Method seeding

Method Seed latex Comonomers Functional group Reference... 

JONES, C. J. (1970) Design Methods Seeds of Human Futures (Wiley). 

Archeological records chronicle the ancient association of man with the plant genus Cannabis, of the plant family Cannabaceae. The use of cannabis fibers for the production of hemp has been dated to 4000 b.c. using carbon-14 methods. Seeds and pollen of the plant have been found in tombs, their leaves painted on funerary urns. The plant has been so well cultivated that a wild variant no longer exists. 

Experiment Methods. Seeds of each alfalfa variety were soaked in distilled water for 2 h, blotted dry with filter paper to remove excess water, and then respectively transferred to distilled water, 0.5 % NaCl and 1 % NaCl solution. Seeds were germinated in duplicate at 25 1 C. SL was measured at 2, 4, 24, 48, 72, 96, 120, and 144 h. The germination rate of alfalfa seeds were >95 % in the pre-experiment. SL was measured using a single photon monitor, Beckman-5801 (liquid scintillation counter) at constant temperature in the absence of light for 30 s. 

Jones, J. C. (1981), Design Methods Seeds of Human Factors, John Wiley Sons, New York. 

Cultivar Phytopatholog- Benzimidazole ical analysis of method seeds The rots of root The score... 

All Load-settlement All Finite difference method (Seed and Reese. 1957)... 

During the previous incarnation of long runs of cereals, one of the most difficirlt problems to overcome was that of the root disease take-all. This disease builds up in second, third and fourth wheats and then declines to manageable levels thereafter. Because it was soil-borne it was impossible to control other than by rotation and other cultural methods. Seed dressings are now available which can help to control take-all and this may lead to a revival of longer runs of wheat growing in the main arable areas, subject to CAP mles on diversification of cropping. 

Lonally, the templates were chosen by trial and error or exhaustive enumeration. A itafional method named ZEBEDDE (ZEolites By Evolutionary De novo DEsign) en developed to try to introduce some rationale into the selection of templates et al. 1996 Willock et al. 1997]. The templates are grown within the zeolite by an iterative inside-out approach, starting from a seed molecule. At each jn an action is randomly selected from a list that includes the addition of new (from a library of fragments), random translation or rotation, random bond rota-ing formation or energy minimisation of the template. A cost function based on erlap of van der Waals spheres is used to control the growth of the template ale ... 

Method 2. Place 0-2 g. of cupric acetate, 10 g. of ammonium nitrate, 21 2 g. of benzoin and 70 ml. of an 80 per cent, by volume acetic acid -water solution in a 250 ml. flask fitted with a reflux condenser. Heat the mixture with occasional shaking (1). When solution occurs, a vigorous evolution of nitrogen is observed. Reflux for 90 minutes, cool the solution, seed the solution with a crystal of benzil (2), and allow to stand for 1 hour. Filter at the pump and keep the mother liquor (3) wash well with water and dry (preferably in an oven at 60°). The resulting benzil has m.p. 94-95° and the m.p. is unaffected by recrystallisation from alcohol or from carbon tetrachloride (2 ml. per gram). Dilution of the mother liquor with the aqueous washings gives a further 1 Og. of benzil (4). 

Soluble analogues of these difunctional initiators have been prepared either by addition of small amounts of weakly basic additives such as triethylamine (73) or anisole (74) which have relatively minor effects on diene microstmcture (37). Another method to solubilize these initiators is to use a seeding technique, whereby small amounts of diene monomer are added to form a hydrocarbon-soluble, oligomeric dilithium-initiating species (69,75). 

In the most common production method, the semibatch process, about 10% of the preemulsified monomer is added to the deionised water in the reactor. A shot of initiator is added to the reactor to create the seed. Some manufacturers use master batches of seed to avoid variation in this step. Having set the number of particles in the pot, the remaining monomer and, in some cases, additional initiator are added over time. Typical feed times ate 1—4 h. Lengthening the feeds tempers heat generation and provides for uniform comonomer sequence distributions (67). Sometimes skewed monomer feeds are used to offset differences in monomer reactivity ratios. In some cases a second monomer charge is made to produce core—shell latices. At the end of the process pH adjustments are often made. The product is then pumped to a prefilter tank, filtered, and pumped to a post-filter tank where additional processing can occur. When the feed rate of monomer during semibatch production is very low, the reactor is said to be monomer starved. Under these... 

Precipitation. The precipitation of aluminum tribydroxide ia the recovery step of the Bayer process is achieved either by loweting the temperature or by diluting the pregnant Hquor and reduciag its pH. Both methods reverse the direction of equation 35, but seeding with previously precipitated crystals is required ia order to initiate nucleation. 

Tire usual commercial method of preparation of gibbsite is by cry staUization from a supersaturated caustic aluminate, Na A102, solution. Seed gibbsite crystals are used. 

Crystallization Method. Such methods as mechanical separation, preferential crystallisation, and substitution crystallisation procedures are included in this category. The preferential crystallisation method is the most popular. The general procedure is to inoculate a saturated solution of the racemic mixture with a seed of the desired enantiomer. Resolutions by this method have been reported for histidine (43), glutamic acid (44), DOPA (45), threonine (46), A/-acetyl phenylalanine (47), and others. In the case of glutamic acid, the method had been used for industrial manufacture (48). 

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