Search results for "Herb"

Effects of radiation in accretion regions of classical T Tauri stars

2019

Context. Models and observations indicate that the impact of matter accreting onto the surface of young stars produces regions at the base of accretion columns where optically thin and thick plasma components coexist. Thus, an accurate description of these impacts is necessary to account for the effects of absorption and emission of radiation. Aims. We study the effects of radiation emerging from shock-heated plasma in impact regions on the structure of the pre-shock down-falling material. We investigate whether a significant absorption of radiation occurs and if it leads to a pre-shock heating of the accreting gas. Methods. We developed a radiation hydrodynamics model describing an accreti…

Karl I. Stuart bei Andreas Gryphius und Heinrich Heine: Gegensätzliche Herrscherbilder

2018

Karl I. Stuart, Herrscher oder Märtyrer? Die Darstellung von Herrscherfiguren, Königen und Führern in der Literatur ist überaus mannigfaltig und abhängig davon, welche Bedeutung ihnen in der Geschichte bzw. in einer bestimmtem Zeitspanne zugemessen wird. Zwar begegnen wir in diesem Genre durchaus oft dem Bild des Tyrannen mit grenzenloser Machtbefugnis, weitaus häufiger jedoch treten uns auch hier Menschen, Persönlichkeiten mit höchst ausdifferenzierten Charakterzügen entgegen. Dies lässt sich auch an der Figur von Karl I. Stuart zeigen, der am 30. Januar 1649 infolge einer Verschwörung des englischen Parlaments enthauptet und als erster unter den englischen Monarchen öffentlich hingerichte…

USE OF HERBAL REMEDIES AMONG CANCER AND TRANSPLANT PATIENTS IN THE TOWN OF PALERMO, SICILY

2010

Concomitant use of herbal remedies may lead to toxicity or failure of conventional therapies in different patients. The objectives of this survey were to assess: (1) the prevalence of the use of vegetal remedies by cancer and transplanted patients (2) the level of communication about such use to the physicians (3) whether such use might be associated to adverse reactions or interactions with conventional drugs. The study was carried out on 100 consecutive cancer patients attending the outpatient medical oncology clinic of the University Hospital "P. Giaccone", Palermo and on other 100 transplanted patients who were hospitalized or followed up at ISMETT, Palermo. Another group was composed o…

Sex-specific patterns of antagonistic and mutualistic biotic interactions in dioecious and gynodioecious plants

2013

a b s t r a c t A major transition in flowering plants has been the evolution of separate sexes from hermaphroditism via gynodioecy which is considered to be the most important route. Biotic interactions, both antagonist and mutualistic, have been proposed to influence this transition which is generally accompanied by the evolution of sexual dimorphism in secondary sexual traits. While some researchers have studied sex- specific patterns in herbivory and pollination, less attention has been paid to pathogens/parasites and a limited number of studies have revised sex-specific patterns in mycorrhizal symbiosis. In this article, we explore sex-specific interactions in dioecious and gynodioecio…

X-ray Emission from Protostellar Jets

2008

The nearest X-ray emitting protostellar jet (HH 154) observed with Hubble

2008

Context. The jet coming from the YSO binary L1551 IRS5 is the closest astrophysical jet known. It is therefore a unique laboratory for studies of outflow mechanisms and of the shocks occurring when expanding material hits the ambient medium as well as of how the related processes influence the star- (and planet-) forming process. Aims. The optical data are related to other data covering the spectrum from the optical band to X-rays with goal of understanding the energetics of low-mass star jets, in general, and of this jet in particular. We study the time evolution of the jet, by measuring the proper motions of knots as they progress outwards from the originating source. Methods. The nebulos…

Long-term monitoring of soil bulk density and erosion rates in two Prunus Persica (L) plantations under flood irrigation and glyphosate herbicide tre…

2021

Abstract Early season fruit production for the northern European market is highly intensive in fertilization, machinery, irrigation and the use of herbicides. Those conditions increase the soil losses and soil compaction and threaten the Sustainable Goals for Development of the United Nations by 2030. Long-term soil erosion measurements are necessary to determine the sustainability of agriculture managements. Moreover, soil erosion on flood irrigation land is a topic that request more surveys and research as rainfed sloping terrains attracted all the attention of scientists and research investment. Improved Stock Unearthing Method (ISUM) was applied to two 15 years-old herbicide treated fie…

Application of solid-phase microextraction for determining phenylurea herbicides and their homologous anilines from vegetables.

2004

Abstract Residues of metobromuron, monolinuron and linuron herbicides and their aniline homologous were analyzed in carrots, onions and potatoes by solid-phase microextraction (SPME) performed with a polyacrylate fiber. A juice was obtained from food samples that were further diluted, and an aliquot was extracted after sodium chloride (14%) addition and pH control. At pH 4 only the phenylureas were extracted. A new extraction at pH 11 allowed the extraction of phenylureas plus homologous aniline metabolites. Determination was carried out by gas chromatography with nitrogen–phosporus detection (NPD) the identity of the determined compounds was studied by gas chromatography–mass spectrometry.…

Perspectives for Globalized Natural Medicines

2011

Natural medicines provide valuable resources to meet the requirements for global health care at affordable prices. Therefore, safety and efficacy need to be proven in a comparable manner to conventional drugs. Evidence-based natural and western medicine may merge to a “one-world medicine” for the sake of all patients in industrialized and developing countries. In the present review, we discuss strategies for (1) preservation of traditional knowledge on natural medicines, (2) sustainability of medicinal herbs and natural products, and (3) standardization and quality control. Novel technologies will impact research on natural medicines in the years to come, e.g. remote sensing to map medicina…

Specific interactions of monotetrahydrofuranic annonaceous acetogenins as inhibitors of mitochondrial complex I.

2000

Annonaceous acetogenins (ACG) are a wide group of cytotoxic compounds isolated from plants of the Annonaceae family. Some of them are promising candidates to be a future new generation of antitumor drugs due to the ability to inhibit the NADH:ubiquinone oxidoreductase of the respiratory chain (mitochondrial complex I), main gate of the energy production in the cell. ACG are currently being tested on standard antitumor trials although little is known about the structure activity relationship at the molecular level. On recent studies, the relevance of several parts of the molecule for the inhibitory potency has been evaluated. Due to the great diversity of skeletons included in this family of…