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Journal articles on the topic 'Blr-1'

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Published: 4 June 2021

Last updated: 8 February 2022

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1

Casas-Flores, Sergio, Mauricio Rios-Momberg, Martha Bibbins, Patricia Ponce-Noyola, and Alfredo Herrera-Estrella. "BLR-1 and BLR-2, key regulatory elements of photoconidiation and mycelial growth in Trichoderma atroviride." Microbiology 150, no. 11 (November 1, 2004): 3561–69. http://dx.doi.org/10.1099/mic.0.27346-0.

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In fungi, phototropism, the induction of carotenogenesis and reproductive structures, and resetting of the circadian rhythm are controlled by blue light. Trichoderma atroviride, a fungus used in biological control, sporulates in a synchronized manner following a brief pulse of blue light. Due to its apparent simplicity, this response was chosen for pursuing photoreceptor isolation. Two genes were cloned, blue-light regulators 1 and 2 (blr-1 and blr-2), similar to the Neurospora crassa white-collar 1 and 2, respectively. The BLR-1 protein has all the characteristics of a blue-light photorecepto

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Sánchez-Arreguín, Alejandro, Ana Silvia Pérez-Martínez, and Alfredo Herrera-Estrella. "Proteomic Analysis of Trichoderma atroviride Reveals Independent Roles for Transcription Factors BLR-1 and BLR-2 in Light and Darkness." Eukaryotic Cell 11, no. 1 (November 4, 2011): 30–41. http://dx.doi.org/10.1128/ec.05263-11.

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ABSTRACT The genus Trichoderma is one of the most widely used biological control agents of plant-pathogenic fungi. The main mechanism for survival and dispersal of Trichoderma is through the production of asexual spores (conidia). The transition from filamentous growth to conidiation can be triggered by light, nutrient deprivation, and mechanical damage of the mycelium. We conducted proteomic profiling analyses of Trichoderma atroviride after a blue light pulse. The use of two-dimensional electrophoresis (2-DE) and mass spectrometry (MS) analysis allowed us to identify 72 proteins whose expres

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Cohen, Joshua L., Matthew E. Glover, Phyllis C. Pugh, Andrew D. Fant, Rebecca K. Simmons, Huda Akil, Ilan A. Kerman, and Sarah M. Clinton. "Maternal Style Selectively Shapes Amygdalar Development and Social Behavior in Rats Genetically Prone to High Anxiety." Developmental Neuroscience 37, no. 3 (2015): 203–14. http://dx.doi.org/10.1159/000374108.

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The early-life environment critically influences neurodevelopment and later psychological health. To elucidate neural and environmental elements that shape emotional behavior, we developed a rat model of individual differences in temperament and environmental reactivity. We selectively bred rats for high versus low behavioral response to novelty and found that high-reactive (bred high-responder, bHR) rats displayed greater risk-taking, impulsivity and aggression relative to low-reactive (bred low-responder, bLR) rats, which showed high levels of anxiety/depression-like behavior and certain str

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Casas-Flores, Sergio, Mauricio Rios-Momberg, Teresa Rosales-Saavedra, Pedro Martínez-Hernández, Vianey Olmedo-Monfil, and Alfredo Herrera-Estrella. "Cross Talk between a Fungal Blue-Light Perception System and the Cyclic AMP Signaling Pathway." Eukaryotic Cell 5, no. 3 (March 2006): 499–506. http://dx.doi.org/10.1128/ec.5.3.499-506.2006.

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ABSTRACT Blue light regulates many physiological and developmental processes in fungi. In Trichoderma atroviride the complex formed by the BLR-1 and BLR-2 proteins appears to play an essential role as a sensor and transcriptional regulator in photoconidiation. Here we demonstrate that the BLR proteins are necessary for carbon deprivation induced conidiation, even in the absence of light, pointing to the existence of an unprecedented cross talk between light and carbon sensing. Further, in contrast to what has been found in all other fungal systems, clear BLR-independent blue-light responses, i

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Lee, Jong-Gi, Jin-Soo Bae, Yeo-Hoon Yoon, Jun-Ho Lee, and Kang-Young Cho. "Enhancement of Board Level Reliability on Automotive DRAM Package by Optimized Thermal & Mechanical Properties." International Symposium on Microelectronics 2020, no. 1 (September 1, 2020): 000073–77. http://dx.doi.org/10.4071/2380-4505-2020.1.000073.

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Abstract As increased in demand for using memory devices in automotive applications, board level reliability (BLR) has been the one of the critical issue for using FBGA type packages in automotive. The required specification of BLR is listed in various standards (AEC-Q100, Q104 etc) and it is varied by automotive application customers. Most of customers are targeting grade from 1 to 3, however, requirement to memory package is grade 1 (−40°C~125°C). Currently low power (LP) memory device is widely adopted in automotive applications due to its wide bandwidth and high density capability. From pa

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Friedl, Martina A., Christian P. Kubicek, and Irina S. Druzhinina. "Carbon Source Dependence and Photostimulation of Conidiation in Hypocrea atroviridis." Applied and Environmental Microbiology 74, no. 1 (November 2, 2007): 245–50. http://dx.doi.org/10.1128/aem.02068-07.

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ABSTRACT Hypocrea atroviridis is frequently used as a photomorphogenetic model due to its ability to conidiate upon exposure to light. Light is thereby believed to be the primary trigger for spore formation. In contrast, we show here that conidiation is primarily carbon source dependent and that illumination plays a catalytic role; of a total of 95 tested carbon sources, only a small set of carbohydrates, polyols, and sugar acids allowed conidiation in darkness, and on most of them, conidiation was significantly more strongly expressed in light. In addition, there are also a number of carbon s

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Shardell, Michelle, Neeta Parimi, Lisa Langsetmo, Toshiko Tanaka, Lingjing Jiang, Eric Orwoll, James M. Shikany, Deborah M. Kado, and Peggy M. Cawthon. "Comparing Analytical Methods for the Gut Microbiome and Aging: Gut Microbial Communities and Body Weight in the Osteoporotic Fractures in Men (MrOS) Study." Journals of Gerontology: Series A 75, no. 7 (February 6, 2020): 1267–75. http://dx.doi.org/10.1093/gerona/glaa034.

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Abstract Determining the role of gut microbial communities in aging-related phenotypes, including weight loss, is an emerging gerontology research priority. Gut microbiome datasets comprise relative abundances of microbial taxa that necessarily sum to 1; analysis ignoring this feature may produce misleading results. Using data from the Osteoporotic Fractures in Men (MrOS) study (n = 530; mean [SD] age = 84.3 [4.1] years), we assessed 163 genera from stool samples and body weight. We compared conventional analysis, which does not address the sum-to-1 constraint, to compositional analysis, which

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McCreary, Erin K., Lloyd Clarke, Rachel V. Marini, Minh-Hong Nguyen, Cornelius J. Clancy та Ryan K. Shields. "656. Prioritizing Gram-Negative Bacteremia (GNB) Cases for Rapid Detection by β-Lactam Resistance (BLR) and Patient Outcomes". Open Forum Infectious Diseases 6, Supplement_2 (жовтень 2019): S301—S302. http://dx.doi.org/10.1093/ofid/ofz360.724.

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Abstract Background GNB is associated with significant morbidity and mortality. The availability of rapid diagnostic tests (RDTs) provides an opportunity to improve outcomes. Our goal was to review GNB and its empiric treatment at our center in order to devise rational approaches to diagnostic stewardship and use of RDTs. Methods All patients with GNB from 2010 to 2018 were evaluated. BLR was defined by 2019 CLSI breakpoints; phenotypes are shown in Table 1. Results A total of 2795 GNB cases were included (Table 2); 57% occurred within the first 24 hours of hospitalization and 29.3% in the ICU

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Capetti, Alessandro, Ari Laor, Ranieri D. Baldi, Andrew Robinson, and Alessandro Marconi. "Spectropolarimetry of low redshift quasars: origin of the polarization and implications for black hole mass estimates." Monthly Notices of the Royal Astronomical Society 502, no. 4 (February 3, 2021): 5086–103. http://dx.doi.org/10.1093/mnras/stab279.

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ABSTRACT We present the results of high signal-to-noise ratio VLT spectropolarimetry of a representative sample of 25 bright type 1 AGN at z &lt; 0.37, of which nine are radio-loud. The sample covers uniformly the 5100 Å optical luminosity at L5100 ∼ 1044−1046 erg s−1, and H α width at FWHM ∼ 1000−10 000 $\rm {\, km \, s}^{-1}$. We derive the continuum and the H α polarization amplitude, polarization angle, and angle swing across the line, together with the radio properties. We find the following: (1) The broad line region (BLR) and continuum polarization are both produced by a single scat

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Rosales-Saavedra, T., E. U. Esquivel-Naranjo, S. Casas-Flores, P. Martínez-Hernández, E. Ibarra-Laclette, C. Cortes-Penagos, and A. Herrera-Estrella. "Novel light-regulated genes in Trichoderma atroviride: a dissection by cDNA microarrays." Microbiology 152, no. 11 (November 1, 2006): 3305–17. http://dx.doi.org/10.1099/mic.0.29000-0.

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The influence of light on living organisms is critical, not only because of its importance as the main source of energy for the biosphere, but also due to its capacity to induce changes in the behaviour and morphology of nearly all forms of life. The common soil fungus Trichoderma atroviride responds to blue light in a synchronized manner, in time and space, by forming a ring of green conidia at what had been the colony perimeter at the time of exposure (photoconidiation). A putative complex formed by the BLR-1 and BLR-2 proteins in T. atroviride appears to play an essential role as a sensor a

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Shardell, Michelle, Neeta Parimi, Lisa Langsetmo, Eric Orwoll, James Shikany, Deborah Kado, and Peggy Cawthon. "Comparing Analytical Methods for Gut Microbiome and Aging: Gut Microbiota and Body Weight in the MrOS." Innovation in Aging 4, Supplement_1 (December 1, 2020): 839. http://dx.doi.org/10.1093/geroni/igaa057.3074.

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Abstract Gut microbiome datasets comprise microbial taxa relative abundances that necessarily sum to 1; analysis ignoring this feature may produce misleading results. We assessed 163 genera from the first batch of Microbiome Ancillary Study (n=530) stool samples and examined associations between microbiota and body weight. We compared conventional Bayesian linear regression (BLR) and network analysis to their compositional counterparts, adjusting for past weight and other covariates. Conventional BLR identified Roseburia and Dialister (positive association) and Coprococcus-1 (negative associat

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Devereux, Nick. "The dynamics of the broad-line region in NGC 3227." Monthly Notices of the Royal Astronomical Society 500, no. 1 (October 1, 2020): 786–94. http://dx.doi.org/10.1093/mnras/staa3005.

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ABSTRACT Archival Hubble Space Telescope (HST) observations of the Seyfert 1 nucleus of NGC 3227 obtained with the Space Telescope Imaging Spectrograph (STIS) are re-examined in order to constrain a viable photoionization model for the broad-line region (BLR). The results imply that the BLR is a partially ionized, dust-free, spherical shell that is collapsing, supersonically, at the free-fall velocity due to its proximity to a supermassive black hole. The BLR is ionization bounded at the outer radius, coincident with the dust reverberation radius, and transforms into an X-ray emitting plasma i

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Panda, Swayamtrupta. "The CaFe project: Optical Fe II and near-infrared Ca II triplet emission in active galaxies: simulated EWs and the co-dependence of cloud size and metal content." Astronomy & Astrophysics 650 (June 2021): A154. http://dx.doi.org/10.1051/0004-6361/202140393.

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Aims. Modelling the low-ionisation lines (LILs) in active galactic nuclei (AGNs) still faces problems in explaining the observed equivalent widths (EWs) when realistic covering factors are used and the distance of the broad-line region (BLR) from the centre is assumed to be consistent with the reverberation mapping measurements. We re-emphasise this problem and suggest that the BLR ‘sees’ a different continuum from that seen by a distant observer. This change in the continuum reflected in the change in the net bolometric luminosity from the AGN is then able to resolve the above problem. Method

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Ramolla, Michael, Martin Haas, Christian Westhues, Francisco Pozo Nuñez, Catalina Sobrino Figaredo, Julia Blex, Matthias Zetzl та ін. "Simultaneous Hα and dust reverberation mapping of 3C 120: Testing the bowl-shaped torus geometry". Astronomy & Astrophysics 620 (грудень 2018): A137. http://dx.doi.org/10.1051/0004-6361/201732081.

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We monitored the Seyfert-1 galaxy 3C 120 between September 2014 and March 2015 at the Universitätssternwarte Bochum near Cerro Armazones in BVRIJK and a narrowband filter covering the redshifted Hα line. In addition we obtained a single contemporary spectrum with the spectrograph FAST at Mt. Hopkins. Compared to earlier epochs 3C 120 is about a factor of three brighter, allowing us to study the shape of the broad line region (BLR) and the dust torus in a high luminosity phase. The analysis of the light curves yields that the dust echo is rather sharp and symmetric in contrast to the more compl

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Hermosa Muñoz, Laura, Sara Cazzoli, Isabel Márquez, and Josefa Masegosa. "Optical spectroscopy of type-2 LINERs." Proceedings of the International Astronomical Union 15, S356 (October 2019): 317–19. http://dx.doi.org/10.1017/s174392132000321x.

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AbstractLow-Ionisation Nuclear Emission-line Regions (LINERs) are the least luminous and the most numerous among the local population of Active Galactic Nuclei (AGN). They can be classified as type-1 or type-2 if their optical spectra show or do not show, respectively, a broad component. It is associated with the presence of a Broad Line Region (BLR) in these systems. However, recent studies have proven that the classification of type-1 LINERs may be controversial, since space- and ground-based spectroscopy provide contradicting results on the presence of very broad components (Cazzoli et al.2

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Korista, K. T., and M. R. Goad. "Quantifying the impact of variable BLR diffuse continuum contributions on measured continuum interband delays." Monthly Notices of the Royal Astronomical Society 489, no. 4 (August 23, 2019): 5284–300. http://dx.doi.org/10.1093/mnras/stz2330.

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ABSTRACT We investigate the contribution of reprocessed continuum emission (1000–10 000 Å) originating in broad-line region (BLR) gas, the diffuse continuum (DC), to the wavelength-dependent continuum delays measured in AGN disc reverberation mapping experiments. Assuming a spherical BLR geometry, we adopt a Local Optimally emitting Cloud (LOC) model for the BLR that approximately reproduces the broad emission-line strengths of the strongest UV lines (Ly α and C iv) in NGC 5548. Within this LOC framework, we explore how assumptions about the gas hydrogen density and column density distribution

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Nguyen, Dieu D., Takuma Izumi, Sabine Thater, Masatoshi Imanishi, Taiki Kawamuro, Shunsuke Baba, Suzuka Nakano, et al. "Black hole mass measurement using ALMA observations of [CI] and CO emissions in the Seyfert 1 galaxy NGC 7469." Monthly Notices of the Royal Astronomical Society 504, no. 3 (April 21, 2021): 4123–42. http://dx.doi.org/10.1093/mnras/stab1002.

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ABSTRACT We present a supermassive black hole (SMBH) mass measurement in the Seyfert 1 galaxy NGC 7469 using Atacama Large Millimeter/submillimeter Array (ALMA) observations of the atomic-[CI](1–0) and molecular-12CO(1–0) emission lines at the spatial resolution of ≈0${_{.}^{\prime\prime}}$3 (or ≈100 pc). These emissions reveal that NGC 7469 hosts a circumnuclear gas disc (CND) with a ring-like structure and a two-arm/bi-symmetric spiral pattern within it, surrounded by a starbursting ring. The CND has a relatively low σgas/V ≈ 0.35 (r ≲ 0${_{.}^{\prime\prime}}$5) and ≈0.19 (r &gt; 0${_{.}

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Savić, D., R. Goosmann, L. Č. Popović, F. Marin, and V. L. Afanasiev. "AGN black hole mass estimates using polarization in broad emission lines." Astronomy & Astrophysics 614 (June 2018): A120. http://dx.doi.org/10.1051/0004-6361/201732220.

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Context. The innermost regions in active galactic nuclei (AGNs) have not yet been spatially resolved, but spectropolarimetry can provide insight into their hidden physics and geometry. From spectropolarimetric observations in broad emission lines and assuming equatorial scattering as a dominant polarization mechanism, it is possible to estimate the mass of supermassive black holes (SMBHs) residing at the center of AGNs. Aims. We explore the possibilities and limits, and put constraints on the method for determining SMBH masses using polarization in broad emission lines by providing more in-dep

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Hermosa Muñoz, L., S. Cazzoli, I. Márquez, and J. Masegosa. "Optical spectroscopy of type 2 LINERs." Astronomy & Astrophysics 635 (March 2020): A50. http://dx.doi.org/10.1051/0004-6361/201936680.

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Context. Type 2 Low-ionization Nuclear Emission-line Regions (LINERs) have been optically classified with the Palomar data as not presenting a broad component in the Balmer emission lines that are associated with the broad-line region (BLR) of the active galactic nuclei (AGN). Aims. We aim to unveil the presence of different kinematic components of emission lines in the nuclear region of a sample of local (z ≤ 0.022) type 2 LINERs. We focus on the analysis of the true nature of LINERs by means of the detection (or nondetection) of a broad component that originated in the BLR of the AGN. Additi

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Vietri, G., V. Mainieri, D. Kakkad, H. Netzer, M. Perna, C. Circosta, C. M. Harrison, et al. "SUPER." Astronomy & Astrophysics 644 (December 2020): A175. http://dx.doi.org/10.1051/0004-6361/202039136.

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Aims. The SINFONI survey for Unveiling the Physics and Effect of Radiative feedback (SUPER) was designed to conduct a blind search for AGN-driven outflows on X-ray-selected AGNs at redshift z ∼ 2 with high (∼2 kpc) spatial resolution, and to correlate them with the properties of their host galaxy and central black hole. The main aims of this paper are: (a) to derive reliable estimates for the masses of the black holes and accretion rates for the Type-1 AGNs in this survey; and (b) to characterise the properties of the AGN-driven winds in the broad line region (BLR). Methods. We analysed rest-f

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Kaspi, Shai. "Recent results of measuring black hole masses via reverberation mapping." Proceedings of the International Astronomical Union 15, S356 (October 2019): 116–21. http://dx.doi.org/10.1017/s1743921320002707.

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AbstractOver the past three decades more than 100 Active Galactic Nuclei (AGNs) were measured using the reverberation mapping technique. This technique uses the response of the line emission in the Broad Line Region (BLR) to continuum emission variation and yields a measure for the distance of the BLR from the central Black Hole (BH). This in turn is used to measure the BH’s mass. Almost all of these measurements are of low-luminosity AGNs while for quasars with luminosities higher than 1046 rg s−1 there are hardly any attempts of reverberation mapping. This contribution reports on recent resu

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Kaspi, Shai. "Results from Five Years of Spectrophotometric Monitoring of 28 Palomar-Green Quasars." International Astronomical Union Colloquium 159 (1997): 159–62. http://dx.doi.org/10.1017/s0252921100039877.

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AbstractWe present 5 years of results from a spectrophotometric monitoring program of 28 quasars. The typical sampling intervals are several months. We show the light curves obtained for two quasars, PG 0804+762 and PG 0953+414. Both sources show Balmer emissionline variations which follow those of the continuum with a time lag of order 100 days. This is the first reliable measurement of such a lag in active galactic nuclei with luminosity L > 1045 erg s−1. The broad-line region (BLR) size that is implied is almost an order of magnitude larger than that measured in several Seyfert 1 galaxie

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Romano, P., M. Böttcher, L. Foschini, C. Boisson, S. Vercellone та M. Landoni. "Prospects for γ-ray observations of narrow-line Seyfert 1 galaxies with the Cherenkov Telescope Array – II. γ–γ absorption in the broad-line region radiation fields". Monthly Notices of the Royal Astronomical Society 494, № 1 (3 березня 2020): 411–24. http://dx.doi.org/10.1093/mnras/staa600.

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ABSTRACT Gamma-ray emitting narrow-line Seyfert 1 (γ-NLS1) galaxies possibly harbour relatively low-mass black holes (106–108 M⊙) accreting close to the Eddington limit, and share many characteristics with their sibling sources, flat-spectrum radio quasars. Although they have been detected in the MeV–GeV band with Fermi–LAT, they have never been seen in the very high energy band with current imaging atmospheric Cherenkov telescopes (IACTs). Thus, they are key targets for the next-generation IACT, the Cherenkov Telescope Array (CTA). In a previous work we selected, by means of extensive simulat

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Laor, Ari, Buell T. Jannuzi, Richard F. Green та Todd A. Boroson. "The HST Spectrum of I Zw 1: Implications of the C III* λ1176 Emission Line". International Astronomical Union Colloquium 159 (1997): 116–17. http://dx.doi.org/10.1017/s0252921100039762.

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AbstractI Zw 1 is a well-known narrow-line quasar with very strong Fe II emission. High S/N spectra obtained with the HST FOS show a remarkably rich emission-line spectrum. The C III*λ1176 line is clearly detected in emission for the first time in AGNs. This line arises from radiative decay to the 2s2p3Pº0,1,2 metastable levels of C III. The observed flux is ~ 50 times larger than expected from collisional excitation or dielectronic recombination in photoionized gas. The most plausible mechanism for the large enhancement in the C III* λ1176 flux is resonance scattering of continuum photons by

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Son, Dong-Hoon, and Siek Hyung. "IUE SPECTRA OF SEYEERT 1 GALAXY NGC 7469-BLR CHARACTERISTICS OF NGC 7469." Journal of Astronomy and Space Sciences 22, no. 3 (September 1, 2005): 187–96. http://dx.doi.org/10.5140/jass.2005.22.3.187.

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Ilić, Dragana. "The BLR physics from the long-term optical monitoring of type-1 AGN." Proceedings of the International Astronomical Union 15, S356 (October 2019): 144. http://dx.doi.org/10.1017/s1743921320002768.

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AbstractThe variation of optical continuum and broad emission lines is observed in all type 1 active galactic nuclei (AGN). In some cases even extreme variability is detected when broad-line profiles completely disappear as is the case in the co-called changing-look AGN, which raise new question on the theoretical model of AGN. This variability is an important tool to study the physics and geometry of the broad line region (BLR), e.g. it can be used to estimate its size through the reverberation mapping technique. Especially, long-term campaigns give new insights, like the detection of the per

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Popović, Luka Č., Victor L. Afanasiev, and Djordje Savić. "Black hole mass measurements in AGN: Polarization in broad emission lines." Proceedings of the International Astronomical Union 14, S342 (May 2018): 1–4. http://dx.doi.org/10.1017/s1743921318007640.

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AbstractWe present a new method for supermassive black hole (SMBH) mass measurements in Type 1 active galactic nuclei (AGN) using polarization angle across broad lines. This method gives measured masses which are in a good agreement with reverberation estimates. Additionally, we explore the possibilities and limits of this method using the STOKES radiative transfer code taking a dominant Keplerian motion in the broad line region (BLR). We found that this method can be used for the direct SMBH mass estimation in the cases when in addition to the Kepler motion, radial inflows or vertical outflow

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Panda, Swayamtrupta, Paola Marziani та Bożena Czerny. "Feii strength in NLS1s – dependence on the viewing angle and FWHM(Hβ)". Proceedings of the International Astronomical Union 15, S356 (жовтень 2019): 332–34. http://dx.doi.org/10.1017/s1743921320003269.

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AbstractWe address the effect of orientation of the accretion disk plane and the geometry of the broad line region (BLR) in the context of understanding the distribution of quasars along their Main Sequence. We utilize the photoionization code CLOUDY to model the BLR, incorporating the ‘un-constant’ virial factor. We show the preliminary results of the analysis to highlight the co-dependence of the Eigenvector 1 parameter, RFeII on the broad HβFWHM (i.e. the line dispersion) and the inclination angle (θ), assuming fixed values for the Eddington ratio (Lbol/ LEdd), black hole mass (MBH), spectr

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Xue, S. J., and F. Z. Cheng. "Reverberation Mapping Analysis of the Broad-Line Region in Seyfert Galaxy NGC 4151." Symposium - International Astronomical Union 188 (1998): 424–25. http://dx.doi.org/10.1017/s0074180900115840.

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One of the primary goals of AGN variability studies has been to determine the size of broad-line region (BLR) through the reverberation mapping technique. In a recent international multiwavelength spectroscopic monitoring campaign, NGC 4151 has been observed intensively by ground-based telescopes for a period of over 2 months, with a typical temporal resolution of 1 day. The main result from this optical campaign is that finding the variation in the emission line flux (Hβ or Hα) lagging the continuum by 0-3 days (1993 campaign: Kaspi et al. 1996). This is in contrast to the past results in whi

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Sapitang, Michelle, Wanie M. Ridwan, Khairul Faizal Kushiar, Ali Najah Ahmed, and Ahmed El-Shafie. "Machine Learning Application in Reservoir Water Level Forecasting for Sustainable Hydropower Generation Strategy." Sustainability 12, no. 15 (July 30, 2020): 6121. http://dx.doi.org/10.3390/su12156121.

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The aim of this study is to accurately forecast the changes in water level of a reservoir located in Malaysia with two different scenarios; Scenario 1 (SC1) includes rainfall and water level as input and Scenario 2 (SC2) includes rainfall, water level, and sent out. Different time horizons (one day ahead to seven days) will be investigated to check the accuracy of the proposed models. In this study, four supervised machine learning algorithms for both scenarios were proposed such as Boosted Decision Tree Regression (BDTR), Decision Forest Regression (DFR), Bayesian Linear Regression (BLR) and

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Nhu, Viet-Ha, Danesh Zandi, Himan Shahabi, Kamran Chapi, Ataollah Shirzadi, Nadhir Al-Ansari, Sushant K. Singh, Jie Dou, and Hoang Nguyen. "Comparison of Support Vector Machine, Bayesian Logistic Regression, and Alternating Decision Tree Algorithms for Shallow Landslide Susceptibility Mapping along a Mountainous Road in the West of Iran." Applied Sciences 10, no. 15 (July 22, 2020): 5047. http://dx.doi.org/10.3390/app10155047.

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This paper aims to apply and compare the performance of the three machine learning algorithms–support vector machine (SVM), bayesian logistic regression (BLR), and alternating decision tree (ADTree)–to map landslide susceptibility along the mountainous road of the Salavat Abad saddle, Kurdistan province, Iran. We identified 66 shallow landslide locations, based on field surveys, by recording the locations of the landslides by a global position System (GPS), Google Earth imagery and black-and-white aerial photographs (scale 1: 20,000) and 19 landslide conditioning factors, then tested these fac

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Müller, A. L., and G. E. Romero. "Radiation from the impact of broad-line region clouds onto AGN accretion disks." Astronomy & Astrophysics 636 (April 2020): A92. http://dx.doi.org/10.1051/0004-6361/202037639.

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Context. Active galactic nuclei are supermassive black holes surrounded by an accretion disk, two populations of clouds, bipolar jets, and a dusty torus. The clouds move in Keplerian orbits at high velocities. In particular, the broad-line region (BLR) clouds have velocities ranging from 1000 to 10 000 km s−1. Given the extreme proximity of these clouds to the supermassive black hole, frequent collisions with the accretion disk should occur. Aims. The impact of BLR clouds onto the accretion disk can produce strong shock waves where particles might be accelerated. The goal of this work is to in

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Amorim, A., M. Bauböck, W. Brandner, M. Bolzer, Y. Clénet, R. Davies, P. T. de Zeeuw, et al. "The central parsec of NGC 3783: a rotating broad emission line region, asymmetric hot dust structure, and compact coronal line region." Astronomy & Astrophysics 648 (April 2021): A117. http://dx.doi.org/10.1051/0004-6361/202040061.

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Using VLTI/GRAVITY and SINFONI data, we investigate the subparsec gas and dust structure around the nearby type 1 active galactic nucleus (AGN) hosted by NGC 3783. The K-band coverage of GRAVITY uniquely allows simultaneous analysis of the size and kinematics of the broad line region (BLR), the size and structure of the near-infrared(near-IR)-continuum-emitting hot dust, and the size of the coronal line region (CLR). We find the BLR, probed through broad Brγ emission, to be well described by a rotating, thick disc with a radial distribution of clouds peaking in the inner region. In our BLR mod

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Steyaert, Johanna M., Richard J. Weld, Artemio Mendoza-Mendoza, and Alison Stewart. "Reproduction without sex: conidiation in the filamentous fungus Trichoderma." Microbiology 156, no. 10 (October 1, 2010): 2887–900. http://dx.doi.org/10.1099/mic.0.041715-0.

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Trichoderma spp. have served as models for asexual reproduction in filamentous fungi for over 50 years. Physical stimuli, such as light exposure and mechanical injury to the mycelium, trigger conidiation; however, conidiogenesis itself is a holistic response determined by the cell's metabolic state, as influenced by the environment and endogenous biological rhythms. Key environmental parameters are the carbon and nitrogen status and the C : N ratio, the ambient pH and the level of calcium ions. Recent advances in our understanding of the molecular biology of this fungus have revealed a conserv

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Gosalbes, M. J., Y. Vallès, N. Jiménez-Hernández, C. Balle, P. Riva, S. Miravet-Verde, L. E. de Vries, et al. "High frequencies of antibiotic resistance genes in infants’ meconium and early fecal samples." Journal of Developmental Origins of Health and Disease 7, no. 1 (September 10, 2015): 35–44. http://dx.doi.org/10.1017/s2040174415001506.

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The gastrointestinal tract (GIT) microbiota has been identified as an important reservoir of antibiotic resistance genes (ARGs) that can be horizontally transferred to pathogenic species. Maternal GIT microbes can be transmitted to the offspring, and recent work indicates that such transfer starts before birth. We have used culture-independent genetic screenings to explore whether ARGs are already present in the meconium accumulated in the GIT during fetal life and in feces of 1-week-old infants. We have analyzed resistance to β-lactam antibiotics (BLr) and tetracycline (Tcr), screening for a

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Raiteri, C. M., J. A. Acosta Pulido, M. Villata, M. I. Carnerero, P. Romano, and S. Vercellone. "Unveiling the monster heart: unbeamed properties of blazar 4C 71.07." Monthly Notices of the Royal Astronomical Society 493, no. 2 (February 17, 2020): 2793–804. http://dx.doi.org/10.1093/mnras/staa453.

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ABSTRACT 4C 71.07 is a high-redshift blazar whose optical radiation is dominated by quasar-like nuclear emission. We here present the results of a spectroscopic monitoring of the source to study its unbeamed properties. We obtained 24 optical spectra at the Nordic Optical Telescope and William Herschel Telescope and 3 near-infrared spectra at the Telescopio Nazionale Galileo. They show no evidence of narrow emission lines. The estimate of the systemic redshift from the Hβ and Hα broad emission lines leads to zsys = 2.2130 ± 0.0004. Notwithstanding the nearly face-on orientation of the accretio

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Amorim, A., M. Bauböck, W. Brandner, Y. Clénet, R. Davies, P. T. de Zeeuw, J. Dexter, et al. "The spatially resolved broad line region of IRAS 09149−6206." Astronomy & Astrophysics 643 (November 2020): A154. http://dx.doi.org/10.1051/0004-6361/202039067.

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We present new near-infrared VLTI/GRAVITY interferometric spectra that spatially resolve the broad Brγ emission line in the nucleus of the active galaxy IRAS 09149−6206. We use these data to measure the size of the broad line region (BLR) and estimate the mass of the central black hole. Using an improved phase calibration method that reduces the differential phase uncertainty to 0.05° per baseline across the spectrum, we detect a differential phase signal that reaches a maximum of ∼0.5° between the line and continuum. This represents an offset of ∼120 μas (0.14 pc) between the BLR and the cent

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Acciari, V. A., S. Ansoldi, L. A. Antonelli, A. Arbet Engels, C. Arcaro, D. Baack, A. Babić, et al. "Detection of persistent VHE gamma-ray emission from PKS 1510–089 by the MAGIC telescopes during low states between 2012 and 2017." Astronomy & Astrophysics 619 (November 2018): A159. http://dx.doi.org/10.1051/0004-6361/201833618.

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Context. PKS 1510–089 is a flat spectrum radio quasar strongly variable in the optical and GeV range. To date, very high-energy (VHE, > 100 GeV) emission has been observed from this source either during long high states of optical and GeV activity or during short flares. Aims. We search for low-state VHE gamma-ray emission from PKS 1510–089. We characterize and model the source in a broadband context, which would provide a baseline over which high states and flares could be better understood. Methods. PKS 1510–089 has been monitored by the MAGIC telescopes since 2012. We use daily binned Fe

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Vercellone, Stefano, Luigi Foschini, Patrizia Romano, Markus Böttcher, and Catherine Boisson. "High-Energy and Very High-Energy Constraints from Log-Parabolic Spectral Models in Narrow-Line Seyfert 1 Galaxies." Universe 6, no. 4 (April 16, 2020): 54. http://dx.doi.org/10.3390/universe6040054.

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Narrow-line Seyfert 1 galaxies (NLSy1s) are a well established class of γ -ray sources, showing the presence of a jet like the more common flat-spectrum radio quasars. The evidence of γ -ray emission poses the issue of the location of the γ -ray emitting zone and of the contribution of the γ - γ absorption within the broad-line region (BLR), since such objects have been detected by Fermi-LAT in the MeV-GeV energy range but not by imaging atmospheric Cherenkov telescopes beyond 100 GeV. We discuss how the spectral properties of three NLSy1s (SBS 0846+513, PMN J0948+0022, and PKS 1502+036) deriv

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Esser, J., J. U. Pott, H. Landt, and W. D. Vacca. "Analyzing temporal variations of AGN emission line profiles in the context of (dusty) cloud structure formation in the broad line region." Astronomy & Astrophysics 621 (January 2019): A46. http://dx.doi.org/10.1051/0004-6361/201834291.

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The formation processes and the exact appearance of the dust torus and broad line region (BLR) of active galactic nuclei (AGN) are under debate. Theoretical studies show a possible connection between the dust torus and BLR through a common origin in the accretion disk. However observationally the dust torus and BLR are typically studied separately. NGC 4151 is possibly one of the best suited Seyfert 1 galaxies for simultaneous examinations because of its high number of both photometric and spectroscopic observations in the past. Here we compare changes of the dust radius to shape variations of

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Risaliti, Guido. "The Structure of AGNs from X-Ray Absorption Variability." Proceedings of the International Astronomical Union 5, S267 (August 2009): 299–306. http://dx.doi.org/10.1017/s1743921310006514.

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AbstractWe present new evidence of X-ray absorption variability on time scales from a few hours to a few days for several nearby bright AGNs. The observed NH variations imply that the X-ray absorber is made of clouds eclipsing the X-ray source with velocities in excess of 103 km s−1, and densities, sizes and distances from the central black hole typical of BLR clouds. We conclude that the variable X-ray absorption is due to the same clouds emitting the broad emission lines in the optical/UV. We then concentrate on the two highest signal-to-noise spectra of eclipses, discovered in two long obse

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Panda, Swayamtrupta, Paola Marziani, and Bożena Czerny. "Feii emission in NLS1s – originating from denser regions with higher abundances?" Proceedings of the International Astronomical Union 15, S356 (October 2019): 77–81. http://dx.doi.org/10.1017/s1743921320002616.

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AbstractThe interpretation of the main sequence of quasars has become a frontier subject in the last years. This considers the effect of a highly flattened, axially symmetric geometry for the broad line region (BLR) on the parameters related to the distribution of quasars along their main sequence. We utilize the photoionization code CLOUDY to model the BLR, assuming ‘un-constant’ virial factor with a strong dependence on the viewing angle. We show the preliminary results of the analysis to highlight the co-dependence of the Eigenvector 1 parameter, RFeii on the broad Hβ FWHM (i.e. the line di

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Luk, Abbie Sheung-Wan, Jason Cheuk-Sing Yam, Henry Hing-Wai Lau, Wilson Wai-Kuen Yip, and Alvin Lerrmann Young. "Surgical Outcome of Medial Rectus Resection in Recurrent Exotropia: A Novel Surgical Formula." Journal of Ophthalmology 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/758463.

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Purpose. To evaluate the surgical outcomes of unilateral or bilateral medial rectus (MR) muscle resection for recurrent exotropia after bilateral lateral rectus (BLR) muscle recession based on a novel surgical formula.Methods. Forty-one consecutive patients with unilateral or bilateral MR muscle resection for recurrent exotropia after BLR muscle recession were included in this retrospective study. All surgeries were performed according to the formula: 1.0 mm MR muscle resection for every 5 prism dioptres (PD) of exotropia, with an addition of 0.5 mm to each MR muscle operated on.Results. The m

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COLE, JOSHUA A., and STEPHEN G. SIMPSON. "MASS PROBLEMS AND HYPERARITHMETICITY." Journal of Mathematical Logic 07, no. 02 (December 2007): 125–43. http://dx.doi.org/10.1142/s0219061307000652.

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A mass problem is a set of Turing oracles. If P and Q are mass problems, we say that P is weakly reducible to Q if for all Y ∈ Q there exists X ∈ P such that X is Turing reducible to Y. A weak degree is an equivalence class of mass problems under mutual weak reducibility. Let [Formula: see text] be the lattice of weak degrees of mass problems associated with nonempty [Formula: see text] subsets of the Cantor space. The lattice [Formula: see text] has been studied in previous publications. The purpose of this paper is to show that [Formula: see text] partakes of hyperarithmeticity. We exhibit a

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del Palacio, S., V. Bosch-Ramon, and G. E. Romero. "Gamma rays from jets interacting with BLR clouds in blazars." Astronomy & Astrophysics 623 (March 2019): A101. http://dx.doi.org/10.1051/0004-6361/201834231.

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Context. The innermost parts of powerful jets in active galactic nuclei are surrounded by dense, high-velocity clouds from the broad-line region, which may penetrate into the jet and lead to the formation of a strong shock. Such jet-cloud interactions are expected to have measurable effects on the γ-ray emission from blazars. Aims. We characterise the dynamics of a typical cloud-jet interaction scenario, and the evolution of its radiative output in the 0.1–30 GeV energy range, to assess to what extent these interactions can contribute to the γ-ray emission in blazars. Methods. We use semi-anal

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Rodríguez-Pascual, P. M. "IUE Monitoring of the Bright Seyfert 1 Galaxy Fairall 9." International Astronomical Union Colloquium 159 (1997): 167–68. http://dx.doi.org/10.1017/s0252921100039907.

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AbstractAn eight-month spectrscopic monitoring campaign on the Seyfert 1 galaxy Fairall 9 has been carried out with the International Ultraviolet Explorer (IUE) in order to measure continuum-continuum and continuum-emission-line delays for a high-luminosity active galactic nucleus (AGN). The results are consistent with those of previous campaigns on lower luminosity AGNs: (i) there is no measurable time lag between different ultraviolet continuum bands, (ii) the measured time lags for the emission lines are relatively short, and (iii) the more rapid and stronger response to continuum changes o

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Robertson, K. A., E. S. Colvin, M. R. Kelley, and M. L. Fishel. "APX3330 inhibition of the redox function of ape-1/ref-1 (Ref-1) in promyelocytic leukemia cells enhances retinoic acid (ATRA) induced myeloid differentiation and limits cell proliferation as an approach to the prevention of the retinoic acid syndrome (RAS)." Journal of Clinical Oncology 27, no. 15_suppl (May 20, 2009): e14613-e14613. http://dx.doi.org/10.1200/jco.2009.27.15_suppl.e14613.

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e14613 Background: ATRA + chemotherapy has improved the treatment of promyelocytic leukemia(APL). However, 25% of ATRA treated APL patients experience toxicities that comprise the RAS (life-threatening respiratory distress, edema, renal failure, hypotension, coagulopathy and rising blast count). One approach to prevent RAS is to limit blast proliferation and enhance myeloid differentiation. Ref-1 is a DNA repair protein that functions in redox regulation of cellular proteins, such as Fos, Jun, p53, and NFkB. HL60 myeloid leukemia cells are promyeloblasts that respond to ATRA with granulocytic

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Doddamani, Vijayakumar H., and P. Vedavathi. "Ultraviolet Line-Continuum properties of Seyfert 1 galaxies and quasars." Proceedings of the International Astronomical Union 9, S304 (October 2013): 233–35. http://dx.doi.org/10.1017/s1743921314003883.

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AbstractActive galaxies are most luminous objects in the universe whose spectra are characterized by both permitted and forbidden emission line features. The spectra of Seyfert 1 galaxies and quasars contain strong and broad emission lines of wide ranging ionization potentials. The velocity widths of the lines range from a minimum of ≈ 500 km/s for narrow lines to a maximum of 20,000 km/sec for broad lines. The UV spectra of the active galaxies contain strong and broad emission lines such as Lyα, NV, SiIV, OIV], CIV, CIII] and MgII lines. The widths of the broad lines are attributed to the dif

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Kartje, John F., Arieh Königl, and Moshe Elitzur. "Water Maser Emission from Dusty Clouds in AGNs." International Astronomical Union Colloquium 163 (1997): 738–39. http://dx.doi.org/10.1017/s0252921100043712.

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AbstractA natural site for water maser emission in AGNs is provided by dusty gas with properties characteristic of broad line region (BLR) clouds. Radiation shielding by dust in the clouds is critical for allowing molecular gas to exist ≤ 1 pc from the central engine. Thus, the innermost radius at which such masers appear should correspond to the grain sublimation radius rsub. We suggest a dynamical model in which the masing clouds are embedded within a magnetized accretion disk wind.

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Denney, Kelly D., B. M. Peterson, R. W. Pogge, M. C. Bentz, C. M. Gaskell, T. Minezaki, C. A. Onken, S. G. Sergeev, and M. Vestergaard. "Reverberation Mapping Results from MDM Observatory." Proceedings of the International Astronomical Union 5, S267 (August 2009): 201. http://dx.doi.org/10.1017/s1743921310006216.

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Reverberation mapping takes advantage of the presence of a time delay or lag, τ, between continuum and emission line flux variations observed through spectroscopic monitoring campaigns to infer the radius of the broad-line region (BLR) and, subsequently, the central black hole mass in type 1 AGNs. We present results from a multi-month reverberation mapping campaign undertaken primarily at MDM Observatory with supporting observations from around the world. We measure BLR radii and black hole masses for six objects. The primary goal of this campaign was to obtain either new or improved Hβ reverb

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