Counting label

RobR73 Robinson, R. W. Counting labeled acyclic digraphs. New Directions in the Theory of Graphs (F. Harary, ed.)... 

In conclusion, our results showed that counting labeled nucleotides directly on dried DEAE disks produces erroneous results. The failure to recognize this is responsible for the variable and low thymidine kinase activities in the cerebellum reported in previous studies (Weichsel, 1974, Weichsel and Dawson, 1976). The elution of the labeled nucleotides with 1 ml of 1 M HCl containing 0.5 M NaCl in the counting vial in improved counting efficiency and reproducibility. Furthermore, it is not necessary to dry the disks, thus the overall method became less time-consuming. 

Many labels/partlcle = High stnsitivity Dttfctor counts labels... 

J. W. Moon, Counting labelled trees, Vol. 1, Canadian Mathematical Monographs, Ottawa,... 

The first studies of trees Counting unrooted trees Counting labeled trees... 

A modem variant is to count the number of atoms directly in a mass spectrometer.) The practical limit is about 50000 y since by this time the activity has fallen to about 0.2% of its original valuable and becomes submerged in the background counts. is also extremely valuable as a radioactive tracer for mechanistic studies using labelled compounds, and many such compounds, particularly organic ones, are commercially available (p. 310). 

A relationship between the numbers A and corresponds to the similarity of the two equations (2.36) and ( ) [of (2.37) and (1 )]. Choose a topological planted tree counted by with n nodes of the same species. Then label these n nodes individually. The resulting... 

LisV69 Liskovec, V. A. On a recurrence method of counting graphs with labelled vertices. Dokl. Akad. Nauk. SSSR 184 (1969) No. 6 1284-1287. Translated in Soviet Math. Dokl. 10 (1969) 242-246. 

Uniformly labeled C-8-D with a specific activity of 2.99 juc/mg was administered orally to pregnant females at 2 /xg/kg/day from 6-15 days of gestation. Three females were sacrificed on alternate days during days 6-20 of pregnancy. Triplicate samples of fetus, placenta, blood, brain, abdominal fat, and sartorius muscle were procured from each female. The samples were dissolved in 1 ml of Soluene (Packard Instruments) to which 15 ml of Aquasol were added. Each sample vial was counted for 30 min in a Nuclear Chicago Mark I liquid scintillation counter. 

Figure 2. Thin-layer radiochromatogram of urine (100 il) from rats injected with labeled PbTx-3. TLC plates were developed in two sequential solvent systems chloroform ethyl acetate ethanol (50 25 25 80 10 10). Radioactive zones were scraped and counted in a liquid scintillation counter. Native PbTx-3 runs at 13 cm.

The tacit assumption above is that the monodromy matrix is defined with respect to the primitive unit cell, with sides (5v, 8fe) = (0,1) and (1, 0), because the twist angle that determines the monodromy is given by A9 = — (Sv/Sfe)j.. However, situations can arise where other choices are more convenient. For example, the energy levels within a given Fermi resonance polyad are labeled by a counting number v = 0,1,... and an angular momentum that takes only even or only odd values. Thus the convenient elementary cell has sides (8v, 8L) = (0,2) and (1, 0), and the natural basis, say, y, is related to the primitive basis, x, by... 

The counting equipment used to establish quantitation is radioassay and radioimmunoassays may be either a gamma counter or a liquid scintillation counter depending upon the isotope being used. Most assays use as a label and require a... 

NSB (non-specific binding) tubes These tubes contain all reagents except the binding protein. They will therefore show those counts that cause an error in that they are due to free label being counted as bound. 

Radioisotope-labeled nitrosamines have proven valuable in development of analytical methods and for demonstrating efficiency of recovery of nitrosamines from tobacco products and smoke (37-39). The very high specific activity required for low part-per-billion determinations has discouraged most analysts from using this approach. Unless a radiochromatographic detector with adequate sensitivity is available, samples must be counted independently of the final chromatographic determination, and one of the advantages of internal standardization, correction for variation in volume injected, is lost. 

Arrangements in which the sets of x contiguous lattice cells chosen for occupation by polymer molecules are identical but which differ only in the permutation of the polymer molecules over these sets would be counted as different in this enumeration scheme. Since the polymer molecules actually are identical, it is appropriate to eliminate this redundancy. We require merely the number Q. of ways in which ri2 sets of X consecutively adjacent cells may be chosen from the lattice the order in which the sets are filled by polymer molecules is immaterial. Since U2 differentiable polymer molecules (labeled, for example, in the order of their insertion into the lattice) could be assigned to a given arrangement of U2 sets of sites in ri2 different ways, it follows that... 

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