Results 71 to 80 of about 48,147 (228)

Do aphid endosymbiotic bacteria influence parasitoid searching behaviour through changes in aphid honeydew production?

Ecological Entomology, EarlyView.
Hamiltonella defensa infection increases honeydew production in certain aphid genotypes, potentially modifying aphid feeding behaviour. Parasitoid wasps, Aphidius ervi, are more attracted to honeydew from H. defensa‐infected aphids; though larger honeydew amounts may slightly deter searching.
Desiré Macheda, Alexandre Foito, Katharine F. Preedy, Colin J. Alexander, Ankush Prashar, Alison J. Karley   +5 more
wiley   +1 more source

Vacuum-assisted headspace-solid phase microextraction of pesticides in grape samples

Advances in Sample Preparation
Vacuum-assisted headspace solid-phase microextraction (Vac-HS-SPME) could provide an alternative for extracting pesticides from grape samples. Vac-HS-SPME method is utilized to the simultaneous analysis of six pesticides from various classes, namely ...
Yerkanat Syrgabek, Mereke Alimzhanova, Saltanat Yegemova, Svetlana Batyrbekova   +3 more
doaj   +1 more source

Stir Bar Sorptive Extraction - New Approach for the Determination of Some Beer Flavours.

Kvasný průmysl, 2008
For the determination of beer flavours well-established methods require sample preparation steps such as liquid/liquid extraction, solid phase extraction or distillation techniques. During the past years the microextraction procedures become popular e. g.
Tomáš HORÁK, Jiří ČULÍK, Marie JURKOVÁ, Pavel ČEJKA, Vladimír KELLNER   +4 more
doaj   +1 more source

Air Pollution in the Valparaiso Area [PDF]

, 2020
Volatile Organic Compounds (VOC’s) and particulate matter (PM) have been serious air pollution concerns around the world, particularly where industries and high volume traffic is present. These pollutants have been shown to have a negative effect on most
Burns, Meghanne, Junglas, Seth, King, Jack, Kohlmeyer, Kyle, McIntosh, Jessica, Peller, Julie, Tope, Jayden, Tran, Linh   +7 more
core   +1 more source

Determination of total and available fractions of PAHs by SPME in oily wastewaters : overcoming interference from NAPL and NOM [PDF]

, 2009
Background, aim, and scope Polycyclic aromatic hydrocarbons (PAHs) are often found in oily wastewaters. Their presence is usually the result of human activities and has a negative effect on the environment.
AJ King, AJ King, António G. Brito, CL Arthur, CL Arthur, CR Maxin, DW Potter, EU Ramos, F Busetti, G Ouyang, G Ouyang, H Wong, J Ai, J Poerschmann, J Poerschmann, J Rumble, JD Hamme Van, JD Kubicki, José M. Oliveira, João Peixoto, KD Jones, M Al Zarooni, M Brigante, MA Schlautman, P Mayer, P-H Lee, R Doong, R Doong, Regina Nogueira, RJ Bartelt, Rui B. Gomes, S Lesage, S Shokrollahzadeh, SK Samanta, T Gorecki, T Kose, T Luan, W Zhu, WHJ Vaes, Z Zhang, Z Zhang, Z Zhang   +41 more
core   +1 more source

An Easy Method to Sample Headspace Pheromones in the Field

Ethology, EarlyView.
Females of the orb‐web spider Argiope bruennichi produces a pheromone to attract males for mating. Most of our knowledge about the pheromone and its strategical use by the females is known from the laboratory. While we have confidence in the validity of these results, we wanted to make sure and measure pheromones in the field.
Zoe Dössel, Katharina Weiss, Jutta M. Schneider   +2 more
wiley   +1 more source

Trends in extraction and purification methods of Lignans in plant-derived foods

Food Chemistry: X
Lignans are widely used as dietary supplements within health foods. However, excess addition of lignans can induce adverse reactions, therefore, it is necessary to develop rapid, effective, economical, and environmentally friendly extraction and ...
Yu-tong Yang, Yuan Zhang, Yu Bian, Juan Zhu, Xue-song Feng   +4 more
doaj   +1 more source

Natural‐based antioxidants in cosmeceuticals: Extraction, bioavailability and skin ageing applications

International Journal of Cosmetic Science, EarlyView.
Natural antioxidants from plants, fruits, seeds and fungi combat ageing by neutralizing free radicals, boosting collagen and protecting against UV damage. Enhanced by green extraction and smart delivery systems, they offer powerful anti‐inflammatory and antimicrobial benefits.
Hossein Omidian, Arnavaz Akhzarmehr, Charise Dallazem Bertol   +2 more
wiley   +1 more source

Determination of Ochratoxin A in Wheat and Maize by Solid Bar Microextraction with Liquid Chromatography and Fluorescence Detection

Toxins, 2015
Solid bar microextraction (SBME), followed by liquid chromatography with fluorescence detection (HPLC-FLD), for the quantification of ochratoxin A in wheat and maize was developed.
Nabil Al-Hadithi, Philip Kössler, Petr Karlovsky   +2 more
doaj   +1 more source

Nitrogen isotope analysis of ammonium and glycine [PDF]

, 2005
Stable isotope techniques can be used as a tool in nitrogen cycling studies of different ecosystems. The studies are based on measurement of the heavy (15N)- to- light (14N) isotopic ratios of nitrogen in different biospheric pools.
Norlin, Elin
core