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quaternary
The trace representation of the dual of quaternary Goethals code G(m) is given.
      
Synthesis and surface-active property of bis-quaternary ammonium-sodium sulfate Gemini surfactant
      
N,N-dimethyldodecylamine, hydrochloride and epichlorohydrin (molar ration is 2:1:1) were used to synthesize bis-quaternary ammonium Gemini surfactant with a hydroxyl in its spacer group by the one-pot method.
      
This hydroxyl was sulfonated by chlorosulfonic acid and then neutralized to bis-quaternary ammonium-sodium sulfate zwitterionic Gemini surfactant.
      
Synthesis of bis-quaternary ammonium peroxotungstates (peroxomolybdates) and their catalytic activity in oxidation of alcohols b
      
Three kinds of bis-quaternary ammonium salts of peroxotungstate and peroxomolybdate, such as PhCH2N-(CH2)6NCH2Ph[W(O2)4] · 2H2O, PhCH2N(CH2)6NCH2Ph[W-O(O2)2(C2O4)] and PhCH2N(CH2)6NCH2Ph[MoO(O2)2(C2O4)], have been synthesized and characterized.
      
The results show that the bis-quaternary ammonium peroxotungstates are excellent catalysts in the oxidation of benzyl alcohol and cyclohexanol under moderate conditions.
      
However, the catalytic ability of bis-quaternary ammonium peroxomolybadates is relatively poor.
      
The distribution of Abies was deeply influenced by geological events such as the uplift of Himalaya, the Alps, the Rocky Mountains, the occurrence of the Asian Monsoon as well as the Quaternary glaciers.
      
Finally, the current distribution pattern appeared in the Quaternary.
      
The endemism was formed when some dispersal routes such as the North Atlantic Land Bridge, and the Bering Bridge became discontinuous during the Tertiary, as well as the climate change and glaciations in the late Tertiary and the Quaternary.
      
Derivatives of benzyl alcohol containing the quaternary ammonium fragment possessed auxin and anti-gibberellin (retardant) properties.
      
Polycondensation of a catalase (EC 1.11.1.6) with glutaraldehyde in order to stabilize the quaternary structure of an enzyme, maintain its activity, and protect it from thermal denaturation was studied.
      
Testaceans (Protozoa: Testacea) in Quaternary Permafrost Sediments of Bykovsky Peninsula, Arctic Yakutia
      
Special attention is given to the search for possible protein-partners including melittin-like protein and to the mechanism of enzyme regulation connected with the change of Na,K-ATPase quaternary structure.
      
GroEL kept its quaternary structure and activity even when treated with 10 mM hydrogen peroxide.
      
The quaternary structure of human brain GS at 10 μM (subunit concentration) was not significantly affected by cations, such as magnesium (5 and 20 mM) or manganese (0.2 and 1 mM) within the range of pH 7.1-7.8.
      
The spectral data suggested that this unfolding intermediate shared many structural characteristics with the native form of AK including its secondary structure, tertiary structure, as well as its quaternary structure.
      
Electrophoretically homogenous isoforms of malate dehydrogenase with different quaternary structure were prepared from Rhodopseudomonas palustris strain f8pt cultured photolithoheterotrophically on malate and acetate.
      
Mutations mimicking phosphorylation decreased dissociation of HSP22 oligomer at low concentration without affecting its quaternary structure at high protein concentration.
      
 

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