[Carbonyl compounds emission and uptake by plant: Research progress].

This paper reviewed the researches on the carbonyl compounds emission and uptake by plants, and discussed the compensation point of the bidirectional exchange of carbonyl compounds between plants and atmosphere. The uptake by leaf stomata and stratum corneum is the principal way for the purification of air aldehydes by plants. After entering into plant leaves, most parts of carbonyl compounds can be metabolized into organic acid, glucide, amino acid, and carbon dioxide, etc. , by the endoenzymes in leaves. The exchange direction of the carbonyl compounds between plants and atmosphere can be preliminarily predicted by the compensation point and the concentrations of ambient carbonyl compounds. This paper summarized the analytical methods such as DNPH/HPLC/UV and PFPH/GC/MS used for the determination of carbonyl compounds emitted from plants or in plant leaves. The main research interests in the future were pointed out, e. g. , to improve and optimize the analytical methods for the determination of carbonyl compounds emitted from plants and the researches on systems (e. g. , plant-soil system), to enlarge the detection species of carbonyl compounds emitted from plants, to screen the plant species which can effectively metabolize the pollutants, and to popularize the phytoremediation techniques for atmospheric

Urine Metabolite Profiling of Human Colorectal Cancer by Capillary Electrophoresis Mass Spectrometry Based on MRB.

Aim. The study was to investigate the metabolic profile of urine metabolites and to elucidate their clinical significance in patients with colorectal cancer. Methods. Colorectal cancers from early stage and advanced stage were used in this study. Urine samples of colorectal cancer patients and healthy adults were collected and subjected to capillary electrophoresis mass spectrometry based on moving reaction boundary analysis. The metabolic data were analyzed by SPSS 17.0 to find urinary biomarkers for colorectal cancer. Results. The results indicated that the urine metabolic profiling of colorectal cancer patients had significant changes compared with the normal controls, and there were also differences between early stage and advanced colorectal cancer patients. Compared with the control group, the levels of isoleucine, valine, arginine, lactate acid and leucine increased (P < 0.05), but those of histidine, methionine, serine, aspartic acid, citric acid, succinate, and malic acid decreased in urine samples from colorectal cancer (P < 0.05). Furthermore, the levels of isoleucine and valine were lower in urine of patients with advanced colorectal cancer than those in early stage colorectal cancer (P < 0.05). Conclusion. The technique of capillary electrophoresis mass spectrometry based on MRB could reveal the significant metabolic alterations during progression of colorectal cancer, and the method is feasible and may be useful for the early diagnosis of colorectal cancer.

2-(1,2-Dimethyl-1H-indol-3-yl)-1-{5-[3-(1,3-dioxolan-2-yl)phen-yl]-2-methyl-thio-phen-3-yl}-3,3,4,4,5,5-hexa-fluoro-cyclo-pent-1-ene.

The title compound, C(29)H(23)F(6)NO(2)S, a member of a new family of photochromic diaryl-ethene compounds having an unsymmetrically substituted hexa-fluoro-cyclo-pentene unit, displays dihedral angles between the indole and thio-phene rings of 52.5 (4)°, and between the indole ring and the planar C-C=C-C unit of the cyclopentene ring of 53.8 (6)°. The distance between the potentially reactive C atoms from the two heteroaryl substituents of 3.817 (6) Šis proven to be short enough for photocyclization to occur.

Poly[µ-5-ammonio-isophthalato-aqua-µ-oxalato-dysprosium(III)].

The title complex, [Dy(C(8)H(6)NO(4))(C(2)O(4))(H(2)O)](n), is a dysprosium coordination polymer with mixed anions and was obtained under hydrothermal conditions. In the structure, the oxalate and 5-amino-isophthalate ligands link the dysprosium ions, building up a two-dimensional metal-organic framework parallel to the (10) plane. These sheets are further connected through O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds, forming a three-dimensional supra-molecular structure.

[Study on the intervening mechanism of taurine on streptozotocin-induced diabetic cataracts].

OBJECTIVE: To investigate the effects of various concentrations of taurine on streptozotocin (STZ)-induced diabetic cataracts in rats by biochemistry, radioimmunology and capillary zone electrophoresis (CZE). METHODS: One hundred Sprague-Dowley (SD) male rats, weight 180 approximately 200 g, were randomly divided into 5 groups: normal control, STZ plus saline, STZ plus 2% taurine, STZ plus 4% taurine and STZ plus 8% taurine groups. After being fasted for 12 hours, the rats of the STZ group (with or without taurine) were prepared by STZ intraperitoneal injection (55 mg/kg b.w.). Taurine-treated groups received 2%, 4% and 8% taurine injections once daily for 12 weeks (5 ml/kg b.w.). STZ group without taurine received a saline injection once daily for 12 weeks (5 ml/kg b.w.). During the experiment period, blood sugar was measured by ONE TOUCH II. At the end of experiment, several biochemical parameters were measured by Beckman CX-7, insulin was measured by (125)I-insulin radioimmunological detecting kit and the level of taurine in the aqueous humor and the lens was measured by Beckman 5500 capillary zone electrophoresis (CZE) model. RESULTS: Three weeks after the administration of STZ, the lenses showed vesicle and light opacity in the STZ group. Taurine suppressed the occurrence of early stage cataract obviously. Four to 12 weeks after the administration of STZ, the lens opacity in the 4% and 8% taurine treatment groups was markedly delayed as compared with that of the STZ group. The level of blood glucose in the 4% and 8% taurine groups was decreased evidently compared to that of the STZ group on 4 days, 4 weeks, and 8 weeks (the 4% taurine group). No difference could be detected between the STZ group and taurine treatment groups in 12 weeks. In the 4% and 8% taurine groups, the level of triglycerides decreased markedly compared to that of the STZ group and was near that of the control group. There were no differences of other biochemical parameters among all groups. In the 8% taurine group, the level of taurine in the aqueous humor and lens was increased obviously compared to that of the STZ group (P = 0.036 or P = 0.000, respectively). CONCLUSION: The intervening effect of taurine on STZ-induced diabetic cataract is dose-dependent. This effect is not only related to decreases in the levels of blood sugar and triglycerides, but is also related to an increase in the taurine level in the aqueous humor and lens of diabetic rats, which enables the lens to escape from oxidant injury.