William Arnold

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Measurements of photosynthesis were made in continuous and flashing light of high intensity, using cells varying in chlorophyll content. The amount of chlorophyll present per molecule of carbon dioxide reduced per single flash of light was found to be about 2480 molecules. The length of time required for one unit in the photosynthetic mechanism to complete(More)
Experiments on photosynthesis in intermittent light have been made on two occasions. Brown and Escombe, in 1905, made use of a rotating sector to study the effect of light intensity on the photosynthesis of leaves. They found three-quarters of the light from a given source could be cut out in each revolution of the sector without decreasing the rate of(More)
BACKGROUND The consequences of a staple-line leak or disruption can be devastating particularly in the bariatric surgery population. This study was designed to assess if gastrointestinal staple-lines buttressed with bovine pericardium could tolerate greater intraluminal pressures compared with non-reinforced staple-lines. METHODS A laparoscopic linear(More)
OBJECTIVE Idiopathic peripheral neuropathy is common and likely due to genetic factors that are not detectable using standard linkage analysis. We initiated a candidate gene approach to study the genetic influence of the small heat shock protein (sHSP) gene family on an axonal motor and motor/sensory neuropathy patient population. METHODS The promoter(More)
1. Green plants have been found to emit light of approximately the same color as their fluorescent light for several minutes following illumination. This light is about 10(-3) the intensity of the fluorescent light, about one-tenth second after illumination below saturation or 10(-6) of the intensity of the absorbed light. 2. The decay curve follows(More)
1. In Chroococcus a quantum of light absorbed by phycocyanin has 90 per cent the chance of doing photosynthesis that a quantum absorbed by chlorophyll has. 2. By a process analogous to internal conversion in radioactivity (but with the linear dimensions and the wave length 10(4) times larger) there will be transferred from phycocyanin to chlorophyll See PDF(More)
One of the biggest challenges in building effective anti-spam solutions is designing systems to defend against the ever-evolving bag of tricks spammers use to defeat them. Because of this, spam filters that work well today may not work well tomorrow. The adversarial nature of the spam problem makes large, up-to-date, and diverse e-mail corpora critical for(More)