Results 121 to 130 of about 6,311,407 (143)
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2009
Head injuries are defined as injuries to the soft tissues of the orofacial region and the scalp and/or the bony tissues of the skull (calvarium, base, and orofacial bones) and/or the intracranial contents (meninges, brain) due to mechanical or nonmechanical trauma.
Bilo, Rob A.C. +2 more
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Head injuries are defined as injuries to the soft tissues of the orofacial region and the scalp and/or the bony tissues of the skull (calvarium, base, and orofacial bones) and/or the intracranial contents (meninges, brain) due to mechanical or nonmechanical trauma.
Bilo, Rob A.C. +2 more
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Die Makromolekulare Chemie, 1979
AbstractThe thermal degradation behavior of head‐to‐head (H‐H) and head‐to‐tail (H‐T) polystyrenes and poly(vinylcyclohexane)s has been investigated by direct pyrolysis in a mass spectrometer. Both H‐H and H‐T isomers show only small differences in their initial temperatures of decomposition but remarkably different degradation processes.
Ingo Lüderwald, Otto Vogl
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AbstractThe thermal degradation behavior of head‐to‐head (H‐H) and head‐to‐tail (H‐T) polystyrenes and poly(vinylcyclohexane)s has been investigated by direct pyrolysis in a mass spectrometer. Both H‐H and H‐T isomers show only small differences in their initial temperatures of decomposition but remarkably different degradation processes.
Ingo Lüderwald, Otto Vogl
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Head-to-Head Polymers. XXVIII. Attempted Syntheses of Linear Head-to-Head Polyisobutylene
Journal of Macromolecular Science: Part A - Chemistry, 1985Abstract 2,2,3,3-Tetramethyl-1,4-dibromobutane, when used as monomer for polymerization by Wurtz-type polycondensation, gave head-to-head polyisobutylene which is branched. Under similar conditions, 2, 5-dimethyl-2, 5-dibromohexane gave no polymer.
Michael Malanga, Otto Vogl
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Head-to-head polymers—I. The preparation and some properties of head-to-head polypropylene
European Polymer Journal, 1979Abstract Samples of head-to-head polypropylene have been prepared by the hydrogenation of two polydienes; 1,4-poly(2,4-hexadiene) and 1,4-poly(2,3-dimethyl-1,3-butadiene). Glass transition temperatures were found to be marginally lower than for conventional polypropylene suggesting that the head-to-head placements in the chain increased the polymer ...
S. Arichi, John M. G. Cowie, M.Y. Pedram
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Head-to-head polymers—II. Dilute solution properties of head-to-head polypropylene
European Polymer Journal, 1979Abstract The behaviour in dilute solution of head-to-head (H-H) polypropylenes, covering the range M n = 0.22 to 4.19 × 104, has been studied in cyclohexane as solvent at 303 K. The data could be represented by two distinct Mark-Houwink equations describing the low and the high molecular weight regions. The unperturbed dimensions of (H-H)
S. Arichi, John M. G. Cowie, M.Y. Pedram
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Synthesis of a head to head cholaphane
Tetrahedron Letters, 1997Abstract A general synthetic route for the construction of head to head cholaphanes, a new type of steroidal macrocycles, has been described.
Pramod S. Pandey, Rhiddi B. Singh
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5 to 7 Educator, 2010
Head lice can be bothersome for teachers and administrative staff. However, with the right approach, head lice management needn′t be a such a reoccurring problem
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Head lice can be bothersome for teachers and administrative staff. However, with the right approach, head lice management needn′t be a such a reoccurring problem
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1975
Declared independent 1912, invaded by Austria in 1916. Italian C.-in C. in Albania proclaims independence again on 3 June 17. A provisional republican government ruled until 1921, followed by government under a Council of Regents until Jan 25, when Albania was proclaimed a Republic.
Chris Cook, John Paxton
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Declared independent 1912, invaded by Austria in 1916. Italian C.-in C. in Albania proclaims independence again on 3 June 17. A provisional republican government ruled until 1921, followed by government under a Council of Regents until Jan 25, when Albania was proclaimed a Republic.
Chris Cook, John Paxton
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Nature Chemistry, 2014
Enantiomerically pure head-to-head-to-tail triple-stranded helicates synthesized using a subcomponent self-assembly approach possess high anticancer activities against cancer cell lines without significant damage to DNA and with low toxicity to bacteria.
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Enantiomerically pure head-to-head-to-tail triple-stranded helicates synthesized using a subcomponent self-assembly approach possess high anticancer activities against cancer cell lines without significant damage to DNA and with low toxicity to bacteria.
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