نتایج جستجو برای: pcb compounds

تعداد نتایج: 231091  

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2006
Takashi Yarita Yoshie Aoyagi Masahiko Numata Akiko Takatsu

Supercritical fluid extraction (SFE) has been evaluated as an extraction technique for the isotope-dilution quantification of polychlorinated biphenyls (PCBs) in a sediment sample. A high-resolution mass-spectrometric system equipped with a gas chromatograph was employed for the determination of seven target PCB congeners. The effect of the operation parameters on the SFE efficiency was investi...

Journal: :Environmental science & technology 2004
Pamela B McLeod Martine J van den Heuvel-Greve Richelle M Allen-King Samuel N Luoma Richard G Luthy

We investigated the bioavailability via diet of spiked benzo[a]pyrene (BaP) and 2,2',5,5'-tetrachlorobiphenyl (PCB-52) from different carbonaceous (non-carbonate, carbon containing) particle types to clams (Macoma balthica) collected from San Francisco Bay. Our results reveal significant differences in absorption efficiency between compounds and among carbonaceous particle types. Absorption eff...

اسماعیل‌نیا, طاهره, امینی, الهه, دلیلی, حسین, شریعت, مامک, قربان صباغ, وفا, نیری, فاطمه,

Background: Human breast milk contains high levels of fat and toxins. These substances which exist in our country based on many reports. This study aimed to evaluate the concentration of polychlorinated biphenyls (PCBs) in the mother’s milk during the first postnatal week. Methods: This study was accomplished on 50 mothers who gave birth to a healthy infant at Vali-e-Asr University Hospit...

Journal: :Environmental science & technology 2008
Andrew S Campbell Yan Yu Steve Granick Andrew A Gewirth

We compare the association of an ortho-substituted and a planar PCB (polychlorinated biphenyls PCB-52 and PCB-77, respectively) with single-component phospholipid bilayers terminated with phosphocholine headgroups. First, fluorescence correlation spectroscopy (FCS) studies of diffusion on supported fluid-phase DLPC show that the ortho-substituted PCB diffuses more slowly, indicating either comp...

Journal: :Environmental science & technology 2004
Sandra C Karcher Mitchell J Small Jeanne M VanBriesen

Polychlorinated biphenyls (PCBs) were produced in the mid 1900s for industrial use. The term PCBs refers to 209 theoretically possible chlorinated compounds of the biphenyl molecule (congeners). The number and location of the chlorines govern both the environmental fate and toxicity of each congener. Changes in the distribution of congeners in river sediments can result from congener transforma...

2017
Bart Hens Luc Hens

Polychlorinated biphenyl (PCB)-contaminated sites around the world affect human health for many years, showing long latency periods of health effects. The impact of the different PCB congeners on human health should not be underestimated, as they are ubiquitous, stable molecules and reactive in biological tissues, leading to neurological, endocrine, genetic, and systemic adverse effects in the ...

Journal: :Environmental Research 2021

The widespread occurrence of persistent organic pollutants (POPs) in the environment is a matter concern. In this study, selected organohalogenated contaminants, including dichlorodiphenyltrichloroethane and its metabolites (DDTs) polychlorinated biphenyls (PCBs), chlordanes (CHLs), hexachlorobenzene (HCB), polybrominated diphenyl ethers (PBDEs), hexabromocyclododecanes (HBCDs), tetrabromobisph...

Journal: :The Indian journal of medical research 2003
J Anbalagan P Kanagaraj N Srinivasan M M Aruldhas J Arunakaran

BACKGROUND & OBJECTIVES Polychlorinated biphenyls (PCB), the synthetic chlorinated organic compounds, are known to decrease thyroid function, sperm count and fertility, and increase the risk of testicular cancer may cause serious effect on male reproduction. The objective of the present study was to study the effect of PCB, Aroclor 1254 on rat epididymal structure and function. METHODS Adult ...

2015
Waldemar Hoffmann Sandra Feliciano Ivan Martin Michael de Wild David Wendt

Secondary bone fracture healing is a physiological process that leads to functional tissue regeneration via endochondral bone formation. In vivo studies have demonstrated that early mobilization and the application of mechanical loads enhances the process of fracture healing. However, the influence of specific mechanical stimuli and particular effects during specific phases of fracture healing ...

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