Search Results

You are looking at 71 - 80 of 3,998 items for :

  • "monitoring" x
  • All content x
Clear All

vegetation — derived variables in monitoring forest dynamics and assembly rules. Community Ecol. 5: 105–114. Bartha S. Coenostate descriptors and spatial dependence in vegetation

Restricted access

Abstract  

Basic aspects of pollution and the role of analytical chemistry in environmental monitoring are highlighted and exemplified, with emphasis on trace elements. Sources and pathways of natural and especially man-made polluting substances as well as physico-chemical characteristics are given. Attention is paid to adequate sampling in various compartments of the environment comprising both lithosphere and biosphere. Trace analysis is dealt with using a variety of analytical techniques, including criteria for choice of suited techniques, as well as aspects of analytical quality assurance and control. Finally, some data on trace elements levels in soil and water samples from India are presented.

Restricted access

, 1133 – 1140 . Franco , V.G. , Perín , J.C. , Mantovania , V.E. & Goicoechea , H.C. ( 2006 ): Monitoring substrate and products in a

Open access

Abstract  

The use of environmental monitoring as a technique to identify activities related to the nuclear fuel cycle has been proposed by international organizations as an additional measure to the safeguards agreements currently in force. The specific element for each kind of nuclear activity, or nuclear signature, inserted into the ecosystem by several transfer paths, can be intercepted to a greater or lesser degree by different living organisms. This work demonstrates the technical viability of using pine needles as bioindicators for some nuclear signatures (Co, Ni, La, Ce, Sm, Th, and U) associated with uranium enrichment activities using high resolution inductively coupled plasma mass spectrometry (HR-ICP-MS). The concentrations of the elements whose signatures were sought and were determined in pine needle samples collected at five specific sampling locations inside the area investigated demonstrate the potential of the instrument and of the method used to identify and quantify the sought signatures present in low quantities (traces) in the evaluated matrix.

Restricted access

35 Moallem, U., Gur, P., Shpigel, N., Maltz, E., Livshin, N., Yacoby, S., Antman, A. and Aizinbud, E. (2002): Graphic monitoring of the course of some clinical conditions in dairy cows using

Restricted access

_Progressing_towards_TB_elimination.pdf . 4. European Centre for Disease Prevention and Control (ECDC)/ World Health Organization Regional Office for Europe . Tuberculosis surveillance and monitoring in Europe 2012 . Stockholm : ECDC ; Mar 2012 . Available from: http

Restricted access

Abstract  

Naphthenates are produced when naphthenic acids present in crude oil are mixed with brine. They deposit at oil/water interface and are insoluble in either of the phases causing a large problem to the oil industry. Generally, naphthenates precipitate jointly with others compounds such as sulfates and carbonates. This fact makes difficult their characterization. In this study, calcium stearate formation from stearic acid was investigated, under different conditions, as a previous model to understanding of calcium naphthenate precipitation. Medium reactions distinct were studied and the results indicated that the ethanol medium was the most efficient for the formation of solids because in this only case, the stearic acid was completely converted into stearate. Monitoring of the conversion was performed by thermogravimetry in spite of this technique not be typical in salts characterization. Nevertheless, the thermogravimetric analysis showed that is possible to identify differences between an organic acid, a salt of this acid and an inorganic salt, in the same sample. Infrared spectra was used in order to confirm the results obtained by thermogravimetry. However, this technique showed less efficiency and sensibility.

Restricted access
Acta Veterinaria Hungarica
Authors: Orsolya Erdősi, Katalin Szakmár, Zsuzsanna Szili, Géza Szita, Sándor Bernáth, József Sövényi, and Péter Laczay

. ( 2015 ): Monitoring Campylobacter in the poultry production chain –From culture to genes and beyond . J. Microbiol. Meth. 112 , 118 – 125 . Kawatsu , K. , Taguchi , M

Restricted access
Acta Phytopathologica et Entomologica Hungarica
Authors: M. Tóth, A. Nagy, I. Szarukán, K. Ary, A. Cserenyec, B. Fenyődi, D. Gombás, T. Lajkó, L. Merva, J. Szabó, P. Winkler, and J. K. Jósvai

. M. ( 2004 ): Use of ethyl and propyl ( E,Z )-2,4-decadienoate in codling moth management: Improving monitoring in Bartlett pear with high dose lures . J. Ent. Soc. British Columbia 101 , 45 – 52 . Knight , A. L. and Light , D. M. ( 2005

Open access

Ayzaki, S., Lipham, J. C., Portale, G. és mtsai: Bravo katheter-free pH monitoring: normal values, concordance, optimal diagnostic thersholds, and accuracy. Clin. Gastroenterol. Hepatol., 2009, 7 , 60

Restricted access