摘要：
Gd/N codoped nano-TiO2 photocatalyst were synthesized by a sol–gel method and characterized by various analytical methods, such as TEM, XRD and UV–vis–DRS. The photocatalytic activity was evaluated by the photodegradation of Humic Acids (HA) in an aqueous solution under the ultraviolet irradiation. The experiment results showed that as-produced samples had higher photodegradation for HA than that of P25, N doped nano-TiO2, and Gd doped nano-TiO2. Gd nanoparticles doped on the surface act as electron traps, enhancing the separation of electron-hole pairs, N atoms doped in TiO2 narrow the band gap, Gd/N codoped TiO2 nanopowders benefit from both of the effects.
摘要：
In this paper, we investigated three ligand systems, symmetric and asymmetric pyridyl-containing tridentate ligands (L1NH2 = (bis(2-pyridylmethyl)-amino)-ethylamine, L2H = (bis(2-pyridylmethyl)-amino)-acetic acid, L3NH2 = [(6-amino-hexyl)-pyridyl-2-methyl-amino]-acetic acid) as bifunctional chelating agents for labeling biomolecules. These ligands reacted with the precursor fac-[188Re(CO)3(H2O)3]+ and yielded the radioactive complexes fac-[188Re(CO)3L] (L = three ligands), which were identified by RP-HPLC. The corresponding stable rhenium tricarbonyl complexes (1–3) were allowed for macroscopic identification of the radiochemical compounds. 188Re tricarbonyl complexes, with log Po/w values ranging from −1.36 to −0.32, were obtained with yields of ≥90% using ligand concentrations within the 10−6−10−4M range. Challenge studies with cysteine and histidine revealed the high stability properties of these radioactive complexes, and biodistribution studies in normal mice indicated a fast rate of blood clearance and high rate of total radioactivity excretion, primarily through the renal-urinary pathway. In summary, these asymmetric and symmetric pyridyl-containing tridentate ligands are potent bifunctional chelators for the future biomolecules labeling of fac-[188Re(CO)3(H2O)3]+.
摘要：
The solubility of malachite in the presence of ammonia, ammonium chloride and their mixed solution is calculated by a geochemical modeling code and is measured in a series of dissolution experiments using synthetic malachite at 25 °C. The simulated results show a good agreement with the experimental data gained at 25 °C. The predicted and experimental results indicate that the precipitate CuO limits the copper solubility in aqueous ammonia and Cu(OH)1.5Cl0.5 in aqueous ammonium chloride. For a mixed solution containing ammonia and ammonium chloride, highest copper solubility can be achieved by adjusting the [NH3]/[NH4Cl] ratio to about 2:1. The thermodynamic model presented rationalises the interactions between the different components and predicts the influence of changes in the concentration of ammonia and ammonium chloride on the copper solubility of malachite.
摘要：
The title mononuclear zinc(II) complex, [Zn(C(11)H(16)N(2)O(2))(2)-(NCS)] NCS center dot 0.5H(2)O, consists of a complex cation, a thiocyanate anion, and half of a water molecule. The Zn II atom in the cation is five-coordinated by two imine N and two phenolate O atoms from two bidentate Schiff base ligands, and by one N atom of a thiocyanate ligand, forming a distorted trigonal-bipyramidal geometry. The ammonio H atoms are involved in hydrogen bonding with the ligand O atoms and the solvent water molecules (site occupation factor 0.5), which partially determines the conformation of the ligands.
摘要：
All the non-hydrogen atoms except one methyl C atom of the title compound, C13H15NO3 lie on a crystallographic mirror plane perpendicular to the b axis. The crystal packing is stabilized by two weak inter-molecular C - H⋯O hydrogen bonds.
摘要：
Processing and enriching technology of high concentration γ-aminobutyric acid extraction from rice bran were investigated. Through fermentation experiment, the optimum rice bran extraction conditions were obtained： rice bran at pH = 6.0, temperature 50 ℃ and water bath extracting for 4 h; content can reach up to 110mg/100ml. While the best fermentation conditions were as follows ： pH =6.0, adding Bulgaria 乳酸杆菌, Lactobacillus Fermentation 16 hours at 45℃. At that condition the GABA content can be increased to 114.2mg/100ml.
摘要：
Aim of the study: Total flavonids of Polygonatum(P) odoratum (TFP) were tested for anti-diabetic activity in streptozotocin (STZ)-induced diabetic mice and alloxan-induced diabetic rats. Materials and methods: Rhizoma Polygonati Odorati, well-known Chinese traditional medicine, is widely used for treatment of diverse diseases for example diabetes. In our study,TFP was extracted by 70% ethanol and purified by macroreticular resin. The experiments were designed to detect the anti-diabetic activity of TFP by determination of blood glucose (BG) using one touch gluco-meter and insulin levels by using a radioimmunoassay kit in streptozotocin (STZ)-induced diabetic mice and alloxan-induced diabetic rats and alpha-amylase inhibitory activity by alpha-amylase inhibition assay in vitro. Results: TFP had beneficial effects on regulation of blood glucose. Daily administration with 50-200 mg/kg body weight of TFP for 9 days can reduce significantly hyperglycemia in STZ-induced diabetic mice. Thirtieth day administration with TFP (50-200 mg/kg body weight) also decreased significantly fasting blood glucose in alloxan-induced diabetic rats. The hypoglycemic effect of TFP at 50 and 100 mg/kg is less than that of acarbose 20 mg/kg and gliclazide 15 mg/kg. The hypoglycemic effects of TFP at 200 mg/kg is similar to that of acarbose 20 mg/kg and gliclazide 15 mg/kg. TFP also could increase significantly the insulin level in alloxan-induced type 2 diabetic rats (P < 0.05) compared with control. Alpha-amylase inhibition assay in vitro showed that TFP inhibited significantly alpha-amylase activity in a dose-dependent manner. Conclusions: TFP possess significant dose-dependent anti-diabetic activity. TFP is one of the primary hypoglycemic active compounds of Polygonatum odoratum which would worth further study and development. (C) 2009 Published by Elsevier Ireland Ltd.
关键词：
DNA polymorphism;Gastrodia elata Blume;Gastrodin;Genetic relationships;Chemical fingerprints
摘要：
Gastrodia tuber and its component gastrodin have many pharmacological effects. The chemical fingerprints and gastrodin contents of eight Gastrodia populations were determined, and the genomic DNA polymorphism of the populations was investigated. Genetic distance coefficients among the populations were calculated using the DNA polymorphism data. A dendrogram of the genetic similarities between the populations was constructed using the genetic distance coefficients. The results indicated that the genomic DNA of Gastrodia tubers was highly polymorphic; the eight populations clustered into three major groups, and the gastrodin content varied greatly among these groups. There were obvious correlations among genetic makeup, gastrodin content, and place of origin. The ecological environments in Guizhou and Shanxi may be conducive to evolution and to gastrodin biosynthesis, and more suitable for cultivation of Gastrodia tubers. These findings may provide a scientific basis for overall genetic resource management and for the selection of locations for cultivating Gastrodia tubers.
作者机构：
[熊鹰] College of Environmental Science and Engineering, Hunan Univ, Changsha, Hunan 410082, China;[熊鹰] Department of Resource and Environment, Changsha Univ of Science and Technology, Changsha, Hunan 410076, China
通讯机构：
College of Environmental Science and Engineering, Hunan Univ, China
摘要：
A novel optical biosensor with gold surface bound silver nanoparticles has been constructed for detection of bio-molecules like antigen, antibody protein and DNA plasmid, which exhibited distinct optical properties of localized surface plasmon resonance (LSPR). The silver colloidal nanoparticles were prepared by using sodium borohydride reduction of silver nitrate and characterized by using UV-vis absorption spectroscopy, transmission electron microscopy (TEM), and cyclic voltammetry (CV), indicating that the silver colloidals were pure, sphere-shaped and narrow-dispersed size distribution with a diameter of 10 plusmn 0.5 nm. The silver nanoparticles were well assembled on the gold surface. It caused 3.08 nm of red shift in the peak wavelength (lambdamax) of LSPR spectrum for the nanosensor exposed to c-Myc (3C7) mouse monoclonal IgG and 3.36 nm of red shift to the corresponding antibody by the immuno-reaction subsequently. The LSPR nanobiosensor has been successfully applied to recognition of a DNA plasmid of pCMV-Myc Mammalian Expression Vector.
