不同水温调节系统在重庆地区工厂化循环水养鱼系统中的应用分析研究

在工厂化循环水养殖过程中保持水温恒定是水产养殖生产效率的重要保障,为解决工厂化循环水养殖系统调温环节能耗高,对养殖环境影响大等问题,以重庆地区512 m3的养殖场为例。分析了水源热泵、空气源热泵、螺杆机组+锅炉、空气源热泵+锅炉4种水温调节方式的设备初投资和长期运行的适用性。结果表明：空气源热泵的初投资为50.76万元,运行费用为25.82万元,水源热泵分别为48.21万元和16.87万元,均具有较好的长期使用价值。但由于水源热泵在廉价水资源难以获取的地区运行费用较高且维护成本及难度较高,故对于本研究而言空气源热泵,投资以及运行费用较低,整体适应性较好。     

正常孕妇红细胞铁蛋白含量的测定

采用放射免疫法测定了１２６例正常孕妇的红细胞铁蛋白含量。孕妇红细胞铁蛋白（６．９±６．４ａｇ／细胞）低于非孕妇女（９．７±７．３ａｇ／细胞），差异显著。红细胞铁蛋白含量不受妊娠期血容量增加等因素的影响，故能准确地反映孕妇体内的铁储备状况，对孕妇缺铁有较高诊断价值。     

A novel method to improve sow reproductive performance: Combination of pre-weaning immunization against inhibin and post-insemination hCG treatment

The feasibility of a novel method to improve sow reproductive performance by combining inhibin immunization and hCG treatment was tested using in vivo and in vitro experiments. In the in vivo experiment, 106 sows were administered an inhibin immunogen on day 7 prior to weaning, and 56 non-treated sows served as the controls. Sows exhibiting oestrous behaviour on day 5 after weaning were artificially inseminated. On day 5 post-insemination, a subset of 50 inhibin-immunized sows received an injection of 1 000 IU human chorionic gonadotropin(hCG). Our results showed that pre-weaning immunization against inhibin marginally improved(P=0.068) total litter size and significantly increased(P=0.044) the live litter size. The overall differences in farrowing rates and live litter size tended toward significance(P=0.10) in the three groups, and the differences in total litter size were not significant(P=0.18). In the in vitro experiment, activin and hCG dose-dependently suppressed(P0.001) and stimulated(P0.001) progesterone(P4) secretion in cultured pig granulosa cells(GCs), respectively, and the suppression effect of activin was reversed(P0.001) by hCG. Activin suppressed P4 secretion mainly by downregulating(P0.001) the expression of StAR, Cyp11 a1, and 3β-HSDII, whereas hCG prevented(P0.001) the suppression effects. These results indicate that the combination of pre-weaning immunization against inhibin and postinsemination hCG treatment provides a novel method for improving sow reproductive performance.     

Novel Adociaquinone Derivatives from the Indonesian Sponge Xestospongia sp.

Seven new adociaquinone derivatives, xestoadociaquinones A (1a), B (1b), 14-carboxy-xestoquinol sulfate (2) and xestoadociaminals A–D (3a, 3c, 4a, 4c), together with seven known compounds (5–11) were isolated from an Indonesian marine sponge Xestospongia sp. Their structures were elucidated by extensive 1D and 2D NMR and mass spectrometric data. All the compounds were evaluated for their potential inhibitory activity against eight different protein kinases involved in cell proliferation, cancer, diabetes and neurodegenerative disorders as well as for their antioxidant and antibacterial activities.