Self-assembly preparation of lignin–graphene oxide composite nanospheres for highly efficient Cr(vi) removal

Recently, research interest in the application of lignin is growing, especially as adsorbent material. However, single lignin shows unsatisfactory adsorption performance, and thus, construction of lignin-based nanocomposites is worth considering. Herein, we introduced graphene oxide (GO) into lignin to form lignin/GO (LGNs) composite nanospheres by a self-assembly method. FTIR and ¹H NMR spectroscopy illustrated that lignin and GO are tightly connected by hydrogen bonds. The LGNs as an environmental friendly material, also exhibit excellent performance for Cr(vi) removal. The maximum sorption capacity of LGNs is 368.78 mg g⁻¹, and the sorption efficiency is 1.5 times than that of lignin nanospheres (LNs). The removal process of Cr(vi) via LGNs mainly relies on electrostatic interaction, and it also involves the reduction of Cr(vi) to Cr(iii). Moreover, LGNs still have high adsorption performance after repeating five times with the sorption capacity of 150.4 mg g⁻¹ in 200 mg g⁻¹ Cr(vi) solution. Therefore, the prepared lignin–GO composite nanospheres have enormous potential as a low-cost, high-absorbent and recyclable adsorbent, and can be used in wastewater treatment.

Lignin/GO (LGNs) composite nanospheres were prepared by self-assembly method, which showed excellent adsorption performance for Cr(vi) removal.     

RP-HPLC法测定甲硫氨酸维B1注射液的含量

目的:用HPLC法同时测定复方甲硫氨酸维B1注射液中甲硫氨酸和维生素B1的含量,为复方甲硫氨酸维B1注射液的含量测定提供检测方法,制定质控标准.方法:用十八烷基键合硅胶为填充剂;0.005 mol·L-1庚烷磺酸钠溶液(pH=3.0)与乙腈为流动相,梯度洗脱;检测波长为210 nm;柱温30℃;流速约为1.0 mL·min-1.结果:甲硫氨酸与维生素B1分别能与相邻杂质峰较好分离,甲硫氨酸的浓度在0.10～2.10 mg·mL-1范围内线性相关性良好,维生素B1的浓度在0.011～0.21 mg·mL-1范围内线性相关性良好.结论:该法简便、准确、专属性好,可以用于甲硫氨酸维B1注射液的含量测定.     

对全冠修复体外弹性固位体的临床评价

目的对全冠修复体外的弹性卡环型冠外固位体进行临床评价。方法对全冠修复体上的弹性卡环，按主、客观各3项指标，与金属卡环相比较，并进行卡方检验。结果经2年多应用，弹性卡环与金属卡环的总体满意率分别为90．7％和74．65％，P〈0．01，提示二者间存在极显著的统计学差异。结论就全冠修复体上的卡环型固位体而言，弹性材料为目前的首选，与金属卡环相比，兼具美观、稳固、舒适、易于接受的特点。     

银屑病病人开展强化自我管理行为干预的效果

[目的]探讨应用护理干预强化自我管理行为的方法对银屑病病人心理健康状况及生活质量的影响。[方法]将56例确诊为银屑病的病人按住院先后顺序分为对照组及观察组各28例,对照组给予常规的药物治疗及护理,观察组在此基础上从症状管理、情绪控制、正确用药、健康生活方式等方面实施护理干预,提高病人的自我管理能力。应用抑郁自评量表(SDS)、焦虑自评量表(SAS)、生活质量指数(DLQI)在病人入院当天和出院前1d进行调查,比较两组病人心理健康及生活质量状况。[结果]干预前观察组与对照组心理健康状况及生活质量评分比较差异无统计学意义,干预后两组心理健康状况及生活质量评分比较差异有统计学意义(P<0.05)。[结论]通过强化自我管理行为可明显减轻银屑病病人的焦虑、抑郁状态,提高生活质量。     

Studies on tissue distribution of scutellarin and methyl polyethylene glycol (mPEG)-scutellarin prodrug in mice

This study was to determine tissue distribution and pharmacokinetics of mPEG-scutellarin prodrug (7e), a chemical entity previously shown to have a beneficial effect in cerebral ischemia/reperfusion (I/R) injury. After injecting scutellarin or prodrug 7e, the concentrations of scutellarin and 7e in tissues were determined and the pharmacokinetic parameters were calculated. The results showed that the distribution of scutellarin in tissues was enhanced by PEGylation. The distribution of 7e in brain was approximately 2.1-fold higher than that of scutellarin, indicating that PEGylation increased the brain penetration of scutellarin. We conclude that 7e could exert more effective protection on cerebral I/R injury in mice. This study also provided a simple and convenient strategy to identify novel drugs with potential protective function for I/R injury in mice.     

The oral toxicity of the transgenic Bt+CpTI cotton pollen to honeybees (Apis mellifera)

Transgenic insect-resistant cotton has been planted in China in a large scale and may have adverse impacts on honeybees. Pollens from the transgenic Cry1Ac+CpTI cotton Zhong-41 and the parental cotton Zhong-23 were collected from the field and their impacts on adult worker bees were assessed. Experimental results showed that Zhong-41 pollen had no acute oral toxic effect on worker bees. No significant differences were observed in the superoxide dismutase activity or in the longevity of worker bees fed with diets containing the two cotton pollens. The main reasons for the outcome may be the low expression level of the transgenic proteins Cry1Ac and CpTI in the pollen of Zhong-41 as well as the substantial equivalence in the amounts of gross protein and soluble saccharides for the two cotton pollens. The implications of these results are discussed and further work to be carried out is put forward.     

UVA1 irradiation inhibits fibroblast proliferation and alleviates pathological changes of scleroderma in a mouse model

The purpose of the present study was to compare the effects of different doses of ultraviolet radiation A1 (UVA1) on human fibroblast proliferation and collagen level in a mouse model of scleroderma,so as to identify appropriate irradiation doses for clinical treatment of scleroderma.Monolayer from human fibroblasts was cultured in vitro,and a mouse model of scleroderma was established by subcutaneous injection of 100 μL of 400 μg/mL bleomycin into the back of BALB/c mice for 4 weeks.The mouse models and human fibroblasts were divided into UVA1exposed (100,60 and 20 J/cm 2) and UVA-unexposed groups.At 0,24 and 48 h after exposure,cell proliferation and levels of hydroxyproline and collagen were detected.UVA1 irradiation was performed 3 times weekly for 10 weeks,and the pathological changes of skin tissues,skin thickness and collagen level were observed after phototherapy.Cell proliferation and the levels of hydroxyproline and collagen were inhibited after phototherapy,and there was a significant difference between the UVA1-exposed cells and UVA1-unexposed cells (P < 0.001).In addition,UVA1 phototherapy improved dermal sclerosis and softened the skin,and there were significant differences between the high-dose UVA1 group and the model group,and the negative group (P < 0.05).It is concluded that UVA1 radiation can reduce cell proliferation,and decrease hydroxyproline and collagen levels in a dose-dependent manner in vitro.High-dose UVA1 phototherapy has marked therapeutic effect on scleroderma in the mouse model.Decreased collagen level may be related to the reduced number and activity of cells,as well as inhibition of collagen synthesis.     

岩黄连总碱胶囊在健康受试者体内的药动学研究

目的:建立LC-MS/MS法测定人血浆中脱氢卡维丁的浓度,研究不同剂量岩黄连总碱胶囊在中国健康受试者多次给药后的药动学.方法:采用随机、开放、多剂量给药设计的方法.16名健康志愿者随机分为2个剂量组(2 400 mg和3 200 mg),男女各半,每组8例,分别多次口服岩黄连总碱胶囊,每日1次,连续7 d,第7天在给药...     

复方电解质注射液作添加液汇集血小板的研究

目的探讨复方电解质注射液作添加液（PAS）汇集多人份混合血小板的可行性。方法从400ml全血中分离白膜层（BC）,容量40～45ml,于22℃±2℃静置过夜,将ABO同型的6袋白膜汇集,加200ml复方电解质注射液稀释白膜,稀释后的白膜在温度22℃±2℃的离心机中,以900r／min离心10min。上层富含血小板悬液经白细胞过滤器去除白细胞,并转移到血小板保存袋内,即制备成1个成人治疗量的PAS汇集BC—PCs。结果共制备10个成人治疗量的PAS汇集BC—PCs,其容量、血小板含量、WBC混入量、RBC混入量分别为：（293±22）ml、（3．01±0．29）×10^11、（1．1±0．2）×10^6、（5．9±1．3）×10^3。保存8d后的pH、低渗休克反应率（HSR）、形变能力（ESC）、CD62P表达率、AnnexinV结合率分别为7．10±0．05、（65．6±7．1）％、（7．1±1．6）％、（27．4±3．3）％、（12．0±1．4）％。结论复方电解质注射液作为添加液汇集血小板的方法可行。