Browsing by Author "Brito, J."
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- Accessory articulation of elongated anterior transverse process: a rare anatomical variant of the cervical spine depicted with CT and post-processing techniquesPublication . Bilreiro, C.; Saraiva, J.; Duarte Silva, L.; Brito, J.; Grande, P.There are several described anatomical variants of the cervical spine, ranging from common to extremely rare, which may have different clinical implications. We present the case of an extremely rare anatomical variant of the cervical spine, in a symptomatic patient, consisting of a unilateral accessory articulation between the 5th and 6th cervical vertebrae, due to elongated anterior transverse processes. Our search found only three cases in the English literature describing similar findings to the case here reported. Our case is, to our knowledge, the first report of this anatomical variant imaged with computed tomography including post-processing images (volume rendering technology and multiplanar reformations), which contribute greatly to a better understanding and depiction of the anatomical variant.
- Essential oils of Portuguese Thymus mastichina (L.) L. subsp mastichina grown on different substrates and harvested on different datesPublication . Miguel, Maria Graça; Guerrero, Carlos; Rodrigues, H.; Brito, J.; Duarte, F.; Venancio, F.; Tavares, R.The effects of harvesting date and different substrates on the yield and chemical composition of the essential oils of Portuguese Thymus mastichina (L.) L. subsp. mastichina were compared with samples grown in pots. The best oil yields were obtained in June (3.2, 3.6 and 4.9% in the local sandy soil, in non-fertilized peat, and in fertilized peat, respectively). The essential oils were dominated by 1,8-cineole, the highest concentration of which was detected in June (58.6%) in samples kept in non-fertilized peat, and the lowest values were from plants growing in fertilized peat during April and June (45.1%). The remaining samples always reached the highest percentages in October (around 54% in both oil samples), although the concentration profile over time was similar in every sample. Concerning the monoterpene hydrocarbons, a-pinene, camphene, sabinene and P-pinene were the most significant components. While the amounts of alpha-pinene tended to decrease from April to June, for P-pinene such tendency was observed from October to January, independently of the growing material used. Amounts of camphene, being similar to those of alpha-pinene, decreased successively from October to April. Elemol and intermedeol were the most representative sesquiterpene components, although the concentrations never exceeded 2.2% and 1.3%, respectively. The results obtained in this work suggest that the harvesting dates of Portuguese T mastichina influence oil yields and their chemical compositions much more than the different growing media used, although a higher oil yield was obtained with the fertilized growing material.
- Essential oils of Rosmarinus officinalis L., effect of harvesting dates, growing media and fertilizersPublication . Miguel, Maria Graça; Guerrero, Carlos; Rodrigues, H.; Brito, J.; Duarte, F.; Venancio, F.; Tavares, R.The effects of the harvesting date, growing media and fertilizers on the yield and chemical composition of the essential oils of Rosmarinus officinalis L. maintained in pots were evaluated. The highest oil yield was always obtained in June, being superior or equal to 1 %. Myrcene was the major component present in the essential oils with concentrations always exceeding 20 %, independent on the factors studied. 1,8-Cineole (8.0-12.2 %), a-pinene (8.8-16.5 %) and, in some instances, camphor (4.4-14.1 %) could be also detected in considerable amounts, however never exceeding the myrcene percentages. The amounts of camphor (4.4-8.5 %) were always inferior to the 1,8-cineole levels (8.8-11.8 %) in the local sandy soil regardless the fertilization used. Generally, the lowest levels of myrcene and verbenone were observed during January and April while the highest amounts of 1,8-cineole was observed in April or June. The yield and the chemical composition of the rosemary oils seemed to be more sensitive to the temperature, photoperiod and collection period than to the growing media material or to the fertilization used.