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采用不同饲料配方投喂,研究了普通豆粕(对照组)、发酵豆粕和活性菌肽豆蛋白配合饲料对鲫(Carassius auratus)生长性状影响的研究。结果表明,活性菌肽豆蛋白组的相对体重生长率高于对照组41.87%(P<0.01)和发酵豆粕组19.11%;血清中的三碘甲状腺原氨酸(T3)、甲状腺素(T4)、胰岛素样生长因子-I(IGF-I)和生长激素(GH)含量活性菌肽豆蛋白组最高,其次是发酵豆粕组,而对照组最低;实时定量PCR检测显示:IGFs(IGF-I和IGF-II)基因的表达量在活性菌肽豆蛋白组中最高,其次是发酵豆粕组,对照组的表达量最低。GHR基因的表达量在活性菌肽豆蛋白组和发酵豆粕组间无显著性差异,但明显高于对照组。因此,活性菌肽豆蛋白可能通过调控鲫血清GH、IGF-I、T3和T4等激素水平,及肝脏GHR和IGFs基因的表达,进而影响鲫的生长。 相似文献
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A new computer program, FLASH (Flow-Log Analysis of Single Holes), is presented for the analysis of borehole vertical flow logs. The code is based on an analytical solution for steady-state multilayer radial flow to a borehole. The code includes options for (1) discrete fractures and (2) multilayer aquifers. Given vertical flow profiles collected under both ambient and stressed (pumping or injection) conditions, the user can estimate fracture (or layer) transmissivities and far-field hydraulic heads. FLASH is coded in Microsoft Excel(5) with Visual Basic for Applications routines. The code supports manual and automated model calibration. 相似文献
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红土型金富集与胶态金的形成及其与富氧化铁介质的相互作用有关，在２５℃下，测量了吸附在合成的针铁矿和赤铁矿上的胶态金。在相反电荷粒子间观察到的强亲和力取决于介质成分，柠檬酢卤阴离子的存在抑制相互凝结作用，而惰性和电解质加强这种作用 相似文献
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The USGS conducted a geophysical investigation in support of a U.S. Naval Facilities Engineering Command, Southern Division field-scale biostimulation pilot project at Anoka County Riverfront Park (ACP), down-gradient of the Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota. The goal of the pilot project is to evaluate subsurface injection of vegetable oil emulsion (VOE) to stimulate microbial degradation of chlorinated hydrocarbons. To monitor the emplacement and movement of the VOE and changes in water chemistry resulting from VOE dissolution and/or enhanced biological activity, the USGS acquired cross-hole radar zero-offset profiles, travel-time tomograms, and borehole geophysical logs during five site visits over 1.5 years. Analysis of pre- and postinjection data sets using petrophysical models developed to estimate VOE saturation and changes in total dissolved solids provides insights into the spatial and temporal distribution of VOE and ground water with altered chemistry. Radar slowness-difference tomograms and zero-offset slowness profiles indicate that the VOE remained close to the injection wells, whereas radar attenuation profiles and electromagnetic induction logs indicate that bulk electrical conductivity increased down-gradient of the injection zone, diagnostic of changing water chemistry. Geophysical logs indicate that some screened intervals were located above or below zones of elevated dissolved solids; hence, the geophysical data provide a broader context for interpretation of water samples and evaluation of the biostimulation effort. Our results include (1) demonstration of field and data analysis methods for geophysical monitoring of VOE biostimulation and (2) site-specific insights into the spatial and temporal distributions of VOE at the ACP. 相似文献
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Pressure to decrease reliance on surface water storage has led to increased interest in aquifer storage and recovery (ASR) systems. Recovery efficiency, which is the ratio of the volume of recovered water that meets a predefined standard to total volume of injected fluid, is a common criterion of ASR viability. Recovery efficiency can be degraded by a number of physical and geochemical processes, including rate-limited mass transfer (RLMT), which describes the exchange of solutes between mobile and immobile pore fluids. RLMT may control transport behavior that cannot be explained by advection and dispersion. We present data from a pilot-scale ASR study in Charleston, South Carolina, and develop a three-dimensional finite-difference model to evaluate the impact of RLMT processes on ASR efficiency. The modeling shows that RLMT can explain a rebound in salinity during fresh water storage in a brackish aquifer. Multicycle model results show low efficiencies over one to three ASR cycles due to RLMT degrading water quality during storage; efficiencies can evolve and improve markedly, however, over multiple cycles, even exceeding efficiencies generated by advection-dispersion only models. For an idealized ASR model where RLMT is active, our simulations show a discrete range of diffusive length scales over which the viability of ASR schemes in brackish aquifers would be hindered. 相似文献
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对日本金矿脉和金—银脉状矿床中自然金和银金矿的化学成分进行了分析,并做出了总结。这两种类型矿床中自然金和银金矿的Ag/Au比值不同,在金矿脉中的Ag为10—20at%(原子百分数),在金—银脉中的Ag为30—70at%。热化学计算表明,自然金和银金矿的Ag/Au比值会随着氯化物含量及温度的增加而减小。这与自然金和银金矿的分析结果以及流体包体的研究一致。根据自然金和银金矿的Ag含量、闪锌矿的Fe含量以 相似文献
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近十年,由于黄金价格不断上涨,世界范围内的砂金勘探活动日趋频繁。砂矿常赋存于古河道和河床的凹陷处,往往被后来的侵蚀成因或冰川成因的砂土和砾石覆盖。使用高分辨率地球物理勘探技术,填制基岩和土壤层图,以增加寻找砂金工业矿床的可能性。基岩面常常是控制砂金矿形成的重要因素。 地面探测雷达(GPR)和地震测深法是两种相互辅助的高分辨率技术,可用来填制基岩起伏图及土壤层图。现代雷达探测设备在粗粒土壤中应用效果最佳,探测深度可达30米,所测绘的地层层位之空间分辨率>0.5米。地震折射的空间分辨率大大低于雷达, 相似文献