Range alpha

Electrophysiological effects Extracts of hypericum were examined for their electrophysiological effects in animals. The onset of effects occurred 3-4 hours after administration. Frequencies affected first were in the alpha range and were maximal in the frontal cortex (Dimpfel and Hofmann 1995). Another study examined the EEG effects for two hypericum extracts in rats one extract high in hyperforin and lacking naphthodi-anthrones (C02), and another extract (LI 160) low in hyperforin. Both extracts showed similar early alpha effects, but only LI 160 had a late effect of increased delta frequencies. The alpha effects are comparable to... 

While this was happening, the nurse very carefully was following the instructions—and started at about three cycles, took it up to sixty and back and forth, and put it carefully in the middle of the "alpha range, and then the "theta range and "delta range, and then ended die experiment. 

A beam of 6-MeV alpha particles strikes a gold foil with thickness equal to one-third of the alpha range. What is the total energy loss of the alpha as it goes through this foil ... 

TJ Lin, T Akabori, S Tanaka, K Shimura. Low energy emulsification. Part III Emulsification in high alpha range. 

The normal EEG consists of waves in the alpha range of 8 - 13 Hz (a waves) and beta range of 13 - 25 Hz (P waves). Waves in the theta range of 4 - 8 Hz (9 waves) constimte a very minor component of the normal EEG and delta wave activity in the range of 1-4 Hz (8 waves) is absent. 

Enthalpy measurements of Dennison et al. (1966a) (373-1535 K in the alpha range) are given only in the form of equations and tabulated values with actual measured values being supplied by Gschneidner (1991). The measurements were corrected from 273.15 to a 298.15 K base by subtracting 730.27 J/mol... 

As factor Analysis and Varimax rotation were used to examine the validity for coping behaviors, five factors were determined. The five factors together can explain 65.6 percent of the total variances. Based on the content analysis of each factor, five factors were named after the same titles nsed by Havlovic and Keenan (1995), they were direct actions, positive thinking, seeking help, avoiding stress, and using alcohol/tobacco. As the reliability analysis was done, these five factors Cronbach alphas ranged from. 88 to. 68. 

The first decay-constant systematics proposed is called the Geiger-Nuttall rule (see Eq. (2.60) in Chap. 2). This rule, set up originally as a decay-constant - alpha-range relationship, can be readily converted into the following half-life - alpha-energy relationship ... 

Alpha range Beta range Sleep spindles K complexes... 

Twenty five isotopes of polonium are known, with atomic masses ranging from 194 to 218. Polonium-210 is the most readily available. Isotopes of mass 209 (half-life 103 years) and mass 208 (half-life 2.9 years) can be prepared by alpha, proton, or deuteron bombardment of lead or bismuth in a cyclotron, but these are expensive to produce. 

A.luminum Jilkyl Chain Growth. Ethyl, Chevron, and Mitsubishi Chemical manufacture higher, linear alpha olefins from ethylene via chain growth on triethyl aluminum (15). The linear products are then used as oxo feedstock for both plasticizer and detergent range alcohols and because the feedstocks are linear, the linearity of the alcohol product, which has an entirely odd number of carbons, is a function of the oxo process employed. Alcohols are manufactured from this type of olefin by Sterling, Exxon, ICI, BASE, Oxochemie, and Mitsubishi Chemical. 

The alpha-olefin sulfonates (AOS) have been found to possess good salt tolerance and chemical stabiUty at elevated temperatures. AOS surfactants exhibit good oil solubilization and low iaterfacial tension over a wide range of temperatures (219,231), whereas less salt tolerant alkylaromatic sulfonates exhibit excellent chemical stabiUty. The nature of the alkyl group, the aryl group, and the aromatic ring isomer distribution can be adjusted to improve surfactant performance under a given set of reservoir conditions (232,233). 

Boron [7440-42-8] B, is unique in that it is the only nonmetal in Group 13 (IIIA) of the Periodic Table. Boron, at wt 10.81, at no. 5, has more similarity to carbon and siUcon than to the other elements in Group 13. There are two stable boron isotopes, B and B, which are naturally present at 19.10—20.31% and 79.69—80.90%, respectively. The range of the isotopic abundancies reflects a variabiUty in naturally occurring deposits such as high B ore from Turkey and low °B ore from California. Other boron isotopes, B, B, and B, have half-Hves of less than a second. The B isotope has a very high cross-section for absorption of thermal neutrons, 3.835 x 10 (3835 bams). This neutron absorption produces alpha particles. 

Because the cytotoxic effects of the energetic lithium-7 and alpha particles are spaciaHy limited to a range of only about one-ceU diameter, the destmctive effects are confined to only one or two cells near the site of the event. Thus BNCT involves the selective deUvery of sufficiendy high concentrations of B-containing compounds to tumor sites followed by the irradiation of these sites with a beam of relatively nondestmctive thermal neutrons. The resulting cytotoxic reaction can then in theory destroy the tumor cells that are intimately associated with B target. 

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