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Biological nitrogen fixation is a complex process requiring multiple genes working in concert. To date, the Klebsiella pneumoniae nif gene cluster, divided into seven operons, is one of the most studied systems. Its nitrogen fixation capacity is subject to complex cascade regulation and physiological limitations. In this report, the entire K. pneumoniae nif(More)
PURPOSE To evaluate the variation in macular retinal thickness and volume in young Chinese myopic patients using time-domain optical coherence tomography (Stratus TD-OCT) and spectral-domain optical coherence tomography (Cirrus HD-OCT). METHODS Ninety-two eyes of 92 myopic subjects were recruited in this study. Based upon spherical equivalence (SE),(More)
BACKGROUND To evaluate the influence of corneal astigmatism (CA) on retinal nerve fiber layer (RNFL) thickness and optic nerve head(ONH) parameters measured with spectral-domain optical coherence tomography (OCT) in high myopes patients before refractive surgery. METHODS Seventy eyes of 35 consecutive refractive surgery candidates were included in this(More)
Lactococcus lactis—a food-grade nonpathogenic lactic acid bacterium—is used widely in the food industry. In this report, we describe an approach to construct deficient strains in L. lactis utilizing the λ-Red recombination system. Three kinds of recombinant proteins, λ exonuclease, β protein and γ protein, were induced by l-arabinose in L. lactis MG1363(More)