bluuebunny/crossref_metadata_2025 huggingface dataset:
The Use of High - Sucrose Culture Media for the Identification of Oral Streptococci in Infant- Mother Pairs
Authors: Martha Krisztina , Bica Cristina , Frunda Edva Anna
Published: February 2020

By the end of the 60�s, the theory that refined carbohydrates promotes the absorption of saccharolytic Gram-positive microbial species on the tooth surfaces has become generally. Mutans streptococci (Streptococcus mutans and Streptococcus sobrinus) were key players in this theory. On agar plates, Str. mutans produces small, circular colonies, in the presence of glucose, and in the presence of sucrose large, sticky, gelatinous colonies. This gelatinous texture is due to the shell material: mutant 1 � 3 glucose polymers and dextran 1 �! 6 glucose polymers. Str. mutans are able to survive in the oral cavity with a pH lower than 5.5. That is why consecutive multiple sugar intake promotes the colonization of Str. mutans, which results in dental caries in stagnant zones. As oral pH is continuously shifted to acid, more acid-resistant bacteria appear. Our aim was to identify species in infant-mother pair gingival crevicular bacterial flora, which can be detected on high-sucrose culture media and to underline the jeopardy of vertical oral contamination from mother to infant.
Methylene blue staining test in assessing safe margins in laryngeal papillomatosis
Authors: Hainarosie Razvan , Pituru Silviu , Stefanescu Dragos Cristian , Hainarosie Mura , Ionita Irina , Pietrosanu Catalina , Ionut Mircea Gheorghita , Zainea Viorel
Published: February 2020

Laryngeal papillomatosis, although a viral and benign disease, poses a great challenge for the ENT surgeon from a therapeutical point of view. The lack of a curative treatment and the tendency of the papillomatosis to recur in an extensive manner require an aggressive treatment. Although multiple medical therapies are available, their results are not always the desired ones. That is why nowadays the focus of the therapy is on the surgical approach. The best results may be obtained thru multiple surgeries, with resection of all papilloma foci. Although this approach may impact the quality of life of the patients due to the multiple interventions required, the overall result translates into a physiologic airway. Because the site where the lesions first appear is at an epithelial level, tendency to use methods of early diagnosis, that make the disease recognizable before extensive lesions, is the natural tendency. Also, it is extremely important to remove all papilloma lesions during surgery, thus minimizing the chances of recurrence or at least increasing the interval between interventions.The aim of this paper is to present the methylene blue staining test as an adjuvant method of evaluating the resection margins during surgery for laryngeal papillomatosis. This method can improve the results of surgery and increase the patient�s adherence to treatment, by decreasing the number of interventions required.
Determination of Physicochemical Properties and Emissions for Different Blends of Biodiesel from Watermelon(Citrullus lanatus L.) Seeds and Diesel Fuel
Authors: Dumitru Mihaela Gabriela , Badea Delia Nica , Tutunea Dragos
Published: February 2020

Across the world the fossil fuels are depleting and countries are forced to find an alternative source to reduce green house gases and replace petroleum fuels. Depending of the raw material sources, vegetable oils, animal fats or algae, biodiesel offers a solution for a clean-burning diesel fuel. Watermelon (Citrullus lanatus L.) seed were collected and the oil was extracted. The oil was transformed into fatty acid methyl esters through a transesterification process and blended in various proportions with diesel fuel. The physico-chemical properties of fuels were determined. Results obtained showed that the biodiesel has a density (0.870 g/cm3), kinematic viscosity 40�C (3.1 mm2/s), flash point (128�C), saponification index (150 mgKOH/g), iodine index (108 mgI2/100g), peroxide index (3.7 mEqO2/Kg) and oxidation stability (6 hours) in the range of UE specifications. The engine tests were conducted on a Deutz F4L912 diesel engine, 51 kW, 4-stroke, air cooled, direct injection diesel engine. From the test performed was observed that the CO and HC emissions were reduced due to high content of oxygen in biodiesel blends.
Effect of CuFe2O4 Nanoparticles on Fronth Stability in Wastewater Treatment by Flotation
Authors: Covaliu Cristina Ileana , Moga Ioana Corina , Vasile Eugeniu , Matache Mihai Gabriel , Petrescu Gabriel
Published: February 2020

Flotation is a method applied very often in wastewater treatment. One way of improving the efficiency of wastewater treatment by flotation is increasing the quantity and stability of foam. For this purpose, in this paper was studied CuFe2O4 oxide nanomaterial for treatment of wastewater containig oil as pollutant. CuFe2O4 was prepared by coprecipitation method and their structural and morphological characterisation was done by XRD and TEM analyses. In order to evaluate their potential of application in wastewater treatment by flotation were invesigated the separation efficiency of oil from wastewater and the quantity and foam stability.
Sorption of Heavy Metal on Natural Clay
Authors: Stefan Mircea , Bors Adriana , Stefan Daniela Simina , Savu Radu Ionut Alexandru , Marinescu Cicerone
Published: February 2020

Sorption of heavy metals on Na-montmorillonite was studied as a function of solution pH and different concentrations of background electrolyte and also a function of added metal ion at constant pH. Equilibrium isotherms have been measured and analyzed using a Langmuir isotherm model. The metal ions were predominantly adsorbed on the permanent charge sites in a easily replaceable state. There was also evident a substantial involvement of the hydroxyl groups on the edges of Na-montmorillonite in specific adsorption of the cations especially at higher pH.
Diagnostic Value of Real-Time Shear Wave Elastography in Diagnosing Thyroid Cancer
Authors: Oprea Maria Cristina , Vlad Mihaela , Golu Ioana , Sporea Ioan , Fulger Lazar
Published: February 2020

Thyroid nodules are a common pathology found in 50 to 60% of otherwise healthy people. Diagnostic imaging techniques are help discriminating between benign and malignant nodules, while fine needle aspiration is still a gold standard. Shear wave elastography, a recent imaging technique, holds the promise to become reliable diagnostic tools and is currently used in combination with ultrasound. We here report data obtained in a series of 52 thyroid nodules analysed by means of elastography, as well as conventional and Doppler ultrasound. We found no differences in age, nodule and thyroid volume, length, width, thickness and maximum diameter between benign and malignant lesions. Several sonographic patterns are considered to be predictive of malignancy, out of which we only found the intranodular blood flow to be statistically significant. By the means of shear wave elastography we have first assessed tissue elasticities, which are shown in a range of colours, depending on tissue elasticity/stiffness. Then, we have measured and recorded four parameters automatically displayed by the system, namely SWE-mean, SWE-max, SWE-SD and SWE-ratio. Data analysis showed all these quantitative parameters had good sensitivity, specificity, positive predictive value, negative predictive value and area under the curve, as calculated by the ROC curve. As with these parameters, the cut-off points were lower than in literature, still able to indicate reliable diagnoses, which were confirmed by histopathological exam. Our conclusion is that shear wave elastography has great potential for reliably and accurately diagnosing thyroid malignancies.
Synthesis, Characterization and Biological Activities of a Novel Mannich Base 2-[(3,4-dimethoxyphenyl)(pyrrolidinyl) methyl]cyclohexanone and its Complexes with Cu(II), Ni(II), Co(II) and Fe(II) Ions
Authors: Liaqat Muhammad , Mahmud Tariq , Ashraf Muhammad , Muddassar Muhammad , Imran Muhammad , Ahmad Tauqeer , Mitu Liviu
Published: February 2020

The titled Mannich base 2-[(3,4-dimethoxyphenyl)(pyrrolidin-1-yl)methyl]cyclohexanone (DPC) was synthesized by condensing 3,4-dimethoxybenzaldehyde, pyrrolidine and cyclohexanone. The synthesis was carried out by using ethanol as solvent. The development of the reaction was monitored on TLC. The complexation of synthesized Mannich base was carried out with Cu(II) chloride, Co(II) chloride, Ni(II) chloride and Fe(II) chloride. The structures of the synthesized Mannich base and its complexes were confirmed by FT-IR, UV-Vis, 1H-NMR, 13C-NMR, MS and TGA techniques. The proposed geometries of the metal complexes were established on the basis of metal/ligand ratio through AAS/ICP and electronic spectra. The synthesized compounds were evaluated for their antiurease and antibacterial activities. The complex with Co(II) show potent antiurease and antibacterial activity. The nature of SAR of Co(II) has been demonstrated using docking studies.
Comparison of Sampling Techniques For qPCR Quantification of Periodontal Pathogens
Authors: Jelihovschi Igor , Drochioi Cristian , Badescu Aida Corina , Lupusoru Raoul Vasile , Munteanu Alexandra Elena , Baranov Nicolae , Manuc Daniela , Serban Raluca Ioana , Cobzaru Roxana Gabriela , Ripa Carmen Valerica , Iancu Luminita Smaranda
Published: February 2020

The diagnosis of periodontal disease is mainly based on use of clinical and radiographic evidence. In this study we employed a quantitative PCR analysis of Aggregatibacter actinomycetemcomitans and Treponema denticola as species strongly involved in periodontal diseases, burden in periodontal pockets to detect the main sampling factors that interfere with qPCR results. From 22 patients with advanced periodontal disease, subgingival plaque was comparatively collected by paper points and periodontal Gracey curettes. Samples were collected from the same situs in presence of gingival bleeding and absence of bleeding. The concordance and agreement of results between samples were assessed. The present study demonstrates that subgingival plaque sampling with sterile absorbable paper points is often accompanied by gingival bleeding resulting in quantification biases of periodontal pathogens.
Process Control of Isobutane-Butene Alkylation Unit
Authors: Dragnea Petru , Bildea Costin Sorin
Published: February 2020

This paper presents the assessment of the dynamic behavior and the control system response of the isobutane-butene alkylation process, via dynamic simulations performed in Aspen Dynamics. The steps for developing the dynamic models, the control structures and the controllers tuning are discussed. The transient behavior of the plant when different disturbances are considered is evaluated. Two flowsheets are investigated � one with three separation columns and the other one with two separation columns for product purification. The results are presented in graphical form and a comparison between the two flowsheets is performed. Methods for varying the plant throughput and for controlling the product purity are provided.
Anti-Strip Additive for Bitumen by Processing Lignin
Authors: Velea Sanda , Bombos Mihaela , Vasilievici Gabriel , Bombos Dorin
Published: February 2020

The study was directed toward modifying of lignin by applying processes of depolymerization alkylation and propoxylation to obtain anti-strip additives for bitumen. Lignin depolymerization was carried out by catalytic hydrotreating on catalyst W-Mo/Al2O3, in continuous system and a fixed bed of catalyst. Dispersant characteristics of phenols obtained by lignin depolymerization where improved by increasing the content of hydrophobic groups and of hydrophilic groups, changes made through alkylation and propoxylation of this phenols. Alkylation of cresols was performed in a batch system in the presence of a catalyst phosphotungstic acid supported on mesoporous silica and propoxylation was performed in a batch system in the presence of KOH catalyst. Heterogenous catalysts characterization where performed by determining the acid strength and textural characteristics. The adhesiveness of bitumen is improved by addition of depolymerized-alkylated-propoxylated lignin.
Uric Acid and NT-proBNP as Biomarkers of Cardiovascular Dysfunction in Hyperthyroidism and Hypothyroidism
Authors: Dima Cozma Lucia Corina , Szalontay Andreea Silvana , Cozma Sebastian , Dascalu Cristina Gena , Cojocaru Doina Clementina , Mitu Florin , Bitere Oana , Ghiciuc Cristina Mihaela
Published: February 2020

The various thyroid axis dysfunctions have cardiovascular consequences both in hyperthyroidism and in hypothyroidism. This cross-sectional study included hyperthyroid and hypothyroid female patients in whom uric acid and NT-proBNP were determined in relation to changes in clinical findings and some echocardiographic parameters. The results of our study suggest that NT-proBNP is a better predictor than uric acid, correlating with left ventricular diastolic dysfunction and systolic blood pressure variations.
Complete-arch Implant-supported Composite Pressed Restorations Fixed Dental Prostheses
Authors: Mihali Sorin Gheorghe , Bratu Emanuel Adrian , Rusu Laura Cristina
Published: February 2020

The aim of this study was to evaluate the clinical performance of the composite pressed on metal framework for full-arch implant-supported fixed prosthesis in order to eliminate the drawbacks related to the chipping of porcelain fused to metal or to zirconia restorations. Sixteen patients received 22 implant-supported screw-cement-retained complete-arch restorations, consisting of composite pressed restorations. All patients were follow-up visit up to 2 years on function (range 24 to 30 months, mean 28.3 months). The outcomes were implant and prosthetic survival rates and calculations of wear determination (mm). After two years of function, the wear values were 95.54�6.88 mm on pressed composite restoration. Using composite pressed restorations appears to be a predictable, esthetic and successful treatment option for method of full arch restorations over implants.
The Test of Lugol Iodine Solution Associated with NBI Examination in Early Diagnostic of Tongue Carcinoma
Authors: Hainarosie Razvan , Ceachir Octavian , Zainea Viorel , Hainarosie Mura , Pietrosanu Catalina , Zamfir Cristina , Stefanescu Dragos Cristian
Published: February 2020

Tongue localization of squamous cell carcinomas is one of the most common sites of intraoral carcinomas, representing nearly 40% of these. The most frequent localization of the tumor is on the posterior lateral border and the ventral surface of the tongue. Recent papers have mentioned an ascendant trend in the incidence of tongue carcinoma in young adults. Early detection of the tongue carcinoma is mandatory because the prognosis of the patient depends on the early diagnostic. The aim of the paper is to analyze the use of lugol iodine solution staining in early diagnostic of tongue carcinoma. The authors propose a protocol for using lugol iodine solution in the screening of tongue carcinoma.
The Reference Intervals Used in Pediatric Medical Analysis Laboratories to Interpret the Results Analysis for Total Serum Calcium
Authors: Antonescu Elisabeta , Totan Maria , Boitor Gheorghe Cornel , Szakacs Julianna , Silisteanu Sinziana Calina , Fleaca Sorin Radu , Cernusca Mitariu Sebastian , Serb Bogdan Horatiu
Published: February 2020

Medical analysis laboratory must establish its own reference intervals depending on the facilities they are working with, the working substances and protocols. These reference intervals must be obtained depending on age groups in order to accurately interpret the results of the analyzes performed. The study is a retrospective one using 3217 data from the electronic archive of the S.C. Vladutiu&Garabedian S.R.L. Clinic in Medias. Total serum calcium was determined by the colorimetric method on the Konelab analyzer. Processing of the collected data was done using the Hoffmann method, considering 5% up to 95% of the values in the database, the values being randomly selected. For comparison, data from the literature was used. In children under 1 year old, it was not possible to calculate the reference intervals since data was insufficient. In the other age groups, reference intervals obtained in the current study were similar to the studied literature. Reference intervals established for calcium can provide important guidance for the reasonable supplementation of this essential element in children.
Relationship Between Calcium-phosphorous Product, Native and Bioprosthetic Mitral Valve Calcifications
Authors: Enache Mihail , Chistol Raluca Ozana , Furnica Cristina , Tinica Grigore
Published: February 2020

Calcification is a common cause of failure of natural and bioprosthetic valves (BPV). Prior research on patients with chronic kidney disease identified increased calcium-phosphorus (Ca-P) product as a risk factor for both arterial and valvular calcifications, an aspect not thoroughly investigated in general population. The aims of our study were to analyse the functional impact of native and bioprosthetic mitral valve (MV) calcification detected on cardiac computed tomography angiography (CCTA), to evaluate risk factors and to assess potential differences from a morphological and chemical point of view between BPV and native MV calcification. The authors performed a retrospective study on 270 patients who underwent CCTA for suspected coronary artery disease, 225 patients with no history of MV replacement and 45 patients with bioprosthetic MV. Mitral leaflet calcification (MLC) was registered in 21 (9.33%) and mitral annular calcification (MAC) in 27 (12%) of the 225 patients suspected for CVD. Echocardiography identified MV sclerosis in 20 cases (8.89%) and MV stenosis in 12 cases (5.33%) with MLC and/or MAC. In the BPV group, 13 patients (28.89%) presented visible BPV calcification associated to echocardiographic regurgitation in 3 (30.77%) cases and higher mean transvalvular gradients. Increased Ca-P product and diabetes mellitus proved to be risk factors for both native and BPV calcification and time since surgery only for BPV calcification. Native and BPV calcification are associated to valve dysfunction and share structural characteristics, thus indicating similar calcification mechanisms. Good glycaemic control in diabetic patients and careful administration of bisphosphonates, calcium and vitamin D supplements are mandatory especially in patients with BPV in order to prevent valve dysfunction due to calcification.
Excited State Polarizability of Some Polycyclic Polyenes
Authors: Ciubara Ana Maria , Benchea Andreea Celia , Zelinschi Carmen Beatrice , Dorohoi Dana Ortansa
Published: February 2020

The electronic absorption spectra of five polycyclic polyenes were recorded in non-polar solvents in order to determine their polarizability in excited states from the strength of the dispersive interactions in their diluted solutions. The bathochromic shifts of p-p* vibronic bands prove the increase of the molecular polarizabilty in the photon absorption process. Some molecular parameters of the analyzed polyenes in their ground state were computed by using the programs from Spartan�14.
Influence of Cu Substitution on the Structure and Magnetic Properties of Partially Crystallized Fe62-xCo10Y8MexB20 Alloys
Authors: Gruszka Konrad , Nabialek Marcin , Szota Michal
Published: February 2020

The paper presents results of structural and magnetic properties investigation of partially crystallized Fe62Co10Y8B20 and Fe61Co10Y8Cu1B20 alloys. Multicomponent bulk amorphous alloys exhibit a significant sensitivity to the composition changes. Even a small quantitative element substitution in composition of the initial alloy may lead to substantial changes in its various properties. Samples in form of thin plates were obtained by radial cooling method resulting in a complete amorphous structure material. Then, the one-step controlled heat treatment process led to partial crystallization of the sample causing the coexistence of amorphous matrix and embedded nanocrystalline phases. As shown in article, amorphous matrix has a noticeable influence on nano-sized grains resulting in a deformation of primary cell structure. Isothermal annealing process also had an impact on the magnetic properties of obtained samples, which was examined by the vibrating sample magnetometer (VSM).
Impact of Agriculture Upon the Chemical Quality of Groundwaters within the Saharian Atlas Steppe El-Meita (Khenchela-Algeria)
Authors: Sedrati Abdenour , Houha Belgacem , Romanescu Gheorghe , Sandu Ioan Gabriel , Diaconu Daniel Constantin , Sandu Ion
Published: February 2020

The El-Meita plateau is situated in the south of the city of Khenchela and it is delimited by the Saharan Atlas to the north and Chott Melghir to the south. The agricultural importance and the high productivity of this region are provided by the aggressive use of chemical fertilizers. For this reason, we have decided to conduct this study, considering that all water bodies � superficial waters and groundwaters � record significant amounts of NO3-, NO2-, NH4-, heavy metals (Pb, Cd, Cu, Zn and Hg) and other major chemical elements. The campaign of collecting the 30 water samples took place in the month of May 2016. The chemical analyses were conducted in the Lacip ain-Mlila laboratory in Algeria. Findings show a contamination of groundwater by nitrates and lead; values exceed the maximum limits approved by World Health Organization (WHO). TDS were also found in high concentrations, which limit the use of water for some agricultural cultures, but which can be admissible for certain salinity-resistant species.
Research on the Chromatic Palette of a Modern Romanian Painter
Authors: Geba Maria , Stratulat Lacramioara , Vornicu Nicoleta , Salajan Daniela , Manea Mihaela M.
Published: February 2020

The paper focuses on two works of art, Chrysanthemums and Roses, painted by Stefan Luchian, a representative painter for the modern Romanian art from the beginning of the 20th century. The two paintings were analyzed by several non-invasive techniques (optical microscopy, grazing light and UV examination, IR reflectography, XRF and Raman spectrometry) in order to get information concerning the chromatic and to assess the state of conservation. The study is focused in particular on yellow, red and white pigments, which are different in the two pictorial compositions: in Chrysanthemums the predominant pigments are Madder lake, cadmium yellow and zinc white mixed with lead white, while in Roses cinnabar, strontium yellow and lead white were found, according to the XRF and Raman analysis.
Novel Adsorbent Used for Cesium Removal from Aqueous Solutions
Authors: Davidescu Corneliu Mircea , Gabor Andreea , Negrea Adina , Ciopec Mihaela , Negrea Petru , Motoc Marilena
Published: February 2020

Cesium (Cs) removal from wastewater becomes an emerging issue after the Fukushima Daiichi Nuclear Power Plant disaster. Cs(I) is an metal ion present in high level radioactive waste and has to be removed for a better disposal in geological formation. The present study investigates the adsorption process of Cs(I) from aqueous solutions on an novel adsorbent material. The novelty of this material is that the solid support, magnesium silicate, is doped with a new extractant, thiourea dissolved in ethyl alcohol. In order to establish the adsorption capacities of the adsorbent material, it was used in the removal process of metal ions. Kinetically, the adsorption process of this metal ion has the best fit for the pseudo-second-order kinetic model. The removal process through adsorption is endothermic and spontaneous due to the thermodynamic studies. Equilibrium studies were also carried out for the Langmuir, Freundlich and Sips model. The new doped material proves to be favourable as adsorbent material in the removal of Cs(I) from polluted water.
Adsorption of p-Cresol by Mesoporous Activated Carbon. II. Mechanism studies and data modeling
Authors: Neagu Mihaela , Popovici Daniela Roxana , Vijan Loredana Elena , Calin Catalina
Published: February 2020

In this work, the adsorption mechanism of p-cresol from aqueous solution onto mesoporous activated carbon was investigated. The mechanism of the adsorption process was determined from Weber-Morris and Boyd models. By graphical and statistical analysis was demonstrated that both film-diffusion and intra-particle diffusion are concurrent in adsorption mechanism. The adsorption mechanism of p-cresol onto mesoporous activated carbon was sustained by FTIR analysis, Boehm titration and the point of zero charge of the GAC.
Sandblasting with Al2O3 Powder in Dental Medicine
Authors: Jumanca Daniela , Galuscan Atena , Stefanescu Teodora , Dumitrache Adina
Published: February 2020

Minimally invasive dental medicine is a novel trend, increasingly accepted by many practitioners and extension for prevention has gradually been abandoned, being replaced by increasingly conservative interventions. Air Abrasion was developed in 1945 by RB Black who started to investigate alternative pseudo-mechanical methods for the removal of dental tissue by bombarding it with a high-speed particulate flow: aluminium oxide. In the present study, we used 14 teeth extracted for orthodontic purposes or due to periodontal disease. We only selected teeth with early carious lesions (cavitary or non-cavitary), located proximally, cervically or on the occlusal surfaces of pits and fissures. Teeth were sandblasted with the RONDOflex plus (KaVo) equipment which uses the principle of hydro-sandblasting (water sandblasting) 50 mm powder. In the most cases the incipient proximal, cervical or occlusal carious processes were successfully removed, resulting in a small cavity, with bevelled margins and with the surface conditioned for composite application. In two cases, the carious process was only partially removed by Air Abrasion which showed the ineffectiveness of sandblasting in cases where the removal of healthy dental hard tissue needs to be removed. For the complete removal of the carious process, cavity preparation with the diamond drill was required, or, alternatively, opening the occlusal relief with the turbine, followed by sandblasting.
Fast and Simple Method for Simultaneous Detection and Quantification of Diazepam and Desmethyldiazepam in Plasma Samples in Psychiatric Patients by GC-MS-FID
Authors: Vlad Cristian Sebastian , Dumitrascu Victor , Vlad Daliborca Cristina , Cimporescu Adinela , Popescu Roxana , Dehelean Liana , Marincu Iosif , Citu Ioana Mihaela , Poenaru Dan V.
Published: February 2020

The aim of this study was to develop a method for identification and quantification of diazepam and its major metabolite, desmethyldiazepam in plasma samples in psychiatric patients. Liquid - liquid extraction (LLE) procedure was applied in order to simplify the pre-analytical phase, followed by gas chromatography � mass spectrometry (GC-MS) detection and gas chromatography � flame ionization (GC-FID) quantitation.
Evaluation of Cumulative Effects of Chemotherapy and Bevacizumab (Avastin�) in Oncological Patients with Periodontal Disease
Authors: Kappenberg Nitescu Diana Cristala , Constantin Mihai , Oanta Cornelia , Martu Ioana , Volovat Simona Ruxandra , Martu Silvia
Published: February 2020

The aim of this study is to evaluate the periodontal status parameters in patients treated with chemotherapy, with or without the adjuvant bevacizumab, to establish a correlation between the type of administered chemotherapy and periodontal status.
Does Adjunctive Use of Hyaluronic Acid Improve Clinical Outcome of Mechanical Therapy for Cases of Mild Aggressive Periodontitis
Authors: Pogan Andreea A. , Buzatu Roxana , Onisei Dan , Onisei Doina
Published: February 2020

Hyaluronic acid is an essential component of the periodontal ligament matrix and it has shown a number of clinical therapeutic properties, especially an anti-inflammatory effect on the gingival tissue. The aim of this study is to evaluate the potential benefits of using hyaluronic acid gel in topical application as an adjunct to mechanical therapy in the management of aggressive periodontitis. Results show an obvious improvement of clinical parameters, especially regarding the evolution of healing of the gingival tissue after periodontal therapy. Nevertheless, the antimicrobial effect needs to be proven in further studies.
Bituminos Insulations Durability of Underground Metallic Pipelines II. Laboratory study on the aging of bituminous material
Authors: Lingvay Iosif , Radu Elena , Caramitu Alina , Patroi Delia , Oprina Gabriela , Radermacher Ladislau , Mitrea Sorina
Published: February 2020

The structural and physicochemical changes that lead to the aging of the bituminous insulation of underground metallic pipelines were determined through various investigations (XRD, dielectric spectroscopy and thermal analysis � coupled techniques TG + DTA + DTG). The resistance to moulds of the bituminous insulation was evaluated by using specific microbiological methods and the dominant microbiological species found in the soil where the investigated bituminous material was exposed for 19 years were identified. The measurements carried out on samples taken from site showed that the bituminous material used in the anti-corrosive isolation of steel pipes has a very low resistance to microorganisms; thus, the dielectric qualities of bitumen deteriorate substantially (tg� increases 3-4 times). The exposure of the bituminous insulation to different climatic conditions and to solar radiation (UV-IR) leads to a decrease in the dielectric losses in the insulation and to an increase in crystallinity and thermo oxidative reactivity of bitumen, thus leading to a significant decrease in the material�s resistance to the action of fungi.
Essential Oil of Hypericum perforatum. The chemical composition and antimicrobial activity
Authors: Moleriu Lavinia , Jianu Calin , Bujanca Gabriel , Doros Gabriela , Misca Corina , Ilie Ovidiu Calin , Moleriu Radu Dumitru , Ilie Adrian Cosmin
Published: February 2020

The chemical composition and antimicrobial activity of the essential oil isolated by steam distillation from Hypericum perforatum L. (St John�s wort) growing wild in western Romania have been studied. The extraction yield was 0.41% (v/w) based on the dry plant material. The essential oil was analyzed by GC�MS, and a total of twenty-two components were identified. The major components were alpha-pinene (30.92%), beta-pinene (18.32%) and caryophyllene (15.26%). The antimicrobial activity of the H. perforatum essential oil was screened using the disk diffusion method against 7 common food-related bacteria and fungus. The analyzed EO possesses strong antimicrobial activity. Klebsiella pneumoniae and Pseudomonas aeruginosa were the most resistant species. The analyzed oil can represent an inexpensive natural source of antiseptic compounds, an alternative to synthetic preservatives.
Research on the Implementation of Cleaner Technologies for obtaining chemicals, in relation to the environment
Authors: Semenescu Augustin , Babis Claudiu , Iacobescu Gabriel , Rogobete Marius , Racuciu Ciprian , Nen Madlena , Chivu Oana Roxana , Ghimis Stefan Sorinel
Published: February 2020

Any technological process, through his specific, generates pollution in the environment, which ultimately has both short term but mainly long-term, harmful effects on human health. Today, when the technological degree is high in almost all areas of activity, it is impossible to completely avoid damage to the environment caused by the impact of technological processes, but it is possible to find some actions, having an effect towards reducing the negative impact in the sense of obtaining clean technology. Cleaner technology is, on the one side a goal pursued at international, european and national level, and on the other hand is a concept that covers many aspects of both the actual economic activities and of the environmental protection. This paper aims is on the one hand, to show how a tehnological process should be analyzed by highlighting the relationships between elements of the industrial process, according to some scheme, precisely in order to obtain so-called �clean technologies and on the other hand in the specific case of chemical pollution, to present most used evolutionary models on a chemical production forecast.
Adsorption of Chromium (VI) from Water Solution onto Polymeric Membrane Systems
Authors: Teodorescu Sofia , Ion Rodica Mariana , Nechifor Gheorghe , Bucurica Ioan Alin , Dulama Ioana Daniela , Stirbescu Raluca Maria , Stirbescu Nicolae Mihail
Published: February 2020

The toxic metals have shown a significant concentration increases in the superficial waters as a result of inappropriate residuals discharge by the municipality and industry. For chromium species can be clearly distinguished two oxidation states: Cr(VI) and Cr(III). Also, chromium�s hexavalent form, can be included in A group of human carcinogen for its mutagenic and carcinogenic characteristics. For Cr(VI) separation and recovering, different systems have been used, the chemical membranes being a valuable solution. In order to increase their efficacy, magnetite has been added, creating a complex system. The morphology and surface characteristics of the new systems (polysulfone (PSf) membrane in N-methyl-pyrrolidone (NMP) with magnetite) have been proved with the following types of analysis: FT-IR, Raman, SEM, OM and colorimetric determination of chromium. Magnetite incorporated in the polysulfone/NMP/Fe3O4 membrane is one new solutions used with success in retention of Cr (VI) from wastewater (85%).
Measurements of Aerosols and Trace Gases in Southern Romania
Authors: Dandocsi Alexandru , Nemuc Anca , Marin Cristina , Andrei Simona
Published: February 2020

An intensive measurement campaign was performed during September 2014 in southern Romania in two different locations: Magurele, Ilfov County and Turceni, Gorj County. This paper presents one case study with analysis of the aerosol properties from in-situ, passive remote sensing and active remote sensing measurements. A Multiwavelength Raman Lidar (RALI) provided one hour averaged vertical profiles of extinction and backscatter from the 532 nm and 1064 nm channels in Magurele. The UV scanning Lidar (MILI) provided one hour averaged backscattered and extinction vertical profiles for Turceni. Planetary Boundary Layer Height (PBLH) was calculated using the altitude of the maximum negative gradient of the range corrected signal. Mass concentrations for different aerosol species (organics, nitrate, sulphate, ammonium and chloride) were obtained from in-situ measurements using Aerosol Mass Spectrometer located in M�gurele and Aerosol Chemical Speciation Monitor (ACSM) located in Turceni.
Evaluation of Kinetic Parameters at the Transport of Indole-3-acetic Acid Through Bulk Liquid Membranes
Authors: Serban Ecaterina Anca , Diaconu Ioana , Ruse Elena , Badea Georgiana Ileana , Cuciureanu Adriana , Nechifor Gheorghe
Published: February 2020

Indole-3-acetic acid is a growth phytohormone considered the most important representative of auxin class. This paper presents the assessment of some kinetic parameters in the process of transport of indole-3-acetic acid taking into consideration the kinetic model of consecutive irreversible first order reactions. It was pursued the influence upon the process of parameters such as: feed phase concentration, stripping phase concentration in the presence of two type carriers: tributyl phosphate (TBP) and trioctylphosphine oxide (TOPO). Depending on these transport parameters were calculated kinetics parameters such as: pseudo-first-order apparent membrane entrance and exit rate constants, the maximum flux at the entrance and exit out of the membrane. The highest values of the transport flux is obtained in the presence of carrier trioctylphosphine oxide (TOPO) at the concentration in the feed phase of 10-4 mol/L indole-3-acetic acid and a concentration of 10--2mol/L NaOH in the stripping phase.
Comparative SEM Study on the Effect of Irrigating the Radicular Dentine with NaOCl and EDTA Through Conventional Techniques and Diode Laser
Authors: Onac Alexandra , Florescu Anamaria , Tudose Andreea Dana , Manea Stefan , Pangica Anna Maria , Ionescu Tudor Petru , Biclesanu Cornelia
Published: February 2020

Since there are not many references in literature about the action of diode laser 940nm on the dentin and root smear layer, the aim of this study is to evaluate and compare, through SEM analysis, the efficiency of the Sodium hypochlorite 2% (CERKAMED) - EDTA 17% (CERKAMED) combination, operated in the middle and apical third of the root, by conventional syringe needle EndoEze and diode laser 940nm treatment. The study was performed on 40 single-root teeth, which were divided into two groups: group A consisting of 20 teeth, for which irrigation was performed only with the syringe and a top open side needle EndoEze Irrigator, resulting in a turbulence moving upward which efficiently irrigates the root canal and prevents periapical water solution; and group B consisting of 20 teeth, which benefited from irrigation associated with diode laser 940nm treatment. In the middle third and apical third smear layer removal was more effectively achieved when teeth benefited from irrigation associated with the laser diode treatment. In Endodontics, Diode laser is a good decontamination system, with biostimulation effect, which is important in healing the periapicale area. Significantly better results were obtained using 940nm laser diode associated with successive irrigation with 2% NaOCl and 17% EDTA, as compared to the conventional technique performed by syringe and lavage needle EndoEze Irrigator (Ultradent).
Impact of Medication with Diclofenac Sodium vs. Etoricoxibum in Patients with Inflammatory Reumatic Pathology, Prosthetic Complications and Algo-dysfunctional Syndrome
Authors: Checherita Laura Elisabeta , Rezus Elena , Leon Maria Magdalena , Stamatin Ovidiu , Carausu Elena Mihaela
Published: February 2020

Affections of temporomandibular joint (TMJ) can lead to imbalances and disfunctions named algodisfunctional syndrome. One of the affections that we will take into consideration in this study is the temporal-mandibular arthrosis, which is, in fact, the frequent pathology at this level, and to which we will measure the pain before and after the administration of the anti-inflammatory therapy: Etoricoxib vs. Dyclofenac.The important objective of this study is to investigate this type of drug treatment over TMJ. The class of drug called non-steroidal anti-inflammatory drugs (NSAIDs)�so called to distinguish this class of drug from steroids, which have similar but additional effects�make NSAIDs one of frequently used drugs for the symptomatic treatment of many common conditions. Etoricoxib is clinically effective in the therapy of TMJ providing a magnitude of effect comparable to that of the maximum recommended daily dose of Diclofenac.
Process Control of Isobutene Dimerization Plant
Authors: Dragnea Petru , Bildea Costin Sorin
Published: February 2020

The development and evaluation of the dynamic flowsheet for isobutene dimerization process is presented. The steps for developing the dynamic model, the control scheme and the controllers tuning are shown and the response of the system to different disturbances is evaluated. The results are presented in graphical form. Methods for changing the plant throughput and for controlling the product specification when the feed composition varies are presented.
Hyaluronic Acid and Chondroitin Sulfate Viscosupplementation in Severe Arthropathy of Hemophilic Patients
Authors: Sirbu Paul Dan , Tudor Razvan , Badulescu Oana Viola
Published: February 2020

Type A hemophilia is a hereditary coagulopathy caused by coagulation factor VIII deficiency, clinically characterized by hemorrhagiparous phenomena of different intensity, depending on disease severity or on the intensity of the injury suffered by the patient. The severe forms of the condition may become complicated by spontaneous sometimes even life-threatening bleeding, in the absence of factor VIII substitution treatment. Considerable bleeding may occur at the intraarticular, intramuscular or mucosa level, whereas life-threatening bleeding may occur anywhere in severe injuries. Two types of hemorrhagiparous are specific to the disease and are also the most common: hemarthroses and hematomas. As far as hemarthroses are concerned, each joint hemorrhage episode causes a topical disorder, which predisposes to recurrence, with the onset over time of the main chronic complication of this condition, hemophilic athropathy, which progresses slowly throughout the patient�s life and generates severe sequellae (ankylosis). This paper aims at emphasizing the importance of viscosupplementation by the injection of hyaluronic acid and chondroitin sulfate in the joints of hemophilic patients with severe athropathy, with a view to improving the locomotor function, to reducing the number of bleeding episodes and joint pain.
Investigation of Reaction Products Obtained from Ignition Process of n-Heptane / Air Mixtures on Free Hot Surface
Authors: Mitu Maria , Brandes Elisabeth
Published: February 2020

The ignition behaviour at ambient pressure (p0 between 98.0 kPa and 101.3 kPa) of different concentrations of homogenous n-heptane/air mixtures on stainless steel hot surface as well as the composition of the reaction products have been investigated. Although all reaction products are present in each burned n-heptane/air mixture, a correlation between the lowest ignition temperature and the quantitve composition of the reaction products is not obvious.
Management of Toxic Packaging Waste Related to Environmental Protection in Iasi and Neamt Counties
Authors: Costuleanu Carmen Luiza , Boldureanu Gabriela , Andruseac Gabriela Gladiola
Published: February 2020

The aim of the present study was to estimate and compare the toxic packaging waste generation in two urban areas of Iasi (A) and Piatra Neamt (B) counties, in a close relationship with the management of removal and processing. Piatra Neamt was chosen because it is known to have a developed infrastructure for selective sorting and collection of municipal solid waste since 2001, implemented using European funds. On the other part, the center of Iasi city was chosen because the selective sorting of municipal solid waste was really implemented only in this area. There exist no significant differences between the generated total waste amounts in A and B studied areas. The same time, no significant differences between the generated packaging waste average quantities in A and B areas were found. The clear result of this study is that the generated packaging waste represents 32.62% as average when compared to generated total waste in area A and 37.15% in area B. When comparing the fractions of generated total waste in the two areas of study the results are really surprisingly. Since it is well known that Piatra Neamt developed the first integrated system of selective collection of household waste, totally functional starting with 2001. When we are comparing the fractions of generated total waste, the results are not significantly different in the two areas. For sure, there are higher rates for selective collection and sorting of paper/cardboard, plastics, glass and organic waste in area B, but not really significant. Such results could be explained solely by the existence of a similar degree of education and commitment regarding the environmental protection in both studied areas. Moreover, we tried to have an estimation of the management effort of local authorities to remove the generated total waste or its selective fractions from the two studied areas. This was a very difficult challenge. For the moment, our conclusions are that for both cities the management efforts are almost the same, despite the selective sorting and collection of some fractions of generated total waste in area B (Piatra Neamt). The simple conclusion could be that the management efforts of removal are lower in Iasi city starting from the efficiency of the processes.
Corrosion Behaviour and Surface Modification of Intra-orally Engaged Orthodontic Ni-Ti Wires
Authors: Martha Krisztina , Ogodescu Alexandru , Bica Cristina Ioana , Varlam Cristina Molnar
Published: February 2020

Almost all orthodontic wires suffer from corrosion as they are intra-orally engaged. This chemical structure alteration appears on the surface of these wires, surface topography can be easily visualised with scanning electron microscope method. The aim of our study was to assess the intraoral corrosion of the retrieved orthodontic Ni-Ti archwires. Archwire retrieval procedure yielded approximately 30 retrieved wires, placed intra-orally for 1-5 months. SEM analysis was performed and surface changes were interpreted. Our SEM results showed, that surface corrosion and pitting can be seen on the surface of retrieved Ni-Ti wires, the depth of corrosion depends on the time wires have been engaged in the oral cavity. With regards of metal liberation consequently surface corrosion, practitioners should be avare of these chemical changes which can affect the resistence of the orthodontic appliance and patient health.
Assessment of the Structure and Core Losses Pertaining to Magnetic Toroids Made from Powder and Cast in One Production Step
Authors: Nabialek Marcin , Fuzer Jan , Dakova Luboslava , Pietrusiewicz Pawel
Published: February 2020

This paper presents the results of a comparison of two methods for the preparation of permalloy-type material. The nominal blend composition was Ni80-Fe14.7-Mo4.5-Mn0.5-Si0.3. Samples were prepared in the form of toroids using powder metallurgy and an induction casting method. The following measurements were carried out on samples: computer tomography, VSM, XRD, and measurement of the total magnetic losses at different frequencies and the magnetic induction. Both technologies were found to create a crystalline material with similar phases. The sample prepared by the induction casting method exhibited high coercivity, low magnetization saturation and high excess losses in comparison with the sample that had been subjected to a 24h and 120h milling duration.