1,203 research outputs found
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
A Report on Mexican Multidimensional Poverty Measurement
No full textThis report addresses the challenges arising from a change in Mexico’s official poverty methodology from an income-only basis to a multidimensional basis that includes education, access to health services, access to social security, shelter characteristics, access to basic services, access to food, and level of social cohesion. The concept of poverty underlying this report is drawn from Amartya Sen’s capability approach. The specific multidimensional measurement framework used is that of Alkire and Foster (2007). Special emphasis is placed on the measure’s population decomposability and dimensional decomposability. The new identification and aggregation methods are then applied to 2005 data provided by CONEVAL to illustrate the feasibility of the methodology and the kinds of results that one might obtain.
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
An Auto-Zero Stabilized Voltage Buffer with a Trimmed Input Current of 0.2pA
No full textThis paper presents an input-current trimming scheme for auto-zero amplifiers. Since their input current is mainly due to charge injection,the scheme operates by trimming the clock swing,and hence the charge injection,of two dummy input switches. At room temperature,the trimming scheme reduces the maximum input current of an auto-zero stabilized voltage buffer from 1pA to 0.2pA (13 samples) over its full input voltage range (0 to 1.3V). This increases to 0.4pA over temperature (0 to 85°C),which is well below the leakage of typical ESD diodes,and is the lowest input current ever reported for an auto-zero amplifier.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
An Auto-Zero-Stabilized Voltage Buffer With a Quiet Chopping Scheme and Constant Sub-pA Input Current
No full textThis article describes an auto-zero stabilized voltage buffer that achieves low offset and low noise with sub-pA input current. A high gain stabilization loop is used to periodically cancel the buffer’s offset. The loop itself is periodically disconnected from the buffer and auto-zeroed, during which its bandwidth is reduced to reduce the associated noise folding. However, this also reduces its offset correction range, and so to avoid overloading, its initial offset is digitally trimmed. To break up the correlation between the residual low-frequency (LF) noise of the auto-zero and stabilization phases, the loop is periodically chopped, which significantly reduces the buffer’s LF noise. Finally, the duty-cycle of the two phases is optimized to bring the buffer’s LF noise density close to 2–√ times its white noise density (14 nV/ Hz−−−√ ), which is the fundamental limit of an AZ amplifier. The buffer also achieves a constant and low input current (0.8 pA), as well as a state-of-the-art offset (0.4 μV ).Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
A Quiet Digitally Assisted Auto-Zero-Stabilized Voltage Buffer with 0.6pA Input Current and 0.6μV Offset
No full textThe readout of high impedance sensors and sampled voltage references [1]requires amplifiers with both low offset and low input current. Chopper amplifierscan achieve low offset, but the switching of their input chopper gives rise tosignificant input current (40 to 110pA) [2-4]. Auto-zero (AZ) amplifiers requireless input switching, but exhibit more voltage noise. However, ping-pongamplifiers continuously swap two auto-zeroed input stages, leading to moreswitching [5,7]. In this work, an AZ stabilized topology is proposed, in which asingle amplifier is always present in the signal path. Only one input switch isrequired, resulting in an input current of 0.6pA (max), a 66× improvement on thestate-of-the art [4]. Furthermore, a digitally assisted offset-reduction schemereduces its low-frequency (LF) noise to the theoretical √5× limit. It also achievesa state-of-the-art maximum offset of 0.6μV.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
The relationship between sedimentary history and geotechnical behaviour of Quaternary sediments in Holderness
No full textIncl. 2 reprints at backAvailable from British Library Document Supply Centre- DSC:DX71258/87 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
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