Identification of Freshwater Diatoms from Live Material
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Experimental hepatic dysfunction: Evaluation by MRI with Gd‐EOB‐DTPA
To investigate the potential of gadolinium (Gd)-ethoxybenzyl (EOB)-diethylenetriamine-pentaacetic acid (DTPA) for evaluating liver function, chemically induced hepatitis animal models were studied. The rats in group 1 underwent intraperitoneal administration of 2.0 ml/kg and those in group 2 underwent intraperitoneal…
Stability of the bcc phase of Cu-Al-Mn shape-memory alloys
Measurements of the entropy change at the martensitic transition of two composition-related sets of Cu-Al-Mn shape-memory alloys are reported. It is found that most of the entropy change has a vibrational origin, and depends only on the particular close-packed structure of the low-temperature phase. Using data from th…
Enzymatic Synthesis and Characterization of a Novel Water-Soluble Polyaniline: Poly(2,5-diaminobenzenesulfonate)
A novel water-soluble polyaniline has been synthesized by horseradish peroxidase catalyzed oxidative free-radical coupling of 2,5-diaminobenzenesulfonate. The polymerization reaction is rapid, and the average molecular weight of the resulting polymer is on the order of 18 000. Unlike the sulfonated polyanilines synthe…
Spin Crossover in Novel Dihydrobis(1-pyrazolyl)borate [H2B(pz)2]-Containing Iron(II) Complexes. Synthesis, X-ray Structure, and Magnetic Properties of [FeL{H2B(pz)2}2] (L = 1,10-Phenanthroline and 2,2‘-Bipyridine)
The first example of spin crossover iron(II) complexes based on dihydrobis(1-pyrazolyl)borate are presented here. The complexes {Fe[H(2)B(Pz)(2)](2)(phen)} (phen = 1,10-phenanthroline), 1, and {Fe[H(2)B(Pz)(2)](2)(bipy)} (bipy = 2,2'-bipyridine), 2, have been synthesized and their structures determined by X-ray diffra…
Anharmonic correlated Einstein-model Debye-Waller factors
An anharmonic correlated Einstein model is derived for local vibrational amplitudes in x-ray-absorption fine structure (XAFS) that takes into account all near neighbors of absorber and backscattering atoms. The model is based on quantum thermodynamic perturbation theory and includes anharmonic effects based on empiric…
Quantitative Comparison of Five SERS Substrates: Sensitivity and Limit of Detection
Five surface-enhanced Raman scattering (SERS) substrates were quantitatively compared for ease of preparation, sensitivity, limit of detection (LOD), reproducibility, and stability. Specifically, vapor-deposited Ag films, electrochemically roughened Ag electrodes, nitric acid-etched Ag foil, Tollens-produced Ag films,…
Magnetic Iron Oxide Particles Coated with Carboxydextran for Parenteral Administration and Liver Contrasting
RATIONALE AND OBJECTIVES: To evaluate the physical and pharmacological profiles of SH U555A, a suspension of magnetic iron oxide particles that is designed to enhance the visualization of liver tumors and metastases. MATERIAL AND METHODS: Chemical and physical methods were used to characterize the size and structure o…
LATOSSOLOS DO BRASIL: UMA REVISÃO
This paper presents a review on Latosols (oxisols) genesis, classification and use in tropical Brazil.Chemical, physical and mineralogical aspects are throughly discussed, as well as their relationship withsoil use and management. Some problems of definition are considered for all types of Latosols recognizedin the Br…
On the Stability of Carboxylic Acid Derivatized Gold Colloidal Particles: The Role of Colloidal Solution pH Studied by Optical Absorption Spectroscopy
Results of an investigation into the influence of hydrosol pH on the optical properties of gold colloidal particles capped with a novel aromatic bifunctional molecule, 4-carboxythiophenol (4-CTP), are presented. Changes in the optical properties of the carboxylic acid derivatized clusters have been interpreted as aris…
Disequilibrium for Ca during growth of pelitic garnet
Compositional zoning in hundreds of almandine‐rich garnets in amphibolite by facies micaceous quartzites from the Picuris Range, north‐central New Mexico USA, indicates that although Mn, Mg and Fe achieve chemical equilibrium at hand‐sample scale during garnet growth, Ca does not. Instead, Ca concentrations at the sur…
Polymeric implants for cancer chemotherapy
Cancer chemotherapy is not always effective. Difficulties in drug delivery to the tumor, drug toxicity to normal tissues, and drug stability in the body contribute to this problem. Polymeric materials provide an alternate means for delivering chemotherapeutic agents. When anticancer drugs are encapsulated in polymers,…
EXAFS Debye–Waller Factor and Thermal Vibrations of Crystals
The EXAFS Debye-Waller factor depends on the correlation of atomic motion and can yield original information on the vibrational dynamics of crystalline solids. In this paper an introductory treatment of thermal disorder in EXAFS, based on thc cumulant approach, is given. Thc general relation between mean-square relati…
Transport Properties of Bi2S3 and the Ternary Bismuth Sulfides KBi6.33S10 and K2Bi8S13
We have studied transport properties (resistivity, Hall effect, thermopower, and thermal conductivity) of Bi 2 S 3 and two new ternary bismuth sulfides, KBi 6.33 S 10 and K 2 Bi 8 S 13, to explore their potential for thermoelectric applications. While both Bi 2 S 3 and K 2 Bi 8 S 13 display an essentially metallic con…
Processing and cell morphology relationships for microcellular foamed PVC/wood‐fiber composites
Abstract In this research, the effects of the materials and the processing conditions on the cell morphology of foamed PVC/wood‐fiber composites were studied with a view to establishing their process‐structure relationships. Each step of microcellular PVC/wood‐fiber composites processing is addressed, including the su…
Improved formulation of the coupled-wave method for two-dimensional gratings
A new formulation of the coupled-wave method for two-dimensional gratings is proposed. It is based on mathematical and physical results recently obtained for one-dimensional gratings. Numerical evidence obtained for many different diffraction problems, including dielectric, metallic, volume, and surface-relief grating…
New Technique for Synthesizing Iron Ferrite Magnetic Nanosized Particles
Ferrous dodecyl sulfate, Fe(DS) 2, micellar solution was used to make nanosized magnetic particles whose size is controlled by the surfactant concentration and by temperature. The average particle size varies from 3.7 to 11.6 nm, with a standard deviation ranging from 0.22 to 0.34. In contrast to what is obtained in h…
Angular and Distance Dependence of the Magnetic Properties of Oxo-Bridged Iron(III) Dimers
The magnetic properties of oxo-bridged oxo-(carboxylato)-bridged and oxo-bis(carboxylato)-bridged iron(III) dimers are found to depend on the iron−(μ-O) distance as well as on the iron−(μ-O)−iron angle. With an angular and radial overlap model we account for both these dependencies. The use of an angular overlap model…
Aromatic Poly(1, 3, 4‐Oxadiazoe)s as Advanced materials
The specialized‐performance polymers poly(arylene‐1,3‐oxadiazole)s —see Figure for an example—have high‐value end uses based on their electronic, optical, and thermal properties. The syntheses, solid‐state structure, properties, and applications of poly(arylene‐1,3,4‐oxadiazole)s are reviewed. magnified image
Preparation of Pd−Pt Bimetallic Colloids with Controllable Core/Shell Structures
Polymer-protected Pd−Pt bimetallic colloids in the size range 1.5−5.5 nm with controllable core/shell structures have been successfully prepared by a so-called hydrogen-sacrificial protective strategy. The obtained bimetallic colloids were characterized by transmission electron microscopy and infrared carbon monoxide…