366 research outputs found

    A two-dimensional electrophoresis protocol suitable for Medicago truncatula leaf proteome

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    Medicago truncatula leaves were used as the experimental materials. Total proteins of leaves were extracted by trichloracetic acid (TCA)-acetone method and proteins had a better separation using gel strips, forming an immobilized non-linear 3 to 10 pH gradient focusing 123,000 vhr combined with 12% sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The gels were stained with Coomassie Brilliant Blue G-250 and digitalized gels were analyzed using the PDquest 8.0.1 software. The results indicated that 931 protein dots were detected in the gel. A technology suitable for the M. truncatula leaves protein extraction by TCA/acetone and a protocol for two-dimensional electrophoresis (2-DE) was established, which provides technical support for M. truncatula leaf proteome research.Keywords: Medicago truncatula, proteome, two-dimensional polyacrylamide gel electrophoresis (2-DE), isoelectrofocusing (IEF)African Journal of Biotechnology Vol. 12(3), pp. 233-23

    Experimental investigation about the influence of airflow on droplet sizes of mechanical nozzles for coal mining face

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    Visokotlačno raspršivanje je jedna od primarnih metoda za sprječavanje prašine u potpuno mehaniziranom iskopu, a učinci raspršivanja mehaničkih mlaznica značajno utječu na učinak raspršivanja. Do sada su mlaznice uglavnom odabirane subjektivnom proizvoljnošću tehničara, utječući na poboljšanje učinka suzbijanja prašine. Iz tog razloga, prije i poslije simulacije stvarne brzine zraka iskopa ugljena, provedeni su usporedni pokusi učinaka atomizacije na šest vrsta najčešće korištenih mehaničkih mlaznica s vlastitom platformom za prskanje. Na osnovu podataka o ispitivanju dobivene su prosječne veličine kapljica i redoslijed kvalitete raspršivanja različitih mehaničkih mlaznica, a osim toga je induciran utjecaj turbulencije protoka zraka na veličine kapljica. Konačno, prema eksperimentalnim rezultatima, mlaznice koje se koriste u vanjskom raspršivaču su odabrane za #10310 radnih iskopa rudnika ugljena Xinglongzhuang u Kini, koji je postigao velike učinke smanjenja prašine.High-pressure spraying is one of the primary methods for dust prevention in coal mine fully mechanized caving face, and the atomization effects of mechanical nozzles influence dedusting result significantly. While so far, the nozzles are selected by technician’s subjective arbitrariness mainly, affecting improving dedusting effect. For this reason, before and after simulating actual air velocity of coal workface, the comparative experiments on the atomization effects of the six kinds of commonly used mechanical nozzles were conducted with self-designed spraying platform. Based on the test data, the average droplets’ size and the atomization quality order of different mechanical nozzles were obtained, moreover, the airflow’s turbulence influence on droplets’ sizes was induced. Finally, according to the experimental results, nozzles used in external spray of shearer were selected for #10310 working face of Xinglongzhuang coal mine in China, which had achieved great dust reduction effects

    Characterization of Human Coronavirus Etiology in Chinese Adults with Acute Upper Respiratory Tract Infection by Real-Time RT-PCR Assays

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    BACKGROUND: In addition to SARS associated coronaviruses, 4 non-SARS related human coronaviruses (HCoVs) are recognized as common respiratory pathogens. The etiology and clinical impact of HCoVs in Chinese adults with acute upper respiratory tract infection (URTI) needs to be characterized systematically by molecular detection with excellent sensitivity. METHODOLOGY/PRINCIPAL FINDINGS: In this study, we detected 4 non-SARS related HCoV species by real-time RT-PCR in 981 nasopharyngeal swabs collected from March 2009 to February 2011. All specimens were also tested for the presence of other common respiratory viruses and newly identified viruses, human metapneumovirus (hMPV) and human bocavirus (HBoV). 157 of the 981 (16.0%) nasopharyngeal swabs were positive for HCoVs. The species detected were 229E (96 cases, 9.8%), OC43 (42 cases, 4.3%), HKU1 (16 cases, 1.6%) and NL63 (11 cases, 1.1%). HCoV-229E was circulated in 21 of the 24 months of surveillance. The detection rates for both OC43 and NL63 were showed significantly year-to-year variation between 2009/10 and 2010/11, respectively (P<0.001 and P = 0.003), and there was a higher detection frequency of HKU1 in patients aged over 60 years (P = 0.03). 48 of 157(30.57%) HCoV positive patients were co-infected. Undifferentiated human rhinoviruses and influenza (Flu) A were the most common viruses detected (more than 35%) in HCoV co-infections. Respiratory syncytial virus (RSV), human parainfluenza virus (PIV) and HBoV were detected in very low rate (less than 1%) among adult patients with URTI. CONCLUSIONS/SIGNIFICANCE: All 4 non-SARS-associated HCoVs were more frequently detected by real-time RT-PCR assay in adults with URTI in Beijing and HCoV-229E led to the most prevalent infection. Our study also suggested that all non-SARS-associated HCoVs contribute significantly to URTI in adult patients in China

    O-GlcNAcylation of G6PD Promotes the Pentose Phosphate Pathway and Tumor Growth

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    The pentose phosphate pathway (PPP) plays a critical role in macromolecule biosynthesis and maintaining cellular redox homoeostasis in rapidly proliferating cells. Upregulation of the PPP has been shown in several types of cancer. However, how the PPP is regulated to confer a selective growth advantage on cancer cells is not well understood. Here we show that glucose-6-phosphate dehydrogenase (G6PD), the rate-limiting enzyme of the PPP, is dynamically modified with an O-linked b-N-acetylglucosamine sugar in response to hypoxia. Glycosylation activates G6PD activity and increases glucose flux through the PPP, thereby providing precursors for nucleotide and lipid biosynthesis, and reducing equivalents for antioxidant defense. Blocking glycosylation of G6PD reduces cancer cell proliferation in vitro and impairs tumor growth in vivo. Importantly, G6PD glycosylation is increased in human lung cancers. Our findings reveal a mechanistic understanding of how O-glycosylation directly regulates the PPP to confer a selective growth advantage to tumours
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