bluuebunny/crossref_metadata_2025_split huggingface dataset:
GENERATORS FOR $\mathcal{H}$-INVARIANT PRIME IDEALS IN $O_{q}(\mathcal{M}_{m,p}(\mathbb{C}))$
Authors: Launois Stéphane 
Published: May 2004

AbstractIt is known that, for generic $q$, the $\mathcal{H}$-invariant prime ideals in $O_{q}(\mathcal{M}_{m,p}(\mathbb{C}))$ are generated by quantum minors (see S. Launois, Les idéaux premiers invariants de $O_{q}(\mathcal{M}_{m,p}(\mathbb{C}))$, J. Alg., in press). In this paper, $m$ and $p$ being given, we construct an algorithm which computes a generating set of quantum minors for each $\mathcal{H}$-invariant prime ideal in $O_{q}(\mathcal{M}_{m,p}(\mathbb{C}))$. We also describe, in the general case, an explicit generating set of quantum minors for some particular $\mathcal{H}$-invariant prime ideals in $O_{q}(\mathcal{M}_{m,p}(\mathbb{C}))$. In particular, if $(Y_{i,\alpha})_{(i,\alpha)\in[[1,m]]\times[[1,p]]}$ denotes the matrix of the canonical generators of $O_{q}(\mathcal{M}_{m,p}(\mathbb{C}))$, we prove that, if $u\geq3$, the ideal in $O_{q}(\mathcal{M}_{m,p}(\mathbb{C}))$ generated by $Y_{1,p}$ and the $u\times u$ quantum minors is prime. This result allows Lenagan and Rigal to show that the quantum determinantal factor rings of $O_{q}(\mathcal{M}_{m,p}(\mathbb{C}))$ are maximal orders (see T. H. Lenagan and L. Rigal, Proc. Edinb. Math. Soc.46 (2003), 513–529).AMS 2000 Mathematics subject classification: Primary 16P40. Secondary 16W35; 20G42
EXISTENCE OF POSITIVE SOLUTIONS FOR BOUNDARY-VALUE PROBLEMS WITH SINGULARITIES IN PHASE VARIABLES
Authors: Agarwal Ravi P. , O’Regan Donal , Staněk Svatoslav 
Published: May 2004

AbstractThe singular boundary-value problem $(g(x'))'=\mu f(t,x,x')$, $x'(0)=0$, $x(T)=b>0$ is considered. Here $\mu$ is the parameter and $f(t,x,y)$, which satisfies local Carathéodory conditions on $[0,T]\times(\mathbb{R}\setminus\{b\})\times(\mathbb{R}\setminus\{0\})$, may be singular at the values $x=b$ and $y=0$ of the phase variables $x$ and $y$, respectively. Conditions guaranteeing the existence of a positive solution to the above problem for suitable positive values of $\mu$ are given. The proofs are based on regularization and sequential techniques and use the topological transversality theorem.AMS 2000 Mathematics subject classification: Primary 34B16; 34B18
PROPAGATION OF SMALLNESS FOR SOLUTIONS OF GENERALIZED CAUCHY–RIEMANN SYSTEMS
Authors: Malinnikova E. 
Published: May 2004

AbstractLet $u$ be a solution of a generalized Cauchy–Riemann system in $\mathbb{R}^n$. Suppose that $|u|\le1$ in the unit ball and $|u|\le\varepsilon$ on some closed set $E$. Classical results say that if $E$ is a set of positive Lebesgue measure, then $|u|\le C\varepsilon^\alpha$ on any compact subset of the unit ball. In the present work the same estimate is proved provided that $E$ is a subset of a hyperplane and the (capacitary) dimension of $E$ is greater than $n-2$. The proof gives control of constants $C$ and $\alpha$.AMS 2000 Mathematics subject classification: Primary 31B35. Secondary 35B35; 35J45
SYSTEMS OF INTEGRAL EQUATIONS WITH WEIGHTED DIFFERENCE KERNELS
Authors: Porter D. , Biggs N. R. T. 
Published: May 2004

AbstractExplicit expressions are derived for the inverses of operators of a particular class that includes the operator corresponding to a system of coupled integral equations having weighted difference kernels. The inverses are expressed in terms of a finite number of functions and a systematic way of generating different sets of these functions is devised. The theory generalizes those previously derived for a single integral equation and an integral-equation system with pure difference kernels. The connection is made between the finite generation of inverses and embedding.AMS 2000 Mathematics subject classification: Primary 45A05
ON SUBFIELDS OF A FIELD GENERATED BY TWO CONJUGATE ALGEBRAIC NUMBERS
Authors: Drungilas Paulius , Dubickas Artūras 
Published: May 2004

AbstractLet $k$ be a field, and let $\alpha$ and $\alpha'$ be two algebraic numbers conjugate over $k$. We prove a result which implies that if $L\subset k(\alpha,\alpha')$ is an abelian or Hamiltonian extension of $k$, then $[L:k]\leq[k(\alpha):k]$. This is related to a certain question concerning the degree of an algebraic number and the degree of a quotient of its two conjugates provided that the quotient is a root of unity, which was raised (and answered) earlier by Cantor. Moreover, we introduce a new notion of the non-torsion power of an algebraic number and prove that a monic polynomial in $X$—irreducible over a real field and having $m$ roots of equal modulus, at least one of which is real—is a polynomial in $X^m$.AMS 2000 Mathematics subject classification: Primary 11R04; 11R20; 11R32; 12F10
A POLYNOMIAL MODEL FOR THE DOUBLE-LOOP SPACE OF AN EVEN SPHERE
Authors: Kamiyama Yasuhiko 
Published: May 2004

AbstractIt is well known that $\varOmega^2S^{2n+1}$ is approximated by $\textrm{Rat}_{k}(\mathbb{C}P^{n})$, the space of based holomorphic maps of degree $k$ from $S^2$ to $\mathbb{C}P^{n}$. In this paper we construct a space $G_{k}^{n}$ which is an analogue of $\textrm{Rat}_{k}(\mathbb{C}P^{n})$, and prove that under the natural map $j_k:G_{k}^{n}\to\varOmega^2S^{2n}$, $G_{k}^{n}$ approximates $\varOmega^2S^{2n}$.AMS 2000 Mathematics subject classification: Primary 55P35
SHARP HEAT-KERNEL ESTIMATES FOR HIGHER-ORDER OPERATORS WITH SINGULAR COEFFICIENTS
Authors: Barbatis Gerassimos 
Published: May 2004

AbstractWe obtain heat-kernel estimates for higher-order operators with measurable coefficients that can be singular or degenerate. Precise constants are given, which are sharp for small times.AMS 2000 Mathematics subject classification: Primary 35K30; 47D06. Secondary 35K25; 35K35
Book Reviews
Authors: Ridout M. S. 
Published: May 2004

STEIN, A. and PENNING DE VRIES, F. W. T. (editors).Data and Models in Action: Methodological Issues in Production Ecology.RAO, C. R. and SZEKELY, G. J. (editors).Statistics for the 21st Century: Methodologies for Applications of the Future.BARTHOLOMEW, D. J. and. KNOTT, M.Latent Variable Models and Factor Analysis, 2nd edition.KRZANOWSKI, W. J.An Introduction to Statistical Modelling.JOLICOEUR,P. Introduction to Biometry.DONNELLY, C. A. and FERGUSON, N. M.Statistical Aspects of BSE and vCJD: Models for Epidemics.YOUNG, L. J. and YOUNG, J. H.Statistical Ecology: A Population Perspective.LEONARD, T.A Course in Categorical Data Analysis.STIGLER, S. M.Statistics on the Table: The History of Statistical Concepts and Methods.EVANS, M. and SWARTZ, T.Approximating Integrals via Monte Carlo and Deterministic Methods.DUNN, G.Statistics in Psychiatry.MIGON, H. S. and GAMERMAN,D. Statistical Inference: An Integrated Approach.WU, C. F. J. and HAMADA, M.Experiments: Planning, Analysis and Parameter Design Optimisation.WEBER, D. C. and SKILLINGS, J. H.A First Course in the Design of Experiments: A Linear Models Approach.DE MUTH, J. E.Basic Statistics and Pharmaceutical Applications.CHOW, S.‐C. (editor)Encyclopedia of Biopharmaceutical Statistics.PETRIE, A. and WATSON,P. Statistics for Veterinary and Animal Science.BOSSOMAIER, T. R. J. and GREEN, D. G.Complex Systems.Brief reports by the editorGRASSMAN, W. K. (editor)Computational Probability.GLAZ, J. and BALAKRISHNAN, N. (editors).Scan Statistics.HEALEY, M. J. R.Matrices for Statistics, 2nd edition.
Book Reviews
Authors: Ridout M. S. 
Published: May 2004

McCONWAY, K. J., JONES, M. C., and TAYLOR, P. C. Statistical Modelling using Genstat.SCHINAZI, R. B. Classical and Spatial Point Processes.PERRY, J. E., SMITH, R. H., WOIWOD, I. P., and MORSE, D. R. (editors). Chaos in Real Data: The Analysis of Non‐linear Dynamics from Short Ecological Time Series.BURTON, R. F. Physiology by Numbers, 2nd edition.BERLINER, L. M., NYCHKA, D., and HOAR, T. (editors). Studies in the Atmospheric Sciences.PRAKASA RAO, B. L. S. Statistical Inference for Diffusion Type Processes.DONNER, A. and KLAR, N. Design and Analysis of Cluster Randomization Trials in Health Research.MATIS, J. H. and KIFFE, T. R. Stochastic Population Models: A Compartmental Perspective.LINDSEY, J. K. Models for Repeated Measurements, 2nd edition.FORD, E. D. Scientific Method for Ecological Research.BURNHAM, K. P. and ANDERSON, D. R. Model Selection and Inference: A Practical Information‐Theoretic Approach.COX, D. R. and REID, N. The Theory of the Design of Experiments.PINHEIRO, J. C. and BATES, D. M. Mixed‐effects models in S and S‐PLUS.VENABLES, W. N. and RIPLEY, B. D. S Programming.KRAUSE, A. and OLSON, M. The Basics of S and S‐PLUS.CHEN, M.‐H., SHAO, Q.‐M., and IBRAHIM, J. G. Monte Carlo Methods in Bayesian Computation.SAHAI, H. and AGEEL, M. L. The Analysis of Variance: Fixed, Random, and Mixed Models.EVERITT, B. S. and DUNN, G. Statistical Analysis of Medical Data: New Developments.MUKHOPADHYAY, N. Probability and Statistical Inference.KNIGHT, K. Mathematical Statistics.Brief reports by the editor MILLER, R. E. Optimization: Foundations and Applications.BLAND, M. An Introduction to Medical Statistics, 3rd edition.RABE‐HESKETH, S. and EVERITT, B. A Handbook of Statistical Analyses using Stata, 2nd edition.KOO, J. O. (editor). American Series in Mathematical and Management Sciences Volume 42. Modern Mathematical, Management, and Statistical Sciences, The Index to the 20th Century, Prologue to the 21st Century.MISHRA, S. N. and SHARMA, B. D. (editors). American Series in Mathematical and Management Sciences Volume 43. FIM‐I, Forum for Interdisciplinary Mathematics Proceedings on Statistical Inference, Combinatorics and Related Areas, Volume I of Proceedings of Banaras Hindu University (BHU) Conference (Varanasi, India, December 1997).VENABLES, W. N. and RIPLEY, B. D. Modern Applied Statistics with S‐PLUS, 3rd edition.
The mitochondrial genomes of soft ticks have an arrangement of genes that has remained unchanged for over 400 million years
Authors: Shao R. , Aoki Y. , Mitani H. , Tabuchi N. , Barker S. C. , Fukunaga M. 
Published: May 2004

AbstractThere are two major groups of ticks: soft ticks and hard ticks. The hard ticks comprise the prostriate ticks and the metastriate ticks. The mitochondrial (mt) genomes of one species of prostriate tick and two species of metastriate ticks had been sequenced prior to our study. The prostriate tick has the ancestral arrangement of mt genes of arthropods, whereas the two metastriate ticks have rearrangements of eight genes and duplicate control regions. However, the arrangement of genes in the mt genomes of soft ticks had not been studied. We sequenced the mt genomes of two species of soft ticks, Carios capensis and Ornithodoros moubata, and a metastriate tick, Haemaphysalis flava. We found that the soft ticks have the ancestral arrangement of mt genes of arthropods, whereas the metastriate tick, H. flava, shares the rearrangements of mt genes and duplicate control regions with the other two metastriate ticks that have previously been studied. Our study indicates that gene rearrangements and duplicate control regions in mt genomes occurred once in the most recent common ancestor of metastriate ticks, whereas the ancestral arrangement of arthropods has remained unchanged for over 400 million years in the lineages leading to the soft ticks and the prostriate ticks.
Identification of two cDNAs encoding synaptic vesicle protein 2 (SV2)‐like proteins from epithelial tissues in the cat flea, Ctenocephalides felis
Authors: Walmsley S. J. , Gaines P. J. 
Published: May 2004

AbstractTwo distinct cDNAs that appear to encode proteins in the synaptic vesicle‐2 (SV2) family were identified as expressed sequence tags from a Ctenocephalides felis hindgut and Malpighian tubule (HMT) cDNA library. To date, SV2 proteins have been described only in vertebrates, and have been detected only in synaptic vesicles in neuronal and endocrine tissues, where they are thought to regulate synaptic vesicle exocytosis. The cDNAs for the C. felis SV2‐like proteins SVLP‐1 and SVLP‐2 encode predicted full‐length proteins of 530 and 726 amino acids, respectively. Of characterized proteins, the SVLP protein sequences were most similar to rat SV2B. Northern blot analysis revealed that both mRNAs were up‐regulated in larval stages that feed and in adults after feeding, and were expressed primarily or exclusively in the HMT tissues in adult fleas. These results suggest that the flea SVLP‐1 and SVLP‐2 gene products may have roles that are specific for the HMT tissues, and may differ in function from vertebrate SV2 proteins.
The mosquito ribonucleotide reductase R2 gene: ultraviolet light induces expression of a novel R2 variant with an internal amino acid deletion
Authors: Jayachandran G. , Fallon A. M. 
Published: May 2004

AbstractUsing RT‐PCR, we examined expression of the ribonucleotide reductase R2 subunit (RNR‐R2) in Aedes albopictus mosquito cells after treatment with ultraviolet light (UV). In control cells, a predominant band at 1.2 kb corresponded to the full‐length cDNA. A smaller 650 bp band was unique to UV‐treated cells. Sequence analysis showed that the 650 bp band encoded a protein with an internal deletion of 179 amino acids, relative to Ae. albopictus RNR‐R2. The N‐terminal twenty amino acids were identical between AalRNR‐R2 and AalΔR2; downstream of the deletion, the proteins differed at only four residues. In AalΔR2, the internal deletion spanned five residues critical to RNR‐R2 enzymatic activity, including a key tyrosine residue that generates an essential free radical. The full‐length 46 kDa and truncated 25 kDa RNR‐R2 proteins were shown to be expressed on Western blots, and to differ in their subcellular localization. Similarly, expression of the two proteins was differentially regulated during the cell cycle, and expression of AalΔR2 predominated after UV treatment. AalΔR2 resembled a human RNR‐R2 variant called p53R2, which was induced by agents that damage DNA. As was the case with p53R2 and its antisense RNA, levels of AalΔR2 were diminished after treatment of mosquito cells with RNAi corresponding to p53 from Drosophila melanogaster. Examination of the AalRNR‐R2 homologue in the Anopheles gambiae genome suggested that AalΔR2 resulted from precise splicing between Exons 1, 4 and 5, eliminating Exons 2 and 3. The likelihood that AalΔR2 is a non‐enzymatic, functional participant in DNA metabolism is suggested by enhancement of DNA repair in an in vitro system and by the presence of a similar gene (rnr4) in yeast.
Stage‐specific expression of two actin genes in the yellow fever mosquito, Aedes aegypti
Authors: Vyazunova I. , Lan Q. 
Published: May 2004

AbstractThe expression patterns of two muscle‐specific actin genes were studied in the yellow fever mosquito, Aedes aegypti. The coding sequence of AeAct‐2 exhibits between 82 and 85% similarity with coding sequences of the Drosophila melanogaster and predicted Anopheles gambiae actin genes. The transcription of the AeAct‐2 gene was differentially regulated during developmental stages with higher levels of expression in larvae and lower levels in pupae and adults. The AeAct‐2 gene is mainly expressed in the head and body wall tissues. Transcripts of the AeAct‐3 gene are not detectable in larvae until late 4th instar and the level increased in male pupae and early male adults. The main site of expression of the AeAct‐3 gene was the thoracic tissue. Thus, AeAct‐3 is the first reported male‐specific actin gene in mosquitoes.
Population structure of the malaria vector Anopheles funestus in Senegal based on microsatellite and cytogenetic data
Authors: Cohuet A. , Dia I. , Simard F. , Raymond M. , Fontenille D. 
Published: May 2004

AbstractThe study of chromosomal inversions distribution within natural Anopheles funestus populations from West Africa revealed high levels of genetic structuring. In Burkina Faso, this was interpreted as evidence for incipient speciation, and two chromosomal forms were described, namely ‘Folonzo’ and ‘Kiribina’. Assignation of field collected specimens to one chromosomal form depends upon application of an algorithm based on chromosomal inversions. We assessed relevance and applicability of this algorithm on An. funestus populations from Senegal, where both forms occur. Furthermore, we estimated the level of genetic differentiation between populations using microsatellite loci spread over the whole genome. Significant genetic differentiation was revealed between geographical populations of An. funestus, and the pattern observed suggested isolation by distance. Chromosomal heterogeneity was not detected by microsatellite markers. Thus, although incipient speciation could not be ruled out by our data, our results suggest that differential environmental selection pressure acting on inversions should be considered a major factor in shaping their distribution in wild An. funestus populations.
A novel lectin with a fibrinogen‐like domain and its potential involvement in the innate immune response of Armigeres subalbatus against bacteria
Authors: Wang X. , Rocheleau T. A. , Fuchs J. F. , Hillyer J. F. , Chen C.‐C. , Christensen B. M. 
Published: May 2004

AbstractMosquitoes have an efficient cellular innate immune response that includes phagocytosis of microbial pathogens and encapsulation of metozoan parasites. In this study, we describe a novel lectin in the mosquito, Armigeres subalbatus (aslectin or AL‐1). The 1.27 kb cDNA clone for the AL‐1 gene (AL‐1) encodes a 279 deduced amino acid sequence that contains a C‐terminal fibrinogen‐like domain. AL‐1 is transcribed in all life stages. AL‐1 mainly exists in the haemolymph of adult female mosquitoes, and is upregulated following both Escherichia coli and Micrococcus luteus challenge. AL‐1 specifically recognizes N‐acetyl‐d‐glucosamine and is able to bind both E. coli and M. luteus. These results suggest that AL‐1 might function as a pattern recognition receptor in the immune response in Ar. subalbatus.
Transcriptional regulation in cowpea bruchid guts during adaptation to a plant defence protease inhibitor
Authors: Moon J. , Salzman R. A. , Ahn J.‐E. , Koiwa H. , Zhu‐Salzman K. 
Published: May 2004

AbstractCowpea bruchid, when fed on a diet containing the soybean cysteine protease inhibitor soyacystatin N (scN), activates an array of counter‐defence genes to adapt to the negative effects of the inhibitor and regain its normal rate of feeding and development. A collection of 1920 cDNAs was obtained by differential subtraction with cDNAs prepared from guts of the 4th instar larvae of scN‐adapted (reared on scN‐containing diet) and scN‐unadapted (reared on regular scN‐free diet) cowpea bruchids. Subsequent expression profiling using DNA microarray and Northern blot analyses identified ninety‐four transcript species from this collection that are responsive to dietary scN. scN‐adapted insects induced genes encoding protein and carbohydrate digestive enzymes, probably to help meet their carbon and nitrogen requirements. Up‐regulation of antimicrobial and detoxification protein genes may represent a generalized defence response. Genes down‐regulated by scN reflected physiological adjustments of the cowpea bruchids to scN challenge. A large portion of the responsive genes, presumably involved in carrying out the counter‐defence response, were of unknown function. The full‐length cDNA of an scN‐inducible cathepsin B‐like cysteine protease was obtained. Its transcriptional response to scN during larval development contrasts with the pattern of the cathepsin L family, the major digestive enzymes. These results suggest cathepsin B‐like cysteine proteases may play a crucial role in cowpea bruchid adaptation to dietary scN.
Genetic structuring of boll weevil populations in the US based on RAPD markers
Authors: Kim K. S. , Sappington T. W. 
Published: May 2004

AbstractRandomly amplified polymorphic DNA (RAPD) analysis was performed to infer the magnitude and pattern of genetic differentiation among boll weevil populations from eighteen locations across eight US states and north‐east Mexico. Sixty‐seven reproducible bands from six random primers were analysed for genetic variation within and between weevil populations. Genetic and geographical distances among all populations were positively correlated, reflecting a pattern of isolation by distance within a larger metapopulation. Gene flow between south‐central, western and eastern regions is limited, but migration between locations within regions appears to be relatively frequent up to distances of ∼300–400 km. However, estimates of effective migration were much lower than those estimated from mtDNA‐RFLP data reported previously.
The moleskin gene product is essential for Caudal‐mediated constitutive antifungal Drosomycin gene expression in Drosophila epithelia
Authors: Han S.‐H. , Ryu J.‐H. , Oh C.‐T. , Nam K.‐B. , Nam H.‐J. , Jang I.‐H. , Brey P. T. , Lee W.‐J. 
Published: May 2004

AbstractThe homeobox gene, Caudal, encodes the DNA‐binding nuclear transcription factor that plays a crucial role during development and innate immune response. The Drosophila homologue of importin‐7 (DIM‐7), encoded by moleskin, was identified as a Caudal‐interacting molecule during yeast two‐hybrid screening. Both mutation of the minimal region of Caudal responsible for moleskin binding and RNA interference (RNAi) of moleskin dramatically inhibited the Caudal nuclear localization. Furthermore, Caudal‐mediated constitutive expression of antifungal Drosomycin gene was severely affected in the moleskin‐RNAi flies, showing a local Drosomycin expression pattern indistinguishable from that of the Caudal‐RNAi flies. These in vivo data suggest that DIM‐7 mediates Caudal nuclear localization, which is important for the proper Caudal function necessary for regulating innate immune genes in Drosophila.
Cloning, expression and partial characterization of a Haemaphysalis longicornis and a Rhipicephalus appendiculatus glutathione S‐transferase
Authors: Da Silva Vaz Jnr I. , Imamura S. , Ohashi K. , Onuma M. 
Published: May 2004

AbstractThe ticks Haemaphysalis longicornis and Rhipicephalus appendiculatus are important parasites worldwide. The current method for control of cattle ticks involves the use of chemicals. Nevertheless, parasite resistance is an ever increasing global problem. Glutathione S‐transferases (GSTs) play a central role in detoxication of xenobiotic and endogenous compounds. Several authors have noted that an increase in GST activity is associated with resistance to insecticides and acaricides. In the present study, we report the cloning and expression of GST cDNAs from H. longicornis and R. appendiculatus. In addition, we determine the effect of three acaricides (ethion, deltamethrin and diazinon) on the enzymatic activity of rGSTs.