mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Isolated segmental, sectoral and right hepatic bile duct injuries

The treatment of isolated segmental, sectoral and right hepatic bile duct injuries is controversial. Nineteen patients were treated over a 26-year period. Group one was comprised of 4 patients in whom the injury was primarily repaired during the original surgery;3 over a T-tube, 1 with a Roux-en-Y. These patients had an uneventful recovery. The second group consisted of 5 patients in whom the duct was ligated;4 developed infection, 3 of which required drainage and biliary repair. Two patients had good long-term outcomes;the third developed a late anastomotic stricture requiring further surgery. The fourth patient developed a small bile leak and pain which resolved spontaneously. The fifth patient developed complications from which he died. The third group was comprised of 4 patients referred with biliary peritonitis;all underwent drainage and lavage, and developed biliary fistulae, 3 of which resolved spontaneously, 1 required Roux-en-Y repair, with favorable outcomes. The fourth group consisted of 6 patients with biliary fistulae. Two patients, both with an 8-wk history of a fistula, underwent Roux-en-Y repair. Two others also underwent a Roux-en-Y repair, as their fistulae showed no signs of closure. The remaining 2 patients had spontaneous closure of their biliary fistulae. A primary repair is a reasonable alternative to ligature of injured duct. Patients with ligated ducts may develop complications. Infected ducts require further surgery. Patients with biliary peritonitis must be treated with drainage and lavage. There is a 50% chance that a biliary fistula will close spontaneously. In cases where the biliary fistula does not close within 6 to 8 wk, a Roux-en-Y anastomosis should be considered.
Impact of mass screening for gluten-sensitive enteropathy in working population

AIM: To assess: (1) frequency and clinical relevance of gluten sensitive enteropathy (GSE) detected by serology in a mass screening program; (2) sensitivity of antitransglutaminase (tTGA) and antiendomysium antibodies (EmA); and (3) adherence to gluten-free diet (GFD) and follow-up.METHODS: One thousand, eight hundred and sixtyeight subjects recruited from an occupational health department underwent analysis for tTGA and EmA and,if positive, duodenal biopsy, DQ2/DQ8 genotyping,clinical feature recording, blood tests, and densitometry were performed. Since > 98% of individuals had tTGA < 2 U/mL, this value was established as the cut-off limit of normality and was considered positive when confirmed twice in the same sample. Adherence to a GFD and follow up were registered.RESULTS: Twenty-six (1.39%) subjects had positive tTGA and/or EmA, and 21 underwent biopsy: six Marsh Ⅲ (one Ⅲa, four Ⅲb, one Ⅲc), nine Marsh Ⅰ and six Marsh 0 (frequency of GSE 1:125). The sensitivity of EmA for GSE was 46.6% (11.1% for Marsh Ⅰ, 100% for Marsh Ⅲ), while for tTGA, it was 93.3% (88.8%for Marsh Ⅰ, 100% for Marsh Ⅲ). All 15 patients with abnormal histology had clinical features related to GSE. Marsh Ⅰ and Ⅲ subjects had more abdominal pain than Marsh 0 ( P = 0.029), and a similar trend was observed for distension and diarrhea. No differences in the percentage of osteopenia were found between Marsh Ⅰ and Ⅲ ( P = 0.608). Adherence to follow-up was 69.2%. Of 15 GSE patients, 66.7% followed a GFD with 80% responding to it.CONCLUSION: GSE in the general population is frequent and clinically relevant, irrespective of histological severity. tTGA is the marker of choice. Mass screening programs are useful in identifying patients who can benefit from GFD and follow-up.
Antisense expression of PKCα improved sensitivity of SGC7901/VCR cells to doxorubicin

AIM: To explore whether antisense blocking of protein kinase C alpha (PKCα) would reverse multi-drug resistance (MDR) in the vincristine (VCR)-resistant human gastric cancer cell line SGC7901/VCR.METHODS: SGC7901/VCR cells expressing antisense PKCα, SGC7901/VCR/aPKC, were established by transfection with a recombinant plasmid reversely inserted with PKCα cDNA. Empty vector (PCI-neo)-transfected cell clones, SGC7901/VCR/neo, served as the control. Western blot method was used to detect PKCα content in SGC7901, SGC7901/VCR, SGC7901/VCR/neo and SGC7901/VCR/aPKC cells, using PKCα-specific antibody. The sensitivity of SGC7901, SGC7901/VCR, SGC7901/VCR/neo and SGC7901/VCR/aPKC cells to doxorubicin (DOX) in vitro was determined by MTT assay. The uptake of DOX in these cells was detected with fluorescence spectrophotometer.RESULTS: Western blot analysis showed that the PKCα protein level was about 8.7-fold higher in SGC7901/VCR cells than that in SGC7901 cells, whereas the protein expression of PKCα was reduced by 78% in SGC7901/VCR/aPKC cells when compared with the SGC7901/VCR cells. SGC7901/VCR/aPKC cells had a 4.2-fold increase in DOX cytotoxicity, accompanied by a 1.7-fold increase of DOX accumulation in comparison with SGC7901/VCR cells.CONCLUSION: PKCα positively regulates MDR in SGC7901 cells, and inhibition of PKCα can partially attenuate MDR in human gastric cancer cells.
Intrahepatic cholestasis of pregnancy: When should you look further?

Pruritis with abnormal liver function tests is the classical presentation of intrahepatic cholestasis of pregnancy (ICP), a condition associated with significant fetal complications. Although the etiology of ICP is unclear in many cases, certain features of the clinical presentation should alert the practitioner to the possibility of an underlying metabolic defect,which may not only affect subsequent pregnancies,but may be an indicator of more serious subsequent liver disease. We report a kindred of Anglo-Celtic descent, among whom many members present with ICP, gallstones or cholestasis related to use of oral contraception. Genetic studies revealed a novel mutation in the ABCB4 gene, which codes for a phospholipid transport protein. The clinical significance of this mutation and the importance of identifying such patients are discussed.
Prophylactic effect of glyceryl trinitrate on post-endoscopic retrograde cholangiopancreatography pancreatitis: A randomized placebo-controlled trial

AIM: To examine the prophy lacticef fect of glyceryl trinitrate on post-endoscopic retrograde cholangiopancreatography (ERCP) pancreatitis and hyperamylasemia.METHODS: Patients scheduled for ERCP were randomly divided into study group and placebo group. Patients in study group and placebo group were treated with 5 mg glyceryl trinitrate and 100 mg vitamin C, respectively, 5 min before endoscopic maneuvers.RESULTS: A total of 74 patients were enrolled in the final analysis. Post-ERCP pancreatitis occurred in 3 patients (7.9%) of the study group and 9 patients (25%) in the placebo group ( P = 0.012).Hyperamylasemia occurred in 8 patients of the study group (21.1%) and 13 patients (36.1%) of the placebo group ( P = 0.037).CONCLUSION: Glyceryl trinitrate before ERCP can effectively prevent post-ERCP and hyperamylasemia.
黄河兰州段典型人工林大型土壤动物群落结构及其多样性

土壤动物是土壤生态系统中的重要组成成分,是生态系统中物质与能量交换的枢纽~([1,2]);同时,土壤动物对环境变化有较好的指示作用.因此,研究人工杨树林下土壤动物群落结构和多样性,对于黄河两岸营造人工林具有重要意义.
长期施肥对华北小麦-玉米轮作土壤物理性质和抗蚀性影响研究

土壤侵蚀是土壤及其母质在水力、风力、冻融、重力等外营力作用下,被破坏、剥蚀、搬运和沉积的过程~([1]),土壤侵蚀的直接后果是降低土壤中有机质和各种营养元素的含量,破坏土体结构,且随着土壤的流失而造成一系列环境问题~([2]),土壤侵蚀及其导致的土壤质量退化是世界性的重大环境问题~([3]).据报道,我国水土流失面积占国土面积的38.2%,其中水蚀面积179×104 km~2,风蚀面积188×104 km~2.
两种生态型东南景天根际与非根际土壤微生物特征的差异性

超积累植物具有很强地忍耐和吸收土壤重金属的能力,导致其根际环境中重金属的平衡和微生物活性及其群落结构发生改变,其原因主要有以下几方面:第一,由于超积累植物快速地吸收土壤中的重金属,可能会导致其根际土壤溶液中的重金属浓度降低,从而缓减重金属对根际土壤中微生物的毒害作用,促进微生物的生产和代谢活动.
水稻土 FDA水解酶活性的测定方法及应用

在土壤质量指标研究中,许多研究人员认为荧光素二乙酸酯(Fluorescein diacetate, 又称3′6′-二乙酰-荧光素,FDA)水解反应能较好地反映土壤微生物活性和土壤质量的变化~([1-3]),将其作为土壤生物学指标之一~([4]).FDA的水解反应最早于1963年由Kramer 和Guibault用来测定脂肪酶的活性~([5]), 直至1980年FDA的水解反应才被用来检测微生物活性~([1]).Swisher 和Carroll报告FDA水解生成荧光素的量与冷杉叶上生长的微生物群体数量成正比;他们同时提出了测定土壤FDA水解酶活性的基本方法.Schnürer 和Rosswall~([2])利用这一反应测定了土壤与秸秆中的总微生物活性及微生物纯培养中的细胞密度.20世纪90年代中后期,这一方法开始被应用到土壤酶学研究中.~([4.6.7])
黑龙江省南部黑土区土壤微量元素空间变异及影响因子——以双城市为例

土壤微量元素的有效态含量水平直接决定植物吸收这些营养元素的状况和动植物的健康~([1]).已有的对中、大尺度有效态微量元素的研究多应用经典统计学方法对其含量及其影响因素进行分析~([2～6]),近10年来,研究者常采用更加科学、直观和方便的地理信息系统(GIS)和地统计学方法研究区域有效态微量元素的空间结构和分布规律~([7]),并应用GIS空间分析功能对其丰缺进行评价~([8,9]),但应用GIS的方法对有效态微量元素的影响因素进行分析的尚不多见.
不同植龄啤酒花根际土壤中有机化合物的初步分离鉴定

植物根际区是土壤中物理、化学、生物学作用极其活跃的特殊微生态系统,在生物与环境的共同作用下,根际土壤中产生很多有机化合物,它们来源于植物体根系分泌、地上部淋溶、植物残茬及土壤生物的分解等~([1]),这些化合物中很多是化感物质,直接或间接地影响着植物的生长发育.化感作用(Allelopathy),即相生相克作用,是指一种植物或微生物(供体)向环境释放化学物质而影响其他有机体包括植物、微生物和动物(受体)的生长和发育的化学生态学现象,包括促进和抑制两方面作用~([1-5]).当受体和供体同属于一种植物时产生抑制作用的现象,称为植物的自毒作用.大多数植物均存在自毒作用,而且研究发现自毒作用经常是作物产生连作障碍的一个主要原因.
皆伐火烧对杉木人工林土壤有机碳和黑碳的影响

黑碳(Black Carbon,BC)是生物质或化石燃料不完全燃烧所形成的一类特殊产物,普遍分布于大气、土壤、冰雪和水以及沉积物中~([1～3]).研究表明,BC是土壤惰性碳库的重要组成部分,在土壤碳循环中占有十分重要的地位~([4,5]).目前,国内外对大气气溶胶、海洋沉积物和雪冰中的BC研究已有大量报道~([6,7]),但对土壤BC的研究较少,特别是国内在这一方面的研究报道还不多见~([2,8,9]).皆伐火烧是人工林经营的重要措施,对人工林土壤碳库具有重要影响~([10～13]),但目前的研究结论尚存在争议.本研究旨在探讨杉木人工林土壤有机碳(SOC)和BC对皆伐火烧的响应,以期为正确评价皆伐火烧对人工林土壤碳库的影响以及为人工林的可持续经营提供科学依据.
Effect of Mg/Al atom ratio of support on catalytic performance of Co-Mo/MgO-Al_2O_3 catalyst for water gas shift reaction

Co-Mo-based catalysts supported on mixed oxide supports MgO-Al_2O_3 with different Mg/Al atom ratios for water gas shift reaction were studied by means of TPR, Raman, XPS and ESR. It was found that the octahedral Mo species in oxidized Co-Mo/MgO(x)-Al_2O_3 catalyst and the contents of Mo~(5+), Mo~(4+), S~(2-) and S_2~(2-) species in the functioning catalysts increased with increasing the Mg/Al atom ratio of the support under the studied experimental conditions. This is favorable for the formation of the active Co-Mo-S phase of the catalysts. Catalytic performance testing results showed that the catalysts Co-Mo/MgO-Al_2O_3 with the Mg/Al atom ratio of the support in the range of 0.475-0.525 exhibited optimal catalytic activity for the reaction.
Transformation of methane to synthesis gas over metal oxides without using catalyst

This article reviews a new developing method in the field of metal oxide reduction in chemical and metallurgical processes, which uses methane as a reducing agent. Commonly, coal is used as the reducing agent in the reduction of metal oxide and other inorganic materials; Metal producing factories are among the most intensive and concentrated source of greenhouse gases and other pollutants such as heavy metals, sulfur dioxide and fly ash. Thermodynamically, methane has a great reducing capability and can be activated to produce synthesis gas over a metal oxide as an oxygen donor. Metal oxide reduction and methane activation, two concurrent thermochemical processes, can be combined as an efficient and energy-saving process; nowadays this kind of technologies is of great importance. This new reduction process could improve energy efficiencies and significantly decrease greenhouse gas emission compared to the conventional process; furthermore, the produced gases are synthesis gas that is more valuable than methane. In this paper, thermodynamic studies and advantages of this promising method were discussed. The major aim of this article is to introduce methane as a best and environmentally friendly reducing agent at low temperature.
Adsorption separation of carbon dioxide, methane and nitrogen on monoethanol amine modified β-zeolite

A new type of composite adsorbents was synthesized by incorporating monoethanol amine (MEA) into β-zeolite. The parent and MEA-functionalized β-zeolites were characterized by X-ray diffraction (XRD), N_2 adsorption, and thermogravimetric analysis (TGA). The adsorption behavior of carbon dioxide (CO_2), methane (CH_4), and nitrogen (N_2) on these adsorbents was investigated at 303 K. The results show that the structure of zeolite was well preserved after MEA modification. In comparison with CH_4 and N_2, CO_2 was preferentially adsorbed on the adsorbents investigated. The introduction of MEA significantly improved the selectivity of both CO_2/CH_4 and CO_2/N_2, the optimal selectivity of CO_2/CH_4 can reach 7.70 on 40 wt% of MEA-functionalized β-zeolite (MEA(40)-β) at 1 atm. It is worth noticing that a very high selectivity of CO_2/N_2 of 25.67 was obtained on MEA(40)-β. Steric effect and chemical adsorbate-adsorbent interaction were responsible for such high adsorption selectivity of CO_2. The present MEA-functionalized β-zeolite adsorbents may be a good candidate for applications in flue gas separation, as well as natural gas and landfill gas purifications.
Evaluation of Soil Quality Indicators in Sugarcane Management in Sandy Loam Soil

An important factor for the sustainability of soils highly susceptible to degradation is the use of monitoring tools that promptly and realistically reflect changes imposed on soil by different cropping systems.To select soil quality indicator variables in sugarcane (Saccharum offcinarum L.) production areas that fulfill the criteria of sensitivity to management practices and between-season consistency in the management discrimination,ten composite soil samples (0-10 cm) were collected in July 2005 (rainy season) and again in March 2006 (dry season) from areas under cultivation of organic sugarcane (OS),green sugarcane (GS),burned sugarcane (BS) and from an adjacent native forest (NF) area at Usina Triunfo,Boca da Mata,Alagoas,Brazil.Microbial biomass-C (MBC),total organic C (TOC),soil enzyme activity expressed as the rate of fluorescein diacetate (FDA) hydrolysis,mean weight diameter of water-stable soil aggregates (MWD),and percentage of water-stable macroaggregates (PWSA) were analyzed.Although MBC and TOC were higher in NF than in the cultivated areas,no differences were observed in these C pools between the three sugarcane systems.The response of FDA to the site management was dependent on the sampling time.In the rainy period,the activity followed the order:NF ＞ OS ＞ GS ＞ BS,whereas in the dry season,only NF differed from the other treatments.Irrespective of the sampling time,MWD and PWSA decreased in the order NF ＞ OS = GS ＞ BS.The variables MWD and PWSA are quite sensitive for discriminating between site management histories regardless the sampling season.
Bioremediation of Oil Spills in Cold Environments: A Review

Oil spills have become a serious problem in cold environments with the ever-increasing resource exploitation,transportation,storage,and accidental leakage of oil.Several techniques,including physical,chemical,and biological methods,are used to recover spilled oil from the environment.Bioremediation is a promising option for remediation since it is effective and economic in removing oil with less undue environmental damages.However,it is a relatively slow process in cold regions and the degree of success depends on a number of factors,including the properties and fate of oil spilled in cold environments,and the major microbial and environmental limitations of bioremediation.The microbial factors include bioavailability of hydrocarbons,mass transfer through the cell membrane,and metabolic limitations.As for the environmental limitations in the cold regions,the emphasis is on soil temperatures,freeze-thaw processes,oxygen and nutrients availability,toxicity,and electron acceptors.There have been several cases of success in the polar regions,particularly in the Arctic and sub-Arctic regions.However,the challenges and constraints for bioremediation in cold environments remain large.
Land Use Changes of an Aeolian-Loessial Soil Area in Northwest China: Implications for Ecological Restoration

China has experienced dramatic land use changes over recent decades,with marked environmental and socio-economic consequences.Hcngshan County,located in the aeolian-loessial area of Northwest China,was investigated to illustrate land use changes and their implications for environmental and long-term rural economic development.The farmland in Hengshan County significantly decreased during 1990-2003,whereas forest land and grassland increased.The conversion rates of farmland,orchard land,forest land and construction land varied markedly among different periods:1990-1995,1995-2000 and 2000-2003.Conversion of orchard land,grassland and construction land was dominant in 1990-1995,whereas the conversion of farmland to forest land mainly occurred in 2000-2003.The results suggested a profound transition in institutional policy and political economy of land management,including implementation of integrated soil erosion control projects,adoption of a market-oriented economy and the 'Grain-for-Green' policy,during this period in China.To achieve long-term sustainable land use in Hengshan County,efforts should aim at increasing off-farm income of rural families as well as establishing land-economizing mechanisms to promote land productivity,in addition to conservation measures.
Growth and Phosphorus Uptake of Oat (Arena nuda L.) as Affected by Mineral Nitrogen Forms Supplied in Hydroponics and Soil Culture

Plants show different growth responses to N sources supplied with either NH4+ or NO3-.The uptake of different N sources also affects the rhizosphere pH and therefore the bioavailability of soil phosphorus,particularly in alkaline soils.The plant growth,P uptake,and P availability in the rhizosphere of oat (Arena nuda L.) grown in hydroponics and in soil culture were investigated under supply with sole NH4+-N,sole NO3--N,or a combination.Sole NO3-fed oat plants accumulated more biomass than sole NH4+-fed ones.The highest biomass accumulation was observed when N was supplied with both NH4+-N and NO3--N.Growth of the plant root increased with the proportion of NO3-in the cultural medium.Better root growth and higher root/shoot ratio were consistently observed in NO3--fed plants.However,root vigor was the highest when N was supplied with NO3-+NH4+.NH4+ supply reduced the rhizosphere pH but did not affect P uptake by plants grown in soils with CaHPO4 added as P source.No P deficiency was observed,and plant P concentrations were generally above 2 g kg-1.P uptake was increased when N was supplied partly or solely as NO3--N,similarly as biomass accumulation.The results suggested that oat was an NO3-prcferring plant,and NO3--N was essential for plant growth and the maintenance of root absorption capacity.N supply with NH4+-N did not improve P nutrition,which was most likely due to the absence of P deficiency.
Heavy Metal Transfer from Soil to Vegetable in Southern Jiangsu Province, China

Vegetable fields in peri-urban areas receive large amounts of extraneous heavy metals because of rapid urbanization and industrialization in China.The concentrations of Cu,Zn,and Pb in 30 soil samples and 32 vegetable samples,collected from 30 different sites in southern Jiangsu Province of China,were measured and their transfer from soil to vegetable was determined.The results showed that the soil samples had wide ranges of pH (4.25-7.85) and electrical conductivity (EC) (0.24-3.42 dS m-1).Among the soil samples,there were four soil samples containing higher Cu and two soil samples containing higher Zn concentrations than those specified in the Chinese Soil Environmental Quality Standard II.However,no vegetable sample was found to contain a high level of Cu or Zn.In contrast,one vegetable sample contained 0.243 mg Pb kg-1 FW,which was above the Chinese Food Hygiene Standard,whereas the corresponding soil Pb concentration was lower than the Chinese Soil Environmental Quality Standard II.The transfer coefficients of Cu of all vegetable samples exceeded the suggested coefficient range,implying that extraneous Cu had high mobility and bioavailability to vegetables.There was no significant correlation between extractable soil heavy metal concentrations with four kinds of extractants and soil pH,EC,heavy metal concentrations in vegetables and soils,except that soil pH correlated well with the extractable soil Cu,Zn,and Pb concentrations with 1.0 mol L-1 NH4NO3.Moreover,diethylenetriamine pentaacetic acid (DTPA)extraction method was a more efficient method of extracting heavy metals from the soils independent of soil pH and EC than other three methods used.
Genetic varition of miRNA sequence in pancreatic cancer

MicroRNAs(miRNAs) are small non-coding RNAs of 20-22 nucleotides(nts)and constitute a novel class of gene regulators that negatively regulate gene expression at the post-transcriptional level The expression of miRNA is deregulated in many types of cancers. Alterations in miRNA expression may be an important contributor to the development of pancreatic carcinoma. We hypothesized that genetic variations in miRNA genes were associated with pancreatic carcinoma and analyzed genomic sequences coding for the precursors of eight miRNA genes in both pancreatic carcinoma tissues and cancer cell lines. Four novel mutations in Primary miRNA transcripts were identified. TaqMan miRNA assays showed that miR-21 was significantly overexpressed in 20 pancreatic carcinomas and 6 cancer cell lines compared with paired benign tissues and normal pancreas. Two mutations of miR-21did not notably alter the activity of the promoter of the miRNA gene. Although most of these mutations seem to have no effect on miRNA processing, an A-G mutation at 29-nt downstream of pre-miR-21 led to a conformational change of the secondary structure close to the stem reaching into the pre-miR-21 and a relative reduction of the mature miR-21 expression in vivo. These results suggested that miRNA might play an important role in pancreatic tumorigenesis, but the molecular mechanism underlying the particular sequence variations in miRNA that can cause aberrant expression remains to be determined.
Molecular properties, functions, and potential applications of NAD kinases

NAD kinase catalyzes the phosphorylation of NAD(H)to form NADP(H), using ATP as phosphoryl donor. It is the only key enzyme leading to the de novo NADP~+/NADPH biosynthesis. Coenzymes such as NAD(H)and NADP(H)are known for their important functions. Recent studies have partially demonstrated that NAD kinase plays a crucial role in the regulation of NAD(H)/NADP(H)conversion. Here, the molecular properties, physiologic functions, and potential applications of NAD kinase are discussed.
大骨节病(发生在中国的一种地方性骨关节病)关节软骨代谢

目的 本研究旨在了解大骨节病(KBD,在中国发生的一种地方性骨关节病)患者软骨CD44和蛋白聚糖的代谢及相关影响.方法 用免疫组织化学方法分析分化抗原-44(CD44)、BC-13以及3-B-3(-)在所采集KBD患者和正常人软骨切片中的表达;采用夹心酶联免疫吸附测定法检测血清中可溶性CD44(sCD44)、白介素-1β(IL-1β)、肿瘤坏死因子α(TNF-α)以及基质金属蛋白酶-1的水平.结果 苏木素&伊红(HE)染色以及甲苯胺兰染色显示,在KBD病患儿以及成人软骨中有细胞坏死和蛋白聚糖的缺失;免疫组织化学染色发现,KBD成人和儿童患者软骨组织中CD44、BC-13和3-B-3(-)具很强的阳性表达;sCD44、IL-1β和TNF-α在KBD成人和儿童血清的水平明显高于正常成人及儿童对照组,经统计学分析具显著性差异.有意思的现象是,KBD病区正常儿童血清中IL-1-β和TNF-α的水平亦明显高于非KBD病区正常儿童的水平,这些都提示可能还有一些未被确定的因素(例如遗传因素)或许对KBD发病具有一定的影响.结论 大骨节病患者CD44、IL-1β和TNF-α代谢发生的改变,以及KBD成人和儿童软骨由于聚集蛋白聚糖酶活性增强所产生的蛋白聚糖的丢失,可能是KBD发病机理中起关键作用的重要因素,可以引起病态的关节形成和关节的不稳定,这些都可以导致在KBD患者中发生继发性的骨性关节炎.
北京市售代用茶中八氯二丙醚残留情况调查

目的 了解代用茶中八氯二丙醚(S-421)残留现状.方法 对花类、叶类、果类3大类、26个品种共120个代用茶产品进行检测.结果 共检测120个代用荼产品,其中共有56个样品检出八氯二丙醚,检出率为47%.采用欧盟＜0.01mg,kg的标准做为限量,共有19个样品超标,超标率为16%.结论 样品中S-421残留情况以花类最为严重(检出率59%,超标率20%),叶类其次(检出率55%,超标率17%),果类样品残留情况最轻(检出率25%.超标率10%).
化妆品中β-熊果苷稳定性研究

目的 研究β-熊果苷在化妆品使用过程中转化为氢琨的可能性和条件,以及促进转化的因素.方法 分别用高效液相色谱法检测以下3种情况β-熊果苷和氢琨变化:(1)β-熊果苷原料在pH5.2酸性溶液中反应72小时后;(2)在不同pH值和人工汗液条件下,β-熊果苷与β-葡萄糖苷酶反应后;(3)β-熊果苷与人表皮微生物孵育48h.结果 β-熊果苷在酸性条件下室温静置72小时未分解为氢琨;β-熊果苷可被人表皮微生物和β-葡萄糖苷酶水解为氢琨,且酸性环境和人工汗液可促进β-葡萄糖苷酶对β-熊果苷的水解,并以人工汗液促进作用更强.结论 化妆品在正常可预见的使用条件下,其所含β-熊果苷可水解为氢琨被人体吸收.
Limonene as Green Inhibitor for Steel Corrosion in Hydrochloric Acid Solutions

The inhibition of steel corrosion in hydrochloric acid solutions by limonene, which was extracted from citrus and orange fruit, was studied using measurements of mass loss, electrochemical polarisation and electrochemical impedance spectroscopy (EIS) methods. Naturally, the substance reduced the rate of corrosion. The linearity of the cathodic curves for all concentrations indicated that the law of Tafel was followed. The effectiveness of inhibition increased with the increase in concentration of limonene and this exceeded 72% at 0.220 g. L~(-1). The inhibition efficiency is temperature independent in the temperature range of 298-328 K. Adsorption of the substance on the surface of steel obeys the Frumkin isotherm model.
研华PCM-3614I用于智能型自动车租赁系统

设备管理地点:荷兰系统介绍:为了减少污染,提高出行效率,许多国家都在鼓励复兴自行车出行方式.推广成功与否的关键在于日常租用自行车的便利性,过去人们在哪里租赁自行车必须同样归还到那里去,但是人们的出行不可能总限于某一个地点,因此十分不方便.
儿童精神性聋二例

1 病例报告病例1,女,12岁.一个月前不明原因自觉右耳听力下降伴耳痛不适,无耳鸣及眩晕等症状.无耳外伤及耳聋家族史.曾就诊于某医院,诊断为"右耳突发性聋",治疗20余天未见好转,故到邯郸市第三医院求治.