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Reaction of Ph2SnCl2 with 1,3-bis(3,5-dimethylpyrazol-1-yl)-2-propanol (L) in a 1:1 ratio yields L(SnPh2Cl2)2 adduct, which partly hydrolyzes to the title complex (C25H31Cl3N4OSn, Mr = 628.58) during crystal growing in the air. The title complex is of monoclinic, space group P21/n with a = 9.0338(9), b = 17.890(1), c = 17.340(1) Å, β = 95.533(1)o, V = 2798.9(5) Å3, Z = 4, Dc = 1.492 Mg/m3, λ(Mo Kα) = 0.71073 Å, μ = 1.224 mm−1, F(000) = 1272, R = 0.023, wR = 0.054 for 4212 observed reflections with I ≥ 2σ( I). The crystal structure indicates that there is no direct interaction between the pyrazolyl ligand and the tin atom, but this complex forms a supramolecular structure through weak intermolecular C–H⋯Cl and O–H⋯Cl hydrogen bonds. Reaction of Ph2SnCl2 with 1,3-bis(3,5-dimethylpyrazol-1-yl)-2-propanol (L) in a 1:1 ratio yields L(SnPh2Cl2)2 adduct, which partly hydrolyzes to (PzCH2CHOHCH2PzH)·(Ph2SnCl3) (Pz = 3,5-dimethylpyrazol-1-yl) during crystal growing in the air. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

The perchlorate salt of diprotonated 5,8-dimethoxy-2,3-bis(2-pyridyl)quinoxaline, [C20H18N4O2]·(ClO4)2 ·(H2O)2 (1), has been prepared and characterized by 1H NMR, IR, UV–Vis, and elemental analysis, and established by X-ray diffraction technique. In the crystal structure of the title compound, two pyridinio rings form dihedral angles of 38.7(6)° and 26.5(5)° with the mean quinoxaline plane, and a dihedral angle of 52.7(6)° with each other. It is unexpected that the favorite orientation of two protonated pyridyl rings is such that their nitrogen donors are opposite to each other (trans–trans configuration). The most striking feature of this structure resides in the fact that numerous hydrogen-bonding interactions are observed, resulting in a novel double-chain supramolecular architecture along crystallographic [111] direction. There exist significant face-to-face p–p stacking interactions between the interchain neighboring pyridinio rings, which may further stabilize this structure. [ABSTRACT FROM AUTHOR]

Presents information on a study which described the cloning of goats, Gapra hircus, from foetal fibroblast cell lines. Comparison of passage number and starvation period of goat foetal fibroblast cells; Morphological changes in goat foetal fibroblast cells cultured in vitro by transmission and scanning electron microscopy; Materials and methods of the study; Results and discussion.

Discusses the mechanism of sperm-egg recognition during subzonal (perivitelline space) insemination, with reference to a study conducted on the issue. Details on three existing kinds of microinsemination techniques; Methodology used to conduct the study; Results of the study.

The article informs that the addition of inorganic filler has been one of the important methods for the modification of polymeric materials. Recently, increasing attention has been devoted to developing polymer/graphite composites for some important applied cases in which electrical or/and thermal conductivity is required. It is evident that the rheological and mechanical properties of the particle filled polymer composites are much different from those of virgin polymers. Many researchers have paid their interests to the viscoelasticity of the particle filled polymer composites over the past several decades.

Discusses the temperature-dependent dynamic rheological properties of polypropylene filled with ultra-fine powdered rubber. Observation of the phenomenon called second plateau in rheology, which is the formation of ordered structure/morphology induced by aggregation of fillers and a phase-separated system; Toughening effect on polypropylene using ultra-fine powdered rubber.