RESUMO
OBJECTIVES: To establish a diatom database by analyzing the quatity, species distribution and differences of diatom in water samples of the whole navigable sections of the Beijing-Hangzhou Grand Canal, to provide a reference for the inference of the drowning site. METHODS: Water samples were collected at 22 sites in the navigable sections of the Beijing-Hangzhou Grand Canal (Jining section to Yangzhou Section), and the diatoms at each site were qualitatively and quantitatively analyzed by using graphite digestion-scanning electron microscopy. RESULTS: Sampling site T (Laohuaijiang River Line, Gaoyou City, Yangzhou City, Jiangsu Province) had the highest number of diatoms, while sampling site O (Siyang County, Suqian City, Jiangsu Province) had the lowest number of diatoms, with a large gap of 68 times. At sampling site Q (Jiangpu District, Huaian city, Jiangsu Province), there were 19 species of diatoms. The sampling site O had the least diatoms, with 7 species. There were no significant differences in species evenness and species diversity at each sampling site (P>0.05). Some sampling sites have characterized diatoms, such as Caloneis at station A (Taibai Lake, Weishan County, Shandong Province), Rhoicosphenia at station B (Nanyang Town, Weishan County, Shandong Province), Amphora at station I (Taierzhuang District, Zaozhuang City, Shandong Province) and Epithemia at station J (Pizhou 310 national highway, Xuzhou City, Jiangsu Province). CONCLUSIONS: The species richness of diatoms gradually increased from north to south. Diatom species richness and species diversity might be higher in areas with complex environments and large population flow. Climate type has a certain influence on the distribution of diatoms.
Assuntos
Diatomáceas , Afogamento , Pequim , Humanos , Rios , ÁguaRESUMO
BACKGROUND: Tranexamic acid (TXA) has been used as an anti-fibrinolytic drug for over half a century and has received much attention in recent decades. AIM: To evaluate the efficacy of topical vs intravenous TXA in reducing blood loss and promoting wound healing in bone surgery. METHODS: From the electronic resources, PubMed, Cochrane Library, Embase, ISI, and Scopus were used to perform a literature search over the last 10 years between 2010 and 2020. EndNote™ X8 was used for managing the electronic resource. Searches were performed with mesh terms. The data were retracted blindly by two independent reviewers. Random effects were used to deal with potential heterogeneity and I 2 showed heterogeneity. Chi-square (I 2) tests were used to quantify the extent of heterogeneity (P < 0.01 was considered statistically significant). The efficacy of topical TXA in reducing blood loss and promoting wound healing in bone surgery was compared with intravenous TXA and placebo. RESULTS: According to the research design, 1360 potentially important research abstracts and titles were discovered in our electronic searches, and 18 papers remained in agreement with our inclusion criteria. It was found that TXA reduced 277.51 mL of blood loss compared to placebo, and there was no significant difference between topical TXA and IV TXA in reducing blood loss in bone surgery. Our analyses also showed that TXA significantly reduced blood transfusion compared to placebo and there was no significant difference between topical TXA and IV TXA. CONCLUSION: The use of both topical and intravenous TXA are equally effective in reducing blood loss in bone surgery, which might be beneficial for wound healing after surgery.
