Infrared study of the hydroxyl bands in clinoamphiboles

Sharp single peaks in the fundamental and first-overtone bands of the O-H stretching vibration in pure Mg(2)+ and Fe(2)+ amphiboles split into a maximum of four sharp peaks, corresponding to hydroxyl groups linked to 3 Fe, 2 Fe + Mg, 2 Mg + Fe, and 3 Mg, in mixed Fe(2)+-Mg(2)+ amphiboles. Within any one solid-solution series, the frequencies of these peaks can be correlated with the electronegativity of ions in the M(l) and M(3) positions, and differences between series can be correlated with the size of ions in the M(4) position. The O-H vector lies approximately normal to z in the (010) plane. The distribution of Fe(2)+ and Mg(2)+ ions between the (M(1),M(3)) and (M(2)M(4)) positions in the cummingtonite-grunerite series, and between the (M(1),M(3)) and M(2) positions in the tremolite-ferroactinolite series, has also been estimated.     

不同栽培基质对香椿网袋容器苗生长的影响

[目的]研究不同栽培基质对香椿网袋容器苗生长的影响。[方法]采用泥炭、蛭石、珍珠岩和松树皮4种栽培基质,共设3次重复,以香椿种子为试材进行播种苗培育。[结果]不同基质培育苗木对香椿网袋容器苗生长指标方差分析影响均显著。M1基质容器苗的苗高、地径、地上干重和地下干重最大,分别为26.96 cm、2.98 mm、0.99 g、0.21 g;M8基质容器苗主根长最大,为9.34 cm;M4基质容器苗一级侧根数最多,为8.30根。不同栽培基质容器苗的质量指标为M1(0.087)>M2(0.079)>M5(0.075)>M4(0.069)>M9(0.062)>M3(0.042)>M8(0.034)>M6(0.029)>M7(0.026)。[结论]M1基质为香椿容器苗最适宜的配比基质,M2基质次之。     

3种幼苗对水淹胁迫的生理响应

以灰木莲Manglietia glauca、木麻黄Casuarina equisetifolia、乐昌含笑Michelia chapensis幼苗为试验材料,人工模拟水淹胁迫环境,研究了水淹胁迫对这3种幼苗叶片5项生理指标的影响.结果表明,随着水淹持续时间的延长,灰木莲的叶片叶绿素含量小幅波动后急剧升降,木麻黄先微降后上升,而乐昌含笑小幅波动,峰值在(1.73±0.02)～(2.37±0.02)mg.g-1之间;灰木莲的可溶性糖含量在水淹初期下降后又回升,木麻黄则不断上升,乐昌含笑先升后降,峰值在(3.21±0.14)%～(4.96±0.34)%之间;灰木莲的蛋白质含量波动大,木麻黄小幅波动后下降,乐昌含笑先升后降,峰值在(17.97±0.83)～(28.10±2.16)mg.g-1之间;灰木莲、乐昌含笑的叶片超氧化物歧化酶(SOD)活性呈逐渐下降的趋势,而木麻黄先升高后下降,峰值在(177.39±4.86)～(183.94±1.71)U.g-1之间;灰木莲和乐昌含笑的丙二醛(MDA)含量均有上升,而木麻黄保持稳定,峰值在(0.018±0.001)～(0.037±0.002)μmol.g-1之间.主成分分析综合评价得出3个树种的抗涝性为:木麻黄>灰木莲>乐昌含笑.     

不同有机无机肥氮投入比例对双季水稻生理特性与产量的影响

为探明不同有机肥氮素占总氮投入的百分比处理对双季稻区早稻和晚稻各个生育时期植株生理特性及产量的影响,以大田定位试验为平台,系统分析了无N对照（M0）、施用化肥N（M1）、30%有机肥N（M2）、50%有机肥N（M3）、100%有机肥N（M4）5个不同施肥处理双季水稻植株叶片保护性酶活性、光合特性及产量的差异。结果表明：早稻和晚稻各个主要生育时期,M1、M2、M3和M4处理均提高了植株叶片超氧化物歧化酶（superoxide dismutase,SOD）、过氧化物酶（peroxidase,POD）和过氧化氢酶（catalase,CAT）活性,降低了丙二醛（malondialdehyde,MDA）和脯氨酸（proline,Pro）含量。其中,M1和M2处理植株叶片SOD、POD和CAT活性均显著高于M0处理,而MDA和Pro含量均显著低于M0处理。早稻和晚稻各个主要生育时期,M1、M2、M3和M4处理植株叶片净光合速率、蒸腾速率和叶片气孔导度均显著高于M0处理。2017和2018年两年的早稻产量均以M1和M2处理最高,分别比M0处理显著增加2 0408和1 9728 kg·hm-2;晚稻产量分别以M1和M4处理最高,分别比M0处理显著增加2 1724和2 0060 kg·hm-2。采取不同有机肥氮素占总氮投入百分比施肥处理均有利于提高双季水稻叶片保护性酶活性和光合特性,为水稻获得高产奠定了生理基础。     

漆树(Toxicodendron vernicifluum)过氧化物酶的研究 Ⅰ.同工酶酶谱 Ⅱ.热和不同试剂对酶活性的影响

聚丙烯酰胺垂直平板凝胶电泳分离了成熟叶片和树皮中离子型结合、共价型结合和游离于细胞壁的过氧化物酶。结果表明这两种器官之间离子型结合于壁和游离于壁的过氧化物酶酶谱(谱带活性和Pf值)差异显著,而共价型结合的仅在谱带活性上差异显著,Pf值则表现一致。10个品种(或类型)漆树个体叶片可溶性过氧化物酶酶谱比较表明该物种从中心分布区到边缘区、从野生类型到栽培品种,均在同工酶酶谱上发生了变异。对于通过叶片可溶性过氧化物酶同工酶检定进行品种或类型的分类和鉴定和以该酶谱为探针追溯某一漆树品种的来源的可能性作了讨论。 热处理表明该酶具有热稳定性。对漆树过氧化物酶粗酶起抑制作用的试剂有巯基乙醇、半胱氨酸、丹宁酸、氟化钠和氰化钾;起激活作用的有桂皮酸、咖啡酸、香豆素和根皮苷。     

Cerebral GM1-gangliosidosis: chemical pathology of visceral organs

The livers and spleens from three patients with cerebral G(M1)-gangliosidosis contained greatly increased concentrations of a mucopolysaccharide tentatively identified as keratan sulfate. The concentration of a very soluble sialomucopolysaccharide was also increased. Concentrations of these compounds were not increased in the viscera of patients with Tay-Sachs disease (G(M2)-gangliosidosis). G(M1)-gangliosidosis appears to be a combined cerebral gangliosidosis and visceral mucopolysaccharidosis.     

Crystal site location of iron and trace elements in a magnesium-iron olivine by a new crystallographic technique

A new crysallographic technique has been developed, which has been applied to the problem of locating the cations in a natural olivine crystal with the composition (Mg(0.90)Fe(0.10)Ni(0.004)Mn(0.002))(2)SiO(4). The method uses the variation of characteristic x-ray emission with the direction of an exciting electron beam in an analytical transmission electron microscope. It may be applied to nanometer-sized areas and to concentrations as low as 0.1 atomic percent, is capable of distinguishing neighbors in the periodic table, and does not require external standards. The iron atoms in this crystal are evenly distributed between the two available crystal sites M1 and M2 (49.6 +/- 1 percent on M1), whereas the trace elements nickel and manganese occupy the M1 and M2 positions, respectively (97 +/- 5 percent nickel on M1 and 1 +/- 5 percent manganese on M1).     

KOI-126: a triply eclipsing hierarchical triple with two low-mass stars

The Kepler spacecraft has been monitoring the light from 150,000 stars in its primary quest to detect transiting exoplanets. Here, we report on the detection of an eclipsing stellar hierarchical triple, identified in the Kepler photometry. KOI-126 [A, (B, C)], is composed of a low-mass binary [masses M(B) = 0.2413 ± 0.0030 solar mass (M(⊙)), M(C) = 0.2127 ± 0.0026 M(⊙); radii R(B) = 0.2543 ± 0.0014 solar radius (R(⊙)), R(C) = 0.2318 ± 0.0013 R(⊙); orbital period P(1) = 1.76713 ± 0.00019 days] on an eccentric orbit about a third star (mass M(A) = 1.347 ± 0.032 M(⊙); radius R(A) = 2.0254 ± 0.0098 R(⊙); period of orbit around the low-mass binary P(2) = 33.9214 ± 0.0013 days; eccentricity of that orbit e(2) = 0.3043 ± 0.0024). The low-mass pair probe the poorly sampled fully convective stellar domain offering a crucial benchmark for theoretical stellar models.     

灵芝菌丝体多糖的提取与抗氧化活性研究

通过DEAE Sephacel柱层析得到灵芝菌丝体多糖M1、M2和M33个组分,其M1组分多糖含量最高(47.19%),其次为M2(31.18%)和M3(11.02%)。体外抗氧化活性试验结果显示:M1对羟基自由基和超氧阴离子自由基的清除能力最强,M2次之,M3最弱。     

山药节间部培养及其增殖的研究

本试验以普通山药(Dioscored batatas Decne)的节间部为外植体,通过筛选附加在NA-AO+Zt10~(-5)M和NAA10~(-6)M+BA10~(-6)M的MS培养基上幼植株形成率高,并且可生产多个嫩茎,其根系发达,分化速度快,繁殖系数大。为了保持山药种的纯度和无病毒株的利用,可用此法进行大量的无性繁殖。     

甘露醇-1-P脱氢酶转基因表达对转基因水稻幼苗抗盐性的影响

现已证实,在转基因烟草中超量合成并积累低分子量化合物,可以增强植物对包括盐渍在内的非生物逆境的抗性。这些低分子量化合物包括甘露醇、脯氨酸、果聚糖、甜菜碱、海藻糖和芒柄醇等。在大肠杆菌中甘露醇－１－Ｐ脱氢酶（ＥＣ１．１．１．１７）,由ｍｔｌＤ基因编码并催化Ｄ－甘露醇的运输和利用〔２〕。然而,在转基因烟草（ＮｉｃｏｔｉａｎａｔａｂａｃｕｍＬ．）〔５〕和拟南芥（ＡｒａｂｉｄｏｐｓｉｓｔｈａｌｉａｎａＬ．）〔６〕中,ｍｔｌＤ转基因表达却导致甘露醇的合成和积累并对ＮａＣｌ处理产生很强的抗性。本研究用ｍｔｌ…     

不同采收期对黔产地稔中多糖含量的影响

为了摸索地稔药材的适宜采收期,采用苯酚-硫酸比色法测定了贵州惠水产地稔中的多糖含量。结果表明,不同采收期地稔中的多糖含量差异较大,其中,5月(开花期)和9月(果熟期)采地稔药材中的多糖含量较高,分别为3.24%和3.10%,1月最低,为1.10%,但由于9月地稔药材的产量较高,因此,以9月作为地稔药材的最佳采收时期。     

鲤春病毒血症病毒基质蛋白基因的原核表达及多克隆抗体的制备

根据鲤春病毒血症病毒(SVCV)基因组序列(GenBank:NC_002803),人工合成M基因开放阅读框序列,克隆至原核表达载体pET-32a(+),转化工程菌株BL21 (DE3),在0.1 mmol·L-1 IPTG、37℃下诱导5h,获得高效表达的M蛋白,但其主要以包涵体的形式存在,经超声破碎、包涵体纯化后,再...     

矮砧对富士苹果生长结实的效应

1977～1986年在丰县大沙河果园对富士苹果作了矮砧比较试验。结果表明:M9中砧生长量最小,树高和干周分别为对照M7/平邑甜茶的76.1％和67.2％,其次为M7自根砧。M4和MM106中砧生长旺。M7自根砧结果早,早期产量高,其次为M9中砧。10年累计株产M9中砧和M7自根砧表现高产,分别为299.15kg/株和280.70kg/株,MM106中砧产量最低,仅12.81kg/株。果实可溶性固形物含量以M7自根砧较高,MM106中砧较低。果实硬度M4中砧较高,M7中砧较低。果实大小各砧木之间差异不显著。     

不同基质对金森女贞容器苗生长的影响

以珍珠岩、锯屑、稻壳、粗河砂和泥炭土为材料,采用单形重心混料试验设计方法设计7种轻型基质配方,以常规基质为对照,研究这7种基质对金森女贞容器苗的株高、地径、叶片数、总叶绿素含量等生长指标的影响。结果表明:不同基质配方对容器苗的生长有显著影响,M5（50％稻壳+ 40％泥炭土+ 5％珍珠岩+ 5％粗河砂）、M6（50％锯屑+ 20％泥炭土+ 20％稻壳+ 5％珍珠岩+5％粗河砂）、M7（50％稻壳+ 20％珍珠岩+ 20％蛭石+ 10％粗河砂）混合基质容器苗的生长优于常规基质容器苗,而M1（稻壳）、M2（泥炭土）、M3（锯屑）和M4（东北草炭）单一基质容器苗的生长则显著差于对照。不同基质中金森女贞容器苗的生长分析表明,M5、M6、M7混合基质有适宜的容重、总孔隙度、最大持水量,化学性质稳定,有机质含量较高,为金森女贞容器育苗的优良轻型培养基质,对金森女贞的容器苗生产具有重要意义。     

双季杂交稻超高产品种搭配模式研究

以双季常规稻搭配(湘早籼45号-湘晚籼12号)为对照,采用田间小区试验方法,对T优705-湘丰优103(M1,早熟早稻-早熟晚稻)、金优974丰源优272(M2,中熟早稻-中熟晚稻)、金优402-T优6135(M3,迟熟早稻-迟熟晚稻)3种双季杂交稻搭配的早、晚稻生长发育和周年产量进行了研究.结果表明,各处理早、晚稻(整个生育期)叶面积指数表现为:M3＞M2＞M1＞CK.早稻分蘖盛期和齐穗期,各处理水稻地下部分干物质积累量表现为M1＞M3＞M2＞CK;灌浆期和成熟期,水稻植株的地上部分干物质积累量顺序为M3＞M2＞M1＞CK;晚稻齐穗期、灌浆期和成熟期,地下部分干物质积累量表现为M3＞M1＞M2＞CK.M1和M2处理早、晚稻生育期适宜,均有利于晚稻的安全齐穗,双季水稻总产量分别为16 189.3、15 494.7 kg/hm2,分别比对照增加25.01％、19.65％.由此可见,早、晚稻选择生育期适中的高产早、中熟品种搭配的栽培模式有利于保证双季水稻周年高产.     

拓扑模的谱

设R是任意带单位元的结合环,M是右R-模,如果Specr(M)是一个Zariski拓扑空间,则称M是拓扑模.研究了模的pm性质和模上的一些拓扑性质.证明了如果M是有限生成的拓扑右R-模,则Specr(M)是正规空间的充分必条件是Maxr(M)是Specr(M)的保核收缩映射且Maxr(M)是Hausdorff空间.     

Earthquake hazards on the cascadia subduction zone

Large subduction earthquakes on the Cascadia subduction zone pose a potential seismic hazard. Very young oceanic lithosphere (10 million years old) is being subducted beneath North America at a rate of approximately 4 centimeters per year. The Cascadia subduction zone shares many characteristics with subduction zones in southern Chile, southwestern Japan, and Colombia, where comparably young oceanic lithosphere is also subducting. Very large subduction earthquakes, ranging in energy magnitude (M(w)) between 8 and 9.5, have occurred along these other subduction zones. If the Cascadia subduction zone is also storing elastic energy, a sequence of several great earthquakes (M(w) 8) or a giant earthquake (M(w) 9) would be necessary to fill this 1200-kilometer gap. The nature of strong ground motions recorded during subduction earthquakes of M(w) less than 8.2 is discussed. Strong ground motions from even larger earthquakes (M(w) up to 9.5) are estimated by simple simulations. If large subduction earthquakes occur in the Pacific Northwest, relatively strong shaking can be expected over a large region. Such earthquakes may also be accompanied by large local tsunamis.     

基于反射光谱全波段与双波段甘蔗叶片叶绿素预测模型比较

以甘蔗品种新台糖22号(ROC22)叶片为研究对象,针对全波段和双敏感波段处的反射率分别建立甘蔗叶片叶绿素含量的预测模型,对比各模型的精度。全波段方面,以可见-近红外光谱反射率为输入量,提取出前5个主成分后,分别采用多元线性回归(MLR)与BP神经网络(BPNN)方法建立全波段模型M1与M2;敏感波段方面,选择731和785nm这2个敏感波段及由二者计算出的植被指数为输入量,建立一元线性回归(SLR)模型M3、MLR模型M4以及BPNN模型M5。研究结果表明:M1与M2的预测值与实测值间的决定系数R~2分别为0.792 4和0.892 9;M3、M4、M5的R~2分别为0.821 2、0.840 1和0.848 2;BPNN模型精度高于线性回归模型;虽M5的精度稍低于M2的精度,但M5只包含2个敏感波段信息,具有更高的工程应用价值。     

从红曲粉中分离筛选高产红色素的菌株

为分离筛选出产红色素能力强的菌株,采用不同培养基,以稀释倒平板法及平板划线法从红曲粉中分离纯化,再以红色素含量为指标,进行摇瓶发酵试验,优选出产红色素的菌株。结果表明:经分离纯化获得3株产红色素霉菌M1、M2和M3;发酵试验表明,M1菌株在黄豆芽汁发酵液和M3菌株在马铃薯发酵液中产红色素能力都较强,经形态学鉴定证实M1和M3菌株是红曲霉菌,且对酸和乙醇有一定的耐受性。