Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Niesko Pras"'
Publikováno v:
BMJ Open, 5(12):e009213. BMJ PUBLISHING GROUP
BMJ Open
BMJ Open
INTRODUCTION: Older people often use medications with anticholinergic or sedative side effects which increase the risk of falling and worsen cognitive impairment. The Drug Burden Index (DBI) is a measure of the burden of anticholinergic and sedative
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::086a34133ae93246548c6955ebdfb9dd
https://research.rug.nl/en/publications/1933a410-61c0-4056-bd0c-d5baf686efa8
https://research.rug.nl/en/publications/1933a410-61c0-4056-bd0c-d5baf686efa8
Publikováno v:
Planta Medica, 69(8), 739-744. GEORG THIEME VERLAG KG
The in vitro cell suspension culture of Linum flavum is able to convert high amounts of the 2,7'-cyclolignan deoxypodophyllotoxin into 6-methoxypodophyllotoxin 7- O-glucoside. We studied this conversion in detail by monitoring the intermediates and s
Publikováno v:
University of Groningen
In this paper an overview is given of qualitative and quantitative methods of analysis used for valepotriates. Methods like spectophotometry, titrimetry, TLC, GC, HPLC, MS, CE as well as p-SFC have been applied. Today HPLC is the method of choice. Th
Publikováno v:
Planta Medica, 67(9), 858-862. GEORG THIEME VERLAG KG
A new GC-MS method for monitoring lignans was developed to study the variation in plants and elucidate the biosynthetic steps. A simple and fast extraction procedure for lyophilised plant material was developed, giving a lignan-rich extract. A GC-MS
Autor:
Herman J. Woerdenbag, Rein Bos, Heidi E. van Meeteren, Jacoba J.J. Baarslag, Lolkje T. W. de Jong-van den Berg, Niesko Pras, Gladys do Rego Kuster, Royce R. L. Petronia, George I. Vos
Publikováno v:
Journal of Essential Oil Research. 12:667-671
The volatile constituents from aerial and underground parts of Croton flavens L, a medicinal plant from Curacao, were investigated by GC and GC/MS (El) analysis. The various plant parts yielded 0.27-0.50% (v/w) essential oil on a dry weight basis. Th
Publikováno v:
Journal of Essential Oil Research. 12:313-316
The essential oils obtained from air-dried subterranean parts of Valeriana officinalis ssp. collina (Wallr.) Nyman (Valerianaceae), ‘Shipka,’ was analyzed by GC and GC/MS, and 62 components were identified. The oil yield, collected in plants grow
Publikováno v:
Planta Medica, 66(1), 57-62. GEORG THIEME VERLAG KG
The time course of the levels of artemisinin, its biosynthetic precursors and the biosynthetically related sesquiterpenes was monitored during a vegetation period of Artemisia annua plants of different geographical origin. Considerable differences in
Publikováno v:
Planta Medica, 65(8), 723-728. GEORG THIEME VERLAG KG
Using colchicine we induced tetraploidy in Artemisia annua L. plants. During a vegetation period we monitored the time course of the levels of artemisinin, its direct precursors, the biosynthetically related sesquiterpenes and the essential oil conte
Publikováno v:
Journal of Biotechnology. 70:85-88
Six ascidian species from the Dutch North Sea coast were screened for cytotoxic activity, Freeze-dried biological material was extracted with solvents of different polarity followed by determination of the cytotoxicity. The most active extracts were
Autor:
Niesko Pras, G. B. Elyakov, G. V. Malinovskaya, Albert Koulman, Herman J. Woerdenbag, L. N. Atopkina, Pierre Potier, N. I. Uvarova
Publikováno v:
Scopus-Elsevier
Planta Medica, 65(1), 30-34. GEORG THIEME VERLAG KG
Planta Medica, 65(1), 30-34. GEORG THIEME VERLAG KG
The cytotoxicity of natural glycosides from Ginseng, semisynthetic analogues and related triterpenes of the dammarane series, isolated from the leaves of the Far-East species of the genus Betula was studied in order to elucidate structure-activity re