cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effect of node mobility on AOMDV protocol in MANET
Creators: name: Das, Indrani
name: Lobiyal, D. K
name: Katti, C. P
Publisher: name: arXiv
Year: 2014
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: In this paper, we have analyzed the effect of node mobility on the performance of AOMDV multipath routing protocol. This routing protocol in ad hoc network has been analyzed with random way point mobility model only. This is not sufficient to evaluate the behavior of a routing protocol. Therefore, in this paper, we have considered Random waypoint, Random Direction and Probabilistic Random Walk mobility Model for performance analysis of AOMDV protocol. The result reveals that packet delivery ratio decreases with the increasing node mobility for all mobility models. Also, average end-to-end delay is also vary with varying node speed, initially upto 20 nodes in all mobility models delay is minimum.
description: 9 pages, 6 figures, International Journal of Wireless & Mobile Networks (IJWMN) Vol. 6, No. 3, June 2014
Spectral resolutions in effect algebras
Creators: name: Jenčová, Anna
name: Pulmannová, Sylvia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Rings and Algebras (math.RA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Effect algebras were introduced as an abstract algebraic model for Hilbert space effects representing quantum mechanical measurements. We study additional structures on an effect algebra $E$ that enable us to define spectrality and spectral resolutions for elements of $E$ akin to those of self-adjoint operators. These structures, called compression bases, are special families of maps on $E$, analogous to the set of compressions on operator algebras, order unit spaces or unital abelian groups. Elements of a compression base are in one-to-one correspondence with certain elements of $E$, called projections. An effect algebra is called spectral if it has a distinguished compression base with two special properties: the projection cover property (i.e., for every element $a$ in $E$ there is a smallest projection majorizing $a$), and the so-called b-comparability property, which is an analogue of general comparability in operator algebras or unital abelian groups. It is shown that in a spectral archimedean effect algebra $E$, every $a\in E$ admits a unique rational spectral resolution and its properties are studied. If in addition $E$ possesses a separating set of states, then every element $a\in E$ is determined by its spectral resolution. It is also proved that for some types of interval effect algebras (with RDP, archimedean divisible), spectrality of $E$ is equivalent to spectrality of its universal group and the corresponding rational spectral resolutions are the same. In particular, for convex archimedean effect algebras, spectral resolutions in $E$ are in agreement with spectral resolutions in the corresponding order unit space.
description: 31 pages, accepted in Quantum, comments welcome
Suppression of a signal sequence mutation by an amino acid substitution in the mature portion of the maltose-binding protein.
Creators: name: Ryan, J P
name: Randall, L L
name: Walsh, K A
name: Bassford, P J
name: Bollinger, J
name: Cover, W H
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1987

description: An unusual spontaneous pseudorevertant of an Escherichia coli strain carrying the signal sequence point mutation malE14-1 was characterized. The suppressor mutation, malE2261, resulted in a single substitution of an aspartyl residue for a tyrosyl residue at position 283 in the sequence of the mature maltose-binding protein. The precursor retained the malE14-1 point mutation in the signal sequence. The pseudorevertant carrying both malE14-1 and malE2261 exported twice the amount of maltose-binding protein as that of the mutant carrying the malE14-1 allele alone but only 18% of the amount exported by a strain producing wild-type maltose-binding protein. A strain carrying the suppressor allele malE2261 in combination with a wild-type signal sequence exported normal quantities of maltose-binding protein to the periplasm. Mature MalE2261 had a Kd for maltose of 27 microM, compared with 3.6 microM for mature wild-type maltose-binding protein. The precursor species than contained both changes resulting from malE14-1 and malE2261 was significantly less stable in the cytoplasm than was the precursor containing only the change encoded by malE14-1.
Mapping of Agrobacterium tumefaciens chromosomal genes affecting cellulose synthesis and bacterial attachment to host cells.
Creators: name: Holliday, T
name: Robertson, J L
name: Matthysse, A G
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1988

description: Six chromosomal transposon mutations in Agrobacterium tumefaciens which result in an inability to synthesize cellulose fibrils were mapped to the vicinity of trp-2 and met-6. Mutations which result in an inability to attach to plant cells, attC43 and attC69, also mapped in this region, as did one Tn5 mutation which caused overproduction of cellulose. Another cellulose overproduction mutation mapped at a distance and was closely linked to ilv-13. The results suggest that there is a region of the A. tumefaciens chromosome located near met-6 which is concerned with the interaction of the bacterium with the host cell surface.
Semi-Supervised Segmentation of Multi-vendor and Multi-center Cardiac MRI using Histogram Matching
Creators: name: Bolhassani, Mahyar
name: Oksuz, Ilkay
Publisher: name: arXiv
Year: 2023
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Automatic segmentation of the heart cavity is an essential task for the diagnosis of cardiac diseases. In this paper, we propose a semi-supervised segmentation setup for leveraging unlabeled data to segment Left-ventricle, Right-ventricle, and Myocardium. We utilize an enhanced version of residual U-Net architecture on a large-scale cardiac MRI dataset. Handling the class imbalanced data issue using dice loss, the enhanced supervised model is able to achieve better dice scores in comparison with a vanilla U-Net model. We applied several augmentation techniques including histogram matching to increase the performance of our model in other domains. Also, we introduce a simple but efficient semi-supervised segmentation method to improve segmentation results without the need for large labeled data. Finally, we applied our method on two benchmark datasets, STACOM2018, and M\&Ms 2020 challenges, to show the potency of the proposed model. The effectiveness of our proposed model is demonstrated by the quantitative results. The model achieves average dice scores of 0.921, 0.926, and 0.891 for Left-ventricle, Right-ventricle, and Myocardium respectively.
description: 5 pages, 8 figures, IEEE conference published paper
The masking condition for quantum state in two-dimensional Hilbert space
Creators: name: Wang, Mei-Yi
name: Zhang, Su-Juan
name: Bai, Chen-Ming
name: Liu, Lu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This paper focuses on quantum information masking for quantum state in two-dimensional Hilbert space. We present a system of equations as the condition of quantum information masking. It is shown that quantum information contained in a single qubit state can be masked, if and only if the coefficients of quantum state satisfy the given system of equations. By observing the characteristics of non-orthogonal maskable quantum states, we obtain a related conclusion, namely, if two non-orthogonal two-qubit quantum states can mask a single qubit state, they have the same number of terms and the same basis. Finally, for maskable orthogonal quantum states, we analyze two special examples and give their images for an intuitive description.
Active transport of maltose in membrane vesicles obtained from Escherichia coli cells producing tethered maltose-binding protein.
Creators: name: Dean, D A
name: Nikaido, H
name: Bassford, P J
name: Fikes, J D
name: Gehring, K
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1989

description: Attempts to reconstitute periplasmic binding protein-dependent transport activity in membrane vesicles have often resulted in systems with poor and rather inconsistent activity, possibly because of the need to add a large excess of purified binding protein to the vesicles. We circumvented this difficulty by using a mutant which produces a precursor maltose-binding protein that is translocated across the cytoplasmic membrane but is not cleaved by the signal peptidase (J. D. Fikes and P. J. Bassford, Jr., J. Bacteriol. 169:2352-2359, 1987). The protein remains tethered to the cytoplasmic membrane, presumably through the hydrophobic signal sequence, and we show here that the spheroplasts and membrane vesicles prepared from this mutant catalyze active maltose transport without the addition of purified maltose-binding protein. In vesicles, the transport requires electron donors, such as ascorbate and phenazine methosulfate or D-lactate. However, inhibition by dicyclohexylcarbodiimide and stimulation of transport by the inculsion of ADP or ATP in the intravesicular space suggest that ATP (or compounds derived from it) is involved in the energization of the transport. The transport activity of intact cells can be recovered without much inactivation in the vesicles, and their high activity and ease of preparation will be useful in studies of the mechanism of the binding protein-dependent transport process.
Quantum statistical calculation of cluster abundances in hot dense matter
Creators: name: Ropke, Gerd
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The cluster abundances are calculated from a quantum statistical approach taking into account in-medium corrections. For arbitrary cluster size the self-energy and Pauli blocking shifts are considered. Exploratory calculations are performed for symmetric matter at temperature $T=5$ MeV and baryon density $\varrho=0.0156$ fm$^{-3}$ to be compared with the solar element distribution. It is shown that the abundances of weakly bound nuclei with mass number $4
description: 6 pages, 1 figure
Associative algebras and intertwining operators
Creators: name: Huang, Yi-Zhi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Rings and Algebras (math.RA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 17B69, 81T40

description: Let $V$ be a vertex operator algebra and $A^{\infty}(V)$ and $A^{N}(V)$ for $N\in \mathbb{N}$ the associative algebras introduced by the author in [H5]. For a lower-bounded generalized $V$-module $W$, we give $W$ a structure of graded $A^{\infty}(V)$-module and we introduce an $A^{\infty}(V)$-bimodule $A^{\infty}(W)$ and an $A^{N}(V)$-bimodule $A^{N}(W)$. We prove that the space of (logarithmic) intertwining operators of type $\binom{W_{3}}{W_{1}W_{2}}$ for lower-bounded generalized $V$-modules $W_{1}$, $W_{2}$ and $W_{3}$ is isomorphic to the space $\hom_{A^{\infty}(V)}(A^{\infty}(W_{1})\otimes_{A^{\infty}(V)}W_{2}, W_{3})$. Assuming that $W_{2}$ and $W_{3}'$ are equivalent to certain universal lower-bounded generalized $V$-modules generated by their $A^{N}(V)$-submodules consisting of elements of levels less than or equal to $N\in \mathbb{N}$, we also prove that the space of (logarithmic) intertwining operators of type $\binom{W_{3}}{W_{1}W_{2}}$ is isomorphic to the space of $\hom_{A^{N}(V)}(A^{N}(W_{1})\otimes_{A^{N}(V)}Ω_{N}^{0}(W_{2}), Ω_{N}^{0}(W_{3}))$.
description: 45 pages. One section reviewing the associative algebras $A^{\infty}(V)$ and $A^{N}(V)$ and graded $A^{\infty}(V)$- and $A^{N}(V)$-modules is added. Some misprints and typos are corrected. To appear in Comm. Math. Phys
Analysis of mutational alterations in the hydrophilic segment of the maltose-binding protein signal peptide.
Creators: name: Puziss, J W
name: Bassford, P J
name: Fikes, J D
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1989

description: Oligonucleotide-directed mutagenesis was employed to investigate the role of the hydrophilic segment of the Escherichia coli maltose-binding protein (MBP) signal peptide in the protein export process. The three basic residues residing at the amino terminus of the signal peptide were systematically substituted with neutral or acidic residues, decreasing the net charge in a stepwise fashion from +3 to -3. It was found that a net positive charge was not absolutely required for MBP export to the periplasm. However, export was most rapid and efficient when the signal peptide retained at least a single basic residue and a net charge of +1. The nature of the adjacent hydrophobic core helped to determine the effect of charge changes in the hydrophilic segment on MBP export, which suggested that these two regions of the signal peptide do not have totally distinct functions. Although the stepwise decrease in net charge of the signal peptide also resulted in a progressive decrease in the level of MBP synthesis, the data do not readily support a model in which MBP synthesis and export are obligately coupled events. The export defect resulting from alterations in the hydrophilic segment was partially suppressed in strains harboring certain prl alleles but not in strains harboring prlA alleles that are highly efficient suppressors of signal sequence mutations that alter the hydrophobic core.
Cloned Bacillus subtilis chromosomal DNA mediates tetracycline resistance when present in multiple copies.
Creators: name: Ives, C L
name: Bott, K F
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1989

description: Plasmid pCIS7, containing 11.5 kilobases (kb) of Bacillus subtilis DNA, was isolated from a Tn917 transposon insertion in tetracycline-sensitive B. subtilis KS162. When integrated into the chromosome of B. subtilis 168, this plasmid conferred tetracycline resistance upon reiteration of the plasmid DNA sequences in the chromosome. Deletions and subclones of pCIS7 were constructed and introduced into an Escherichia coli in vitro transcription-translation system. A 72-kilodalton protein was localized to a 3.1-kb PstI-EcoRI fragment of the plasmid. Amplification of the 3.1-kb PstI-EcoRI fragment was required for expression of tetracycline resistance in B. subtilis 168. By hybridization to previously characterized clones, the 11.5-kb fragment was localized to the origin region of the chromosome. Through contour-clamped homogeneous electric field electrophoresis, this cluster of clones was shown to reside on a 200-kb NotI fragment bridging SfiI fragments of 150 and 250 kb and was oriented with respect to the purA and guaA loci, developing an accurate physical map of the region surrounding the origin of replication.
Non-reciprocal interactions enhance heterogeneity
Creators: name: Carletti, Timoteo
name: Muolo, Riccardo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Mathematical Physics (math-ph)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: We study a process of pattern formation for a generic model of species anchored to the nodes of a network where local reactions take place, and that experience non-reciprocal long-range interactions, encoded by the network directed links. By assuming the system to exhibit a stable homogeneous equilibrium whenever only local interactions are considered, we prove that such equilibrium can turn unstable once suitable non-reciprocal long-range interactions are allowed for. Stated differently we propose sufficient conditions allowing for patterns to emerge using a non-symmetric coupling, while initial perturbations about the homogenous equilibrium fade away assuming reciprocal coupling. The instability, precursor of the emerging spatio-temporal patterns, can be traced back, via a linear stability analysis, to the complex spectrum of an interaction non-symmetric Laplace operator. Taken together, our results pave the way for the understanding of the many and heterogeneous patterns of complexity found in ecological, chemical or physical systems composed by interacting parts, once no diffusion takes place.
Retour d'exp{é}rience : Int{é}grer des applications transverses (Physique et Chimie) de l'enseignement de l'Alg{è}bre
Creators: name: Bosco, Mickael
name: Michel, Nicolas
Publisher: name: arXiv
Year: 2023
Subjects: subject: History and Overview (math.HO)
subject: FOS: Mathematics

description: As a Physicist and a Chemist , we have had the opportunity to teach Algebra in our engineering school in Aix-en-Provence. The article deals with the interactions made between Physics, Chemistry and Algebra.
description: in French
A new SATIRE-S spectral solar irradiance reconstruction for solar cycles 21--23 and its implications for stratospheric ozone
Creators: name: Ball, William T.
name: Krivova, Natalie A.
name: Unruh, Yvonne C.
name: Haigh, Joanna D.
name: Solanki, Sami K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a revised and extended total and spectral solar irradiance (SSI) reconstruction, which includes a wavelength-dependent uncertainty estimate, spanning the last three solar cycles using the SATIRE-S model. The SSI reconstruction covers wavelengths between 115 and 160,000 nm and all dates between August 1974 and October 2009. This represents the first full-wavelength SATIRE-S reconstruction to cover the last three solar cycles without data gaps and with an uncertainty estimate. SATIRE-S is compared with the NRLSSI model and SORCE/SOLSTICE ultraviolet (UV) observations. SATIRE-S displays similar cycle behaviour to NRLSSI for wavelengths below 242 nm and almost twice the variability between 242 and 310 nm. During the decline of last solar cycle, between 2003 and 2008, SSI from SORCE/SOLSTICE version 12 and 10 typically displays more than three times the variability of SATIRE-S between 200 and 300 nm. All three datasets are used to model changes in stratospheric ozone within a 2D atmospheric model for a decline from high solar activity to solar minimum. The different flux changes result in different modelled ozone trends. Using NRLSSI leads to a decline in mesospheric ozone, while SATIRE-S and SORCE/SOLSTICE result in an increase. Recent publications have highlighted increases in mesospheric ozone when considering version 10 SORCE/SOLSTICE irradiances. The recalibrated SORCE/SOLSTICE version 12 irradiances result in a much smaller mesospheric ozone response than when using version 10 and now similar in magnitude to SATIRE-S. This shows that current knowledge of variations in spectral irradiance is not sufficient to warrant robust conclusions concerning the impact of solar variability on the atmosphere and climate.
description: 25 pages (18 pages in main article with 6 figures; 7 pages in supplementary materials with 6 figures) in draft mode using the American Meteorological Society package. Submitted to Journal of Atmospheric Sciences for publication
Mutations that improve export of maltose-binding protein in SecB- cells of Escherichia coli.
Creators: name: Collier, D N
name: Bassford, P J
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1989

description: It previously has been proposed that the Escherichia coli SecB protein promotes the export of the maltose-binding protein (MBP) from the cytoplasm by preventing the folding of the precursor MBP (preMBP) into a translocation-incompetent conformation. The export of wild-type MBP is only partially blocked in SecB- cells. In contrast, the export of MBP16-1, an MBP species with a defective signal peptide, is totally dependent on SecB; hence, SecB- cells that synthesize MBP16-1 are unable to utilize maltose as a sole carbon source. The selection of Mal+ revertants primarily yielded mutants with alterations in the MBP16-1 signal peptide that permitted SecB-independent MBP export to the periplasm to various extents. Although each of these alterations increased the overall hydrophobicity of the signal peptide, it was not possible to strictly equate changes in hydrophobicity with the degree of SecB-independent export. Somewhat unexpectedly, two mutants were obtained in which MBP export in SecB- cells was markedly superior to that of the wild-type MBP. Although wild-type MBP is not cotranslationally translocated in SecB- cells, the two mutant proteins designated MBP172 and MBP173 exhibited significant cotranslational export in the absence of SecB. Thus, the role of SecB was partially supplanted by a signal peptide that promoted more rapid movement of MBP through the export pathway. When preMBP included the MBP172 signal peptide as well as an alteration in the mature moiety that slows folding, the SecB requirement for maximal MBP export efficiency was almost totally eliminated. These results provide additional strong support for the proposed antifolding role of SecB in MBP export.
Novel secA alleles improve export of maltose-binding protein synthesized with a defective signal peptide.
Creators: name: Bassford, P J
name: Fikes, J D
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1989

description: Mutations previously designated prlD were described that suppressed malE signal sequence mutations and were located in the vicinity of the secA gene on the Escherichia coli chromosome. In this study, we demonstrated that four such independently isolated prlD mutations represented three unique single-base substitutions in secA, resulting in alterations at residues 111, 373, and 488 of the 901-residue SecA protein. Heretofore, the only mutations that had been described for secA were located early in the gene and resulted in a general protein export defect. Insertion mutations in the cloned gene X-secA operon that reduced or eliminated suppression by a prlD mutation also have been obtained. The properties of these suppressor and insertion mutations provide some insight into the role of SecA in the protein export process.
Characterization of chromosomal DNA amplifications with associated tetracycline resistance in Bacillus subtilis.
Creators: name: Ives, C L
name: Bott, K F
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1990

description: Endogenous chromosomal DNA amplifications with associated tetracycline resistance (Tcr) in Bacillus subtilis were first described by C. R. Wilson and A. E. Morgan (J. Bacteriol. 163:445-453, 1985). We have confirmed and extended their results, and we show that fusion of protoplasts from Tcs B. subtilis 168 trpC2 with polyethylene glycol and regeneration on medium containing 20 micrograms of tetracycline per ml induces Tcr regenerants that contain amplified DNA. This phenomenon appeared to be recE dependent and requires the addition of polyethylene glycol. Along with three regenerants kindly provided by Wilson and Morgan (RAD1, RAD6, and RAD7), we characterized three strains (CLI20, CLI22, CLI30) isolated in this laboratory. All six contain an amplified region of DNA which was independently cloned on plasmid pCIS7. Integration of pCIS7 into the wild-type (Tcs) B. subtilis chromosome and amplification of the plasmid sequences generated a Tcr phenotype, even though the DNA on pCIS7 was cloned from Tcs B. subtilis KS162 (Ives and Bott, J. Bacteriol. 171:1801-1810, 1989). The amplified DNA also showed homology (through hybridization analysis) with pAM alpha 1 delta 1, a gram-positive Tcr plasmid, indicating that B. subtilis normally contains a silent integrated copy of the gene whose amplification confers Tcr. The amplifications were determined to lie between purA and gyrB on the B. subtilis chromosome, and the endpoints were mapped. RAD6 and CLI30 may share the same left-hand endpoint, but the other endpoints are different in each isolate. The amplified DNAs of RAD1, RAD6, CLI20, and CLI30 end near known DNA membrane binding sites. The number of amplified units of DNA was determined through dot blot analysis to do approximately 80 to 100 copies per cell, with corresponding increases in transcription of RAD1, RAD6, CLI20, CLI22, and CLI30.
Koszul algebras and Donaldson-Thomas invariants
Creators: name: Dotsenko, Vladimir
name: Feigin, Evgeny
name: Reineke, Markus
Publisher: name: arXiv
Year: 2021
Subjects: subject: Representation Theory (math.RT)
subject: Algebraic Geometry (math.AG)
subject: K-Theory and Homology (math.KT)
subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: For a given symmetric quiver $Q$, we define a supercommutative quadratic algebra $\mathcal{A}_Q$ whose Poincaré series is related to the motivic generating function of $Q$ by a simple change of variables. The Koszul duality between supercommutative algebras and Lie superalgebras assigns to the algebra $\mathcal{A}_Q$ its Koszul dual Lie superalgebra $\mathfrak{g}_Q$. We prove that the motivic Donaldson-Thomas invariants of the quiver $Q$ may be computed using the Poincaré series of a certain Lie subalgebra of $\mathfrak{g}_Q$ that can be described, using an action of the first Weyl algebra on $\mathfrak{g}_Q$, as the kernel of the operator $\partial_t$. This gives a new proof of positivity for motivic Donaldson--Thomas invariants. In addition, we prove that the algebra $\mathcal{A}_Q$ is numerically Koszul for every symmetric quiver $Q$ and conjecture that it is in fact Koszul; we also prove this conjecture for quivers of a certain class.
description: 25 pages, the main result on DT invariants of symmetric quivers is now not conditional on Koszulness
Complementation of an Escherichia coli proC mutation by a gene cloned from Treponema pallidum.
Creators: name: Stamm, L V
name: Bassford, P J
name: Gherardini, F C
name: Hobbs, M M
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1990

description: Little is known concerning the biosynthetic and metabolic capabilities of the syphilis agent, Treponema pallidum, because of the inability to cultivate continuously the organism in vitro. To circumvent the problem of cultivation, researchers have used recombinant DNA technology to express treponemal protein antigens in Escherichia coli. However, with a few notable exceptions, the specific cellular roles of these cloned treponemal proteins have not been determined. In this study, a cosmid library of T. pallidum genomic DNA was constructed and amplified by repackaging infective lambda bacteriophage particles in vivo. Recombinant clones capable of complementing a null mutation in the E. coli proC gene encoding 1-pyrroline-5-carboxylate (P5C) reductase (EC 1.5.1.2) were subsequently identified. The complementing activity was eventually localized to a 2.3-kilobase BglII-HindIII fragment that hybridized to the same-size fragment of a BglII-HindIII digest of T. pallidum DNA. Two proteins of 41 and 27 kilodaltons (kDa) were encoded by this fragment, as determined by maxicell analysis. Although only the 41-kDa protein could be specifically precipitated by experimental syphilitic rabbit antisera, it was the 27-kDa protein that was responsible for the proC-complementing activity. The recombinant P5C reductase differed from the native E. coli enzyme by a number of biochemical properties. The cloning of a T. pallidum gene encoding P5C reductase strongly suggests that this pathogen has the ability to synthesize proline and possibly other amino acids.
Central exclusive production at the Tevatron
Creators: name: Albrow, Michael G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The Collider Detector at Fermilab, CDF, observed for the first time in hadron-hadron collisions photon-photon to e+e- and mu+mu-, photon-pomeron to J/psi and psi(2S), and pomeron-pomeron to photon+photon and to chi_c. Exclusive pi+pi- production by double pomeron exchange was also measured at p+pbar CM energies 900 GeV and 1960 GeV, showing f0 and f2 resonance structures.
description: 12 pages, 6 figures, 1 table. To be published in Int. J. Mod. Phys. A
Deformable registration with intensity correction for CESM monitoring response to Neoadjuvant Chemotherapy
Creators: name: Jailin, Clément
name: De Carvalho, Pablo Milioni
name: Mohamed, Sara
name: Vancamberg, Laurence
name: Moustafa, Amr Farouk Ibrahim
name: Gomaa, Mohammed
name: Kamal, Rasha Mohammed
name: Muller, Serge
Publisher: name: arXiv
Year: 2023
Subjects: subject: Medical Physics (physics.med-ph)
subject: Signal Processing (eess.SP)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper proposes a robust longitudinal registration method for Contrast Enhanced Spectral Mammography in monitoring neoadjuvant chemotherapy. Because breast texture intensity changes with the treatment, a non-rigid registration procedure with local intensity compensations is developed. The approach allows registering the low energy images of the exams acquired before and after the chemotherapy. The measured motion is then applied to the corresponding recombined images. The difference of registered images, called residual, makes vanishing the breast texture that did not changed between the two exams. Consequently, this registered residual allows identifying local density and iodine changes, especially in the lesion area. The method is validated with a synthetic NAC case where ground truths are available. Then the procedure is applied to 51 patients with 208 CESM image pairs acquired before and after the chemotherapy treatment. The proposed registration converged in all 208 cases. The intensity-compensated registration approach is evaluated with different mathematical metrics and through the repositioning of clinical landmarks (RMSE: 5.9 mm) and outperforms state-of-the-art registration techniques.
A fractional Helly theorem for boxes
Creators: name: Bárány, I.
name: Fodor, F.
name: Martínez-Pérez, A.
name: Montejano, L.
name: Oliveros, D.
name: Pór, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Metric Geometry (math.MG)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 52A35

description: Let $\mathcal{F}$ be a family of $n$ axis-parallel boxes in $\mathbb{R}^d$ and $α\in (1-1/d,1]$ a real number. There exists a real number $β(α)>0$ such that if there are $α{n\choose 2}$ intersecting pairs in $\mathcal{F}$, then $\mathcal{F}$ contains an intersecting subfamily of size $βn$. A simple example shows that the above statement is best possible in the sense that if $α\leq 1-1/d$, then there may be no point in $\mathbb{R}^d$ that belongs to more than $d$ elements of $\mathcal{F}$.
The effect of boson-boson interaction on the Bipolaron formation
Creators: name: Jager, Jonas
name: Barnett, Ryan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Impurities immersed into a surrounding ultra-cold Bose gas experience interactions mediated by the surrounding many-body environment. If one focuses on two impurities that are sufficiently close to each other, they can form a bipolaron pair. Here, we discuss how the standard methods based on linearizing the condensate field lead to results only valid in the weak coupling regime and for sufficiently large impurity separations. We show how those shortcomings can be remedied within the Born-Oppenheimer approximation by accounting for boson-boson interactions already on the mean-field level.
The Tensor Theory Space
Creators: name: Rivasseau, Vincent
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The tensor track is a background-independent discretization of quantum gravity which includes a sum over all topologies. We discuss how to define a functional renormalization group flow and the Wetterich equation in the corresponding theory space. This space is different from the Einsteinian theory space of asymptotic safety. It includes all fixed-rank tensor-invariant interactions, hence generalizes matrix models and the (Moyal) non-commutative field theory space.
description: This short note is intended as a complement to arXiv:1311.1461, to appear in the Proceedings of the Workshop on Noncommutative Field Theory and Gravity in Corfu September 2013, Fortshritt. Phys. 2014
A minimum critical blowup rate for the high-dimensional Navier-Stokes equations
Creators: name: Palasek, Stan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 76D03, 35Q30

description: We prove quantitative regularity and blowup theorems for the incompressible Navier-Stokes equations in $\mathbb R^d$, $d\geq4$ when the solution lies in the critical space $L_t^\infty L_x^d$. Explicit subcritical bounds on the solution are obtained in terms of the critical norm. A consequence is that $\|u(t)\|_{L_x^d(\mathbb R^d)}$ grows at a minimum rate of $(\log\log\log\log(T_*-t)^{-1})^c$ along a sequence of times approaching a hypothetical blowup at $T_*$. These results quantify a theorem of Dong and Du and extend the three-dimensional work of Tao.
description: 32 pages, 2 figures. Revised version to appear in JMFM
ACE Bounds; SEMs with Equilibrium Conditions
Creators: name: Richardson, Thomas S.
name: Robins, James M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Discussion of "Instrumental Variables: An Econometrician's Perspective" by Guido W. Imbens [arXiv:1410.0163].
description: Published in at http://dx.doi.org/10.1214/14-STS485 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
From 3D hydrodynamic simulations of common-envelope interaction to gravitational-wave mergers
Creators: name: Moreno, Melvin M.
name: Schneider, Fabian R. N.
name: Roepke, Friedrich K.
name: Ohlmann, Sebastian T.
name: Pakmor, Ruediger
name: Podsiadlowski, Philipp
name: Sand, Christian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Modeling the evolution of progenitors of gravitational-wave merger events in binary stars faces two major uncertainties: the common-envelope phase and supernova kicks. These two processes are critical for the final orbital configuration of double compact-object systems with neutron stars and black holes. Predictive one-dimensional models of common-envelope interaction are lacking and multidimensional simulations are challenged by the vast range of relevant spatial and temporal scales. Here, we present three-dimensional hydrodynamic simulations of the common-envelope interaction of an initially $10\,M_{\odot}$ red supergiant primary star with a black-hole and a neutron-star companion. We show that the high-mass regime is accessible to full ab-initio simulations. Nearly complete envelope ejection is reached assuming that all recombination energy still available at the end of our simulation continues to help unbinding the envelope. In contrast to previous assumptions, we find that the dynamical plunge-in of both companions terminates at orbital separations too wide for gravitational waves to merge the systems in a Hubble time. We discuss the further evolution of the system based on analytical estimates. A subsequent mass-transfer episode from the remaining $3\,M_{\odot}$ core of the supergiant to the compact companion does not shrink the orbit sufficiently either. A neutron-star--neutron-star and neutron-star--black-hole merger is still expected for a fraction of the systems if the supernova kick aligns favorably with the orbital motion. For double neutron star (neutron-star--black-hole) systems we estimate mergers in about $9 \%$ ($1 \%$) of cases while about $77 \%$ ($94 \%$) of binaries are disrupted, i.e., supernova kicks actually enable gravitational-wave mergers in our cases; however, we expect a reduction in predicted gravitational-wave merger events. (abbr.)
description: 16 pages, 11 figures, accepted by A&A
Supplementary material from A renewal-equation approach to estimating $R_t$ and infectious disease case counts in the presence of reporting delays
Creators: name: Bajaj, Sumali
name: Thompson, Robin  N
name: Lambert, Ben
Publisher: name: The Royal Society
Year: 2025
Subjects: classificationCode: 490599
subject: Statistics not elsewhere classified

description: rt_case_estimation_accepted_supplement.pdf
Evidence that UGA is read as a tryptophan codon rather than as a stop codon by Mycoplasma pneumoniae, Mycoplasma genitalium, and Mycoplasma gallisepticum.
Creators: name: Inamine, J M
name: Loechel, S
name: Hu, P C
name: Ho, K C
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1990

description: Molecular cloning and sequencing showed that Mycoplasma gallisepticum, like Mycoplasma capricolum, contains both tRNA(UCA) and tRNA(CCA) genes, while Mycoplasma pneumoniae and Mycoplasma genitalium each appear to have only a tRNA(UCA) gene. Therefore, these mycoplasma species contain a tRNA with the anticodon UCA that can translate both UGA and UGG codons.
The plasma suppression effect can be ignored in realistic FRB models invoking bunched coherent radio emission
Creators: name: Qu, Yuanhong
name: Zhang, Bing
name: Kumar, Pawan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: One widely discussed mechanism to produce highly coherent radio emission of fast radio bursts (FRBs) is coherent emission by bunches, either via curvature radiation or inverse Compton scattering (ICS). It has been suggested that the plasma oscillation effect can significantly suppress coherent emission power by bunches. We examine this criticism in this paper. The suppression factor formalism was derived within the context of radio pulsars in which radio waves are in the low-amplitude, linear regime and cannot directly be applied to the large-amplitude, non-linear regime relevant for FRBs. Even if one applies this linear treatment, plasma suppression is not important for two physical reasons. First, for an efficient radiation mechanism such as ICS, the required plasma density is not high so that a high-density plasma may not exist. Second, both bunched coherent mechanisms demand that a large global parallel electric field ($E_\parallel$) must exist in the emission region in order to continuously inject energy to the bunches to power an FRB. In order to produce typical FRB duration via coherent curvature or ICS radiation, a parallel electric field must be present to balance the acceleration and radiation back-reaction. The plasma suppression factor should be modified with the existence of $E_\parallel$. We show that the correction factor for curvature radiation, $f_{\rm cur}$, increases with $E_\parallel$ and becomes 1 when $E_\parallel$ reaches the radiation-reaction-limited regime. We conclude that the plasma suppression effect can be ignored for realistic FRB emission models invoking bunched coherent radio emission.
description: 9 pages, 2 figures. Accepted for publication in MNRAS
The CCD Controller and Detector
Creators: name: Bonano, G.
name: Bonoli, C.
name: Bortoletto, F.
name: Bruno, P.
name: Comari, M.
name: Cosentino, R.
name: D'Alessandro, M.
name: Fantinel, D.
name: Giro, E.
name: Scuderi, S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: All the scientific instruments of the Italian National Telescope "Galileo" (TNG). as well as the tracking systems and the Shack-Hartmann wavefront systems use CCDs as detectors. The CCD procurement is crucial to optimize the instruments performance, and, of course, equal importance assumes the design and realization of controllers able to drive various kinds of CCDs with a very low readout noise. Detectors characterization is of fundamental importance when they have to be used in scientific instrumentation. Various CCDs have been assembled in cryostats and tested at our laboratory in order to select the suitable detector for the optical instruments of the TNG. The relevant phases of the group activity are here described, as well as the commissioning at the telescope and the work that is in progress.
description: 15 pages
ФОРМИРОВАНИЕ ПРОИЗВОДСТВЕННОЙ ЗАДАЧИ
Creators: name: Ибрагимов, У.М.
name: Аҳадов, А.М.
Publisher: name: Zenodo
Year: 2023

description: В этой стаье разказывается о формирование типа производственной задачи и их табличный и математический вид который входит класс задач линейного программирования, а также их примеры.
The optical imager Galileo (OIG)
Creators: name: F., Bortoletto
name: S., Benetti
name: G., Bonanno
name: C., Bonoli
name: R., Cosentino
name: M., D'Alessandro
name: D., Fantinel
name: A., Ghedina
name: E., Giro
name: A., Magazzu
name: C., Pernechele
name: C, Vuerli
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The present paper describes the construction, the installation and the operation of the Optical Imager Galileo (OIG), a scientific instrument dedicated to the 'imaging' in the visible. OIG was the first instrument installed on the focal plane of the Telescopio Nazionale Galileo (TNG) and it has been extensively used for the functional verification of several parts of the telescope (as an example the optical quality, the rejection of spurious light, the active optics and the tracking), in the same way also several parts of the TNG informatics system (instrument commanding, telemetry and data archiving) have been verified making extensive use of OIG. This paper provides also a frame of work for a further development of the imaging dedicated instrumentation inside TNG. OIG, coupled with the first near-IR camera (ARNICA), has been the 'workhorse instrument' during the first period of telescope experimental and scientific scheduling.
$H^\infty$-calculus for the surface Stokes operator and applications
Creators: name: Simonett, Gieri
name: Wilke, Mathias
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q35, 35Q30, 35B40

description: We consider a smooth, compact and embedded hypersurface $Σ$ without boundary and show that the corresponding (shifted) surface Stokes operator $ω+A_{S,Σ}$ admits a bounded $H^\infty$-calculus with angle smaller than $π/2$, provided $ω>0$. As an application, we consider critical spaces for the Navier-Stokes equations on the surface $Σ$. In case $Σ$ is two-dimensional, we show that any solution with a divergence-free initial value in $L_2(Σ,\mathsf{T}Σ)$ exists globally and converges exponentially fast to an equilibrium, that is, to a Killing field.
description: 25 pages
On the reliability of microvariability tests in quasars
Creators: name: de Diego, José A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Microvariations probe the physics and internal structure of quasars. Unpredictability and small flux variations make this phenomenon elusive and difficult to detect. Variance based probes such as the C and F tests, or a combination of both, are popular methods to compare the light-curves of the quasar and a comparison star. Recently, detection claims in some studies depend on the agreement of the results of the C and F tests, or of two instances of the F-test, in rejecting the non-variation null hypothesis. However, the C-test is a non-reliable statistical procedure, the F-test is not robust, and the combination of tests with concurrent results is anything but a straightforward methodology. A priori Power Analysis calculations and post hoc analysis of Monte-Carlo simulations show excellent agreement for the Analysis of Variance test to detect microvariations, as well as the limitations of the F-test. Additionally, combined tests yield correlated probabilities that make the assessment of statistical significance unworkable. However, it is possible to include data from several field stars to enhance the power in a single F-test, increasing the reliability of the statistical analysis. This would be the preferred methodology when several comparison stars are available. An example using two stars and the enhanced F-test is presented. These results show the importance of using adequate methodologies, and avoid inappropriate procedures that can jeopardize microvariability detections. Power analysis and Monte-Carlo simulations are useful tools for research planning, as they can reveal the robustness and reliability of different research approaches.
description: The Astronomical Journal, in press. 13 figures. Please request more readable version from the author (jdo@astro.unam.mx)
Cluster Purging: Efficient Outlier Detection based on Rate-Distortion Theory
Creators: name: Toller, Maximilian B.
name: Geiger, Bernhard C.
name: Kern, Roman
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Rate-distortion theory-based outlier detection builds upon the rationale that a good data compression will encode outliers with unique symbols. Based on this rationale, we propose Cluster Purging, which is an extension of clustering-based outlier detection. This extension allows one to assess the representivity of clusterings, and to find data that are best represented by individual unique clusters. We propose two efficient algorithms for performing Cluster Purging, one being parameter-free, while the other algorithm has a parameter that controls representivity estimations, allowing it to be tuned in supervised setups. In an experimental evaluation, we show that Cluster Purging improves upon outliers detected from raw clusterings, and that Cluster Purging competes strongly against state-of-the-art alternatives.
Genetic evidence that Neisseria gonorrhoeae produces specific receptors for transferrin and lactoferrin.
Creators: name: Koch, G G
name: Adams, J
name: Davis, S M
name: Biswas, G D
name: Tsai, J
name: Dyer, D W
name: Blanton, K J
name: Sparling, P F
name: Sen, P K
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1990

description: Transferrin (TF) and lactoferrin (LF) are probably the major sources of iron (Fe) for Neisseria gonorrhoeae in vivo. We isolated mutants of N. gonorrhoeae FA19 that were unable to grow with Fe bound to either TF (TF-) or LF (LF-) or to both TF and LF ([TF LF]-). The amount of Fe internalized by each of the mutants was reduced to background levels from the relevant iron source(s). The wild-type parent strain exhibited saturable specific binding of TF and LF; receptor activity was induced by Fe starvation. The TF(-)-specific or LF(-)-specific mutants were almost completely lacking in receptor activity for TF or LF, respectively, whereas the [TF LF]- mutants bound both TF and LF as well as the wild-type strain. All mutants utilized citrate and heme normally as Fe sources. These results demonstrate that ability to bind TF or LF is essential for gonococci to scavenge appreciable amounts of Fe from these sources in vitro. In addition, the TF and LF Fe acquisition pathways are linked by the mutual use of a nonreceptor gene product that is essential to Fe scavenging from both of these sources; this gene product is not required for Fe acquisition from other sources.