基于pH的反馈补料方法在谷氨酸发酵中的应用

为简化谷氨酸发酵补料工艺,提出了一种新型的基于pH的补料方式。考察谷氨酸发酵过程中氨消耗量(x)和糖消耗量(y)发现,两者之间存在较好的线性关系(y=7.4744x,R2=0.9989),以此为pH反馈补料工艺中补料液中葡萄糖与氨的混合比例,能较好地将谷氨酸发酵过程中葡萄糖浓度稳定在12~21 g/L。比较恒定葡萄糖浓度补料工艺与pH反馈补料工艺发现,采用pH反馈补料工艺进行发酵,葡萄糖转化率、谷氨酸产酸速率分别提高了9.06%和17.5%左右,同时发酵周期缩短2 h以上

一种插层聚合纳米复合材料的调堵特性研究

Aiming at higher requirement on profile and shutoff agent, the allyl monomer and clay as well as selfmade inlayer dressing agent CTS and chain extender are formed to nanocomposites via polymerization. Its properties is evaluated. It behaves those performance as follows. Under the condition of 80 ∼ 140 °C and aging for 30 days, there is little change of break stress;under the condition of 140 °C, the variance ratio of break stress is only 3.2%; this kind of system is not sensitive to salinity; the viscosity of basic liquid is 39.54 mPa · s; under the condition of fracture, the block strength is 23.6 MPa, the pressure gradient is 0.393 MPa/cm, the sealed ratio is 98%; recovery ratio can increase 5% compared with that of water flooding. It shows the material is of high temperature resistance and salt tolerance, low injection pressure and strong shutoff capacity. The contradiction between injection and shutoff performance is resolved successfully

伊犁河流域农牧交错带防护林营建技术研究及生态建设示范

1、项目的主要技术内容： ①选择流域重点区,进行林业生态示范工程建设。 ②开展优良树种选择和林农草优化组合配置试验,构建适宜当地的防护林建设技术集成模式。 ③进行人为干扰下的半荒漠草地恢复建设试验, 提出草地恢复措施。 ④进行伊犁河流域林业生态建设规划。 2、项目主要技术指标： ①流域重点防护林和林业生态建设试验示范技术指标： a、重点防护林和林业生态建设造林25000亩,其中核心示范区1500亩,林木成活率达到85﹪以上; b、选择适宜当地的优良树种; c、选择适宜当地水土保持型防护林结构配置技术; d、选择适宜当地草地恢复..

新疆人口地域系统理论与方法体系研究

新疆人口地域系统的理论和方法体系研究是横向和纵向两方面项目资助完成的综合性研究,一方面是和新疆有关厅局委、地州等合作的横向项目,具体包括：受新疆人口和计划生育委员会委托完成的“新疆人口发展战略研究”、“新疆人口发展功能区研究”,自治区建设厅委托的“新疆小城镇发展战略研究”;自治区发改委委托的“小城镇经济发展战略研究”子专题“小城镇人口预测及其承载力研究”以及地州、县级、乡等城镇体系规划、村镇体系规划、新农村建设规划等都涉及到区域人口发展的项目。另一方面是纵向的中国科学院知识创新工程重点项目专题“城市化空间形态的资源环境效应研究”、中国科学院“西部之光”人才培养计划项目“天山北坡绿洲城镇化进程中..

新疆阜康盐碱地可培养兼性嗜碱放线菌多样性及其酶活筛选/Biodiversity and enzymes of culturable facultative-alkaliphilic actinobacteria in saline-alkaline soil in Fukang, Xinjiang[J]

[目的]分析新疆阜康盐碱地环境可培养兼性嗜碱放线菌物种多样性及其产酶潜力.[方法]从阜康盐碱地环境共采集10份土样,采用纯培养物的16S rRNA基因序列同源性分析盐碱地兼性嗜碱放线菌物种多样性.对分离菌株进行淀粉酶、蛋白酶、纤维素酶和木聚糖酶酶活初筛.[结果]从10份土样中共分离到116株兼性嗜碱放线菌和4株耐碱放线菌,16S rRNA基因序列分析表明它们分布在放线菌门放线菌纲的8个目13个科22个属,其中53.3％的菌株为非链霉菌属和拟诺卡氏菌属的菌株.酶活初筛结果:淀粉酶、蛋白酶、木聚糖酶和纤维素酶的阳性率分别为35.8％、37.5％、28.3％、17.5％.[结论]阜康盐碱地生境蕴藏丰富的兼性嗜碱放线菌资源.兼性嗜碱放线菌是获得高活性酶的资源.本研究有助于认识高碱环境兼性嗜碱放线菌的多样性,为其资源的开发利用提供依据

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies