PrCl_3对油松种子萌发及幼苗生长的生理生化效应

用不同浓度的ＰｒＣｌ３浸种油松种子，对油松种子萌发及幼苗生长细胞内代射有明显影响。种子发芽率提高，发芽速度加快，幼苗根系加株高增加，单株增重，根系脱氢酶活性提高，幼苗ＳＯＤ活性及光合色素含量高于对照。ｃｈｌａ／ｂ值相对降低。几种处理浓度中０．５～１．０ｍｍｏｌ／Ｌ较好。     

氯化胆碱浸种对菠菜种子萌发·幼苗某些生理特性的影响

[目的]用不同浓度的氯化胆碱(CC)溶液浸种后, 研究CC对菠菜种子萌发及幼苗某些生理特性的影响.[方法]测定了种子萌发率、发芽指数、蛋白质、叶绿素和可溶性糖含量、抗氧化酶活性、丙二醛含量和超氧阴离子的产生速率.[结果]CC溶液浸种后能提高种子萌发率和发芽指数,提高幼苗叶片中可溶性糖、可溶性蛋白质和叶绿素含量,超氧化物歧化酶、过氧化氢酶和过氧化物酶的活性均有所提高, 而超氧阴离子的产生速率和丙二醛含量明显低于未经CC处理的.[结论]各浓度的CC溶液浸种以25 mg/L浸种效果最好.     

盐胁迫下稀土浸种对薏苡幼苗膜脂过氧化作用影响的研究

研究了薏苡种子用２００、４００ｐｐｍ稀土溶液浸种后，其幼苗在ＮａＣｌ胁迫下体内ＳＯＤ活性、膜脂过氧化作用、膜系统伤害三者之间的关系。结果表明：经２００ｐｐｍ稀土溶液浸种后，幼苗在ＮａＣｌ胁迫下，能够维持较高ＳＯＤ活性，降低膜脂过氧化作用和细胞膜透性。说明经合适的稀土溶液浸种，能够提高薏苡幼苗的耐盐性。     

LaCl_3水培对烟草生长的影响

本文利用水培法进行ＬａＣｌ３对烟草幼苗生长作用效果的研究。试验结果表明，适宜质量浓度的ＬａＣｌ３溶液（５～５０ｍｇ／Ｌ）能够促进烟草幼苗的生长，增加株高，扩大叶片面积，根系发达，有利于干物质积累。同时ＬａＣｌ３还能提高叶绿素的含量，改变光合色素比例，降低过氧化物酶及吲哚乙酸氧化酶活性。高质量浓度ＬａＣｌ３（１００ｍｇ／Ｌ）溶液则抑制烟草植株的生长。     

硝酸铈对水稻种子活力和萌发期间酶活性的影响

用２．５～３０ｍｇ／ＬＣｅ（ＮＯ３）３浸泡水稻种子能明显提高稻种的活力，促进幼苗的生长。这与Ｃｅ提高稻种萌发期间的呼吸速率、增加淀粉酶、蛋白酶和脂肪酶等水解酶的活性有密切关系。其中用１０ｍｇ／Ｌ浓度的Ｃｅ（ＮＯ３）３浸种效果最好。当浓度超过５０ｍｇ／Ｌ时，种子的萌发、呼吸作用及三种酶的活性均受到抑制。     

低脆性FeCrAlY电热合金的研制

Ｆｅ－１５Ｃｒ－４Ａｌ－Ｙ合金克服了ＦｅＣｒＡｌ合金的高温脆化和４７５℃脆性，热强性和冷加工性也明显改善，ＦｅＣｒＡｌ使用温度高，抗氧化性好等优点则得到保留。还研制了使用温度更高的Ｆｅ－２０Ｃｒ－４Ａｌ－Ｙ和Ｆｅ－２５Ｃｒ－４Ａｌ－Ｙ合金，形成了低脆性合金系列。加入强化元素能进一步提高合金的热强性，用轻稀土元素代替Ｙ则能降低生产成本。合金生产中的工艺困难已经解决，现已投入批量生产。合金用于电热、电阻元件，耐热结构件和耐高温涂层。用它代替Ｎｉ—Ｃｒ系合金可降低元件成本，提高其使用温度和服役寿命。     

饱和氯化镁卤水中锂与金属络合阴离子共萃取效应的研究

研究了在饱和氯化镁盐湖卤水中，锂与各种络合阴离子的共萃取效应，结果表明，以ＦｅＣｌ３最佳。对锂与铁络合阴离子共萃取相关因素──总Ｃｌ－浓度、酸度、Ｆｅ／Ｌｉ进行了讨论，保持原始水相ＦｅＣｌ３不致水解的最低酸度和高Ｃｌ－浓度，ＦｅＣｌ３与Ｃｌ－形成铁络阴离子，与Ｌｉ＋以ＬｉＦｅＣｌ４络合物形式共萃取进入有机相。化学法分析平衡有机相组成表明，所有阳离子摩尔浓度的总值与Ｆｅ３＋摩尔浓度相等，而Ｃｌ－摩尔浓度与Ｆｅ３＋摩尔浓度比值为４，证明了以络酸ＨｆｅＣｌ４和络酸盐Ｍｅ（ＦｅＣ１４）ｎ（ｎ为金属阳离子价数）的共萃取机理。     

碳对铁及其合金超细微粒氧化特征的影响

采用ＣＯ２激光诱导Ｆｅ（ＣＯ）５－Ｃ２Ｈ４－ＮＨ３的气相分解反应制备了Ｆｅ、Ｆｅ－Ｎ和Ｆｅ－Ｃ－Ｎ超细微粒（微粒直径小于１００ｎｍ）,用透射电子显微镜、Ｘ光衍射、Ｏ／Ｎ和Ｃ／Ｓ测试仪及振动样品磁强计等研究了微粒的结构、表面形态、表面氧的状态及磁性能等;探讨了碳对微粒的氧化特征,特别是对微粒表面氧的形态及其磁性能的影响。结果表明,微粒表面氧的状态可分为吸附态和化合态,并且二者的含量随着微粒的种类不同而变化,碳对微粒表面氧的存在状态、微粒的氧化状况及磁性能具有决定性的影响     

无公害炼铜新工艺研究Ⅱ：N530萃取分离铜及铜的电积

铜精矿用ＦｅＣｌ３浸出后含铜浸出液，用３０％Ｎ５３０萃取铜，ｐＨ１／２为０．５左右，βＣｕ／Ｆｅ分离系数达７３以上，获得的高纯ＣｕＳＯ４溶液，经传统电积工艺，可获得１级电铜。在整个浸出、萃取、电积和ＦｅＣｌ３再生过程中，无任何污染物产生，是一个生态环境效益极好的湿法炼铜新工艺。     

LaCl_3对油松种子萌发过程酯酶同工酶谱的影响

ＬａＣｌ_３对油松种子萌发过程酯酶同工酶谱的影响潘登魁，郭春绒（山西农业大学太谷０３０８０１）稀土化合物在农作物、林业应用机理研究方面已有不少报道［１～７］。稀土元素作为无机金属离子，对植物的某些生理作用，预示着稀土元素可能通过调节酶活性起作用。本文?..     

Update: clinically significant cytochrome P-450 drug interactions

Recent technologies have resulted in an explosion of information concerning the cytochrome P-450 isoenzymes and increased awareness of life-threatening interactions with such commonly prescribed drugs as cisapride and some antihistamines. Knowledge of the substrates, inhibitors, and inducers of these enzymes assists in predicting clinically significant drug interactions. In addition to inhibition and induction, microsomal drug metabolism is affected by genetic polymorphisms, age, nutrition, hepatic disease, and endogenous chemicals. Of the more than 30 human isoenzymes identified to date, the major ones responsible for drug metabolism include CYP3A4, CYP2D6, CYP1A2, and the CYP2C subfamily.     

Corrosion Inhibition Mechanism of Rare Earth Metal on LC4 Al Alloy with Spilt Cell Technique

Inmid1980s,Hintonetal[1～6]foundthata smallamountofCeCl3canobviouslyreducethecorro sionrateof7075aluminumalloyinNaClsolutionand cerium(Ⅲ)saltisregardedastheidealsubstituteof chromates(Ⅵ).Ceriumsalt,asanenvironment fa voredinhibitorofaluminumalloy,hasgainedmore andmoreattention.However,itsinhibitionmecha nismisstillunknown.Basedonthecathodiccoating theory,Hintonetalputforwardrestrictioncathodic reactiontheory[7]thatrareearthcanimprovethecorro sionresistingpropertyofaluminumalloys.Atpresent…     

Isoenzymes of creatine kinase in the perinatal period (author's transl)

The serum of new-born children shows a higher catalytic concentration of creatine kinase than adult serum. These values reach normal adult levels within the first 10 days of life. In addition to the MM-, the MB- and BB-isoenzymes of creatine kinase are also found in the serum of women in labour, in cord-serum, and in the serum of newborn children. These findings should be taken into consideration in the analysis of creatine kinase isoenzymes.     

Effect of Cerium on Seed Germination under Acid Rain Stress

Ｐｌａｎｔｓｈａｒｍｅｄｂｙｔｈｅａｃｉｄｉｃｒａｉｎｉｎｔｅｒｒｅｓ ｔｒｉａｌｅｃｏｓｙｓｔｅｍｓｈａｓｂｅｅｎｒｅｐｏｒｔｅｄｉｎｍａｎｙｃａｓｅｓ[1～ 4] .Ｍａｃｒｏｓｃｏｐｉｃａｎａｌｙｓｉｓｓｈｏｗｓｔｈａｔａｃｉｄｒａｉｎｈａｒｍｓｐｌａｎｔｓｔｏｔｈｅｉｒｇｒｏｕｎｄａｎｄｕｎ ｄｅｒｇｒｏｕｎｄｏｒｇａｎｓａｎｄｔｈｅｌａｔｔｅｒｉｓｄｕｅｔｏｔｈｅａｃｉｄｉｆｉｃａｔｉｏｎｏｆｓｏｉｌｅｎｖｉｒｏｎｍｅｎｔ.Ｉｔｆｏｌｌｏｗｓｔｈａｔｔｈｅａｃｉｄｉｆｉｅｄｓｏｉｌａｆｆｅｃｔｓ…     

CeCl3对Zn在NH4Cl溶液中的缓蚀作用

研究了 Zn在含有少量 Ce Cl3的 NH4 Cl溶液中的缓蚀作用。表面分析和 Tafel极化曲线结果表明 :Zn获得缓蚀作用是由于在其表面形成含铈的氢氧化物和 Ce O2 的复合膜。这层膜大大降低了阴极反应速度 ,提高锌电极的极化性 ,达到保护锌的作用。     

Effect of VER I, synthetic derivative of verucarine E, on the growth of transplantable sarcoma 180 in mice

In female rats, the lethality and hepatotoxicity of cerous chloride (CeCl3) were significantly altered by pretreatment with steroidal and nonsteroidal compounds (pregnenolone-16alpha-carbonitrile "PCN", dexamethasone, spironolactone, phenobarbital) that stimulate hepatic drug-metabolizine enzyme activity and by estradiol. PCN, estradiol, and dexamethasone considerably decreased hepatic triglycerides, but the latter steroid also greatly sensitized the animals to CeCl3 lethality. Spironolactone and phenobarbital similarly lowered the triglyceride level but not significantly. Light and electron microscopy indicated that the hepatocytic damage elicited by CeCl3 was decreased significantly by PCN, estradiol, and dexamethasone. The steroids may have altered the distribution and binding of the metal to the endoplasmic reticulum (er) thus protecting these membranes against the effect of cerium.     

Isoenzymes of alkaline phosphatase - reference values in young people and effects of protein diet (author's transl)]

In 260 normal students, 20-25 years old, the variation in the activities of serum alkaline phosphatase and its isoenzymes with sex, ABO blood groups, and protein intake were studied. The values are on the whole higher in males than in females. The activity of the intestinal isoenzyme was higher in subjects taking protein-rich diet than in those taking protein poor diet.     

Preparation and properties of Al-Mn alloy coatings in NaCl-KCl-AlCl3-CeCl3 molten salts

Al-Mn alloy coatings were electrodeposited on an iron substrate from AlCl3-NaCl-KCl molten salts with anhydrous MnCl2 enhanced by the addition of CeCl3. The microstructure and properties of the Al-Mn alloy coatings were investigated, and scanning electron microscopy, X-ray diffraction, and polarization curves were used to determine the composition, surface morphology, phase structure, and corrosion resistance of the obtained deposits. The results showed that the surface coatings were smooth, and that the crystallites were dense and uniform when 0.22 wt.% CeCl3 was added to the molten salt. An amorphous mixture of Al and Al6Mn was obtained. CeCl3 enhanced the corrosion resistance and increased the hardness of the single amorphous phase alloys. The pitting potential of the coating was approximately -1.1239 V, and its hardness was 390 kgf/mm2.     

稀土浸种对油菜种子萌发及种苗生长的生物效应

浓度低于（８００μｇ／ｍＬ）稀土可促进油菜种子萌发的启动。使用浓度为１００μｇ／ｍＬ,１２小时计数其发芽率为２５％,对照为１２％。但浓度高于１０００μｇ／ｍＬ时,会明显抑制萌发。处理浓度低于８００μｇ／ｍＬ时,稀土浸种对油菜种苗根系的生长有明显促进作用。表现为根长、根鲜重增加,根系活力和幼根内源激素—ＧＡｓ、ＩＡＡ含量都得到提高。幼苗子叶中叶绿素含量提高。高浓度（＞１０００μｇ／ｍＬ）对幼苗生长会有抑制作用,正常苗的百分比下降。     

Forests without primates: primate/plant codependency

Detailed studies of primates and fruiting trees have illustrated that these groups of organisms are involved in a very complex set of interactions, with primates relying on fruiting trees as important food resources and fruiting trees relying on frugivores for seed dispersal. Human activities that influence either primate seed dispersal or fruit production have the potential of having unanticipated effects on the other interactants. Here we evaluate what is known and what we still need to learn to evaluate the long-term consequences of disrupting the interactions between primates and tropical forest trees. We do this by first assessing the potential importance of primates at dispersing the seeds of tropical forest trees. Second, we consider possible consequences of hunting primates on recruitment in tropical tree communities. Third, we address the converse by considering the impacts of decreasing resource availability for primates through either logging or through the extraction of nontimber forest products. Finally, we provide a case study from Kibale National Park, Uganda, that contrasts seedling recruitment in 20 forest fragments in which primate seed dispersers have been dramatically reduced with seedling recruitment in areas that have an intact frugivore community. In comparison to the intact forest, the fragments had lower seedling density and fewer species of seedlings. Furthermore, a greater proportion of the seedlings were from small-seeded species that might not require primates for their dispersal, since they probably can be dispersed by small birds. All of these considerations suggest that disrupting the complex interactions between primates and fruiting trees can potentially have negative and possibly cascading effects on ecosystem processes.