Effect of soil humic and fulvic acids, pH and ionic strength on Th(IV) sorption to TiO2 nanoparticles.

Thorium is considered as a chemical analog of other tetravalent actinides. Herein, the sorption of Th(IV) on TiO(2) in the presence or absence of soil fulvic acid (FA)/humic acid (HA) as a function of pH, ionic strength and FA/HA concentration has been studied by a batch method. The morphology was characterized by scanning electron microscopy (SEM). The results indicate that sorption of Th(IV) on TiO(2) increases from 0% to approximately 94% at pH 1 approximately 4, and then maintains level with increasing pH values. Both FA and HA have a positive effect on Th(IV) sorption at low pH values and the contribution of FA on Th(IV) sorption is rather higher than that of HA at pH<4. The sorption is weakly dependent on the concentration of KNO(3) in solution, but the cations K(+), Na(+) and Li(+) influence Th(IV) sorption more obviously. The batch results indicate that the inner sphere complex formation is formed at bare surfaces or FA/HA-bound TiO(2) particle surfaces. Results of SEM analysis show that the particle sizes of TiO(2), Th-TiO(2) and Th-HA-TiO(2) colloids are quite different. Surface complexation may be considered as the main sorption mechanism.     

动态增强MRI鉴别诊断前列腺中央腺体T2WI低信号病变

目的 观察动态增强MRI （DCE-MRI）定量及半定量参数鉴别诊断前列腺中央腺体T2WI低信号病变的价值。方法 收集59例存在前列腺中央腺体T2WI低信号病变患者,其中前列腺癌患者32例（前列腺癌组）,前列腺增生伴慢性炎症患者15例（增生伴慢性炎症组）,高级别上皮内瘤变（HGPIN）患者12例（HGPIN组）,测量并比较其DCE-MRI定量及半定量参数：容积转运常数（K^trans）、速率常数（K_ep）、血管外细胞外容积分数（V_e）、对比剂血浆容积（V_p）、达峰时间（TTP）、最大浓度（Conc_max）、最大斜率（Slope_max）和时间-浓度曲线下面积（AUTC）,绘制ROC曲线,分析各参数诊断前列腺癌的效能。结果 前列腺癌组、增生伴慢性炎症组与HGPIN组间K_trans、K_ep、V_e、V_p、TTP及Slope_max差异均有统计学意义（P均<0.05）,其中前列腺癌组与HGPIN组间K^trans、K_ep、V_e、Slope_max及TTP差异均有统计学意义（P均<0.05）,前列腺癌组与增生伴慢性炎症组间V_p及TTP差异有统计学意义（P均<0.05）,HGPIN组与增生伴慢性炎症组间K^trans、K_ep、V_p及TTP差异均有统计学意义（P均<0.05）。ROC曲线显示TTP、K^trans及K_ep值诊断前列腺癌的曲线下面积（AUC）分别为0.743、0.735和0.721,两两比较差异均无统计学意义（P均>0.05）,但均大于V_e值诊断前列腺癌的AUC （P均<0.05）。结论 DCE-MRI参数TTP、K^trans和K_ep可于前列腺中央腺体T2WI低信号病变中有效鉴别诊断前列腺癌。     

基于前列腺影像报告和数据系统第2版的机器学习模型诊断高级别前列腺癌

目的 建立基于前列腺影像报告和数据系统第2版（PI-RADS v2）的支持向量机（SVM）、决策树（DT）和Logistic回归3种机器学习模型,评价上述模型对高级别前列腺癌的诊断价值。方法 回顾性分析于我院接受前列腺多参数MR扫描并取得病理结果的194例患者的资料,其中高级别癌63例,非高级别癌131例。将评价因素（PI-RADS v2评分、年龄、游离前列腺特异抗原、前列腺特异性抗原比值、前列腺特异抗原密度）录入SVM、DT和Logistic回归3种机器学习模型进行诊断,通过ROC曲线评价PI-RADS v2评分和3种机器学习模型诊断高级别前列腺癌的价值。结果 PI-RADS v2、SVM、DT和Logistic回归模型诊断高级别前列腺癌的敏感度分别为72.73%、69.09%、87.27%和70.91%;特异度分别为87.29%、93.22%、93.22%和95.76%。DT模型诊断高级别前列腺癌ROC的AUC（AUC=0.90,P<0.01）最大,且与PI-RADS v2评分、SVM、Logistic回归比较差异均有统计学意义（P均<0.05）。结论 PI-RADS v2评分、SVM、DT和Logistic回归模型诊断高级别前列腺癌的价值均较好。     

Retraction: Enhanced adsorption of ionizable aromatic compounds on humic acid-coated carbonaceous adsorbents

Retraction of ‘Enhanced adsorption of ionizable aromatic compounds on humic acid-coated carbonaceous adsorbents’ by Yubing Sun et al., RSC Adv., 2012, 2, 10359–10364, DOI: 10.1039/C2RA21713A.

The Royal Society of Chemistry, with the agreement of the named authors, hereby wholly retracts this RSC Advances article due to concerns with the reliability of the data in the published article.Repeating fragments can be observed in the XRD spectrum for GONs in Fig. 1C, which indicates that it has been manipulated. In addition, there are unexpected similarities in the baseline of the XRD data presented for MWCNTs and AC (Fig. 1C) in the 32.5–40° and 45–57.5° regions.Given the significance of the concern about the validity of the data, the findings presented in this paper are no longer reliable.Signed: Yubing Sun, Dadong Shao, Guixia Zhao, Shubin Yang and Xiangke WangDate: 27^th March 2020Changlun Chen, Jiaxing Li and Xiaoli Tan were contacted but did not respond.Retraction endorsed by Laura Fisher, Executive Editor, RSC Advances     

Pneumatosis cystoides intestinalis: A case report

Rationale:Pneumatosis cystoides intestinalis (PCI) is a rare condition characterized by multiple gas-filled cysts in the intestinal wall, and can be caused by many conditions.Patient concerns:We reported a-69-year-old man with a long history of chronic obstructive pulmonary disease was admitted to the gastroenterology department because of alternating bowel movement and intermittent bloody stool.Diagnoses:Colonoscopy revealed multiple nodular protuberances covered with normal-looking mucosa in the ascending and proximal transverse colon. Abdominal computed tomography scan and endoscopic ultrasound revealed multiple gas-filled cystic lesions in the submucosa. The diagnosis of PCI was confirmed by cyst collapse after puncturing with a fine needle.Interventions and outcomes:Considering that the patient had no peritonitis or other complications, conservative approaches, including oxygen inhalation and oral probiotics, were used. The patient was transferred to the anorectal department after 5days of clinical observation in good condition to further treat hemorrhoids.Lessons:PCI is a rare condition that may be secondary to many other diseases. Because of its atypical clinical manifestations, it can be misdiagnosed as other diseases, such as polyps, inflammatory bowel disease, and even cancer. The diagnosis of PCI depends on computed tomography, colonoscopy, and endoscopic ultrasonography. Fine-needle aspiration may be helpful in the diagnosis and treatment of PCI.     

Retraction: Magnetic Fe3O4@NiO hierarchical structures: preparation and their excellent As(v) and Cr(vi) removal capabilities

Retraction of ‘Magnetic Fe₃O₄@NiO hierarchical structures: preparation and their excellent As(v) and Cr(vi) removal capabilities’ by Shouwei Zhang et al., RSC Adv., 2013, 3, 2754–2764, DOI: 10.1039/C2RA22495J.

The Royal Society of Chemistry, with the agreement of the named authors, hereby wholly retracts this RSC Advances article due to concerns with the reliability of the data in the published article. The authors requested to retract this article because they admitted that the TEM characterization of the Fe₃O₄@NiO hierarchical microspheres in Fig. 4c was duplicated from the characterization of Fe₃O₄@NiAl-LDH microspheres in Fig. S4B from a J. Am. Chem. Soc. paper by Mingfei Shao et al. without permission.¹ The authors would like to apologise to the authors of ref. 1, and for any inconvenience to readers.Signed: Shouwei Zhang, Jiaxing Li, Jinzhang Xu and Xiangke WangDate: 11th August 2021Tao Wen was contacted but did not respondRetraction endorsed by Laura Fisher, Executive Editor, RSC Advances     

MR T2W与T1W灌注对良恶性肌骨病变鉴别诊断的价值

目的 对比MR T2w与T1W灌注对良恶性肌骨病变鉴别诊断的效果,评价MR T2W灌注的临床应用价值.方法 94例良恶性肌骨病变先后行MR T1、T2W灌注,记录灌注曲线的形态、造影剂首过(FP)期信号最大增/降幅、信号强度-时间(SI-T)曲线最大斜率和造影剂首过时间.将2种灌注的曲线各分4型,并分别对良恶性病灶SI-T曲线的形态、FP期信号增/降幅、SI-T曲线最大斜率和首过时间进行统计学比较;采用ROC曲线法确定恶性诊断的阈值,计算敏感性、特异性和准确率.观察2种灌注方法显示的最高灌注区一致性程度.结果 (1)12W.I型和Ⅳ型SI-T曲线在良恶性病变的鉴别中有一定参考价值.良恶性病变FP期信号最大降幅与SI-T曲线最大斜率及首过时间比较差别无统计学意义.(2)T1W.I型SI-T曲线多见于恶性病灶.Ⅲ型、Ⅳ型SI-T曲线多见于良性病灶;良性病变的FP期信号增幅均值为29.20%,恶性病变均值为73.92%(P＜0.001);良性病变的SI-T曲线最大斜率均值为3.49.恶性病变均值为9.57(P＜0.001).(3)以首过增幅44.50%作为诊断恶性的界值.其敏感性为98.50%,特异性为86.70%.准确率为88.30%;以SI-T曲线最大斜率5.09作为恶性的界值,敏感性为96.20%.特异性为85.60%.准确率为86.17%.2种研究方法显示最高灌注区位于同一区域14例(14.90%),不同区域80例(85.10%).结论 T2W灌注扫描鉴别良恶性肌骨病变的价值不如T1W灌注.MRT1W和T2W灌注扫描FP期信号变化可能是Gd-DTPA在血管内和血管外间隙共同作用的结果.     

Diffusion-weighted MR study of femoral head avascular necrosis in severe acute respiratory syndrome patients

PURPOSE: To evaluate the apparent diffusion coefficient (ADC) of femoral head avascular necrosis (AVN) in severe acute respiratory syndrome (SARS). MATERIALS AND METHODS: Seventy-nine SARS patients with hip pain underwent both conventional and diffusion-weighted MRI (b-value=0-1000 seconds/mm(2)). The abnormal regions on the diffusion-weighted images were outlined by using the conventional images as guides, and the ADCs were calculated. The ADC differences between normal and AVN femoral heads were compared. RESULTS: Of the 158 hips examined, 28 had AVN (11 with bilateral hip AVN, three with right hip AVN, and three with left hip AVN). The mean ADC was markedly greater in the AVN femoral head (1.66 x 10(-3) mm(2)/second+/-0.20) than in the normal femoral head (0.47 x 10(-3) mm(2)/second+/-0.082; P<0.0001). There was no overlap between the normal and AVN femoral heads. CONCLUSION: DWI can provide valuable information regarding the diffusion properties of femoral head AVN, and markedly increased diffusion was identified in AVN.