Introduction: This meta-analysis was performed to confirm the relationship of gestational diabetes mellitus (GDM) and vitamin D. Material and methods: PubMed and CNKI databases were searched for relevant articles. Standard mean difference (SMD) along with 95% CI was used to compare vitamin D level between women with GDM and healthy subjects. The correlation coefficient between the vitamin D and homeostasis model assessment-insulin resistance index (HOMA-IR) was analyzed. Results: The vitamin D level of GDM subjects was much lower than healthy subjects (SMD =-0.71, 95% CI:-0.91,-0.50). Vitamin D deficiency was associated with high risk of GDM (OR = 1.15, 95% CI: 1.07-1.23). Vitamin D was negatively correlated with HOMA-IR (r =-0.62, 95% CI:-0.85,-0.39). The analysis showed no publication bias (Egger's: p = 0.197; Begg's: p = 0.786). Conclusions: Vitamin D is closely associated with the onset of GDM.

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Octahedral and rod-like γ-CuI nanocrystals have been fabricated by using a mild solution method in water, methanol and ethanol respectively. X-ray diffraction (XRD) and field emission-scanning electron microscopy (FE-SEM) were used to characterize the product. The as-synthesized CuI demonstrates higher activity for the Sonogashira cross-coupling of 4-iodoanisole and phenylacetylene.

The photodegradation (λ＝365 nm) of the biomolecule vitamin B 12 , catalyzed by the photocatalyst TiO 2 nanoparticles (NPs), has been investigated in aqueous suspension. The photodegradation process of vitamin B 12 has been monitored by means of electronic absorption (Abs), Fourier-transform infrared (FT-IR), and resonance Raman (RR) spectroscopies, respectively. The results show that only under UV illumination in the presence of TiO 2 is there effective degradation, and the photocatalytic degradation of vitamin B 12 is strongly influenced by the amount of TiO 2 NPs, the pH, and the initial concentration of vitamin B 12 . The photocatalytic reaction kinetics of vitamin B 12 conforms to a Langmuir-Hinshelwood isotherm model. Changes involving the three structural units of the carbon-metal bond C-Co, the organic corrin macrocycle combined with the benzimidazole nucleotide, and the inorganic CN in the vitamin B 12 molecule during the photocatalytic degradation are also discussed.

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