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  • N terminus
  • The amino acid at the end of a peptide or protein chain that has its α-amino group intact; that is, the α-amino group is not part of a peptide bond.
  • n-Butane
  • Common name for butane CH3CH2CH2CH3
  • n-Butyl group
  • The group CH3CH2CH2CH2 --
  • N-Nitroso amine
  • A compound of the type R2N-N=O. R may be alkyl or aryl groups, which may be the same or different. N-Nitroso amines are formed by nitrosation of secondary amines.
  • n-Pentane
  • The common name for pentane, CH3CH2CH2CH2CH3
  • Nanaotube
  • A form of elemental carbon composed of a cylindrical cluster of carbon atoms.
  • Neopentane
  • The common name for 2,2-dimethylpropane, (CH3)4C.
  • Network polymer
  • Synonymous with cross-linked polymer LINK
  • Neurotransmitter
  • Substance, usually a naturally occurring amine, that mediates the transmission of nerve impulses.
  • Newman projection
  • Method for depicting conformations in which one sights down a carbon-carbon bond and represents the front carbon by a point and the back carbon by a circle. FIG
  • Nitration
  • Replacement of a hydrogen by an –NO2 group. The term is usually used in connection with electrophilic aromatic substitution Equ
  • Nitrile
  • A compound of the type FIG . R may be alkyl or aryl. Also known as alkyl or aryl cyanides. LINK
  • Nitrogen rule
  • The molecular weight of a substance that contains C,H, O, and N is odd if the number of nitrogens is odd. The molecular weight is even if the number of nitrogens is even.
  • Nitrosamine
  • See N-nitroso amine. LINK
  • Nitrosation
  • The reaction of a substance, usually an amine, with nitrous acid. Primary amines yield diazonium ions; secondary amines yield N-nitroso amines. Tertiary aromatic amines undergo nitrosation of their aromatic ring.
  • Noble gases
  • The elements in group 8A of the periodic table (helium, neon, argon, krypton, xenon, radon). Also known as the rare gases, link they are, with few exceptions, chemically inert.
  • Nodal surface
  • A plane drawn through an orbital where the algebraic sign of a wave function changes. The probability of finding an electron at a node is zero.
  • NSAIDs
  • Nonsteroidal anti-inflammatory drugs.
  • Nuclear magnetic resonance (NMR) spectroscopy
  • A method for structure determination based on the effect of molecular environment on the energy required to promote a given nucleus from a lower energy spin state to a higher energy state.
  • Nucleic acid
  • A polynucleotide present in the nuclei of cells.
  • Nucleophile
  • An atom or ion that has an unshared electron pair which can be used to form a bond to carbon. Nucleophiles are Lewis bases.
  • Nucleophilic acyl substitution
  • Nucleoplhilic substitution at the carbon atom of an acyl group
  • Nucleophilic addition
  • The characteristic reaction of an aldehyde or a ketone. An atom possessing an unshared electron pair bonds to the carbon of the C=O group, and some other species (normally hydrogen) bonds to the oxygen. FIG
  • Nucleophilic aliphatic substitution
  • Reaction in which a nucleophile replaces a leaving group, usually a halide ion, from sp3-hybridized carbon. Nucleophilic aliphatic substitution may proceed by either an SN1 or an SN2 mechanism.
  • Nucleophilic aromatic substitution
  • A reaction in which a nucleophile replaces a leaving group as a substituent on an aromatic ring. Substitution may proceed by an addition-elimination mechanism or an elimination-addition mechanism.
  • Nucleophilicity
  • A measure of the reactivity of a Lewis base in a nucleophilic substitution reaction.
  • Nucleoside
  • The combination of a purine or pyrimidine base and carbohydrate, usually ribose or 2-deoxyribose
  • Nucleosome
  • A DNA-protein complex by which DNA is stored in cells
  • Nucleotide
  • The phosphate ester of a nucleoside
Department of Chemistry & Chemical Biology