scholarly journals Birth and destruction of collective oscillations in a network of two populations of coupled type 1 neurons

2021 ◽  
Vol 31 (2) ◽  
pp. 023141
Author(s):  
Benjamin Jüttner ◽  
Christian Henriksen ◽  
Erik A. Martens
Keyword(s):  
Collective Oscillations ◽  
Two Populations

scholarly journals Does the sagittal spinal profile differ between the elderly Chinese populations with and without lumbar disc herniation?

2021 ◽  
Author(s):  
Jipeng Song ◽  
Fumin Pan ◽  
Chao Kong ◽  
Xiangyao Sun ◽  
Yu Wang ◽  
...  
Keyword(s):  
Disc Degeneration ◽  
Lumbar Disc Herniation ◽  
Disc Herniation ◽  
Lumbar Disc ◽  
Age Groups ◽  
Lumbar Disc Degeneration ◽  
Roussouly Classification ◽  
Asymptomatic Volunteers ◽  
Two Populations

Abstract Background The influence of spinopelvic morphology on the Chinese elderly LDH population was not clear. The purpose of this study is to explore its influence on the characteristics of lumbar disc herniation or degeneration. Methods 212 elderly patients with LDH and 213 asymptomatic volunteers were involved. Spinal parameters were measured on full-length X-ray and compared between two populations. In herniated group, sagittal profiles were determined according to the Roussouly classification, the degenerative grades, the herniated location and the number of intervertebral lumbar disc degeneration were evaluated from the L1 to S1 on MRI scans. The differences on them among Roussouly types were analyzed. Results There were no significant differences in BMI, the mean value of age and sex distribution between two populations. Patients were found to have significantly smaller TK, LL, and SS than those volunteers (p < 0.05), while contradicting observations on PT and TPA were obtained (p < 0.05). Roussouly type 1 and type 2 ( 50.4% and 28.7% respectively) are predominant in the LDH population and the proportion of type 1 in elderly LDH is further increased. Subjects with LDH in type 1 and 2 had lower mean herniated locations and fewer mean herniated numbers than those with type 3 and 4. Conclusions Sagittal spinopelvic parameters were found to be significantly different in elderly LDH patients and asymptomatic volunteers. There were significant differences in the Roussouly distribution among different age groups of LDH. Different Roussouly subtypes have different effects on lumbar disc degeneration and herniation.

Association of CTLA4 but not ICOS polymorphisms with type 1 diabetes in two populations with different disease rates

2009 ◽  
Vol 70 (7) ◽  
pp. 536-539 ◽  
Author(s):  
Konstantinos Douroudis ◽  
Antti-Pekka Laine ◽  
Mirkka Heinonen ◽  
Robert Hermann ◽  
Kati Lipponen ◽  
...  
Keyword(s):  
Type 1 Diabetes ◽  
Disease Rates ◽  
Two Populations

Association of a polymorphism in the betacellulin gene with type 1 diabetes mellitus in two populations

2006 ◽  
Vol 84 (7) ◽  
pp. 616-623 ◽  
Author(s):  
Kristi D. Silver ◽  
Victoria L. Magnuson ◽  
Magdalena Tolea ◽  
Jian Wang ◽  
William A. Hagopian ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Type 1 Diabetes ◽  
Type 1 Diabetes Mellitus ◽  
Two Populations

Enterovirus antibodies in relation to islet cell antibodies in two populations with high and low incidence of type 1 diabetes

Diabetes Care ◽  
1999 ◽  
Vol 22 (12) ◽  
pp. 2086-2088 ◽  
Author(s):  
M. Lonnrot ◽  
M. Knip ◽  
D. Marciulionyte ◽  
J. Rahko ◽  
B. Urbonaite ◽  
...  
Keyword(s):  
Type 1 Diabetes ◽  
Islet Cell ◽  
Islet Cell Antibodies ◽  
Low Incidence ◽  
Two Populations

Crystalloid Inclusions in Hepatocyte Mitochondria and Their Similarity to Cytoplasmic Crystalloids

1974 ◽  
Vol 32 ◽  
pp. 198-199
Author(s):  
Odell T. Minick ◽  
Hidejiro Yokoo
Keyword(s):  
Liver Disease ◽  
Alcoholic Liver Disease ◽  
Special Interest ◽  
Structural Variations ◽  
Mitochondrial Alterations ◽  
The Matrix ◽  
Crystalloid Inclusions ◽  
Liver Biopsies

Mitochondrial alterations were studied in 25 liver biopsies from patients with alcoholic liver disease. Of special interest were the morphologic resemblance of certain fine structural variations in mitochondria and crystalloid inclusions. Four types of alterations within mitochondria were found that seemed to relate to cytoplasmic crystalloids.Type 1 alteration consisted of localized groups of cristae, usually oriented in the long direction of the organelle (Fig. 1A). In this plane they appeared serrated at the periphery with blind endings in the matrix. Other sections revealed a system of equally-spaced diagonal lines lengthwise in the mitochondrion with cristae protruding from both ends (Fig. 1B). Profiles of this inclusion were not unlike tangential cuts of a crystalloid structure frequently seen in enlarged mitochondria described below.

Evidence for a shear mechanism for the precipitation of γ-zirconium hydride in zirconium

1978 ◽  
Vol 36 (1) ◽  
pp. 658-659
Author(s):  
G.J.C. Carpenter
Keyword(s):  
Elevated Temperature ◽  
Strain Field ◽  
Zirconium Hydride ◽  
Zirconium Atom ◽  
Atom Diffusion ◽  
Solvus Temperature ◽  
Hexagonal Close Packed ◽  
Partial Dislocations ◽  
The Face

In zirconium-hydrogen alloys, rapid cooling from an elevated temperature causes precipitation of the face-centred tetragonal (fct) phase, γZrH, in the form of needles, parallel to the close-packed <1120>zr directions (1). With low hydrogen concentrations, the hydride solvus is sufficiently low that zirconium atom diffusion cannot occur. For example, with 6 μg/g hydrogen, the solvus temperature is approximately 370 K (2), at which only the hydrogen diffuses readily. Shears are therefore necessary to produce the crystallographic transformation from hexagonal close-packed (hep) zirconium to fct hydride.The simplest mechanism for the transformation is the passage of Shockley partial dislocations having Burgers vectors (b) of the type 1/3<0110> on every second (0001)Zr plane. If the partial dislocations are in the form of loops with the same b, the crosssection of a hydride precipitate will be as shown in fig.1. A consequence of this type of transformation is that a cumulative shear, S, is produced that leads to a strain field in the surrounding zirconium matrix, as illustrated in fig.2a.

Direct structure images of 30° partial dislocation cores in silicon

1987 ◽  
Vol 45 ◽  
pp. 242-243
Author(s):  
J. C. Barry ◽  
H. Alexander
Keyword(s):  
Dislocation Core ◽  
Preparation Technique ◽  
Burgers Vector ◽  
Vector Type ◽  
Sample Preparation Technique ◽  
Lattice Images ◽  
Dislocation Core Structure ◽  
Type Lattice ◽  
Direct Inspection

Dislocations in silicon produced by plastic deformation are generally dissociated into partials. 60° dislocations (Burgers vector type 1/2[101]) are dissociated into 30°(Burgers vector type 1/6[211]) and 90°(Burgers vector type 1/6[112]) dislocations. The 30° partials may be either of “glide” or “shuffle” type. Lattice images of the 30° dislocation have been obtained with a JEM 100B, and with a JEM 200Cx. In the aforementioned experiments a reasonable but imperfect match was obtained with calculated images for the “glide” model. In the present experiment direct structure images of 30° dislocation cores have been obtained with a JEOL 4000EX. It is possible to deduce the 30° dislocation core structure by direct inspection of the images. Dislocations were produced by compression of single crystal Si (sample preparation technique described in Alexander et al.).

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