bluuebunny/crossref_metadata_2025 huggingface dataset:
Thermal Behavior of Poly(lactic acid)-Nanocomposite Studied by Near-Infrared Imaging Based on Roundtrip Temperature Scan
Authors: Shinzawa Hideyuki , Nishida Masakazu , Tsuge Akira , Ishikawa Daitaro , Ozaki Yukihiro , Morita Shigeaki , Kanematsu Wataru
Published: February 2014

The thermal behavior of poly(lactic acid) (PLA) was studied by near-infrared imaging to provide a molecular-level understanding of the physical improvement caused by nanoclay dispersion. A set of PLA samples, each having different nanoclay dispersion, was prepared under varying sonication time. Crystallinity variation of the polymer interacting with the nanoclay particles was analyzed by a roundtrip temperature scan below the melting temperature. Namely, the samples underwent heating and then cooling in the opposite way during the spectral measurement. The discrepancy of the spectral feature between the heating and the cooling indicated the development of the hysteresis associated with the cold crystallization of the PLA lamellae. The generation of the spectral residuals revealed the inner working mechanism of how the polymer structure undergoes variation depending on the presence of the clay particles and their dispersions. The sonication brings substantial dispersion of the nanoclay over the polymer matrix. The nanoclay particles then induce the additional development of the crystalline structure due to the molecular interaction between the PLA and nanoclay arising from the presence of enormous surface area, which in turn induces variation of mechanical strength to the polymer.
Long-Pulsed Luminescence for the Measurement of Dissolved Oxygen
Authors: Fitzgerald Noel S. , Burgess Lloyd W. , Yang Jeffrey C.-Y. , Kim Prince J. , Jang Sei-Hum , Jen Alex K.-Y.
Published: February 2014

Thin-film luminescent sensors were used to measure dissolved oxygen in picoliter volumes for the purpose of monitoring single-cell oxygen consumption rates, and that work served as the motivation for the development of the method described here. A few different platinum porphyrin sensor materials were examined, with all measurements conducted microscopically. By employing convolution theory to understand observed responses, including an unexpected red luminescent emission from an optic, we developed a new, rapid method for the determination of exponential decay lifetime. This new method of long-pulsed luminescence offers substantially improved signal-to-noise ratios for detected signals as long as self-illumination sources are carefully controlled in the experimental set-up.
Carbon Swan Spectra Measurements following Breakdown of Nitro Compound Explosive Simulants
Authors: Witte Michael J. , Parigger Christian G. , Bullock Nathan A. , Merten Jonathan A. , Allen Susan D.
Published: February 2014

Our measurements of micro-plasma following laser-induced optical breakdown of nitro compound explosive simulants, here 3-nitrobenzoic acid, show well-developed molecular spectra during the first several hundreds of nanoseconds. Analysis of recorded carbon spectra is accomplished using accurate line strengths for the diatomic molecular Swan system. Presence of hydrogen-beta allows us to infer electron density in the plasma evolution. Computational challenges include accounting for background variation and appropriate modeling of hydrogen embedded in molecular spectra. Recorded and computed spectra agree nicely for time delays on the order of 1.6 μs from optical breakdown when using a single temperature for local thermodynamic equilibrium plasma.
Near-Infrared Spectral Image Analysis of Pork Marbling Based on Gabor Filter and Wide Line Detector Techniques
Authors: Huang Hui , Liu Li , Ngadi Michael O. , Gariépy Claude , Prasher Shiv O.
Published: February 2014

Marbling is an important quality attribute of pork. Detection of pork marbling usually involves subjective scoring, which raises the efficiency costs to the processor. In this study, the ability to predict pork marbling using near-infrared (NIR) hyperspectral imaging (900–1700 nm) and the proper image processing techniques were studied. Near-infrared images were collected from pork after marbling evaluation according to current standard chart from the National Pork Producers Council. Image analysis techniques—Gabor filter, wide line detector, and spectral averaging—were applied to extract texture, line, and spectral features, respectively, from NIR images of pork. Samples were grouped into calibration and validation sets. Wavelength selection was performed on calibration set by stepwise regression procedure. Prediction models of pork marbling scores were built using multiple linear regressions based on derivatives of mean spectra and line features at key wavelengths. The results showed that the derivatives of both texture and spectral features produced good results, with correlation coefficients of validation of 0.90 and 0.86, respectively, using wavelengths of 961, 1186, and 1220 nm. The results revealed the great potential of the Gabor filter for analyzing NIR images of pork for the effective and efficient objective evaluation of pork marbling.
First Direct Body Fat Content Measurement during Pregnancy Using Fourier Transform Near-Infrared Spectroscopy
Authors: Azizian Hormoz , Kramer John K.G. , Phillips Stuart M.
Published: February 2014

Currently, there are no direct and reliable methods to measure the body fat content of women during pregnancy. Estimates of fat accretion can significantly affect calculations of energy requirements. We report here the first direct measurement of determining the body fat content of two women during pregnancy using the Fourier transform near-infrared spectroscopy (FT-NIR) method. Fourier transform near-infrared spectroscopy was shown to provide comparable results to dual-energy X-ray absorptiometry and magnetic resonance imaging. These latter methods, even though very reliable to measure body fat levels, cannot be used to measure the body fat of women during pregnancy because of health concerns, while FT-NIR poses no health risk. The FT-NIR results showed the percent body fat remained relatively constant throughout pregnancy, but fat mass and fat free mass increased. Fat mass followed an S curve with a maximum increase between 15 to 25 weeks of gestation that was only detected by repeated measurements using the FT-NIR technique. These results demonstrate the value of the FT-NIR method to directly measure the fat content of pregnant women in minutes instead of relying on indirect calculations or taking measurements before and after pregnancy to track gestational fat mass accretion.
Photothermal Response of Near-Infrared-Absorbing NanoGUMBOS
Authors: Dumke Jonathan C. , Qureshi Ammar , Hamdan Suzana , El-Zahab Bilal , Das Susmita , Hayes Daniel J. , Boldor Dorin , Rupnik Kresimir , Warner Isiah M.
Published: February 2014

The photothermal properties of several near-infrared-absorbing nanoparticles derived from group of uniform materials based on organic salts (GUMBOS) and composed of cationic dyes coupled with biocompatible anions are evaluated. These nanoparticles were synthesized using a reprecipitation method performed at various pH values: 2.0, 5.0, 7.0, 9.0, and 11.0. The cations for the nanoparticles derived from GUMBOS (nanoGUMBOS), [1048] and [1061], have absorbance maxima at wavelengths overlapping with human soft tissue absorbance minima. Near-infrared-absorbing nanoGUMBOS excited with a 1064 nm continuous laser led to heat generation, with an average temperature increase of 20.4 ± 2.7 °C. Although the [1061][Deoxycholate] nanoGUMBOS generated the highest temperature increase (23.7 ± 2.4 °C), it was the least photothermally efficient compound (13.0%) due to its relatively large energy band gap of 0.892 eV. The more photothermally efficient compound [1048][Ascorbate] (64.4%) had a smaller energy band gap of 0.861 eV and provided an average photothermal temperature increase of 21.0 ± 2.1 °C.
High-Pressure–Low-Temperature Cryostat Designed for Use with Fourier Transform Infrared Spectrometers and Time-Resolved Infrared Spectroscopy
Authors: Calladine James A. , Love Ashley , Fields Peter A. , Wilson Richard G.M. , George Michael W.
Published: February 2014

The design for a new high-pressure–low-temperature infrared (IR) cell for performing experiments using conventional Fourier transform infrared or fast laser-based time-resolved infrared spectroscopy, in a range of solvents, is described. The design builds upon a commercially available compressor and cold end (Polycold PCC® and CryoTiger®), which enables almost vibration-free operation, ideal for use with sensitive instrumentation. The design of our cell and cryostat allows for the study of systems at temperatures from 77 to 310 K and at pressures up to 250 bar. The CaF2 windows pass light from the mid-IR to the ultraviolet (UV), enabling a number of experiments to be performed, such as Raman, UV-visible absorption spectroscopy, and time-resolved techniques where sample excitation/probing using continuous wave or pulsed lasers is required. We demonstrate the capabilities of this cell by detailing two different applications: (i) the reactivity of a range of Group V–VII organometallic alkane complexes using time-resolved spectroscopy on the millisecond timescale and (ii) the gas-to-liquid phase transition of CO2 at low temperature, which is applicable to measurements associated with transportation issues related to carbon capture and storage.
Identification of Faulted Feeder Section in Distribution Systems Using Overcurrent Information from Switching Devices
Authors: Liao Yuan
Published: February 2014

Promptly locating faults in distribution systems plays an essential role in restoring services. Presence of laterals may lead to multiple solutions by impedance-based method. One possible way for quickly identifying the faulted feeder section is to utilize the overcurrent information provided by the switching devices installed in the system. This article presents an enhanced method that identifies the faulted feeder section based on the information from switching devices and the network structure. The proposed method is general, applicable to presence of a single-fault or multi-faults, and suitable for single- or multi-source networks. The advantages over existing methods are elimination of iterative steps for multi-source systems. Case studies have demonstrated that the method is effective in identifying the faulted section.
Modeling of Synthetic Turbulence Generation in Boundary Layer by Using Zonal RANS/LES Method
Authors: Issakhov Alibek
Published: February 2014

Zonal RANS/LES modelings have received considerable attention over recent years. Especially with the?attached boundary layers that computed using the Reynolds-averaged Navier – Stokes (RANS) equations, and non-equilibrium zones of the flow by large-eddy simulation (LES). Generation eddies from a smooth RANS field of turbulent eddies capable of supporting the Reynolds stresses in the LES zones are one issue that may affect the accuracy of the results of zonal methods. Synthetic turbulence and controlled forcing are used to generate turbulence structures in the LES zones.
Retail Inventory: Managing the Canary in the Coal Mine
Authors: Gaur Vishal , Kesavan Saravanan , Raman Ananth
Published: February 2014

Retail inventory is a statistic that is closely watched by retailers as well as their investors, lenders, and suppliers. Retailers not only benefit from inventory, but also bear the cost of excess inventory. Investors, lenders, and suppliers interpret this statistic for signs of the retailer's health, future sales prospects, and impending costs. This article synthesizes the perspectives of investors, lenders, and suppliers on inventory. Moreover, the article shows that inventory turns, a commonly used metric to identify excess inventory, has important limitations that reduce its utility for all these stakeholders. It then presents a new metric, adjusted inventory turns, which can be effectively utilized by all stakeholders to assess whether a retailer is carrying too much or too little inventory.
Two patients with atypical low triiodothyronine syndrome: primary deiodinase abnormalities?
Authors: Tevaarwerk Gerald J M
Published: February 2014

Low triiodothyronine (T3) concentrations in the presence of normal thyroxine (T4) and TSH levels, referred to as the low T3 syndrome (LT3S), are common. LT3S may be caused by starvation, various non-thyroidal illnesses (NTIs) and some medications. Reverse T3 (rT3) concentrations are elevated in the more severely ill, and they characteristically fail to respond to exogenous levothyroxine (l-T4) therapy. The biochemical abnormalities have been explained on the basis of altered peripheral deiodinase activities. Herein, we report on two patients with hypothyroid symptoms who on testing were found to have LT3S. They were atypical clinically in not having LT3S due to any of the usual causes, had no increased rT3 concentrations, and had a normal negative TSH feedback response to l-T4. One (patient 1) had previously been diagnosed with Hashimoto's autoimmune primary hypothyroidism and was on l-T4 therapy. Both had T4 concentrations in the reference range. TSH levels were elevated in patient 1 and in the reference range in patient 2. Starting or increasing l-T4 doses resulted in no clinical improvement and no increase in T3 levels in spite of a marked increase in T4 levels. It is suggested that in the absence of the usual causes, lack of elevated rT3 levels, response to treatment and intact negative TSH feedback these two patients differ from the usual secondary causes of decreases in deiodinase activity. It is speculated that they may represent primary alterations in deiodinase enzymes possibly due to genetic variations in the deiodinase-encoding genes.

Learning points

LT3S is commonly found secondary to starvation, NTIs and use of some medications.

Low T3 levels are the result of alterations in the activity of deiodinase enzymes.

LT3S without the usual causes may represent a primary disturbance in deiodinase activity.
A case of insulin and ACTH co-secretion by a neuroendocrine tumour
Authors: Solomou S , Khan R , Propper D , Berney D , Druce M
Published: February 2014

A 33-year-old male was diagnosed with a metastatic neuroendocrine carcinoma of uncertain primary. He defaulted from follow-up without therapy and some months later developed episodic severe hypoglycaemia, which was found to be associated with inappropriately elevated insulin and C-peptide levels. It was considered likely that the neuroendocrine tumour was the source of the insulin secretion. Diazoxide and somatostatin analogue were used to control hypoglycaemia. Much later in the course of the disease, he developed metabolic derangement, increased skin pigmentation and psychological disturbance, without frankly Cushingoid physical findings. Investigations revealed highly elevated cortisol levels (the levels having previously been normal) with markedly raised ACTH levels, consistent with the co-secretion of ACTH and insulin by the tumour. Treatment with metyrapone improved his psychological state and electrolyte imbalance. Unfortunately, despite several cycles of first-, second- and third-line chemotherapy from the start of the first hormonal presentation onwards, imaging revealed widespread progressive metastatic disease and the patient eventually passed away. This case highlights the importance of keeping in mind the biochemical heterogeneity of endocrine tumours during their treatment.

Learning points

The clinical presentation of insulin-secreting tumours includes symptoms of neuroglycopaenia and sympathetic overstimulation.

Tumour-associated hypoglycaemia can be due to pancreatic insulinomas, and although ectopic hormone production occurs in a number of tumours, ectopic secretion of insulin is rare.

A possible switch in the type of hormone produced can occur during the growth and progression of neuroendocrine tumours and, when treating neuroendocrine tumours, it is important to keep in mind their biochemical heterogeneity.
Temporal regulation of fibroblast growth factors and their receptors in the endometrium and conceptus during the pre-implantation period of pregnancy in cattle
Authors: Okumu L A , Forde N , Mamo S , McGettigan P , Mehta J P , Roche J F , Lonergan P
Published: February 2014

We hypothesised that the expression pattern of members of the fibroblast growth factor (FGF) family would be altered in the endometrium as the oestrous cycle/early pregnancy progressed associated with changes in the expression pattern of their receptors in the developing embryo/conceptus. Expression of FGF1 and FGF10 transcript variants 1 and 2 increased significantly as the oestrous cycle/early pregnancy progressed. Neither progesterone (P4) supplementation nor pregnancy status significantly affected the expression of any of the FGF ligands studied. However, there was a significant interaction between day, pregnancy and P4 status on FGF2 expression (P<0.05) and a significant interaction between P4 status and day on FGF10_tv2 expression. FGF10 protein was localised in the luminal and glandular epithelium as well as the stroma but was not detected in the myometrium. By RNA sequencing, the expression of FGF ligands in the developing embryo/conceptus was found to be minimal. The expression of FGF receptor 1 (FGFR1), FGFR2, FGFR3, FGFR4, FGFRL1 and FRS3 was significantly affected by the stage of conceptus development. Interestingly, the expression of FGFR1 and FGFR4 was higher during early embryo development (days 7–13, P<0.05) but decreased on day 16 (P<0.05) while FGFR2 (P<0.001) expression was similar from day 7 through to day 13, with a significant increase by day 16 (P<0.05) that was maintained until day 19 (P>0.05). In conclusion, these data demonstrate that FGF ligands are primarily expressed by the endometrium and their modulation throughout the luteal phase of the oestrous cycle/early pregnancy are associated with alterations in the expression of their receptors in the embryo/conceptus.
Composite Geopolymeric Binders of Fly Ash, Effect of the Particle Size and Addition of Calcium Aluminate Cement
Authors: Cardona-Hernández L.L , Escalante-García J.I.
Published: February 2014

An investigation on composite geopolymeric binders, based on alkali activated fly ash (PFA) substituted with low-alumina calcium aluminate cement (CAC), was carried out using a Factorial experimental design in which the factors and levels were: %Na2O, 8-12%; modulus of the solution Ms=SiO2/Na2O =0 - 2, 10-30 wt% of CAC and fineness of PFA (D90) from 161.8 to 6.46 microns. The contribution of each factor was estimated with the 28-day compressive strength as the response variable. The curing temperature was 24h@60°C, and then at 20°C until mechanical testing. The specimens were also characterized by XRD and SEM. The results showed that the grinding modified the morphology of the PFA without changing the crystallographic or chemical characteristics as detected by XRD; and improved the mechanical properties of the geopolymers. The strength increased notably with the Ms up to 1, and reduced for Ms >1; the strength increased with the %Na2O and %CAC. Electron microscopy showed a higher densification at smaller PFA particle size, and the CAC addition promoted the formation of zeolite and Na2O-Al2O3-SiO2-H2O products.
Sulfate Attack on Concrete: Is it real or just a misinterpretation of damage done by biodeterioration?
Authors: Rendon Diaz Miron Luis Emilio , Lara Montserrat Rendon , Lara Magaña Maria Eugenia
Published: February 2014

At the present time, no material is known that is completely inert to chemical or biochemical action and immune to weathering damage. Concrete is no exception, but, under what might be considered normal exposure conditions, it has a very long life. Concrete made by the Romans from natural cement is in excellent condition after more than 2000 years of service. The controversies generated by contradictory expert testimonies in several lawsuits involving sulfate attack on concrete, and by the large numbers of recently published papers containing data on the subject, have caused considerable anxiety about sulfate attack mechanisms and the service life of concrete structures. Furthermore, frequently the physical attack by salt crystallization is being confused with the classical sulfate attack, which involves the chemical interaction between sulfate ions from an external source and the constituents of cement paste. In addition, there is also an internal sulfate attack –a chemical attack in which the source of sulfate ions resides in the concrete aggregates or cement–. Additionally, modern concrete as been affected by the products of microorganism metabolism, in particular sulfuric acid, this damage done to hardened concrete is known as concrete biodeterioration and also known as microbiologically induced corrosion of concrete (MICC). Being perhaps this biodeterioration the most important cause of concrete decay and perhaps the true explanation of sulfate attack on concrete. Some of the controversies about sulfate attack are addressed in this article, we have studied the case applying simple considerations concerning concrete composition and flouting at the same time some of the stricter observed paradigms in the cement and concrete industry. It is concluded that a holistic approach is necessary to separate the real causes of sulfate attack on concrete from the imaginary ones.
Manipulation of Wetting Directions Using Nanostructures with Asymmetric Surface Energies
Authors: Lai Changquan , Thompson Carl V. , Choi W.K.
Published: February 2014

Ordered arrays of polymeric nanostructures with different shapes were generated using laser interference lithography and plasma etching. Surface energy anisotropy was produced in each nanostructure in the array through oblique angle deposition of a hydrophilic metal. When a water droplet was placed on such a surface, it was found to wet preferentially in the direction of the hydrophilic face. Depending on the shape of the nanostructure and the deposition direction, wetting can be made uni-, bi- or tri-directional. Insights obtained in this study contribute to the understanding of wetting on rough, chemically heterogeneous surfaces and provide new methods to engineer functional surfaces for the control of wetting directions.
Pulp Tissue Dissolution Capacity of Sodium Hypochlorite Combined with Cetrimide and Polypropylene Glycol
Authors: Almeida Luiza Helena Silva de , Leonardo Natália Gomes e Silva , Gomes Ana Paula Neutzling , Giardino Luciano , Souza Erick Miranda , Pappen Fernanda Geraldo
Published: February 2014

This study evaluated the influence of the addition of cetrimide and polypropylene glycol to sodium hypochlorite (NaOCl) on its capacity to dissolve pulp tissue. Bovine pulp fragments with standardized weight and volume were immersed for 5, 15 and 30 min in 2 mL of NaOCl and Hypoclean (NaOCl added with cetrimide and polypropylene glycol) solutions at 5.25%, 2.5%, 1%, 0.5% and 0.25% and afterwards re-weighted. Distilled water was used as a control. The percentage of tissue loss was considered for statistical analysis (univariate ANOVA, SPSS, v. 17.0) at 5% significance level. There was no tissue dissolution in the control group. NaOCl added with surfactants (Hypoclean) dissolved more pulp tissue (p<0.05) than NaOCl alone. Tissue dissolution was directly dependent on the concentration of solutions (p<0.05), and also on the time range (p<0.05). The combination of NaOCl at high and low concentrations with the surfactants cetrimide and polypropylene glycol increased significantly its capacity to dissolve pulp tissue.
Do the Clinical Effects of Enamel Matrix Derivatives in Infrabony Defects Decrease Overtime? A Systematic Review and Meta-Analysis
Authors: Zanatta Fabricio Batistin , Souza Fernanda Goulart de , Pinto Tatiana Militz Perrone , Antoniazzi Raquel Pippi , Rösing Cassiano Kuchenbecker
Published: February 2014

Previous systematic reviews have demonstrated better results with enamel matrix derivative proteins (EMDP) as compared with open flap debridement (OFD) for the management of infrabony periodontal defects (IPD). The aim of this study was to determine whether these differences vary according to the follow-up and quality of the studies. Cochrane Central Register of Controlled Trials, Medline/PubMed, Lilacs, Embase and Web of Science electronic databases were searched up to August 2013 for randomized clinical trials.Eligible outcomes were changes in probing depth (PD), clinical attachment level (CAL),gingival recession (GR) and bone changes (BC). Studies with follow-up of 12 months showed differences of 0.97 mm (CI95% 0.52 - 1.43) and 1.19 mm (CI95% 0.77 - 1.60) for PD and CAL, respectively, favorable for EMDP. Studies with follow-up ≥ 24 months presented advantages of 1.11 mm (CI95% 0.74 -1.48) for CAL and 0.83 mm (CI95% 0.19 -1.48) for PD,with use of EMDP. Considering the quality of studies, those with low risk of bias showed lower difference between groups, presenting 0.8 mm (CI95% 0.24-1.36) for CAL, favorable for EMDP and without differences for PS (0.51 mm, CI95% -0.21 - 1.23). In conclusion, follow-up time (< or > 2 years) and the risk of bias influence the results of treatment with EMDP in IPD.
Chediak-Higashi Syndrome and Premature Exfoliation of Primary Teeth
Authors: Rezende Karla Mayra , Canela Alfredo Hiram Carrillo , Ortega Adriana Oliveira Lira , Tintel Claudia , Bonecker Marcelo
Published: February 2014

The Chediak-Higashi syndrome (CHS) is a rare hereditary fatal disease, if not treated. These changes are associated with various diseases and syndromes that mainly cause periodontal disease and thus the premature loss of teeth. This paper describes the monitoring of premature loss of primary teeth that began when the child was 5 years old. On presentation his teeth were mobile and there was a history of gingival bleeding. Panoramic radiography revealed generalized and severe bone loss, and the teeth showed no bony support enough for their stability. Blood test was ordered to assess the overall health of the child and giant cells with cytoplasmic granules were found, confirming the diagnosis of CHS. The management of periodontal disease focused on the control of infection and bacterial plaque by mechanical and chemical methods.
Microstructure and Mechanical Properties of Composite Resins Subjected to Accelerated Artificial Aging
Authors: Reis Andrea Candido dos , Castro Denise Tornavoi de , Schiavon Marco Antonio , Silva Leandro Jardel da , Agnelli Jose Augusto Marcondes
Published: February 2014

The aim of this study was to investigate the influence of accelerated artificial aging (AAA) on the microstructure and mechanical properties of the Filtek Z250, Filtek Supreme, 4 Seasons, Herculite, P60, Tetric Ceram, Charisma and Filtek Z100. composite resins. The composites were characterized by Fourier-transform Infrared spectroscopy (FTIR) and thermal analyses (Differential Scanning Calorimetry - DSC and Thermogravimetry - TG). The microstructure of the materials was examined by scanning electron microscopy. Surface hardness and compressive strength data of the resins were recorded and the mean values were analyzed statistically by ANOVA and Tukey's test (α=0.05). The results showed significant differences among the commercial brands for surface hardness (F=86.74, p<0.0001) and compressive strength (F=40.31, p<0.0001), but AAA did not affect the properties (surface hardness: F=0.39, p=0.53; compressive strength: F=2.82, p=0.09) of any of the composite resins. FTIR, DSC and TG analyses showed that resin polymerization was complete, and there were no differences between the spectra and thermal curve profiles of the materials obtained before and after AAA. TG confirmed the absence of volatile compounds and evidenced good thermal stability up to 200 °C, and similar amounts of residues were found in all resins evaluated before and after AAA. The AAA treatment did not significantly affect resin surface. Therefore, regardless of the resin brand, AAA did not influence the microstructure or the mechanical properties.
Effect of Growth Hormone in Experimental Tooth Movement
Authors: Ribeiro Jucienne Salgado , Maciel José Vinicius Bolognesi , Knop Luégya Amorin Henriques , Machado Maria Ângela Naval , Grégio Ana Maria Trindade , Camargo Elisa Souza
Published: February 2014

The aim of this study was to evaluate, by histological analysis, the effect of growth hormone (GH) on periodontal ligament and alveolar bone during experimental tooth movement in rats. Eighty male Wistar rats divided into control (C) and experimental (E) groups were examined after 3, 7, 14 and 21 days under controlled climate conditions. Orthodontic force (30 cN) was applied on the maxillary first molar by an orthodontic appliance. Group E received 0.1 IU/kg/day of GH and Group C received 0.5 mL/kg/day of saline. The samples were processed and evaluated under optical microscopy and polarized light microscopy. The Kruskal Wallis test was applied to compare the intergroup variables at 5% significance level. Group E presented a larger number of osteoclasts on the 3rd and 7th days and Howship lacunae on the 3 rd day, a smaller number of blood vessels and greater amount of mature collagen on the 3 rd and 7 th days than Group C (p<0.05). It was concluded that GH accelerated and intensified bone resorption and produced delay in immature collagen formation during experimental tooth movement.
Dimensional Accuracy of Stone Casts Made from Silicone-Based Impression Materials and Three Impression Techniques
Authors: Vitti Rafael Pino , Silva Marcos Aurélio Bomfim da , Consani Rafael Leonardo Xediek , Sinhoreti Mário Alexandre Coelho
Published: February 2014

The aim of this study was to measure and compare the dimensional accuracy of stone casts of a partially edentulous mandibular arch made by two condensation silicones, two addition silicones and three impression techniques (1-step putty/light-body, 2-step putty/light-body and monophase technique). A partially edentulous standard stainless steel mandibular arch cast was obtained with reference points on the permanent mandibular right and left canines, and permanent mandibular right and left second molars. The anteroposterior distances (between the mandibular left canine and second molar and between the mandibular right canine and second molar) and transverse distances (between the mandibular left and right canines and between the mandibular left and right second molars) of stainless steel cast were measured by a microscope at 30× magnification and 0.5 µm accuracy. All impressions were made with condensation or addition silicones. The 1- and 2-step putty/light-body impressions were accomplished with putty and light-body materials and the monophase impressions with light-body material only. After the impression procedures, accuracy of each material and technique was assessed measuring the stone casts poured (n=5) from the impressions, by the same microscope. The differences between the values of stone cast and stainless steel cast were calculated, presented as percentages and analyzed statistically by two-way ANOVA and the means compared by Tukey's test (α=0.05). All distances measured on stone casts showed altered dimensions with significantly negative linear changes (shrinkage) as compared to those of the stainless steel cast. The stone casts made from the addition silicones were dimensionally more accurate. No differences were found among the impression techniques.
Ossifying Fibroma of the Jaws: A Clinicopathological Case Series Study
Authors: Andrade Marcia de , Silva-Sousa Yara Teresinha Correa , Marques Maria Fernanda Teiga , Pontual Maria Luiza dos Anjos , Ramos-Perez Flavia Maria de Moraes , Perez Danyel Elias da Cruz
Published: February 2014

The aim of this study was to assess the clinical, radiographic and microscopic features of a case series of ossifying fibroma (OF) of the jaws. For the study, all cases with OF diagnosis from the files of the Oral Pathology Laboratory, University of Ribeirão Preto, Ribeirão Preto, SP, Brazil, were reviewed. Clinical data were obtained from the patient files and the radiographic features were evaluated in each case. All cases were reviewed microscopically to confirm the diagnosis. Eight cases were identified, 5 in females and 3 in males. The mean age of the patients was 33.7 years and most lesions (7 cases) occurred in the mandible. Radiographically, all lesions appeared as unilocular images and most of them (5 cases) were of mixed type. The mean size of the tumor was 3.1 cm and 3 cases caused displacement of the involved teeth. Microscopically, all cases showed several bone-like mineralized areas, immersed in the cellular connective tissue. From the 8 cases, 5 underwent surgical excision and 1 patient refused treatment. In the remaining 2 cases, this information was not available. In conclusion, OF occurs more commonly in women in the fourth decade of life, frequently as a mixed radiographic image in the mandible. Coherent differential diagnoses are important to guide the most adequate clinical approach. A correlation between clinical, imaginological and histopathological features is the key to establish the correct diagnosis.
Detection of Root Canal Isthmuses in Molars by Map-Reading Dynamic using CBCT images
Authors: Pecora Jesus Djalma , Estrela Carlos , Bueno Mike Reis , Porto Olavo Cesar , Alencar Ana Helena Goncalves , Sousa-Neto Manoel Damiao , Estrela Cyntia Rodrigues de Araujo
Published: February 2014

The aim of this study was to detect root isthmuses in maxillary and mandibular molars and evaluate their frequencies using map-reading dynamics in CBCT images. Two hundred extracted human maxillary and mandibular molars were used in ex vivo assay. A consecutive sample of two hundred maxillary and mandibular molars (first and second) was selected from CBCT exams. The isthmuses were detected from the pulp orifice to the apex and were recorded according to their beginning and their end, into categories: 1. begin and end in cervical third; 2. beginning in cervical third and end in middle third; 3. beginning in cervical third and end in apical third; 4. beginning and end in middle third; 5. begin in middle third and end in apical third; 6. beginning and end in apical third; 7. no isthmus. The scans were obtained in different planes with map-reading in axial slices of 0.5 mm/0.5 mm involved the coronal to apical direction. The frequencies of isthmus were analyzed according to the level of root and evaluated by Chi-square test. The level of significance was set at α=0.05. The presence of isthmus detected in maxillary molars was 86% in ex vivo assay and 62% in vivo assay, whereas in mandibular molars was observed 70% in ex vivo assay and 72% in vivo assay. The frequency of isthmus was high in both study models. The map-reading dynamics in CBCT images was found to be precise to detect the localization of isthmus.
Vulnerability of women living with HIV/aids
Authors: Duarte Marli Teresinha Cassamassimo , Parada Cristina Maria Garcia de Lima , Souza Lenice do Rosário de
Published: February 2014

OBJECTIVE: outline the profile of women living with the human immunodeficiency virus/aids in interior cities in São Paulo State, in the attempt to identify characteristics related to individual, social and programmatic vulnerability and to analyze the conditions in which they discovered their serological status. METHOD: between October 2008 and December 2010, a cross-sectional study was undertaken with 184 women attended at a specialized service. The data were collected through an interview and gynecological test, including the collection of samples for the etiological diagnosis of sexually transmissible conditions. RESULTS: the women were predominantly white, between 30 and 49 years of age, lived with a partner, had a low education level, multiple sexual partners across the lifetime and unsafe sexual practices. The prevalence of sexually transmitted diseases corresponded to 87.0%. CONCLUSION: the study suggests the need to offer gynecological care in specialized services and the accomplishment of multiprofessional actions to reinforce the female autonomy in protective decision making.
The principles of the Brazilian Unified Health System, studied based on similitude analysis
Authors: Pontes Ana Paula Munhen de , Oliveira Denize Cristina de , Gomes Antonio Marcos Tosoli
Published: February 2014

OBJECTIVES: to analyze and compare the incorporation of the ethical-doctrinal and organizational principles into the social representations of the Unified Health System (SUS) among health professionals. METHOD: a study grounded in Social Representations Theory, undertaken with 125 subjects, in eight health institutions in Rio de Janeiro. The free word association technique was applied to the induction term "SUS", the words evoked being analyzed using the techniques of the Vergès matrix and similitude analysis. RESULTS: it was identified that the professionals' social representations vary depending on their level of education, and that those with higher education represent a subgroup responsible for the process of representational change identified. This result was confirmed through similitude analysis. CONCLUSION: a process of representational change is ongoing, in which it was ascertained that the professionals incorporated the principles of the SUS into their symbolic constructions. The similitude analysis was shown to be a fruitful technique for research in nursing.
Evaluation of the conformity of assistential practice in the maintenance of the temporary double-lumen dialysis catheter
Authors: Rosetti Késia Alves Gomes , Tronchin Daisy Maria Rizatto
Published: February 2014

OBJECTIVE: to evaluate the conformity of the assistential practice in the maintenance of the temporary double-lumen catheter for hemodialysis, by means of the use of the process indicator, in the University Hospital of the University of São Paulo. METHOD: a quantitative, exploratory-descriptive and observational study. The sample was made up of 155 observations of persons with temporary double-lumen catheters, in the period March - November 2011, using the Indicator of the Maintenance of the Temporary Double Lumen Catheter for Hemodialysis. RESULTS: the rate of general conformity of the assistential practice corresponded to 65.8%. Of the practice's 13 components, 9 (69.2%) attained 100% conformity. The hygienization of hands by the professionals and the use of a mask by the patients during the disconnection from the hemodialysis had the worst rates (83.9%). CONCLUSION: although the actions evaluated are implemented in the unit, it is necessary to propose and apply educational strategies with the health team, as well as to institute periodical assessments, so as to raise the conformity rates, ensuring the quality of the hemodialysis services.
Hospital morbidity in a medium-sized city: differentials between men and women
Authors: Arruda Guilherme Oliveira de , Molena-Fernandes Carlos Alexandre , Mathias Thais Aidar de Freitas , Marcon Sonia Silva
Published: February 2014

OBJECTIVE: characterize the hospital morbidity of adults living in the city of Maringá, PR, Brazil, between 2000 and 2011, focusing on the differential between men and women. METHOD: this descriptive study was developed based on data from the Hospital Information System of the Unified Health System in order to investigate the association between groups of hospitalization causes and the average length of hospitalization per gender, in three-year periods. RESULTS: the main groups of hospitalization causes for men were: mental disorders, lesions and circulatory diseases; and, among women: tumors, circulatory and genitourinary diseases. Mental disorders and lesions, tumors, circulatory and genitourinary diseases were significantly associated with the female and male genders across the study period. Although not significant, the mean length of hospitalization dropped across the four three-year periods, and only showed a significant difference between men and women in the second triennium. CONCLUSION: differences in the hospital morbidity profile between men and women underline the need for specific health and nursing actions, especially in primary health care, with a view to reducing hospitalizations due to the main groups of causes in the city.
Direct and indirect nursing care time in an Intensive Care Unit
Authors: Kakushi Luciana Emi , Évora Yolanda Dora Martinez
Published: February 2014

OBJECTIVE: to identify the direct and indirect nursing care time in an Intensive Care Unit. METHOD: a descriptive/exploratory study conducted at a private hospital. The Nursing Activities Score classification system was used to estimate the direct care time, and electronic health records were used to estimate the indirect care time. The data were collected from March to June 2011. RESULTS: the findings indicate that the average nursing care time was 29.5 hours, consisting of 27.4 hours of direct care and 2.1 hours of indirect care per patient/day. The nursing care time was higher on weekends and holidays, with predominant use of electronic medical records at night. CONCLUSION: ascertaining nursing care times will contribute to a quantitative evaluation of human resources, assisting in the determination of workloads and workforce size.
Prenatal Care for Adolescents and attributes of Primary Health Care
Authors: Barbaro Maria Cristina , Lettiere Angelina , Nakano Ana Márcia Spanó
Published: February 2014

OBJECTIVE: evaluate prenatal care for adolescents in health units, in accordance with the attributes of Primary Health Care (PHC) guidelines. METHOD: quantitative study conducted with health professionals, using the Primary Care Assessment Tool-Brazil to assess the presence and extent of PHC attributes. RESULTS: for all the participating units, the attribute Access scored =6.6; the attributes Longitudinality, Coordination (integration of care), Coordination (information systems) and Integrality scored =6.6, and the Essential Score =6.6. Comparing basic units with family health units, the attribute scores were equally distributed; Accessibility scored =6.6, the others attributes scored =6.6; however, in the basic units, the Essential Score was =6.6 and, in the family health units, =6.6. CONCLUSION: expanding the coverage of family health units and the training of professionals can be considered strategies to qualify health care.
Total staff costs to implement a decision support system in nursing
Authors: Castilho Valéria , Lima Antônio Fernandes Costa , Fugulin Fernanda Maria Togeiro , Peres Heloisa Helena Ciqueto , Gaidzinski Raquel Rapone
Published: February 2014

OBJECTIVE: to identify the direct labor (DL) costs to put in practice a decision support system (DSS) in nursing at the University Hospital of the University of São Paulo (HU-USP). METHOD: the development of the DSS was mapped in four sub-processes: Conception, Elaboration, Construction and Transition. To calculate the DL, the baseline salary per professional category was added to the five-year additional remuneration, representation fees and social charges, and then divided by the number of hours contracted, resulting in the hour wage/professional, which was multiplied by the time spend on each activity in the sub-processes. RESULTS: the DL cost corresponded to R$ 752,618.56 (100%), R$ 26,000.00 (3.45%) of which were funded by a funding agency, while R$ 726,618.56 (96,55%) came from Hospital and University resources. CONCLUSION: considering the total DL cost, 72.1% related to staff wages for the informatics consulting company and 27.9% to the DL of professionals at the HU and the School of Nursing.
Assessment of pain during rest and during activities in the postoperative period of cardiac surgery
Authors: Mello Larissa Coelho de , Rosatti Silvio Fernando Castro , Hortense Priscilla
Published: February 2014

OBJECTIVE: to assess the intensity and site of pain after Cardiac Surgery through sternotomy during rest and while performing five activities. METHOD: descriptive study with a prospective cohort design. A total of 48 individuals participated in the study. A Multidimensional Scale for Pain Assessment was used. RESULTS: postoperative pain from cardiac surgery was moderate during rest and decreased over time. Pain was also moderate during activities performed on the 1st and 2nd postoperative days and decreased from the 3rd postoperative day, with the exception of coughing, which diminished only on the 6th postoperative day. Coughing, turning over, deep breathing and rest are presented in decreased order of intensity. The region of the sternum was the most frequently reported site of pain. CONCLUSION: the assessment of pain in the individuals who underwent cardiac surgery during rest and during activities is extremely important to adapt management and avoid postoperative complications and delayed surgical recovery.
Evaluation of the extract of Zeyheria tuberculosa with a view to products for wound healing
Authors: Sarmento Patrícia de Albuquerque , Ataíde Terezinha da Rocha , Barbosa Ana Paula Fernandes , Araújo-Júnior João Xavier de , Lúcio Ingrid Martins Leite , Bastos Maria Lysete de Assis
Published: February 2014

OBJECTIVES: to evaluate the antimicrobial, cytotoxic and healing activities of the ethanolic extract of the stems of Z. tuberculosa via topical use and/or oral ingestion. METHOD: antimicrobial assays in vitro using the disk diffusion method, the Artemia salina toxicity test, and in vivo assays with Wistar rats. From these was collected clinical, histological and biochemical data for evaluating the healing process. RESULTS: in vitro antimicrobial testing showed activity in relation to Streptococcus pyogenes, Staphylococcus aureus and Staphylococcus epidermidis, with zones of inhibition of 18, 14 and 10 mm, respectively. The best minimum inhibitory concentration was 62.5 µg/ml for S. aureus, this bacteria being chosen for the in vitro assays. Animals treated with the ointments with the extract of Z. tuberculosa showed the best results in the reduction of the wound diameter, data confirmed by the presence of re-epithelialization in the histological samples. CONCLUSION: the extract was shown to be promising for the continuation of studies which may identify the active ingredients responsible for the pharmacological activity and its mechanism of action in the process of wound healing, so as to develop a product which may be used as an alternate means in the repair of infected cutaneous wounds.
Enrichment of compressive strength in microbial cement mortar
Authors: Senthilkumar Veerasamy , Palanisamy Thangaraju , Vijayakumar Vellalapalayam Nallagounder
Published: February 2014

The method of microbial mineral plugging in porous media is common in nature. Physical and biochemical properties of calcium carbonate (CaCO3) precipitation induced by Enterobacter and Serratia microorganisms into cement mortar specimens are studied and analysed. X-ray diffraction is used to identify the calcium carbonate crystal as calcite, vaterite, aragonite. Scanning electron microscopy (SEM) is used to verify the formations of white precipitation (calcium carbonate) in the microbial cement mortars. The improvement of strength in the concrete/cement mortar base is attributable to the formation of calcium carbonate, which fills the pores between the cement sand matrices. In the present study a noteworthy enhancement of compressive strength of 44% is observed in the biocuring Enterobacter-treated specimen relative to control. This method of implanting semi-solid mixtures onto the surface of the cement paste specimens shows significant effects such as decrease of permeability and capillary water penetration.