NOKIA Special Edition

诺基亚7360 CELUX Edition RMB2100 “倾慕”系列的7360亦有特别版问世，由诺基亚与日本东京原宿时尚高端俱乐部CELUX合作推出，拥有“Powder Pink”和“Black Chrome”两种颜色款式。为了体现产品的珍贵和特别，这一特别版7360仅在3月1—18日授权CELUX俱乐部限量发售，销售对象只限于CELUX俱乐部会员．     

Removal of bisphenol A by a nanofiltration membrane in view of drinking water production

The efficiency with which a nanofiltration membrane (Desal 5 DK) removes bisphenol A (BPA) was investigated, together with the mechanisms involved. Whereas high retention (>90%) was obtained at the beginning of the filtration, the observed retention coefficient (R_obs) decreased to around 50% when the membrane became saturated, due to adsorption of BPA onto the membrane structure. The presence of ions (Na⁺, Cl⁻) affects the R_obs, this effect being attributed to a change in BPA hydrodynamic radius. Moreover, in our operating conditions, the presence of natural organic matter (1 mg/L) in the feed solution does not lead to variation in BPA retention at steady state.     

现在开始武装你的笔记本电脑——罗技全新笔记本外设系列产品上市

中国的笔记本电脑市场正在迅速成长,用户对于笔记本外设的需求也将进入同步快速提升的阶段。作为笔记本电脑外设领域的知名品牌,罗技充分考虑了用户在笔记本使用中各个环节的需求,推出一系列全新的笔记本外设产品,包括笔记本电脑专用托架、无线光学鼠标、无线数字小键盘、摄像头以及笔记本电脑用背包等多款新品。现在,赶快开始武装你的笔记本电脑吧!     

Grafts of ovaries in males and females of Pleurodeles waltl (urodele amphibia): evidence of a long-term tolerance of allografts; application following a space biology experiment

Ovary grafts were investigated in the salamander Pleurodeles using juveniles and adults as donors and hosts. Ovaries were provided by standard or histo-compatible strains and by standard females which had been submitted to a space flight. Laparotomy of the hosts was used to control viability of grafts. Entire juvenile ovaries transplanted into castrated juvenile females or males were tolerated and developed. Ovarian parts of adult females, which contained a majority of oogonies, could also be tolerated by juvenile animals. In addition, ovarian parts supported a better recovery and differentiation than parts that mainly included mature oocytes. About 24 months after the ovary grafts, some hosts (genetical females or males and standard or spatialized females) crossed with standard males provided progenies originating from oocytes of the grafted ovaries. The protocols applied offer a new range of potentialities, adapted to various experimental purposes such as life science research in space or sex differentiation studies.     

Dichloroaniline retention by nanofiltration membranes

This study evaluates the performance of two nanofiltration membranes in removing a herbicide: dichloroaniline. The membranes, one polyamide and one cellulose acetate, have a cut-off in the range 150-300 g/mol (manufacturers' data). The experiments were carried out with solutions of dichloroaniline in demineralized water, with concentrations from 1 to 10 ppb. For each membrane, the amount of herbicide retained and adsorbed by the membrane was determined as a function of feed concentration and transmembrane pressure. The two membranes, made of different materials but having the same nominal cut-off, retained dichloroaniline to very different extents and by different mechanisms.     

Mass transfer in a membrane aerated biofilm

We present experimental results of mass transfer of a non reactive tracer gas (neon) measured in aerobic heterotrophic biofilm developed from activated sludge. Biofilms are grown in various hydrodynamic conditions and the effective diffusivity is used to quantify the mass transfer through the biofilm. Beyond some cross-flow conditions, the effective diffusivity through the biofilm seems larger than in the bulk. This can be explained by a dispersion generated by convection inside the biofilm, as supported by an analytical flow model and in accordance to the numerical simulation proposed by Aspa et al. (2011).     

Formation of new plasma membrane during the first cleavage cycle in the egg of Xenopus laevis: an immunocytological study

Polyclonal antibodies (IS1) reacting specifically with plasma membrane proteins of the Xenopus oocyte were used to study the formation of new plasma membrane in cleavage furrows. Membrane precursors were detected in the inner cytoplasm, then under the plasma membrane of the animal hemisphere and finally on the furrow's edges. Cycloheximide and colchicine caused abnormal distribution of stained material. IS1 antibodies conjugated to colloidal gold, were used to examine the local insertion of membrane precursors into the furrow region by electron microscopy. Membrane precursors were only detected in intracytoplasmic vesicles that fused with the plasma membrane at the edges of the furrow walls. Arrays of microtubules may guide membrane precursors to the site of their insertion in the furrow walls.     

Phosphorylation of Histone H2AX in the Mouse Brain from Development to Senescence

Phosphorylation of the histone H2AX (γH2AX form) is an early response to DNA damage and a marker of aging and disease in several cells and tissues outside the nervous system. Little is known about in vivo phosphorylation of H2AX in neurons, although it was suggested that γH2AX is an early marker of neuronal endangerment thus opening the possibility to target it as a neuroprotective strategy. After experimental labeling of DNA-synthesizing cells with 5-bromo-2-deoxyuridine (BrdU), we studied the brain occurrence of γH2AX in developing, postnatal, adult and senescent (2 years) mice by light and electron microscopic immunocytochemistry and Western blotting. Focal and/or diffuse γH2AX immunostaining appears in interkinetic nuclei, mitotic chromosomes, and apoptotic nuclei. Immunoreactivity is mainly associated with neurogenetic areas, i.e., the subventricular zone (SVZ) of telencephalon, the cerebellar cortex, and, albeit to a much lesser extent, the subgranular zone of the hippocampal dentate gyrus. In addition, γH2AX is highly expressed in the adult and senescent cerebral cortex, particularly the piriform cortex. Double labeling experiments demonstrate that γH2AX in neurogenetic brain areas is temporally and functionally related to proliferation and apoptosis of neuronal precursors, i.e., the type C transit amplifying cells (SVZ) and the granule cell precursors (cerebellum). Conversely, γH2AX-immunoreactive cortical neurons incorporating the S phase-label BrdU do not express the proliferation marker phosphorylated histone H3, indicating that these postmitotic cells undergo a significant DNA damage response. Our study paves the way for a better comprehension of the role of H2AX phosphorylation in the normal brain, and offers additional data to design novel strategies for the protection of neuronal precursors and mature neurons in central nervous system (CNS) degenerative diseases.     

迷人背影 索尼爱立信W660i RMB 2600

CeBIT 2007前夜，索尼爱立信为Walkman^TM系列再添一员——W660i，提前为大会助兴。这款火线发布的音乐新机可看作2月份刚刚发布的W610i的3G版本，屏幕重新用回TFT材质，显示面积增大到2．0英寸，当然也新装了一枚用于视频通话的辅助摄像头。可惜主摄像头退步明显，自动对焦不翼而飞．自拍镜和闪光灯也一概去掉，另外，     

指纹加密续篇 CECT S10

新近上市的CECT T100在业界掀起了一阵迅猛的“指纹加密“风,同时CECT很快便补充了第二款指纹加密手机——S10,它与前者一样支持六大指纹功能——指纹加密、指纹隐形、指纹防盗、指纹鼠标、指纹拨号、指纹动作,令人看好的2.4英寸QVGA触摸屏和任天堂游戏模拟器也原封不动地得到保留。不过,S10失去了超长待机能力,因为它将机身压缩到了11mm,使超薄机身无法再容纳大容量电