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刘平 《精细与专用化学品》2003,(Z1)
上海市农药研究所顺利完成了“金核霉素中试”项目。不久前在沪通过专家鉴定。 该项目是上海市科技兴农重点攻关项目。金核霉素作为一种研制成功的新型农用杀菌抗生素,是 相似文献
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新颖微生物源杀菌剂——金核霉素 总被引:1,自引:0,他引:1
金核霉素系由上海市农药研究所发现并开发的微生物源杀菌剂,它由金色链霉菌苏州变种(Streptomyces aureus var.suzhoueusis n.var Yen et al)经培养发酵而得,并通过了大量的田间药效试验及安全性试验,确认了该药剂作为农用杀菌剂对多种细菌病害的优异效果及对人畜与环境的安全性。共94%原药及30%可湿性粉剂已于2003年6月获得我国农业部的临时登记。 相似文献
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微生物发酵法制备梅岭霉素 总被引:3,自引:0,他引:3
梅岭霉素与阿维菌素和伊维菌素具有相同的母核结构,并具有强烈的杀螨、杀虫和驱虫效果,其产业化研究已被列入国家“十五”攻关项目。梅岭霉素和南昌霉素都是南昌链霉素的发酵产物,经菌种选育,得到一种仅高产梅岭霉素的菌株。优化后的发酵水平在50L发酵罐中达到400ug/ml。通过对萃取条件的优化,梅岭霉素收率达到85%。 相似文献
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应用原生质体诱变技术筛选井冈霉素高产菌种的研究 总被引:8,自引:0,他引:8
诱变育种是抗生素菌种选育中最常规而又最有效的方法,对微生物原生质体进行诱变育种是目前人们为获取高产菌种和保持高产菌种特性的一种行之有效的方法。本文研究井冈霉素产生菌原生质体制备及再生条件,并通过对原生质体进行紫外线诱变处理,筛选得到井冈霉素高产菌种PU-922,摇瓶发酵水平可达到每毫升26 586单位(以A组份计,补足蒸发量后数据,下同),比出发菌株提高34.5%。 1 材料与方法 1.1 菌株 井冈霉素产生菌UV-199,浙江钱江生物化学股份有限公司菌种室提供。 1.2 培养基及试剂 1.2.1 斜面及培养基 葡萄糖1.0%,L-天冬… 相似文献
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井冈霉素高产菌种的选育 总被引:5,自引:0,他引:5
井冈霉素是一种在井冈山地区发现的微生物菌株所产生的农用抗生素 ,对水稻纹枯病有显著的防治效果 ,药效达 90 %以上。虽然从井冈霉素发现迄今已有 30年 ,但由于其具有高效、低毒 ,对环境安全 ,以及尚未发现抗药性 ,因而该产品仍拥有一个稳定的市场。但是多年以来井冈霉素的发酵生产水平一直徘徊在 1 0 0 0 0~ 1 2 0 0 0r/mL(以A组份计 ,下同 ) ,我们以本公司的井冈生产菌种为出发菌种 ,用紫外线进行诱变处理 ,筛选出了发酵效价稳定的高产菌株UV 1 99,摇瓶发酵效价可达到 2 0 0 1 5r/mL(补足摇瓶蒸发水份后测得 ) ,比出发菌株 1 4 1 5 8r… 相似文献
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《Ceramics International》2022,48(11):15334-15347
This paper aims to improve machining efficiency, suppress surface cracking, and reduce subsurface damage of silicon carbide (SiC). Hydrogen ions were implanted into SiC to study mechanical properties at nano and macro scales. Nanoindentation experiments were conducted using a Berkovich indenter. Firstly, the effect of ion implantation on the load-displacement curves at different indentation depths was investigated using molecular dynamics (MD) simulations. Elastic-plasticity at nanoscale was analyzed, and the values of material properties were obtained. Secondly, variability of surface morphology, phase transformation, and coordination number induced by nanoindentation with and without ion implantation was evaluated. Although ion implantation induced damage to the SiC model, the damage after nanoindentation was lower than that without ion implantation. Additionally, nanoindentation experiments were performed for small loads and high loads, respectively. The small load experiments were employed to derive material properties of the ion-implanted SiC. Improvement mechanisms of ion implantation on crack extension, fracture toughness, and elastic recovery rate were investigated under the high-load experiments. The results indicate that the amorphous structure induced by ion implantation can successfully prevent crack propagation and improve fracture toughness. The modification technology of SiC by ion implantation significantly improves the machining efficiency and the non-damage of its surface and subsurface. 相似文献
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丙酮-丁醇发酵生产菌的快速筛选方法 总被引:8,自引:0,他引:8
建立了高效丙酮-丁醇生产菌的快速筛选方法,采用氮离子注入诱变技术选育丙酮-丁醇发酵生产菌,以2-脱氧-D-葡萄糖作为抗代谢阻遏物,筛选高淀粉酶活性的突变株. 首次根据丙酮-丁醇发酵代谢途径中先产酸后产溶剂及高活力厌氧发酵细胞具有较强还原力的特点,设计了溴甲酚绿和刃天青2种筛选平板,所筛突变株经发酵验证丁醇和总溶剂产生能力均有显著提高,I4-28突变菌株总溶剂产量和丁醇产量分别较出发菌株提高了27.96%和40.66%,丁醇/总溶剂比由63.39%提高到71.94%,突变菌株具有较好的传代稳定性. 相似文献
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嗜热L-乳酸高产菌株的选育 总被引:1,自引:0,他引:1
采用高糖和平板快速筛选法从各种土壤、草料、温泉水中分离得到89株产乳酸的菌株,经过低糖与高糖的复筛,并结合高效液相色谱进行产物定量与光学纯度的检测,筛选到3株最适生长与发酵温度为50℃和55℃的L-乳酸高产菌S-18、S-32和S-44,该3株菌从100 g/L葡萄糖出发,72 h时产酸能力分别达到75.0 g/L、81.9 g/L 和86.5 g/L,光学纯度分别达到96.3%、96.6% 和97.7%。对其中产量最高的S-44进行离子注入诱变,获得多株高产菌,其中Y-4从200 g/L葡萄糖出发,产酸能力达到178.7 g/L,对糖转化率达到89.4%,为进一步的开发奠定了基础。 相似文献
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应用离子注入技术,对能转化左旋乙基甾烯双酮为15α-羟基左旋乙基甾烯双酮的雷斯青霉(Penicillium raistrickii)进行研究,旨在提高其C15α位羟化能力。结果表明,雷斯青霉存活率曲线呈典型的"马鞍型",通过液相色谱分析,在N^+注入剂量为50×10^14ions·cm^-2时可引起较高的正突变率,并从中获得一突变株,其15α-羟基左旋乙基甾烯双酮转化率达到62.7%,为出发菌株的1.16倍。 相似文献
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A. JIMENEZ-MORALES J. C. GALVAN R. RODRIGUEZ J. J. DE DAMBORENEA 《Journal of Applied Electrochemistry》1997,27(5):550-557
Electrochemical impedance spectroscopy (EIS) and d.c polarization resistance measurements (Rp) were used to study the corrosion resistance of surface layers produced by nitrogen ion implantation into copper substrates. Ion implantation was carried out using a Wickham ion beam generator, applying an acceleration voltage of 100keV, a mean current of 0.40 mA and a nitrogen dosage of 4 × 1017 ions cm–2. Surface analyses were made by Auger electron spectroscopy (AES). Electrochemical measurements (EIS and Rp) performed in a 0.6m sodium chloride solution show nitrogen-implanted specimens have greater a.c. and d.c. apparent polarization resistance than nonimplanted specimens. The results obtained with electrochemical measurements indicate that nitrogen ion implantation in copper forms a protective surface layer which improves the corrosion resistance of the pristine material, a feature of great interest for the design of new contact materials for the electricity and electronic industries. 相似文献
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The changes in the structural and electrical properties of nylon-6 films after implantation with an inert gas ion such as Ar+, with energy of 285keV and at different dose rates (1014 to 1017 ions cm-2), have been investigated. The conductivity, calculated using the projected range as the thickness of the implanted layer, increases by about four to five orders of magnitude for a dose rate of 5×1015 ions cm-2. This is the result of the formation of dangling bonds and free radicals due to implantation. The concentration of free radicals at room temperature measured using an electron spin resonance spectrometer shows that it is proportional to the dose rate up to a certain value, beyond which irradiation-induced damage sets in. The Fourier transform infra-red absorption spectra of the samples indicate certain structural changes due to ion implantation. © of SCI. 相似文献