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In Halobacterium salinarum mutants containing either of the light-driven ion pumps bacteriorhodopsin (H(+)) or halorhodopsin (Cl(-)) as their only retinal protein, a decrease of irradiance in the absence of respiration causes a phototactic response. The conversion of the causal event, a decrease of proton motive force across the cell membrane, into a(More)
a r t i c l e i n f o Keywords: B2B marketing Citation analysis Author co-citation analysis Intellectual development The field of business-to-business (B2B) marketing has grown considerably in the past four decades. However the state of knowledge about its structure and evolution remains limited. Who are the key players and what are the key papers in B2B(More)
Myxococcus xanthus, a predatory soil bacterium, has long been used as a model organism to study bacterial gliding motility. Research has revealed that two fundamentally distinct motor systems power gliding in this bacterium: repeated extensions and retractions of pili mediate social or (S-) motility, whereas the motor powering adventurous or (A-) motility(More)
IN THE TITLE COMPOUND [SYSTEMATIC NAME: (7-methyl-4,6,6a,7,8,9-hexa-hydro-indolo[4,3,2-fg]quinoline-9-yl)methanol monohydrate], C(16)H(18)N(2)O·H(2)O, the non-aromatic ring (ring C of the ergoline skeleton) directly fused to the aromatic rings is nearly planar, with a maximum deviation of 0.659 (3) Å, and shows an envelope conformation. In the crystal,(More)
The fungus Claviceps purpurea grows on grasses and cereal grains and produces six predominant ergot alkaloids. These toxic substances undergo different transformation reactions during storage and cereal processing. One of these reactions is the addition of water to a double bond in the ergoline skeleton. Since light is required for this process, the(More)