نتایج جستجو برای: 282 ppb
تعداد نتایج: 9870 فیلتر نتایج به سال:
In the present work, we built a mathematical model of polychlorinated biphenyl (PCB) bioaccumulation in Perna viridis, namely, a one-compartment model with a time dependent incorporation rate R (microg g(-1) lipid per ppb water per day), with positive substrate cooperativity as the underlying physical mechanism. The temporal change of the PCB concentration Q (microg g(-1) lipid) in the soft tis...
Limit=250 words To accurately estimate exposure of bees to pesticides, analytical methods are needed to enable quantification of ng/g (ppb) levels of contaminants in small samples of pollen or the individual insects. A modified QuEChERS extraction method coupled with ultra-high-performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) analysis was tested to quantify residues of 1...
The effect of chronic exposure (35 days) to sub-lethal concentrations of copper (17-212 ppb) and zinc (41-525 ppb) on growth of Farfantepenaeus paulensis postlarvae 17 days old (PL(17)) was analysed. The effects of acute exposure of PL(17) to the same metal on food ingestion and oxygen consumption were also evaluated. Studies were performed using copper and zinc singly, and in a mixture of equi...
Exhaled nitric oxide (eNO) is decreased in cystic fibrosis (CF). The effect of oral L-arginine, the precursor of enzymatic nitric oxide (NO) formation, on airway NO in patients with CF was studied. In a pilot study, oral L-arginine was given in a single dose of 200 mg x kg(-1) body weight to eight healthy controls and eight CF patients. Subsequently, the same L-arginine dose was given to 10 pat...
PURPOSE To provide updated American Brachytherapy Society (ABS) guidelines for transrectal ultrasound-guided transperineal interstitial permanent prostate brachytherapy (PPB). METHODS AND MATERIALS The ABS formed a committee of brachytherapists and researchers experienced in the clinical practice of PPB to formulate updated guidelines for this technique. Sources of input for these guidelines ...
با توجه به تأمین آب کارگاه تکثیر و پرورش ماهیان خاویاری دکتر شهید بهشتی از طریق رودخانه سفیدرود و امکان آلودگی آب مورد استفاده کارگاه به فلزات سنگین از طریق پسابها و زهابهای کشاورزی، اندازهگیری غلظت فلزات سنگین روی، مس، کادمیوم و سرب آب در مراحل مختلف تکثیر و پرورش انجام شد. بررسی غلظت فلزات سنگین (مس، روی، کادمیوم و سرب) درآب در مراحل مختلف تکثیر و پرورش ماهیان خاویاری در کارگاه شهید بهشتی...
استرسهای ناشی از آلایندهها، از جمله فلزات سنگین، به پاسخهای سلولی منجر میشوند که اغلب به صورت تغییرات فراساختاری نمایان میشوند. تغییرات فراساختاری سلولهای پوششی مثانة خرچنگ Astacus leptodactylusدر اثر تیمار با کلرید جیوه بررسی شد. 80 قطعه خرچنگ از تالاب انزلی صید و به تعداد مساوی به چهار تانک که هر کدام حاوی یکی از غلظتهای 0، 5، 15 و 20 ppb از کلرید جیوه بود، انتقال داده شدند. در پایان ...
Executive Summary Introduction Methods CommitteeComposition,Meetings, andDocument Preparation Document Structure Quality of Evidence and Strength of Recommendations Why Should a FENO Test be Obtained? Can FENO Be Used to Diagnose Asthma? FENO Is Associated with Eosinophilic Airway Inflammation FENO Predicts Likelihood of Corticosteroid Responsiveness FENO Can Support a Diagnosis of Asthma FENO ...
60 61 A thorough understanding of the surface O 3 response over a " receptor " region to 62 emission changes over a foreign " source " region is needed to evaluate the potential gains 63 from an international approach to abate ozone (O 3) pollution. We apply an ensemble of 64 21 global and hemispheric chemical transport models to estimate the average surface O 3 65 response over East Asia (EA),...
Pleuropulmonary blastoma (PPB) is a rare pediatric malignancy whose pathogens are poorly understood. Recent reports suggest that germline mutations in the microRNA-processing enzyme DICER1 may contribute to PPB development. To investigate the genetic basis of this cancer, we performed whole-exome sequencing or targeted deep sequencing of multiple cases of PPB. We found biallelic DICER1 mutation...
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