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NaLa_(1-x)Tb_x(MoO_4)_2的燃烧法制备及发光性能研究
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作者 谢倩 蒲锡鹏 +5 位作者 钱先华 张大凤 邓爱霞 王自红 孙腾 陈维龙 《青岛科技大学学报(自然科学版)》 CAS 北大核心 2012年第2期144-148,共5页
采用燃烧法合成了系列NaLa(1-x)Tbx(MoO4)2绿色荧光粉。分别采用XRD和荧光分光光度计表征了合成样品的结构和发光性能,系统研究了煅烧温度及Tb3+的掺杂量对所得荧光粉物相组成及发光性能的影响。结果表明:采用燃烧法制备的NaLa(1-x)-Tbx... 采用燃烧法合成了系列NaLa(1-x)Tbx(MoO4)2绿色荧光粉。分别采用XRD和荧光分光光度计表征了合成样品的结构和发光性能,系统研究了煅烧温度及Tb3+的掺杂量对所得荧光粉物相组成及发光性能的影响。结果表明:采用燃烧法制备的NaLa(1-x)-Tbx(MoO4)2绿色荧光粉结晶良好、晶相单一、在280nm波长激发下具有良好的发光性能。确定煅烧温度为1 000℃,Tb3+的掺杂量x=0.5时发光效果最强。作为对照,采用高温固相法合成了NaLa0.5Tb0.5(MoO4)2荧光粉,结果表明,采用燃烧法合成的NaLa0.5-Tb0.5(MO4)2荧光粉具有更高的发光强度,并且大大缩短了煅烧时间。 展开更多
关键词 燃烧法 NaLa(1-x)Tbx(MoO4)2 荧光粉 发光性能
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大鼠低温海水淹溺肺脏血栓素B_2及6-酮-前列腺素F_(1α)的变化 被引量:2
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作者 姜忠华 钟广文 +4 位作者 王额尔墩 范静 贾钢锐 鲁青 杨东慧 《中华劳动卫生职业病杂志》 CAS CSCD 北大核心 2002年第1期29-31,共3页
目的 观察大鼠低温海水淹溺肺脏血栓素B2 (TXB2 )、6 酮 前列腺素F1α(6 Keto PGF1α)及T/P的变化规律 ,评价其对血气的影响。方法 将大鼠置于低温海水中游动 ,直至沉入水底濒临死亡 ,迅速取出测各组大鼠肛温 ,取心血行血气分析 ,... 目的 观察大鼠低温海水淹溺肺脏血栓素B2 (TXB2 )、6 酮 前列腺素F1α(6 Keto PGF1α)及T/P的变化规律 ,评价其对血气的影响。方法 将大鼠置于低温海水中游动 ,直至沉入水底濒临死亡 ,迅速取出测各组大鼠肛温 ,取心血行血气分析 ,并取各组及死亡组右肺组织 ,检测TXB2 及6 Keto PGF1α的含量 ,观察T/P变化 ;左肺组织计算干湿重比值 (D/W )。结果  5min组大鼠肛温[(2 0 .13± 0 .48)℃ ]、pH(6 .6 8± 0 .0 3)、动脉血氧分压 (PaO2 ) [(4 5 .0 0± 6 .30 )mmHg]、TXB2 [(97.46± 17.46 )ng/L]及 6 Keto PGF1α[(2 5 .5 9± 8.12 )ng/L]均降至最低点 ,与对照组比较 ,差异有显著性(P <0 .0 1) ,二氧化碳分压 (PaCO2 ) [(89.18± 5 .10 )mmHg]升至最高点 ,与对照组比较 ,差异有显著性 (P <0 .0 1) ,上述指标随后均呈恢复趋势 ,但仅有 2 40min组、36 0min组 pH(7.31± 0 .0 5、7.32±0 .0 7)及 36 0min组、死亡组TXB2 [(2 43.70± 32 .42 )、(2 5 7.0 2± 39.90 )ng/L]接近正常对照组水平 ,且差异无显著性 (P >0 .0 5 ) ;T/P则呈上升趋势 ,36 0min组T/P(10 .92± 3.84)升至最高点 ,与对照组比较 ,差异有显著性 (P <0 .0 1)。结论 大鼠低温海水淹溺肺组织TXB2 及 6 Keto PGF1α的含量受低温、低氧血? 展开更多
关键词 低温海水淹溺 血栓素B2 6-酮-前列腺素F1Α 大鼠 低氧血症 肺脏组织
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A DiGeorge Syndrome Case Report—Challenges of Diagnosis and Management
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作者 Dumitru Amoasii 《Open Journal of Internal Medicine》 2024年第3期278-286,共9页
Background: DiGeorge syndrome (also known as velo-cardio-facial syndrome) is a rare multisystem genetic disorder occurring in approximately 1 in 4000 to 1 in 6000 live births [1]. Although advances in genetic screenin... Background: DiGeorge syndrome (also known as velo-cardio-facial syndrome) is a rare multisystem genetic disorder occurring in approximately 1 in 4000 to 1 in 6000 live births [1]. Although advances in genetic screening have improved diagnosis in developed countries, the condition remains underdiagnosed in developing nations such as the Republic of Moldova, where access to genetic testing and family planning services is limited. Routine prenatal screening usually includes regular ultrasounds, monitoring of blood pressure, complete blood counts, coagulation studies, glucose, urine protein, and urine culture. Current ultrasound techniques have limitations in detecting this syndrome due to variability in interpretation, and genetic testing is often performed based on clinical discretion. The ultrasound could potentially point towards a genetic problem, as in DiGeorge, if multiple cardiac malformations are spotted in utero, but most cases such as this one are diagnosed after birth while being described as totally normal on prenatal ultrasound. Purpose: This study aims to highlight the diagnostic challenges and the need for comprehensive evaluation in identifying DiGeorge syndrome, emphasizing the importance of considering the syndrome as a whole rather than focusing on isolated organ system issues. Method: We present a case report of a 6-month-old girl who, after an uneventful pregnancy and normal prenatal ultrasound, presented with cardiac insufficiency. Following extensive investigations and multiple surgical interventions, DiGeorge syndrome was diagnosed at 9 months of age. Results: The patient’s diagnosis was delayed due to the lack of prenatal markers and the reliance on separate investigations of affected organ systems. Despite several interventions aimed at managing her symptoms, the final diagnosis was made after observing the association of multiple clinical features and conducting comprehensive genetic testing. Conclusions: This case underscores the importance of a holistic approach to diagnosis, which involves a thorough patient history, integration of diverse diagnostic tests, and recognition of the syndrome’s multi-system nature. It highlights the necessity for improved diagnostic protocols and increased awareness in regions with limited access to advanced genetic testing to prevent delays in identifying DiGeorge syndrome and to facilitate timely and appropriate management. 展开更多
关键词 DiGeorge Velo-Cardio-Facial tbx-1 Gene Chromosome 22 22q11.2 Deletion Septal Defect Immunodeficiency Thymic Shadow Congenital Cardiac Abnormalities Prenatal Screening
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