高离化态Cu的光谱分析

利用束箔光谱技术研究HI—13串列加速器提供的能量为80MeV和110MeV的Cu束与靶室中的碳膜碰撞激发光谱的情况。     

苏芸金芽孢杆菌与蜡状芽孢杆菌基因组DNA同源性及多态性的研究

用ＲＡＰＤ－ＰＣＲ扩增到６１个标准株、生产用菌株及２４个蜡状芽孢杆菌参比菌株的全ＤＮＡ指纹图,通过计算多态性扩增片段的大小,利用ＮＴＳＹＳ软件进行聚类分析,蜡状芽孢杆菌菌株并未形成独立于苏芸金芽孢杆菌的聚群,这是此近缘种ＤＮＡ分子水平高度同源的新证据．６１个苏芸金芽孢杆菌的聚类结果表明：其ＤＮＡ指纹图与Ｈ－血清型有一定相关性．与引物０９５５－０３相比,引物０９４０－１２对苏芸金芽孢杆菌不同亚种及蜡状芽孢杆菌菌株具有更高的鉴别价值,大多数特异株ＤＮＡ全指纹图有菌株特异性,证实ＲＡＰＤ－ＰＣＲ技术是苏芸金芽孢杆菌及蜡状芽孢杆菌种下分类和鉴定的简便快速有效的方法     

高粱“四,四,三”高产高效栽培技术

针对我省高粱高产高效栽培中存在的主要问题,结合近几年来高粱栽培研究的新成果, 通过实践,探索出了“四、四、三”高粱高产高效综合配套栽培技术。该技术操作简便,省工实用,成本低, 效益高。文章对主要技术措施及原理进行了阐述。     

应用前哨淋巴结活检术指导乳癌手术方式的临床研究

目的探讨开展乳腺癌前哨淋巴结活检(sentinel lymph node biopsy,SLNB)的必要性、可行性、准确性及临床应用价值.方法应用美蓝5 mL于原发肿瘤上、下、左、右选4点行皮下及乳腺组织注射,5～15 min后仔细解剖,根据蓝染标记切除SLN.所有患者行同期根治术,切除SLN与区域清扫标本同时送病理检查,了解其符合率,并评价SLNB的可行性.结果 30例均进行SLN识别定位,活检后经病理检查有2例错误.1例未取到SLN,故SLN的检出率为96.7%;1例SLN病理呈假阴性.按目前国外SLNB的评价标准,本组SLNB的敏感度为88.9%,准确率为93.3%,假阳性率为0,假阴性率为11.1%.结论乳腺癌SLNB目前在国内外仍处于研究阶段,随着研究的扩大与深入将可能取代常规的ALND.     

Nurse plant theory and its application in ecological restoration in lower subtropics of China

urse plants are those that facilitate the growth and development of other plant species (target species) beneath their canopy because they offer benign microhabitats that are more favorable for seed germination and/or seedling recruitment than their surrounding environment. Nurse plants have been mainly used to restore vegetation in arid and sub-arid zones in recent years. Based on summarizing the definition of nurse plant and target plant, we review the nursing effect mechanisms, ecological factors that influence nursing effect, relationships between nurse plant and ecological restoration. This review also brings forward possible pairs of nurse and target species at lower subtropical areas. Furthermore, we provide the potential tendency in nurse plant research and application.     

冬麦区晚茬麦适宜品种类型的研究

通过不同类型小麦的播期试验和对冀、鲁、豫、皖、苏调查表明:“黄淮冬麦区”的晚茬麦在冬季极端最低气温不低于-13.2℃,冬前0℃以上积温在400℃以下种植偏春性类型品种,一般比种植冬性类型品种增产7.6—13.1％,最高可增产29.4％。种植冬性早熟类型品种可提前3—5天成熟,为秋粮早播、丰产奠定了基础。     

原位合成TiB/Ti复合材料的微观结构及力学性能

利用钛与硼之间的自蔓延高温合成反应经普通的熔铸工艺原位合成制备了TiB增强的钛基复合材料.通过XRD、SEM、TEM和HREM等分析方法测试了合成材料的物相及微观结构.结果表明原位合成的增强体为TiB,合金化元素铝的加入并不导致新相形成,增强体均匀地分布在基体合金上.由于TiB的B27结构导致TiB易于沿[010]方向生长而长成短纤维状.增强体与基体合金界面非常洁净,没有任何界面反应.由于原位合成增强体的加入,复合材料的力学性能与基体合金比较有了明显的提高.     

Design of an air-slot mode-gap nanocavity in a two dimensional photonic crystal slab

We present a novel and simple design of an air-slot mode-gap photonic crystal(PC) nanocavity by introducing a linear air slot to the center of a line-defect waveguide in a two dimensional triangular-lattice silicon PC slab.A high quality factor(Q factor) of 8.42*105 and an ultrasmall mode volume of 0.998 cubic wavelength are achieved in an optimized air-slot nanocavity which is a suitable choice for the strong matter-field interaction in free space.The high Q cavities with ultrasmall mode volume are important for applications such as quantum computation and nonlinear optics.     

MNi4.8Sn0.2（M=La, Nd）-supported multi-walled carbon nanotube composites as hydrogen storage materials

Two composites LaNi4.8Sn0.2/CNTs and NdNi4.8Sn0.2/CNTs were prepared by an impregnation-reduction method. Their hydrogen storage capacity could reach up to 2.96 wt% and 2.88 wt% respectively at room temperature and 1.0 MPa pressure. These values, which might result from the synergetic effect between the alloy nanoparticles and the pretreated CNTs, were three times higher than those of the unsupported MNi4.8Sn0.2 (M=La, Nd) alloys under the same conditions. XRD and TEM revealed that the alloy particles were uniformly dispersed on the CNTs and the average particle size was ca. 30 nm. The composites also showed good stability and the hydrogen storage capacity decreased by less than 6% after 100 adsorption-desorption cycles. Moreover, no noticeable change in crystalline structure was observed for the composites.     

PTC124 targets genetic disorders caused by nonsense mutations

Nonsense mutations promote premature translational termination and cause anywhere from 5-70% of the individual cases of most inherited diseases. Studies on nonsense-mediated cystic fibrosis have indicated that boosting specific protein synthesis from <1% to as little as 5% of normal levels may greatly reduce the severity or eliminate the principal manifestations of disease. To address the need for a drug capable of suppressing premature termination, we identified PTC124-a new chemical entity that selectively induces ribosomal readthrough of premature but not normal termination codons. PTC124 activity, optimized using nonsense-containing reporters, promoted dystrophin production in primary muscle cells from humans and mdx mice expressing dystrophin nonsense alleles, and rescued striated muscle function in mdx mice within 2-8 weeks of drug exposure. PTC124 was well tolerated in animals at plasma exposures substantially in excess of those required for nonsense suppression. The selectivity of PTC124 for premature termination codons, its well characterized activity profile, oral bioavailability and pharmacological properties indicate that this drug may have broad clinical potential for the treatment of a large group of genetic disorders with limited or no therapeutic options.