Pulsed UV Laser Modification of Polyester Textile Materials:Effect on Wettability

There has recently been great interest in ablative photodecomposition(APD), notably in pulsed UV laser treatment on polymers, for modification of physical and chemical properties, such as dyeability, printability, adhesion, Iuster and many more. Very little attention was focused, however, on the property of wetting behaviour,which is one of the most fundamental properties in affecting polymer science. Poly(ethylene terephthalate) (PET) fibers drawn to two different draw ratios and under two temperatures, and three white knitted polyester fabrics made of 100% PET fibre were used to investigate their wetting behaviour due to excimer laser treatment.Experiments like water contact angle measurement, vertical drop test and moisture regain were conducted upon samples and all results give the same conclusion that laser treatment increases the hydrophobicity of all samples tested. Scanning electron microscope (SEM) observation reveals how the morphological modification of polymers by laser treatment is correlate     

丹参水提取物对去卵巢大鼠血脂和肝脏的影响

为研究丹参的雌激素样作用,将32只6月龄SD大鼠随机分成假手术组(Sham)、去卵巢手术组(OVX)、阳性对照17β-雌二醇治疗组(E2,1mg.kg-1.d-1,灌胃)和丹参治疗组(SM,600 mg.kg-1.d-1,灌胃),治疗12周后,检测大鼠体重的增加情况、子宫指数、血脂水平、血清转氨酶活性及抗氧化情况,并进行肝脏的组织学检测.结果显示,丹参水提取物治疗12周能明显抑制去卵巢诱导的大鼠体重的增加,刺激萎缩的子宫生长,改善血脂水平,降低丙氨酸氨基转氨酶(ALT)和天门冬氨酸氨基转氨酶(AST)的活性,减轻肝脏的脂肪变性.丹参水提取物的这些保护作用,可能与其能降低氧化剂丙二醛(MDA)水平,增加超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和谷胱甘肽过氧化物酶(GPx)的活性有关.     

强电场下部分极化反转对铁电复合物ε2的贡献

建立起适合厚片材料测试的非线性介电测试系统和相应的数据处理方法;测得了在不同场强和温度下ＰＺＴ／Ｐ［ＶＤＦ（７７）ＴｒＦＥ（２３）］０３ 型铁电复合物厚片的二阶非线性介电系数;根据Ｙａｍａｄａ 模型拟合（一阶） 介电系数的电场和温度依赖关系得到了退极化场系数Ｌｚ,并由此计算了在各电场和温度下作用于陶瓷粒子的局域场;结果说明在介电系数测试过程中,未预极化复合物试样的二阶非线性介电系数起源于分散相陶瓷粒子在局域场作用下发生的部分极化反转．     

Bioinspired self-repairing slippery surfaces with pressure-stable omniphobicity

Creating a robust synthetic surface that repels various liquids would have broad technological implications for areas ranging from biomedical devices and fuel transport to architecture but has proved extremely challenging. Inspirations from natural nonwetting structures, particularly the leaves of the lotus, have led to the development of liquid-repellent microtextured surfaces that rely on the formation of a stable air-liquid interface. Despite over a decade of intense research, these surfaces are, however, still plagued with problems that restrict their practical applications: limited oleophobicity with high contact angle hysteresis, failure under pressure and upon physical damage, inability to self-heal and high production cost. To address these challenges, here we report a strategy to create self-healing, slippery liquid-infused porous surface(s) (SLIPS) with exceptional liquid- and ice-repellency, pressure stability and enhanced optical transparency. Our approach-inspired by Nepenthes pitcher plants-is conceptually different from the lotus effect, because we use nano/microstructured substrates to lock in place the infused lubricating fluid. We define the requirements for which the lubricant forms a stable, defect-free and inert 'slippery' interface. This surface outperforms its natural counterparts and state-of-the-art synthetic liquid-repellent surfaces in its capability to repel various simple and complex liquids (water, hydrocarbons, crude oil and blood), maintain low contact angle hysteresis (<2.5°), quickly restore liquid-repellency after physical damage (within 0.1-1 s), resist ice adhesion, and function at high pressures (up to about 680 atm). We show that these properties are insensitive to the precise geometry of the underlying substrate, making our approach applicable to various inexpensive, low-surface-energy structured materials (such as porous Teflon membrane). We envision that these slippery surfaces will be useful in fluid handling and transportation, optical sensing, medicine, and as self-cleaning and anti-fouling materials operating in extreme environments.     

基于荧光(或磷光)猝灭的氧传感器的研制(Ⅰ)——指示剂的合成及筛选

金属有机络合物被波长合适的光激发可发射荧光或磷光,这种发射光能被氧气猝灭,现合成了13种金属有机络合物,详尽地研究了它们的光谱特性及氧猝灭特性,总结了关联氧浓度（分压）和发射光强度关系的数学模型,从中筛选了两种灵敏度高、测量范围宽、光学稳定性好的氧感应指示剂,即[Ru(bathophen)3](ClO4)2和Pt（TFPP）,用[Ru(bathophen)3](ClO4)2-Cab-O-Sil-Silicone膜和Pt(TFPP)-Silicone膜进行猝灭实验,证明改进的Stern-Volmer方程计算结果与猝灭数据非常一致,可以作为传感器的标定方程。     

Evolutionary mode of metallothioneins inferred from Cd-MT genes of Tetrahymena

FromTetrahymena thermophila (strain BF5), the coding region ofCd-MT gene was cloned and sequenced, and identified as MTTI isoform. A serial duplicate structure is discovered in its amino acid sequence, which separates the coding region into three parts (Part 1: 7–61: Part 2: 64–118; Part 3: 122–162). The alignments among them and comparison with the corresponding parts of MT1 isoform suggest that MT1 and MTT1 isoforms both come from the same ancient gene that is homologous to Part 1, and Cd-MTs ofTetrahymena are aroused by such ancient gene duplication. The prediction of secondary structures and the analysis of the disulfide-bonding state of cysteine show that there are a lot of differences between MT1 and MTT1 isoforms, which maybe relate to their function mechanism. Foundation item: Supported by KSCX of Chinese Academy of Sciences Grant (SW-102) and the Allocation from the Earmaarked Grant for Hong Kong. Biography: WAN Mingliang (1980-). male, Ph. D. candidate, research direction: molecular ecotoxicology of protozoan.     

Recognition of bacterial glycosphingolipids by natural killer T cells

Natural killer T (NKT) cells constitute a highly conserved T lymphocyte subpopulation that has the potential to regulate many types of immune responses through the rapid secretion of cytokines. NKT cells recognize glycolipids presented by CD1d, a class I-like antigen-presenting molecule. They have an invariant T-cell antigen receptor (TCR) alpha-chain, but whether this invariant TCR recognizes microbial antigens is still controversial. Here we show that most mouse and human NKT cells recognize glycosphingolipids from Sphingomonas, Gram-negative bacteria that do not contain lipopolysaccharide. NKT cells are activated in vivo after exposure to these bacterial antigens or bacteria, and mice that lack NKT cells have a marked defect in the clearance of Sphingomonas from the liver. These data suggest that NKT cells are T lymphocytes that provide an innate-type immune response to certain microorganisms through recognition by their antigen receptor, and that they might be useful in providing protection from bacteria that cannot be detected by pattern recognition receptors such as Toll-like receptor 4.     

Unidirectional rotation in a mechanically interlocked molecular rotor

Molecular motor proteins are ubiquitous in nature and have inspired attempts to create artificial machines that mimic their ability to produce controlled motion on the molecular level. A recent example of an artificial molecular rotor is a molecule undergoing a unidirectional 120 degrees intramolecular rotation around a single bond; another is a molecule capable of repetitive unimolecular rotation driven by multiple and successive isomerization of its central double bond. Here we show that sequential and unidirectional rotation can also be induced in mechanically interlocked assemblies comprised of one or two small rings moving around one larger ring. The small rings in these [2]- and [3]catenanes move in discrete steps between different binding sites located on the larger ring, with the movement driven by light, heat or chemical stimuli that change the relative affinity of the small rings for the different binding sites. We find that the small ring in the [2]catenane moves with high positional integrity but without control over its direction of motion, while the two rings in the [3]catenane mutually block each other's movement to ensure an overall stimuli-induced unidirectional motion around the larger ring.     

An ultrastructural study of the synaptic glomeruli in the intermediolateral nucleus of the rat

Résumé On a constaté que le neuroptile du noyau intermédio-latéral du rat contient de nombreux glomérules synaptiques gliaux encapsulés dans lesquels se trouve habituellement un dentrite ou axe terminal très visible surmonté par de petits boutons et des dentrites. Les glomérules sont accompagnés de synapses axo-axonaux qui peuvent être le corrolaire structural d'une inhibition présynaptique. La signification fonctionnelle des glomérules et des synapses axo-axonaux est discutée.

---

---

It is a pleasure to acknowledge the technical assistance of Mr.H. L. Chan.