Yellow Plates Research Articles

The brightest stars in nearby galaxies. VIII - Cepheids and bright stars in NGC 3109

view Abstract Citations (48) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Brightest Stars in Nearby Galaxies. VIII. Cepheids and Bright Stars in NGC 3109 Sandage, Allan ; Carlson, George Abstract Cepheid variables have been found in the nearby Sm IV galaxy NGC 3109. Periods for 29 of the variables, determined from blue plates taken over a 4 yr interval with the duPont 2.5 m reflector at Las Campanas, range from 31 to 5 days. The period-luminosity relation is well defined, showing the intrinsic scatter in magnitude at a given period due to the width of the instability strip. As expected, the P-L relation has a shallower slope than that of the standard calibration, caused by observational selection bias near the plate limit. The apparent blue distance modulus is (m-M)_AB_=26.4, based on the P-L zero point adopted in the text. The brightest supergiants, found by blinking blue and yellow plates, have absolute magnitudes of M_B_(3)= -7.6 for the mean of the three brightest blue stars, and M_V_(3)= -7.7 for the corresponding mean of the three brightest red stars. The first ten brightest red supergiant candidates are variable, ensuring membership. These absolute magnitudes agree with the previous calibration of the brightest red and blue star luminosities as a function of the absolute magnitude of the parent galaxy. Publication: The Astronomical Journal Pub Date: November 1988 DOI: 10.1086/114911 Bibcode: 1988AJ.....96.1599S Keywords: Blue Stars; Cepheid Variables; Red Giant Stars; Stellar Luminosity; Supergiant Stars; Color-Magnitude Diagram; Light Curve; Local Group (Astronomy); Magellanic Clouds; Stellar Magnitude; Stellar Spectrophotometry; Astronomy; GALAXIES: INDIVIDUAL; GALAXIES: STELLAR CONTENT; GALAXIES: DISTANCES; STARS: CEPHEIDS full text sources ADS | data products NED (25) SIMBAD (6) Related Materials (8) Part 1: 1976AJ.....81..743S Part 2: 1983AJ.....88.1569S Part 3: 1984AJ.....89..621S Part 4: 1984AJ.....89..630S Part 5: 1985AJ.....90.1019S Part 6: 1985AJ.....90.1464S Part 7: 1986AJ.....91..496S Part 9: 1996AJ....111.1872S

Indeterminate Fecundity and Spawning Behavior of Captive Red Shiners–Fractional, Crevice Spawners

Abstract Nine pairs of red shiners Notropis lutrensis spawned 5 to 19 clutches each (4,701 to 8,248 eggs; mean = 6,177) between 13 June and 28 August 1983 in plastic wading pools. Clutches contained from 131 to 1,661 eggs (mean = 585). Mean clutch size for individuals ranged from 410 to 1,060 eggs. Over a 9-d period, 17 of 20 clutches were spawned between 0700 and 1200 hours. In horizontal crevices from 2 to 6 mm high, 62.3 and 22.5% of nearly 25,000 eggs were placed in the 2- and 3-mm crevices, respectively. Spawning females preferred crevices formed by red, orange, and green plates (71.4% of over 17,000 eggs) to those formed by black, blue, yellow, and white plates. Two females expelled eggs in groups averaging 48 and 71 eggs. A fish in 24-h light spawned 200 clutches (113,501 total eggs) in a 21-month test; daily spawning sometimes occurred at high temperatures (up to 34°C). Hatching began in 4 d at 26–28°C; oversized eggs yielded oversized larvae.

RESEARCH ON TRINUCLEAR MOLYBDENUM CLUSTER COMPOUNDS——CRYSTAL AND MOLECULAR STRUCTURE OF Mo 3 (μ 3 —O)(μ 2 —S 2 ) 3 [S 2 P(OEt) 2 ] 3 I

The title crystals are golden yellow rhomboic plates, belonging to the monoelinic system. The space group is P_(B_1)/n with unit cell parameters a=16.570(2), b=12.370(1), c=20.007(2), β=99.97(1)°, Z=4, D_c=1.938 g.cm~(-3). The crystal structure was solved mainly by the heavy atom method and refined by the full-matrix least-squares to a final R factor of 0.047 based on 4387 unique reflections with intensities I≥2σ(I). The results show that the crystal structure consists of neutral mono-oxo-capped trinuclear molybdenum cluster molecules with an average Mo-Mo bond length of 2.626(4) and an average Mo-O bond length of 2.036(2) respectively. Each pair of Mo atoms is further bridged by an S_2~(2-) radical, in which one S atom is essentially situated on the triangular plane formed by these three Mo atoms and the other one is situated on the side of the plane opposite to the μ_3-O atom. Besides, each Mo atom is coordinated to two S atoms belonging to an [S_2P(OEt)_2]~-radical so as to complete a nearly pentagonal bipyramidal coordination. In addition, on top of the three out-of-plane S atoms one I atom bridges these three S atoms so that a part of the atoms in the cluster entity forms a distorted pseudo-cubic configuration.

Greenhouse whitefly control through the combined use of the colour attraction system with the parasite waspEncarsia formosa [Hym.: Aphelinidae

The combined use of colour attraction (yellow sticky plates) andEncarsia formosa (Gahan) parasites reduced the greenhouse whiteflyTrialeurodes vaporariorum (Westwood) population in a spring tomato crop to an extremely low level. Whiteflies were strongly attracted to yellow sticky plates while the parasite,E. formosa, was not attracted so long as suitable and sufficient hosts were present. As the numbers of whiteflies declined, parasites were increasingly trapped by the plates. The percent parasitization increased continuously during the experiment, reaching about 90%, indicating the complete compatibility of colour attraction and biological control.

Reactions of metallabromoalkanes [M{(CH2)nBr}(CO)3(η-C5H5)](M = Mo or W, n= 3 or 4) with transition metal anions. Dimetalla-alkane and cyclic carbene complex formation. Crystal and molecular structures of [(η-C5H5)(OC)3Mo{(CH2)4}Mo(CO)3(η-C5H5)] and [(η-C5H5)(OC)3MoW(CO)2{C–O–(CH2)2CH2}(η-C5H5)

Reaction of Br[CH2]3Br with excess [Mo(CO)3(η-C5H5)]– leads to the spectroscopically characterised [(η-C5H5)(OC)3MoMo(CO)2{[graphic omitted]H2}(η-C5H5)] containing a cyclic carbene ligand. This species is formed via the intermediate [Mo{(CH2)3Br}(CO)3(η-C5H5)]. The related complex [(η-C5H5)(OC)3MoW(CO)2{[graphic omitted]H2}(η-C5H5)] is formed during reaction of [Mo{(CH2)3Br}(CO)3(η-C5H5)] with [W(CO)3(η-C5H5)]– and has been characterised by X-ray crystallography. This molecule crystallises as maroon needles, monoclinic, a= 8.017(6), b= 15.026(16), c= 7.981 (3)A, β= 92.88(5)°; R converged to 0.0645 for 1 256 independent reflections for which I/σ(I) > 3.0. The molecule contains a Mo–W single bond of 3.239(4)A, the cyclic carbene ligand is bonded to tungsten rather than molybdenum and is situated trans to the Mo–W bond regarding the co-ordination polyhedra of both metals as square-based pyramidal. Reaction of [M(CO)3(η-C5H5)]– with I[CH2]nI leads to [(η-C5H5)(OC)3M{(CH2)n}M(CO)3(η-C5H5)](M = Mo, n= 4; M = W, n= 3 or 4). The structure of one member of this class [(η-C5H5)(OC)3Mo{(CH2)4}Mo(CO)3(η-C5H5)] has been determined by X-ray crystallography. The molecule crystallises as yellow elongated plates, triclinic, a= 6.978 2(16), b= 7.005 1(10), c= 11.315 0(25)A, α= 102.378(15), β= 95.806(18), γ= 105.909(15)°; R converged to 0.0263 for 1 646 independent reflections. The molecule contains a crystallographically imposed centre of symmetry at the centre of the tetramethylene chain and the molecular structure may be compared to that of the known [(η-C5H5)(OC)2Fe{(CH2)4}Fe(CO)2-(ηC5H5)].

The astrometric position of T Tauri and the nature of its companion

view Abstract Citations (31) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The astrometric position of T Tauri and the nature of its companion. Hanson, R. B. ; Jones, B. F. ; Lin, D. N. C. Abstract The optical position of T Tauri is recalculated from previous data to demonstrate that the object is actually the same as that viewed to the north of it by other investigators. Radio data at 4.885 GHz and speckle interferometric data at 2.2, 3.8, and 4.8 microns were available. The optical data were determined to be subject to systematic zero-point errors, accidental errors in the mean epoch of observation, a proper motion error, and errors due to the visible nebulosity around T Tauri. New measurements were made on the initial proper motion yellow plate from Lick Observatory and another taken with an objective grating and offset exposures. It was found that the northern component coincided with the optical component, while the strong, southern component was the same as a previous radio position. Furthermore, it was shown that the two components shared the same proper motion to within 1.1 arcsec/yr. It is suggested that an accretion disk around the object may cause some of the discrepancies. Publication: The Astrophysical Journal Pub Date: July 1983 DOI: 10.1086/184063 Bibcode: 1983ApJ...270L..27H Keywords: Astrometry; Companion Stars; Main Sequence Stars; T Tauri Stars; Infrared Stars; Position (Location); Radio Sources (Astronomy); Stellar Mass Accretion; Astronomy full text sources ADS | data products SIMBAD (1)

Substrate-mediated increased reactivity of a critical sulfhydryl group of crystals of cytoplasmic aspartate transaminase

The extramitochondrial isozyme of aspartate aminotransferase ( l-aspartate:2-oxoglutarate aminotransferase EC 2.6.1.1) contains a cysteinyl residue (cysteine-390) which, in the presence of substrate, displays enhanced reactivity toward sulfhydryl reagents. To gain insight into the structural similarity of the enzyme in solution compared to its crystalline state and into the type of structural change induced by substrates, the reactivity of Cys-390 in the crystalline enzyme has been studied. The flat yellow plates, crystallized from polyethylene glycol, form spectroscopically detectable enzyme-substrate complexes (C. M. Metzler, D. E. Metzler, D. S. Martin, R. Newman, A. Arnone, and P. Rodgers, 1978, J. Biol. Chem. 253, 5251–5254). The crystals, both in the presence and absence of the substrate pair, glutamate and α-ketoglutarate, were treated with N-ethylmaleimide or N-ethyl[1- 14C]maleimide and the extent of the reaction was monitored by the colorimetric sulfhydryl reaction with 5,5′-dithiobis-2-nitrobenzoic acid, by amino acid analysis, by radioactivity incorporated, and by the measurement of enzyme activity. A cysteine residue was modified only in the presence of substrate; the crystals remained undamaged. Since, any large conformational change in the enzyme would either be prevented by the crystalline lattice or would disrupt its integrity, it is concluded that the enhanced reactivity of cysteine-390 in the presence of substrates must be due to only a small local conformational change in the substrate binding region.

PbTiO3grown from the melt

Abstract Transparent PbTiO3 single crystals were successfully grown from the melt. Brownish yellow crystal plates with a diameter of up to 20 mm and 2–3 mm in thickness were obtained. On (100)- and (001)-surface etch pits of about 105 cm−2 revealed the distribution of dislocations and 180° and 90° domains. Measurements of the dielectric constant, the dielectric loss factor as a function of frequency, and the dc resistivity were reported. A modification of the crystal puller suppressing PbO evaporation is shown.

La schmitterite UTeO5 de Shinkolobwe (Région du Shaba, Zaïre)

A second occurrence of schmitterite UTeO₅ from the Shinkolobwe uranium deposit is described. The mineral has the same habit (yellow tabular plates making up small rosettes) and the same properties as the type-mineral from Moctezuma (Mexico). Microprobe analysis gives UO₂ > 60 %, TeO₃ > 30 %, V₂O₅ ≈ 1 %, Ce₂O₃ trace.

Chemical Studies in the Genus Lobaria and the Occurrence of a New Tridepside, 4-O-Methylgyrophoric Acid

Chemical Studies in the Genus Lobaria and the Occurrence of a New Tridepside, 4-O-Methylgyrophoric Acid

Crystal and molecular structures of two crystallographic modifications of trans-di-iodobis(dimethylphenylphosphine)palladium(II)

X-Ray diffraction studies of the crystal structures of two forms of trans-di-iodobis(dimethylphenylphosphine) palladium(II) are summarised. Form I, crystallising as red needles, is orthorhombic with a= 8·79, b= 13·06, c= 17·82 A; space group P212121. Palladium atoms are bridged by iodine atoms and two quite short intramolecular palladium–hydrogen interactions follow from the positioning of the phenyl rings on the phosphine ligands. Form II, crystallising as yellow plates, is monoclinic with a= 10·20, b= 10·71, c= 10·23 A, β= 111·7°; space group P21/c. With two molecules in the unit cell, the complex is required to have precise Ci symmetry and octahedral co-ordination of the palladium is now achieved through intermolecular interactions with hydrogen atoms on the β-carbon atoms of the phenyl rings of the phosphine ligands.

Studies on Antimony(V) Oxinate

AbstractIn strong HCl solutions SbCl5 reacts with 8‐hydroxyquinoline (oxine) to form only a 1:1 compound recoverable (in > 95% purity) as crystalline golden yellow plates of SbCl5 · C9H7ON (m. p. 145 °C dec.). It hydrolyses in moist air and absorbs HCl strongly. Solubility in aq · HCl, acetone, chloroform and carbon tetrachloride indicate absence of a chelated structure. Reaction with AgNO3 and ion‐exchange behaviour suggests existence of an anionic antimony(V) species incorporating the chlorine atoms, in acetone solutions of the compound. Absorption spectra in CCl4, CHCl3 and acetone solutions have been recorded and a tentative structure for the compound is proposed.

THE NEW 20-INCH ROSS-PERKIN-ELMER LENS OF LICK OBSERVATORY

The 20-inch Carnegie astrograph was conceived and built as a double astrograph, but only the blue-corrected lens was initially provided. The first-epoch plates of the Lick propermotion program1 were taken with this lens between 1947 and 1954. When the second-epoch blue exposures are made, simultaneous photographs in yellow light will also be taken. Since the automatic measuring engine under construction2 will incorporate an iris photometer, the measurement of blue and yellow plates will yield colors of stars in addition to proper motions and magnitudes, thus increasing the value of the

The Preparation of Strictly Halide Complexes of Copper(II) and Their EPR Spectra

Abstract Some copper complexes which have only chloride ions in the coordination spheres have been prepared and their EPR spectra examined at the microwave frequency of the X-band. Most of these compounds gave single EPR lines with half-widths ranging from 110 to 220 oe; this seems to indicate the existence of superexchange interaction. Only the yellow plates of dimelammonium hexachlorocuprate-(II) showed the fine structure of an anisotropic g-tensor, from which fact the g-components were evaluated as g||=2.32 and g⊥=2.08 for this compound. The dark green color of diethylenetriammonium chlorocuprate(I, II) is probably due to the interaction of Cu+ and Cu2+ in the crystal lattices. Brown chlorocuprates with a chlorine to copper ratio of 3 : 1 are probably coordination polymers ; the EPR lines of these compounds are so broad as to cover thousands of oersteds.

イロハモミジ<i>Acer palmatum</i> THUNBERG葉の化学的成分について

The yellow plates crystals, m.p. 260-261°(decomp.), isolated from leaves of Acer palmatum THUNBERG has been cofirmed to be vitexin.

Studies on the Synthesis of Acenaphthene Derivatives. VII

In order to investigate the rate of formation of two kinds of isomer of 4-benzoyl-1, 8-naphthoylenebenzimidazole, obtained from condensation of 4-benzoylnaphthalic anhydride and o-phenylenediamine, synthesis of each of them has been made. 4-Nitro-7 H-benzimidazo [2, 1a] benz (de) isoquinoline-7-on was made through 5-nitro-8-bromo-l-naphthoic acid as a starting material, this was treated for nitrile formation by the reduction, its carboxylation and benzoylation gave 4-benzoyl compound in clear yellow plates with mp. 198-9°c. 3-Benzoyl compound was prepared from condensation of 4-nitronaphthalic anhy dride and o-phenylenediamine in almost a pure form of 3-nitro compound, and this was derived into 3-benzoyl compound in the procedure as above. 3-Benzoyl compound was clear yellow needles with mp 235-6°c.

N-Glycosideの過沃度酸々化について (第11報)

The oxidation reaction reported in Parts IX and X of this series is a reaction in weak acidity of pH 4.2-4.5. In the present series of experiments, the effect of pH on the oxidation of aniline with periodic acid was examined in detail.1) Reaction in strong acidity (pH 1.0): In the initial stage of the reaction, precipitate of emeraldine is formed but if the mixture is allowed to stand until consumption of IO4- becomes constant, then a black powder is obtained. This powder, as well as the substance obtained by its treatment with ammonia, forms a precipitate insoluble in 80% acetic acid and other common solvents. In this case, IO3- formed from IO4- also takes part in this reaction.2) Reaction in strong alkalinity (pH 12.0): Reaction does not occur at all.3) Reaction in weak alkalinity (pH 9.0-9.4): The reaction is very slow and it requires about 120 hours until consumption of IO4- becomes constant. The chief component of the oxidation products is dianilino-p-benzoquinone. In addition, bibliographically unknown two substances, reddish brown needles of m.p. 151° (decomp.) and yellow plates of m.p. 174°, were obtained as the oxidation products of aniline.

ふじばしで樹皮成分に関する研究 (第5報)

Paper chromatography of the glycoside A from Engelhardtia formosana with 20% methanol as the developing solvent gives two spots (cf. Table I). Isolation of the two substances was attempted by the chromatopile method by which they were separated into engelitin (I) and kaempferol 3-L-rhamnoside (II) as yellow plates, m.p. 172-174°, C21H20O10⋅2H2O, which agreed with the properties of afzelin except for the water of crystallization. Recrystallization of a mixture of (I) and (II) afforded a substance completely identical with the glycoside A, which was thereby confirmed as a mixed crystal.

α-Lipoic Acid及び其の類縁化合物の研究 (第1報)

On the reduction of ethyl 8-acetylthio-6-oxoöctanoate with sodium borohydride, two products are obtained by the amount of the reducing agent used. When 0.6 mole of sodium borohydride is used for 1 mole of the octanoate, 8-acetylthio-6-hydroxyoctanoate is obtained as reported in literature. When the molar ratio is 1:1, a substance of b.p0·4 127-129° is obtained which was found to be ethyl 8-mercapto-6-hydroxyoctanoate and was proved by its consecutive derivation to ethyl 8-benzylthio-6-hydroxyoctanoate (b.p0·5 189-190°), 6-bromo compound (b.p0·4 195-200°), and to 6, 8-dibenzylthiooctanoic acid (m.p. 67, 5-69°). The last-named compound afforded DL-lipoic acid as yellow plate crystals.

芳香環状異項環の分極 (第104報)

3, 5-Dinitro-4-cyanopyridine was prepared from 3, 5-dinitro-4-chloropyridine by heating it with cuprous cyanide, directly or in nitrobenzene, as platelet crystals of m.p. 140°, with a maximum yield of 45%. Treatment of 4-hydroxy-3, 5-dinitro-α-picoline 1-oxide with phosphorus trichloride in ethyl acetate gave 3, 5-dinitro-4-hydroxy-α-picoline in 87% yield, as pale yellow plates, m.p. 269° (decomp.). Further heating of the latter with phosphoryl chloride gave 3, 5-dinitro-4-chloro-α-picoline in 73% yield as colorless prisms, m.p. 108°. The latter was easily sublimable and its heating with cuprous cyanide failed to yield 4-cyano derivative, resulting in the recovery of 70-90% of the starting material.