RESUMEN
In order to compare the differences of 35 Menthae Herba samples collected on the market and at producing areas, the contents of six total terpenoids, the essential oil and chromatographic fingerprints were analyzed, which provided evidences for drawing up the commodity specifications and grading criteria of Menthae Herba. GC-MS method was used to analyze the chemical constituents of 35 different samples. The chromatographic fingerprints obtained by using GC were then evaluated by similarity analysis, hierarchical clustering analysis and principal component analysis. The relativity between the content of six terpenoids and the essential oil were studied. In this study, the chemical profiles of 35 samples from different producing areas had significant disparity. All samples collected in the report could be categorized into four chemical types, L-menthol, pulegone, carvone and L-menthone, but the chemical profiles had no relationship with the areas. The chromatographic fingerprints of the samples from different types were dissimilar, while the different producing areas were difficult to be separated. It was indicated that the content of volatile oil was positively correlated with the content of L-menthol and the sum of six total terpenoids. The content of the essential oil, L-menthol and the sum of six total terpenoids of Menthae Herba were considered as one of the commercial specifications and grading criteria. These results in the research could be helpful to draw up the commercial specification and grading criteria of Menthae Herba from a view of chemical information.
Asunto(s)
Análisis por Conglomerados , Cromatografía de Gases y Espectrometría de Masas , Mentha , Química , Aceites Volátiles , Análisis de Componente Principal , TerpenosRESUMEN
Alzheimer's disease (AD) is a devastating late-life dementia that produces progressive loss of memory and mental faculties in elderly people. It is important to identify the earliest evidence of AD and to monitor the development of this disease for us to make positive response to its management. Magnetic resonance imaging (MRI) is powerful to image the tissue or organ without damnification. MRI can be employed to diagnose the early AD development and monitor the key biomarker development in AD. MRI may be helpful not only in diagnosing early AD, but also in evaluating its development. This article reviews the progress of MRI on the diagnosis and detection of AD, and makes comments on its therapeutic application.
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Animales , Humanos , Enfermedad de Alzheimer , Diagnóstico , Metabolismo , Patología , Terapéutica , Atrofia , Biomarcadores , Metabolismo , Imagen por Resonancia Magnética , Redes y Vías MetabólicasRESUMEN
<p><b>OBJECTIVE</b>To systemically analyze the differentially expressed genes from normal mucosa and carcinoma of colon obtained by SSH method.</p><p><b>METHODS</b>An automatic platform for the analysis of nucleotides based on Linux was constructed, and one of the three subtracted libraries from SSH (T -N) was systematically analyzed by this platform. Part of the results was verified by semi- quantity RT-PCR.</p><p><b>RESULT</b>The automatic platform for the analysis of nucleotides based on Linux was successfully constructed. There were 15 contigs from the subtracted T-N libraries, among which 2 had no match with known genes in the GenBank. The expressions of genes Homo Sapiens thymosin beta 4 (THY) and Homo Sapiens HbxAg transactivated protein 2 (XTP) had trends of increase with the progress of normal tissue-adenoma-adenocarcinoma when verified by semi- quantity RT-PCR.</p><p><b>CONCLUSION</b>Linux-based automatic platform provides an efficient way to systematically analyze the nucleotide sequences, which may be used in study on the mechanism of colorectal carcinogenesis.</p>
Asunto(s)
Femenino , Humanos , Masculino , Colon , Metabolismo , Neoplasias del Colon , Genética , Biología Computacional , Perfilación de la Expresión Génica , Mucosa Intestinal , Metabolismo , Reacción en Cadena de la Polimerasa de Transcriptasa InversaRESUMEN
Severe acute respiratory syndrome(SARS), caused by SARS- associated coronavirus(SCV), is the first severe infectious disease in this century. SARS is pathologically characterized by interstitial exudative inflammation of lung with the formation of hyaline membrane in acute phase. Haemorrhagic inflammation exists in extrapulmonary organs. Clinical diagnosis is a dynamic process and includes the suspected case, probable case and definite case. Diagnostic standard of SARS will be revised with further understanding of the disease. Chinese term of SARS has been recommended in the paper.