Beta-iron

The NH4-Beta-300 (Zeolyst International, number denote Si02/Al203 molar ratio) was transformed to corresponding proton form using a step calcination procedure at 500 °C. H-Beta-300 was partially modified with Fe by repeated ion-exchange method (Fe(III)nitrate). The surface areas as well as acidities (Bronsted and Lewis acid sites) of Fe-Beta (iron content - 0.1 wt %) were determined by nitrogen adsorption and pyridine desorption at 250, 350 and 450 °C using FTIR spectroscopy [6]. 

Chen, W. J., D. P. Lin, and 1. P. Hsu (1998). Contrihution of electrostatic interaction to the dynamic stability coefficient for coagulation-flocculation kinetics of beta-iron oxy-hydroxides in polyelectrolyte solutions. J. Chem. Eng. Japan. 31, 5, 722-733. 

Andrault D., Piquet G., Charpin T., and Bihan T. L. (2000) Structure analysis and stability field of beta-iron at high P and T. Am. Mineral. 85, 364-371. 

Beta-iron (P-Fe). When heated above its Curie temperature of 769 C, alpha-iron loses its ferromagnetic properties but retains its body-centered cubic structure (i.e., second-order transition). This particular form of iron is called beta-iron, which is considered a different allotropic form owing to its paramagnetic properties. However, because no changes in the crystal lattice structure occurs, it is customary to consider it nonmagnetic alpha-iron ... 

Beta-ferrite (P-ferrite, bcc). Like alpha-ferrite, beta-ferrite consists of a solid solution of any element in body-centered cubic beta iron. 

Well Benzene Cadmi urn (U) Co Coliform Gross beta Iron (U/F) Manganese (U/F) Nitrate Low/High pH Ru Spec. cond. Sulfate Sr Tritiin... 

Chemical Reactivity - Reactivity with Water No reaction Reactivity with Common Materials No reactions Stability During Transport Stable Neutralizing Agents for Acids and Caustics Not pertinent Polymerization Polymerization is accelerated by heat and exposure to oxygen, as well as the presence of contamination such as iron rust. Iron surfaces should be treated with an appropriate reducing agent such as sodium nitrate, before being placed into isoprene service Inhibitor of Polymerization Tertiary butyl catechol (0.06 %). Di-n-butylamine, phenyl-beta-naphthylamine andphenyl-alpha-naphthylamine are also recommended. 

Zeimer, R, Belkin, M., Leitersdorff, E. and Rachmilewitz, E.A. (1978). A non-invasive method for the evaluation of tissue iron deposition in beta-thalassemia major. J. Lab. Clin. Med. 91, 24-31. 

Carvediol is a vasodilator with beta-adrenergic antagonist activity. It has cardioprotective activity in animal models. The antioxidant effect of carvediol was compared with five other beta blockers in iron-initiated lipid peroxidation, where it inhibited TBARs formation and protected membrane-bound tocopherol in rat brain homogenate (Yue et al., 1992a). The ortJ <)-substituted phenoxylethyl-amine is responsible for the improved antioxidant activity. 

Early measurements of " Th were on seawater samples and Th was co-precipitated from 20-30 L of seawater with iron hydroxide (Bhat et al. 1969). This procedure may not recover all of the " Th in the sample, and an alpha emitting Th isotope (e g., °Th or Th) is added as a yield monitor. Following chemical purification of the Th fraction by ion exchange chromatography, the Th is electrodeposited onto platinum or stainless steel planchets. The planchets are then counted in a low background gas-flow beta detector to measure the beta activity and subsequently with a silicon surface barrier detector to determine the alpha activity of the yield monitor. The " Th activity is thus determined as ... 

Copper is part of several essential enzymes including tyrosinase (melanin production), dopamine beta-hydroxylase (catecholamine production), copper-zinc superoxide dismutase (free radical detoxification), and cytochrome oxidase and ceruloplasmin (iron conversion) (Aaseth and Norseth 1986). All terrestrial animals contain copper as a constituent of cytochrome c oxidase, monophenol oxidase, plasma monoamine oxidase, and copper protein complexes (Schroeder et al. 1966). Excess copper causes a variety of toxic effects, including altered permeability of cellular membranes. The primary target for free cupric ions in the cellular membranes are thiol groups that reduce cupric (Cu+2) to cuprous (Cu+1) upon simultaneous oxidation to disulfides in the membrane. Cuprous ions are reoxidized to Cu+2 in the presence of molecular oxygen molecular oxygen is thereby converted to the toxic superoxide radical O2, which induces lipoperoxidation (Aaseth and Norseth 1986). 

Seefeldt, E. C. and Arp, D. J. (1986) Purification to homogeneity of Azotobacter vinelandii hydrogenase A nickel and iron containing alpha beta dimmer. Biochimie, 68, 25-34. 

Reaction of iron(II) chloride with the carbothioamide derivative of bipy, beta (200), gave three compounds, [Fe(bcta)2]Cl2 H20, [Fe(bcta)2][FeCl4], and [Fe(bcta)2]2[Cl3Fe0FeCl3]Cl2 3H20. This last compound contains low-spin Fe and high-spin Fe its Mossbauer spectrum exhibits an unusual temperature dependence." ... 

Biliary excretion As most entacapone excretion is via the bile, exercise caution when drugs known to interfere with biliary excretion, glucuronidation, and intestinal beta-glucuronidase are given concurrently with entacapone (see Drug Interactions). Lab test abnormalities Entacapone is an iron chelator. The impact of entacapone on the body s iron stores is unknown however, a tendency towards decreasing serum iron concentrations was noted in clinical trials. In a controlled clinical study, serum ferritin levels (as a marker of iron deficiency and subclinical anemia) were not P.764... 

Ferrisilicate zeolites wherein iron ions replace silicon in the lattice framework have potential as catalyst in various conversion processes. During the past decade ferrisilicate analogs of sodallte, MFI, M, MTT, EUO, MTW, FAU, BETA, MOR and LTL have been synthesised and characterised by various physicochemical techniques as well as catalytic reactions. After a review of the general synthesis procedures a list of criteria is presented to confirm the location of Fe in the zeolite framework. Examples are provided to illustrate the utility of the various characterisation techniques. 

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