Needle stone

Nadel-punktienmg, /, acupuncture, -spltze, /, pin point, needle point, -stein, m, needle-stone (natrolite), -stlch, m, needle prick needle hole, -ventil, n, needle valve, -zeolith,... 

Rutile (titanium oxide) Rutilated quartz Needle stone Venus hair stone Sagenite Colorless to smoky quartz, often as crystals, with needle-shaped yellow, red, or brown crystals of rutile randomly scattered or in radiating sprays... 

The Allende, Murchison, Murray and Orgueil meteorites are particularly highly prized for research into stellar grains, since several kilograms of this material have been identified in each of them. This is sufficient to be able to take samples of the order of 1 g without damaging the source. Such samples can then be subjected to compositional analysis. But how can we extract these stellar jewels, measuring at most 1 /rm in diameter, from the matrix in which they are embedded The best way of finding a needle in a haystack is to bum the hay. Cosmochemists employ basically the same method when they use chemical processes to isolate star dust trapped in meteoritic stone. They may then analyse... 

The effects of acid rain can be seen in lakes and streams, in forests, and on all kinds of structures. The lowered pH kills fish eggs, fish, and many other organisms that live in lakes and streams. In forests, the acid can kill the leaves and needles of trees. It damages the soil by depleting it of nutrients, which stunts plant growth. Acid rain also eats away at the surfaces of buildings and other structures. Structures made of marble and other calcium-containing stone are particularly sensitive to acid rain. 

Whenever that stone approaches iron it draws it to itself so that it is seen that iron has in it a spirit, for magnes causes it to move as if it had a living spirit in it. And it comes to this stone and attaches itself to it. And such is the obedience of iron to this stone that if many needles should be fixed in the earth and this stone should approach them, all the needles would attach themselves to the stone, or if one were attached to the stone the others would attach themselves to this one so that one would hang from another. 

Spare parts that are needed are compression fittings and ferrules, plunger and injector rotor seals, an extra plunger and seals, column filters, and injector needle port seals. If you do not use pacification, you might want to keep a set of check valves on hand. I always have one coil each of 0.01- and 0.02-in tubing in addition to my column blank. A replacement solvent inlet line with a porous stone is useful in case of corrosion. If you filter solvents, you need cellulose, nylon, and Teflon filters. You also need a back-up lamp for your detector. 

Needle iron stone See Goethite. . An acicular variety. 

The earliest bone carvings that have been found are reckoned to be about 40 000 years old. They are inevitably primitive, and it is not known what they were used for. In the Stone Age humans discovered how to carve bone to make sewing needles, but before that they made musical wind instruments from the bones of large birds, such as vultures. Some of the flutes found are thought to be up to 24 000 years old. The fashion for bone flutes continued until Roman times and later. The bone most favoured for the instruments was then the shin bones of sheep. 

Touch needle A small bar of gold, either pure, or alloyed with silver in a known proportion, for trying the fineness of a gold or sliver article by comparing the streaks made by the article and the bar on a touchstone. Touch paper 2059 Paper impregnated with potassium nitrate. It bums steadily without flame and is used for Igrrltlng fireworks. Saltpeter paper. Touchstone 3190 A stone or piece of black pottery used for assaying. 

The acid salt, (C,H,N,0,),Ca, is obtained by decomposing a boiling solution of arid potassium urate with calcium chloride solution. It crystallizes in needles, soluble in 603 parts of cold H,0 and in 276 po of boiling H,0. It occurs occasionally in urinary sediments and calculi, and in chalk-stones. ... 

Orange needles from toluene, nip 223-224" Sublimes in COj stream. Absorption spectrum Stone, Furman, J. j4m. Cbem. Soc, 68, 2742 (1946). Freely sol in hot alcohol, in ether in benzene with yellow color in ammonia water and in sulfuric acid with crimson color. 

Mellitic Acid, C6(COOH)6, is of interest as it contains six carboxyl groups. It occurs in peat as the aluminium salt, which is called honey-stone, C6(C00)6Al2.18H20. The acid is formed as the result of the oxidation of lignite, wood-charcoal, or graphite with potassium permanganate. It crystallizes in silky needles, and is not affected when treated with nitric acid, sulphuric acid, or bromine. Benzene is formed when the calcium salt of mellitic acid is heated with lime. 

The Egyptian and Tigris-Euphrates Valley societies both symbolized the Philosophers Stone as an elongated pyramidal or conical shaped stone, about twice as tall as it is wide. It was similar to the Ben Stone and the point of Thutmose Ill s column, now the misnamed Cleopatra s Needle in London. 

FIGURE 29.9 RCM robot with radiolucent PAKY needle driver used in percutaneous kidney stone removal. Photo courtesy Dan Stoianovici.)... 

SEM analysis revealed a large mottled area surrounding a soUd center, with laths and needles near the perimeter, as shown in Figure 9(c). EDX analysis revealed the solid center was composed primaiily of sihca and alumina(9(d)) the mottled area was composed of silica, alumina, and soda (9(e)) the elongated lath-Uke crystals which were composed primarily of alumina (9(f)) and the needles were composed primarily of alumina with lesser amounts of silica (9(g)). SEM DX analysis provided the same information as the petrographic techniques. In addition, it provided the elemental composition of the center, laths, needles, and perimeter of the stone. The stone was a clay refractory material with some conversion to corundum, muUite, and nepheline. 

Excision of precise pieces of the neural fold or neural plate in the chick host Very thin microscalpels (made up from insect pins or steel needles sharpened on an oil stone) are used to excise precise fragments of the folds and neural plate in 0- to 5-somite stage chick embryos in ovo. An ocular micrometer is used to measure the pieces of tissue to be removed. 

Gout is commonly associated with rich food and alcohol consumption. Rich food is a source of dietary DNA and RNA, which is broken down to urate. Alcohol causes the accumulation of lactate, which competes with urate for excretion by the kidney. Gout results when the concentration of urate (which is sparingly soluble) in the blood increases to a concentration when it is precipitated as crystals of uric acid. This causes considerable pain, as illustrated in the picture The Gout by James Gitray in 1799. The needle-shaped crystals of uric acid can be deposited around joints, especially in the big toe. Crystals can also be deposited in the urinary tract as renal stones or in the skin as tophi, e.g. in the ear lobe. Gout is treated with the xanthine oxidase inhibitor, allopurinol, which restricts the production of uric acid. 

Physical agents Metal objects, paper knives, scissors, tweezers, pincers, forks, various tools, fingernails, small sand-bags, haemostatic ligatures, pumice stone, incandescent needles, lighted cigarettes... 

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