904 research outputs found
Effects of Molecular Structures on the Properties of Polyimides and Photopatternable Polyimide/Silica for Optical Waveguide Applications
No full textCardiac Parasympathetic Output of Nucleus Ambiguus is not Altered in Spomtaneously Hypertensive Rats
No full textThe distribution and reactivity of cardiac parasympathetic neurons in the ventral medulla of hypertensive rats (spontaneously hypertensive rats [SHR]) and stroke-prone spontaneously hypertensive rats [SHRSP]) were compared with age matched normotensive rats (Wistar and Wistar-Kyoto [WKY]). Rats were anesthetized with alpha-chloralose and urethane. L-glutamate (Glu, 10mM, 11nl) was microinjected into the medulla to map the distribution of the cardioinhibitory neurons in and around the nucleus ambiguus (NA). The distribution pattern of the bradycardiac sites was similar in the four strains of rats. Differences in the maximal bradycardiac responses were not statistically significant either. In conparison, hypertensive rats had significantly larger depressor responses to Glu microinjected into the caudal ventrolateral medulla. Taken together, the result suggest that the ventral medulla of hypertensive ratse has enhanced sympathetic reactivity, whereas the parasympathetic cardioinhibitory mechanisms of the NA of hypertensice rats are not significantly altered. Therefore, the diminished cardiovagal response in the baroreflex of hypertensive eats may be due to an alteration on the input side
Photosensitive polyimide/silica hybrid optical materials: Synthesis properties and patterning
No full textIn conventional ionic salt photosensitive polyimides, large volume shrinkage during imidization would be occurred due to eliminating
pendant photosensitive moieties, such as 2-methyl acrylic acid 2-dimethylamino-ethyl ester (MDAE). In this study, the volume shrinkage
of photosensitive poly(4,40-(hexafluoroisopropylidenediphthalic anhydride)-co-oxydianiline) (6FDA-ODA)/MDAE was largely reduced
by photocrosslinking MDAE with a coupling agent and the silica domain in the hybrid materials. The used coupling agents were
3-methacryloxypropyl trimethoxysilane (MPTMS) or (4-vinylphenethyl)trimethoxysilane (VPTMS). The coupling agent and the silica
domain are designed primarily for reducing the volume shrinkage and enhancing the thermal properties, respectively. The retention of
MDAE in the prepared hybrid films is supported by X-ray photoelectron spectroscopy (XPS) and thickness variation during curing process.
The silica domain in the hybrid materials from TEM analysis was in the range of 10–50 nm, which was formed by the coupling agent and
tetramethoxysilane. The silica domain significantly enhanced the thermal properties of the prepared hybrid films in comparison with parent
fluorinated polyimide, including the glass transition temperature and coefficient of thermal expansion. The prepared hybrid materials also
exhibited reduced refractive index and optical loss by increasing the silica. The SEM diagram suggested the prepared photosensitive hybrid
materials could obtain lithographical patterns with a good resolution. These results indicate that the newly prepared photosensitive
polyimide/silica hybrid materials may have potential applications for optical devices.In conventional ionic salt photosensitive polyimides, large volume shrinkage during imidization would be occurred due to eliminating
pendant photosensitive moieties, such as 2-methyl acrylic acid 2-dimethylamino-ethyl ester (MDAE). In this study, the volume shrinkage
of photosensitive poly(4,40-(hexafluoroisopropylidenediphthalic anhydride)-co-oxydianiline) (6FDA-ODA)/MDAE was largely reduced
by photocrosslinking MDAE with a coupling agent and the silica domain in the hybrid materials. The used coupling agents were
3-methacryloxypropyl trimethoxysilane (MPTMS) or (4-vinylphenethyl)trimethoxysilane (VPTMS). The coupling agent and the silica
domain are designed primarily for reducing the volume shrinkage and enhancing the thermal properties, respectively. The retention of
MDAE in the prepared hybrid films is supported by X-ray photoelectron spectroscopy (XPS) and thickness variation during curing process.
The silica domain in the hybrid materials from TEM analysis was in the range of 10–50 nm, which was formed by the coupling agent and
tetramethoxysilane. The silica domain significantly enhanced the thermal properties of the prepared hybrid films in comparison with parent
fluorinated polyimide, including the glass transition temperature and coefficient of thermal expansion. The prepared hybrid materials also
exhibited reduced refractive index and optical loss by increasing the silica. The SEM diagram suggested the prepared photosensitive hybrid
materials could obtain lithographical patterns with a good resolution. These results indicate that the newly prepared photosensitive
polyimide/silica hybrid materials may have potential applications for optical devices
Differential effects on sympathetic nerve activities elicited by activation of neurons in the pressor areas of dorsal and rostral ventrolateral medulla in cats
No full text
C.T. Vivian, Joseph E. Lowery, and Tom Brown, circa 1980
No full textSouthern Christian Leadership Conference President Joseph E. Lowery is shown standing outside with C.T. Vivian (left) and Tom Brown (right) at Paschal's Motor Hotel.The Atlanta University Center Robert W. Woodruff Library acknowledges the generous support of the Joseph & Evelyn Lowery Institute for Justice and Human Rights, the Joseph Echols Lowery Irrevocable Trust, and other donors in supporting the processing and digitization of Morehouse College's Joseph Echols and Evelyn Gibson Lowery Collection
Fig. 12. Zingiber pleiostachyum K.Schum., Chichidashan. A. Habit. B in Taxonomic revision of Zingiber (Zingiberaceae) of Taiwan
No full textFig. 12. Zingiber pleiostachyum K.Schum., Chichidashan. A. Habit. B. Leaf adaxial (left) and abaxial (right) surface. C. Ligule. D. Rhizome. E. Inflorescence. F. Flower. G. Bracts. H. Calyx tube. I. Corolla lobes. J. Labellum. K. Stamen and pistil. L. Ovary. M. Fruit. N. Seeds. Photos: A = C.T. Chao; B–N = L.P. Hsu.Published as part of Lin, Yuan-Chien, Chao, Chien-Ti, Chang, Chih-Yi & Tseng, Yen-Hsueh, 2022, Taxonomic revision of Zingiber (Zingiberaceae) of Taiwan, pp. 74-102 in European Journal of Taxonomy 839 on page 92, DOI: 10.5852/ejt.2022.839.1933, http://zenodo.org/record/711910
Pectin - Xyloglucan linkages in type I primary cell walls of plants
No full textEvidence for covalent pectin - xyloglucan linkages in the cell wall of growing cells and maturing tissues has been reported. In-vitro studies using isolated Golgi membranes, and pulse-labelling studies in vivo, indicate that pectin - xyloglucan linkages form in the Golgi apparatus. The structure and biological significance of these complexes are discussed. © 2005 Società Botanica Italiana.Abdel-Massih RM, 2003, PLANTA, V216, P502, DOI 10.1007-s00425-002-0861-y; Brett C.T., 1996, PHYSL BIOCH PLANT CE; BRETT CT, 2004, 10 CELL WALL M 2004, P66; Femenia A, 1999, CARBOHYD POLYM, V39, P151, DOI 10.1016-S0144-8617(99)00003-X; KEEGSTRA K, 1973, PLANT PHYSIOL, V51, P188, DOI 10.1104-pp.51.1.188; MCCANN MC, 1990, J CELL SCI, V96, P323; POPPER ZA, 2004, 10 CELL WALL M 2004, P85; Thompson JE, 2000, PLANTA, V211, P275, DOI 10.1007-s004250000287; Vincken JP, 2003, PLANT PHYSIOL, V132, P1781, DOI 10.1104-pp.103.022350; WALDRON KW, 1992, PHYTOCHEMISTRY, V31, P1931, DOI 10.1016-0031-9422(92)80336-D89
Contribuicao para o estudo da epidemiologia molecular e da patogenia das infeccoes causadas por Chlamydia trachomatis
No full textThe study determined Chlamydia trachomatis (C.t.) genotype E as predominant, in the biological products of Lisbon citizens infected by C.t.. The author developed an experimental model of chronic infection, using mice of different haplotypes, inoculated (once or more) in the uterus (through the vagina) with one E C.t. strain. C.t. was isolated, by culture, after the first inoculation, but C.t. DNA was detected during the six months period of experiments; C.t. remained in tubal tissues in a nonviable biological state. The humoral immune response of infected animals indicated a chronic C.t. infection. The evaluation of the genetic expression of different cytokines produced by Th1 or Th2 cells, couldn't determine a profile specifically related with the chronic C.t. infection; however, the IFN_#gamma# production by illiac node cells, only occured during the acute infection. The production of isotype IgG2a or IgG1 showed a Th1 profile in C3H/He mice and a Th2 profile in C57BL/6 mice. C3H/He mice produced antibodies to the C.t HSP60 (CHSP60) during both acute and chronic C.t. infection; C57BL/6 mice only reacted to CHSP60 when submitted to several C.t. infection episodes. Mice carrying a chronic C.t. infection didn't exhibit any histological changes suggesting episodes. Mice carrying a chronic C.t. infection didn't exhibit any histological changes suggesting the establishment of a chronic inflammatory processAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1200 Lisboa / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga
Detection and Interpretation of Communities in Complex Networks: Methods and Practical Application
Full text linkCommunity detection is an important part of network analysis and has become a very popular field of research. This activity resulted in a profusion of community detection algorithms, all different in some not always clearly defined sense. This makes it very difficult to select an appropriate tool when facing the concrete task of having to identify and interpret groups of nodes, relatively to a system of interest. In this article, we tackle this problem in a very practical way, from the user's point of view. We first review community detection algorithms and characterize them in terms of the nature of the communities they detect. We then focus on the methodological tools one can use to analyze the obtained community structure, both in terms of topological features and nodal attributes. To be as concrete as possible, we use a real-world social network to illustrate the application of the presented tools, and give examples of interpretation of their results from a Business Science perspective.Complex Networks, Community detection, Business Science, Community interpretation
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