نتایج جستجو برای: tefs
تعداد نتایج: 85 فیلتر نتایج به سال:
Worldwide, populations of sturgeons are endangered, and it is hypothesized that anthropogenic chemicals, including dioxin-like compounds (DLCs), might be contributing to the observed declines in populations. DLCs elicit their toxic action through activation of the aryl hydrocarbon receptor (AhR), which is believed to regulate most, if not all, adverse effects associated with exposure to these c...
In June 2005, a World Health Organization (WHO)-International Programme on Chemical Safety expert meeting was held in Geneva during which the toxic equivalency factors (TEFs) for dioxin-like compounds, including some polychlorinated biphenyls (PCBs), were reevaluated. For this reevaluation process, the refined TEF database recently published by Haws et al. (2006, Toxicol. Sci. 89, 4-30) was use...
Recurrent tracheoesophageal fistula (TEF) is difficult to diagnose and even more difficult to repair. The key to the diagnosis is an adequate contrast study and bronchoscopy. The key to the repair is complete separation of the esophagus from the trachea, with the placement of viable tissue between the two suture lines. I have presented a personal experience with 38 consecutive repairs of recurr...
Paralytic shellfish poisoning results from consumption of seafood naturally contaminated by saxitoxin and its congeners, the paralytic shellfish toxins (PSTs). The levels of such toxins are regulated internationally, and maximum permitted concentrations in seafood have been established in many countries. A mouse bioassay is an approved method for estimating the levels of PSTs in seafood, but th...
Hydrophobically modified Y-zeolites were prepared by simple modification with triethoxyfluorosilane (TEFS). These zeolites, used as supports, enhanced the efficiency of deposited TiO(2) for the photocatalytic degradation of organics diluted in water.
Fish from Dutch markets were analysed for concentrations of polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (DL-PCBs) and compared with the new European maximum residue levels (MRLs), set in 2006. In a first study on 11 different fish and shellfish from various locations, concentrations of PCDD/Fs were nearly all below the MRL for PCDD/Fs [4 p...
RNA polymerase II (Pol2) movement through chromatin and the co-transcriptional processing and fate of nascent transcripts is coordinated by transcription elongation factors (TEFs) such as polymerase-associated factor 1 (Paf1), but it is not known whether TEFs have gene-specific functions. Using strand-specific nucleotide resolution techniques, we show that levels of Paf1 on Pol2 vary between ge...
A majority of the cases of acquired tracheo-esophageal fistula (TEF) are a result of complication of malignancy. Acquired non-malignant TEFs result from a variety of causes. Among these causes, the most common is iatrogenic that results from prolonged tracheal intubation. Denture impaction of the esophagus resulting in the development of an acquired TEF is rare. Whatever be the cause, the diagn...
Background: Acquired intrathoracic nonmalignant tracheoesophageal fistulas (TEFs) are rare and challenging surgical problems. They can constitute a life-threatening condition due to severe pulmonary complications poor nutrition. Surgical treatment is effective for most patients undergoing operative repair. However, in recent studies, the difficult-to-ignore early of be as high 62.5%. Among them...
The behavioral theory of the firm (BTOF) suggests that firms are motivated to increase R&D search in response profitability shortfalls—that is, R&D-based problemistic search. Although prior studies have provided considerable evidence for this influential explanation search, recent research shows it is not case transition economies. Our study sheds light on critical question Why economy (TEFs), ...
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