Iriss

Dyeing) rainbow ground, irisieren, v.t. irisate, iridize. — v.i. iridesce. — irisierend, p.a. iridescent. 

Because of their very complex chemical structures and heterogeneity, melanins are difficult to extract, separate, and characterize from tissues. Eumelanins are insoluble in water and organic solvents. They can be extracted from tissues with strong chemicals that are capable of removing lipids, proteins, and other tissue components but also lead to the formation of degradation products. Enzymatic procedures were developed for the isolation of eumelanins from mammalian hair and irises. The first step is sequential digestion with protease, proteinase K, and papaine in the presence... 

Arrowhead Sagittaria sagittifoUa) Brooklime Veronica beccabunga) Dwarf papyrus Cyperus prolifer) Flowering rush Butomus umbellatus) Irises Iris)... 

Susceptible plants Irises, especially bearded types. 

Both standing wave and traveling wave patterns can be used in linear accelerators. If traveling waves are used, the phase velocity of the waves must be made equal to the velocity of the particles accelerated as the particle velocity increases, the phase velocity must also increase. But, phase velocities in simple waveguides always are greater than the velocity of light, and loading must be introduced to reduce the phase velocity to the desired value, This can be accomplished by the introduction at intervals of washer-shaped irises,... 

An example of PCA compression is made using the classic Fisher s Irises data set.29 Table 8.2 lists part of a data set containing four descriptors (X-variables) for each of 150 different iris samples. Note that these iris samples fall into three known classes Setosa, Verginica, and Versicolor. From Table 8.2, it is rather difficult to determine whether the four X-variables can be useful for discriminating between the three known classes. 

Figure 8.8 provides a scatter plot of the first two PC loadings, which can be used to roughly interpret the two new compressed variables in terms of the original four variables. In this case, it appears that the first PC is a descriptor between the sepal width and the other three X-variables, while the second PC is a descriptor of the two sepal measurements only. The plot also shows that the petal width and petal length are highly correlated with one another for the 150 irises used in this study. Further discussion on the interpretation of PC scores and loadings is found in Section 8.6.1. 

Figure 7. a) Decidability d vs. number of sorted frequency-scale pairs included in the feature vector, b) the separation margin s, c) the length of the iris feature vector, d) distribution of comparison scores for the same and different irises for the best final 144 byte iris feature vector. 

Bob walks over to the refrigerator. Inside is a bowl full of strawberries, one of the new genetically engineered varieties that turn translucent when cold. Each one also contains 50 milligrams of caffeine and other methylxanthines. Bob tosses a few to Miss Muxdroozol and Mr. Plex, who gobble them down with great gusto. Bob watches as Mr. Plex s irises contract and dilate at one-second intervals. 

The H1680 emulsion deposit shows no irisation, so the layer thickness is greater than the visible light wavelengths, in contrast to the market reference. 

Irises offer a huge range of colors and patterns, heights, and bloom times, with variations on a common flower shape and plant form. The basic iris flower consists of 3 inner (often erect) petals, called standards, surrounded by 3 outer petals (usually arching out), called the falls. Long, flat leaves resem-... 

In placd of a beard, beardless irises f.aunt a colorful spot, called a signal, or an r.tricate pattern of lines. Blooms on Siberian Tis i/m sibirica) rarely exceed 3" wide they >ccur in shades of white, red-violet, blue, and purple (occasionally pinks and yellows) in upright, grassy clumps averaging 3 tall. They... 

Most bearded irises are easy to grow, but they do have specialized needs. Plant and divide (every 3-4 years) in summer or early fall, splitting them into individual fans with the rhizome attached, or into divisions with a few... 

Bearded irises tolerate drought very well when dormant (usually beginning about 6 weeks after bloom), but water them well until dormancy sets in and after division. Fertilize routinely in spring and early fall, keep weeds and other plants away from rhizomes, mulch loosely the first winter after division, and plan to stake tall-growing cultivars when in bloom. 

Siberian irises enjoy conditions similar to those favored by bearded irises, but tolerate wetter soil and need less-frequent division in spring or fall. Replant as soon as possible 2ifter dividing. 

Grow Japanese irises in much the same way, providing shade from the hottest sun. Water well before and during bloom. They need acid soil and benefit from a few inches of mulch in summer. 

Plant reticulated irises in fall, about 3" deep and a few inches apart in average to more fertile, very well drained soil. Grow with annuals and perennials to fill gaps left by their leaves, which wither by summer. 

Leaves with irregular tunnels rhizomes damaged or rotted. Cause Iris borers. The most destructive pest of irises, these moth larvae favor bearded irises, but may feed on all species. They seldom bother Siberian irises. Borer eggs hatch in spring, producing up to 2 long, fat, pinkish larvae. The larvae enter a fan at the top and tunnel down toward the rhizome, where they may eat the whole interior without being noticed. Borers often introduce soft rot bacteria into rhizomes as they feed. 

Flower buds die petals distorted growth stunted. Cause Thrips. Several species of tiny thrips infest irises Japanese irises are especially susceptible. Thrips feed on inner folds of leaves, causing stunted growth and russet or sooty areas on leaves. Tops of plants eventually turn brown and die. Flowers may appear discolored, flecked with white, or deformed. These pests are difficult to control, for they burrow into plant tissue. Don t buy sickly looking irises that may be infested. Remove and destroy severely infested plant parts. Use blue sticky traps to monitor and trap pests. Applications of insecticidal soap may provide some control once pests are spotted in traps. 

Leaves with yellow, hr tlii, or hlack spots. Cause Leaf spots. Irises may develop leaf spot, caused by several different species of fungi, especially in wet weather. Remove infected plant parts clean up debris in fall to remove disease spores. 

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