Glass libre

Fin. 2. Brittle fnictures. (a,b) Glass libres. (c.cl) Ceramic fibres, Nexlcl, Nicolon. (e) Carbon fibre from rayon precursor, (f) Elastomeric Lycra. For further explanation, see Fig. I. 

Diacetoxylation of 1,3-butadiene (typical procedure) To a mixture of TeOj (0.80 g, 5 mmol), LiBr (2.17 g, 25 mmol), AcOH (18 mL) and AC2O (2 mL) in a glass pressure bottle, chilled at -20°C, is added chilled 1,3-butadiene (1.35 g, 25 mmol). The resulting suspension is heated (oil bath) at 120-130°C for 20 h under magnetic stirring, producing a... 

Cai et al. [7e] investigated electron and hole transfer in various polynucleotide duplexes and compared them with previous results found for salmon sperm DNA, to examine the effect of base sequence on excess electron and hole transfer along the DNA 71-way at low temperature. Electron and hole transfer in DNA was found to be clearly base sequence dependent. In glassy aqueous systems (7M LiBr glasses at 77 K), excess electron-transfer rates increase in the order polydIdC-polydIdC<salmon testes DNAexcess electron and hole transfer rates increase in the order polyC-polyG<salmon testes DNATransfer distances at 1 min and distance decay constants for electron and hole transfer from base radicals to MX in polynucleotides-MX and DNA-MX at 77 K are derived and compiled in Table 3. This table clearly shows that the electron-transfer rate from donor sites decreases in... 

Glass indicates frozen 7 M LiBr aqueous solutions... 

Base Sequence Effects on Excess Electron Transfer. Cai et al.69 investigated low temperature electron and hole transfer to intercalator trapping sites in various polynucleotide duplexes and compared them with previous results found for salmon sperm DNA. Electron and hole transfer in DNA was found to be base sequence dependent. In glassy aqueous systems (7 M LiBr, D20 glasses at 77 K), excess electron-transfer rates increase in the order polydldC-polydldC < DNA... 

Lithium borohydride, 1, 603 4, 296. Solutions of the hydride in ether or THF can be prepared readily by treatment of NaBH4 (suspension) with LiBr (mechanical stirring with glass beads present).1... 

Lithium-base greases, especially the stearate, are efficient over an extremely wide temperature range up to 160°C. Lithium hydroxide (LiOH) is a component of the electrolyte in alkaline storage batteries and is employed in the removal of carbon dioxide in submarines and space capsules. Lithium bromide (LiBr) brine is used for air conditioning and dehumidification. Lithium hypochlorite (LiOCl) is a dry bleach used in commercial and home laundries. Lithium chloride (LiCl) is in demand for low-temperature batteries and for aluminum brazing. Other uses of lithium compounds include catalysts, glass manufacture, and, of course, nuclear energy. 

In the relevant experiment to determine electron transfer, the DNA intercalator mitoxantrone (MX) is used. MX binds well to DNA and has a high electron affinity. MX appears to intercalate randomly if used at an intercalator base-pair ratio of 1/20 or less. In a 7-M LiBr glass at 77 K, /-irradiation produces electrons that attach randomly onto the DNA and MX, and the holes are... 

Pal C, Hiittermann J. (2006) Postirradiation electron transfer vs differential radical decay in X-irradiated DNA and its mixtures with additives. Electron spin resonance spectroscopy in LiBr glass at low temperatures. J Phys Chem B 110 14976-14987. 

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