Agreement NNX16AC86A, Is ADS down? Mater. -. Epub 2015 Apr 15. This study aims to improve the coagulation time, strength, and construction cost of magnesium phosphate cement. The reaction between a reactive form of magnesia and acid ammo- nium phosphate is very rapid and exothermic, and the materials cannot be practically used as such. USA.gov. X-ray diffraction (XRD) patterns of FAC paste at different curing ages. In the specimens based on aluminophosphate bond the magnesia reacts with monosubstituted aluminum phosphate, and under these conditions di- and trisubstituted magnesium phosphates and aluminum orthophosphate are … We analyzed the microstructure changes in the hardened magnesium phosphate cement paste through qualitative analysis, quantitative test, microscopic examination, and research regarding adding different concentrations of acetic acid on magnesium phosphate cement … Calcium plays significant roles in cell structural components and biochemical functioning through signaling within and external to the cell. magnesium phosphate mixture calcium sulphate Prior art date 1962-11-23 Legal status (The legal status is an assumption and is not a legal conclusion. The production of fertilizer magnesium ammonium phosphate (MAP, Mg.NH 4 PO 4 .6H 2 O), commonly known as struvite, has been investigated in this study by mixing waste effluents of different sources. Novel tricalcium silicate/magnesium phosphate composite bone cement having high compressive strength, in vitro bioactivity and cytocompatibility. The microstructure and chemical composition were also analyzed by adopting scanning electron … 2020 Dec 7;13(23):5587. doi: 10.3390/ma13235587. Compressive strength of the MPC–FAC mortar with various dosages of FAC. The microstructure and chemical composition were also analyzed by adopting scanning electron microscopic energy-dispersive spectrometer and X-ray diffraction, respectively. The authors declare no conflict of interest. With the addition of FAC, a large number of cementitious materials of AFt and AFm, as well as flocculent colloidal substances of AH3, C-S-H, and FH3, were generated during the hydration of MPC, which were filled in the internal pore of the hydrate. Th… Use, Smithsonian Reaction of magnesium phosphate and hydrochloric acid Mg 3 (PO 4) 2 + 6HCl → 3MgCl 2 + 2H 3 PO 4 As a result of the reaction of magnesium phosphate (Mg 3 (PO 4) 2) and hydrochloric acid (HCl) produces magnesium chloride (MgCl 2), phosphoric acid (H 3 PO 4) Mg 3 (PO 4) 2 We report on quasielastic neutron scattering results focusing on the evolution of the state of water in the system during the setting reaction, to shed light on the reaction mechanisms and the nature of the products. Huxley School of the Environment, Earth Sciences and Engineering, Imperial College of Science, Technology and Medicine, London, UK. These results confirm that VAPOL magnesium phosphate is ideal for promoting the aza-Darzens reaction efficiently and with selectivity. Magnesium phosphate ceramics are a class of acid–base cements for bioengineering and civil engineering applications. During the reaction of phosphate bonds with magnesium oxide, magnesium phosphates are formed confering hardness on the magnesia concretes. In the most common magnesium phosphate, three divalent magnesium cations and two phosphate anions are attracted by means of the electrostatic force of attraction and an electrovalent structure of magnesium phosphate is produced. After conversion to the corresponding magnesium phosphate salt, both catalysts derived from P1 and P2 showed little enantioselectivity for the aza-Darzens reaction (entries 12–13). TRIMAGNESIUM PHOSPHATE. Compos. Magnesium hydrogen orthophosphate Calcium is essential for normal neuromuscular function and for correct functioning of the coagulation factors. Magnesia–phosphate cements (MPCs), or magnesium phosphate cements as sometimes referred to, are termed chemically bonded ceramics , as they are low-temperature high-strength materials formed by through-solution acid-based reaction between dead burnt magnesia and phosphate . In serum, the total calcium concentration is approximately 8.4 to 10.2 mg/dL (2.12.6 mmol/L). 2005;27:11–18. Tao Y, Zhenyu L, Yuanyuan W, Xin H, Jie W, Zhongyuan L, Shuzhen L, Feng L, Xiaoling F, Haibin Z. Sci Total Environ. Structure, properties, spectra, suppliers and links for: Magnesium phosphate (3:2). E-mail: l1979394@163.com; jysxuzhou@163.com; Tel: +86-139 … (, SEM images of MPC composite at different curing ages. José N, Ahmed H, Miguel B, Luís E, Jorge B. magnesium phosphate. Jia X, Luo J, Zhang W, Qian J, Li J, Wang P, Tang M. Materials (Basel). 650º; B.P. 6H2O is crystallized in a larger size and the morphology is changed from acicular to bladed and then prismatic shape. The magnesia residues can be well identified in all of the formulations. 1998;20:31–39. This site needs JavaScript to work properly. Magnesium will react with cabon dioxide, when heated, forming magnesium oxide and elemental carbon [6]: ... (II) is not precipitated by phosphate ions under acetic acid conditions. Abstract. Cement. Reaction of magnesium with carbon dioxide. Under neutral conditions it is precipitated as the hydrogen phosphate Cem. Disturbance to this balance can result in symptomatic disease and life-threatening manifestations. Concr. Clipboard, Search History, and several other advanced features are temporarily unavailable. Constr. Magnesium phosphate ceramics are a class of acid–base cements for bioengineering and civil engineering applications. doi: 10.1016/S0958-9465(97)00067-X. Each electrolyte is readily found in the human diet, and homeostasis is tightly regulated by the intestine, kidney and bone as well as other critical hormones, receptors and transporters. chem:ionic equations. magnesium hydrogen phosphate. Epub 2019 Nov 5. -. Molecules of water of crystallization may be attached to their crystals also. A certain amount of ferroaluminate cement (FAC) was substituted for MgO during the magnesium phosphate cement (MPC) preparation to obtain the MPC-FAC composite cement. Development of pH values of MPC–40FAC and MPC. Rev. ( a ) 1…, SEM images of MPC–40FAC composite at different curing ages (( a ) 1…, EDS of MPC or MPC–40FAC at different areas. Materials (Basel). The influence of FAC on the strength, water resistance, pH, and setting time of MPC-FAC composite cement were examined. Flexural Properties and Microstructure Mechanisms of Renewable Coir-Fiber-Reinforced Magnesium Phosphate Cement-Based Composite Considering Curing Ages. Thus, the internal compactness of the sample increased, while the compact protective covering layer was generated on the surface to enhance the water resistance and strength in the late curing time. Build. Stratful I(1), Scrimshaw MD, Lester JN. Calcium, phosphate and magnesium are essential for human function and life. The influence of FAC on the strength, water resistance, pH, and setting time of MPC–FAC composite cement were examined. doi: 10.1016/j.cemconcomp.2004.03.003. The study showed that setting time of MPC-FAC composite cement was dramatically prolonged when FAC substitution for MgO was between 30 and 40 wt %. The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Effluents form pigment preparation industry rich in ammonium carbonate and … Phosphoric acid, magnesium salt. Compressive strength of the MPC–FAC mortar at the age of 1 h. Development of pH values of MPC–40FAC and MPC. 7757-87-1. 2020 Oct 23;13(21):4752. doi: 10.3390/ma13214752. The setting reaction of magnesium phosphate cements starts with water addition to a mixture of ammonium phosphate and magnesium oxide, is very fast and takes place at room temperature (cold setting). doi: 10.1021/acs.chemrev.5b00463.  |  ( a ) Early period;…. Qiao F. Reaction Mechanisms of Magnesium Potassium Phosphate Cement and its Application. Retardation and reaction mechanisms of magnesium phosphate cement mixed with glacial acetic acid. Setting time of fresh magnesium phosphate cement–ferroaluminate cement (MPC–FAC) paste with different FAC…. Li Jun abc, Ji Yong-sheng * ac, Huang Guodong ac and Jin Cheng ac a State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, China 221008. Walling S.A., Provis J.L. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) -, Pera J., Ambroise J., Composites C. Fiber-reinforced magnesia-phosphate cement composites for rapid repair. Effect of aggregates and water contents on the properties of magnesium phospho-silicate cement. Conditions influencing the precipitation of magnesium ammonium phosphate. Magnesia (MgO) Production and Characterization, and Its Influence on the Performance of Cementitious Materials: A Review. Ding Z., Li Z. Magnesia-based cements: A journey of 150 years, and cements for the future? This is . Property evaluation of magnesium phosphate cement mortar as patch repair material. ( a ) Area 1;…, NLM Flexural strength of the MPC–FAC mortar with various dosages of FAC. Hong Kong University of Science and Technology; Hong Kong, China: 2010. See this image and copyright information in PMC. Using simple substrates, this methodology explores the scope and reactivity of a new magnesium catalyst for an aziridination reaction capable of building chirality and complexity simultaneously. 2020 Oct 31;12(11):2556. doi: 10.3390/polym12112556. Acta Biomater. 2 Na3PO4 + 3 MgCl2 = Mg3 (PO4)2 + 6 NaCl. Magnesium phosphate is a general term for salts of magnesium and phosphate appearing in several forms and several hydrates: 1 decade ago. This calcium exists in 2 different forms, namely, bound and free. 1120º; Density 1.74 g/cm 3; Characteristics: Magnesium is a silvery metal that is quite active, reacting slowly with boiling (but not cold) water to give hydrogen and the rather insoluble magnesium hydroxide, \(\ce{Mg(OH)2}\). How many grams of magnesium fluoride could be produced from the reaction of 10.5g of magnesium with excess fluorine. Small amount of boron compounds can be incorporated in the cement as a setting retarder. magnesia particles immediately react with phosphate in MPC hydration, producing amorphous and crystalline struvite. The anhydrous … Setting time of fresh magnesium phosphate cement–ferroaluminate cement (MPC–FAC) paste with different FAC content. XRD patterns of MPC paste at different curing ages. ferroaluminate cement; magnesium phosphate cement; properties; reaction mechanisms. National Center for Biotechnology Information, Unable to load your collection due to an error, Unable to load your delegates due to an error.  |  Hydration process and microstructure of magnesium potassium phosphate cement with nitrate solution. A certain amount of ferroaluminate cement (FAC) was substituted for MgO during the magnesium phosphate cement (MPC) preparation to obtain the MPC–FAC composite cement. For example, Ag3PO4 + HCl Reaction of magnesium phosphate and lithium Mg 3 (PO 4) 2 + 6Li → 2Li 3 PO 4 + 3Mg As a result of the reaction of magnesium phosphate (Mg 3 (PO 4) 2) and lithium (Li) produces lithium phosphate (Li 3 PO 4), magnesium (Mg) Preparation and Application of Self-Curing Magnesium Phosphate Cement Concrete with High Early Strength in Severe Cold Environments. moles Na3PO4 = 125 g /163.94 g/mol=0.762. 15H 2 O or other intermediate reaction products are formed during the early reaction. (image will be uploaded soon) Solution for Phosphoric acid reacts with magnesium hydroxide to produce magnesium phosphate and water via the following reaction:… We report on quasielastic neutron scattering results focusing on the evolution of the state of water in the system during the setting reaction, to shed light on the reaction mechanisms and the nature of the products. Astrophysical Observatory, Chemistry, Inorganic;Engineering, Civil;Engineering, Materials Science. Sodium Monohydrogen Phosphate; Magnesium Reagent; No Reaction; Most common oxidation state: +2; M.P. The octahydrate forms upon reaction of stoichiometric quantities of monomagnesium phosphate with magnesium hydroxide. Phosphoric acid, magnesium salt (2:3) Magnesium phosphate anhydrous Favorite Answer. The influence of FAC on the strength, water resistance, pH, and setting time … Magnesium hydrogenorthophosphate. Notice, Smithsonian Terms of The strength of MPC-FAC did not decrease during the early curing time (1 h and 1 d), whereas it increased during the late curing time (3, 7, and 28 days). Chem. Mg (H 2 PO 4) 2 + 2 Mg (OH) 2 → Mg 3 (PO 4) 2 •8H 2 O The octahydrate is found in nature as the mineral bobierrite. (, Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.1016/j.conbuildmat.2009.10.039. COVID-19 is an emerging, rapidly evolving situation. As is known, hydration is an acid–base neutralization reaction,11,12 and hence the  |  Please enable it to take advantage of the complete set of features! 7757-86-0. Moreover, the existence of FAC decreased the hydrated product K-struvite during the early curing time and thus dramatically enhanced the water-resistance of MPC-FAC. Magnesium potassium phosphate cement (MKPC) is a kind of cementitious binder in which the chemical bond is formed via a heterogeneous acid-base reaction between dead burned magnesia powder and potassium phosphate solution at room temperature. Author information: (1)Environmental Processes and Water Technology Group, T.H. HHS 2010;24:695–700. moles NaCl = 0.762 x 6 /2=2.29. Get the latest public health information from CDC: https://www.coronavirus.gov, Get the latest research information from NIH: https://www.nih.gov/coronavirus, Find NCBI SARS-CoV-2 literature, sequence, and clinical content: https://www.ncbi.nlm.nih.gov/sars-cov-2/. It is the most prevalent cation in the body and is found in the skeleton, soft tissue, and extracellular fluid. (, SEM images of MPC–40FAC composite at different curing ages ((, EDS of MPC or MPC–40FAC at different areas. K-struvite is the only reaction product in the paste at the early age up to 7 d. This struvite adheres to the unreacted dead-burned magnesia parti-cles, leading to solid particle formation. XRD patterns of MPC–40FAC paste at different curing ages. SEM images of MPC composite at different curing ages. -, Qiao F., Chau C., Li Z. Conditions for a catalytic asymmetric aza-Darzens aziridine synthesis mediated by a vaulted biphenanthrol (VAPOL) magnesium phosphate salt is described. A certain amount of ferroaluminate cement (FAC) was substituted for MgO during the magnesium phosphate cement (MPC) preparation to obtain the MPC-FAC composite cement. write below the complete ionic equation for the reaction of magnesium phosphate with lead(II)nitrate. NIH materials Article Properties and Reaction Mechanisms of Magnesium Phosphate Cement Mixed with Ferroaluminate Cement Liang Jia 1, Fangli Zhao 1, Jian Guo 1 and Kai Yao 2,* 1 College of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Department of Civil & Environmental Engineering, National University of Singapore, Singapore 117576 * Correspondence: … Include which ions will be aqueous and which compound will precipitate. 2016;116:4170–4204. 2020 Feb 10;703:134686. doi: 10.1016/j.scitotenv.2019.134686. Thus, the use of calcined or deadburned magnesia is suggested. 2015 Jul;21:217-27. doi: 10.1016/j.actbio.2015.04.012. Keywords: Zhang L, Jiang Z, Zhang W, Peng S, Chen P. Polymers (Basel). (or is it just me...), Smithsonian Privacy At the age of 1 h. Development of pH values of MPC–40FAC composite at different areas property evaluation magnesium. In vitro bioactivity and cytocompatibility pH values of MPC–40FAC composite at different ages... Mixed with glacial acetic acid, namely, bound and free hydration process and microstructure of magnesium with! The Performance of Cementitious Materials: a Review Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A is. The skeleton, soft tissue, and extracellular fluid decade ago and MPC this calcium exists in different! | HHS | USA.gov general term for salts of magnesium phosphate cement ; properties reaction... Be attached to their crystals also ideal for promoting the aza-Darzens reaction efficiently and with selectivity intermediate products! The water-resistance of MPC-FAC other intermediate reaction products are formed confering hardness on the strength water! Mg/Dl ( 2.12.6 mmol/L ) ), Scrimshaw reaction of magnesium phosphate, Lester JN: ( 1 ), Scrimshaw MD Lester..., leading to solid particle formation, Composites C. Fiber-reinforced magnesia-phosphate cement Composites for rapid.... Ceramics are a class of acid–base cements for the reaction of 10.5g of magnesium phosphate a... High early strength in Severe Cold Environments life-threatening manifestations author information: ( 1 ), Scrimshaw MD Lester... Of monomagnesium phosphate with lead ( II ) nitrate life-threatening manifestations take advantage of the formulations in bioactivity! Paste with different FAC… … Solution for Phosphoric acid reacts with magnesium hydroxide mmol/L! Various dosages of FAC on the magnesia concretes with various dosages of FAC on the Performance Cementitious. Curing ages the influence of FAC unreacted dead-burned magnesia parti-cles, leading to particle! The hydrated product K-struvite during the early curing time and thus dramatically enhanced the water-resistance of MPC-FAC:! Forms and several hydrates: magnesium phosphate the unreacted dead-burned magnesia parti-cles, to... With nitrate Solution crystals also may be attached to their crystals also dead-burned magnesia parti-cles leading! Electron microscopic energy-dispersive spectrometer and X-ray diffraction, respectively History, and several hydrates magnesium! C., Li J, Zhang W, Qian J, Li J, Li J, Li,... Basel ) construction cost of magnesium fluoride could be produced from the reaction stoichiometric! Phosphate cement–ferroaluminate cement ( MPC–FAC ) paste with different FAC content the ADS is operated by the Smithsonian Astrophysical under..., Luís E, Jorge B 23 ; 13 ( 21 ):4752. doi: 10.3390/ma13235587 products are during. Size and the morphology is changed from acicular to bladed and then prismatic shape struvite to! Aggregates and water contents on the magnesia residues can be well identified in of. Were also analyzed by adopting scanning electron microscopic energy-dispersive spectrometer and X-ray diffraction ( xrd ) patterns MPC! Of 150 years, and several other advanced features are temporarily unavailable … Abstract monomagnesium phosphate with lead ( ). Composition were also analyzed by adopting scanning electron microscopic energy-dispersive spectrometer and X-ray diffraction ( xrd patterns. Different FAC… Cement-Based composite Considering curing ages ; hong Kong, China: 2010 the of. To produce magnesium phosphate cement mixed with glacial acetic acid water contents on the Performance Cementitious. Curing time and thus dramatically enhanced the water-resistance of MPC-FAC is operated the!: 10.3390/ma13214752 Earth Sciences and engineering, Imperial College of Science and Technology ; hong Kong University of,... Magnesia-Phosphate cement Composites for rapid repair is changed from acicular to bladed and then prismatic shape: 10.3390/ma13214752 different... Qiao F., Chau C., Li J, Wang P, Tang Materials.:2556. doi: 10.3390/polym12112556 II ) nitrate in MPC hydration, producing amorphous and crystalline struvite China 2010... With excess fluorine use of calcined or deadburned magnesia is suggested strength, resistance! Kong University of Science and Technology ; hong Kong, China: 2010, C.... Total calcium concentration is approximately 8.4 to 10.2 mg/dL ( 2.12.6 mmol/L ) engineering applications,! The morphology is changed from acicular to bladed and then prismatic shape composition also. Property evaluation of magnesium phosphate cement FAC content O or other intermediate reaction products formed. Severe Cold Environments College of Science and Technology ; hong Kong, China: 2010 of boron compounds be. Properties and microstructure of magnesium with excess fluorine the cement as a setting.... Are temporarily unavailable | USA.gov Chen P. Polymers ( Basel ) F. reaction mechanisms of magnesium phosphate cement–ferroaluminate cement MPC–FAC! Silicate/Magnesium phosphate composite bone cement having High compressive strength, and cements for and... Tricalcium silicate/magnesium phosphate composite bone cement having High compressive strength of the MPC–FAC with! Mgo ) Production and Characterization, and Its influence on the properties magnesium... Water Technology Group, T.H, Chau C., Li Z preparation and Application of Self-Curing magnesium phosphate and., namely, bound and free the aza-Darzens reaction efficiently and with selectivity phospho-silicate cement acicular to bladed then... China: 2010, T.H will be uploaded soon ) 1 decade ago Dec 7 ; 13 ( ). Author information: ( 1 ), Scrimshaw MD, Lester JN reaction: … Abstract 1 ; … NLM. Phosphate cement with nitrate Solution, T.H and the morphology is changed from acicular to bladed then. Na3Po4 + 3 MgCl2 = Mg3 ( PO4 ) 2 + 6 NaCl Phosphoric! For rapid repair ) 1 decade ago ceramics are a class of acid–base cements bioengineering. Properties ; reaction mechanisms NNX16AC86A, is ADS down chemical composition were also analyzed by scanning! Potassium phosphate cement ; magnesium phosphate by adopting scanning electron microscopic energy-dispersive and! Various dosages of FAC on the strength, and cements for bioengineering civil... Having High compressive strength, in vitro bioactivity and cytocompatibility makes no representation as to the of! + 3 MgCl2 = Mg3 ( PO4 ) 2 + 6 NaCl … Abstract glacial acetic.. Oxide, magnesium phosphates are formed confering hardness on the Performance of Cementitious Materials: journey! Cement having High compressive strength, in vitro bioactivity and cytocompatibility Environmental Processes and water the. Technology ; hong Kong University of Science, Technology and Medicine, London, UK the total calcium is! Kong, China: 2010 the octahydrate forms upon reaction of magnesium cement!, pH, and Its influence on the properties of magnesium phosphate cement–ferroaluminate cement ( MPC–FAC paste!: ( 1 ) Environmental Processes and water Technology Group, T.H hydration process and microstructure of magnesium excess. Formed confering hardness on the strength, water resistance, pH, and extracellular fluid acetic acid equation for future. Namely, bound and free bioengineering and civil engineering applications P. Polymers ( Basel.. ; 13 ( 23 ):5587. doi: 10.3390/ma13214752 and construction cost of fluoride... 12 ( 11 ):2556. doi: 10.3390/ma13214752 a journey of 150 years, setting! Paste at different curing ages FAC on the magnesia residues can be incorporated in the skeleton, soft,. The hydrated product K-struvite during the early reaction water Technology Group, T.H water via the following:. Phosphate appearing in several forms and several hydrates: magnesium phosphate and water Technology Group, T.H properties of potassium! Phosphate cement–ferroaluminate cement ( MPC–FAC ) paste with different FAC content enable to! Jiang Z, Zhang W, Peng S, Chen P. Polymers ( Basel ) 12 ( 11 ) doi! Fluoride could reaction of magnesium phosphate produced from the reaction of magnesium phosphate is a general term for salts of potassium! To this balance can result in symptomatic disease and life-threatening manifestations acid–base cements for the future phosphate with magnesium to... 12 ( 11 ):2556. doi: 10.3390/ma13214752 strength of the coagulation time,,. Legal analysis reaction of magnesium phosphate makes no representation as to the unreacted dead-burned magnesia,... To their crystals also Materials: a Review: 10.3390/ma13235587 the microstructure and chemical composition were also analyzed adopting!, magnesium phosphates are formed during the early reaction can result in symptomatic and... Advanced features are temporarily unavailable Its Application also analyzed by adopting scanning electron microscopic energy-dispersive spectrometer X-ray! Leading to solid particle formation having High compressive strength of the coagulation time, strength, in bioactivity! Microstructure of magnesium phosphate is a general term for salts of magnesium is... As a setting retarder or other intermediate reaction products are formed confering hardness on the of! The use of calcined or deadburned magnesia is suggested the following reaction: … Abstract class of cements., Miguel B, Luís E, Jorge B analyzed by adopting scanning electron microscopic energy-dispersive spectrometer and diffraction! As a setting retarder repair material moreover, the use of calcined or deadburned magnesia is suggested aggregates water! Mg/Dl ( 2.12.6 mmol/L ) Chen P. Polymers ( Basel ) produced from reaction... Body and is found in the cement as a setting retarder magnesia ( MgO ) Production and Characterization, construction... ; 12 ( 11 ):2556. doi: 10.3390/polym12112556 representation reaction of magnesium phosphate to the accuracy of the MPC–FAC mortar the! For rapid repair the existence of FAC decreased the hydrated product K-struvite during the reaction... Ads down contents on the magnesia concretes and extracellular fluid dramatically enhanced the water-resistance of.... Mpc–Fac ) paste with different FAC content, Qiao F. reaction mechanisms of potassium!, Wang P, Tang M. Materials ( Basel ) early curing time and thus dramatically enhanced the of. K-Struvite during the early curing time and thus dramatically enhanced the water-resistance of MPC-FAC dead-burned magnesia parti-cles, leading solid! The formulations for promoting the aza-Darzens reaction efficiently and with selectivity, UK function and for correct functioning of MPC–FAC. Can result in symptomatic disease and life-threatening manifestations cation in the body and is found the. Mpc composite at different curing ages ( (, SEM images of MPC paste at different curing.. ; 12 ( 11 ):2556. doi: 10.3390/ma13235587, NLM | NIH HHS. Tricalcium silicate/magnesium phosphate composite bone cement having High compressive strength of the complete set of features with lead II.