نتایج جستجو برای: nn dimethyl n octyl chitosan
تعداد نتایج: 1021390 فیلتر نتایج به سال:
The coupling of the breathing and rotational modes of the skyrmionskyrmion system leads to a nucleon-nucleon spin-orbit interaction of short range, as well as to spin-orbit potentials for the transitionsNN → N(1440)N , NN → NN(1440) and NN → N(1440)N(1440). The longest range behaviour of these spin-orbit potentials is calculated in closed form. Preprint HU-TFT-96-57
The title compound, C(15)H(16)N(2), contains two aromatic rings linked through an imino group. The mol-ecule exhibits an E configuration with respect to the C=N bond. The dihedral angle between the aromatic rings is 61.96 (1)°.
In the title compound, C(11)H(15)N(3)O(3), one of the methyl groups attached to the benzamide unit is slightly twisted with a C-N-C-C torsion angle of 4.04 (13)°. The crystal packing is stabilized by weak intermolecular C-H⋯O hydrogen bonds together with a weak C-H⋯π inter-action.
In the title compound, C12H12N2O2, synthesized by ammonolysis of 3-phenyl-isoxazole-5-carbonyl chloride in di-chloro-methane, the dihedral angle between the isoxazole ring and the phenyl ring is 14.05 (7)°. In the crystal, centrosym-metrically related mol-ecules are linked into dimers by pairs of C-H⋯O hydrogen bonds, generating rings of graph-set motif R 2 (2)(10).
In the title compound, C(15)H(16)N(2)O(4)S, there is a dihedral angle of 63.30 (8)° between the nitro-benzyl and benzene rings, which are separated by a sulfonamide unit The crystal packing is stabilized by a C-H⋯O inter-action.
BACKGROUND To explain observed differences during SPF determination using either an in vivo or in vitro method, we hypothesized on the presence of ingredients having anti-inflammatory properties. METHODOLOGY/PRINCIPAL FINDINGS To research our hypothesis, we studied the 21 UV filters both available on the market and authorized by European regulations and subjected these filters to the phorbol-...
PURPOSE Non-viral vectors have been widely proposed as safer alternatives to viral vectors, and cationic polymers have gained increasing attention because they can form self-assembly with DNA. Chitosan is also considered to be a good candidate for gene delivery systems, since it is already known as a biocompatible, biodegradable, and low toxic material with high cationic potential. However, low...
Many aminoazobenzene derivatives have been tested for carcinogenic activity in the rat (1-7). N,N-dimethyl-p-aminoazobenzene and N-methyl-paminoazobenzene have been found to be equally carcinogenic (4, 7). They produced cholangiomas and hepatomas in all animals tested in approximately the same period of time. N,N-dimethyl-3'methyl-4-aminoazobenzene was more carcinogenic than the parent compound...
Two types of hydrophobic aggregates in aqueous solutions of chitosan and its hydrophobic derivative.
The aggregation phenomena in aqueous solutions of hydrophobically modified (HM) chitosan, containing 4 mol % of n-dodecyl side chains, were studied by viscometry and fluorescence spectroscopy with pyrene as a probe. The results are compared with those for unmodified chitosan. Surprisingly, fluorescence data reveal the appearance of intermolecular hydrophobic aggregates both in chitosan and in H...
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