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The impact of transpacific transport of mineral dust in the United States
Duncan Fairlie, T.,Jacob, D.J.,Park, R.J. Pergamon Press ; Elsevier [distribution] 2007 Atmospheric environment Vol.41 No.6
We use a global chemical transport model (GEOS-Chem) to estimate the impact of transpacific transport of mineral dust on aerosol concentrations in North America during 2001. We have implemented two dust mobilization schemes in the model (GOCART and DEAD) and find that the best simulation of North American surface observations with GEOS-Chem is achieved by combining the topographic source used in GOCART with the entrainment scheme used in DEAD. This combination restricts dust emissions to year-round arid areas but includes a significant wind threshold for dust mobilization. The model captures the magnitude and seasonal cycle of observed surface dust concentrations over the northern Pacific. It simulates the free tropospheric outflow of dust from Asia observed in the TRACE-P and ACE-Asia aircraft campaigns of spring 2001. It reproduces the timing and distribution of Asian dust outbreaks in North America during April-May. Beyond these outbreaks we find persistent Asian fine dust (averaging 1.2μgm<SUP>-3</SUP>) in surface air over the western United States in spring, with much weaker influence (0.25μgm<SUP>-3</SUP>) in summer and fall. Asian influence over the eastern United States is 30-50% lower. We find that transpacific sources accounted for 41% of the worst dust days in the western United States in 2001.
Ayesha Shah,Veenaa Pakeerathan,Michael P Jones,Purna C Kashyap,Kate Virgo,Thomas Fairlie,Mark Morrison,Uday C Ghoshal,Gerald J Holtmann 대한소화기 기능성질환∙운동학회 2023 Journal of Neurogastroenterology and Motility (JNM Vol.29 No.2
Background/AimsSystemic sclerosis (SSc) often is complicated by small intestinal bacterial overgrowth (SIBO). A systematic review and meta-analysis thus examined the prevalence of SIBO in SSc (SSc-subtypes), identify risk factors for SIBO in SSc and the effects of concomitant SIBO on gastrointestinal symptoms in SSc. MethodsWe searched electronic databases until January-2022 for studies providing prevalence rates of SIBO in SSc. The prevalence rates, odds ratio (OR) and 95% confidence intervals (CI) of SIBO in SSc and controls were calculated. ResultsThe final dataset comprised 28 studies with 1112 SSc-patients and 335 controls. SIBO prevalence in SSc-patients was 39.9% (95% CI, 33.1-47.1; P = 0.006), with considerable heterogeneity, (I2 = 76.00%, P < 0.001). As compared to controls, there was a 10-fold increased SIBO prevalence in SSc-patients (OR, 9.6; 95% CI, 5.6-16.5; P < 0.001). The prevalence of SIBO was not different in limited cutaneous SSc as compared to diffuse cutaneous SSc (OR, 1.01; 95% CI, 0.46-2.20; P = 0.978). Diarrhea (OR, 5.9; 95% CI, 2.9-16.0; P = 0.001) and the association between SIBO in SSc and proton pump inhibitor use (OR, 2.3; 95% CI, 0.8-6.4; P = 0.105) failed statistical significance. Rifaximin was significantly more effective as compared to rotating antibiotic in eradicating SIBO in SSc-patients (77.8% [95% CI, 64.4-87.9]) vs 44.8% [95% CI, 31.7-58.4]; P < 0.05). ConclusionsThere is a 10-fold increased prevalence of SIBO in SSc, with similar SIBO prevalence rates in SSc-subtypes. Antimicrobial therapy of SIBO-positive SSc-patients with diarrhea should be considered. However, the results must be interpreted with caution due to substantial unexplained heterogeneity in the prevalence studies, and the low sensitivity and specificity of the diagnostic tests suggesting that the reliability of the evidence may be low.