Prisms and

Periodic cells used in computer simulations the cube, truncated octahedron, hexagonal prism and rhombic hedron. 

A wavelength selector that uses a diffraction grating or prism, and that allows for a continuous variation of the nominal wavelength. 

The deterrnination of the stmcture of Fe (00) 2 proved to be a difficult problem. An early report on the crystal stmcture claimed the molecule was a monoclinic prism and estabHshed the molecular formula (22). In a later report stmcture (8) was shown to be a triangular array of iron atoms with two bridging and 10 terminal CO molecules. This accepted stmcture was initially deduced from an x-ray crystal stmcture of the Fe2(CO)22H analogue (23). 

Bilirubin [635-65-4] M 584.7, e450nm t OO in CHCI3, pKE t 3 0. An acyclic tetrapyrrole bile pigment with impurities which can be eliminated by successive Soxhiet extraction with diethyl ether and MeOH. It crystallises from CHCI3 as deep red-brown rhombs, plates or prisms, and is dried to constant weight at 80 under vacuum, [Gray et al. J Chem Soc 2264, 2276 1961.]... 

Tropic acid crystallises in prisms and melts at 117°. It contains an asymmetric carbon atom and can be resolved into d- and Z-forms, which, according to King, melt at 128-9°, and have [ajj, + 81-6° and — 81-2° (HjO) respectively. 

Phenylglycollyltropeine Mandelyltropeine, homatropine), CigHjiOjN. This is largely used as a substitute for atropine. It crystallises in prisms, m.p. 95-5-98-5°. The hydrobromide, the salt usually employed in medicine, is a crystalline powder, m.p. 217-8° (dec.) the hydrochloride, m.p. 224-5°, and the salicylate are also used. All tl ee are freely soluble in water. The methobromide has m.p. 192-6°. The aurichloride, B. HAUCI4, forms prisms and is sparingly soluble in water. Homatropine, unlike atropine, does not give the Vitali colour reaction (p. 70). Its mydriatic effect is more rapid and transient than that of atropine. 

It is sparingly soluble in ether or chloroform, readily in alcohol or solutions of caustic alkalis, but not in ammonia, and gives the thalleioquin reaction. Cupreine is a diacidic base the neutral sulphate, Bj. H2SO4, forms colourless anhydrous needles, m.p. 257 , soluble in 813 parts of water at 17 the iwiid sulphate, B. HjSO. HjO, crystallises in prisms and is soluble in... 

The acid yields a methyl ester (hydrochloride, slender needles methiodide, pale yellow prisms) and a dimethyl ester, crystallising in colourless prisms and yielding a methiodide, CjjHjgOjNj. CH3I, which forms hexagonal plates. The silver salt is converted by methyl iodide in methyl aleohol into the betaine, C2oH2iOgNj, eolourless prisms, — 5-6° (HjO). 

Figure 5 shows a ray path in TEM equipped with a Castaing-Henry imaging filter lens (Zeiss CEM-902). The imaging filter lens consists of a double magnetic prism and an electrostatic mirror. There is a limitation to accelerating... 

B-type, also eonsisting of LnOy units but now of three types, two are eapped trigonal prisms and one is a eapped oetahedron favoured by the middle lanthanides. 

Arcs of Circles 4. Concurrency 5. Similarity 5. Prisms and Pyramids 5. Coordinate Systems 6. 

Prisms and pyramids are described by their bases a triangular prism has a triangular base, a parallelpiped is a prism whose base is a parallelogram and a... 

In the laboratory, RI is measured using a refractometer. The instrument has two prisms and a light source. The technician spreads a small amount of sample on the faces of both prisms in the refractometer. The light is then directed at the sample and the scale is read. The observed scale is then converted to a refractive index with tables supplied with the instrument and corrected for the sample temperaturi. ... 

A solution of 1-phenyl-1//-pyrazolo[3,4-rf]pyridazinc-7-carbonitrilc (150 mg. 0.68 mmol) and A,A-diethyl-prop-l-ynamine(151 mg, 1.36 mmol) in l,4-dioxane(2 mL) was refluxed for 5 h. After cooling, the reaction mixture was poured onto excess ice, and extracted with CHC13. The extract was washed with H20, dried (Na2S04) and concentrated under reduced pressure. Purification by chromatography (silica gel, benzene then bcnzene/EtOAc 20 1) gave, from the benzene eluate, 6-diethylamino-1 -phenyl-1 //-indazole-7-carbo-nitrile [yield 81 mg (39 %) mp 104-105 C (benzene/petroleum ether)] as slightly yellow prisms and, from the second eluate, the diazocine 5 as yellow needles yield 90 mg (40 %) mp 121-122 C (benzene/ petroleum ether). 

Crystal Structure and Lattice Parameters (nm) Orthorhombic, a = 0.283, b = 0.554, c = 1.1470 Cr3C2 is an intermediate carbide having carbon chains with C-C distance approximately 0.165 nm running through distorted metal lattice where the Cr atoms are at the corners of trigonal prisms and the carbon atoms in the center of the prisms.i li" ... 

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