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傅里叶变换红外光谱(Fourier transform infrared spectroscopy,FT-IR)是一种很有用的生物分析检测技术,通过FT-IR光谱技术可以得到有关蛋白质、脂类、核酸和多糖等微生物和细胞各类组成成分的信息。基于同步辐射光源的显微FT-IR光谱具有更高的空间分辨率和更快的测量速度,因而在生物学研究中具有进行快速、实时、动态和无损检测等优势。本文介绍了FT-IR光谱技术在微生物及电离辐射作用于微生物引起的生物学效应研究中的应用,并对该领域未来研究的发展趋势进行了展望。 相似文献
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电活性微生物具有独特的在细胞内外环境之间传递电子的能力。在对天然电活性微生物电子传递机制充分研究的基础上,通过合成生物学方法异源构建天然电活性微生物电子传递结构基础也可以将遗传背景清晰的非电活性大肠杆菌改造为电活性微生物。构建获得的工程化电活性大肠杆菌可以直接应用于微生物燃料电池和生物传感器等领域,同时也可以作为底盘细胞整合相应的目标产物合成通路实现电能驱动的生物合成。本文以合成生物学方法构建电活性大肠杆菌为主题,详细阐述天然电活性微生物电子传递的机理及结构基础,总结了工程化电活性大肠杆菌的构建策略、成功案例以及应用领域,并对合成生物学方法构建电活性大肠杆菌未来的研究方向进行了展望。 相似文献
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黄土高原典型植物根际对土壤微生物生物量碳、氮、磷和基础呼吸的影响 总被引:13,自引:0,他引:13
选择黄土高原7种典型植物的根际与非根际土壤为研究对象,对土壤的养分含量、微生物生物量碳、氮、磷和基础呼吸的影响进行了初步研究。结果表明,7种不同植物根际土壤与非根际土壤的养分含量、微生物生物量和基础呼吸均存在显著差异;除冷蒿的土壤微生物生物量磷以外,其他各种植物的根际土壤的养分含量、微生物生物量和基础呼吸均比非根际土壤的高;土壤有机碳、全氮与土壤微生物生物量碳、氮及基础呼吸之间均具有极显著或显著相关关系,表明了土壤微生物生物量碳、氮可以作为判断土壤肥力状况的生物学指标,同时也可为提高土壤肥力水平和土壤培肥效果提供依据。 相似文献
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丝状真菌作为低等真核生物,有典型的真核生物的细胞结构和遗传织组;作为微生物,又具有微生物在操作上的快速、简便,因此一向是生物学基础研究的重要材料。丝状真菌又是重要的工业生产用菌株和多种农作物的致病菌,这就更刺激了生物学家对研究丝状真菌的兴趣。 相似文献
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微生物降解持久性有机污染物的研究进展与展望 总被引:1,自引:0,他引:1
持久性有机污染物(POPs)是伴随着人类工业化发展而产生的合成类污染物,具有高毒性、持久性、长迁移性和高生物富集性等特点,POPs污染物的微生物降解一直是环境科学与技术应用领域的研究热点。微生物降解技术修复POPs污染环境具有无二次污染、成本低、快速简便等优点,拥有广泛的应用前景。本文论述了各种POPs微生物分解代谢的最新研究进展,包括降解性微生物资源以及降解机制。此外,还讨论了计算生物学、合成生物学、基因组学等技术在POPs微生物降解中的潜力和应用,以期为环境中持久性有机污染物的修复提供参考。 相似文献
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湖北地区已知蜱类及区系分析 总被引:13,自引:0,他引:13
湖北地区已知蜱类计有6属26种,其中属东洋界种类15种,占57.7%;属古北界种类8种,占300.8%;广布界种类3种,占11.5%。分析认为,湖北地区蜱类区系应划归东洋界。 相似文献
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The distribution of surnames for births, marriages and deaths in 1976 among residents of the 12 Local Government Regions of Scotland was analyzed in terms of the coefficient of relationship by isonymy, Ri. Differences between sexes and events for Ri within Regions were consistent with greater inter-Region mobility among males compared with females and among young adults compared with the elderly. There were near zero correlations of geographical distance with Ri between Regions based on all surnames or common surnames. With Ri based on rare surnames, there was a small though statistically nonsignificant negative correlation. The best-fitting two dimensional relationship derived from Ri values based on rare surnames showed a fair correspondence with the map of Scotland, indicating a degree of genetic isolation between the Regions. 相似文献
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V N Sorokin 《Biofizika》1975,20(4):715-719
Analyzing the control quality in autonomic contour of articulation control system an account is made for the nonlinearities of the type of the zone ofunsensitivity, limitation and logarithmic response of the receptor. Regions of stablity and autooscillation frequency are determined. The role of recontrolling value is stated as a criterion of the control quality. It is suggested that the mechanisms of some stammering forms are concerned with the initiation of autooscillations in the articulation control system. 相似文献
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Susan Carter 《Nordic Journal of Botany》1992,12(4):403-421
Eighteen new species of Euphorbia subgenus Euphorbia are described and their relationships discussed. All are endemic to Somalia, with limited distributions in the northern Regions. One, E. phillipsioides , has been identified mistakenly for some time as E. phillipsiae , which is shown to be conspecific with E. golisana. E. xylacantha , considered by N. E. Brown to be synonymous with E. monacantha , is reinstated as a distinct but variable species. 相似文献
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Recent approaches have failed to detect nucleotide sequence motifs in Scaffold/Matrix Attachment Regions (S/MARs). The lack
of any known motifs, together with the confirmation that some S/MARs are not associated to any peculiar sequence, indicates
that some structural elements, such as DNA curvature, have a role in chromatin organization and on their efficiency in protein
binding. Similar to DNA curvature, S/MARs are located close to promoters, replication origins, and multiple nuclear processes
like recombination and breakpoint sites. The chromatin structure in these regulatory regions is important to chromosome organization
for accurate regulation of nuclear processes. In this article we review the biological importance of the co-localization between
bent DNA sites and S/MARs.
Published in Russian in Biokhimiya, 2006, Vol. 71, No. 5, pp. 598–606. 相似文献
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M.S. Al-Khalifa H.S. Hussein F.M. Diab G.M. Khalil 《Saudi Journal of Biological Sciences》2009,16(2):63-67
Blood samples from camels, sheep, goats and cattle from six Regions in Saudi Arabia were examined for blood parasites. Asir Region camels were disinfected while those of the Eastern, Jazan, Northern Frontiers, Riyadh and Tabouk Regions were infected with Trypanosoma evansi (5–40%), those of Riyadh and the Eastern Regions were infected with Dipetalonema evansi (1–6%) and those of the Eastern, Jazan and Riyadh Regions were infected with Eperythrozoon species (8–20%). Sheep and goats of all tested regions were infected with Theilaria hirci (4–20% and 6–14%, respectively), Theilaria ovis (5–19% and 6–24%, respectively) and Eperthrozoon ovis (2–9% and 2–8%, respectively). Sheep of the Eastern and Northern Frontiers Regions were also infected with Anaplasma ovis (2%) and also those of the Eastern Region were infected with Babesia motasi (4%) as well. Cattle of Asir and Eastern Regions were infected with Anaplasma marginale (1–3.4%) and those of the Eastern, Jazan and Riyadh Regions were infected with Theileria annulata (11.3–25%) and Eperthrozoon wenyoni (1–4%). Moreover, Jazan cattle were infected with Babesia bigemina (6%) and a benign Theileria species (27%). Some of these parasites are recorded in new localities indicating that they are spreading in the country. Also, this is the first report in Saudi Arabia of D. evansi in camels, A. ovis and B. motasi in sheep and A. marginale and B. bigemina in cattle. These parasites may be introduced into the country with infected livestock infested with the vectors of these parasites. The suspected vectors of the detected parasites in Saudi Arabia is discussed. Follow up surveys of blood parasites are recommended to assess their distribution and infection rates in the livestock of all Regions of Saudi Arabia, to make plans for control measures against their vectors. 相似文献
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J. Dixon 《BMJ (Clinical research ed.)》1994,308(6931):772-775
Most regional health authorities set budgets for fundholding practices according to the amount of care used by the practice population. This article explains why this funding method can only lead to an inequitable allocation of resources between fundholding and non-fundholding practices. Using the experience of North West Thames region, the efforts made to make funding fairer are discussed. The steps that health authorities could take to investigate and reduce the problem are also outlined. In the absence of a capitation formula for funding fundholding practices, the paper suggests that health authorities should do much more to investigate the amount of money they spend on non-fundholding practices. Regions could develop and use other methods to set budgets rather than rely on activity recorded by practices. Regions and the Department of Health should resolve urgently if and how far the budgets for fundholders should be compensated for increases in provider prices. 相似文献