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Articles 1831 - 1860 of 2397
Full-Text Articles in Entire DC Network
Shabangi Wants To Excite Young About Science, Aldemaro Romero Jr.
Shabangi Wants To Excite Young About Science, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Cuban Scientist Discusses Exchange With Siue, Aldemaro Romero Jr.
Cuban Scientist Discusses Exchange With Siue, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Reality Of Chemistry Is Far From Stereotypes, Aldemaro Romero Jr.
Reality Of Chemistry Is Far From Stereotypes, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Chemist Breaks With The Usual Stereotypes, Aldemaro Romero Jr.
Chemist Breaks With The Usual Stereotypes, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Assessing Continuous Contamination Discharge From A Combined Sewer Outfall (Cso) Into A Tidal Wetland Creek: Bacteriological And Heavy Metals Indicators, Timothy Eaton, Gregory D. O'Mullan, Ashaki A. Rouff
Assessing Continuous Contamination Discharge From A Combined Sewer Outfall (Cso) Into A Tidal Wetland Creek: Bacteriological And Heavy Metals Indicators, Timothy Eaton, Gregory D. O'Mullan, Ashaki A. Rouff
Publications and Research
Continuous discharge from a combined sewer overflow (CSO) into a tidal wetland creek in the New York City urban area was analyzed to assess the extent of water quality degradation from fecal bacteria contamination during both dry and wet weather. A combination of fecal indicator bacteria (FIB), total suspended solids, and dissolved metals were used to infer the presence of sewage pollution from the CSO discharge and to constrain the spatial and temporal impact on water quality and dry season creek flows. Upstream of the CSO, creek flow was dominated by groundwater input, and FIB levels were very low or …
Centerline Extraction For Image Segmentation Using Gradient And Direction Vector Flow Active Contours, Shuqun Zhang, Jianyang Zhou
Centerline Extraction For Image Segmentation Using Gradient And Direction Vector Flow Active Contours, Shuqun Zhang, Jianyang Zhou
Publications and Research
In this paper, we propose a fast centerline extraction method to be used for gradient and direction vector flow of active contours. The gradient and direction vector flow is a recently reported active contour model capable of significantly improving the image segmentation performance especially for complex object shape, by seamlessly integrating gradient vector flow and prior directional information. Since the prior directional information is provided by manual line drawing, it can be inconvenient for inexperienced users who might have difficulty in finding the best place to draw the directional lines to achieve the best segmentation performance. This paper describes a …
Developing A Community Of Practice Among Peer Leaders: The Leadership Seminar, A.E. Dreyfuss, Janet Liou-Mark, Amelise Bonhomme, Travion Joseph
Developing A Community Of Practice Among Peer Leaders: The Leadership Seminar, A.E. Dreyfuss, Janet Liou-Mark, Amelise Bonhomme, Travion Joseph
Publications and Research
The Leadership Seminar, piloted in the fall semester of 2011, is a mandatory weekly meeting for Peer Leaders at New York City College of Technology, City University of New York (CUNY). Its main purpose was to create a community of practice among first-time and experienced Peer Leaders. Continued in the spring 2012 semester, the one hour session provides a setting where Peer Leaders can share their experiences, discuss problems that arise in their workshops, and further develop their leadership and professional skills
A History Of Peer-Led Team Learning, 1990-2012, A.E. Dreyfuss
A History Of Peer-Led Team Learning, 1990-2012, A.E. Dreyfuss
Publications and Research
From Workshop Chemistry in 1991 at the City College of New York, CUNY, to implementation in other disciplines and development of Peer-Led Team Learning and its Six Critical Components, this paper reviews the contributions of faculty at a variety of higher education institutions to the dissemination and growth of PLTL as a successful model of student engagement with the position of the student Peer Leader.
The Role Of Video In Early Field Experiences, Laura H. Baecher, Shiao-Chuan Kung, Abigail M. Jewkes, Christine Rosalia
The Role Of Video In Early Field Experiences, Laura H. Baecher, Shiao-Chuan Kung, Abigail M. Jewkes, Christine Rosalia
Publications and Research
The purpose of this investigation was to explore the influence of video models on teacher candidates' capacity to self-evaluate their teaching performance in early fieldwork. This was examined by providing video models along with evaluation rubrics that represented desired performance standard to one group of pre-service teacher candidates, while another group was provided the descriptions of these lessons and corresponding evaluation rubrics. Participants then video recorded their teaching and self-evaluated this performance. Results indicated that the introduction of video models reduced inflation of scores in self-evaluation and enhanced candidates' understanding of the expectations for the performance assessment of teaching.
Out On The Land: Income, Subsistence Activities, And Food Sharing Networks In Nain, Labrador, Kirk Dombrowski, Emily Channell, Bilal Khan, Joshua Moses, Evan Misshula
Out On The Land: Income, Subsistence Activities, And Food Sharing Networks In Nain, Labrador, Kirk Dombrowski, Emily Channell, Bilal Khan, Joshua Moses, Evan Misshula
Publications and Research
In recent Inuit ethnography, a major concern has been how and to what extent contemporary Inuit participate in and depend on subsistence activities, particularly in the context of increasing wage employment and growing participation in the cash economy. This paper provides an analysis of these activities in the predominately Inuit community of Nain, Labrador. Using social network data and demographic information collected between January and June 2010, we examine the interconnections between subsistence activities—obtaining “country food” through activities such as hunting, fishing, and collecting—with access to the means of obtaining subsistence resources (such as snow mobiles, cabins, and boats), employment …
Language, Politics, And History: An Introductory Essay, José Del Valle
Language, Politics, And History: An Introductory Essay, José Del Valle
Publications and Research
This book chapter examines different articulations of language and history and introduces a new configuration that focuses on the political dimension of language.
Comment On "Density And Physical Current Density Functional Theory", Xiao-Yin Pan, Viraht Sahni
Comment On "Density And Physical Current Density Functional Theory", Xiao-Yin Pan, Viraht Sahni
Publications and Research
In this letter to the editor, the authors comment on an earlier article they had published, "Density and Physical Current Density Functional Theory" (Pan, X.-Y. and Sahni, V. (2010), Density and physical current density functional theory. Int. J. Quantum Chem., 110: 2833–2843. doi: 10.1002/qua.22862).
Nous And Aisthēsis: Two Cognitive Faculties In Aristotle, Adriana Renero
Nous And Aisthēsis: Two Cognitive Faculties In Aristotle, Adriana Renero
Publications and Research
In disagreement with Claudia Baracchi's controversial thesis that there is a 'simultaneity and indissolubility' if not an 'identity' of intelligence (nous) and perception (aisthēsis) at the core of Aristotle's philosophy, I will argue that Aristotle maintains a fundamental distinction between these cognitive faculties. My goal in this paper is to examine specific parts of two central and complex passages, VI.8, 1142al2-30 and VI. 11, 1143a33-bl5, from the Nicomachean Ethics to show that Baracchi's view is unpersuasive. I will show that Aristotle considers nous to be a different capacity than mere perception and one through which particulars …
Information Content Of Seasonal Forecasts In A Changing Climate, Nir Krakauer, Michael D. Grossberg, Irina Gladkova, Hannah Aizenman
Information Content Of Seasonal Forecasts In A Changing Climate, Nir Krakauer, Michael D. Grossberg, Irina Gladkova, Hannah Aizenman
Publications and Research
We study the potential value to stakeholders of probabilistic long-term forecasts, as quantified by the mean information gain of the forecast compared to climatology. We use as a case study the USA Climate Prediction Center (CPC) forecasts of 3-month temperature and precipitation anomalies made at 0.5-month lead time since 1995. Mean information gain was positive but low (about 2% and 0.5% of the maximum possible for temperature and precipitation forecasts, resp.) and has not increased over time. Information-based skill scores showed similar patterns to other, non-information-based, skill scores commonly used for evaluating seasonal forecasts but tended to be smaller, suggesting …
Role Of Epidermal Growth Factor-Triggered Pi3k/Akt Signaling In The Migration Of Medulloblastoma-Derived Cells, Veronica Dudu, Richard A. Able, Jr., Veronica Rotari, Qingjun Kong, Maribel Vazquez
Role Of Epidermal Growth Factor-Triggered Pi3k/Akt Signaling In The Migration Of Medulloblastoma-Derived Cells, Veronica Dudu, Richard A. Able, Jr., Veronica Rotari, Qingjun Kong, Maribel Vazquez
Publications and Research
Medulloblastoma (MB) is the most common brain cancer diagnosed among children. The cellular pathways that regulate MB invasion in response to environmental cues remain incompletely understood. Herein, we examine the migratory response of human MB-derived Daoy cells to different concentration profiles of Epidermal Growth Factor (EGF) using a microfluidic system. Our findings provide the first quantitative evidence that EGF concentration gradients modulate the chemotaxis of MB-derived cells in a dose-dependent manner via the EGF receptor (EGF-R). Data illustrates that higher concentration gradients caused increased number of cells to migrate. In addition, our results show that EGF-induced receptor phosphorylation triggered the …
Species Shout-Outs From Abdul To Zebra: Encouraging Nonmajors To Communicate In The Biology Classroom, Christina P. Colon
Species Shout-Outs From Abdul To Zebra: Encouraging Nonmajors To Communicate In The Biology Classroom, Christina P. Colon
Publications and Research
No abstract provided.
Attack Rates Assessment Of The 2009 Pandemic H1n1 Influenza A In Children And Their Contacts: A Systematic Review And Meta-Analysis, Aharona Glatman-Freedman, Ian Portelli, Susan K. Jacobs, Justin I. Mathew, Jonathan E. Slutzman, Lewis R. Goldfrank, Silas W. Smith
Attack Rates Assessment Of The 2009 Pandemic H1n1 Influenza A In Children And Their Contacts: A Systematic Review And Meta-Analysis, Aharona Glatman-Freedman, Ian Portelli, Susan K. Jacobs, Justin I. Mathew, Jonathan E. Slutzman, Lewis R. Goldfrank, Silas W. Smith
Publications and Research
Background The recent H1N1 influenza A pandemic was marked by multiple reports of illness and hospitalization in children, suggesting that children may have played a major role in the propagation of the virus. A comprehensive detailed analysis of the attack rates among children as compared with their contacts in various settings is of great importance for understanding their unique role in influenza pandemics. Methodology/Principal Findings We searched MEDLINE (PubMed) and Embase for published studies reporting outbreak investigations with direct measurements of attack rates of the 2009 pandemic H1N1 influenza A among children, and quantified how these compare with those of …
What Can Phages Tell Us About Host-Pathogen Coevolution?, John J. Dennehy
What Can Phages Tell Us About Host-Pathogen Coevolution?, John J. Dennehy
Publications and Research
The outcomes of host-parasite interactions depend on the coevolutionary forces acting upon them, but because every host-parasite relation is enmeshed in a web of biotic and abiotic interactions across a heterogeneous landscape, host-parasite coevolution has proven difficult to study. Simple laboratory phage-bacteria microcosms can ameliorate this difficulty by allowing controlled, well-replicated experiments with a limited number of interactors. Genetic, population, and life history data obtained from these studies permit a closer examination of the fundamental correlates of host-parasite coevolution. In this paper, I describe the results of phage-bacteria coevolutionary studies and their implications for the study of host-parasite coevolution. Recent …
What Studios Do, Eliot Bates
What Studios Do, Eliot Bates
Publications and Research
This essay is focused around a seemingly simple question – what do recording studios do? First, a clarification. I am not primarily asking “what are studios” or “what do people do in studios,” two comparatively straightforward questions that are tangentially addressed in academic and trade writing. Rather, I wish to consider some of the ways in which the studio itself shapes the kinds of social and musical performances and interactions that transpire within. I contend that studios must be understood simultaneously as acoustic environments, as meeting places, as container technologies, as a system of constraints on vision, sound and mobility, …
Two-Photon Time-Lapse Microscopy Of Bodipy-Cholesterol Reveals Anomalous Sterol Diffusion In Chinese Hamster Ovary Cells, Frederik W. Lund, Michael A. Lomholt, Lukasz M. Solanko, Robert Bittman, Daniel Wüstner
Two-Photon Time-Lapse Microscopy Of Bodipy-Cholesterol Reveals Anomalous Sterol Diffusion In Chinese Hamster Ovary Cells, Frederik W. Lund, Michael A. Lomholt, Lukasz M. Solanko, Robert Bittman, Daniel Wüstner
Publications and Research
Background Cholesterol is an important membrane component, but our knowledge about its transport in cells is sparse. Previous imaging studies using dehydroergosterol (DHE), an intrinsically fluorescent sterol from yeast, have established that vesicular and non-vesicular transport modes contribute to sterol trafficking from the plasma membrane. Significant photobleaching, however, limits the possibilities for in-depth analysis of sterol dynamics using DHE. Co-trafficking studies with DHE and the recently introduced fluorescent cholesterol analog BODIPY-cholesterol (BChol) suggested that the latter probe has utility for prolonged live-cell imaging of sterol transport. Results We found that BChol is very photostable under two-photon (2P)-excitation allowing the acquisition …
Development Of A Ground Based Remote Sensing Approach For Direct Evaluation Of Aerosol-Cloud Interaction, Bomidi Lakshmi Madhavan, Yuzhe He, Yonghua Wu, Barry Gross, Fred Moshary, Samir Ahmed
Development Of A Ground Based Remote Sensing Approach For Direct Evaluation Of Aerosol-Cloud Interaction, Bomidi Lakshmi Madhavan, Yuzhe He, Yonghua Wu, Barry Gross, Fred Moshary, Samir Ahmed
Publications and Research
The possible interaction and modification of cloud properties due to aerosols is one of the most poorly understood mechanisms within climate studies, resulting in the most significant uncertainty as regards radiation budgeting. In this study, we explore direct ground based remote sensing methods to assess the Aerosol-Cloud Indirect Effect directly, as space-borne retrievals are not directly suitable for simultaneous aerosol/cloud retrievals. To illustrate some of these difficulties, a statistical assessment of existing multispectral imagers on geostationary (e.g., GOES)/Moderate Resolution Imaging Spectroradiometer (MODIS) satellite retrievals of the Cloud Droplet Effective Radius (Reff) showed significant biases especially at larger solar zenith angles, …
Protein P7 Of The Cystovirus Φ6 Is Located At The Three-Fold Axis Of The Unexpanded Procapsid, Garrett Katz, Hui Wei, Alexandra Alimova, Al Katz, David Gene Morgan, Paul Gottlieb
Protein P7 Of The Cystovirus Φ6 Is Located At The Three-Fold Axis Of The Unexpanded Procapsid, Garrett Katz, Hui Wei, Alexandra Alimova, Al Katz, David Gene Morgan, Paul Gottlieb
Publications and Research
The objective of this study was to determine the location of protein P7, the RNA packaging factor, in the procapsid of the φ6 cystovirus. A comparison of cryo-electron microscopy high-resolution single particle reconstructions of the φ6 complete unexpanded procapsid, the protein P2-minus procapsid (P2 is the RNA directed RNA-polymerase), and the P7-minus procapsid, show that prior to RNA packaging the P7 protein is located near the three-fold axis of symmetry. Difference maps highlight the precise position of P7 and demonstrate that in P7-minus particles the P2 proteins are less localized with reduced densities at the three-fold axes. We propose that …
Quantum Learning Without Quantum Memory, G. Sentís, J. Calsamiglia, R. Muñoz-Tapia, E. Bagan
Quantum Learning Without Quantum Memory, G. Sentís, J. Calsamiglia, R. Muñoz-Tapia, E. Bagan
Publications and Research
A quantum learning machine for binary classification of qubit states that does not require quantum memory is introduced and shown to perform with the minimum error rate allowed by quantum mechanics for any size of the training set. This result is shown to be robust under (an arbitrary amount of) noise and under (statistical) variations in the composition of the training set, provided it is large enough. This machine can be used an arbitrary number of times without retraining. Its required classical memory grows only logarithmically with the number of training qubits, while its excess risk decreases as the inverse …
Tectonics And Sedimentary Facies Interpretation Of The Mesozoic Giron Group, Colombia, Hernando Martinez-Sacristan, Ricardo Mier-Umana, Nazrul I. Khandaker, Stanley Schleifer, Diana Lucia Leon-Martinez
Tectonics And Sedimentary Facies Interpretation Of The Mesozoic Giron Group, Colombia, Hernando Martinez-Sacristan, Ricardo Mier-Umana, Nazrul I. Khandaker, Stanley Schleifer, Diana Lucia Leon-Martinez
Publications and Research
Preliminary field investigations involving exposed Giron Group sediments in Colombia provided some interesting geologic information in terms of provenance, depositional environments, and development of the Mesozoic synrift sedimentary basins in Colombia. Overall, the synrift Triassic-Jurassic rift-related volcanic rocks, redbeds, and evaporites are prominent in Colombia, and a thick basin sequence of Cretaceous sandstones and shales dominates the central part of the Cordillera Oriental. These were mostly deposited in dominantly north-trending grabens. Identified sedimentary rock types were arkose, clast-and-matrix-supported conglomerate, red mudstone, variegated sandstone, siltstone and breccia. Extensive kaolinitization was noticeable in several sandstone samples. Among the notable sedimentary structures were …
Hohenberg-Kohn Theorem Including Electron Spin, Xiao-Yin Pan, Viraht Sahni
Hohenberg-Kohn Theorem Including Electron Spin, Xiao-Yin Pan, Viraht Sahni
Publications and Research
The Hohenberg-Kohn theorem is generalized to the case of a finite system of N electrons in external electrostatic epsilon(r) = -del nu(r) and magnetostatic B(r) = del x A(r) fields in which the interaction of the latter with both the orbital and spin angular momentum is considered. For a nondegenerate ground state a bijective relationship is proved between the gauge invariant density rho(r) and physical current density j(r) and the potentials {nu(r), A(r)}. The possible many-to-one relationship between the potentials {v(r), A(r)} and the wave function is explicitly accounted for in the proof. With the knowledge that the basic variables …
Central Park East Secondary School: Teaching And Learning Through Freire, Alia R. Tyner-Mullings
Central Park East Secondary School: Teaching And Learning Through Freire, Alia R. Tyner-Mullings
Publications and Research
No abstract provided.
The Quantum Effective Action, Wave Functions And Yang-Mills(2+1), V. Parameswaran Nair
The Quantum Effective Action, Wave Functions And Yang-Mills(2+1), V. Parameswaran Nair
Publications and Research
No abstract provided.
Competition Between Conjugation And M13 Phage Infection In Escherichia Coli In The Absence Of Selection Pressure: A Kinetic Study, Zhenmao Wan, Noel L. Goddard
Competition Between Conjugation And M13 Phage Infection In Escherichia Coli In The Absence Of Selection Pressure: A Kinetic Study, Zhenmao Wan, Noel L. Goddard
Publications and Research
Inter- and intraspecies horizontal gene transfer enabled by bacterial secretion systems is a powerful mechanism for bacterial genome plasticity. The type IV secretion system of Escherichia coli, encoded by the F plasmid, enables cell-to-cell contact and subsequent DNA transfer known as conjugation. Conjugation is compromised by phage infection that specifically targets the secretion machinery. Hence, the use of phages to regulate the spread of genes, such as acquired antibiotic resistance or as general biosanitation agents, has gained interest. To predict the potential efficacy, the competition kinetics must first be understood. Using quantitative PCR to enumerate genomic loci in a resource-limited …
Empirical Evaluation Of Scoring Functions For Bayesian Network Model Selection, Zhifa Liu, Brandon Malone, Changhe Yuan
Empirical Evaluation Of Scoring Functions For Bayesian Network Model Selection, Zhifa Liu, Brandon Malone, Changhe Yuan
Publications and Research
In this work, we empirically evaluate the capability of various scoring functions of Bayesian networks for recovering true underlying structures. Similar investigations have been carried out before, but they typically relied on approximate learning algorithms to learn the network structures. The suboptimal structures found by the approximation methods have unknown quality and may affect the reliability of their conclusions. Our study uses an optimal algorithm to learn Bayesian network structures from datasets generated from a set of gold standard Bayesian networks. Because all optimal algorithms always learn equivalent networks, this ensures that only the choice of scoring function affects the …
Pricing Options On Foreign Currency With A Preset Exchange Rate, Avner Wolf, Christopher Heseel
Pricing Options On Foreign Currency With A Preset Exchange Rate, Avner Wolf, Christopher Heseel
Publications and Research
This paper presents a new option that can be used by agents for managing foreign exchange risk. Unlike the Garman Kolhagen model [1], (GK), this paper presents a new model with a preset exchange rate (PE), that allows the agent to take advantage of the his/her view on both the direction and magnitude of rate movement and as such provides this agent with more choices. The model has a provision for an automatic exchange of the payoff at a preset exchange rate, and upon expiration gives the agent the choice of keeping the payoff in the foreign currency or exchanging …