bluuebunny/crossref_metadata_2025_split huggingface dataset:
Idiopathic CD4+ lymphocytopenia and juvenile laryngeal papillomatosis
Authors: Pasic Srdjan , Minic Predrag , Dzudovic Slobodan , Minic Aleksandra , Slavkovic Bojana 
Published: January 2005

AbstractWe report on an association of idiopathic CD4+ lymphocytopenia (ICL) and juvenile laryngeal papillomatosis (JLP) in a pediatric‐aged patient. Because of a past medical history of recurrent lung infections and severe chickenpox in infancy, immunologic investigations were done at age 6 years. On several occasions, a CD4+lymphocyte count of <300 cells/mm3 was detected, supporting the diagnosis of ICL. During follow‐up, both medical (interferon‐alpha) and surgical treatments of JLP were only partially efficient. Our patient developed disseminated infection with Mycobacterium avium and died at 10 years of age. Human papillomavirus is an important pathogen in pediatric and adult patients with ICL. In pediatric patients with JLP who develop other unusually severe viral or opportunistic infections, immunological investigations should be considered. Pediatr Pulmonol. 2005; 39:281–283. © 2005 Wiley‐Liss, Inc.
Timing and nature of wheezing at the endpoint of a bronchial challenge in preschool children
Authors: Godfrey Simon , Cohen Shlomo , Avital Avraham , Springer Chaim 
Published: January 2005

AbstractBronchial reactivity to inhaled agents in preschool children can be undertaken by auscultating the lungs to detect wheezing, but there is a lack of information on when wheeze first appears at the endpoint of the challenge and on the acoustic characteristics of the wheeze. We recorded breath sounds continuously during tidal breathing inhalation challenges with adenosine 5′‐monophosphate, using sensors attached over each upper lobe in 80 preschool children. In 35 children, the challenge was considered positive by a pediatrician who determined the endpoint by detecting wheeze on auscultation after an inhalation. Using acoustic analysis, we determined that the first wheeze appeared during the 2‐min period of nebulization in 31% of positive challenges; it was unilateral in 37%, and only inspiratory in 46%. A running window of 6 sec was used to detect at least two wheezes without reference to phase of breathing, and this index had a sensitivity of 97.6% and specificity of 99.7% for determining the endpoint of a challenge. Detecting wheeze acoustically adds safety to the technique by enabling the challenge to be stopped earlier, while the lack of a need to document the phase of breathing simplifies the technique. Pediatr Pulmonol. 2005; 39:262–267. © 2005 Wiley‐Liss, Inc.
Prevalence of obstructive sleep apnea syndrome and associated symptoms in 3–11‐year‐old Turkish children
Authors: Sogut Ayhan , Altin Remzi , Uzun Lokman , Ugur Mehmet Birol , Tomac Nazan , Acun Ceyda , Kart Levent , Can Gunay 
Published: January 2005

AbstractOur objective was to investigate the prevalence of sleep‐disordered breathing (SDB) and obstructive sleep apnea syndrome (OSAS) in 3–11‐year‐old Turkish children. A cross‐sectional study was conducted in Zonguldak, northwestern Turkey. Symptomatic children were identified by using a self‐administered questionnaire and were classified into three groups: nonsnorers, occasional snorers, and habitual snorers. All habitual snoring children were invited to undergo polysomnography (PSG). Nine hundred fifty‐four children (79.5%) were nonsnorers, 205 (17.2%) were occasional snorers, and 39 (3.3%) were habitual snorers. There was no significant relationship between gender and habitual snoring (male, 3.4%; female, 3.1%; P > 0.05; odds ratio (OR), 1.13; 95% confidence interval (CI), 0.59–2.14). There was a statistically significant relationship between habitual snoring and allergic rhinitis (OR, 4.23; 95% CI, 2.14–8.35). Four children who snored every night, and who had apnea spells and/or troubled sleep, underwent adenoidectomy and/or tonsillectomy before polysomnographic evaluation because of clinical detoriation. Twenty‐eight of 39 children with habitual snoring participated in PSG evaluation. PSG revealed that 11 children (0.9% of the total population) had OSAS. When 4 operated children were added to these 28 children, we found the minimum prevalence of OSAS to be 1.3% in our study group. There was a significant correlation between OSAS and troubled sleeping (P < 0.001; OR, 4.37; 95% CI, 1.33–14.3). We found the prevalence of habitual snoring to be 3.3% in Turkish children by using self‐administered questionnaires. Allergic rhinitis was significantly correlated with habitual snoring. Minimum estimated prevalence of OSAS was found to be 1.3%. Pediatr Pulmonol. 2005; 39:251–256. © 2005 Wiley‐Liss, Inc.
Mycobacterium gastri causing disseminated infection in children of same family
Authors: Velayati Ali Akbar , Boloorsaze Mohammad Reza , Farnia Parissa , Mohammadi Foroozan , Karam Mehrdad Bakshayesh , Soheyla‐Zahirifard  , Masjedi Mohammad Reza 
Published: January 2005

AbstractTwo children of the same family were admitted to the pediatric ward with a history of productive cough, nocturnal sweats, and weight loss. On physical examination, lymphadenopathy was seen on both sides of the neck and axillae. The sizes of the lymph nodes varied, and some showed fistula formation with drainage. A chest x‐ray of the boy revealed diffuse nodular densities, while in the girl, peribronchial thickening in both lower lung zones and hilar adenopathy were detected. Sonography of the abdomen and pelvis in both cases showed multiple para‐aortic adenopathies with hypodense centers. Microscopic examination of sputum, gastric washings, and node biopsy specimens proved positive for acid‐fast bacilli. Systematic identification of acid‐fast bacilli on Lowenstein‐Jensen culture media identified the isolates as Mycobacterium gastri. These appear to be the first cases of pediatric infection and the fourth report of human infection caused by this atypical Mycobacterium. Pediatr Pulmonol. 2005; 39:284–287. © 2005 Wiley‐Liss, Inc.
Blood transfusion and pulmonary lipid peroxidation in ventilated premature babies
Authors: Collard Keith J. , Godeck Sarah , Holley Janet E. 
Published: January 2005

AbstractUrinary malondialdehyde (MDA; a biochemical marker of lipid peroxidation) is increased following the receipt of blood transfusions in premature babies. This indicates an increased level of oxidative damage somewhere in the body. The aim of this study was to determine whether the lung may be a site of increased oxidative damage following blood transfusions. This was achieved by examining the relationship between blood transfusion and levels of MDA in bronchoalveolar lavage (BAL) fluid from ventilated premature babies. The study was a retrospective analysis of data obtained from a group of 42 ventilated premature babies of less than 32 weeks' gestation. Twenty‐seven babies received blood transfusions, and 9 received at least one transfusion during the first week of life when daily BAL samples were being taken. Pulmonary epithelial lining fluid (ELF) was sampled by BAL daily during the first week of life and weekly thereafter. MDA was measured by an established high performance liquid chromatography (HPLC) technique. There was a significant positive correlation between volume of blood transfusions received and peak and mean ELF MDA levels (r = 0.810, peak; r = 0.740, mean; n = 21). During the first week of life, when daily samples were being taken, the mean ELF MDA level after blood transfusion (1.829 μM; SE, 0.529) was significantly greater than before transfusion (0.928 μM; SE, 0.297) (n = 9). In babies who received 2 transfusions within the first week (n = 5), the MDA level was elevated further following the second transfusion (2.825 μM; SE, 0.346). The results of this study indicate that pulmonary oxidative damage increases after the receipt of blood transfusions. Babies receiving blood transfusions show a greater incidence of pulmonary oxidative stress and poor clinical outcome. This may simply reflect that the sickest babies are those most in need of blood transfusion, and that there is no causal relationship. However, the possibility of a causal relationship between blood transfusions and oxidative damage exists and should be investigated. Pediatr Pulmonol. 2005; 39:257–261. © 2005 Wiley‐Liss, Inc.
Candidate nsSNPs that can affect the functions and interactions of cell cycle proteins
Authors: Savas Sevtap , Ahmad M. Farhan , Shariff Mehjabeen , Kim David Y. , Ozcelik Hilmi 
Published: January 2005

AbstractNonsynonymous single nucleotide polymorphisms (nsSNPs) alter the encoded amino acid sequence, and are thus likely to affect the function of the proteins, and represent potential disease‐modifiers. There is an enormous number of nsSNPs in the human population, and the major challenge lies in distinguishing the functionally significant and potentially disease‐related ones from the rest. In this study, we analyzed the genetic variations that can alter the functions and the interactions of a group of cell cycle proteins (n = 60) and the proteins interacting with them (n = 26) using computational tools. As a result, we extracted 249 nsSNPs from 77 cell cycle proteins and their interaction partners from public SNP databases. Only 31 (12.4%) of the nsSNPs were validated. The majority (64.5%) of the validated SNPs were rare (minor allele frequencies < 5%). Evolutionary conservation analysis using the SIFT tool suggested that 16.1% of the validated nsSNPs may disrupt the protein function. In addition, 58% of the validated nsSNPs were located in functional protein domains/motifs, which together with the evolutionary conservation analysis enabled us to infer possible biological consequences of the nsSNPs in our set. Our study strongly suggests the presence of naturally occurring genetic variations in the cell cycle proteins that may affect their interactions and functions with possible roles in complex human diseases, such as cancer. Proteins 2005. © 2004 Wiley‐Liss, Inc.
Evolution of a microbial acetyltransferase for modification of glyphosate: a novel tolerance strategy
Authors: Siehl Daniel L , Castle Linda A , Gorton Rebecca , Chen Yong Hong , Bertain Sean , Cho Hyeon‐Je , Keenan Robert , Liu Donglong , Lassner Michael W 
Published: January 2005

AbstractN‐Acetylation is a modification of glyphosate that could potentially be used in transgenic crops, given a suitable acetyltransferase. Weak enzymatic activity (kcat = 5 min−1, KM = 1 mM) for N‐acetylation of glyphosate was discovered in several strains of Bacillus licheniformis (Weigmann) Chester by screening a microbial collection with a mass spectrometric assay. The parental enzyme conferred no tolerance to glyphosate in any host when expressed as a transgene. Eleven iterations of DNA shuffling resulted in a 7000‐fold improvement in catalytic efficiency (kcat/KM), sufficient for conferring robust tolerance to field rates of glyphosate in transgenic tobacco and maize. In terms of kcat/KM, the native enzyme exhibited weak activity (4–450% of that with glyphosate) with seven of the common amino acids. Evolution of the enzyme towards an improved kcat/KM for glyphosate resulted in increased activity toward aspartate (40‐fold improved kcat), but activity with serine and phosphoserine almost completely vanished. No activity was observed among a broad sampling of nucleotides and antibiotics. Improved catalysis with glyphosate coincided with increased thermal stability. Copyright © 2005 Society of Chemical Industry
Why are there not more herbicide‐tolerant crops?
Authors: Devine Malcolm D 
Published: January 2005

AbstractHerbicide‐tolerant (HT) varieties of corn, soybean, canola (oilseed rape) and cotton have been grown since the mid‐1990s, and have been widely adopted by farmers in several countries. HT genes have been inserted into or selected for in many other species, including almost all major crop species in the world and many minor crops and ornamental species. In some cases this has been done specifically to introduce the HT trait, whereas in others the HT gene has been used as a selectable marker (eg the bar gene, conferring glufosinate‐ammonium tolerance). However, in very few cases have the HT crops generated been commercialized, despite the weed‐control advantages that many such crops would offer. There are several reasons for this, including the high research and development costs associated with developing the new HT crop cultivars, the high cost of obtaining regulatory clearance for the HT crops or products derived from them, international trade issues relating to genetically modified crops, and issues surrounding the expanded herbicide registration for the new use and the potential impact of this on the existing registration status of the herbicide. New HT crops are unlikely to be developed unless they offer a sufficiently large advantage to farmers and a substantial assured market to justify the associated development and regulatory costs. Copyright © 2005 Society of Chemical Industry
Permeability‐frequency spectra of Nanoperm alloys at different temperatures
Authors: Qin W. , Xu F. , Wu Y. J. , Gao W. L. , Tang J. C. , Du Y. W. , Zhang Y. F. 
Published: January 2005

AbstractPermeability‐frequency spectra of Nanoperm alloys were studied by using an impedance analyzer in the temperature range from 80 K to 290 K. It is shown that with decreasing temperature, the initial permeability (μi) decreases and the relaxation frequency (f0) increases, and the temperature dependence of μif0 has a minimum at 140 K. These results indicate that the temperature fall reduces the domain thickness, strengthens the domain wall pinning and enhances the eddy‐current loss in high frequency ranges. Relative to domain thickness and resistivity, the effects of domain wall pinning strength on μi and f0 are dominant. Above 140 K, the effect of resistivity decrease on μif0 is more important, compared with domain thickness, whereas below 140 K, the case is just inverse. The temperature is an important factor affecting the dynamic magnetic properties of Nanoperm alloys. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Magnetic translation group for a finite system
Authors: Wal A. 
Published: January 2005

AbstractA magnetic translation group (MTG) for a finite system, with the Born‐Karman periodic boundary conditions, is introduced and its properties are described. We consider an itinerant electron, hopping to the nearest neighbours in a square lattice. Compatibility conditions for consistency of quantizations of the magnetic field with the periodic conditions impose severe restrictions for admissible distributions of quanta of magnetic flux. These restrictions are expressed in the structure of appropriate MTG, which defines the magnetic Brillouin zone. The energy band structure, analogous to the Landau levels for the free electron case, emerges from irreducible representations of MTG, their degeneracies and appropriate correlations with the crystal structure. An example of finite 4 × 4 crystal in quantized magnetic field is discussed. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Quasiparticle interference induced by a momentum‐dependent scattering in an s‐wave superconducting state
Authors: Pisarski P. , Harań G. 
Published: January 2005

AbstractFourier transformed maps of the local density of states in disordered superconducting Bi2Sr2CaCu2O8+δ provided important information on the quasiparticle states and their interference in high‐temperature superconductors. Neglecting the momentum‐dependence of the impurity potential it is possible to disentangle the quasiparticle interference effect from the static structure factor of the scatterers. The k‐dependence of the impurity potential makes such a distinction difficult. Here, for the model momentum‐dependent potential, we discuss the quasiparticle interference induced by an impurity in an s‐wave superconductor. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Linear extension of the Robinson–Schensted algorithm
Authors: Jakubczyk P. , Lulek B. 
Published: January 2005

AbstractThe Robinson–Schensted (RS) algorithm demonstrates a bijection between the set of magnetic configurations f and the set of pairs of tableaux: a semistandard Weyl tableau P(f) accompanied by a standard Young tableau Q(f). We show that it is not only a bijection between sets, but it can be extended to a linear unitary transformation within the space of all quantum states of the magnet. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Electronic band structure of the CeNi4Ga compound
Authors: Kowalczyk A. , Pugaczowa‐Michalska M. , Toliński T. 
Published: January 2005

AbstractNew results of the electronic properties of the CeNi4Ga compound are reported. The magnetic susceptibility, X‐ray photoemission spectroscopy and theoretical calculations suggest that this compound exhibits features typical of paramagnetic state and mixed‐valence behavior. The electronic structure of the ternary CeNi4Ga compound, crystallizing in the hexagonal CaCu5 structure is studied by ab‐initio calculations. Below the Fermi energy the total density of states contains mainly the d‐states of Ni atoms. The narrow peak of the f‐states of Ce atoms is found above the Fermi level. The density of states is N(EF) = 7.33 states/(eV f.u.) at the Fermi level. The electronic specific heat coefficient γ estimated from the band calculations is about 28.7 mJ/mol K2. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
‘π‐state’ induced by impurities with a repulsive interaction
Authors: Litak Grzegorz , Krawiec Mariusz 
Published: January 2005

AbstractWe study the properties of a quantum impurity embedded in a superconducting host. The superconductor is described by the negative U Hubbard model while the impurity introduces a repulsive interaction to the system. We discuss the influence of this ‘on‐impurity’ Coulomb repulsion on the local properties (density of states, electron pairing) of the superconductor. We show the condition of π‐like behaviour, defined as two subsystems having a phase difference of π, in the system by using a proper combination of attractive pairing interaction and repulsive one located at impurity site. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Vortex structure in the boson–fermion model
Authors: Mierzejewski Marcin , Śledź Żaneta 
Published: January 2005

AbstractIt has recently been observed in high‐temperature superconductors (HTSC) that the vortex charge strongly depends on doping. The sign of the charge is negative (positive) for overdoped (underdoped) compounds and its value is much larger than estimated from the BCS theory. We show that these results can be explained within the boson–fermion model. We demonstrate that the effective vortex charge is determined predominantly by concentration of the tightly bound electron pairs and sign of the vortex charge depends on the position of the bosonic level with respect to the Fermi energy. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Competition of d‐wave superconductivity and antiferromagnetism in the extended Hubbard model. Superfluid properties
Authors: Tobijaszewska B. , Micnas R. 
Published: January 2005

AbstractWe analyze a competition between d‐wave superconductivity (SC) and antiferromagnetism (AF) and show the influence of these phenomena on the superfluid stiffness. We deal with the extended Hubbard model on a 2D square lattice with the nn and nnn hopping (t–t′–U–W model) in the BCS‐Hartree–Fock approximation. Thermodynamic analysis shows that both, second or first order phase transition between the AF, SC and mixed AF + SC phases are possible. The homogeneous mixed phase or phase separation can be stabilized depending on interaction parameters, band structure and band filling. The corresponding temperature phase diagrams are determined. In the coexistence region we investigate the influence of the antiferromagnetism on the superfluid properties. In the mixed AF + SC ground state the superfluid density is reduced with growing antiferromagnetic ordering and vanishes at half–filling. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Electronic structure and photoemission studies of TbNi4B
Authors: Toliński T. , Pugaczowa‐Michalska M. , Chełkowska G. 
Published: January 2005

AbstractThe electronic structure of the TbNi4B compound has been studied by the X‐ray photoemission spectroscopy and ab‐initio calculations. The experimental valence band spectrum as well as the calculated density of states exhibit the domination of the Ni(3d) states close to the Fermi level. The Tb(4f) peaks are well localized. The peaks' positions are in a good agreement with the binding energies of the metallic terbium and nickel. Our calculations show that the TbNi4B compound is ferromagnetically ordered. The contributions of Tb and B to the densities of states at the Fermi level are very small. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Experimental evidence for magnetic resonance in the antiferro‐quadrupole phase
Authors: Demishev S. V. , Semeno A. V. , Paderno Yu. B. , Shitsevalova N. Yu. , Sluchanko N. E. 
Published: January 2005

AbstractFor strongly correlated electronic systems in addition to magnetically ordered phases based on the interaction between magnetic dipoles magnetic ordering originating from the quadrupolar magnetic interactions is possible. Up to now any information about magnetic resonances specific to quadrupolar ordering is missing. Here we report experimental evidence of the magnetic resonance in the antiferro‐quadrupole phase of CeB6. The temperature dependence of resonance parameters allows concluding about the essential role of the quadrupole ordering in the observed phenomenon. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
An inference method for temperature step‐stress accelerated life testing
Authors: Gouno Evans 
Published: January 2005

AbstractThis paper deals with step‐stress accelerated life testing. It presents a practical method to analyse temperature step‐stress accelerated life test data. The Arrhenius model is considered. Activation energy and failure rate under operational conditions are estimated both graphically and using maximum likelihood. Applications on simulated data and on real data are presented. Copyright © 2001 John Wiley & Sons, Ltd.
Determination of the Hubbard model parameters by using the unrestricted Hartree–Fock solutions, and improvement of their energies
Authors: Yamaki Daisuke , Yasuda Koji , Yamaguchi Kizashi 
Published: January 2005

AbstractA strategy is proposed to determine parameters in model Hamiltonians from the difference of the density matrices calculated by ab initio methods. As an example, the parameters of the two‐site Hubbard model are determined. The parameters t and U are explicitly expressed in terms of the energy difference and the difference of the expectation values of the spin operator 〈S2〉 between two unrestricted Hartree–Fock (UHF) solutions. By using this relation and the exact energy formulas of the model Hamiltonian the energies of the ground and excited states of the ab initio Hamiltonian are estimated. This energy estimation scheme is applied to H2 and Li2 molecules and the results are in reasonable agreement with those of the full configuration‐interaction method. The errors of our estimation are also discussed and evaluated by using a modified Hubbard model. © 2005 Wiley Periodicals, Inc. Int J Quantum Chem, 2005