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流体混合及硫化作用形成的内华达杰里谷地区沉积岩中浸染型金矿矿石沉淀过程的化学反应途径模拟

国外火山地质 1992年第2期 67-74页

作者： a.h.hofstra 董永观

对内华达杰里谷地区金矿床的地质、地球化学、流体包裹体和稳定同位素的综合研究表明:该类矿床的金是通过流体混合及主岩中铁的硫化作用而沉淀的.这些矿床矿石沉淀过程中的化学反应途径模式表明,借助于流体混合,(包括矿液的同时冷却、... 详细信息

对内华达杰里谷地区金矿床的地质、地球化学、流体包裹体和稳定同位素的综合研究表明:该类矿床的金是通过流体混合及主岩中铁的硫化作用而沉淀的.这些矿床矿石沉淀过程中的化学反应途径模式表明,借助于流体混合,(包括矿液的同时冷却、稀释、氧化和与围岩反应)以及主岩中活性铁的硫化作用,可以解释在杰里谷地区及其他许多沉积岩中浸染型金矿床内所见到的自然金的浸染状产出状态,微细的颗粒、蚀变分带、矿物学和地球化学等现象.

关键词：金矿床同位素化学反应贵金属矿床流体包裹体矿物包体白云石化碳酸盐化作用矿石岩石方解石脉矿物分带沉淀过程杰里流体混合内华达美国

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美国内华达州Jerritt Canyon地区卡林型金矿床的地质结构和成因

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国外铀金地质 1993年第3期10卷 215-223页

作者： a.h.hofstra W.E.Daly D.J.Birak 周德安核工业北京地质研究院 100029

Jerritt Canyon金矿区含有可果金储量约105t。从1981年开始开采,生产了约78t的金。矿石品位平均为4.11×10^(-6)。矿床局限于冒地槽成因的碳质灰岩,碳质钙质粉砂岩和燧石中,属晚泥盆世到中志留世的hanson Creek和早志留世到早泥盆世的Re... 详细信息

Jerritt Canyon金矿区含有可果金储量约105t。从1981年开始开采,生产了约78t的金。矿石品位平均为4.11×10^(-6)。矿床局限于冒地槽成因的碳质灰岩,碳质钙质粉砂岩和燧石中,属晚泥盆世到中志留世的hanson Creek和早志留世到早泥盆世的Reberts山脉建造。这些岩石经晚寒武世和泥盆纪Snow

关键词：金矿床卡林型地质结构成因

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Extreme variation of sulfur isotopic compositions in pyrite from the Qiuling sediment-hosted gold deposit,West Qinling orogen,central China:an in situ SIMS study with implications for the source of sulfur

Extreme variation of sulfur isotopic compositions in pyrite ...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Lei Chen Xian-hua Li Jian-wei Li Albert h.hofstra Yu Liu Alan E.Koenig State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences U.S.Geological Survey

high spatial resolution textural(scanning electron microscope(SEM)),chemical(electron microprobe(EMP))and laser ablation-inductively coupled plasma-mass spectrometry(LA-ICP-MS)),and sulfur isotopic(secondary ion mass spectrometry(SIMS))analyses of pyrite from the Qiuling sediment-hosted gold deposit(232±4 Ma)in the West Qinling orogen,central China were conducted to distinguish pyrite types and gain insights into the source and evolution of sulfur in hydrothermal *** results reveal an enormous variation(-27.1 to+69.6‰)in sulfur isotopic composition of pyrite deposited during three paragenetic ***-ore framboidal pyrite,which is characterized by low concentrations of As,Au,Cu,Co,and Ni,has negativeδS values of-27.1 to-7.6‰that are interpreted in terms of bacterial reduction of marine sulfate during sedimentation and diagenesis of the Paleozoic carbonate and clastic sequences,the predominant lithologies in the deposit area,and the most important hosts of many sediment-hosted gold deposits throughout the West Qinling *** ore-stage hydrothermal pyrite contains high concentrations of Au,As,Cu,Sb,Tl,and Bi and hasa relatively narrow range of positiveδS values ranging from+8.1 to+15.2‰.The sulfur isotope data are comparable to those of ore pyrite from many Triassic orogenic gold deposits and Paleozoic sedimentary exhalative(SEDEX)Pb-Zn deposits in the West Qinling orogen,both being hosted mainly in the Devonian *** similarity indicates that sulfur,responsible for the auriferous pyrite at Qiuling,was largely derived from the metamorphic devolatization of Paleozoic marine sedimentary ***-ore-stage pyrite,which is significantly enriched in Co and Ni but depleted in Au and As,has unusually highδS values ranging from+37.4 to+69.6‰,that are interpreted to result from thermochemical reduction of evaporite sulfates in underlying Cambrian sedimentary rocks with very highδS *** variations in Au content and sulfur isotopic compositions acro

关键词： Pyrite SIMS Sulfur isotopes Sediment-hosted gold deposit Qinling orogen

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Impact of metabolic dysfunction-associated steatotic liver disease on COVID-19 hospitalizations:A propensity-matched analysis of the United States

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World Journal of Virology 2024年第1期13卷 51-60页

作者： Abdullah Sohail hassam Ali Pratik Patel Subanandhini Subramanium Dushyant Singh Dahiya Amir h Sohail Manesh Kumar Gangwani Sanjaya K Satapathy Department of Internal Medicine University of Iowa Roy J and Lucille A Carver College of MedicineIowaIA 52242United States Division of Gastroenterology and hepatology East Carolina University/Brody School of MedicineGreenvilleNC 27858United States Department of Gastroenterology Mather Hospital/Hofstra University Zucker School of MedicineNY11777United States Department of Internal Medicine East Carolina University Brody School of MedicineGreenvilleNC 27834United States Division of Gastroenterology Hepatology&MotilityThe University of Kansas School of MedicineKansas CityKS 66160United States Department of Surgery University of New MexicoAlbuquerqueNM 87106United States Department of Internal Medicine The University of ToledoToledoOH 43606United States Section on Gastroenterology and hepatology North Shore University Hospital and Long Island Jewish Medical CenterManhassetNY 11030United States

BACKGROUND Metabolic dysfunction-associated steatotic liver disease(MASLD),formally known as nonalcoholic fatty liver disease,is the most common chronic liver disease in the United *** with MASLD have been reported to be at a higher risk of developing severe coronavirus disease 2019(COVID-19)and ***,most studies are single-center studies,and nationwide data in the AIM To study the influence of MASLD on COVID-19 hospitalizations during the initial phase of the *** We retrospectively analyzed the 2020 National Inpatient Sample(NIS)database to identify primary COVID-19 hospitalizations based on an underlying diagnosis of MASLD.A matched comparison cohort of COVID-19 hospit-alizations without MASLD was identified from NIS after 1:N propensity score matching based on gender,race,and comorbidities,including hypertension,heart failure,diabetes,and *** primary outcomes included inpatient mortality,length of stay,and hospitalization *** outcomes included the prevalence of systemic *** A total of 2210 hospitalizations with MASLD were matched to 2210 hospitalizations without MASLD,with a good comorbidity ***,there was a higher prevalence of severe disease with more intensive care unit admissions(9.5%vs 7.2%,P=0.007),mechanical ventilation(7.2%vs 5.7%,P=0.03),and septic shock(5.2%vs 2.7%,Phe MASLD cohort than in the non-MASLD ***,there was no difference in mortality(8.6%vs 10%,P=0.49),length of stay(5 d vs 5 d,P=0.25),and hospitalization costs(42081.5$vs 38614$,P=0.15)between the MASLD and non-MASLD *** The presence of MAFLD with or without liver cirrhosis was not associated with increased mortality in COVID-19 hospitalizations;however,there was an increased incidence of severe COVID-19 *** data(2020)predates the availability of COVID-19 vaccines,and many MASLD patients have since been *** will be interesting to see if these trends are

关键词： COVID-19 Metabolic dysfunction-associated steatotic liver disease Prevalence hospital charges Inpatient resource utilization

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Association between acute peripancreatic fluid collections and early readmission in acute pancreatitis:A propensity-matched analysis

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World Journal of Experimental Medicine 2024年第2期14卷 75-88页

作者： hassam Ali Faisal Inayat Waqas Rasheed Arslan Afzal Ahtshamullah Chaudhry Pratik Patel Attiq Ur Rehman Muhammad Sajeel Anwar Gul Nawaz Muhammad Sohaib Afzal Amir h Sohail Subanandhini Subramanium Dushyant Singh Dahiya Deepa Budh Babu P Mohan Douglas G Adler Department of Gastroenterology and hepatology East Carolina University Brody School of MedicineGreenvilleNC 27834United States Department of Internal Medicine Allama Iqbal Medical CollegeLahorePunjab 54550Pakistan Department of Internal Medicine Texas Tech University Health Sciences CenterLubbockTX 79430United States Department of Internal Medicine St.Dominic’s HospitalJacksonMS 39216United States Department of Gastroenterology Mather Hospital and Hofstra University Zucker School of MedicinePort JeffersonNY 11777United States Department of hepatology Geisinger Wyoming Valley Medical CenterWilkes-BarrePA 18711United States Department of Internal Medicine UHS Wilson Medical CenterJohnson CityNY 13790United States Department of Internal Medicine Louisiana State University HealthShreveportLA 71103United States Department of Surgery University of New Mexico School of MedicineAlbuquerqueNM 87106United States Division of Gastroenterology Hepatologyand MotilityThe University of Kansas School of MedicineKansas CityKS 64108United States Department of Internal Medicine St.Barnabas Hospital and Albert Einstein College of MedicineBronxNY 10457United States Department of Gastroenterology and hepatology University of Utah School of MedicineSalt Lake CityUT 84132United States Center for Advanced Therapeutic Endoscopy Porter Adventist HospitalCentura HealthDenverCO 80210United States

BACKGROUND Patients with acute pancreatitis(AP)frequently experience hospital readmissions,posing a significant burden to healthcare *** peripancreatic fluid collection(APFC)may negatively impact the clinical course of *** could worsen symptoms and potentially lead to additional ***,clinical evidence regarding the specific association between APFC and early readmission in AP remains *** the link between APFC and readmission may help improve clinical care for AP patients and reduce healthcare *** To evaluate the association between APFC and 30-day readmission in patients with *** This retrospective cohort study is based on the Nationwide Readmission Database for *** with a primary diagnosis of AP were *** were categorized into those with and without APFC.A 1:1 propensity score matching for age,gender,and Elixhauser comorbidities was *** primary outcome was early readmission *** outcomes included the incidence of inpatient complications and healthcare *** analyses used Mann-Whitney U andχ2 tests,while Cox regression models assessed 30-day readmission risks and reported them as adjusted hazard ratios(ahR).Kaplan-Meier curves and log-rank tests verified readmission *** A total of 673059 patients with the principal diagnosis of AP were *** these,5.1%had APFC on initial *** propensity score matching,each cohort consisted of 33914 *** with APFC showed a higher incidence of inpatient complications,including septic shock(3.1%vs 1.3%,Phrombosis(4.4%vs 0.8%,Phanical ventilation(1.8%vs 0.9%,Phe length of stay(LOS)was longer for APFC patients[4(3-7)vs 3(2-5)days,Phospital charges($29451 vs$24418,Phad a higher rate(15.7%vs 6.5%,Phe APF

关键词： Acute pancreatitis Acute peripancreatic fluid collections Readmission predictors Inpatient complications healthcare utilization and costs

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Early versus delayed necrosectomy in pancreatic necrosis:A population-based cohort study on readmission,healthcare utilization,and in-hospital mortality

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World Journal of Methodology 2024年第3期14卷 55-67页

作者： hassam Ali Faisal Inayat Vinay Jahagirdar Fouad Jaber Arslan Afzal Pratik Patel hamza Tahir Muhammad Sajeel Anwar Attiq Ur Rehman Muhammad Sarfraz Ahtshamullah Chaudhry Gul Nawaz Dushyant Singh Dahiya Amir h Sohail Muhammad Aziz Division of Gastroenterology and hepatology East Carolina University Brody School of MedicineGreenvilleNC 27834United States Department of Internal Medicine Allama Iqbal Medical CollegeLahorePunjab 54550Pakistan Department of Internal Medicine University of Missouri-Kansas CityKansas CityMO 64108United States Division of Gastroenterology Mather Hospital and Zucker School of Medicine at Hofstra UniversityPort JeffersonNY 11777United States Department of Internal Medicine Jefferson Einstein HospitalPhiladelphiaPA 19141United States Department of Internal Medicine UHS Wilson Medical CenterJohnson CityNY 13790United States Division of Gastroenterology and hepatology Geisinger Wyoming Valley Medical CenterWilkes-BarrePA 18711United States Department of Internal Medicine St.Dominic's HospitalJacksonMS 39216United States Division of Gastroenterology Hepatologyand MotilityThe University of Kansas School of MedicineKansas CityKS 66160United States Department of Surgery University of New Mexico School of MedicineAlbuquerqueNM 87106United States Division of Gastroenterology and hepatology The University of ToledoToledoOH 43606United States

BACKGROUND Acute necrotizing pancreatitis is a severe and life-threatening *** poses a considerable challenge for clinicians due to its complex nature and the high risk of *** minimally invasive and open necrosectomy procedures have been *** advancements in treatment modalities,the optimal timing to perform necrosectomy lacks *** To evaluate the impact of necrosectomy timing on patients with pancreatic necrosis in the United *** A national retrospective cohort study was conducted using the 2016-2019 Nationwide Readmissions *** with non-elective admissions for pancreatic necrosis were *** participants were divided into two groups based on the necrosectomy timing:The early group received intervention within 48 hours,whereas the delayed group underwent the procedure after 48 *** various intervention techniques included endoscopic,percutaneous,or surgical *** major outcomes of interest were 30-day readmission rates,healthcare utilization,and inpatient *** A total of 1309 patients with pancreatic necrosis were *** propensity score matching,349 cases treated with early necrosectomy were matched to 375 controls who received delayed *** early cohort had a 30-day readmission rate of 8.6% compared to 4.8%in the delayed cohort(P=0.040).Early necrosectomy had lower rates of mechanical ventilation(2.9%vs 10.9%,Phock(8%vs 19.5%,Phospital mortality(1.1%vs 4.3%,P=0.01).Patients in the early intervention group incurred lower healthcare costs,with median total charges of $52202 compared to$147418 in the delayed *** in the early cohort also had a relatively shorter median length of stay(6 vs 16 days,Phe timing of necrosectomy did not significantly influence the risk of 30-day readmission,with a hazard ratio of 0.56(95%confidence interval:0.31-1.02,P=0.06).CONCLUSION Our findings show that

关键词： Acute necrotizing pancreatitis Pancreatic necrosis Early necrosectomy Delayed necrosectomy Readmission,healthcare costs Mortality

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