1,721,111 research outputs found
Антимикробная активность эфирного масла пупавки благородной (Chamaemelum nobile (L.) All)
Full text linkChamaemelum nobile (L.) All. так называемая пупавка благородная или римская ромашка, - многолетнее растение семейства сложно-цветные, Астровые. Цветки римской ромашки содержат 0,6–2,4 % эфирного масла. Состав масла сложный, к настоящему времени идентифицировано более 140 компонентов. Минимальную ингибирующую концентрация образцов эфирного масла пупавки благородной определяли методом серийных разведений этанольных растворов эфирных масел в питательном бульон
Оценка антимикробной активности экстрактов из цветочной массы пупавки благородной (Chamaemelum nobile L.)
Full text linkВ работе проведен анализ антимикробной активности водно-спиртовых экстрактов из цветочной массы пупавки благородной (Chamaemelum nobile L.). Чувствительными к ингибирующему действию полученных экстрактов оказались грамположительные бактериальные культуры
Artificial neural network (ANN) approach for predicting concrete compressive strength by SonReb
No full textThe compressive strength of concrete is one of most important mechanical parameters in the performance assessment of existing reinforced concrete structures. According to various international codes, core samples are drilled and tested to obtain the concrete compressive strengths. Non-destructive testing is an important alternative when destructive testing is not feasible without damaging the structure. The commonly used non-destructive testing (NDT) methods to estimate the in-situ values include the Rebound hammer test and the Ultrasonic Pulse Velocity test. The poor reliability of these tests due to different aspects could be partially contrasted by using both methods together, as proposed.in the SonReb method. There are three techniques that are commonly used to predict the compressive strength of concrete based on the SonReb measurements: computational modeling, artificial intelligence, and parametric multi-variable regression models. In a previous study the accuracy of the correlation formulas deduced from the last technique has been investigated in comparison with the effective compressive strengths based on destructive test results on core drilled in adjacent locations. The aim of this study is to verify the accuracy of Artificial Neural Approach comparing the estimated compressive strengths based on NDT measured parameters with the same effective compressive strengths. The comparisons show the best performance of ANN approach
Изучение антимикробной активности и комплекса биологически активных веществ экстрактов пупавки благородной (Chamaemelum nobile L.)
No full textЦель работы - изучение антимикробной активности и проведение качественного и количественного анализа биологически активных веществ экстрактов пупавки благородной (Chamaemelum nobile L.).
В ходе выполнения научно-исследовательской работы разработана методика экстракции компонентов из пупавки благородной и определены оптимальные параметры экстракции. С помощью метода высокоэффективной жидкостной хроматографии в водно-спиртовом экстракте пупавки благородной идентифицированы кверцетин 3-D-гликозид, кверцетин З-О-рамнозид, космозиин
Evaluation du pouvoir antimicrobien de plusieurs extraits Polyphénolique de deux espèces végétales Chamaemelum nobile L. et Matricaria chamomilla L.
No full text44 p.: ill. ; 30 cmLes travaux présentés dans cette étude visent à la valorisation des deux plantes médicinales de la famille des Astéracée à savoir Chamaemelum nobile L. et Matricaria chamomilla L., en les caractérisant par une évaluation des activités antimicrobiennes de différents extraits polyphénoliques. Ces deux plantes sont très appréciées pour leurs teneurs en métabolites secondaires. Les extraites polyphénoliques obtenues par macération ont monté un rendement d’extraction de 8.5%, 0.84% et 10% pour Chamaemelum nobile L. et de 6%, 0.64% et 9.92% pour Matricaria chamomilla L., respectivement l’extrait méthanolique, chloroformique et aqueux. La teneur totale en polyphénol a été déterminée en utilisant le réactif de Folin-Ciocalteu est d’ordre 0.017 mg/ml et 0.016 mg/ml pour Matricaria chamomilla L. et Chamaemelum nobile L. respectivement.
L’activité antimicrobienne des trois extraits polyphénolique été déterminée sur six souches microbiennes, selon la méthode de diffusion de disque et a donné des zones d’inhibition variant de 7 à 15 mm. Donc les trois extraits polyphénoliques ont une activité moyennement inhibitrice et ils ont réagi positivement au moins sur une des souches microbiennes testées sauf la flore fongique, ainsi que l’extrait méthanolique de Matricaria chamomilla L. a une forte activité vis-à-vis de Pseudomonas aeruginosa par une zone d’inhibition estimé de 22.5mm
Formulation of cracked beam element for structural analysis
No full textIn this paper, a finite element for a cracked prismatic beam is developed. This element may be used in any matrix structural analysis. This paper details the derivation of the interpolation functions for a cracked Timoshenko beam finite element. These shape functions for rotational and translational displacements are also used to develop the consistent mass matrix for the cracked beam element. The crack effect on the stiffness matrix, as well as on the the consistent mass matrix, is investigated and graphically represented
Morfología y anatomía comparadas de Chamaemelum nobile (L.) All., Chamomilla recutita L. Rausch. y especies adulterantes
No full textSe ha estudiado la morfología y anatomía comparadas de Chamaemelum nobile (L.) All. (Anthemis nobilis L.) y Chamomilla recutita (L.) Rausch. (Matricaria chamomilla L.) a los efectos de su reconocimiento farmacobotánico como drogas enteras o pulverizadas y la detección de sus adulterantes más frecuentes: Chamaemelurn mixtum (L.) All.,Anthamis cotula L., Anthemis arvensis L., Chamomilla suaveolens (Pursh) Rydb., Matricaria perforata Mérat y Tanacetum ~parthenium (L.) Sch. Bip. Los caracteres morfológicos y anatómicos de los capítulos son suficientemente distintivos como para permitir la identificación de cada especie, aún en las drogas fragmentadas. Se incluyen claves para la determinación de filarias, flores marginales, páleas, flores del disco y aqueniosComparative morphology and anatomy of Chamaemelum nobile (L.) Al (Anthemis nobilis L.) and Charnomilla recutita (L.) Rausch. (Matricaria chamomilla L.) so as their related species Chamaemelum mixturn (L.) All., Anthemis cotula L., Anthernis arvensis L., Chamomilla suaveolens (Pursh) Rydb., Matricaria perforata Mérat and Tanacetum parthenium (L.) Sch. Bip. are studied in relation with their pharmacobotanic recognition. The morphological and anatomical characters are sufficiently as to allow identification of each species, even in powdered drugs. Keys are included for the identification of phyllaries, ray florets, pales, disc florets and achenes.Colegio de Farmacéuticos de la Provincia de Buenos Aire
Morfología y anatomía comparadas de Chamaemelum nobile (L.) All., Chamomilla recutita L. Rausch. y especies adulterantes
No full textSe ha estudiado la morfología y anatomía comparadas de Chamaemelum nobile (L.) All. (Anthemis nobilis L.) y Chamomilla recutita (L.) Rausch. (Matricaria chamomilla L.) a los efectos de su reconocimiento farmacobotánico como drogas enteras o pulverizadas y la detección de sus adulterantes más frecuentes: Chamaemelurn mixtum (L.) All.,Anthamis cotula L., Anthemis arvensis L., Chamomilla suaveolens (Pursh) Rydb., Matricaria perforata Mérat y Tanacetum ~parthenium (L.) Sch. Bip. Los caracteres morfológicos y anatómicos de los capítulos son suficientemente distintivos como para permitir la identificación de cada especie, aún en las drogas fragmentadas. Se incluyen claves para la determinación de filarias, flores marginales, páleas, flores del disco y aqueniosComparative morphology and anatomy of Chamaemelum nobile (L.) Al (Anthemis nobilis L.) and Charnomilla recutita (L.) Rausch. (Matricaria chamomilla L.) so as their related species Chamaemelum mixturn (L.) All., Anthemis cotula L., Anthernis arvensis L., Chamomilla suaveolens (Pursh) Rydb., Matricaria perforata Mérat and Tanacetum parthenium (L.) Sch. Bip. are studied in relation with their pharmacobotanic recognition. The morphological and anatomical characters are sufficiently as to allow identification of each species, even in powdered drugs. Keys are included for the identification of phyllaries, ray florets, pales, disc florets and achenes.Colegio de Farmacéuticos de la Provincia de Buenos Aire
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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