54 resultados para Bernini, Gian Lorenzo, 1598-1680
Resumo:
Porphyra haitanensis T. J. Chang et B. F. Zheng (Bangiales, Rhodophyta) is cultivated in China and widely consumed in Asia. To gain more insight into its physiological and biochemical properties, we generated 5318 expressed sequence tags (ESTs) from the sporophyte of P. haitanensis, and upon assembling into a nonredundant set, 2535 sequences were obtained, among which only 32.2% (816) shared certain similarity with published sequences (Nr and KOG). Functional classification of such ESTs revealed that most of the transcripts were related to its conservative biological metabolism, and P. haitanensis most likely possesses cyanide-resistant respiration and a C4-like carbon-fixation pathway, both of which have never been reported in a rhodophyte before. Twenty-eight percent of the nonredundant gene clusters exhibited significant similarity to those from P. yezoensis Ueda sporophytes, and 16 genes up-regulated in P. yezoensis sporophytes were also expressed abundantly in P. haitanensis. Codon usage analysis indicated that exposure to high GC pressure might occur during evolution of P. haitanensis. These findings represent the most extensive collection of ESTs from P. haitanensis to date, and all the ESTs in this study have been submitted to GenBank (accession nos. DN604790-DN608469, EG016226-EG018540).
Resumo:
Further chemical investigation of the stem bark of Aglaia cordata has led to the isolation and identification of three new lignans, namely, aglacins I-K (1-3), all of which contain two contiguous trimethoxylated phenyl systems. Among them, aglacins I and J (1 and 2) are new members of the aryltetralin cyclic lactol class, while aglacin K (3) is a new example of tetralrydrofuran lignan. The structures of these compounds were established on the basis of spectroscopic data interpretation.
Resumo:
2007年夏季对黄海冷水团及邻近海域共48个站位的小型底栖动物组成、丰度和生物量,以及环境因子进行了科考研究。所调查站位的小型底栖动物平均丰度达2194 ± 1598 inds./10cm2,其中北黄海17个站位平均丰度为3408 ± 1578 inds./10cm2,南黄海31个站位平均丰度为1529 ± 1121 inds./10cm2。调查站位平均生物量为1839 ± 1289 g dwt/10cm2,其中北黄海站位平均生物量为2760 ± 1340g dwt/10cm2,南黄海平均生物量为1335 ± 902g dwt/10cm2。在分选出的共18个小型底栖动物类群中,丰度上均以自由生线虫占绝对优势,达总量的88%,且在南(88.3%)、北黄海(87.7%)基本无差异。在生物量上,同样以自由生线虫贡献最多(42%),多毛类居次(22%),其他生物量较多的还有桡足类(13%)和甲壳类幼体(12%)。在小型底栖动物的垂直分布上,分布于沉积物表层0-2cm的小型底栖动物占79%,次表层2-5cm占17%,最底层5-8cm仅占4%。统计分析表明研究站位小型底栖动物丰度和生物量与沉积物叶绿素a、有机质含量、中值粒径显著或极显著正相关,与水深呈极显著负相关,此外小型底栖动物生物量与沉积物粉砂粘土含量显著负相关。 同年秋季搭载开放航次对黄海5个站位、东海3个站位、南海2个站位的小型底栖动物组成、丰度和生物量,以及环境因子进行了调查研究。对三个海域小型底栖动物的比较研究发现,平均丰度以黄海最高,达2132 ± 946 inds./10cm2,东海次之,为1954 ± 2047 inds./10cm2,而南海仅156 ± 56 inds./10cm2;三海域的平均生物量依次为2193 ± 1148 g dwt/10cm2、1865 ± 1555 g dwt/10cm2和212 ± 22 g dwt/10cm2。在分选出的共14个小型底栖动物类群中,丰度上均以自由生线虫占绝对优势,分别占总量的85%、89%、85%。在生物量上,黄海以自由生线虫贡献最多(33%),多毛类居次(18%);东海二者比例相近(约37%),而南海则以多毛类占绝对优势(56%),线虫居次(25%)。在小型底栖动物的垂直分布上,三个海区差异较大:分布于沉积物表层0-2cm的小型底栖动物在黄海高达90%,东海仅46%,在南海为63%。统计分析表明,本研究站位小型底栖动物丰度与沉积物中的叶绿素a及脱镁叶绿素a含量和底温呈显著正相关,与水深呈显著负相关。该结果与本航次之后在广东湛江和海南以东的南海海域开展的908调查结果形成了鲜明对照,后者的小型底栖动物及线虫丰度与沉积物中有机质含量呈显著正相关,与水深呈显著负相关,表明近海受人类干扰影响较大。 本文利用微宇宙实验方法,来确定不同浓度梯度的Cu、Pb以及Cu/ Pb混合重金属污染物对青岛湾小型底栖动物(主要是线虫)的影响。加入污染物后,分别在1、3、7、14、21天进行取样分析。结果显示,Cu和Cu/Pb混合高浓度实验单元组的线虫丰度除在第21天有较明显减少外,在整个实验周期内基本没有变化,分析可能系高浓度Cu的固定作用从而使小型底栖动物无法腐烂降解造成的。同一时间尺度上,各重金属污染物实验单元的线虫丰度均高于(或接近于)空白对照组,较高浓度的重金属污染物实验单元的线虫丰度高于(或接近于)较低浓度重金属污染物实验单元,Cu/Pb混合低浓度实验单元的线虫丰度高于同一时间尺度Cu低浓度和Pb低浓度实验单元。推测是由于采样点的线虫群落中存在对Cu和Pb的耐受种或者“机会种”造成的。
Resumo:
MP-25 resin is a chlorine-containing polymer widely used in coatings. The effects of two types of nano-TiO2 (P-25 and RM301 LP) on MP-25 were studied with saline immersion, UV irradiation, and electrochemical impedance spectroscopy. UV irradiation was evaluated in terms of gloss change and X-ray photoelectron spectroscopy (XPS). The results indicate that, compared to pigment R-930 TiO2, P-25 reduced the immersion resistance and accelerated UV aging of the MP-25 coating, whereas RM301 LP showed the opposite effects. XPS analysis showed that MP-25 resin degraded under UV irradiation via dechlorination and C-C bond breakage, similarly to poly(vinyl chloride), but RM301 LP could inhibit the aging of MP-25 to a certain extent. A skin effect of oxygen and chlorine was identified in MP-25 resin by XPS. RM301 LP could improve the impedance of the MP-25 coating because of its excellent fill capacity. Hence, rutile nano-TiO2 RM301 LP represents an excellent additive for MP-25 resin. (c) 2007 Wiley Periodicals, Inc.
Resumo:
Jiuquan basin, located in the middle of the Hexizoulang, is one of the major important Mesozoic、cenozoic oil-gas bearing basin in the west of China. Jiuquan basin is composed of Jiuxi depression、Huahai-jinta depression and Jiudong depression. Basement of Jiudong depression is Silurian shallow metamorphic rock. Ying-er sag , focus of this study, is the biggest sag in Jiudong depression and the targeting study object is cretacic strata. Structure evolution and geological background were carefully studied in this research. A series of methods were applied to this research: values of oxygen and carbon isotope and trace elements analysis were used to recover salinity of the palae-lake water of the sag. The evolution and distribution of sedimentary faces were carefully studied. Also, various analysis and tests were made to study the diagenesis of the reservoir sandstones、porosity evolution and porosity distribution. All the studies indicate that sedimentary faces are main macroscopic factor controlling the reservoir quality; Compaction is the main factor destroying reservoir property. Carbonate cements greatly preserved the porosity in eodiagenesis because it had prevented significant early mechanical compaction and its dissolution in the late diagenesis generated secondary pores. Carbonate cements in the late diagenesis occluded primary porosity and played a negative role in the porosity preservation. Source of the carbonate cements were also preliminarily discussed. Feldspar grains and lithic fragments were dissolved by acid fluid and formed a great amount of secondary pores and developed the reservoir quality. Also, sedimentary-diagenesis zones were identified. On basis of these studies, Reservoir forming factors were studied. Keywords: Jiudong depression, sedimentary faces,reservoirs diagenesis reservoir evaluation,secondary pores
Resumo:
Hydrochemistry, isotope and CFCs were used to determine groundwater transport in the eastern part of the Guanzhong Basin. In this paper, we systematically collected water samples and measured major ions, 2H-18O and CFCs in surface water and shallow groundwater. Groundwater in this region can be divided into three categories based on total dissolved solids (TDS): fresh water with TDS < 1g/L, brackish water with TDS between 1~3g/L, and saline water with TDS > 3g/L. Saline water is mainly located in the north of the Wei River, and saline groundwater is not in the south. Tributaries in the south of the Wei River and underlain groundwater had similar 2H-18O values, indicating a close hydraulic connection between them. Tributaries in the north of the Wei River characterized certain extent of evaporation, and 2H-18O values deviated to a differing extent between surface water and groundwater, indicating that surface water in the north bank of the Wei River has little hydraulic connection with underlain groundwater. The CFCs age of groundwater from the piedmont recharge area was young, and became older toward the Wei River valley. Vertically, the CFCs age of groundwater increased with well depth. The shallow groundwater is mainly composed of young water with ages < 60 years and old water with ages > 60 years. Young water is in a larger proportion. The NO3-N concentration positively correlates with the CFC-12 concentration in the groundwater, which indicates that young water is subjected to be contaminated. Keyword: Guanzhong Basin , shallow groundwater, isotope, CFC
Resumo:
迄今为止,铊成矿仅见我国,故研究铊成矿我国应是首开先河。从铊矿床成矿作用研究铊矿床地质地球化学特点,其目的在于强调从生物成矿角度研究微古生物在新陈代谢过程中吸收富集铊成矿和生物残骸积累铊成矿。进而从本质上认识铊在成矿演化过程中地质地球化学和生物化学等多种因素相互作用的特殊成矿机制.
Resumo:
矿山开发造成的生态环境问题是一个世界性的问题,国内外许多学者对此表现出浓厚的兴趣。除矿山开发直接导致的植被破坏和耕地侵蚀等外,研究者更重视有害物质(特别是重金属)释放而导致的环境问题,特别是表生条件下矿山废弃物(矿山尾砂)的堆积,在一系列地球化学因素的作用下:如矿山尾砂的矿物成分 参考、堆积时间、厚度、气候条件及微生物(Rachel,2002)等发生风化作用,从而导致酸性矿山废水(AMD)的产生。蓄纳高浓度的重金属元素,其排放小仅对溪流、河流、湖泊水质及其沉积物产生负而影响,而且有降低土壤环境质量状况的威胁(Barbara Hohn,2005)。 贵州省赫章县是我国著名的土法炼锌集散地,地处贵州西北部,辖内煤炭资源丰富,境内的榨子厂、猫猫厂、天桥铅、锌矿(氧化矿)为“土法炼锌”提供了丰富的原料。其土法炼锌已有300多年的历史,至2000年,已有1000多个土法炼锌“马槽炉”的规模。炼锌中产生的黑色烟尘不仅使周围山坡寸草不生,山坡上、河道边到处倾倒着废渣,而且使许多早作地荒耕。本文试图以该地的土法炼锌为研究对象,探讨土法炼锌中产生的烟尘和废弃物对附近土壤和沉积物的环境影响。 1.1矿山开发中的生态环境影响 矿山的开采在很大程度上改变了矿山原有的环境。矿山开采耗费大量的土地资源,开采后破坏的土地,丧失原有的自然生态系统;废弃物堆置场是周围环境的严重污染源。矿山按其产品性质分类,有冶金矿山(黑色金属、有色金属、稀土元素、放射性元素等)和非金属矿山(煤矿、石料、陶土等);按其开采方式分类,有露天开采矿山和地下开采矿山。不同性质的矿山和不同的开采方式,其对生态环境破坏的过程和特征有很大差异。 矿山开采引起的生态破坏,主要由以下三个过程导致:(1)开采活动对土地的直接破坏,如露天开采会直接毁坏地表土层和植被,地下开采会导致地层塌陷,从而引起土地和植被的破坏:(2)矿山开采过程中的废弃物(如尾矿、矸石等) 需要大面积的堆置场地,从而导致大量占用土地和对堆置场原有生态系统的破坏;(3)矿山废弃物中的毒性成分,可通过径流和大气飘尘,影响周围的土地、水域和大气质量(Ivanova,2001)。 在生态系统层次上,上述三个过程对采矿地区生态的破坏具有三个特征:(1)景观破坏,主要指对地貌的影响;(2)环境质量退化,对所在地区土质、水质,甚至大气质量的影响;(3)生物多样性退化,对原有生物群落的摧毁,及对当地现有生物群落的严重破坏甚至摧毁。 通常,金属矿山引起的环境质量退化以及由此导致的生物多样性退化要比非金属矿山更严重;露天开采的矿山引起的景观破坏和生物多样性退化,要比地下开采的矿山更严重。矿山开发的生态环境影响突出表现在以下几下方面: 1土地的占用与破坏 矿山开采后,将会产出大量的废石、排土和尾砂,例如露天开采1吨矿石通常削离5-10 t覆盖的岩土,堆存它们将需占用大量的土地。据报道美国的明尼苏达州北部,由于大型露天磁铁矿近半世纪的大量开采,致使当地土壤质地退化,如不进行有效的治理将有沙漠化的危险(Othman,1996)。矿区的建设也将不可避免地改变地形、自然景观和植被状况等。土地破坏的后果是:水土流失加剧,淤塞污染水体,增加扬尘,严重影响生态环境。另外,尾矿坝、废石堆场设置不当或管理不严,会造成严重的滑坡或泥石流事故,使大面积的土地受到破坏,造成水体污染,危及人身和财产的安全。 2水体污染 矿山开采后的废石堆成尾矿库若不妥善处理,可能会成为地下水污染源。废矿堆、尾矿库长期处在氧化、风蚀、溶滤过程中,其中的有毒矿物成份或有害物质可以随水转入地下、地表水体和农田、土壤之中,造成地下、地表水体受到化学污染。 采矿工业用水远远小于选矿工业的用水量,但不论是采矿还是选矿,若不注意处理其废水,会造成严重的后果。据报道,由于采矿对水体的污染,使美国长达20600km的水域和449个天然和人工湖泊不再适于养鱼(Antonio Simonetti,2000);在国内也不乏其例,如攀枝花选矿厂(曾清如,1997)有部分尾矿废水排入金沙江,对其造成长期的严重污染。又如东鞍山矿(张宝贵,2002)由于外排废水中含有大量的细粒级悬浮物,使杨柳河的河水呈红色,不仅妨碍水生生物的生长,还影响农业灌溉,成为鞍山地区的一大公害。此外开采硫化矿床时,由于伴生的低品位黄铁矿,在自然堆放过程中,经风化、雨水浸蚀可产生有害酸性水。在我国冶金矿山中因酸性水污染造成的危害是十分严重的,如南山铁矿(许步信,1996)的酸性水波及周围1万hm2农田和渔业生产,多年来共赔偿农业损失费累计约百万元。此外,各金属矿山的外排水中浮悬药剂的污染、硝基苯的污染以及其它重金属的污染也屡见不鲜(Sastre,2002)。 井巷开掘、矿床排水疏干所形成的降压漏斗的水力影响半径有时可达数十公里,可能造成区域性水文环境的破坏,使农牧业缺水受损。另外,疏干碳酸盐围岩含水层之后,其岩溶和溶洞会成为地面塌陷下沉,地面设施被破坏的隐患;而当塌陷区或井巷地表贮水体存在水力的沟通时,则会酿成淹没矿井的重大事故;当岩层疏干影响的设计计划不周时,还可导致露天边坡、台阶的滑动和变形,从而出现相应的灾害后果(李小玉,2004) 3大气污染 在矿山生产中,氧化、风蚀作用可使废石堆场、尾矿库形成一个周期性的尘暴源。此外矿石破碎、筛分和选矿等工序也是主要尘源。矿山对大气的污染还包括公路运输过程中形成的大量扬尘。粉尘污染是冶金矿山生产过程中的一种主要污染类型。在我国,由于矿山粉尘污染而使矿区农牧业受害的情况较多。矿山开发引起的环境生态问题是全球性的问题,越来越受到科学界的关注,己成为环境地球化学研究的一个重要领域。随着对矿产资源需求的不断扩大,矿山废物的排放量大幅度增加,环境生态的恢复难度也在不断增大,因此,在科学界关注的同时,政府也要采取一定的措施来给予支持和提供方便(王文,2003)。 1.2矿区重金属污染研究 1.2.1重金属概念及环境化学行为 通常把密度大于5的金属称为重金属,如隔、铬、铜、镍、铅、锌等,砷虽然不属于金属,但由于对环境的影响与重金属类似,通常也称其为重金属。矿产开采过程中所引起的环境问题较多,特别是土壤的重金属污染(Ahmed,1998)。有害重金属通过各种途径进入土壤,不易随水淋溶,微生物难以降解,植物对其有明显的生物富集作用,影响农作物的品质和产量。土壤污染有较长的潜伏期,具有隐蔽性、不可逆性、普遍性、表聚性等特征(Isabelle,2001) 重金属是一类典型的环境污染物,在自然条件下,除了局部范围重金属含量较高之外,一般土壤中有害重金属含量都小于构成污染的临界值。由于受人类生产活动的影响,例如,农业增产措施如农药、化肥的不断使用,加之工业废水、废气、城市生活垃圾、污水及污泥与畜禽粪便等排入环境,都不断污染土壤,使重金属等在环境中的积累不断积聚。特别是最近几十年来,由于土壤环境中污染物含量不断提高,重金属污染问题已经引起学术界、政府和公众的广泛关注。 1.2.2环境中重金属的来源 重金属可以通过废水、废渣的排放,空气悬浮物的携带与运输,水体中的细微尾矿砂颗粒物的运移,食物链的传递等不同途径来引起环境的污染。污染源有以下几个方面: 工业污染源,尤其是基础工业,特别是采矿和冶炼业是向环境中释放重金属的主要污染源。如20世纪60年代,在日本的富山县神通川流域,由于铅锌冶炼厂排放的含锅废水污染水稻田,居民长期食用含偏稻米和饮用含锅水而造成锅中毒,锅进入人体后破坏人体的骨骼系统,使骨质变脆易折,也就是所谓的“骨痛病(Lorenzo,2000)。 生活污染源,主要是生活垃圾,其中含有的重金属能渗到土壤中,影响到地表水和地下水的质量,生活废水中的有机物可以吸收重金属,用这些水灌溉也可导致土壤污染。 农业污染源,主要来自厩肥、污泥、化肥、农药等,有害成分为其释放的重金属,污染物质主要集中于表层或耕层,它的分布比较广泛。污染物的种类和污染的轻重程度与土地的利用方式和耕作制度有关。 交通污染源,主要为含铅汽油的使用,使机动车排放的尾气污染大气。 自然污染源,土壤母质中的重金属本身含量高,还有火山喷发造成的土壤污染。 就矿区来说,以工业污染源为主,其它次之。 1.2.3环境中重金属的危害 尾矿、矿渣是采矿区土壤重金属的主要来源之一。当这些矿山固体垃圾从地下搬运到地表后,由于所处环境的改变,在自然条件下,极易发生风化作用(物理、化学和生物作用),使大量有毒有害的重金属元素释放出来进入到土壤和水体中,给采矿区及周围环境带来严重的污染。 在雨水等的作用下,地下水和地表水都会受到不同程度的重金属污染。目前世界上受高砷饮水危害的国家和地区包括孟加拉国、印度恒河流域、阿根廷、智利、墨西哥、泰国、美国和中国的台湾、内蒙、山西部分地区。孟加拉国受砷危害人口有35-77百万人,占该国总人口(125百万)的一大半,几十年来联合国投入了大量财力物力进行治理,但收效甚微(Kovalchuk,1996)。有300多年开采历史的我国湖南石门雄黄矿,发生了严重的砷污染,河水砷含量达0.5-14.5 mg•L-1,居民头发砷含量为0.972-2.459ug•L-1。以河水为饮用水源的居民的砷暴露水平达到甚至超过国内外重大慢性砷中毒案例的暴露水平。 有毒气体的排放无疑会直接污染大气。如1996年玻利维亚波托西的波尔科矿山的一座铅锌尾矿坝倒塌,致使大约235,000 t有毒尾矿泥浆(包括砷、氰化物、铅和锌等有害成分)排入皮科马约河的一条支流阿瓜卡斯蒂利亚河中,导致饮用该河水和食用该河水中鱼的3名儿童死亡,其毒性影响到800km的巴拉圭一阿根廷的查科(salomons,1995)。另外,巴西亚马逊河流域附近,约17000km,的大范围金矿开采过程中,汞作为重要提金试剂,易形成合金金齐汞,直接释放进入大气,且向大气的释放量远比向河流和土壤的释放量高,占总释放量的65%-83%( salomons,1995),对人体危害十分严重。西班牙某重金属冶炼厂尾砂坝的倒塌,使得随后的土地开发过程中大气可吸入颗粒中铜和锰的含量增加了17~36%和59一70%(Querol,2000)。 重金属在土壤中的聚集引起的危害更为严重。其进入土壤后,一方面可在植物体中累积,并通过食物链最终转移到人体内,危害人群健康,致畸致癌;另一方面,还可能导致地下水污染,超过一定限度就会危害生态系统,如上述所说的水体和大气的污染。由于重金属污染的范围广,持续时间长,又不易在生物物质循环和能量交换中分解,所以污染土壤的修复与治理迫在眉睫,也是科学界比较关注的问题之一。就世界范围来看,全世界每年平均排放汞115万t,锰1500万t,铜340万t,铅500万t,镍100万(Jane vacalet,1999)。据估计,我国仅重金属污染的耕地面积就达2000万ha,约占耕地总面积的115 ,每年因土壤污染而减产粮食1000万t;另外还有1200万t粮食重金属超标,二者的直接经济损失达200多亿元(陈同斌,1999)。在金属成矿区周围的自然扩散区域内,环境中一般含有较高浓度的重金属,加上开矿过程中的废矿水和尾矿砂,常造成严重的重金属污染问题。据报道,湖南省郴县东坡铅锌矿自然扩散晕区域内的环境污染是以铅、锌、镉、砷为主的多金属污染复合体,水体内的细微尾矿砂颗粒物是重金属的主要迁移载体,且该区域内作物中的铅、镉残留很高(曾清如,1994)。 土壤中重金属的超标同时也会使农作物和其它生物受到危害。杨居荣(1992)发现耐福的甜菜与胡萝卜在对营养元素的吸收上呈现两种不同的特征,即耐镐的甜菜往往对钙、镁、锌、铁元素的吸收量大,而胡萝卜则相反。土壤中锌/锅比例增大可显著地降低菠菜含镉量(宋菲,1996)。己有证据表明,铜矿的冶炼可以增加周围农业系统中的铜含量,使冶炼厂周围紫花首稽和柏树叶片中的铜含量明显增加。华南某矿区周围农田土壤中锌含量达690~4000 mg.kg-1;华北某污灌区土壤中锌含量超过1500 mg•kg-1,长期施用污泥的土壤中锌含量达370-470 mg•kg-1,受汞污染的面积达3.2 × 104 ha,每年生产汞米1.95×105吨。沈阳张士灌区和江西大余县等地区的粮食己经遭受严重的锡污染,其含镉量己经超过诱发“痛痛病”的标准。龙育堂等(1994)研究芝麻对稻田汞净化效果,结果表明:土壤含汞量在5-130 mg•kg-1,范围内,汞对芝麻产量和品质仍未造成显著影响;改种芝麻,土壤汞的年净化率高达41%,土壤的自净恢复年限比种植水稻缩短。食物链中重金属的高度富集最终将威胁到人类健康。
Resumo:
Infrared (IR) spectra of normal, hyperplasia, fibroadenoma and carcinoma tissues of human breast obtained from 96 patients have been determined and analyzed statistically. Several spectral differences were detected in the frequency regions of N-H stretching, amide I, II and III bands: (1) the bands in the region 3000-3600cm-1 shifted to lower frequencies for the carcinomatous tissue; (2) the A(3300)/A(3075) absorbance ratio was significantly higher for the fibroadenoma than for the other types of tissues; (3) the frequency of the a-helix amide I band decreased for the malignant tissue, while the corresponding beta -sheet amide I band frequency increased; (4) the A(1657)/A(1635) and A(1553)/A(1540) absorbance ratios were the highest for fibroadenoma and carcinoma tissues; (5) the A(1680)/A(1657) absorbance ratio decreased significantly in the order of normal > hyperplasia > fibroadenoma > carcinoma; (6) the A(1651)/A(1545) absorbance ratio increased slightly for the fibroadenoma and the carcinoma tissues; (7) the bands at 1204 and 1278 cm(-1), assigned to the vibrational modes of the collagen, did not appear in the original spectra as resolved peaks and were distinctly stronger in the deconvoluted spectra of the carcinoma tissue and (8) the A(1657)/A(1204) and A(1657)/A(1278) absorbance ratios, both yielding information on the relative content of collagen, increased in the order of normal < hyperplasia < carcinoma < fibroadenoma. The said differences imply that the information is useful for the diagnosis of breast cancer and malignant breast abnormalities, and may serve as a basis for further studies on conformational changes in tissue proteins during carcinogenesis. (C) 2001 Elsevier Science B.V. All rights reserved.