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Research on Semiquantification of Lethal Toxin at the Bottom of Reactors for Clostridium sordellii Culture 梭状芽胞杆菌反应器底部致死毒素半定量研究
Pub Date : 2021-05-04 DOI: 10.9734/BPI/RPMB/V5/1923F
Diana P©rez-Etcheverry, A. Nieto-Cadenazzi, Iris Miraballes-Martnez
The production of Clostridium sordelli veterinary vaccine is prepared by culturing the microorganism in large industrial bioreactors and purifying the toxin from culture supernatants. Currently, the harvesting time is established as function of bacterial growth, but not always this moment is associated to the maximum concentration of toxin present in the supernatant. Thus, it is easy to find different total amounts of toxin produced batch to batch. Besides, at present the toxin concentration is measured by in vivo LD50 methods, and results can be obtained only after 72h, when the bioreactor was already stopped.Moreover, the method is labour intensive and requires the use of a significant number of experimental animals We describe the development of a latex agglutination reagent for semiquantification of Clostridium sordelli lethal toxin (TcsL) and its use in industrial bioreactors. The reagent was developed and characterized in our laboratory achieving a considerable low detection limit (8ng of toxin per ml of culture supernatant) and then it was validated in actual industrial conditions. The use of such a rapid (i.e, in minutes) and easy to use reagent will allowto followthe culture in real time and thus standardizing the optimal end-point for harvesting in terms of toxin quantity.As an immediate consequence, the efficiency of TcsL industrial production may be optimized.
索氏梭状芽胞杆菌兽用疫苗的生产是通过在大型工业生物反应器中培养梭状芽胞杆菌,并从培养上清中提纯毒素来制备的。目前,收获时间被确定为细菌生长的函数,但并不总是这个时刻与上清中存在的最大毒素浓度有关。因此,很容易找到不同批次产生的毒素总量。另外,目前毒素浓度的测定方法是体内LD50法,需要72h后才能得到结果,此时生物反应器已经停止。此外,该方法是劳动密集型的,需要使用大量的实验动物。我们描述了用于索氏梭状芽胞杆菌致死毒素(TcsL)半定量的乳胶凝集试剂的开发及其在工业生物反应器中的应用。该试剂是在我们的实验室开发和表征的,达到了相当低的检测限(每毫升培养上清中含有8ng毒素),然后在实际工业条件下进行了验证。使用这种快速(即几分钟内)且易于使用的试剂将允许实时跟踪培养,从而在毒素数量方面标准化最佳收获终点。直接的结果是,对外汉语工业生产的效率可能会得到优化。
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引用次数: 1
Proteomic Profile Analysis of Tomato (Solanum lycopersicum L.) Roots Under Salinity Stress 番茄(Solanum lycopersicum L.)蛋白质组学分析盐胁迫下的根系
Pub Date : 2019-01-01 DOI: 10.37532/tsbt.2019.15(6).197
A. Jalili, Nasser Abbaspor, L. Pourakbar, Nayer Mohamadkhani
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引用次数: 0
Integrated Biodiesel and Biogas Production from Chlorella sorokiniana: Towards a Sustainable Closed-Loop through Residual Waste Biodegradation 小球藻生物柴油和沼气的集成生产:通过残余废物生物降解实现可持续闭环
Pub Date : 2019-01-01 DOI: 10.37532/tsbt.2019.15(6).196
A. Mohamed, O. M. Salem, G. Klock, S. El-Enin
To date, more effort has been put towards biodiesel production using algal lipid, while less attention has been paid on biogas production. In this paper, we used the accumulated biomass of Chlorella sorokiniana cultivated under nitrogen stress in columns bioreactors with 120 L working volume to produce biodiesel from the extracted neutral lipids and biogas from the residual biomass. The accumulated neutral lipids were 14%, 17% and 21% for cultures containing 100%, 50% and 0.0% NaNO3 concentration respectively. The highest net accumulated methane yield was 315 ml g-1 volatile solids from the residual biomass after lipid extraction of the 50% NaNO3 culture. The fatty acid profile shows a significant increase of saturated fatty acids by 40.5% and 54.1% in nitrogen-deficient cultures 50% NaNO3 and 0.0% NaNO3 respectively and sharply decrease in poly-unsaturated fatty acids by 54.2% under complete deficiency of nitrogen (0.0% NaNO3). The percent of the produced biodiesel through trans esterification was 95% with high cetane value 61 and a high percentage of palmitic acid 37% which reflect high efficiency and stability of the produced biodiesel. The biomethane potential for microalgae (Chlorella sorokiniana) and macroalgae (Laminaria japonica) were 255 and 173 mL g-1 VS respectively under the same conditions.
迄今为止,更多的努力已经投入到使用藻类脂质生产生物柴油,而很少关注沼气的生产。本研究利用氮胁迫下sorokiniana小球藻积累的生物量,在工作体积为120 L的柱式生物反应器中提取中性脂,并从剩余生物量中提取沼气生产生物柴油。在NaNO3浓度为100%、50%和0.0%的培养基中,累积中性脂分别为14%、17%和21%。在50% NaNO3培养物的脂质提取后,剩余生物质中挥发性固体的最高净累积甲烷产量为315 ml g-1。脂肪酸谱显示,在50% NaNO3和0.0% NaNO3缺氮培养下,饱和脂肪酸显著增加40.5%和54.1%,而在完全缺氮(0.0% NaNO3)培养下,多不饱和脂肪酸急剧减少54.2%。反式酯化所得生物柴油的转化率为95%,十六烷值高达61,棕榈酸含量高达37%,反映了生物柴油的高效和稳定性。在相同条件下,微藻(小球藻)和大型藻(海带藻)的生物甲烷势分别为255和173 mL g-1 VS。
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引用次数: 1
Qualitative Analysis of Rhododendron arboreum Leaves Extracts using HPLC-ESI-QTOF-MS HPLC-ESI-QTOF-MS定性分析杜鹃叶提取物
Pub Date : 2019-01-01 DOI: 10.37532/tsbt.2019.15(6).198
D. Sharma, Janardan Lamichhane
Nepal has the richest source of herbal medicinal plants and high plant biodiversity even within the altitudinal variation of every100 meter. Based on the high biodiversity report cell-mediated the national flower of Nepal, Rhododendron arboreum (Smith), was collected from Palpa district of Nepal with an altitude of 1350 and phytochemical analysis was performed from its methanol extract. Basic Phytochemical analysis showed the presence of Alkaloids, Flavonoids Coumarins, and Saponins. Based on primary research output and the importance of the basic compounds the samples were further reanalyzed with HPLC-ESI and QTOF-MS. Thirteen different chemically important compounds from R. arboreum were identified by HPLC-ESI-QTOF-MS. Among them, Rhodolatouside A and Rhodolatouside B were first time reported as new compounds in Rhododendron arboreum from Nepal whereas Coumaric acid, Gallic acid, Rhodolatouside A, Leuco-pelargonidin, Rhodolatouside B, Myricetin, Hyperoside, Quercetin, Maslinic Acid, Linoleic acid, 1-Naphthalenepropanol, Octadecanoic acid, and Betulinic Acid/Ursolic acid were observed as previously reported compounds. All the compounds were identified with their molecular formula.
尼泊尔拥有最丰富的草药植物资源,即使在每100米的海拔变化范围内,植物生物多样性也很高。基于细胞介导的高生物多样性报告,尼泊尔国花杜鹃花(Rhododendron arboreum (Smith))采自海拔1350的尼泊尔帕尔帕地区,并对其甲醇提取物进行了植物化学分析。基本的植物化学分析显示其含有生物碱、类黄酮、香豆素和皂苷。根据初步的研究成果和基本化合物的重要性,进一步用HPLC-ESI和QTOF-MS对样品进行再分析。采用HPLC-ESI-QTOF-MS方法鉴定了13种不同的化学成分。其中,红柱头苷A和红柱头苷B为首次报道的尼泊尔杜鹃花新化合物,香豆酸、没食子酸、红柱头苷A、白杨苷、红柱头苷B、杨梅素、金丝桃苷、槲皮素、山茱萸酸、亚油酸、1-萘丙醇、十八烷酸、白桦酸/熊果酸为先前报道的新化合物。所有化合物都通过分子式进行了鉴定。
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引用次数: 1
Microorganisms of the Extreme Zones of the Southern Aral Sea Region 南咸海地区极端地带的微生物
Pub Date : 2016-01-01 DOI: 10.15192/pscp.sa.2017.20.1.813
A. Fatikhovich, K. Ivanovna, Zaynitdinova Lyudmila Ibrahimovna, Tashpulatov Javlon Jamondinovich
Development of microbial biota of the region of the Southern Aral Sea, which characterized by excessive aridity and salt concentration and presence of pesticides’ traces as well, was studied. It was established that analyzed natural microbial biota comprises sporogenous, ammonifying and oligonitrifying microorganisms as well. Nitrifying and denitrifying microorganisms were not revealed. Filamentous fungi belonging to genera Aspergillus, Penicillium, Cladosporium were isolated as well. At the same time, nitrifying and denitrifying microorganisms were isolated from arable soils, where humus content is higher. Strains of Azotobacter, resistant to mixture of pesticides, were isolated as well.
研究了南咸海地区过度干旱、盐浓度高、农药残留的微生物群发育情况。结果表明,所分析的天然微生物群包括孢子生微生物、氨化微生物和低氮硝化微生物。硝化和反硝化微生物未被揭示。还分离到了曲霉属、青霉属、枝孢菌属的丝状真菌。同时,从腐殖质含量较高的耕地土壤中分离出硝化和反硝化微生物。同时还分离出了对混合农药具有抗性的固氮菌菌株。
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引用次数: 1
Research on planning of the integration of urban and rural areas, and construction of landscape green space system, of Lucheng City 鹿城市城乡一体化规划与景观绿地系统建设研究
Pub Date : 2015-09-30 DOI: 10.14257/IJSH.2015.9.9.07
Weicheng Han, Tieying Li
Lucheng City has a long history, and now is the only county-level city which belongs to Shanxi Province. This city has a small population of people which are relatively concentrated. The economy of this city is based on the coal industry, which results in the fact that the secondary industry dominates while the primary and tertiary ones obviously fall behind. To respond to the call of our nation, which is that ‘balance the development between the urban and rural’, and to meet the needs of the urban development, it is essential to make some detailed strategies. Especially, the construction of the landscape green space system plays an important role in this process. This paper focuses on the drainage purposes of this system. In addition, to enhance this city’s drainage function, it is also demanding to optimize its drainage system, which in this paper we concentrate on the urban sewer system. In this paper, we apply two mathematical models into the drainage analysis and optimization, which are the soil water characteristic curve (SWCC) method and urban sewer system model (USSM), respectively.
鹿城历史悠久,是山西省唯一的县级市。这个城市人口少,而且相对集中。我市经济以煤炭产业为主,第二产业占主导地位,一、三产业明显落后。为了响应国家“统筹城乡发展”的号召,适应城市发展的需要,有必要制定一些具体的战略。特别是景观绿地系统的建设在这一过程中起着重要的作用。本文着重论述了该系统的排水目的。此外,为了增强城市的排水功能,对其排水系统进行优化也提出了更高的要求,本文将重点研究城市排水系统。本文将土壤水分特征曲线(SWCC)法和城市下水道系统模型(USSM)两种数学模型应用于排水分析与优化。
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引用次数: 0
Research of rolling shear motion laws based on improved PSO 基于改进粒子群算法的滚动剪切运动规律研究
Pub Date : 2015-06-30 DOI: 10.14257/IJCA.2015.8.6.11
Yugui Li, Yanxu Wei
Making pure rolling shear as the target, based on the principles analysis of shear mechanism in the rolling shear, trajectories of the overlap and the horizontal displacement of the upper blade during the cutting process are directly calculated out. And then the trajectories are optimized with improved natural selection-based particle swarm optimization algorithm (selPSO) deemed lengths of the key rods as variables. On this basis, motion laws of the driving links are reversely worked out through solving position equations of the rolling shear’s mechanism, which are nonlinear equations, with selPSO. The calculated results show that the synthetic horizontal translation (mean value of all horizontal displacement relating to calculated points) of the upper blade reduced by 34.96% and the overlap becomes a constant, which can realize the pure rolling cutting very well and improve the shear quality of the steel plate; selPSO is applicable to solve nonlinear equations in the project, which can overcome the problem of high sensitivity to initial value and improve the computational efficiency
以纯滚剪为目标,在对滚剪中的剪切机理进行原理分析的基础上,直接计算出剪切过程中上刀片的重叠轨迹和水平位移轨迹。然后以关键杆长度为变量,采用改进的基于自然选择的粒子群优化算法(selPSO)对轨迹进行优化。在此基础上,通过求解剪切机构的非线性位置方程,利用self - pso反求出驱动连杆的运动规律。计算结果表明:上刀片综合水平平移量(与计算点相关的所有水平位移的平均值)减小34.96%,重叠量趋于恒定,可以很好地实现纯轧制切割,提高钢板的剪切质量;selPSO适用于工程中求解非线性方程,克服了对初值高度敏感的问题,提高了计算效率
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引用次数: 2
An optimum mixture of virgin rice straw pulp and recycled old newsprint (ONP) pulp and their antimicrobial activity 原稻草浆与再生旧新闻纸(ONP)浆的最佳配比及其抑菌活性
Pub Date : 2015-01-28 DOI: 10.14716/IJTECH.V6I1.288
M. A. Nassar, H. M. E. Rahman, M.El Sahkawy
Recycled fibres are important sources for paperboard industry. There are various approaches to enhance the strength of recycled fibres. These approaches includemechanical treatment, chemical addition, and physical fractionation as well as blending with virgin fibres. In this study, two types of deinked old newsprint (ONP) pulp were subjected to blending with virgin fibres of rice straw. The ONP pulp was blended with rice strawpulp at 4 intervals ranging from0 to 100%addition. Itwas observed that blending ONP with rice strawpulp had enhanced the strength of the virgin fibre and vise versa. The modification of rice straw fibres was visually evaluated by scanning electron microscopy (SEM). It was observed that the addition of the flexible ONP pulp type2 seemed to fill up the voids in the paper sheet and created more bonding with rice straw fibres. Shrimps exoskeletons poweder, borax and cactus peel extract were added to paper board made from50%rice straw+50%ONP type2 pulp at percent of 2%based on oven dryweight pulp. The antimicrobial activity of each of these three additives was studied.
再生纤维是纸板工业的重要原料。有多种方法可以提高回收纤维的强度。这些方法包括机械处理、化学添加、物理分馏以及与原始纤维混合。本文研究了两种脱墨旧新闻纸(ONP)纸浆与稻草原纤维的共混。将ONP浆与稻草浆按添加量为0 ~ 100%的4次间隔进行混合。结果表明,与稻草浆共混可提高原纤维的强度,反之亦然。利用扫描电子显微镜(SEM)对秸秆纤维的改性进行了目视评价。我们观察到,2型柔性ONP纸浆的加入似乎填补了纸张中的空隙,并与稻秆纤维产生了更多的结合。将虾外骨骼粉、硼砂和仙人掌皮提取物添加到50%稻秆+50%ONP 2型纸浆的纸板中,以烘箱干重纸浆的2%为基础。研究了这三种添加剂的抑菌活性。
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引用次数: 9
Case Studies on Biofuel Supply Logistics for Forest Bioenergy in China 中国森林生物能源生物燃料供应物流案例研究
Pub Date : 2015-01-01 DOI: 10.1007/978-3-642-40660-7_183
Lan Zhang, Caihong Zhang, Liangzhen Zang
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引用次数: 0
Research on modeling and simulation of SI engine for AFR Control application 用于AFR控制的SI发动机建模与仿真研究
Pub Date : 2014-12-31 DOI: 10.2174/1874444301406010803
Mengqi Lei, Zeng Chunnian, L. Hong, L. Jie, L. Wen, L. Xianghua
Accurate AFR control with TWC is a significant method to reduce the exhaust emission of SI engines. To follow the modern model-based methodology in automotive industries, a virtual engine simulation platform have been carried out to simulate a SGMW B15 engine based on enDYNA by adding the AFR path dynamic models. Experiments and simulation results have been compared for the model validation both about the engine performance at steady state and AFR path transient response. Also a soft ECU model has been designed for the control algorithm implementation. Simulation results shows that the engine model is appropriate for simulating SI engine operated at steady and transient state, and the close-loop PID controller has better performance for suppressing the overshoot of AFR signal during transient throttle position varying. The simulation model described in this work could support the AFR control algorithm development as a proper virtual engine control objects
采用TWC精确控制AFR是减少发动机废气排放的重要手段。为了遵循现代汽车工业基于模型的方法,建立了基于enDYNA的虚拟发动机仿真平台,通过添加AFR路径动态模型对SGMW B15发动机进行仿真。对发动机稳态性能和AFR路径瞬态响应进行了实验和仿真对比,验证了模型的有效性。为实现控制算法,设计了软ECU模型。仿真结果表明,该发动机模型适用于稳态和瞬态工况下的发动机仿真,闭环PID控制器在抑制瞬态油门位置变化过程中AFR信号的超调性能较好。本文所描述的仿真模型可以作为一个合适的虚拟发动机控制对象来支持AFR控制算法的开发
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引用次数: 6
期刊
BioTechnology: An Indian Journal
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