This study examined chemical composition of tomato stalks and their possible feasibility in the production of particleboard. Three-layer experimental particleboards with density of 0.53, 0.63, and 0.73 g cm(-3) were manufactured from tomato stalks using certain ratios of urea formaldehyde (UF) and melamine urea formaldehyde (MUF) adhesives. Modulus of elasticity (MOE), modulus of rupture (MOR),...

The interactions of a series of urea based neutral hydrogen bond donor anion receptors have been investigated with i) alkylcarbamate anions formed by the reaction of carbon dioxide with primary aliphatic amines and ii) the zwitterionic species formed by the reaction of carbon dioxide with 1,4,5,6-tetrahydropyrimidine. Significant downfield chemical shift changes were observed for the urea NH pr...

In the title compound, C(20)H(15)ClN(2)OS, the benzene rings of the biphenyl group are at an angle of 44.23 (12)°. The C(4)N(2)OS central thio-urea fragment makes dihedral angles with the benzene carbonyl and chloro-benzene rings of 55.96 (9) and 64.09 (9)°, respectively. The trans-cis geometry of the thio-urea group is stabilized by the intra-molecular hydrogen bond between the carbonyl O atom...

The title compound, C(19)H(16)N(2)O(2)S, was synthesized from furoyl isothio-cyanate and N-benzyl-aniline in dry acetone and the structure redetermined. The structure [Otazo-Sánchez et al. (2001 ▶). J. Chem. Soc. Perkin Trans. 2, pp. 2211-2218] has been re-determined in order to establish the intramolecular and intermolecular inter-actions. The thio-urea group is in the thio-amide form. The thi...

Using end-labelled RNA, significant changes in base specificity of three nucleases have been detected under defined conditions. Staphylococcus aureus nuclease at pH 3.5 without Ca++ cleaves all Pyr-N bonds more uniformly and efficiently than RNase A, without any preference for Pyr-A bonds. At pH 7.5 in 10 mM Ca++ this enzyme cleaves all N-C and N-G bonds slowly, whereas N-U and N-A bonds are hy...

In the title compound, C(14)H(10)N(4)O(5)S·0.5C(3)H(6)O, the nitro-benzoyl and nitro-phenyl groups have trans and cis configurations, respectively, with respect to the thio-urea S atom. The mol-ecular conformation is stabilized by intra-molecular N-H⋯O and C-H⋯S hydrogen bonds. The acetone solvent mol-ecule possesses a crystallographically imposed twofold axis. In the crystal packing, thio-urea...

The title compound, C(11)H(10)N(2)O(3)S, was synthesized from furoyl isothio-cyanate and furfurylamine in dry acetone. The thio-urea group is in the thio-amide form. The trans-cis geometry of the thio-urea group is stabilized by intra-molecular hydrogen bonding between the carbonyl and cis-thio-amide and results in a pseudo-S(6) planar ring which makes dihedral angles of 2.5 (3) and 88.1 (2)° w...

The title compound, C(11)H(9)N(3)O(2)S, crystallizes with two independent mol-ecules in the asymmetric unit. The central thio-urea core makes dihedral angles of -3.3 (3) and 0.6 (3)° with the furan carbonyl groups in each mol-ecule, whereas the pyridine ring is inclined by 4.63 (2) and 11.28 (7)°, respectively. The trans-cis geometry of the thio-urea fragment is stabilized by an intra-molecular...

Though OmpT has been reported to mainly cleave the peptide bond between consecutive basic amino acids, we identified more precise substrate specificity by using a series of modified substrates, termed PRX fusion proteins, consisting of 184 residues. The cleavage site of the substrate PRR was Arg140-Arg141 and the modified substrates PRX substituted all 19 natural amino acids at the P1' site ins...

The mol-ecule of the title compound, C(14)H(12)ClN(3)OS, consists of three approximately planar fragments: the central thio-urea group, the chloro-phenyl group and the picolyl (3-methyl-pyridin-2-yl) group with a maximum of 0.035 (2)° for an N atom from the mean square plane of the central thiourea group. The central fragment forms dihedral angles of 33.30 (8) and 76.78 (8)° with the chloro-phe...