Liquid and vapour phase of lavandin (Lavandula × intermedia) essential oil: chemical composition and antimicrobial activity

Essential oils from Lavandula genus and the obtained hybrids are widely used for different purposes such as perfume production in the cosmetic field and for its biological properties. This is the first study on the liquid and vapour phase of Lavandula × intermedia “Grosso” essential oil grown in the Lazio Region, Italy, investigated using headspace coupled to gas chromatography and mass spectrometry (HS-GC/MS). The results showed the most abundant components were linalool and linalyl acetate, followed by 1,8-cineole and terpinen-4-ol, while lavandulyl acetate and borneol were identified as minor compounds, maintaining the same proportion in both the liquid and vapour phase. Furthermore, we tested lavandin liquid and vapour phase essential oil on gram-negative bacteria (Escherichia coli, Acinetobacter bohemicus, and Pseudomonas fluorescens) and gram-positive bacteria (Bacillus cereus and Kocuria marina)

Chemical investigation of a biologically active schinus molle L. leaf extract

The pepper tree Schinus molle L. is an evergreen ornamental plant belonging to the Anacardiaceae family, native to South America and widespread throughout the world. It has biological activities and is used in folk medicine. This paper aims to contribute to a deeper knowledge of its chemical composition and biological properties. S. molle leaf extracts were obtained by sequential extraction with solvents of different polarities and subsequently tested on the HL-60 human leukaemia cell line to define a possible cytotoxic activity. Among the investigated extracts, the petroleum ether extract revealed a high cytotoxic activity, and its chemical composition was further investigated. By a silica column chromatography, eight fractions were obtained, and their compositions were determined by GC-MS analysis. Compounds and relative abundance differed widely among the fractions; sesquiterpenes resulted the main component and alcoholic sesquiterpenes the most abundant

Effect of gaseous ozone treatment on the aroma and clove rot by Fusarium proliferatum during garlic postharvest storage

It is known that garlic bulbs preserved with traditional methods undergo considerable losses, ranging from 25 to 40%. A frequent cause of these losses is associated with the development of pathogenic fungi, such as those of the genus Fusarium. The effect of ozone on post-harvest garlic bulbs was evaluated. Garlic cloves inoculated with Fusarium proliferatum F21 and F22 strains, were exposed to a continuous gaseous ozone flow (2.14 μg m−3), during 4 days, 20 h a day. After ozone-treatment, the garlic samples were moved at 22 °C to mimic retail conditions (shelf life). The changes in several quality parameters such as fungal decay and aroma were evaluated on garlic samples, as whole bulbs, cloves with and without tunic, through a sensorial descriptive test, SPME analysis in GC/MS and microbiological approaches. The data collected showed that ozone treatment did not affect the aromatic profile of garlic. A significant detrimental effect of ozone treatment on garlic decay was observed. Our results encourage the use of gaseous ozone treatment for containing garlic fungal decay during its storage

Estudio en 21 cm de la bolsa de carbón

Se realizó un nuevo intento para detectar hidrógeno neutro en la región de la Bolsa de Carbón mediante observaciones en 21 cm. El resultado fue negativo debido a que las fluctuaciones de fondo son muy grandes en esta región, pero la presencia de hidrógeno puede ser fácilmente detectada a partir de valores normales delos cocientes gas-polvo, y de la temperatura de excitación.Asociación Argentina de Astronomí

Estudio en 21 cm de los brazos interiores de la Via Láctea mediante la aplicación de un modelo observacional de distancias

An observational distances model has been determined based on the observations at the Instituto Argentino de Radioastronomia. The results are shown in diagrams that relate the sun relative radial velocity with the heliocentric distance in the range of galactic longitudes between 297° and 342° at constant intervals of 3° ( b = 0 ). Typical examples of these are given in Figure 1. From the comparison of this model curves and the ones of the homogeneous mass distribution, it is possible to determine the number of more important structures in the fourth quadrant (v < 0 ) and its tangential points. Those galactic longitudes has been compared with those from the continuum. There is a good agreement between them ( Table I). The galactic structure in the fourth quadrant was studied applying this model. There were found 26 concentrations of neutral hydrogen that are shown in (l, b ) diagrams in Figures 4. Since, for negative velocities it is not possible to give a single value of the distance for each concentration, a comparison was made with optical objects, Weaver’s predictions for the occidental galactic hemisphere and Lin’s model. The conclusions are shown in Figures 7 and 8.Asociación Argentina de Astronomí

Análisis estadístico de 123 concentraciones de hidrógeno neutro

Con el radiotelescopio de 30 m del Instituto Argentino de Radioastronomía, se llevó a cabo un relevamiento del cielo de la zona 270° ≤ l ≤ 310°, 2 ≤ b ≤ —7°. A partir de estas observaciones, se confeccionó un Atlas de la zona que consta de 40 diagramas de distribución de temperaturas en función de la velocidad y la latitud galáctica y 36 diagramas de distribución de temperaturas en función de la velocidad y la longitud galáctica.Asociación Argentina de Astronomí

Estudio en 21 cm de los brazos interiores de la Via Láctea mediante la aplicación de un modelo observacional de distancias

An observational distances model has been determined based on the observations at the Instituto Argentino de Radioastronomia. The results are shown in diagrams that relate the sun relative radial velocity with the heliocentric distance in the range of galactic longitudes between 297° and 342° at constant intervals of 3° ( b = 0 ). Typical examples of these are given in Figure 1. From the comparison of this model curves and the ones of the homogeneous mass distribution, it is possible to determine the number of more important structures in the fourth quadrant (v < 0 ) and its tangential points. Those galactic longitudes has been compared with those from the continuum. There is a good agreement between them ( Table I). The galactic structure in the fourth quadrant was studied applying this model. There were found 26 concentrations of neutral hydrogen that are shown in (l, b ) diagrams in Figures 4. Since, for negative velocities it is not possible to give a single value of the distance for each concentration, a comparison was made with optical objects, Weaver’s predictions for the occidental galactic hemisphere and Lin’s model. The conclusions are shown in Figures 7 and 8.Asociación Argentina de Astronomí

Estudio en 21 cm de los brazos interiores de la Via Láctea mediante la aplicación de un modelo observacional de distancias

An observational distances model has been determined based on the observations at the Instituto Argentino de Radioastronomia. The results are shown in diagrams that relate the sun relative radial velocity with the heliocentric distance in the range of galactic longitudes between 297° and 342° at constant intervals of 3° ( b = 0 ). Typical examples of these are given in Figure 1. From the comparison of this model curves and the ones of the homogeneous mass distribution, it is possible to determine the number of more important structures in the fourth quadrant (v < 0 ) and its tangential points. Those galactic longitudes has been compared with those from the continuum. There is a good agreement between them ( Table I). The galactic structure in the fourth quadrant was studied applying this model. There were found 26 concentrations of neutral hydrogen that are shown in (l, b ) diagrams in Figures 4. Since, for negative velocities it is not possible to give a single value of the distance for each concentration, a comparison was made with optical objects, Weaver’s predictions for the occidental galactic hemisphere and Lin’s model. The conclusions are shown in Figures 7 and 8.Asociación Argentina de Astronomí

Análisis estadístico de 123 concentraciones de hidrógeno neutro

Con el radiotelescopio de 30 m del Instituto Argentino de Radioastronomía, se llevó a cabo un relevamiento del cielo de la zona 270° ≤ l ≤ 310°, 2 ≤ b ≤ —7°. A partir de estas observaciones, se confeccionó un Atlas de la zona que consta de 40 diagramas de distribución de temperaturas en función de la velocidad y la latitud galáctica y 36 diagramas de distribución de temperaturas en función de la velocidad y la longitud galáctica.Asociación Argentina de Astronomí

Estudio en 21 cm de la bolsa de carbón

Se realizó un nuevo intento para detectar hidrógeno neutro en la región de la Bolsa de Carbón mediante observaciones en 21 cm. El resultado fue negativo debido a que las fluctuaciones de fondo son muy grandes en esta región, pero la presencia de hidrógeno puede ser fácilmente detectada a partir de valores normales delos cocientes gas-polvo, y de la temperatura de excitación.Asociación Argentina de Astronomí