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1

Digitale Medien

Enhanced photoemission of Ag–O–Cs composite thin films with an internal electric field (2001)

Zhang, Q. F. ; Liu, W. M. ; Xue, Z. Q. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 89 (2001), S. 2227-2231

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Ag–O–Cs thin films with internal field-assisted structure were fabricated, and enhanced photoemission was observed when the internal electric field was applied to the thin films. The increase of photoelectronic quantum yield, corresponding to the applied 30 V bias, was about 15.7%, while the thin films were irradiated by the light with wavelength of 510 nm. From an analysis of the electric potential distribution in the Ag–O–Cs thin films with the applied internal electric field, it is found that the interfacial barrier between the Ag nanoparticles and the Cs2O matrix is decreased and the vacuum level at the surface is degraded. The calculated barrier curves for various applied biases are illustrated to show the thinning effect of internal electric field on the interfacial barrier width. The theoretical lowering of interfacial barrier height is obtained as 0.08 and 0.22 eV when the thin films are stimulated by applied bias of 1 and 30 V, respectively. Further, a group of formulas as well, based upon the electric potential distribution in the Ag–O–Cs thin films, is deduced to describe the relationship between the applied bias and the degradation of the surface vacuum level. The enhanced photoemission of Ag–O–Cs thin films is attributed to the field-induced variations in the energy band structure which are considered to result in the increased probabilities for the photoexcited electrons to travel through the interfacial barrier and escape into the vacuum. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1334372

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2

Digitale Medien

Ultrafast optical response of the Au–BaO thin film stimulated by femtosecond pulse laser (1998)

Wu, J. L. ; Wang, C. M. ; Zhang, G. M.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 83 (1998), S. 7855-7859

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The pump-probe method was applied to study the dependence of the transient optical transmissivity upon time delay for the Au–BaO composite thin film stimulated by a femtosecond pulsed laser. It was observed that the light absorption of the thin film increased rapidly and then resumed its initial value in several picoseconds. Optical relaxation is a process in which nonequilibrium electrons, excited by laser pulses and originating from Au ultrafine particles, return to the equilibrium state. In this article, the value of the electron-phonon coupling constant g of gold ultrafine particles in the composite thin film was calculated theoretically. © 1998 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.367960

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3

Digitale Medien

Linear instabilities in two-dimensional compressible mixing layers (1989)

Ragab, Saad A. ; Wu, J. L.

New York, NY : American Institute of Physics (AIP)

Physics of Fluids 1 (1989), S. 957-966

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Linear instability waves in supersonic shear layers are analyzed. Both viscous and inviscid disturbances are considered. The basic state is obtained by solving the compressible laminar boundary-layer equations or is specified by the hyperbolic tangent profile. The effects of the velocity ratio and temperature ratio are determined. The numerical results show that the maximum growth rate depends nonlinearly on the velocity ratio. The results also substantiate the convective Mach number as a compressibility parameter for mixing layers.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.857407

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4

Digitale Medien

Monodisperse "rodcoil" copolymers (1993)

Radzilowski, L. H. ; Wu, J. L. ; Stupp, S. I.

s.l. : American Chemical Society

Macromolecules 26 (1993), S. 879-882

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ISSN: 1520-5835

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/ma00056a053

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5

Digitale Medien

Expression of chitin synthase genes during yeast and hyphal growth phases of Candida albicans (1992)

Chen-Wu, J. L. ; Zwicker, J. ; Bowen, A. R. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Molecular microbiology 6 (1992), S. 0

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ISSN: 1365-2958

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie , Medizin

Notizen: Chitin, the β1,4-linked polymer of N-acetylglucosamine, is a fibrous polysaccharide that in many yeasts helps to maintain the structure of the mother-bud junction and in filamentous fungi is often the major supporting component of the cell wall. We have previously described a Candida albicans chitin synthase, CHS1. The DNA and derived protein sequences of a second gene, CHS2, are presented and compared with previously published gene sequences. Northern blot analysis shows that strikingly different levels of synthase 1 and 2 expression occur during yeast and hyphal phases of Candida growth.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2958.1992.tb01494.x

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6

Digitale Medien

Volatile Flavor Compounds from Shallots (1982)

WU, J. L. ; CHOU, C. C. ; CHEN, M. H. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Journal of food science 47 (1982), S. 0

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ISSN: 1750-3841

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Approximately 0.030%, 0.012% and 0.005% (v/w), in wet weight, of volatile oils were obtained from raw, baked and deep-fried shallots, respectively. These oils have been studied by a gas chromatograph coupled to a mass spectrometer. The flavor components of these oils can be classified in the following categories: thiols, monosulfides, disulfides, trisulfides, thiophenes and oxygen compounds. After heating (baking or deep-frying) of the shallot, a sharp increase in the amount of dimethylthiophenes was observed and the alkyl propenyl disulfides decreased.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb10133.x

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7

Digitale Medien

Involvement of serine proteinase in infectious pancreatic necrosis virus capsid protein maturation and NS proteinase cleavage in CHSE-214 cells (1998)

Wu, J-L ; Hong, J-R ; Chang, C-Y ; [weitere]

Oxford, UK : Blackwell Science Ltd

Journal of fish diseases 21 (1998), S. 0

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ISSN: 1365-2761

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie , Medizin

Notizen: An investigation of virus-specific protein maturation in infectious pancreatic necrosis virus (IPNV) infected Chinook salmon embryo cells (CHSE-214) was undertaken. The precursor protein (pVP2–1) of the major mature capsid protein (VP2) was processed sequentially from pVP2–1 to pVP2–2 and VP2. Experiments using serine proteinase inhibitors showed that the maturation of the VP2 was blocked in the pVP2–1 post-translational cleavage steps. A protinin, a potent proteinase inhibitor, at 800 μg ml–1 blocked pVP2–2 to VP2 and the cleavage of VP4 (28 kDa) to VP4–1 (25 kDa). Therefore, our data showed that the maturation of the capsid protein (VP2) and cleavage of VP4 (NS proteinase) can be blocked by serine proteinase inhibitors.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1046/j.1365-2761.1998.00097.x

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8

Digitale Medien

Aquatic birnavirus induces apoptosis through activated caspase-8 and -3 in a zebrafish cell line (2005)

Hong, J-R ; Huang, L-J ; Wu, J-L

Oxford, UK : Blackwell Science Ltd

Journal of fish diseases 28 (2005), S. 0

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ISSN: 1365-2761

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie , Medizin

Notizen: In this study, the possible influence of temperature on infectious pancreatic necrosis virus (IPNV)-induced apoptosis in a zebrafish liver epithelium (ZLE) cell line was investigated. At a lower temperature (18 °C), there was expression of viral proteins VP2 and VP3 at 4 h post-infection (p.i.). At this time no expression was found in the high temperature group at 28 °C. The cell survival ratio was 52 and 18% at 24 and 48 h p.i., respectively, during IPNV infection at 18 °C. In addition, we assayed for apoptosis in IPNV-infected cells with terminal deoxynucleotidyl transferase (TdT)-mediated end labelling (TUNEL) of DNA at different dosages of virus. We found a ratio of apoptotic cells of 8 and 25% at 12 and 18 h p.i., respectively, in the multiplicity of infection (MOI) 1 group. The MOI 10 group had 20 and 45% apoptotic cells at 12 and 18 h, respectively. Furthermore, at 18 °C IPNV activated the caspase-8 and 3 from 1.5 to 2 times at 12 and 18 h p.i., respectively. Taken together, these findings suggest that successful virus replication occurs at the low temperature (18 °C) compared with the non-permissive temperature of 28 °C. Thus, IPNV replication is capable of activating caspase-8 and -3 and inducing host apoptosis.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2761.2004.00604.x

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9

Digitale Medien

Induction of apoptosis and secondary necrosis by infectious pancreatic necrosis virus in fish embryonic cells (1998)

Hong, J-R ; Lin, T-L ; Hsu, Y-L ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Journal of fish diseases 21 (1998), S. 0

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ISSN: 1365-2761

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie , Medizin

Notizen: Infectious pancreatic necrosis virus (IPNV) causes an acute, contagious disease in a number of economically important fish species (Pilcher & Fryer 1980). It is a member of the Birnaviridae (Brown 1986). In this study, the present authors first characterized the process of fish cell damage caused by IPNV infection in cultured cells, and found that it induced fragmentation of chromosomal DNA into oligonucleosomes and also caused nuclear fragmentation by secondary necrosis.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1046/j.1365-2761.1998.00117.x

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10

Digitale Medien

Apoptosis does not play an important role in the resistance of ‘immune’Penaeus japonicus against white spot syndrome virus (2004)

Wu, J L ; Muroga, K

Oxford, UK : Blackwell Science Ltd

Journal of fish diseases 27 (2004), S. 0

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ISSN: 1365-2761

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie , Medizin

Notizen: We previously demonstrated that kuruma shrimp, Penaeus japonicus, exposed to white spot syndrome virus (WSSV) became resistant (‘immune’ shrimp) to subsequent challenge with the virus. The present study investigated the role of apoptosis in the ‘immune’ shrimp during a secondary challenge with WSSV. When naive kuruma shrimp were intramuscularly injected with WSSV at a high or low dose, apoptosis was often detected by TUNEL assay in the lymphoid organ (LO), mainly in the early stage of the infection. A significantly higher incidence of apoptosis was observed in the LO of the shrimp injected with the high dose of WSSV (cumulative mortality: 100%) than in the shrimp injected with the low dose (cumulative mortality: 0%). When ‘immune’ and naive shrimp were injected with an equal dose of WSSV, the incidence of apoptosis was significantly lower in the ‘immune’ shrimp than in the naive shrimp. This difference is assumed to result from a substantial reduction of the virus by humoral neutralizing factor in the ‘immune’ shrimp. These results suggest that apoptosis is not a principal protective factor in ‘immune’ shrimp.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1046/j.1365-2761.2003.00491.x

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