乳腺钼靶片计算机光密度测定的临床应用研究

目的：利用计算机对乳腺钼靶片上病灶中心及病灶周围影像光密度的测定，来探索良、恶性乳腺病变之间以及各种病变病灶中心与病灶周围影像的密度差异：探讨病理基础和临床意义。材料和方法：随机选取１００例临床可扪及乳腺＂肿块＂的女性病人，进行乳腺钼靶Ｘ线检查，将检出病变的１０２张钼靶片进行计算机处理后，对病灶中心及病灶周围组织影像的光密度进行测定。所有病例除炎性病变外均取得病理结果。结果：１．良性病变的病灶中心密度与病灶周围密度无显著差异（Ｐ＞０．５），良性肿块（指纤维腺瘤和囊肿）的病灶中心与病灶周围密度间仅提示一种可能存在显著差异的趋势（０．１＞Ｐ＞０．０５）；２．乳腺癌病灶中心与病灶周围密度之间存在非常显著的差异（Ｐ＜０．００１）；３．良、恶性肿瘤病灶中心密度之间存在较显著差异（Ｐ＜０．０５）。结论：本研究的结果有助于乳腺良、恶性病变的鉴别诊断和提高早期乳腺癌的检出率。     

Molybdate repair of molybdopterin deficient mutants from Chlamydomonas reinhardtii

Summary The phenotypically wild strain I₃ of Chlamydomonas reinhardtii, carrying a cryptic mutation at the nit-6 locus, was distinguished from strains 21gr (cryptic mutant at nit-5) and 6145c (wild type) because of the ability of I₃ to grow on nitrate media containing 2mM tungstate.Molybdopterin-cofactor (MoCo) mutants 102 (double mutant at nit-5 and nit-6) and 104 (mutant at nit-4) grew on nitrate media supplemented with high concentrations of molybdate, although final cell densities were 40–60% lower and generation times 3.5 to six fold longer than for wild type. Under these conditions, nitrate reductase (NR) activity of the mutants, when measured either in situ or in vitro, was practically undetectable. The MoCo defective mutant 307 (nit-3) was not molybdate repairable. Although NR activity was not restored in vitro by molybdate in any of the MoCo^– mutant strains, their extracts had free NR-diaphorase subunits together with NR-subunits assembled into high molecular weight species.Our results indicate that: a) nit-4, nit-5 and nit-6 loci are responsible for molybdate processing in the cell; b) nit-3 may encode a component of the pterin moiety biosynthetic route; c) NR subunits can assemble in the presence of an inactive MoCo; d) high concentrations of molybdate can replace partially in vivo but not in vitro the function of nit-4 and the combined function(s) of the nit-5 and nit-6 gene products.     

乳腺钼靶摄影中钙化对乳腺疾病的诊断价值分析

目的：探讨乳腺摄影中各种钙化形式对乳腺疾病的诊断价值。方法：采用美国GE公司生产乳腺机800T进行轴位（CC位）、斜位（MLO位）摄影。结果：经手术或活检病理证实在乳腺钼靶摄影中所见钙化118倒，其中良性钙化72例，多表现为粗大、空泡、团块状。恶性钙化46例，多表现为细沙、针尖、小叉、小杆状。结论：钙化发生部位、钙化形态、数目、密度等对乳腺疾病正确诊断具有重要意义。     

钼靶X线检查在乳腺癌诊断中的应用价值

目的：探讨乳腺癌诊断中应用钼靶X线检查的价值,提高乳腺癌的早期诊断率。方法回顾性分析经手术病理确诊的66例乳腺癌患者的临床及钼靶X线检查影像资料。结果66例乳腺癌患者钼靶X线片大部分有较敏感的显影及直接征象和间接征象,均行乳腺癌根治术或改良根治术,钼靶诊断与术后病理诊断符合率为100％。结论钼靶X线检查可以大大提高乳腺癌的诊断准确率,对乳腺癌的早期明确诊断具有重要的意义,可作为早期乳腺癌诊断的首选方法。     

钼对缺硒大鼠心肌线粒体功能的影响

本文以克山病病区粮喂养大白鼠造成缺硒动物模型，以病区粮加钼作为处理因素，对大鼠心肌线粒体ＳＤＨ，ＣＣＯ活力及氧化磷酸化效率（Ｐ／Ｏ比值）做了测定。结果显示，钼对上述测定指标均有不同程度的改善，大剂量钼（４０ｍｇ／ｋｇ饲料）的作用优于小剂量钼（２．０ｍｇ／ｋｇ饲料），且与对照组相比有显著的统计学意义。此外，小剂量钼也能明显提高心肌线粒体ＳＤＨ活力。实验结果提示，改善心肌线粒体呼吸链功能及氧化磷酸化效     

乳腺癌的钼靶X线诊断

目的 分析乳腺癌钼靶X线征象及诊断.方法 回顾性分析经手术病例证实的45例乳腺癌患者的钼靶X线征象.结果 45例乳腺癌中,发病部位在外上象限21例,占46.7%;显示为肿块影38例,占84.4%,钙化24例,占53.3%,结构紊乱17例,占37.8%,毛刺31例,占68.9%,乳头凹陷18例,占40.0%,皮肤增厚21例,占37.8%.结论 乳腺癌具有多种X线征象,钼靶X线摄影对乳腺癌诊断具有重要价值.     

葛根及其种植土壤中钼的单扫描极谱测定法

目的 建立一种新的测量葛根及其种植土壤中钼含量的方法.方法 于2005年11月,在江西省上饶横峰葛基地种植区采集葛根及其所在地区的土壤,采用微波消解单扫描极谱法测定葛根及其种植土壤中钼元素的含量,并与原子吸收法测定结果进行比较、分析.结果 该方法钼的一阶导数电流与钼的浓度的关系曲线的回归方程为:y=0.004 1 000x;线性范围为0.010-1.0μg/ml,r=0.999 0,其检出限为6.0x10-3μg/ml.加标回收率为98.0%-106.0%,RSD为2.2%-4.8%.该法与原子吸收法测定结果比较,经t检验,差异均无统计学意义(P＞0.05).结论 采用单扫描极谱法测量土壤及葛根钼含量,具有结果准确可靠,方法简便快速等特点,值得推广.     

乳腺常见疾病的钼靶X线诊断

目的通过分析337例乳腺病变的钼靶X线征象,总结出各种病变的特征性表现,以提高乳腺疾病的钼靶X线诊断水平。方法337例均进行钼靶照片。乳腺导管内乳头状瘤患者除照乳腺平片外,尚进行溢乳导管造影。所有病例均经手术或穿刺病理证实。结果良性病变中以乳腺增生症、纤维腺瘤、乳腺囊肿、乳腺导管内乳头状瘤和炎症多见,良性肿块边缘光滑、锐利、密度均匀,钙化较粗大,肿块直径X线测量值等于临床测量值。乳腺癌主要表现为肿块,边缘不光整,有分叶和毛刺,钙化细小、成簇、泥沙样,肿块直径X线测量值<临床测量值。结论乳腺钼靶X线照片对乳腺病变的发现及良、恶性病变的鉴别诊断有很大价值。     

微波消解-钼蓝比色法测定肉制品中磷酸盐

目的：建立微波消解-分光光度法进行肉制品中磷酸盐的测定。方法：运用微波消解技术进行样品消解,再以钼蓝比色法进行含量测定。结果：本法的精密度RSD（%）在1.1～3.4之间,回收率（%）在86.1～87.6之间。结论：利用微波消解技术进行肉制品中磷酸盐的含量测定,缩短了消解时间,简化了操作步骤,并使精密度和准确度均得到改善。     

The bicistronic MOCS1 gene has alternative start codons on two mutually exclusive exons

The bicistronic MOCS1 gene encodes two enzymatic activities that are necessary for the biosynthesis of the molybdenum cofactor (MoCo). Mutations in either of the two consecutive open reading frames are responsible for the majority of MoCo deficiency cases and result in a complementation group A phenotype. Two cDNA sequences have been described, which differ in the 5' sequence and encode for two forms of the protein MOCS1A with variable N-terminal sequences. We have reinvestigated the corresponding region by means of cDNA analysis and databank searches. This revealed three different splice variants, including two mutually exclusive first exons and a facultative intron. All three forms can be found in eight different human tissues in a constant ratio, which excludes tissue specificity of the different isoforms.