170,843 research outputs found
Luticola minutissima M. Rybak, Peszek, Skoczylas & Ludwig 2022, sp. nov.
No full textLuticola minutissima M. Rybak, Peszek, Skoczylas & Ludwig, sp. nov. (Figs 1–46) Type:— BRAZIL. Rio de Janeiro: city of Rio de Janeiro, Alto da Boa Vista, 22°57’09’’S, 43°13’40’’W, Ł. Skoczylas, 29 March 2015 (holotype UPCB! slide UPCB96.149, Herbarium of the Departamento de Botânica da Universidade Federal do Paraná, Brazil, depicted in Fig. 19). Isotypes: slide 26943 at the Szczecin Diatom Collection hosted by the University of Szczecin (SZCZ); slide 2015/1/1 and cleaned material stored in the Diatom Collection of the Institute of Agricultural Sciences, Land Management and Environmental Protection at the University of Rzeszów. Description:— Valves elliptic-lanceolate to rhombic-lanceolate with narrowly rounded apices (Figs 1–37). Range of valve dimensions (n = 60): 5.2–16.8 μm long and 3.7–5.4 μm wide. Axial area linear, central area bow-tie shaped, bounded by 2–4 areolae. Elongated stigma present in the central area, located close to face valve margin (Figs 38, 40, 42). Internally, stigma with indistinct opening bordered with large, circular, and lipped structure (Fig. 43, 45, 46). Marginal channel evident in SEM (Fig. 46), not visible in LM. Raphe branches almost straight to slightly curved (Figs 1–37, 39–41). External proximal endings double curved, first deflected away from the stigma, next abruptly hooked at a 90-degree angle to the stigma side (Fig. 29–42). Distal raphe endings hooked towards the stigma side, continuing onto the valve mantle (Fig. 39–42). Striae radiate, 22–28 at 10 μm, composed of 3–4 rounded areolae. Internally, poroids on valve face occluded by hymens, forming a continuous strip on each stria (Fig. 44, 46). Valve mantle has a single row of round areolae (Fig. 30, 37). Etymology:— The species name minutissima (lat. –tiny, smallest) refers to the small size of the new species’ frustule. Similar species:— Luticola deniseae Wetzel, Van de Vijver & Ector (2010: 178), L. imbricata (W.Bock) Levkov, Metzeltin & Pavlov (2013: 134), L. minima Levkov, Metzeltin & Pavlov (2013: 157), L. neglecta Zidarova, Levkov & Van de Vijver and L. tujii Levkov, Metzeltin & Pavlov (2013: 243), (Table 2). Distribution and ecology:— The species was observed in terrestrial habitats (mosses and lichens overgrowing different substrates, i.e. a concrete wall and palm tree trunks), both in urban and forest areas. The species developed very rarely, in the form of individual valves in the samples. Together with Luticola minutissima sp. nov., the most frequent species in sample 2015/1 were Humidophila sp. (90.3%) and Achnanthes pseudoinflata M.Rybak, Peszek, Skoczylas, Ector & C.E.Wetzel (2020: 3) (7.4%), while in sample 2015/3 the most frequent were: Humidophila contenta (Grunow) Lowe, Kociolek, J.R.Johansen, Van de Vijver, Lange-Bertalot & Kopalová (2014: 357) (74.8%) and Luticola moreirae Straube, Tremarin & T.Ludwig (2017: 428) (17.9%). In sample 2015/2 no dominant species were designated, due to an extremely low number of valves (15–30 per slide). Additional observation of Luticola neglecta Zidarova, Levkov & Van de Vijver is presented (Figs 47–67). The observed valves (n = 30) correspond to the description in Zidarova et al. (2014, 2016) in most morphological features. Notwithstanding, some additional observations were made. The external shape of stigma in the mentioned papers is small and rounded, but from our observations, it also seems to be slightly elongated (Figs. 61, 63, 64). The internal valve view ultrastructure has not been described until now. The areolae of the valve face are occluded by hymenes, forming a continuous strip on each stria. A marginal channel is visible internally under SEM, and is occluded by hymen. Internal stigma opening is small and C-shaped.Published as part of Rybak, Mateusz, Peszek, Łukasz, Skoczylas, Łukasz & Ludwig, Thelma Alvim Veiga, 2022, A new small-celled diatom from Brazil - Luticola minutissima sp. nov., with comparison to the type of the Antarctic L. neglecta Zidarova, Levkov & Van de Vijver, pp. 287-294 in Phytotaxa 530 (3) on pages 288-291, DOI: 10.11646/phytotaxa.530.3.4, http://zenodo.org/record/583601
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Combined effect of ultrasound and vacuum impregnation for the modification of apple tissue enriched with aloe vera juice
No full textThe aim of the work was to investigate how ultrasonic (US) treatment impacts on the physical and chemical properties of vacuum-impregnated apples. Apple slices were subjected to vacuum impregnation (VI) in an Aloe vera juice solution without additional treatments, serving as the reference material. Alternatively, ultrasound (US) treatments, at frequencies of 25 or 45 kHz, and durations of 10, 20, or 30 min, were employed as a pre-treatments before the VI process. The use of US processing enabled a significant increase in the efficiency of VI, without influencing in a significant way the color of the VI samples. The VI process led to a reduction in the content of bioactive compounds, in particular vitamin C and TPC decreased by 34 and 32%, respectively. The use of US as a pre-treatment, in particular at 45 kHz for 20 or 30 min, led to a better preservation of these compounds (unchanged values for vitamin C and decrease by 23-26% for TPC in comparison to the fresh samples). Through cluster analysis encompassing all assessed properties, it was evident that US treatment was beneficial for the processing, however the application of appropriate parameters of US treatment (frequency and time) had an impact on achieving similar quality to VI samples. The ultrasound treatment before vacuum impregnation may be suitable, however, the specific processing parameters should be defined for the obtained high quality of the final product
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
A 0.12mm<sup>2</sup> Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C
No full text Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area (> 0.25 mm 2 ) and have lower operating temperatures (le 125 {circ} {C}) [2]-[4]. This work describes a 0.12mm 2 resistor-based sensor that uses a Wien-bridge (WB) filter to achieve 0.1 {circ} {C} (3 sigma) inaccuracy from - 40 {circ} {C} to 180 {circ} {C}. Compared to a state-of-the-art WB sensor [4], it occupies 6 × less area and achieves comparable relative accuracy over a 76% wider operating range. Session 10.3 Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
A ±25A Versatile Shunt-Based Current Sensor with 10kHz Bandwidth and ±0.25% Gain Error from -40°C to 85°C Using 2-Current Calibration
No full textAccurate current sensing is critical in many industrial applications, such as battery management and motor control. Precise shunt-based current sensors have been reported with gain errors of less than 1% over the industrial temperature range (-40°C to 85°C) [1]–[4]. However, since they are intended for coulomb counting, their bandwidth is limited to a few tens of Hz, making them unsuitable for battery impedance or motor-current sensing. This paper presents a current sensor with a wide (10kHz) bandwidth and a tunable temperature compensation scheme (TCS), which allows it to be flexibly used with different types of shunts while maintaining high accuracy. A low-cost room-temperature calibration scheme is proposed to optimize gain flatness over temperature by exploiting the shunt's self-heating at large currents. Over the industrial temperature range and a ±25A current range, it achieves state-of-the-art gain error (±0.25%) with both low-cost PCB and stable metal-alloy shunts.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
A study of the equilibrium and kinetics of urea binding by a biomimetic dinickel(II) complex
No full textThe equilibrium and kinetics of urea binding by model dinickel complexes have been studied, which is relevant to the activity of the urease enzyme. The pyrazolate-based, O2H3-bridged dinuclear nickel(II) complex [LNi2(OH)(H2O)](2+) (1) binds urea reversibly in organic solvents with the formation of an N,O-bridged. urea anion complex [LNi2[OC(NH2)NH)](2+) (2) and two water molecules. The equilibrium constant has been measured as 4.3(4) in acetone, 2.7(5) in acetonitrile, and 3(l) in methanol at 25 degreesC. Upon dissolving I in anhydrous methanol, the O2H3 bridge is substituted for an O2Me2H bridge to give [LNi2(OMe)(MeOH)](2+) (4),which has been crystallized as 4.(ClO4)(2) and characterized by X-ray diffraction. Both Ni-II ions in 4 are five-coordinate with geometries intermediate between square-pyramidal and trigonal-bipyramidal. The H atom in the Me2O2H bridging unit is located in an asymmetric position. The exchange of water and methanol ligands in complexes I and 4 is very fast in solution at 25 degreesC (k(obsd.) > 10(3) s(-1)). Binding of urea by complexes I and 4 are slower reactions (k(obsd.) approximate to 10(-1) to 10(1) s(-1) under the concentration conditions used) and can be monitored by stopped-flow techniques. Detailed kinetic studies indicate that binding of urea is a multi-step process. Steady-state intermediates of the tentative formula [LNi2(OR)(urea)(n)](2+) (n = 1, 2) are formed in fast preequilibrium with the starting complexes I (R = H) and 4 (H = Me), respectively. The bidentate N,O-coordination and deprotonation of an O-bound urea ligand constitute the overall rate-limiting step. The kinetic data suggest that both mono- and bis(urea) complexes participate in the formation of the chelate 2, and that the latter are substantially more reactive. The bis(urea) pathway was unexpected because only, one urea molecule is incorporated into the final product 2. Reactive intermediates [LNi2(OH)(urea)(n)](2+) are close analogs of the reactive intermediate of urease, which also has the hydroxide and urea ligands bound at a dinickel core. However, the reactivities of the intermediates are different. The hydroxide ligand in our model complex acts as a base towards urea, and the urea anion complex 2 is formed. In urease, the hydroxide ligand attacks urea as a nucleophile leading to the hydrolysis of urea. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003
An Article About Albertus C. Van Raalte, Author Unknown, Except for Parts Taken from an Article by Anna C. Post
No full textAn article about Albertus C. Van Raalte, author unknown, except for parts taken from an article by Anna C. Post. The author knew first generation persons in the Holland settlement and therefore, the article has some value.https://digitalcommons.hope.edu/vrp_1890s/1012/thumbnail.jp
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