Botanical Illustration by Valerie Oxley

By Valerie Oxley

Development at the paintings of illustrators of the earlier, starting from Elizabeth Blackwell, whose drawings helped to unencumber her husband from debtors' felony, via to the phenomenal clinical drawings of Beatrix Potter, this booklet offers with either the sensible artwork and the comparable botany of the topic. beginning with an creation to uncomplicated botany; this consultant subsequent covers training of plant fabric for drawing and using pencils, watercolors, coloured pencils, and pen and ink; and finishes with correcting error and completing touches and recommended themes for extra learn.

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Naturforsch. ] 40 J. G. Diegel and Μ. M. Pintar, J. Natl. Cancer Inst. 55, 725 (1975). 2. WATER IN BIOLOGICAL 24 2 1 4 1 - 44 SYSTEMS 1 lation t i m e s . * on frog muscle, is a good example of what can be achieved. Fast exchange between the various sites ensures, of course, that the recovery remains exponential. The logarithmic distributions, which are generally used, unfortunately afford little physical insight into the system and are often incapable of simul44 taneously fitting the T 2 dispersion d a t a .

289 G. L. Cottam, A. Vasek, and D. Lusted, Res. Commun. Chem. Pathol. Pharmacol. 4, 495 (1972). R. Damadian, Κ. Zaner, D. Hör, and R. DiMaio, Proc. Natl. Acad. Sei. A. 71, 1471 (1974). Ν. Bloembergen, Ε. M. Purcell, and R. V. Pound, Phys. Rev. 73, 679 (1948). R. Kubo and K. Tomita, J. Phys. Soc. Jpn. 9, 888 (1954). 22 2. 046 (9) Probability values are reported for series with sample size > 3. Errors reported are standard error of the mean (SEM). Number of cases analyzed are indicated in parenthesis.

The percentage of extracellular water is, in this case, extremely small due to the use of a single cell. However, the relaxation times are typical. The process leading to relaxation is believed to be dipolar coupling modulated by exchange and the important correlation time is therefore τ 6 . 24 Knispel et al. originally suggested that this referred to the time for proton exchange but later preferred to associate it with the lifetime of a molecule in 58 the bound p h a s e . The predominant dipolar interaction is the intra5 molecular o n e , but interactions with the macromolecular protons may also 5 0 , 59 be i m p o r t a n t .

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