bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characterization of neurotrophin receptors by affinity crosslinking
Authors: Escandón E. , Burton L. E. , Szönyi É. , Nikolics K. 
Published: May 2005

AbstractNeurotrophic factors regulate the developmental survival and differentiation of specific neuronal populations. Brain‐derived neurotrophic factor (BDNF) and neurotrophin‐3 (NT‐3) are members of the nerve growth factor (NGF) protein family, also known as the neurotrophins. Insights into the different roles of neurotrophins can be gained by studying the expression of their functional receptors. Here we report the development of procedures for their radiolabeling and efficient crosslinking to specific cell‐surface receptors. BDNF and NT‐3 receptors in cell lines and tissue preparations expressing receptors for the 2 neurotrophins have been identified using this affinity crosslinking procedure. Like NGF, BDNF and NT‐3 crosslinking to the low affinity NGF receptor (p75NGFR) on PC12 cells. BDNF and NT‐3 also crosslinked to cells expressing p145trkB protein, producing an approximately 160 kD neurotrophin‐receptor complex. Crosslinking of the 2 neurotrophins in vivo to specific trk family members in many areas of the central nervous system also produced a 160 kD receptor complex. However, in all brain regions a complex of approx. 100 kD could also be identified, all or most of which represents crosslinking to a truncated from of trkB. The broad distribution of BDNF and NT‐3 receptors throughout the CNS suggests that neurotrophins may have yet unrecognized functions on specific neuronal populations. BDNF and NT‐3 receptors were also found in brain areas in which the neurotrophins themselves are also synthesized, suggesting that beyond long‐range trophic effects, these proteins may also act as autocrine or short‐range paracrine regulators. © 1993 Wiley‐Liss, Inc.
T‐Cadherin 2: Molecular characterization, function in cell adhesion, and coexpression with T‐cadherin and N‐cadherin
Authors: Sacristán M. P. , Vestal D. J. , Dours‐Zimmermann M. T. , Ranscht B. 
Published: May 2005

AbstractCadherins are integral membrane glycoproteins that mediate calcium‐dependent, homophilic cell‐cell adhesion and are implicated in controlling tissue morphogenesis. T‐cadherin is anchored to the membrane through a glycosyl phosphatidylinositol (Ranscht B, Dours‐Zimmermann MT: Neuron 7:391–402, 1991) and expressed in a restricted pattern in developing embryos (Ranscht B, Bronner‐Fraser M: Development 111:15–22, 1991). We report here the molecular and functional characterization of the T‐cadherin isoform, T‐cadherin 2 (Tcad‐2) and the expression of the corresponding mRNA. Tcad‐2 cDNA differs in its 3′nucleotide sequence from T‐cadherin cDNA and encodes a protein in which the carboxy terminal Leu of T‐cadherin is substituted by Lys and extended by the amino acids SerPheProTyrVal. By RNase protection, mRNAs encoding the T‐cadherin isoforms are coexpressed in heart, muscle, liver, skin, somites, and in neural tissue. Many tissues contain both T‐cadherin and Tcad‐2 mRNAs in conjunction with N‐cadherin transcripts, and T‐cadherins and N‐cadherin proteins are coexpressed on the surface of individual neurons in vitro. Expression in Chinese hamster ovary cells (CHO) revealed that Tcad‐2 is a glycosyl phosphati‐dylinositol‐anchored membrane protein that functions in calcium‐dependent, homophilic cell adhesion. The identification of a functional T‐cadherin isoform and the coexpression of T‐cadherins and N‐cadherin by individual cells suggest that specific adhesive interactions of embryonic cells may involve a complex interplay between multiple cadherins. © 1993 Wiley‐Liss, Inc.
Neuron‐Schwann cell signals are conserved across species: Purification and characterization of embryonic chicken Schwann cells
Authors: Bhattacharyya A. , Brackenbury R. , Ratner N. 
Published: May 2005

AbstractA monoclonal antibody, 1E8, which recognizes the peripheral myelin protein, Po, specific for chicken Schwann cells and their precursors (Bhattacharyya et al., Neuron7:831‐844, 1991), was used to immunoselect Schwann cells from embryonic day 14 (E14) chicken sciatic nerve. When cultured, these immunoselected cells displayed properties characteristic of perinatal rodent Schwann cells, including S100‐immunoreactivity and 04 antigen‐immunoreactivity. In addition, the purified chicken Schwann cells divided slowly when cultured alone, but when co‐cultured with chicken or rat sensory neurons, they bound to axons and proliferated. Proliferation was also stimulated by the addition of bovine brain membrane extracts or chicken brain membranes. The IE8 monoclonal antibody was also used to test the effect of axonal contact on P0 expression. Chicken Schwann cells purified using the 1E8 monoclonal antibody gradually lost P0 when cultured alone. These cells remained 1E8‐negative even after prolonged co‐culture with embryonic rat dorsal root ganglion neurons or chicken sensory ganglia. These results demonstrate that chicken Schwann cells behave like rodent Schwann cells in their expression of specific antigens, interactions with axons, and regulation of P0 expression. In addition, chicken Schwann cells respond to neuronal signals from the rat and cow, illustrating the cross‐species conservation of these signals. © 1993 Wiley‐Liss, Inc.
Raman studies of nucleic acids. IX: A salt‐induced structural transition in poly(rG)
Authors: Rice J. , Lafleur L. , Medeiros G. C. , Thomas G. J. 
Published: May 2005

AbstractRaman spectra of poly(rG), obtained from neutral aqueous solutions containing excess sodium counterions, are qualitatively different than spectra obtained from salt‐free solutions. In the presence of a two‐fold molar excess of Na+ (per phosphate group) the Raman spectrum of poly(iG) closely resembles that of the gel of Guo‐5′‐P and is characteristic of an ordered helical structure in which guanine residues are hydrogen bonded to one another. In the absence of added salt the spectrum of poly(rG) is characterized by unusual guanine ring frequencies which suggests a tautomeric or ionic modification of the ordinary (keto‐amino) ring structure. Both the high‐salt and no‐salt forms of poly(rG) represent stable secondary structures as evidenced by the conformationally sensitive phosphodiester frequencies and by the absence of significant spectral changes on heating the solutions.
Low frequency Raman spectra of hexamethylbenzene crystal
Authors: Suzuki Masako 
Published: May 2005

AbstractLow frequency Raman spectra (below 200 cm −1) of hexamethylbenzene and hexamethylbenzene‐d18 were measured in all the crystalline phases. (I, II, and III) and in the liquid phase. Two bands were observed in each crystalline phase. Vibrational analysis was done on the basis of deuteration effect and polarized Raman spectra of single crystal, effect of intermolecular forces was also considered. The nature of the low frequency vibrations is discussed in each phase.
Vibrational spectra of SO2F2 in the condensed states
Authors: Nolin C. , Tremblay J. , Savoie R. 
Published: May 2005

AbstractThe presence of three fundamentals in the 545 cm−1 region of the vibrational spectrum of sulfuryl fluoride has been confirmed from the Raman spectrum of the liquid. Evidence for the occasional formation of a metastable crystalline form upon solidification of SO2F2 has been gathered from the infrared study. The Raman investigation has also shown that the most stable crystalline solid (phase I) is seldom directly obtained upon freezing this compound. Both types of spectra indicate that the two stable crystalline phases (I and II) have well‐ordered, although rather complex structures. The crystals are probably centrosymmetric in both cases, with at least 8 molecules located on general positions of the unit cell. The crystal system is other than triclinic or monoclinic. Cubic symmetry is further eliminated in the case of phase II.
The rotational and rotation‐vibrational Raman spectra of 14N2, 14N15N and 15N2
Authors: Bendtsen Jørgen 
Published: May 2005

AbstractThe pure rotational and rotation‐vibrational Raman spectra of 14N2, 14N15N and 15N2 have been photographed using a previously described instrument. The analyses of the bands yield for each molecule v0, B0, B1‐B0 and D. From the values of B0 and B0‐B1 the internuclear distances re are calculated independently for each species. Within the experimental accuracy the distances are identical as required by the Born‐Oppenheimer approximation. The mean value for re is 1.097701 ± ± 0.000004 Å.
A Czerny‐Turner spectrograph incorporating a 2‐stage image intensifier for the study of very weak Raman spectra
Authors: Willetts D. V. , Freedman P. A. , Jones W. J. 
Published: May 2005

AbstractA Czerny‐Turner spectrograph is described in which an image intensifier is positioned in front of the photographic plate. This system shows a large gain in sensitivity over conventional spectrographs without serious loss of resolution. The reciprocity failure of this detection system is found to be very low.
Raman spectra of vibrational modes in spinel CdIn2S4
Authors: van Den Boom H. , Haanstra J. H. 
Published: May 2005

AbstractWe here present the results of a Raman investigation on powders and oriented single crysstals of CdIn2S4 spinel, nominally pure and doped with Fe.The k  0 fundamental phonon frequencies are: 184 cm−1 (Eg), 242 cm−1 (F2g), 307 cm−1 (F2g) and 362 cm−1 (A1g). An additional first order vibration, which is ascribed to a local mode of Fe in tetrahedral sulphur surroundings, is found at 340 cm−1 and has A1g‐symmetry.
The vibrational spectrum of OH ion
Authors: Huong P. V. , Desbat B. 
Published: May 2005

AbstractThe vibrational assignment of the hydroxonium ion, OH, is made with the help of Raman polarization measurements on solutions containing OHSbCl in CH2Cl2. The symmetric stretching frequency is found to be greater than the asymmetric mode. This order is the reverse of that observed in ammonia and other XH3 molecules.
Resonance Raman spectroscopic study of titanium tetraiodide in different organic solvents: Spectroscopic constants and half‐band widths for the ν1 (a1) vibration
Authors: Clark R. J. H. , Mitchell P. D. 
Published: May 2005

AbstractResonance Raman spectra have now been observed from solutions of titanium tetraiodide in five organic solvents. High intensity overtone progressions of the v1 (a1) vibration extend to 9v1–13 v1, and these progressions have permitted the determination of the spectroscopic constants ω1 and x11 for each solution. The latter are compared with values obtained from solid state measurements. Little variation is found in ω1 (161.6–160.9 cm−1) and none in x11 (0.08±0.02 cm−1) with change of solvent or state. The members of the overtone progressions decrease in intensity and increase in half‐bandwidth with increase in the vibrational quantum number.
A Raman spectroscopic study of the dissociation of chloromethyl mercuric nitrate in a queous solutions
Authors: Edwards Howell G. M. , Woodward L. A. 
Published: May 2005

AbstractRaman spectroscopic evidence shows that chloromethyl mercuric nitrate, ClCH2 HgONO2 (like methyl mercuric nitrate), is only partially dissociated into ions in aqueous solution. The percentage degree of dissociation in a nearly saturated solution (0.078 M) at 25°C, as determined by intensity measurements on the v1 Raman line of the nitrate ion, is found to be approximately 83 ± 7. This corresponds to a value of the dissociation constant Kc near 0.3 moles per liter. Thus the effect of introducing a Cl atom into the methyl group of CH3HgONO2 is to reduce Kc by a factor of about 100. This is in the opposite sense from the effect of a similar substitution in the case of acetic acid CH3COOH, which is to increase the acid dissociation constant Kc by a factor of about 100. These effects can be qualitatively understood in terms of the inductive effects of the Cl atom.
Raman spectra of gaseous and solid N2F4
Authors: Durig J. R , Macnamee R. W. 
Published: May 2005

AbstractThe Raman spectrum of gaseous N2F4 at a pressure of 760 torr was recorded with a spectral slit width of 3 cm−1. Ten of the expected eleven fundamentals of the symmetric motions of both the gauche and trans isomers give rise to strongly polarized Raman lines. These new data require a reassignment of some of the fundamentals for both the C2 and C2h conformers. The Raman of the solid at 18K was also recorded. Both conformers were found in the solid even after annealing the sample for 9 hours at a temperature of 101.6K and 3 hours at a temperature of 106.8K. Bands attributable to the gauche isomer became more intense relative to those for the trans isomer after several hours of annealing.
Theoretical and experimental resonance Raman intensities for the manganate ion
Authors: Chao R. S. , Khanna R. K. , Lippincott E. R. 
Published: May 2005

AbstractResonance Raman spectra are reported for potassium manganate powder employing a number of exciting frequencies within the electronic absorption region of the material.In analyzing the observed variations in the relative intensities for resonance effects we have considered δM/δq (M = transition moment and q = normal coordinate) as the dominant term in the theoretical derivation of the expression for Raman intensity. This approach leads to excellent agreement between the experimental intensity data on both the fundamental as well as the first overtone of the symmetric stretching mode of the MnO ion and the derived theoretical expressions.
Solution and single crystal Raman spectra of potassium hexacyanomanganate (III)
Authors: Jensen P. Waage 
Published: May 2005

AbstractThe complete single crystal Raman spectra of K3Mn(CN)6 and the Raman spectrum of an aqueous solution of this compound were recorded at room temperature. The number of lines with low wave numbers makes it possible to exclude a crystal structure composed solely of unit cells with the monoclinic space group C. All spectral data are in agreement with space group D. An OD‐structure can not be ruled out, but no positive evidence has been found for it. In the solution Raman spectrum all Raman active vibrations of the free ion are observed.
Phase transition in 1,8‐dinitronaphthalene; Raman spectra
Authors: Mierzejewski A. , Luty T. 
Published: May 2005

AbstractLattice vibration frequencies of the low‐temperature modification (below 391 K) of 1,8‐dinitronaphthalene have been observed. The temperature dependence of the frequencies is discussed in relation to the phase transition mechanism.
Analyse Conformationnelle de la 2 Pentanone par Spectroscopie Raman
Authors: Roussel Bernard , Chapput André , Fleury Guy 
Published: May 2005

AbstractLes spectres Raman de la 2‐pentanone ont été enregistrés à l'état liquide, solide et vapeur. Le spectre à basse température présente un nombre limité de raies dû à la disparition de toutes les espèces rotamères exceptée l'espèce la plus stable. De la variation en température de certains groupes de raies, il est possible de déterminer la différence d' enthalpie entre chaque espèce rotamèce rotamère dans la phase liquide.
Lattice vibrations in spectrum of thallous nitrate
Authors: Kondilenko I. I. , Korotkov P. A. , Golubeva N. G. 
Published: May 2005

AbstractRaman and infrared spectra of thallous nitrate have been studied in the region 30 to 2000 cm−1 for the temperature interval 80 to 460 K. The bands recorded in TINO3 (III) correspond to (νi + Ωj) composite transitions where νi refers to internal and Ωj to lattice vibrations. There are two sets of nitrate ions in the unit cell because of the observed splitting of the internal bands of the NO group and also the doubling of some bands due to lattice vibrations.
Raman and infra‐red spectra, normal coordinate analysis and conformation of 1,3‐cycloheptadiene
Authors: Ansmann Achim , Schrader Bernhard 
Published: May 2005

AbstractThe Raman and infrared spectra of liquid samples of 1,3‐cycloheptadiene have been studied in the range 3500–100 cm−1. Using a Valence Force Field previously obtained from other conjugated dienes, the vibrational frequencies of 1,3‐cycloheptadiene are calculated for a C2 and Cs conformation of the molecule which both have been proposed as reasonable structures from other spectroscopic evidence. By comparison it is concluded that normal coordinate calculation and vibrational spectra are consistent with a Cs conformation of the cycloheptadiene ring. On the basis of this the vibrational assignment of 1,3‐cycloheptadiene is given.
Visible and near‐ultraviolet resonance Raman spectra of photolabile vitamin B12 derivatives with a rapid‐flow technique
Authors: Salama Simon , Spiro Thomas G. 
Published: May 2005

AbstractResonance Raman spectra, obtained with 5145, 4880 and 3638 Å excitation, are reported for aquo‐, methyl‐, 5′‐deoxyadenosyl‐(coenzyme B12), thiosulfate and cysteinyl cobalamin, of methyl cobinamide, and of Co(II) cobalamin (B12r). Laser‐induced photodecomposition was held to acceptable levels with a rapid‐flow technique. A rich assortment of corrin ring vibrations are observed above 600 cm−1, but the frequencies are constant (within ±3 cm−1) for all the derivatives. Some Raman bands show differential enhancement by the visible and near‐ultraviolet electronic transitions, reflecting their different polarizations. B12r shows large relative intensity changes in bands at 1500 and 1600 cm−1, with respect to the Co(III) derivatives. Despite an absorption spectrum resembling that of B12r, methyl cobinamide shows Raman intensity behavior typical of the other Co(III) derivatives.
Systematic interpretation of Raman spectra of organic compounds. II‐Ethers
Authors: Visser T. , Van Der Maas J. H. 
Published: May 2005

AbstractThe Raman spectra of 80 ethers have been recorded and the characteristic frequencies are reported. Correlations between frequencies and structure have been investigated. The collected data have been incorporated into the interpretation system for carbonhydorgen and hydroxy compounds; the different ways of handling are discussed.
Recording of Raman spectra of highly fluorescent substances by means of inverse Raman scattering
Authors: Werncke W. , Lau A. , Weigmann H.‐J. , Buge H.‐G. , Reich P. 
Published: May 2005

AbstractSubstantial progress has been made in spontaneous Raman spectroscopy by the use of lasers as a source of excitation radiation. Moreover the development of high‐power pulse lasers provided access to a new class of scattering processes‐the non‐linear Raman effects. The methodical development of the non‐linear Raman effects is now at a state whereby in special cases it is possible to obtain better spectra than with the use of spontaneous Raman scattering. This paper describes one of the non‐linear Raman effects—inverse Raman scattering—on some samples taken from two groups of technically interesting substances.
Pure rotational Raman spectra of hydrazoic acid HN3 and DN3
Authors: Bendtsen Jørgen 
Published: May 2005

AbstractThe pure rotational Raman spectra of HN3 and DN3 have been photographed in the spectral range −100 cm−1 to 470 cm−1. The very intense ΔK = O transitions, QRK(J) and QSK(J), and the weak asymmetry‐allowed ΔK = 1 and 2 transitions, RQK, SQK, RSK (J) and SSK(J), were observed and measured. The analyses of the spectra with ΔK ≠ 0 primarily yield information on the K‐dependent parameters of the molecules. For HN3 the following constants have been determined: A = 20.3815(25) cm−1; DK = 8.706(92) × 10−3; HK = 7.38(93) × 10−6 cm−1. For DN3 the results are A = 1.4916(24)cm−1; DK = 2.931(36) × 10−3 cm−1; HK = 2.00(32) × 10−6cm−1.
First‐order A1(TO) phonons as evidence of disorder in BaTiO3
Authors: Verble J. L. , Gallego‐Lluesma E. , Porto S. P. S. 
Published: May 2005

AbstractEvidence is presented, based on Raman scattering measurements, that the three modes observed in the A1(TO) phonon spectrum of tetragonal BaTiO3 are first order. These results are interpreted as supporting the order‐disorder model of the ferroelectric phase transition.
Time‐reversal symmetry in light‐scattering theory
Authors: Loudon R. 
Published: May 2005

AbstractThe general connections between Stokes and anti‐Stokes cross sections are examined on the basis of the time‐reversal symmetry of light‐scattering experiments. The corresponding symmetry properties of the transition rates, susceptibilities and Green functions which occur in light‐scattering theory are reviewed. A rigorous Stokes‐anti‐Stokes connection formula is derived and compared with an approximation in common use.
Raman investigation of the phase transition in solid cyclohexane
Authors: Rohrer U. , Falge H. J. , Brandmüller J. 
Published: May 2005

AbstractThe Eg vibration at 1268 cm−1 of cyclohexane is investigated by Raman scattering near the phase transition at 186 K. Within an interval of 1.5 K below the phase transition this band is split into five components with changing intensities. The spectra confirm the existence of a metastable phase. From the site and factor group of the stable phase the assignment of the absorption band at 862 cm−1 in the infrared spectrum is established.
Low‐frequency vibrational spectrum of p‐nitrotoluene single crystals
Authors: Abasbegović N. , Colombo L. , Le Postollec M. 
Published: May 2005

AbstractThe lattice vibrational spectrum of p‐nitrotoluene (PNT) single crystals has been studied by Raman and IR spectroscopic techniques. Twenty‐one lines have been recorded in the Raman spectrum and nine lines in the far IR spectrum. Calculations of vibrational frequencies have been performed using the rigid molecule approximation. Intermolecular interactions have been described by atom‐pair intermolecular potential functions for interatomic distances up to 4.0 Å. An assignment of the observed to the calculated frequencies has been proposed.
Infrared and Raman polarized spectra of monoclinic KD2PO4 crystal
Authors: Ratajczak H. , Baran J. 
Published: May 2005

AbstractThe polarized infrared transmission (2500–300 cm−1) and polarized Raman (2500–10 cm−1) spectra of a single crystal of monoclinic KD2PO4 have been obtained. The spectra are discussed in relation to the crystal structure and properties of the hydrogen bonds.
CH stretching vibrations of pyrazole and of its deuterated species. Anharmonicity of modes and molecular pseudo‐symmetry
Authors: Tabacik Vlado , Sportouch Serge 
Published: May 2005

AbstractThe three ν(CH or CD) fundamentals of pyrazole‐D0 (1a) of its deuterated NH species, −4‐D1 (2a), −3,5‐D2 (3a), −3,4,5‐D3 (4a), and ND species, −1‐D1 (1b), −1,4‐D2 (2b), −1,3,5‐D3 (3b), ‐D4 (4b), were obtained by Raman spectroscopy. Each a, b couple (i.e. 1a, 1b, etc.) gives identical ν(CH or CD) bands. One band originates essentially in the stretching of the atom (H or D) in position 4. Two other bands originate essentially in the stretching movements of the atoms in positions 3 and 5. The relation of infrared to Raman intensity, the relative intensity of bands in infrared, the relative position of bands, the application of isotropic rules and the determination of mode anharmonicity constants provide a C2ν‐like image of these Cs‐symmetrical molecules.
Raman studies on dinucleoside monophosphates. I—sequence and temperature dependence of structure and conformation of adenine derivatives in neutral aqueous solution
Authors: Gramlich V. , Herbeck R. , Schlenker P. , Schmid E. D. 
Published: May 2005

AbstractRaman spectra of the dinucleoside monophosphates ApG, GpA, ApC, CpA, ApU, UpA and ApA are reported and discussed. Our measurements show that the sequence isomers have different relative conformations owing to different intra‐ and intermolecular interactions. The most striking differences are found between ApG and GpA. The intensity of the 730 cm−1 ring breathing vibration of adenine has been determined quantitatively. We find that the intensity of this mode is sequence‐dependent.