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排序方式: 共有417条查询结果,搜索用时 15 毫秒
411.
Siju Kankalil George M.R. Suseela Saleh El Safi Elmoeiz Ali Elnagi Yaser A Al-Naam Ahmed Adlan Mohammed Adam Ashly Mary Jacob Thekra Al-Maqati Harish Kumar KS 《Saudi Journal of Biological Sciences》2021,28(5):2895-2899
Vancomycin-resistant enterococci (VRE) poses a formidable challenge to public health due to its inherent resistance to multiple antibiotics coupled with the ability to transfer genetic determinants to dangerous pathogens like Methicillin-resistant Staphylococcus aureus (MRSA). The purpose of this study was to investigate the incidence of vancomycin resistance in enterococci among clinical isolates at a tertiary care military hospital in the eastern region of Saudi Arabia and to detect van genes using multiplex-PCR. Overall, 246 isolates of enterococci were collected from various clinical specimens. The isolates were identified, and antimicrobial susceptibility testing was done using the Vitek 2 system. Multiplex PCR was performed on the VRE isolates, thus identified to determine the van genes harbored. A total of 15 VRE were identified, of which 14 (93.3%) were Enterococcus faecium, and 1(6.7%) was Enterococcus casseliflavus with intrinsic vanC resistance. Of the 14 vancomycin-resistant Enterococcus faecium, 8 (57.1%) harbored vanB genes, while 6 (42.8%) harbored vanA genes. All the VRE were susceptible to linezolid and tigecycline. Our study detected a low prevalence (6.1%) of VRE among clinical isolates of enterococci and that the vanB gene predominates in such strains. Susceptibility profiles indicated that linezolid and tigecycline are still effective against these multidrug-resistant pathogens. Pus specimens yielded the highest percentage (53.3%) of isolates from which VRE was obtained, and this finding is novel among studies done in Saudi Arabia. 相似文献
412.
Eun-A Jo Rajesh Kumar Tewari Eun-Joo Hahn Kee-Yoeup Paek 《Plant Cell, Tissue and Organ Culture》2009,96(3):307-315
Plantlets of Alocasia amazonica were regenerated on the MS medium supplemented with different concentrations (0–9%) of sucrose. An absence of sucrose in
the growth medium induced generation of leaves, however, it decreased multiplication. On contrary, sucrose supply of 6% or
9% enhanced multiplication but hampered photoautotrophic growth (generation of leaves). Increasing sucrose supply also increased
sugars and starch content and number of stomata and decreased water potential and size of stomata during in vitro growth period.
During ex vitro acclimatization, shoot length, root length, leaf number and root number of Alocasia plantlets grown with 3% sucrose, were found to be better among the other studied sucrose concentrations. Under ex vitro acclimatization,
number of stomata, contents of various carbohydrates in the leaves were increased but size of stomata decreased with increasing
sucrose supply during in vitro growth period. Moreover, water potential of leaves of plantlets, which have been grown with
a sucrose concentration other than 3%, was decreased. During in vitro growth, net CO2 assimilation rate (PN), transpiration (E), stomatal conductance (gs) and variable fluorescence to maximum fluorescence ratio (Fv/Fm) were unaffected, however, during acclimatization these were
changed and maximum PN, E, and gs were observed in the plantlets micropropagated with 3% sucrose. Fv/Fm was decreased severely in the plantlets micropropagated
with 6% sucrose during acclimatization. Thus a sucrose concentration of 3% in the medium is appeared to be better among studied
concentrations for both in vitro growth and ex vitro acclimatization of A. amazonica plantlets. 相似文献
413.
Il-Hoon Cho Sung-Min Seo Eui-Hwan Paek Se-Hwan Paek 《Journal of chromatography. B, Analytical technologies in the biomedical and life sciences》2010,878(2):271-277
Immunogold–silver staining (IGSS) was adopted in cross-flow chromatographic analysis in which immunological reactions and silver intensification were sequentially conducted in the vertical and horizontal directions, respectively. Factors controlling the performance, except the silver substrate solution, were optimized to increase the signal-to-background ratio in measurements of cardiac troponin I as a model analyte. In generating the signal, the size of colloidal gold catalyst was critical; the smallest size (5-nm diameter) in the selected range yielded the highest colorimetric signal. To maintain the low background, two processes, blocking the remaining surfaces of membrane after antibody immobilization and washing the residual tracer after immunological reaction, were necessary. Self-nucleation of silver ions also caused a background signal and was controlled to some degree by decreasing the hydrodynamic force that arose when the substrate solution was supplied in the horizontal direction. Finally, a new chip (IGSS-on-a-chip; IOC) that allowed for convenient, efficient IGSS was produced by injection molding of plastic. This method enhanced the detection capability by 51-fold compared to the conventional rapid test kit using 30 nm-sized colloidal gold as the tracer. The IOC biosensor results also showed that silver intensification yield via cross flow after immunological reaction was 19% higher than that by traditional incubation. 相似文献
414.
415.
Samhita S Rhodes Amadou KS Camara Kristina M Ropella Said H Audi Matthias L Riess Paul S Pagel David F Stowe 《Biomedical engineering online》2006,5(1):16-14
Background
The phase-space relationship between simultaneously measured myoplasmic [Ca2+] and isovolumetric left ventricular pressure (LVP) in guinea pig intact hearts is altered by ischemic and inotropic interventions. Our objective was to mathematically model this phase-space relationship between [Ca2+] and LVP with a focus on the changes in cross-bridge kinetics and myofilament Ca2+ sensitivity responsible for alterations in Ca2+-contraction coupling due to inotropic drugs in the presence and absence of ischemia reperfusion (IR) injury. 相似文献416.
417.
CO2-Enrichment and photosynthetic photon flux affect the growth of in vitro-cultured apple plantlets
Ru Yu Li Hosakatte Niranjana Murthy Seon Kyu Kim Kee Yeoup Paek 《Journal of Plant Biology》2001,44(2):87-91
Micro-cuttings (shoots with two small leaves) of cultivar M9 apple were cultured in-vitro for 40 d under CO2-enriched and non-enriched (i.e., ambient air) conditions, and at a PPF of 40 or 100 μmol m-2 s-1 Afterward, shoot length, number of leaves, leaf area, chlorophyll content, shoot and root fresh weights, and % survival were
recorded. Those plant-lets grown under CO2- and PPF-enriched treatments were healthy and vigorous, and showed higher values for their growth parameters. In contrast,
those grown without supplemental CO2 or PPF often showed hyperhydricity. We also demonstrated that CO2 enrichment and a relatively high PPF during in-vitro culture promoted normal photosynthesis and growth after ex-vitro transplantation. 相似文献