partially cationized cellulose for non-thrombogenic membrane in the presence of heparin and endothelial-cell-surface-heparansulfate (es-hs)

partially cationized cellulose derivatives (ds 0.01-0.1) have been synthesized by modification of cotton, cuprophan and cellulose dialysis membranes with 3-chloro-2-hydroxypropyltrimethyl-ammoniumchloride and used for the following studies: adsorption and desorption studies of heparin on partially cationized cellulose in nahco//3-solution..

electrochemical and sers studies of chemically modified electrodes. nile blue a, a mediator for nadh oxidation

the electrochemical and spectroscopic behavior of the phenoxazine-type mediator nile blue a adsorbed on glassy carbon (gc) and ag electrodes has been examined. the ph dependence of the formal redox potential and the ph dependence of the catalytic oxidation of nadh were found to be similar, although not exactly the same, on both types of e..

chemical celluloses derived from pinus radiata wood pulps for nitrocellulose preparation

the nitration capabilities of a range of chemical celluloses, including some containing the cellulose-ii polymorph, were examined the cellulose samples, derived from pinus radiata wood by bisulphite, prehydrolysis-kraft or kraft pulping, were compared with a commercial nitration-grade cellulose and two bleached cotton linters samples all ..

runoff and sediment yield from a flatland watershed in soybeans

runoff and sediment yield data from soybeans on a flatland watershed in the mississippi delta support results of earlier studies using cotton which conclude that soil erosion is a serious problem in this region. average annual sediment yield from a 15.6-ha mississippi delta watershed in conventional-till soybeans during a six-year (1979-1..

zone production system for cotton. soil response

in a three-year study, the major advantage of a zone cotton production system with controlled traffic was determined to be reduction in tractor operations for field preparation and crop management without a reduction in yield. the study indicates that tillage is required under any surface where wheels are operated to return the soil to a ..

delta paddle mixing impeller--some hydrodynamic studies

local measurements of the pressure difference across a 20 cm diameter delta impeller blade, and the pressure on the blade, have been carried out using a rotating manometer mounted on the shaft. the impeller was driven at speeds between 1.33 and 3.67 r.p.s. in a 30 cm square tank containing 27 l of water. the velocity field has been observ..

thermal behaviour of lignins from wasted black pulping liquors

the thermal degradation of lignins separated from black liquor waste from pulping of bagasse and cotton stalks has been investigated. thermal gravimetric analysis (tga), differential thermal analysis (dta) and derivative thermogravimetry (dtg), between 20 and 1000 $degree$ c, have been used. activation energies of treated lignins were cal..

study of risk-exposed cotton trading

the international spot-market, risk-exposed, trading of a cotton merchant was studied. a price model for estimating a market price for cotton with varying characteristics was constructed. this formed the input for a trading decision model which predicted the outcome of the merchant taking risky positions. (author abstract) 10 refs

effect of plant population densities and application of growth retardants on cottonseed yield and quality

in field trials at giza in 1986-1987, cotton cv. giza 75 was sown at 166,000, 222,000 and 333,000 plants/ha and given foliar applications of 0, 250, 500 and 750 ppm cycocel (chlormequat) or alar (daminozide). as plant density increased, there was a decrease in cottonseed yield/ha, seed index, seed protein content, oil and protein yields/h..

adsorptive gossypol removal

gossypol is extractable from cottonseed by using aqueous ethanol. the equilibrium between undissolved gossypol in cottonseed and that dissolved in the solvent determines the residual gossypol to move the equilibrium toward extraction from the seeds, the dissolved gossypol needs to be removed from the gossypol-solvent-oil mixture. gossypol..