Secondary streaming in a narrow cell caused by a vibrating wall

1995 ◽  
Vol 180 (4) ◽  
pp. 529-537 ◽  
Author(s):  
P. Vainshtein ◽  
M. Fichman ◽  
D. Pnueli
Keyword(s):  
Narrow Cell

scholarly journals PIV with volume lighting in a narrow cell: An efficient method to measure large velocity fields of rapidly varying flows

2011 ◽  
Vol 35 (6) ◽  
pp. 1030-1037 ◽  
Author(s):  
Matthieu Roudet ◽  
Anne-Marie Billet ◽  
Frédéric Risso ◽  
Véronique Roig
Keyword(s):  
Efficient Method ◽  
Velocity Fields ◽  
Large Velocity ◽  
Narrow Cell

Su1391 Open Cell Versus Narrow Cell Uncovered Self-Expanding Metal Stents in the Treatment of Malignant Distal Biliary Obstruction

2013 ◽  
Vol 77 (5) ◽  
pp. AB308
Author(s):  
Sami A. Almaskeen ◽  
Jason Bill ◽  
Vladimir M. Kushnir ◽  
Dayna S. Early ◽  
Riad R. Azar ◽  
...  
Keyword(s):  
Biliary Obstruction ◽  
Metal Stents ◽  
Open Cell ◽  
Self Expanding Metal Stents ◽  
Cell Versus ◽  
Narrow Cell

The ultrastructure of the scolex–neck syncytium, neck cells and frontal gland cells of Caryophyllaeus laticeps (Caryophyllidea: Cestoda)

Parasitology ◽  
1981 ◽  
Vol 83 (3) ◽  
pp. 477-487 ◽  
Author(s):  
K. Sylvia Richards ◽  
C. Arme
Keyword(s):  
Granular Material ◽  
The Body ◽  
Frontal Gland ◽  
Dense Ring ◽  
Gland Cells ◽  
Neck Cell ◽  
Cell Processes ◽  
Lined Ducts ◽  
Electron Lucent ◽  
Narrow Cell

SUMMARYThe syncytium of the scolex and neck regions of Caryophyllaeus laticeps differs from that of the remainder of the body in a number of ways. The microtriches have short shafts and lamellated spines and the surface cytoplasm is characterized by numerous elongated granules, occasional lipid-like bodies and, in the scolex region, is penetrated by ducts from the frontal glands. The elongated granules arise from the tegumentary neck cells and pass into the syncytium via narrow cell processes possessing extensions of the neck cell microtubule system. The granules have a peripheral sub-structure of regularly spaced electron-lucent areas. Evidence suggests that the granular material becomes more diffuse before extrusion. The spherical, lipid-like bodies also arise from the neck cells, but extrusion from the syncytium was not observed. Homology of the neck cells with the tegumentary cells of the rest of the body is discussed. The frontal glands are restricted to the scolex apex and secrete spherical or sub-spherical, homogeneous granules. The cells, with microtubule-lined ducts, open to the surface via pores which possess an electron-dense ring at which point the microtubule system terminates. Sensory bulbs are also present and will be described in a subsequent communication. The inter-relationships of the gland distribution, scolex morphology and host pathology are discussed.

scholarly journals 'Each in his narrow cell for ever laid': Dunedin's Southern Cemetery and its New Zealand Counterparts

2013 ◽  
Vol 20 ◽  
pp. 42-67 ◽  
Author(s):  
Alexander Trapeznik ◽  
Austin Gee
Keyword(s):  
Nineteenth Century ◽  
New Zealand ◽  
Regional Differences ◽  
Historic Conservation ◽  
First Time ◽  
Narrow Cell

This article compares aspects of the design, layout and purpose of a range of historic New Zealand urban cemeteries with the Southern Cemetery in Dunedin. It makes use of recent research conducted for historic conservation reports which has enable detailed comparisons to be made for the first time. The Southern Cemetery survives as a representative example of a modern, urban cemetery of the mid-nineteenth century, though it is unusual in being in a comparatively unaltered state. It is shown that denominational division was a requirement from the outset in most places, contrary to the widespread assumption that it was uncommon. No major regional differences between cemeteries are to be found other than those due to the ethnic and religious pattern of settlement. The topography of cemeteries is also considered, together with their siting, plantings, specialised structures, maintenance, and their vulnerability to vandalism, ‘improvement’ or destruction.

Investigation for Narrow Cell Threshold Voltage Distribution in NOR Flash Device

2007 ◽  
Vol 46 (8A) ◽  
pp. 5067-5070 ◽  
Author(s):  
Yun Heub Song ◽  
Jun Young Lee ◽  
Sang Eun Lee ◽  
Jeong Ho Park
Keyword(s):  
Threshold Voltage ◽  
Voltage Distribution ◽  
Threshold Voltage Distribution ◽  
Narrow Cell ◽  
Nor Flash

scholarly journals Characterization of impulse propagation at the microscopic level across geometrically defined expansions of excitable tissue: multiple site optical recording of transmembrane voltage (MSORTV) in patterned growth heart cell cultures.

1994 ◽  
Vol 104 (2) ◽  
pp. 287-309 ◽  
Author(s):  
S Rohr ◽  
B M Salzberg
Keyword(s):  
Action Potential ◽  
Optical Recording ◽  
Neonatal Rat ◽  
Two Dimensional ◽  
Multiple Site ◽  
Patterned Growth ◽  
Excitable Tissue ◽  
Impulse Propagation ◽  
Transmembrane Voltage ◽  
Narrow Cell

Impulse propagation across sudden expansions of excitable tissue has been shown to exhibit various forms of conduction disturbance on a macroscopic scale, ranging from small delays to unidirectional or complete conduction block. With the present study, we attempted to characterize systematically the dependence of impulse propagation on the geometry of the underlying excitable tissue on a microscopic scale by investigating the spatio-temporal pattern of transmembrane voltage changes associated with impulse propagation from a narrow cell strand to a large cell area using multiple site optical recording of transmembrane voltage (MSORTV) in conjunction with patterned growth of neonatal rat heart cells in culture. While action potential propagation was smooth in the case of funneled expansions, delays of variable size occurred during propagation into rectangular or incised expansions. Close to the abrupt expansion, which functionally represented an increased electrical load to the narrow cell strand, the delays were accompanied by marked distortions of the action potential upstroke, exhibiting, in extreme cases, an initial depolarization to 50% followed by a delayed secondary depolarization to 100% of the full-signal amplitude. These distortions, which were based on bidirectional electrotonic interactions across the transition, were maximal immediately downstream from the expansion. The maximal slowing of impulse conduction across abrupt expansions was, in agreement with recently published results obtained from two-dimensional computer simulations, always situated in the expanded region. At high stimulation rates, the delays sometimes turned into intermittent unidirectional blocks, as revealed by reverse stimulation. These blocks were always characterized by a marked abbreviation of the action potentials upstream from the region causing the block which might, in an appropriate network, facilitate reentry because of the associated shortening of the refractory period. Because the patterns were composed of cells having identical membrane properties, the results show that the local action potential shape can be modulated profoundly by the two-dimensional architecture of the underlying cell ensemble alone.

God's Disputed Acre

1999 ◽  
Vol 50 (3) ◽  
pp. 464-497 ◽  
Author(s):  
DAVID DYMOND
Keyword(s):  
Social History ◽  
Local Population ◽  
Market Place ◽  
Christian Church ◽  
Mature Trees ◽  
Human Mortality ◽  
Corpus Christi ◽  
Narrow Cell

‘places consecrated to God [should] be venerated by all, and by no means profaned or in any way violated by a jarring or unsuitable activity, whether in working, jesting or playing …; [there should be] no laughter, shouting, immoderate mirth, indecent and indiscreet dances, indecent mockeries and harmful plays proper to the market-place or the stage’: letter of Bishop Edmund Lacy of Exeter, 1451Old churchyards enshrine vast amounts of personal and social history, although most of it, sadly, is not recoverable. Furthermore, they often display a romantic and touching beauty. When exploring villages and towns in all parts of Britain, many of us have been moved by the sight of a raised platform of hummocky turf surrounding an ancient Christian church, walled and gated, crossed by narrow paths, shaded by mature trees, dotted with leaning headstones and lichened table-tombs, perhaps with the weathered stump of a medieval preaching cross. Above all we are impressed by the thought that most of the local population, over many centuries, lies here, ‘each in his narrow cell for ever laid’. For example, a rural churchyard of half an acre at Widford in Hertfordshire is estimated to hold more than 5,000 burials, laid to rest over a period of at least 900 years. Such places have witnessed many solemn rituals: consecration by a bishop, occasional claims of sanctuary, sad clusters of mourners around open graves, the commemorative prayers and bell-ringing of All Saints' and All Souls' days, parochial processions on Palm Sunday or Corpus Christi, and at all periods the lonely vigils of the bereaved. Repeatedly opened and re-filled by generations of gravediggers, churchyards are potent reminders of human mortality which the living have mostly treated with respect, deep reflection and some superstition.

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