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  • Life and Medical Sciences  (16)
  • Inorganic Chemistry  (9)
  • ASTRONOMY  (2)
  • 1995-1999  (27)
  • 1970-1974
  • 1955-1959
  • 1995  (27)
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  • 1995-1999  (27)
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  • 1
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    Recent chaqnges in the IUE spectrum of the very young planetary nebula He 3-1357 (=SAO 244567) (1995)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: We obtained the first high-dispersion IUE spectrum, and an additional low-dispersion spectrum of the very young planetary nebula He 3-1357 and its central star SDAO 244567. In 1988, it showed a very strong C IV lambda-1549 P Cygni profile which diminished and has disappeared by 1994, but C IV absorptions are seen in a high-resolution spectrum. The electron density from the C III F(lambda 1907)/F(lambda 1909) emission ratio is log N(sub e) = 4.1/cc. The older IUE data were reprocessed, and emission-line fluxes vary greatly for the period 1988-1994. The high-dispersion data show a rich Fe V and Fe VI absorption spectrum.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 443; 1; p. 245-248
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Detection of compact ultraviolet nuclear emission in liner galaxies (1995)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Low-ionization nuclear emission-line regions (LINERs), which exist in a large fraction of galaxies, may be the least luminous manifestation of quasar activity. As such, they may make possible the study of the active galactic nucleus (AGN) phenomenon in the nearest galaxies. The nature of LINERs has, however, remained controversial because an AGN-like nonstellar continuum source has not been directly observed in them. We report the detection of bright (greater than or approximately = 2 x 10(exp -16) ergs/s/sq cm/A), unresolved (full width at half maximum (FWHM) less than or approximately = 0.1 sec) point sources of UV (approximately 2300 A) emission in the nuclei of nine nearby galaxies. The galaxies were imaged using the Faint Object Camera (FOC) on the Hubble Space Telescope (HST), and seven of them are from a complete sample of 110 nearby galaxies that was observed with HST. Ground-based optical spectroscopy reveals that five of the nuclei are LINERs, three are starburst nuclei, and one is a Seyfert nucleus. The observed UV flux in each of the five LINERs implies an ionizing flux that is sufficient to account to the observed emission lines through photoionization. The detection of a strong UV continuum in the LINERs argues against shock excitation as the source of the observed emission lines, and supports the idea that photoionization excites the lines in at least some objects of this class. We have analyzed ground-based spectra for most of the northern-hemisphere galaxies in the HST sample and find that 26 of them are LINERs, among which only the above five LINERs have a detected nuclear UV source.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 440; 1; p. 91-99
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
    Digitale Medien
    Digitale Medien
    Photochemische Reaktionen von Übergangsmetall-Organyl-Komplexen mit Olefinen, 1312. Mitteilung: Lit.Photochemisch induzierte [5+2],homo[5+21-Cycloaddition von 3-Hexin an Tricarbonyl(η5-2,4-cycloheptadien-l-yl)mangan (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 515-518 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Manganese ; Cycloheptadienyl ; Alkyne ; [5+2],homo[5+2] Cycloadditions ; Tricyclo[5.3.1.04,10]undeca-2,5-dien-11-yl ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Photochemical Reactions of Transition Metal Organyl Complexes with Olefins, 1312. Mitteilung: Lit. . - Photochemically Induced [5+2], homo[5+2] Cycloaddition of 3-Hexyne to Tricarbonyl(η 5-2,4-cycloheptadien-1-yl)manganeseTricarbonyl(η5-2,4-cycloheptadien-1-yl)manganese (1) reacts upon UV irradiation in hexane at 243 K with two equivalents of 3-hexyne (2) in successive [5+2],homo[5+2] cycloadditions to give tricarbonyl(η2:2:1-1,2,3,11-tetraethyltricyclo-[5.3.1.04,10]undeca-2,5-dien-11-yl)manganese (3). Its crystal and molecular structure was determined by an X-ray diffraction analysis, in solution it was studied also by IR and NMR spectroscopy.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19951280513
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  • 4
    Digitale Medien
    Digitale Medien
    Darstellung und Komplexierung von 1,4-Dimethyl-2,3-bis(isopropyliden)-1,4-diboratetralinHerrn Professor Nils Wiberg zum 60. Geburtstag gewidmet. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 183-185 
    Details
    ISSN: 0009-2940
    Schlagwort(e): 1,4-Diboranaphthalines ; 2,7-Diboradodeca-1,3,9,11-tetraenes ; Cobalt complexes ; Rhodium complexes ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Synthesis and Complexation of 1,4-Dimethyl-2,3-bis(isopropylidene)-1,4-diboratetraline1,4-Dimethyl-2,3-bis(isopropylidene)-1,4-diboratetraline (2) is obtained from o-dilithiumbenzene and 2,5-dimethyl-3,4-bis(chloromethylboryl)-2,4-hexadiene in 61% yield. Its complexation with cyclopentadienylbis(ethene)cobalt leads to the triple-decker bis(η5-cyclopentadienylcobalt)-μ-η6,η6-1,4-dimethyl-2-isopropenyl-3-isopropyl-1,4-dihydro-1,4-dibora-naphthaline (3) in low yield. However, the reaction of 2 with (C5H5)Rh(C2H4)2 and (C5Me5)Co(C2H4)2 originates complexes of a tricyclic ligand formed from 2 via conrotatoric [2 + 2] cycloaddition of the isopropylidene groups. (η5-Cyclo-pentadienylrhodium)-η6-tricyclo-[6.4.0.03,6]-2,4,4,5,5,7-hexamethyl-2,7-diboradodeca-1,3,9,11-tetraene (4), (η5-pentamethylcyclopentadienylcobalt)-η6-tricyclo-[6.4.0.03,6]-2,4,4,5,5,7-hexamethyl-2,7-diboradodeca-1,3,9,11-tetraene (5) and its related dinuclear complex 6 could be isolated in 29, 10, and 31%, respectively. Their constitutions are derived from spectroscopic data and proven by X-ray structure analysis of 4.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19951280216
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  • 5
    Digitale Medien
    Digitale Medien
    Fe(NCMe)2+3-Komplexe von chiralen Tripodliganden mit drei verschiedenen Donorgruppen: Dynamik und StrukturHerrn Prof. Dr. Herrmann Schildknecht gewidmet. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 293-301 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Tripodal ligands, chiral ; Iron tris(acetonitrile) tripod complexes ; Chiral triphosphanes ; Conformational analysis ; Ligand exchange ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Fe(NCMe)2+3 Complexes of Chiral Tripod Ligands Bearing three Different Donor Groups: Dynamics and StructureChiral tripod ligands [tripod = CH3C(CH2PR2)(CH2PR′2)(CH2-PR′′2), 1a-d] with three different donor groups react with Fe(NCMe)6(BF4)2 to yield the complexes tripodFe(NCMe)3(BF4)2 (2a-d). These complexes show an idealized octahedral coordination based on a facial coordination of the tripod ligand. The asymmetry of the chiral tripod ligands a-d induces a differentiation of the remaining coordination sites at iron. The structure and the dynamic behaviour of the compounds 2a, b is elucidated by X-ray structural analyses and 2D-NMR techniques.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19951280314
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  • 6
    Digitale Medien
    Digitale Medien
    The Molecular Structures and Conformations of Bis(dichlorosilyl)amine and Bis(dichlorosilyl)methylamine in the Gas Phase: Determination by Electron Diffraction and by ab Initio Calculations (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 807-815 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Amines, bis(dichlorosilyl) ; bis(dichlorosilyl)methyl- ; Gas-phase electron diffraction ; Calculations, ab initio ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The gas-phase molecular structures of bis(dichlorosilyl)-amine, (HSiCl22NH, and bis(dichlorosilyl)methylamine, (SiHCl2)2NMe, have been investigated by electron diffraction and ab initio calculations on a MP2/6-31G* level. Because the latter suggest the presence of a mixture of two conformers for each molecule, attempts were made to fit the electron diffraction data in each case by two different models, one assuming the presence of only one conformation, and another allowing for two different conformers. The principal parameters (ra) from electron diffraction for (HSiCl2)2NH are (the appropriate ab initio calculated values are given in brackets []): r(Si-N) 171.9(2) [172.7], r(Si-Cl) 204.1(1)[204.5] pm; Si-N-Si 126.5(8) [127.4] N-Si-Cl 107.3(5) [110.8] and Cl-Si-Cl 106.5(3) [107.5]°. For (SiHCl2)2NMe: r(Si-N) 171.1(3) [171.5], r(Si-Cl) 204.0(9) [205.2], r(N-C) 149.7(10) [148.3] pm; Si-N-Si 124.9(13) [123.4], N-Si-Cl 109.7(5) [110.7] and Cl-Si-Cl 107.1(3) [107.2]° [110.8] and Cl-Si-Cl 106.5(3) [107.5]°. For (SiHCl2)2NMe: r(Si-N) 171.1(3) [171.5], r(Si-Cl) 204.0(9) [205.2], r(N-C) 149.7(10) [148.3] pm; Si-N-Si 124.9(13) [123.4], N-Si-Cl 109.7(5) [110.7] and Cl-Si-Cl 107.1(3) [107.2]°. For (HSiCl2)2NH three different conformers were found to fit the experimental data with the single-conformation model. In two of the conformers, the dichlorosilyl groups are twisted by Θ1 = 146.0(10)/Θ2 = 155.2(20)° and Θ1= 101.1(49)/Θ2 = 196.8(12)°; respectively counterclockwise from the positions in which the Si-H bonds eclipse the N-H bond. Both of these lead to nearly ideally staggered conformations of the two SiHCl2 groups when viewed along the Si-Si axis. In contrast, the third conformation is nearly eclipsed, with torsion angles Θ1 = 131.4(15)/Θ2 = 80.4(26)°. Planarity of the Si2NH group was assumed as suggested by ab initio calculation. For (HSiCl2)2NMe the experimental data could be suitably fitted by two conformers, in which the dichlorosilyl groups are twisted by Θ1= 161.8(13)/Θ2 = 63.1(23)° and Θ1 = 156.1(9)/ Θ2 = 177.1(15)° from the positions in which the Si-H bonls eclipse the N-C bond. The first of these structures has an eclipsed Si(NSi)Cl conformation and an Si…Cl nonbonded distance close to distance clse to the sum of the appropriate van der waals radii. MP2/6-31G* calculations support the GED bond lengths and bond angles of both molecules, but indicate different conformations for the most stable equilibrium geometries: the computed twists are Θ1 = 180/Θ2 = 180° and Θ1 = 177.0/ Θ2 = 183.0° for (HSiCl2)2NH and (HSiCl2)2NMe, respectively. Rotation about the Si - N bonds is a very facile process, cf. the computed [MP2/6-31G*//MP2/6-31G* + ZPE(SCF/6-31G*)] rotational barrier of 2.9 kJ. mol-1 for (HSiCl2)2NH.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19951280812
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  • 7
    Digitale Medien
    Digitale Medien
    Synthese und Komplexchemie funktionalisierter Tripod-Liganden RC(CH2PPh2)3Manfred Ziegler zum Gedenken. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 63-70 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Tripod ligand synthesis ; Tripod nickel chloro complexes ; Tripod iron tris(acetonitrile) complexes ; Tripod cobalt acetate complexes ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Synthesis and Complex Chemistry of Functionalised Tripod Ligands RC(CH2PPh2)3Malonic ester 1 is alkylated and converted into the triols RC(CH2OH)3 (5). These are easily converted into the corresponding functionalised tripodal ligands RC(CH2PPh2)3 (7) with R = Bzl (a), n-C12H25 (b), (CH3)2CH(CH2)2 (c). Crystals suitable for X-ray crystallography have been obtained of the ligand 7a. In addition, the tripod ligands 7a and 7c have been further characterized by the syntheses and X-ray analyses of the nickel complex [(7a)NiCl] (8a), the iron complex [(7c)Fe(NCCH3)3](BF4)2 [9 · (BF4)2], and the cobalt complex [(7c)Co{O(O)CCH3}](BPh4) (10 · BF4).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19951280109
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  • 8
    Digitale Medien
    Digitale Medien
    Chemoprvention traials in the cervix: Design, feasibility, and recruitment (1995)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 59 (1995), S. 104-112 
    Details
    ISSN: 0730-2312
    Schlagwort(e): Chemoprevention ; cervical intraepithelial neoplasia ; fluorescence spectroscopy ; squamous intraepithelial lesion ; Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: The cervix is an ideal organ for chemoprevetion studies and the study of squamous carcinogenesis. In chemoprevention trial design, four factors are important: high-risk cohorts must be identified; suitable agents must be selected; study designs should include Phase I, II and III; and studies should include the use of surrogate endpoint biomarkers. High-risk cohorts can be selected for Phase I, II and III trial in the cervix, for example, patients with high grade lesion such as cervical interaepithelial neoplasia (CIN) grade 3 and carcinoma in situ (CIS). A Phase III trial might also include patients with lesions infected with ocogenic HPV types. The cervix is accessible and can be safely followed with Papanicolaou (Pap) smears and colposcopy. Suitable agents include those likely to work in squamous lesions, including retinoids, difluoromethylornithine β-carotene, and others. In Phase I chemopreventive studies, does are de-escalated rather than escalated, determining toxicity and optimal dose schedule. Phase II studies looking at effectiveness need placebo control groups since regression of high-risk lesions is possible. Phase III studies, now multicenteric, should be carefully designed and include wide patient representation in order to evaluate the risk-benefit ratio of therpy, focusing on cancer incidence reduction. Surrogate endpoint biomarkers include quantitative histopathology, biologic measures of histopathologic markers include nuclear grading (i.e., shape, area, optical density, texture), nuclear pleomerphism, ploidy, and nucleolar size and position. Biomarkers under study at the present time in the cervix include proliferation markers (PCNA), regulation markers (EGFR, ras, myc, p53, retinoic acid receptors, ODC, spermidine/spermine ratios), differentiation markers (involucrin, cornifin, keratins), and markers of genetic instability (chromosome polysomy). Fluorescent spectroscopy uses light to probe the biochemical properties of tissue. This technique provides an automated diagnosis in real time with comparable sensitivity and specificity to colposcopy and can be used to monitor lesions in chemoprevention trials. Recruitment designs for cervix studies need to include a large referral population and patients with sufficiently large lesions. Clinicians involved in such studies need to stress contraception and smoking cessation, deal with language barriers, and provide compensation for child care and parking to patients in order to increase compliance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jcb.240590914
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  • 9
    Digitale Medien
    Digitale Medien
    Oxytocin induced a biphasic increase in the intracellular Ca2+ concentration of porcine myometrial cells: Participation of a pertussis toxin - insensitive G-protein, inositol 1,4,5-trisphosphate - sensitive Ca2+ pool, and Ca2+ channels (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 41 (1995), S. 20-28 
    Details
    ISSN: 1040-452X
    Schlagwort(e): Myometrium ; Oxytocin ; Intracellular Ca2+ concentration ; Ca2+ channels ; Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: This study investigated the underlying mechanisms of oxytocin (OT)-induced increases in intracellular Ca2+ concentrations ([Ca2+]i) in acutely dispersed myometrial cells from prepartum sows. A dosedependent increase in [Ca2+]i was induced by OT (0.1 nM to 1 μM) in the presence and absence of extracellular Ca2+ ([Ca2+]e). [Ca2+]i was elevated by OT in a biphasic pattern, with a spike followed by a sustained plateau in the presence of [Ca2+]e. However, in the absence of [Ca2+]e, the [Ca2+]i response to OT became monophasic with a lower amplitude and no plateau, and this monophasic increase was abolished by pretreatment with ionomycin, a Ca2+ ionophore. Administration of OT (1 μM) for 15 sec increased inositol 1,4,5-trisphosphate (IP3) formation by 61%. Pretreatment with pertussis toxin (PTX, 1 μg/ml) for 2 hr failed to alter the OT-induced increase in [Ca2+]i and IP3 formation. U-73122 (30 nM to 3 μM), a phospholipase C (PLC) inhibitor, depressed the rise in [Ca2+]i by OT dose dependently. U-73122 (3 μM) also abolished the OT-induced IP3 formation. Thapsigargin (2 μM), an inhibitor of Ca2+-ATPase in the endoplasmic reticulum, did not increase [Ca2+]i. However, it did time-dependently inhibit the OT-induced increase in [Ca2+]i. Nimodipine (1 μM), a Voltage-dependent Ca2+ channel (VDCC) blocker, inhibited the OT-induced plateau by 26%. La3+ (1 μM), a nonspecific Ca2+ channel blocker, abrogated the OT-induced plateau. In whole-cell patch-clamp studies used to evaluate VDCC activities, OT (0.1 μM) increased Ca2+ Current (Ica) by 40% with no apparent changes in the current-voltage relationship. The OT-induced increase in Ica reached the maximum in 5 min, and the increase was abolished by nimodipine (1 μM). These results suggested that (1) activation of OT receptors in porcine myometrium evokes a cascade in the PTX-insensitive G-protein-PLC-IP3 signal transduction, resulting in an increase in [Ca2+]i; (2) the OT-induced increase in [Ca2+]i is characterized by a biphasic pattern, in which the spike is predominately contributed by the intracellular Ca2+ release from the IP3-sensitive pool, and to a lesser extent by Ca2+ influx, whereas the plateau is from increased Ca2+ influx; and (3) the influx is via VDCC and receptor-operated Ca2+ channels. © 1995 Wiley-Liss, Inc.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrd.1080410105
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  • 10
    Digitale Medien
    Digitale Medien
    Effects of concurrent exposure to 60 Hz electric and magnetic fields on the social behavior of baboons (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 16 (1995), S. 71-92 
    Details
    ISSN: 0197-8462
    Schlagwort(e): Papio cynocephalus anubis ; biological effects ; central nervous system ; nonhuman primates ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Physik
    Notizen: Our previous research has demonstrated that 30 or 60 kV/m electric fields (EF) reliably produce temporary increases in the performance of three categories of baboon social behavior: Passive Affinity, Tension, and Stereotypy. The experimental design included 6 week preexposure, exposure, and postexposure periods with experimental and control groups, each with eight subjects. Here, we report two experiments that evaluated the effects of combined EF and magnetic fields (MF) on baboon social behavior. One experiment demonstrated that exposure to 6 kV/m EF and 50 μT (0.5 G) MF produced Period × Group interactions for Stereotypy and Attack, but the previously observed increases in Passive Affinity, Tension, and Stereotypy did not occur. A second experiment demonstrated that exposure to 30 kV/m EF and 100 μT 1.0 G MF did not produce the same magnitude of increases in Passive Affinity, Tension, and Stereotypy observed previously with 30 kV/m EF alone. The exposed group exhibited decreased performance rates for several behavior categories during exposure with further declines during postexposure. The control group showed fewer downward trends across periods. © 1995 Wiley-Liss, Inc.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bem.2250160708
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