170,139 research outputs found
Mechanisms of septal lamination in the developing hippocampus analyzed by outgrowth of fibers from septal implants. II. Absence of guidance by degenerative debris
No full textIn previous study (Lewis, E.R., and C. W. Cotman (1980) Brain Res. 96: 307--330; E. R. Lewis and C. W. Cotman, submitted for publication), we have shown that septal tissues grafted to the brain of a neonatal rat will extend fibers into special terminal laminae within the hippocampal formation of the recipient. As a consequence of the implantation surgery, neurons in the developing entorhinal cortex are ablated and it is possible that processes of implanted cells may be guided by degenerating afferent fibers in the host. In order to test this hypothesis, we have characterized the distribution of degeneration argyrophilia that results from the implant surgery and the time course of its removal and examined the growth of septal implants in a host brain devoid of observable degenerative debris. The pattern of degeneration argyrophilia shortly after the implantation surgery did not correspond to the pattern of implant-associated AChE staining in the host hippocampal formation. By 72 hr after surgery, the great majority of argyrophilic debris had been removed. Implants placed in a cavity created 72 hr after surgery demonstrated excellent viability and produced the typical pattern of AChE staining in the hippocampal formation of the host. This suggests that the presence of degenerating host axons is not necessary to guide the ingrowth of axons and establish septohippocampal laminated fields.</jats:p
Dietary assessment of Parkinson\u27s disease patients
No full textBolniki s parkinsonovo boleznijo (PB) se soočajo s težavami, povezanimi s prehrano, ki vplivajo na kakovost življenja. Namen raziskave je bil ovrednotiti vpliv prehranskega svetovanja na kakovost življenja bolnikov s PB. V okviru evropskega projekta PD_manager, so na Institutu »Jožef Stefan« razvili mobilno aplikacijo, s katero so bolniki fotografirali svoje obroke in tako ustvarjali svoj prehranski dnevnik. Sodelovalo je šest preiskovancev z idiopatsko parkinsonovo boleznijo. V večini so imeli težave s prekomerno telesno maso in zaprtostjo. Vsi preiskovanci so s prehrano zaužili premalo kalcija, vitamina E in večkrat nenasičenih maščobnih kislin, večina pa poleg teh še magnezija, vitamina C in folne kisline. Glede na enotedenske prehranske dnevnike, rezultate krvnih izvidov in vprašalnik o prehranskih navadah preiskovancev, smo sestavili individualna prehranska priporočila. Pred intervencijo s prehranskim svetovanjem in šest mesecev po podanih priporočilih smo izmerili sestavo telesa z napravo za bioimpedančno analizo, podali oceno za prehransko podhranjenost ter ocenili kakovost življenja s standardiziranim vprašalnikom za samooceno bolnikov s PB. Kakovost življenja se je izboljšala pri tretjini preiskovancev.Parkinson\u27s disease (PD) is associated with nutrition related problems which affect the quality of life. The goal of our research was to evaluate the impact of nutritional assessment on the quality of life of patients with PD. An Android application, developed by »Jožef Stefan« institute within PD_manager project enables patients to create food dairy by taking photos of their meals. Six patients with idiopathic Parkinson’s disease were included, most of whom encountered overweight and constipation problems. All participants had insufficient daily dietary intake of calcium, vitamin E and polyunsaturated fatty acids, most of them also did not reach reference values for magnesium, vitamin C and folate. According to results of one week food dairy, blood examination report and dietary habit questionnaire, personalized dietary recommendations were prepared. Before nutritional intervention, and six months after giving dietary recommendations, body composition was measured using bioimpedance analysis device, patients were screened for malnutrition and their quality of life was rated using Unified Parkinson’s disease rating scale. The quality of life improved in 33,3 % of participants
Beta-amyloid causes downregulation of calcineurin in neurons through induction of oxidative stress
No full textCalcineurin is an abundant cytosolic protein that is implicated in the modulation of glutamate release. Here we show that the expression level of this enzyme is reduced in primary neuronal cultures treated with beta-amyloid. Parallel experiments in ETNA cell lines expressing SOD1 suggested that the effect of beta-amyloid on calcineurin expression is mediated by oxidative stress. The relevance of the in vitro experiments was assessed by analysis of tissue from patients with Alzheimer's disease (AD) and tissue from two strains of transgenic mice that mimic aspects of AD. The tissue from the AD brains displayed a pronounced downregulation of calcineurin immunoreactivity in profiles that were negative for glial fibrillary acidic protein (GFAP). In the hippocampus of the transgenic animals (which were analyzed in an early stage of the disease) the downregulation of calcineurin was restricted to mossy fiber terminals. A downregulation of the presynaptic pool of calcineurin may contribute to the dysregulation of glutamate release that is considered a hallmark of AD
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
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
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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