Black, Fisher

Cold-seal stellite bombs and high oxygen pressures were used as described previously (6, 7, 8, 9, 10). An ordinary pot furnace was used for heat treatments carried out in air. As starting materials, purified palladium black (Fisher Scientific Co.) was mixed intimately with the other oxides or hydroxides [PbO, Sr(OH)2 8H20, CaO, CdO, Mg(OH)2]. The mixtures generally were inserted into gold foils and heat treated under various conditions of temperature and oxygen pressure. The runs were quenched and the products examined by x-ray diffraction. 

Viscosities of concentrated suspensions of carbon black in a white mineral oil (Fisher "paraffin" oil of 125/135 Saybolt viscosity) were measured with a Brookfield viscometer as a function of OLOA-1200 content. Figure 13 shows the viscosities of dispersions with 30 w%, 35 w% and 70 w% carbon black. In all cases the viscosity fell rapidly as the 0L0A-1200 content increased from 0 to 1%, then fell more gradually and levelled off as the 0L0A-1200 content approached 2%. In many respects the reduction in viscosity with increasing OLOA-1200 content parallels the conductivity measurements both phenomena are sensing the buildup of the steric barrier, and this steric barrier weakens, softens, and lubricates the interparticle contacts. As evidenced in foregoing sections, the particles are still flocculated but can be easily stirred and separated mechanically. The onset of electrostatic repulsion at OLOA-1200 contents in excess of 2.5% did not affect viscosities. 

For a time, the question of the bacterial origin of these bodies was hotly debated. Hanks,208 from cytological evidence and the fact that such materials were confined to the leprosy bacillus and disappeared during sulfone therapy, persuasively reasoned that they originated in M. leprae. Moreover, since chloroform in aqueous systems declumped and dispersed M. leprae, he concluded that mycobacterial lipids were the major bonding substances in the electron-transparent material. Since the material of the capsule can be stained with Sudan Black B, Fisher and Barksdale209 and Nishiura et al.2 0 had concluded that the electron-transparent zone which surrounds M. leprae in vivo is lipid. 

The apparatus used for the in vitro dissolution studies consisted of a two-piece 1 L reaction kettle (Fisher Scientific Co. Cat. No. 11-847B). The top cover has four openings, three of which were stoppered and the center one left open for the stirrer shaft. The exterior of both the top and bottom pieces were painted black to allow use with light-sensitive drugs. Stirring was provided by a three-blade, polyethylene stirrer... 

Figure 4 Sulfur isotope summary for black shales from the Pierre Shale of the Cretaceous Western Interior, North America (Gautier, 1986, 1987), and the Jurassic Posidonienschiefer and Jet Rock (Raiswell et al., 1993). For comparison, the maximum fractionation observed in the Posidonienschiefer by Fisher and Hudson (1987) is also shown. The isotopically uniform and strongly S-depleted pyrites of the Jurassic shales and the Cretaceous Sharon Springs Member of the Pierre Shale—like the sediments of the modern Black Sea and Cariaco Basin (Figure 7)—are diagnostic of euxinic (water-column) pyrite formation (see Section 7.06.3.4.2). By contrast, the Cretaceous Gammon Shale shows the S enrichments and broad range of 6 S values possible under oxic depositional conditions (Gautier, 1986, 1987).

A reduction in erythrocyte superoxide dismutase activity was also seen in males receiving daily zinc supplements of 50 mg for 6 weeks (Fisher et al. 1984). Zinc supplementation has been shown to decrease HDL levels with daily doses of at least 50 mg zinc for 12 weeks (Black et al. 1988 ... 

In 1973, Myron Scholes and Fisher Black developed a model known as B S model for valuing options. Like the binomial tree, in the B S model the option value depends mainly on the price of the underlying asset, volatility, interest rate, time to expiration and dividend yield. Because in this chapter, we propose the value of a cOTivertible as the sum of the straight bond and call option, the... 

Fisher Black and Piotr Karasinski, Bond and Option Pricing When Short Rates Are Lognormal, Financial Analysts Journal (May-June 1991), pp. 52-59. 

Reagents. Poly(vinyl alcohol) (100 % hydrolyzed) with average molecular weight 14,000, cyanuric chloride (97%), fluoresceinamine isomer I and eriochrome black T (indicator grade) were purchased from Aldrich Chemical Co. Glutaraldehyde solution (50% (w/w) was obtained from Fisher Scientific. 

In 1976 Fisher Black presented a slightly modified version of the B-S model, using similar assumptions, for pricing forward contracts and interest rate options. Banks today employ this modified version, the Black model, to price swaptions and similar instruments in addition to bond and interest rate options, such as caps and floors. The bond options described in this section are options on bond futures contracts, just as the interest rate options are options on interest rate futures. 

In contrast to MPT, researchers of Goldman Sachs— Fisher Black and Robert Litterman—proposed a technique that tackles most of the problems, commonly associated to the classical portfolio optimization methods. They start the process of optimization with the assumption that investor chooses his optimum portfolio within a finite group of assets. In essence, the BL model turns the MPT on its head—it does not compute the optimal portfolio from the historical data, but rather assumes that a given portfolio in fact is the optimal one. This idea is backed by several researches which show that it is very difficult for investor to systematically outperform well-diversified benchmark. BL then derive the expected remrns for different positions in the portfolio. If investor agrees with the market assessment, benchmark becomes the optimal portfolio and the funds should be invested accordingly. On the other hand, if someone has different opinions about the expected returns of some of the stocks in the portfolio, the BL approach allows him to adjust the weights according to his projections. The result is the optimal portfolio, based on investor s individual assessment of market potential. 

Fisher A (1977) Contact dermatitis in black patients. Cutis 20 303-320... 

Machaerium scleroxylon) in a hobbyist handling the wood. Plants reported to cause erythema multiformelike eruption include poison ivy (Toxicodendron) (Schwartz and Downham 1981 Mallory et al. 1982), primula Primula obconica) (Hjorth 1966) and mug-wort (Artemesia vulgaris) (Kurz and Rapaport 1979). Mallory et al. (1982) reported urticarial eruptions with black deposits on the skin of four patients with Toxidocendron radicans dermatitis. Urticaria, erythema multiforme-like eruptions, in a patient from Rhus dermatitis was reported by Schwartz and Down-ham (1981). They recommended that patients with such reactions should be screened for systemic involvement as previous reports have shown that nephritis can be an associated feature (Meneghini and AngeUni 1981 Fisher 1986). 

Fisher A (1982) Leukoderma from bleaching creams containing 2% hydroquinone. Contact Dermatitis 8 272-273 Fisher A (1986) Acne venenata in black skin. Cutis 37 24-26 Fisher A (1994) Differential diagnosis of idiopathic vitiligo. Part III occupational leukoderma. Cutis 53 278-280 Fisher A (1995) Contact leukoderma (vitiligo) hyperpigmentation and discolorations from contactants. In Rietschel R, Fowler JJ (eds) Fisher s contact dermatitis, 4th edn. Williams Wilkins, Baltimore, pp 765-777... 

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