Stacy Siegel

Centenary University · Business

Thirty patients were skin tested by Multi-Test and Morrow Brown needle using antigens, histamine, glycerosaline, and blank controls to examine reproducibility and influence of positive reactions on adjacent negative controls. There was no evidence that histamine or strongly positive antigen reactions affected adjacent negative controls. Multi-Test...

Between December 1989 and June 1990, 1,874 reports of alleged malathion application related illness from repeated spraying of a mixture of malathion corn syrup bait to eradicate a Mediterranean fruit fly infestation in Southern California were received by the Toxics Epidemiology Program of Los Angeles County. Among these complaints were 47 reports...

The bronchodilator effect of terfenadine, 60-mg or 120-mg single dose, and 1 week twice daily dosing, was evaluated in 12 allergic asthmatic patients. When compared with baseline, FEV1 rose significantly for single dose 120 mg terfenadine at one, one and one-half, three, five and one-half, and six hours and for 60 mg terfenadine at three, five and...

In a four-week study, 20 children with chronic asthma were treated in a randomized, double-blind, crossover manner with two sustained-release theophylline preparations (Theo-Dur and Uniphyl) to compare their drug concentrations and clinical efficacy. In addition, the effects of serum theophylline concentration on results of pulmonary function tests...

There is evidence that theophylline therapy inhibits lower esophageal sphincter pressure and enhances gastroesophageal reflux in normal adults and adult asthmatics. No studies have used intraesophageal pH monitoring to assess the effect of bronchodilators over prolonged periods. With the use of the latter procedure, we studied 10 randomly selected...

X-ray powder diffraction analysis was used to characterize submicrometer aerosol samples collected using a modified Lundgren cascade impactor. The Debye-Scherrer method was found to be particularly convenient, for the particles could be easily transferred to an X-ray capillary which could then be sealed to limit chemical changes. Several sets of ae...

Bis(..mu..-acetato)-bis(norbornadiene)dirhodium(I) has been structurally characterized. The compound has been shown to be an active catalyst for the isomerization of quadricyclane to norbornadiene. This material crystallizes in the centrosymmetric monoclinic space group P2/sub 1//c with unit cell constants (T = 20/sup 0/C) a = 9.7733 (10) A, b = 15...

A kinetic, morphological, and structural study has been made of the half-calcination process in BCR 1337 dolomite stones. The investigation covered the temperature range 640 to 800/sup 0/C in 40% CO/sub 2/ to 60% He and 100% CO/sub 2/ at 1-atm pressure. Certain morphological features which can have a bearing on subsequent sulfation kinetics have be...

The effects of beclomethasone, dipropionate aerosol (DBA) (400 microgram/day) on clinical course, pulmonary function, and pituitary-adrenal function was studied in 34 steroid-dependent asthmatic children. Asthma severity was assessed by daily symptom and medication scores, peak flow measured three times a day, and weekly spirometry. Pituitary-adren...

In the course of investigations on the kinetics of sulfation of natural dolomite, CaMg(COâ)â, as the sorbent for SOâ, it has been found that Mg ions can be made to sulfate, leading to the formation of a double salt, MgâCa(SOâ)â. This compound also forms when synthetic dolomites are used in sulfation experiments. In sulfur emissions control processe...

In the course of investigations on the kinetics of sulfation of natural dolomite, CaMg(CO/sub 3/)/sub 2/, as the sorbent for SO/sub 2/, it has been found that Mg ions can be made to sulfate, leading to the formation of a double salt, Mg/sub 3/Ca(SO/sub 4/)/sub 4/. This compound also forms when synthetic dolomites are used in sulfation experiments....

The chemistry of airborne particulate matter is being investigated by means of laboratory and field studies. Experiments were conducted using the flow reactor to identify the reaction conditions under which detectable amounts of sulfate particles could be formed from gaseous sulfur dioxide. A procedure was developed for the analysis of acidic and n...

Possible regeneration mechanisms for sulfated dolomite or limestone are presented. Preliminary test results are encouraging, however, the actual reaction mechanism has not yet been established. It may involve gas-solid interactions as intermediate steps, with the overall process represented by the solid-solid reaction: 3CaSO/sub 4/ + CaS yields 4Ca...

Die Struktur von K3Pr2 (NO3)9 wird röntgenographisch ermittelt.

The uranium trioxide-water system has been investigated in detail. The compounds prepared are UO3. 2H2O, UO3. 0·8H2O, α,β and γ UO2(OH)2 and U3O8(OH)2. The deuterated forms of these phases were also studied. Each of the compounds was characterized by X-ray diffraction, i.r., Raman and thermoanalytical methods.

Anhydrous double nitrates of the lanthanides with potassium have been obtained in crystalline form. Crystallographic and spectroscopic studies are reported. K3Pr2(NO3)9 is cubic, with a = 13.52 (1) Å and space group O6-P4332. The experimental density is 2.53 (3) g cm-3 and the computed value is 2.57 (1) g cm-3 for four formula weights. The structur...

Cr2UO6 has been prepared hydrothermally by the reaction of uranium trioxide with a chromium(III) nitrate solution at 325–425°C. The crystal symmetry is hexagonal, space group , with a = 4·988[1] and . The i.r. spectrum is shown to be in accord with predictions of factor group analysis. Thermal analysis indicates that Cr2UO6 is stable in air to 950°...

Die durch Auflösen des Alanins (I) in Wasser und Zugabe von Ni-carbonat dargestellten L- und DL-Alaninato-Komplexe (II) wurden röntgenographisch, thermogravimetrisch und IR-spektroskopisch untersucht.

Phase relationships existing in the uranium-oxygen system at temperatures to 1600°C and pressures to 60 kb are reported. The compounds identified in the system include UO2, U4O9, U16O37, U8O19, U2O5 and UO3. Properties of new phases have been studied by X-ray diffraction, thermal and i.r. analysis. Temperature and pressure stability ranges for thre...

Alkali metal or alkaline earth metal carbonates such as calcium carbonate and magnesium carbonate found in dolomite or limestone are employed for removal of sulfur dioxide from combustion exhaust gases. The sulfated carbonates are regenerated to oxides through use of a solid-solid reaction, particularly calcium sulfide with calcium sulfate to form...

Results of investigations on the uranium-oxygen sysstems are presented. ; A survey of recent publications is included in order to present a complete ; picture of current work in this field. Studies of the structure of UâO/sub ; 9/ indicate that the oxide may not crystallize in the simple fluorite lattice ; which has been geneally accepted for this...

Results are presented on a basic research program which correlates chemical kinetic measurements with structural and morphological changes occurring in solid particles during chemical reactions associated with the cyclic use of dolomite in sulfur emission control processes. Results are reported on studies of the sulfation reaction, half-calcination...

β-PtO2 crystallizes as the orthorhombic CaCl2-type structure with , , and . The oxygen coordinates are found to be: x= 0·281 and y = 0·348. This leads to two long PtO bonds of 2·02 Å, four short bonds of 1·98 Å, and a mininum oxygen-oxygen approach of 2·40 Å. The Pt(IV) radius is 0·63 Å. A comparison of the PtO2 structure with the rutile form of T...

Experiments at high pressure have established the existence of the compound UO2·37±0·02. Its crystal symmetry is monoclinic and the cell parameters are and β = 90·29°. The compound has been prepared from mixtures of UO2 and U3O8 at 30–40 kbars and 500–1400°C. The measured density of UO2·37 is 11·34 g/cm3. The i.r. spectrum is shown to resemble that...

The double oxide Tl2Pt2O7 has been prepared by reaction of Tl2O3 with platinum metal or PtO2 at 1000° and 40 kbars pressure. The brown solid is insoluble in aqua regia and is thermally stable to 750° at atmospheric pressure. The cell is face-centered cubic with a = 10.132 ± 0.004 A and the structure is assumed to be of the cubic pyrochlore type bas...

Preparative methods for five crystalline modifications and an amorphous form of uranium trioxide are described. Some properties of the UO3 phases are discussed, including the density, crystal structure, heat of solution, thermal stability and infra-red spectrum. Data on the UO2·9 phase are also given.

Preparative methods for five crystalline modifications and an amorphous form of uranium trioxide are described. Some properties of the UO/sub 3/ phases are discussed, including the density, crystal structure, heat of solution, thermal stability and infra-red spectrum. Data on the UO/sub 2/ /sub .9/ phase are also given. (auth)

The low temperature oxidation of UO2 to U3O7 is shown to be a diffusion-controlled diphasic reaction. Two tetragonal phases of U3O7 have been identified: α-U3O7, with , and β-U3O7 with . Annealing experiments with β-U3O7 show the existence of a third tetragonal phase with a composition approximately UO2·3, which is stable to 500°C. Its parameters a...

Investigations under way on the uranium-oxygen system in the composition range UO2.5 to U2O5 indicate that U2O5 does not exist; UO2.56 represents the lower limit of the monophasio region below U3O8. Composition limits of the orthorhombic UO2.6 phase appear to be UO2.56 to UO2.65- Transition to the U3O8 phase occurs above the composition UO2.65. Sin...