gebhart/patrepeval huggingface dataset:
Plant resistance towards insect herbivores: a dynamic interaction (2002)

Plant defences against insect herbivores can be divided into 'static' or constitutive defences, and 'active' or induced defences, although the insecticidal compounds or proteins involved are often the same. Induced defences have aspects common to all plants, whereas the accumulation of constitutive defences is species-specific. Insect herbivores activate induced defences both locally and systemically by signalling pathways involving systemin, jasmonate, oligogalacturonic acid and hydrogen peroxide. Plants also respond to insect attack by producing volatiles, which can be used to deter herbivores, to communicate between parts of the plant, or between plants, to induce defence responses. Plant volatiles are also an important component in indirect defence. Herbivorous insects have adapted to tolerate plant defences, and such adaptations can also be constitutive or induced. Insects whose plant host range is limited are more likely to show constitutive adaptation to the insecticidal compounds they will encounter, whereas insects which feed on a wide range of plant species often use induced adaptations to overcome plant defences. Both plant defence and insect adaptation involve a metabolic cost, and in a natural system most plant-insect interactions involving herbivory reach a 'stand-off' where both host and herbivore survive but develop suboptimally. Contents Summary 145 I. Introduction 146 II. Accumulation of defensive compounds and induced resistance 146 III. Signalling pathways in wound-induced resistance 147 IV. Insect modulation of the wounding response 155 V. Insects which evade the wounding response 156 VI. Insect-induced emission of volatiles and tritrophic interactions 157 VII. Insect adaptation to plant defences 160 Conclusions 163 Acknowlegements 163 References 163.
Identification of critical nucleotide positions for plastid RNA editing site recognition. (1997)

Transcripts in higher plant cell organelles undergo RNA editing by C-to-U conversion. Both the mechanistic steps and the factors involved in this process are largely unknown. To gain a better understanding of the molecular interactions involved in organellar RNA editing, we have begun to identify critical nucleotide positions for plastid RNA editing-site recognition. We performed a scanning point mutagenesis on a sequence motif separating editing sites IV and V in the tobacco ndhB transcript. The constructs were integrated into the chloroplast genome by the biolistic process and the effect of each point mutation on editing of both the upstream and the downstream site was measured. In addition to a previously identified sequence element located upstream of both sites, only few nucleotide positions 5' and 3' of an editing site turned out to be of critical importance. Unexpectedly, our study revealed that mutation of the upstream site leads to loss of editing at the downstream site. However, our results also indicate that, even though closely adjacent editing sites can share common recognition elements in cis, they are edited independently and not in a polar fashion.
Handbook of Medicinal Herbs (2002)

Still considered the definitive work on medicinal herbs and their uses after two decades, the Handbook of Medicinal Herbs has undergone a long-anticipated revision. In the second edition, world-renowned ethnobotanist James A. Duke provides up-to-date data on over 800 of the world's most important medicinal plant species. The book contains mo
The ancient CYP716 family is a major contributor to the diversification of eudicot triterpenoid biosynthesis (2017)

Triterpenoids are widespread bioactive plant defence compounds with potential use as pharmaceuticals, pesticides and other high-value products. Enzymes belonging to the cytochrome P450 family have an essential role in creating the immense structural diversity of triterpenoids across the plant kingdom. However, for many triterpenoid oxidation reactions, the corresponding enzyme remains unknown. Here we characterize CYP716 enzymes from different medicinal plant species by heterologous expression in engineered yeasts and report ten hitherto unreported triterpenoid oxidation activities, including a cyclization reaction, leading to a triterpenoid lactone. Kingdom-wide phylogenetic analysis of over 400 CYP716s from over 200 plant species reveals details of their evolution and suggests that in eudicots the CYP716s evolved specifically towards triterpenoid biosynthesis. Our findings underscore the great potential of CYP716s as a source for generating triterpenoid structural diversity and expand the toolbox available for synthetic biology programmes for sustainable production of bioactive plant triterpenoids.
Potentiometric determination of halogen content in organic compounds using dispersed sodium reduction (1988)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotentiometric determination of halogen content in organic compounds using dispersed sodium reductionMargaret L. Ware, Mark D. Argentine, and Gary W. RiceCite this: Anal. Chem. 1988, 60, 4, 383–384Publication Date (Print):February 15, 1988Publication History Published online1 May 2002Published inissue 15 February 1988https://pubs.acs.org/doi/10.1021/ac00155a026https://doi.org/10.1021/ac00155a026research-articleACS PublicationsRequest reuse permissionsArticle Views80Altmetric-Citations6LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Abdominal aorta and renal artery stenosis: evaluation with MR angiography. (1990)

A blinded, prospective study with magnetic resonance (MR) angiography was performed to study patients who had undergone abdominal aortography. In 55 renal arteries among 25 patients, MR angiography had a sensitivity of 100% for detecting renal artery stenosis of 50% or greater and a specificity of 92%. With MR angiography, the degree of renal artery stenosis was overgraded in four of 55 renal arteries: Mild stenosis was overgraded as moderate stenosis in two arteries and as a severe stenosis in one, and a moderate stenosis was overgraded as a severe stenosis in one. The number of renal arteries was correctly determined in all cases. The renal arteries could be well evaluated only in the proximal third of the vessel, precluding detection of more distal stenoses. Atherosclerotic plaque uniformly appeared dark on gradient-echo images and was easily differentiated from bright, flowing blood in the aortic lumen. MR angiography enabled correct grading of the presence of atherosclerotic plaque and stenoses of the abdominal aorta in 22 of 25 patients (88%). The authors conclude that MR angiography has the potential to be a useful screening technique for patients with suspected renal artery stenosis and disorders of the abdominal aorta, but further clinical studies are warranted.
Peptidic α-Ketocarboxylic Acids and Sulfonamides as Inhibitors of Protein Tyrosine Phosphatases (2003)

One common approach for designing protein tyrosine phosphatase (PTPase) inhibitors is to incorporate a nonhydrolyzable phosphotyrosine (pTyr) mimic into a peptide substrate for PTPases. This report describes the synthesis of three such nonhydrolyzable pTyr mimics that contain alpha-ketoacid, alpha-hydroxyacid, and methylenesulfonamide functional groups in place of the phosphate. These pTyr mimics were incorporated into the peptide sequence Ac-Asp-Ala-Asp-Glu-X-Leu-NH(2), where X is the pTyr mimic, and analyzed for activity against the Yersinia PTPase and PTP1B.
The AstroVR Collaboratory, an On-line Multi-User Environment for Research in Astrophysics (1995)

Abstract. We describe our experiment with an on-line collaborative environment where users share the execution of programs and communicate via audio, video, and typed text. Collaborative environments represent the next step in computer-mediated conferencing, combining powerful compute engines, data persistence, shared applications, and teleconferencing tools. As proof of concept, we haveimplemented a shared image analysis tool, allowing geographically distinct users to analyze FITS images together. We anticipate that AstroVR1 and similar systems will become an important part of collaborative work in the next decade, with applications in remote observing, spacecraft operations, on-line meetings, and day-to-day research activities. The technology is generic and promises to nd uses in business, medicine, government, and education. 1.
Contribution of Abnormal Muscle and Liver Glucose Metabolism to Postprandial Hyperglycemia in NIDDM (1990)

To assess the role of muscle and liver in the pathogenesis of postprandial hyperglycemia in non-insulin-dependent diabetes mellitus (NIDDM), we administered an oral glucose load enriched with [14C]glucose to 10 NIDDM subjects and 10 age- and weight-matched nondiabetic volunteers and compared muscle glucose disposal by measuring forearm balance of glucose, lactate, alanine, O2, and CO2 (with forearm calorimetry). In addition, we used the dual-lable isotope method to compare overall rates of glucose appearance (Ra) and disappearance (Rd), suppression of endogenous glucose output, and splanchnic glucose sequestration. During the initial 1-1.5 h after glucose ingestion, plasma glucose increased by approximately 8 mM in NIDDM vs. approximately 3 mM in nondiabetic subjects (P less than 0.01); overall glucose Ra was nearly 11 g greater in NIDDM than nondiabetic subjects (45.1 +/- 2.3 vs. 34.4 +/- 1.5 g, P less than 0.01), but glucose Rd was not significantly different in NIDDM (35.1 +/- 2.4 g) and nondiabetic (33.3 +/- 2.7 g) subjects. The greater overall glucose Ra of NIDDM subjects was due to 6.8 g greater endogenous glucose output (13.7 +/- 1.1 vs. 6.8 +/- 1.0 g, P less than 0.01) and 3.8 g less oral glucose splanchnic sequestration of the oral load (31.4 +/- 1.5 vs. 27.5 +/- 0.9 g, P less than 0.05). Although glucose taken up by muscle was not significantly different in NIDDM and nondiabetic subjects (39.3 +/- 3.5 vs. 41.0 +/- 2.5 g/5 h), a greater amount of the glucose taken up by muscle in NIDDM was released as lactate and alanine (11.7 +/- 1.0 vs. 5.2 +/- 0.3 g in nondiabetic subjects, P less than 0.01), and less was stored (11.7 +/- 1.3 vs. 16.9 +/- 1.5 g, P less than 0.05). We conclude that increased systemic glucose delivery, due primarily to reduced suppression of endogenous hepatic glucose output and, to a lesser extent, reduced splanchnic glucose sequestration, is the predominant factor responsible for postprandial hyperglycemia in NIDDM.
A Case Study (2012)

We know that a nationwide shortage of highly qualified teachers exists, and not enough people are becoming teachers. We also know there are increasing demands for institutions to demonstrate a system of accountability through program assessment. As stated by the State Higher Education Executive Officers (2005), “The National Commission on Accountability in Higher Education believes improved accountability for better results is imperative, but how to improve accountability in higher education is not so obvious” (p. 4). Also, many teacher preparation programs are not accredited, and of the 1,300 teacher preparation programs that existed in 1999, only 38 percent were accredited through the National Council for the Accreditation of Teacher Education (NCATE) (The CEO Forum on Education & Technology, 2000, p. 3). While examining the effectiveness of the Teacher Education program assessment at the case institution, three convergent themes emerged.
Chemical Doping of Graphene Nanoribbon Field-Effect Devices (2008)

In this paper, the first air-stable n-type and p-type chemical doping in graphene via charge transfer have been demonstrated, and shown that the doping does not deteriorate the majority carrier mobility. The top-gated graphene structures have been further fabricated and demonstrated p-n junction in graphene nanoribbon (GNR) devices.
Influence of single and double deposition temperatures on the interface quality of atomic layer deposited Al2O3 dielectric thin films on silicon (2006)

An electrical characterization of Al2O3 based metal-insulator-semiconductor structures has been carried out by using capacitance-voltage, deep level transient spectroscopy, and conductance-transient (G-t) techniques. Dielectric films were atomic layer deposited (ALD) at temperatures ranging from 300 to 800 °C directly on silicon substrates and on an Al2O3 buffer layer that was grown in the same process by using 15 ALD cycles at 300 °C. As for single growth temperatures, 300 °C leads to the lowest density of states distributed away from the interface to the insulator [disorder-induced gap states (DIGS)], but to the highest interfacial state density (Dit). However, by using 300∕500°C double growth temperatures it is possible to maintain low DIGS values and to improve the interface quality in terms of Dit. The very first ALD cycles define the dielectric properties very near to the dielectric-semiconductor interface, and growing an upper layer at higher ALD temperature produces some annealing of interfacial states, thus improving the interface quality. Also, samples in which the only layer or the upper one was grown at the highest temperature (800 °C) show the poorest results both in terms of Dit and DIGS, so using very high temperatures yield defective dielectric films.
Farnesylcysteine analogues inhibit store-regulated Ca2+ entry in human platelets: evidence for involvement of small GTP-binding proteins and actin cytoskeleton (2000)

We have investigated the mechanism of Ca2+ entry into fura-2-loaded human platelets by preventing the prenylation of proteins such as small GTP-binding proteins. The farnesylcysteine analogues farnesylthioacetic acid (FTA) and N-acetyl-S-geranylgeranyl-L-cysteine (AGGC), which are inhibitors of the methylation of prenylated and geranylgeranylated proteins respectively, significantly decreased thrombin-evoked increases in intracellular free Ca2+ concentration ([Ca2+]i) in the presence, but not in the absence, of external Ca2+, suggesting a relatively selective inhibition of Ca2+ entry over internal release. Both these compounds and N-acetyl-S-farnesyl-L-cysteine, which had similar effects to those of FTA, also decreased Ca2+ entry evoked by the depletion of intracellular Ca2+ stores with thapsigargin. The inactive control N-acetyl-S-geranyl-L-cysteine was without effect. Patulin, an inhibitor of prenylation that is inert with respect to methyltransferases, also decreased store-regulated Ca2+ entry. Cytochalasin D, an inhibitor of actin polymerization, significantly decreased store-regulated Ca2+ entry in a time-dependent manner. Both cytochalasin D and the farnesylcysteine analogues FTA and AGGC inhibited actin polymerization; however, when evoking the same extent of decrease in actin filament formation, FTA and AGGC showed greater inhibitory effects on Ca2+ entry, indicating a cytoskeleton-independent component in the regulation of Ca2+ entry by small GTP-binding-protein. These findings suggest that prenylated proteins such as small GTP-binding proteins are involved in store-regulated Ca2+ entry through actin cytoskeleton-dependent and cytoskeleton-independent mechanisms in human platelets.
Synthesis of β-O-4-type artificial lignin polymers and their analysis by NMR spectroscopy (2008)

We describe the synthesis and NMR spectroscopic analysis of three artificial lignin polymers containing only the beta-O-4 substructure: syringyl-type homopolymer, p-hydroxyphenyl-type homopolymer and guaiacyl/syringyl-type heteropolymer. Using gel permeation chromatography, the weight-average degree of polymerization (DP(w)) of the three polymers was determined as 19.2, 38.6, and 13.9, respectively. The polymers were prepared based on the synthetic methodology of guaiacyl-type homopolymer, and were fully characterized using (1)H-, (13)C-, and (1)H-(13)C NMR spectroscopy of the acetylated and non-acetylated forms. The spectra of guaiacyl/syringyl-type heteropolymers were in good agreement with those of the beta-O-4 substructure of milled wood lignin obtained from the hardwood of Japanese white birch.
The lift force on a spherical body in a rotational flow (1987)

This paper concerns the flow about a sphere placed in a weak shear flow of an inviscid fluid. The secondary velocity resulting from advection of vorticity by the irrotational component of the flow is computed on the sphere surface, and on the upstream axis. The resulting lift force on the sphere is evaluated, and the result is confirmed by an analytical far-field calculation. The displacement of the stagnation streamline, far upstream of the sphere, is calculated more accurately than in previous papers.
Synthesis and Receptor Binding of New Thieno[2,3‐<i>d</i>]‐pyrimidines as Selective Ligands of 5‐HT<sub>3 </sub>Receptors (2008)

With the aim to develop new potent and selective ligands of 5-HT(3)-type serotonin receptors and to acquire more information on their structure-affinity relationships, new thieno[2,3-d]pyrimidine derivatives 32-39 were synthesized and their binding to 5-HT(3) versus 5-HT(4 )receptors was studied. Some of these new compounds exhibit good affinity for cortical 5-HT(3) receptors, but not for 5-HT(4) receptors. Among these derivatives, 6-ethyl-4-(4-methyl-1-piperazinyl)-2-(methylthio)thieno[2,3-d]pyrimidine 32 is the most potent ligand (K(i) = 67 nM); it behaves as a competitive antagonist of the 5-HT(3) receptor function in the guinea pig colon. Its binding interactions with 5-HT(3A )receptors were analysed by using receptor modelling and comparative docking.
Biofilms formed on catheter fragments surfaces observed by scanning electron microscope (SEM). (2015)

<p><i>S. epidermidis</i> strains WW06, ParlS, ParlRS and SE1457 were incubated with central vein catheter fragments in 96-well plates. After incubation at 37°C for 24 h, biofilm formed on the surface of the catheter fragments were observed under a transmission electron microscope (XL-30, Philips). Images were obtained at different magnifications (x3000, x10000) for biofilms formed by SE1457 (a, b), WW06 (c, d), ParlS (e, f) and ParlRS(g, h).</p>
Polarization in antennas and radar (1986)

An Introduction to Antennas. Representation of Wave Polarization. Polarization Matching of Antennas. Polarization Characteristics of Some Antennas. Generation of General Polarizations. Polarization Changes by Reflection and Transmission. Partial Polarization. Polarization Measurements. Appendixes.
SPAR: a planner that satisfies operational and geometric goals in uncertain environments (1990)

In this article, we present Spar (simultaneous planner for assembly robots), an implemented system that reasons about high-level operational goals, geometric goals, and uncertainty-reduction goals to create task plans for an assembly robot. These plans contain manipulations to achieve the assembly goals and sensory operations to cope with uncertainties in the robot's environment. High-level goals (which we refer to as operational goals) are satisfied by adding operations to the plan using a nonlinear, constraint-posting method. Geometric goals are satisfied by placing constraints on the execution of these operations. If the geometric configuration of the world prevents this, Spar adds new operations to the plan along with the necessary set of constraints on the execution of these operations. When the uncertainty in the world description exceeds that specified by the uncertainty-reduction goals, Spar introduces either sensing operations or manipulations to reduce this uncertainty to acceptable levels. If Spar cannot find a way to sufficiently reduce uncertainties, it augments the plan with sensing operations to be used to verify the execution of the action and, when possible, posts possible error-recovery plans, although at this point, the verification operations and recovery plans are predefined.
Christine Couture & Liliane Dionne (dir.). La formation et le développement professionnel des enseignants en sciences, technologie et mathématiques. Les Presses de l’Université d’Ottawa, 2010, 370 p. (2010)

Ce livre est une compilation de contributions, rassemblees par Christine Couture et Liliane Dionne et proposees par des chercheurs quebecois et francais. Et, une fois cela dit, j’ai l’impression d’etre parvenu au bout de ma competence de rapporteur tant la diversite de ces contributions est grande. On va, en effet, trouver des articles portant, bien sur, sur la formation des enseignants en mathematiques, biologie, physique ou de technologie avec des entrees traitant de la reflexion theorique ...
Sheath Dynamics and Characteristics in Radio-Frequency Atmospheric Pressure Glow Discharges (2005)

Summary form only given. Both experimental and computational studies have in the past established that the sheath region of radio-frequency atmospheric pressure glow discharges may be modeled, as the first approximation, by a capacitor. Experimentally the capacitance of the sheath region can be measured indirectly by measuring plasma reactance. In turn this can be used to deduce the sheath thickness. Since the sheath thickness is a function of electron temperature, electron density and sheath voltage, the measurement of the sheath thickness can potentially lead to routes to determine electron temperature, electron density or sheath voltage if one can establish their relationship. This contribution is an attempt to establish the generic dependence of sheath thickness on electron temperature, electron density and sheath voltage in radio-frequency atmospheric pressure glow discharges. Using a simulation tool that has been developed for radio-frequency atmospheric helium discharges; we studied sheath dynamics over a wide range of discharge currents from the low-current alpha mode to the high-current gamma mode. Sheath thickness is calculated and presented as a function of electron density, electron temperature and sheath voltage. To contrast out their generic correlations, we compared the numerically obtained dependence to the collisional sheath model of Child's law. Discussion is presented to establish (1) the possibility of a generic relationship and (2) the potential of using such relationship to develop new diagnostic methodologies
Alloreactive CD8 T Cell Tolerance Requires Recipient B Cells, Dendritic Cells, and MHC Class II (2008)

Allogeneic bone marrow chimerism induces robust systemic tolerance to donor alloantigens. Achievement of chimerism requires avoidance of marrow rejection by pre-existing CD4 and CD8 T cells, either of which can reject fully MHC-mismatched marrow. Both barriers are overcome with a minimal regimen involving anti-CD154 and low dose (3 Gy) total body irradiation, allowing achievement of mixed chimerism and tolerance in mice. CD4 cells are required to prevent marrow rejection by CD8 cells via a novel pathway, wherein recipient CD4 cells interacting with recipient class II MHC tolerize directly alloreactive CD8 cells. We demonstrate a critical role for recipient MHC class II, B cells, and dendritic cells in a pathway culminating in deletional tolerance of peripheral alloreactive CD8 cells.