portland-cement-studied-by-x-ray-diffraction
#6
Simona Medvešček, Venčeslav Kaučič, Anton Meden
The effect of limestone on the hydration of Portland cement has been studied by many researchers. However, a possible influence of adding more soluble carbonates was not explained. Therefore we executed a qualitative and quantitative research on the influence of slightly soluble (CaCO3, MgCO3, dolomite), medium soluble (Li2CO3) and highly soluble (K2CO3 and KHCO3) carbonates on the hydration. Blending of Portland cement with differently soluble carbonates was found to influence the hydrate assemblage of the hydrated cement...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28580442/cation-exchange-in-the-presence-of-oil-in-porous-media
#7
R Farajzadeh, H Guo, J van Winden, J Bruining
Cation exchange is an interfacial process during which cations on a clay surface are replaced by other cations. This study investigates the effect of oil type and composition on cation exchange on rock surfaces, relevant for a variety of oil-recovery processes. We perform experiments in which brine with a different composition than that of the in situ brine is injected into cores with and without remaining oil saturation. The cation-exchange capacity (CEC) of the rocks was calculated using PHREEQC software (coupled to a multipurpose transport simulator) with the ionic composition of the effluent histories as input parameters...
April 20, 2017: ACS earth & space chemistry
https://www.readbyqxmd.com/read/28559731/developing-a-molecular-identification-assay-of-old-landraces-for-the-genetic-authentication-of-typical-agro-food-products-the-case-study-of-the-barley-agordino
#8
Fabio Palumbo, Giulio Galla, Gianni Barcaccia
The orzo Agordino is a very old local variety of domesticated barley (Hordeum vulgare ssp. distichum L.) that is native to the Agordo District, Province of Belluno, and is widespread in the Veneto Region, Italy. Seeds of this landrace are widely used for the preparation of very famous dishes of the dolomitic culinary tradition such as barley soup, bakery products and local beer. Understanding the genetic diversity and identity of the Agordino barley landrace is a key step to establish conservation and valorisation strategies of this local variety and also to provide molecular traceability tools useful to ascertain the authenticity of its derivatives...
March 2017: Food Technology and Biotechnology
https://www.readbyqxmd.com/read/28525719/phosphorus-availability-and-release-pattern-from-activated-dolomite-phosphate-rock-in-central-florida
#9
Xiaoyun Mao, Qin Lu, Wei Mo, Xiaoping Xin, Xian Chen, Zhenli He
In this study, novel technology was developed to convert dolomite phosphate rock (DPR) into slow release P fertilizers. The DPR was powdered to <100 mesh and activated with organic molecules under optimal reaction conditions. As compared to original DPR, available P, estimated by water-soluble P released from the three DPRs activated with three types of organic molecules, increased by 6.86, 3.32, and 7.46 times, respectively. Phosphorus supply from the activated DPRs was greater than that of superphosphates (SP)...
June 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28521958/eutrophication-decrease-phosphate-adsorption-processes-in-presence-of-nitrates
#10
Susana P Boeykens, M Natalia Piol, Lisa Samudio Legal, Andrea B Saralegui, Cristina Vázquez
Eutrophication causes aquatic environment degradation as well as serious problems for different purposes of water uses. Phosphorus and nitrogen, mainly as phosphate and nitrate respectively, are considered responsible for eutrophication degradation. The focus of this work was the study of adsorption processes for decreasing phosphate and nitrate concentrations in bi-component aqueous systems. Dolomite and hydroxyapatite were selected as low-cost adsorbents. Obtained results showed that both adsorbents have high capacity for phosphate adsorption which the presence of nitrate does not modify...
May 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28463699/waste-heaps-left-by-historical-zn-pb-ore-mining-are-hotspots-of-species-diversity-of-beech-forest-understory-vegetation
#11
Marcin W Woch, Anna M Stefanowicz, Małgorzata Stanek
Metalliferous mining and smelting industries are associated with very high levels of heavy metal(loid) contamination of the environment. Heavy metals have been proved to significantly influence the species diversity and composition of grassland communities, but little is known on their effects on forest understory vegetation. Therefore, the aim of this study was to investigate the effects of the presence of small heaps of waste rock left by historical Zn-Pb ore mining on understory vegetation. The heaps are scattered over vast areas of beech forests in southern Poland...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28401910/smelting-magnesium-metal-using-a-microwave-pidgeon-method
#12
Yuji Wada, Satoshi Fujii, Eiichi Suzuki, Masato M Maitani, Shuntaro Tsubaki, Satoshi Chonan, Miho Fukui, Naomi Inazu
Magnesium (Mg) is a lightweight metal with applications in transportation and sustainable battery technologies, but its current production through ore reduction using the conventional Pidgeon process emits large amounts of CO2 and particulate matter (PM2.5). In this work, a novel Pidgeon process driven by microwaves has been developed to produce Mg metal with less energy consumption and no direct CO2 emission. An antenna structure consisting of dolomite as the Mg source and a ferrosilicon antenna as the reducing material was used to confine microwave energy emitted from a magnetron installed in a microwave oven to produce a practical amount of pure Mg metal...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28291791/three-dimensional-preservation-of-cellular-and-subcellular-structures-suggests-1-6-billion-year-old-crown-group-red-algae
#13
Stefan Bengtson, Therese Sallstedt, Veneta Belivanova, Martin Whitehouse
The ~1.6 Ga Tirohan Dolomite of the Lower Vindhyan in central India contains phosphatized stromatolitic microbialites. We report from there uniquely well-preserved fossils interpreted as probable crown-group rhodophytes (red algae). The filamentous form Rafatazmia chitrakootensis n. gen, n. sp. has uniserial rows of large cells and grows through diffusely distributed septation. Each cell has a centrally suspended, conspicuous rhomboidal disk interpreted as a pyrenoid. The septa between the cells have central structures that may represent pit connections and pit plugs...
March 2017: PLoS Biology
https://www.readbyqxmd.com/read/28287717/reaction-rates-in-chemically-heterogeneous-rock-coupled-impact-of-structure-and-flow-properties-studied-by-x-ray-microtomography
#14
Yousef Al-Khulaifi, Qingyang Lin, Martin J Blunt, Branko Bijeljic
We study dissolution in a chemically heterogeneous medium consisting of two minerals with contrasting initial structure and transport properties. We perform a reactive transport experiment using CO2-saturated brine at reservoir conditions in a millimeter-scale composite core composed of Silurian dolomite and Ketton limestone (calcite) arranged in series. We repeatedly image the composite core using X-ray microtomography (XMT) and collect effluent to assess the individual mineral dissolution. The mineral dissolution from image analysis was comparable to that measured from effluent analysis using inductively coupled plasma mass spectrometry (ICP-MS)...
March 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28283029/legal-immigrants-invasion-of-alien-microbial-communities-during-winter-occurring-desert-dust-storms
#15
Tobias Weil, Carlotta De Filippo, Davide Albanese, Claudio Donati, Massimo Pindo, Lorenzo Pavarini, Federico Carotenuto, Massimiliano Pasqui, Luisa Poto, Jacopo Gabrieli, Carlo Barbante, Birgit Sattler, Duccio Cavalieri, Franco Miglietta
BACKGROUND: A critical aspect regarding the global dispersion of pathogenic microorganisms is associated with atmospheric movement of soil particles. Especially, desert dust storms can transport alien microorganisms over continental scales and can deposit them in sensitive sink habitats. In winter 2014, the largest ever recorded Saharan dust event in Italy was efficiently deposited on the Dolomite Alps and was sealed between dust-free snow. This provided us the unique opportunity to overcome difficulties in separating dust associated from "domestic" microbes and thus, to determine with high precision microorganisms transported exclusively by desert dust...
March 10, 2017: Microbiome
https://www.readbyqxmd.com/read/28281141/oxidative-potential-op-and-mineralogy-of-iron-ore-particulate-matter-at-the-gol-e-gohar-mining-and-industrial-facility-iran
#16
Naghmeh Soltani, Behnam Keshavarzi, Armin Sorooshian, Farid Moore, Christina Dunster, Ana Oliete Dominguez, Frank J Kelly, Prakash Dhakal, Mohamad Reza Ahmadi, Sina Asadi
Concentrations of total suspended particulate matter, particulate matter with aerodynamic diameter <2.5 μm (PM2.5), particulate matter <10 μm (PM10), and fallout dust were measured at the Iranian Gol-E-Gohar Mining and Industrial Facility. Samples were characterized in terms of mineralogy, morphology, and oxidative potential. Results show that indoor samples exceeded the 24-h PM2.5 and PM10 mass concentration limits (35 and 150 µg m(-3), respectively) set by the US National Ambient Air Quality Standards...
March 9, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28265834/characteristics-and-quality-of-reservoir-sediments-mujib-dam-central-jordan-as-a-case-study
#17
Nazem El-Radaideh, Ahmed A Al-Taani, Wesam M Al Khateeb
This paper focuses on characterizing the current status of physiochemical properties of Mujib Dam sediments. Five types of granulometric textural facies were observed for the bottom sediments of Mujib reservoir bed; these are clayey facies, clayey-silt facies, sand-silt-clay facies, sand facies, and granule facies. This average grain size will likely play a vital role in adsorption-desorption of the majority trace metals to the reservoir lake. Other sediment parameters including the total averages were 5.9% (total organic matter (TOM)), 7...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28251545/impact-of-tillage-practices-on-soil-bacterial-diversity-and-composition-under-the-tobacco-rice-rotation-in-china
#18
Yanping Lei, Yongliang Xiao, Lifeng Li, Chaoqiang Jiang, Chaolong Zu, Tian Li, Hui Cao
Tobacco-rice rotation is a common farming system in south China, and many tillage practices such as straw mulching, dolomite dust, and quicklime application have been adopted to improve crop production. These agricultural management practices alter soil physical and chemical properties and affect microbial life environment and community composition. In this research, six tillage practices including no tobacco and rice straw mulching (CK), tobacco and rice straw mulching (TrSr), rice straw returning fire (TrSc), tobacco and rice straw mulching with dolomite dust (TSD), rice straw returning fire and quicklime (TSQ), and rice straw returning fire, quicklime and reduced fertilizer (TSQf) were conducted to detect changes in soil bacterial diversity and composition using Illumina sequencing...
May 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28249180/release-of-hydrogen-sulfide-during-microwave-pyrolysis-of-sewage-sludge-effect-of-operating-parameters-and-mechanism
#19
Jun Zhang, Wei Zuo, Yu Tian, Linlin Yin, Zhenlong Gong, Jie Zhang
The effects of sludge characteristics, pyrolysis temperature, heating rate and catalysts on the release of H2S and mechanism of H2S formation during sludge pyrolysis were investigated in a microwave heating reactor (MHR). The evolution of sulfur-containing compounds in the pyrolysis chars obtained at temperature range of 400-800°C was characterized by XPS. For a given temperature, the maximum concentration of H2S appeared at moisture content of 80%. Compared to the influence of heating rate on the H2S yields, pyrolysis temperature and catalyst played a more significant role on the release of H2S during microwave pyrolysis process...
February 23, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28224337/influence-of-ameliorating-soil-acidity-with-dolomite-on-the-priming-of-soil-c-content-and-co2-emission
#20
Muhammad Shaaban, Lei Wu, Qi-An Peng, Lukas van Zwieten, Muhammad Afzal Chhajro, Yupeng Wu, Shan Lin, Muhammad Mahmood Ahmed, Muhammad Salman Khalid, Muhammad Abid, Ronggui Hu
Lime or dolomite is commonly implemented to ameliorate soil acidity. However, the impact of dolomite on CO2 emissions from acidic soils is largely unknown. A 53-day laboratory study was carried out to investigate CO2 emissions by applying dolomite to an acidic Acrisol (rice-rapeseed rotation [RR soil]) and a Ferralsol (rice-fallow/flooded rotation [RF soil]). Dolomite was dosed at 0, 0.5, and 1.5 g 100 g(-1) soil, herein referred to as CK, L, and H, respectively. The soil pH(H2O) increased from 5.25 to 7...
April 2017: Environmental Science and Pollution Research International
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