Results 51 to 60 of about 6,448,115 (298)

Recovery of gangliosides from aqueous solutions on styrene-divinylbenzene copolymer columns1

Journal of Lipid Research, 2002
An investigation was made using a styrene-divinylbenzene copolymer as a solid phase sorbent to recover gangliosides from aqueous solutions. A comparison with octadecyl-bonded (C18) silica gel showed that the general procedure used to purify gangliosides ...
Iuliana Popa, Cristina Vlad, Jacques Bodennec, Jacques Portoukalian   +3 more
doaj   +1 more source

Determination of itraconazole and hydroxyitraconazole in plasma by use of liquid chromatography-tandem mass spectrometry with on-line solid-phase extraction [PDF]

, 2003
In this paper a method for the simultaneous quantification of the anti-fungal drug itraconazole and its co-active metabolite hydroxyitraconazole in plasma employing liquid chromatography tandem-mass spectrometry and automated solid-phase extraction is ...
Spöhrer, Ute, Schiel, Xaver, Vogeser, Michael   +2 more
core   +1 more source

Epigenetic reprogramming of lineage switching in cancer

FEBS Letters, EarlyView.
Cancer cells rarely commit to a single identity. Epigenetic mechanisms and tumor microenvironment cues push epithelial cells toward flexible, hybrid states that can shift into mesenchymal, neuroendocrine, or stem‐like fates, driving metastasis, drug resistance, and tumor heterogeneity. Targeting the epigenetic regulators behind these transitions, using
Ezgi Boyvatlı, Burcu Akman, Ezgi Bağırsakçı, Nese Atabey, Serap Erkek‐Ozhan   +4 more
wiley   +1 more source

Pré-concentração de cádmio com Saccharomyces cerevisiae e determinação em águas fluviais usando espectrometria de emissão óptica com plasma indutivamente acoplado Preconcentration of cadmium with Saccharomyces cerevisiae and determination in river water using inductively coupled plasma optical emission spectrometry

Química Nova, 2007
A preconcentration method based on the use of Saccharomyces cerevisiae as sorbent material is proposed for the determination of Cd(II) in river water.
Priscila Andreoli Biscaro, Amauri Antonio Menegário, Paulo Sergio Tonello, Rogério Caldorin   +3 more
doaj   +1 more source

OligoHydrogelArray (OHA) for Parallelized Solid‐Phase Extraction of Oligonucleotides

Advanced Materials Interfaces, 2023
Immobilization of oligonucleotides on solid surfaces is an important step in many experimental workflows in biology, such as gene expression analysis, genotyping, and drug discoveries.
Michelle J. Iwohn, Maximilian Seifermann, Patrick Reiser, Julius Höpfner, Razan El Khaled El Faraj, Stefan Heißler, Anna A. Popova, Pavel A. Levkin   +7 more
doaj   +1 more source

Ligand‐dependent transcriptional heterogeneity in cell cycle gene expression delays G1/S entry

FEBS Letters, EarlyView.
EGF and HRG induce distinct G1/S progression programs in ErbB2‐amplified BT474 breast cancer cells. Despite activating the potent ErbB2–ErbB3 heterodimer, HRG does not accelerate cell‐cycle entry. Instead, EGF promotes earlier restriction‐point passage via ERK–FOS signaling, whereas HRG activates the AKT–MYC axis, driving transcriptional heterogeneity ...
Ririn Rahmala Febri, Ayaka Nagasato‐Ichikawa, Keita Iida, Shuhei Kimura, Akira Imamoto, Mariko Okada   +5 more
wiley   +1 more source

Preconcentration, determination and speciation of iron by solid-phase extraction using dimethyl (E)-2-[(Z)-1-acetyl)-2-hydroxy-1-propenyl]-2-butenedioate

Química Nova, 2012
A new sensitive and selective procedure for speciation of trace dissolved Fe(III) and Fe(II), using modified octadecyl silica membrane disks and determination by flame atomic absorption spectrometry was developed.
Gholamreza Khayatian, Shahed Hassanpoor, Farough Nasiri, Amin Zolali   +3 more
doaj   +1 more source

From junk to function — How weak selection in eukaryotes builds new parts and drives genomic complexity

FEBS Letters, EarlyView.
How do genomes gain new functional parts? In eukaryotes, which tend to evolve under weak selection, much of the genome is junk. Palazzo and Qiu borrow the logic of Markov chains to show how non‐functional DNA becomes functional through the appearance of intermediate states, which arise due to epistasis, buffering, and biochemical messiness, allowing ...
Alexander F. Palazzo, Yi Qiu
wiley   +1 more source

Supercritical fluid extraction of veterinary drug residues from meat [PDF]

, 1999
End of project ReportExtraction is a key step in the analysis of food samples for residues of veterinary drugs. Over the last ten years there has been increasing interest in alternatives to the use of organic solvents for sample extraction.
O'Keeffe, Mandy J., O'Keeffe, Michael
core   +1 more source

Considerações sobre o preparo de amostras contendo micropoluentes estrogênicos

Química Nova, 2012
In this work, the materials used in the recovery of estrogens from aqueous matrices by filtration and solid phase extraction were evaluated. The results showed that glass-fiber filters allow a recovery and repeatability compatible with this type of ...
Marcus Vinicius de Liz, Noemi Nagata, Patricio Peralta-Zamora   +2 more
doaj   +1 more source