Search results for "Herb"

X-ray emission from fast moving shocks in the protostellar jet HH 154: a binding diagnostic of the emission mechanism

2004

We propose to determine the proper motion of the X-ray source associated with HH 154, the only known protostellar jet in which the X-ray emission mechanism can be studied in detail. Our numerical simulations indicate that the X-rays are produced in a fast-moving (500 km/s) post-shock region, and our HST observations show high proper motion shocked material moving at similar speed. Detection (or lack of) of proper motion of the X-ray source will strongly confirm (or falsify) our model, and constitute the basis for a general theory of X-ray emission in protostellar jets. Understanding and modeling the emission mechanism is key to assess the lifetime of the X-ray emission and thus the influenc…

Validation of a set of reference genes to study response to herbicide stress in grasses

2012

Abstract Background Non-target-site based resistance to herbicides is a major threat to the chemical control of agronomically noxious weeds. This adaptive trait is endowed by differences in the expression of a number of genes in plants that are resistant or sensitive to herbicides. Quantification of the expression of such genes requires normalising qPCR data using reference genes with stable expression in the system studied as internal standards. The aim of this study was to validate reference genes in Alopecurus myosuroides, a grass (Poaceae) weed of economic and agronomic importance with no genomic resources. Results The stability of 11 candidate reference genes was assessed in plants res…

Kritiikin lupaus : näkökulmia Frankfurtin koulun kriittiseen teoriaan

1998

Uhanalaisen ketokatkeron (Gentianella campestris) vasteet niittokorkeuden ja -ajan vaihteluun

2007

Wizerunek św. Floriana jako symbol heraldyczny w niektórych herbach polskich gmin i miast

2016

Wizerunek św. Floriana w porównaniu z wizerunkami innych świętych, obok św. Jerzego, jest jednym z najczęściej wykorzystywanych wizerunków w herbach polskich. Nasuwa się pytanie: Dlaczego tak się dzieje? Odpowiedź jest bardzo prosta. Otóż św. Florian to wzór człowieka nieugiętego w swoich przekonaniach, wzór wierności wyznawanej wiary, wzór męstwa, odwagi, ofiarności, który narażał się dla bliźnich, przyjaciół, chciał pomóc, chciał ulżyć w cierpieniu. Św. Florian, patron m.in. ludzi, którzy w trosce o życie, zdrowie i mienie bliźniego oraz środowisko walczą z pożarami i miejscowymi zagrożeniami, jest wciąż pamiętany i czczony w wielu zakątkach naszego kraju i poza nim, a pamięć ta jest okaz…

New national and regional biological records for Finland 11 : Contributions to Bryophyta and Marchantiophyta 10

2023

Ten species of mosses (Bryophyta: Entosthodon obtusus, Entosthodon ulvinenii, Eurhynchiastrum diversifolium, Hedwigia emodica, Hedwigia mollis, Hygrohypnum styriacum, Plagiothecium rossicum, Polytrichum perigoniale, Tortella alpicola and Ulota intermedia) are presented as new for Finland. Cephalozia lacinulata, previously considered to be regionally extinct from Finland, is reported to being found again. New records in biogeographical provinces for 67 species of mosses and 34 species of liverworts are listed. Finally, 6 occurrences in provinces are removed due to misidentifications or missing specimens. peerReviewed

Green approach to corrosion inhibition of stainless steel in phosphoric acid of Artemesia herba albamedium using plant extract

2019

Essential oil from aerial parts of Artemisia herba-alba from Morocco was hydrodistilled and its chemical composition oil was investigated by capillary GC and GC/MS. The major components were 1,8-cineole (35.6%) and camphor (24.1%). Artemisia herba-alba essential oil AHAO was tested as corrosion inhibitor of stainless steel (SS) in 1M H3PO4 using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy measurements (EIS) and scanning electronically microscopy (SEM) studies. The results obtained showed that the essential oil of Artemisia reduces the corrosion rate. Tafel polarization method indicates that the plant extract behaves as a mixed type inhibitor. The inhibition…

Biology of the sauropod dinosaurs: the evolution of gigantism

2010

The herbivorous sauropod dinosaurs of the Jurassic and Cretaceous periods were the largest terrestrial animals ever, surpassing the largest herbivorous mammals by an order of magnitude in body mass. Several evolutionary lineages among Sauropoda produced giants with body masses in excess of 50 metric tonnes by conservative estimates. With body mass increase driven by the selective advantages of large body size, animal lineages will increase in body size until they reach the limit determined by the interplay of bauplan, biology, and resource availability. There is no evidence, however, that resource availability and global physicochemical parameters were different enough in the Mesozoic to ha…

Diuron mobility through vineyard soils contaminated with copper

2005

International audience; The herbicide diuron is frequently applied to vineyard soils in Burgundy, along with repeated treatments with Bordeaux mixture (a blend of copper sulfate and calcium hydroxide) that result in elevated copper concentrations. Cu could in principle affect the fate and transport of diuron or its metabolites in the soil either directly by complexation or indirectly by altering the populations or activity of microbes involved in their degradation. To assess the effect of high Cu concentrations on diuron transport, an experiment was designed with ten undisturbed columns of calcareous and acidic soils contaminated with 17–509 mg kg−1 total Cu (field-applied). Grass was plant…

Plant-herbivorous beetle networks : molecular characterization of trophic ecology within a threatened steppic environment

2015

DNA barcoding facilitates many evolutionary and ecological studies, including the examination of the dietary diversity of herbivores. In this study, we present a survey of ecological associations between herbivorous beetles and host plants from seriously threatened European steppic grasslands. We determined host plants for the majority (65%) of steppic leaf beetles (55 species) and weevils (59) known from central Europe using two barcodes (trnL and rbcL) and two sequencing strategies (Sanger for mono/oligophagous species and Illumina for polyphagous taxa). To better understand the ecological associations between steppic beetles and their host plants, we tested the hypothesis that leaf beetl…