scholarly journals Axons and myelinating glia: An intimate contact

IUBMB Life ◽  
2011 ◽  
pp. n/a-n/a ◽  
Author(s):  
Lida Zoupi ◽  
Maria Savvaki ◽  
Domna Karagogeos
Keyword(s):  
Intimate Contact ◽  
Myelinating Glia

Suppression of γ’ Precipitation in a Laser-Melted Nickel-Base Alloy

1977 ◽  
Vol 35 ◽  
pp. 270-271
Author(s):  
J. M. Walsh ◽  
J. C. Whittles ◽  
B. H. Kear ◽  
E. M. Breinan
Keyword(s):  
Cooling Rate ◽  
Base Alloy ◽  
Material Surface ◽  
Intimate Contact ◽  
Absorbed Power ◽  
Perfect Contact ◽  
Nickel Base ◽  
Rapidly Solidified ◽  
Limiting Case ◽  
The Heat Transfer Coefficient

Conventionally cast γ’ precipitation hardened nickel-base superalloys possess well-defined dendritic structures and normally exhibit pronounced segregation. Splat quenched, or rapidly solidified alloys, on the other hand, show little or no evidence for phase decomposition and markedly reduced segregation. In what follows, it is shown that comparable results have been obtained in superalloys processed by the LASERGLAZE™ method.In laser glazing, a sharply focused laser beam is traversed across the material surface at a rate that induces surface localized melting, while avoiding significant surface vaporization. Under these conditions, computations of the average cooling rate can be made with confidence, since intimate contact between the melt and the self-substrate ensures that the heat transfer coefficient is reproducibly constant (h=∞ for perfect contact) in contrast to the variable h characteristic of splat quenching. Results of such computations for pure nickel are presented in Fig. 1, which shows that there is a maximum cooling rate for a given absorbed power density, corresponding to the limiting case in which melt depth approaches zero.

vitreal cells and specialized phagocytes in the chick embryo retina: A TEM and SEM study

1990 ◽  
Vol 48 (3) ◽  
pp. 330-331
Author(s):  
M.A. Cuadros ◽  
M.J. Martinez-Guerrero ◽  
A. Rios
Keyword(s):  
Cell Death ◽  
Plasma Membrane ◽  
Acid Phosphatase ◽  
Chick Embryo ◽  
Basement Membrane ◽  
Sem Images ◽  
Intimate Contact ◽  
Cellular Processes ◽  
Sem Study ◽  
Free Cells

In the chick embryo retina (days 3-4 of incubation), coinciding with an increase in cell death, specialized phagocytes characterized by intense acid phosphatase activity have been described. In these preparations, all free cells in the vitreal humor (vitreal cells) were strongly labeled. Conventional TEM and SEM techniques were used to characterize them and attempt to determine their relationship with retinal phagocytes.Two types of vitreal cells were distinguished. The first are located at some distance from the basement membrane of the neuroepithelium, and are rounded, with numerous vacuoles and thin cytoplasmic prolongations. Images of exo- and or endocytosis were frequent; the cells showed a well-developed Golgi apparatus (Fig. 1) In SEM images, the cells was covered with short cellular processes (Fig. 3). Cells lying parallel to or alongside the basement membrane are elongated. The plasma membrane is frequently in intimate contact with the basement membrane. These cells have generally a large cytoplasmic expansion (Fig. 5).

Atomic Resolution in Crystal Aperture Stem

1990 ◽  
Vol 48 (1) ◽  
pp. 236-237
Author(s):  
J T Fourie
Keyword(s):  
Optical System ◽  
Spherical Aberration ◽  
Three Dimensional ◽  
Transmission Function ◽  
Optical Systems ◽  
Bragg Angle ◽  
Electron Optical System ◽  
Intimate Contact ◽  
Diffraction Effects ◽  
Design Aspect

The attempts at improvement of electron optical systems to date, have largely been directed towards the design aspect of magnetic lenses and towards the establishment of ideal lens combinations. In the present work the emphasis has been placed on the utilization of a unique three-dimensional crystal objective aperture within a standard electron optical system with the aim to reduce the spherical aberration without introducing diffraction effects. A brief summary of this work together with a description of results obtained recently, will be given.The concept of utilizing a crystal as aperture in an electron optical system was introduced by Fourie who employed a {111} crystal foil as a collector aperture, by mounting the sample directly on top of the foil and in intimate contact with the foil. In the present work the sample was mounted on the bottom of the foil so that the crystal would function as an objective or probe forming aperture. The transmission function of such a crystal aperture depends on the thickness, t, and the orientation of the foil. The expression for calculating the transmission function was derived by Hashimoto, Howie and Whelan on the basis of the electron equivalent of the Borrmann anomalous absorption effect in crystals. In Fig. 1 the functions for a g220 diffraction vector and t = 0.53 and 1.0 μm are shown. Here n= Θ‒ΘB, where Θ is the angle between the incident ray and the (hkl) planes, and ΘB is the Bragg angle.

Synthese und Strukturuntersuchungen von Iodocupraten(I): II. Diiodocuprate(I) RCuI2 mit isoherten Ketten 1∞ [Cul4/2–]·R1 = N-Methylpyridinium, R2 = Dimethyl ( 3 - dimethylamino - 2 - aza - 2 -propenyliden ) ammonium [1] / Syntheses and Structure Analyses of Iodocuprates(I): II. Diiodocuprates(I) RCuI2 with Isolated Chains 1∞ [CuI4/2–]; R1 = N-Methylpyridinium, R2 = Dimethyl(3-dimethylamino-2-aza-2-propenyliden) Ammonium

1983 ◽  
Vol 38 (1) ◽  
pp. 57-61 ◽  
Author(s):  
Hans Hartl ◽  
Farbod Mahdjour-Hassan-Abadi
Keyword(s):  
Organic Cations ◽  
Intimate Contact

N-Methylpyridinium-diiodocuprate(I), C6H8NCuI2 and dimethyl(3-dimethylamino-2-aza-2-propenyliden)ammonium-diiodocuprate(I), C6H14N3CuI2, are obtained by reacting Cu with C6H8NI3 or C6H14N3I3 in acetone. Both compounds are built up by the organic cations and chains of edge sharing tetrahedra1∞[Cul4/2-]. The iodocuprate(I) anions are in intimate contact with the cations via intermolecular I···C interactions. Though nearly the same average Cu-I distance of 267.2 or 268.2 pm was found for both iodocuprate(I) anions there are different Cu-Cu distances (301-354 pm).

Situating embodied instruction – proxemics and body knowledge

2021 ◽  
Vol 7 (s4) ◽  
Author(s):  
Darren James Reed
Keyword(s):  
The Body ◽  
Public Display ◽  
Intimate Contact ◽  
Dance Class ◽  
Performance Training ◽  
Playing Field ◽  
Close Analysis ◽  
Spoken Interaction ◽  
Different Levels ◽  
Body Knowledge

Abstract In various ways the movement and experience of the body is instructed by others. This may be in the dance class or on the playing field. In these interactions, one person claims knowledge of the other’s body and rights to instruct how that body functions, moves, and feels. By undertaking a close analysis of embodied and spoken interaction within performance training sessions from a multimodal conversation analytic perspective, this paper will identify one kind of broad sequential trajectory – from intimate contact to public display - that shows how an instructor claims rights over the internal workings of another’s body by traversing different levels of proximity and sensorial modalities.

S-doped TiO2 spindles wrapped by graphene with high exposed {001} faces and intimate contact

2021 ◽  
Author(s):  
Tangtong Ju ◽  
Yue Dai ◽  
Hailong Tang ◽  
Meiling Wang ◽  
Min wang ◽  
...  
Keyword(s):  
Intimate Contact ◽  
Doped Tio2

Focusing on India’s Look East Policy: India–China relationship from 1947 to 2020

2021 ◽  
pp. 223386592110183
Author(s):  
Kaushik Roy
Keyword(s):  
20Th Century ◽  
Industrial Revolution ◽  
International System ◽  
China Policy ◽  
Economic Competition ◽  
Intimate Contact ◽  
Late 20Th Century ◽  
Republic Of China ◽  
China And India ◽  
The World

Before the onset of the industrial revolution, China and India were the two biggest powers in Eurasia. Their total population comprised almost half of the world’s population. And the GNP of premodern China was half of the combined GNP of the world. Before circa 1600 CE, most of the textiles and iron in the world were manufactured in these two countries. China and India suffered a temporary eclipse during the age of colonialism. However, with the rise of the economic and military power of China and India from the late 20th century, it seems that these two countries are bound to reclaim their traditional positions as big powers in the international system. However, there is a caveat. In the premodern era, the Himalayas prevented any intimate contact between the ‘dragon’ and the ‘elephant’. But, from the mid-20th century, advances in technology, economic competition and the annexation of Tibet by the People’s Republic of China (PRC) among other factors resulted in China and India coming into direct contact with each other. The result has been cooperation–competition–conflict. And this has had consequences not only for these two countries but for the whole world. The present article attempts to trace the troubled trajectory of India’s China policy from the late 1940s (when these two countries became independent) up to the present day.

scholarly journals Croonian lecture—Aspects of animal locomotion

1939 ◽  
Vol 128 (850) ◽  
pp. 28-62 ◽  
Keyword(s):  
Biological Activity ◽  
Animal Life ◽  
Intimate Contact ◽  
Animal Locomotion ◽  
Time Signals ◽  
Marine Engineers ◽  
Great Complexity

The power of locomotion is, perhaps, one of the most striking attributes of animal life. It occurs in all groups of animals and is characterized by two conspicuous features: (i) In no other biological activity is an animal brought into closer and more intimate contact with its environment. (ii) Closely related animals may display striking differences of locomotory pattern yet in every cast the animal is able to deal precisely and efficiently with mechanical problems of great complexity. For many years, the study of animal locomotion has been concerned with two, apparently distinct, types of problems. First, attention has been paid to the mechanical or kinematic principles which animals employ in order to progress from one place to another. In many terrestrial animals these principles are relatively simple, for their limbs represent levers of one type or another; in other cases the mechanical principles are more obscure—we know little concerning the kinematics of movement of a fish or a snail, and little or nothing of the forces which propel a bird actively through the air. These problems have long attracted attention and it is encouraging to know that they are now being attacked by methods as precise and as controlled as those employed by aeronautical or marine engineers. The second type of problem is of a different nature; it is concerned with physiological nature of the locomotory machine. What is the nature of the neuro-muscular mechanism which enables and animal to utilize its muscular energy with such conspicuous precision and efficiency? How far are the movements dependent on the higher nervous centres, and how far are they dependent on the receipt of time signals from the outside world?

Laser-Deposition Of High Luminance Thin Film Phosphors

1994 ◽  
Vol 345 ◽  
Author(s):  
J. A. Greer ◽  
H. J. Van Hook ◽  
M. D. Tabat ◽  
H. Q. Nguyen ◽  
G. Gammie ◽  
...  
Keyword(s):  
Thin Film ◽  
Electric Fields ◽  
Spot Size ◽  
Porous Powder ◽  
Powder Phosphor ◽  
High Luminance ◽  
Intimate Contact ◽  
Field Emitter ◽  
Display Performance ◽  
Phosphor Screens

AbstractHigh luminance (brightness) thin-film phosphor materials have potential use in a variety of applications including heads-up, helmet-mounted, and electroluminescent displays, as well as in emerging flat-panel displays based on field emitter technology. Phosphor materials in thin film form offer several advantages over conventional powder phosphor screens. Since the film is nearly fully dense and in intimate contact with the underlying substrate, thin film phosphors transfer heat to the face plate much quicker than conventional, more porous, powder phosphor materials. This allows thin film phosphor screens to be driven at higher power levels, and therefore produce higher luminance, assuming the efficiency of the powder and film are the same. Fully dense phosphor films have smaller surface area, and will outgas less than conventional powder phosphor materials. Thin film phosphors have smaller grain sizes than conventional powder phosphor materials which will provide for smaller spot size, and thus, higher resolution. Furthermore, in applications such as field-emitter displays, powder phosphor particles can be physically dislodged from the screen due to the high electric fields produced by the large potential difference between the anode screen and gate electrode (or cathode), or dislodged by arcing which may occur if a powder particle protrudes significantly above the screen surface. Dislodged particles or damage produced by arcing could degrade display performance. Dense, thin-film phosphor materials which are well adhered to transparent substrates will provide much smoother surface morphologies, and should be able to withstand significantly higher electric field strength without arcing or screen degradation due to the dislocation of particles.

scholarly journals A STUDY OF THE RELATION OF PULMONARY AND BRONCHIAL CIRCULATION

1913 ◽  
Vol 18 (5) ◽  
pp. 500-506 ◽  
Author(s):  
Albert A. Ghoreyeb ◽  
Howard T. Karsner
Keyword(s):  
Pulmonary Artery ◽  
Lung Tissue ◽  
Bronchial Artery ◽  
Venous Blood ◽  
Pulmonary Arteries ◽  
The Other ◽  
Main Trunk ◽  
Intimate Contact ◽  
Bronchial Arteries ◽  
Bronchial Circulation

The most striking point brought out in this study is that as long as a definite pressure is maintained in either the pulmonary or bronchial circulations, the admixture of bloods is extremely limited. It is easily conceivable that more mixture occurs normally than under the conditions of the experiment, but there is no reason for considering this to be a large difference. If, however, in either system the pressure sinks to zero the possibility of supply by the other system becomes evident. It takes much longer for the mass injected through the bronchial arteries to penetrate to all parts of the lung than when the mass is injected through the pulmonary artery; but when accomplished, the injection reaches to all capillaries including those of the pleura, the only vessels remaining uninjected being the larger trunks of the pulmonary artery. On the other hand, the injection of the bronchial vessels by way of the pulmonary arteries is not complete with normal pressure, but occurs rapidly when a high pulmonary pressure is employed. It is therefore probable that either circulation can suffice for the simple nutritive demands of the lung if the other system is interfered with. It has been shown that embolism of the pulmonary artery, without other circulatory disturbance, does not lead to necrosis of the affected area of the lung, but it is probable that the preservation of circulation is not due to collateral bronchial circulation so much as to the free anastomosis and early division into capillaries of the pulmonary artery. In support of this statement is the fact that the appearance is not altered when the bronchials are ligated at their origin. The same ligation shows no subsequent interference with the nutrition of the bronchi up to a period of five weeks, demonstrating that the pulmonary circulation is sufficient to provide for the nutrition of the bronchi. If, however, as Virchow has shown, the pulmonary artery supplying an entire lobe be occluded, the bronchial circulation can and does suffice for the nutrition of the lobe. In the case of the occlusion of a branch of the pulmonary artery the pressure in the area interfered with does not sink to zero because of the collateral circulation in this area; whereas, if the main trunk is occluded no collateral supply is available, the pressure sinks to zero, and the bronchial artery becomes available as a source of blood supply. It must be remembered that the lung tissue, as a whole, has ready access to oxygen and this gas is the nutritive element acquired by the blood in the lungs. From these studies it would appear that the part of the lung tissue not in intimate contact with oxygen in the air is supplied by oxygenated blood of the bronchial arteries, and that the tissues through which the pulmonary blood circulates take up whatever organized nutriment they need from the pulmonary blood and possibly provide for their oxygen and carbon dioxide interchange (which must be very slight) either directly with the alveolar air, or by finding sufficient oxygen in the venous blood of the pulmonary artery. The studies of the injected specimens confirm Küttner's findings of a very rapid breaking up of the pulmonary artery into capillaries. In all the specimens studied it was found that although the pleural vessels can be injected by way of the bronchial arteries when there is zero pressure in the pulmonary arteries, yet when the two sets of vessels are injected simultaneously in the dog, the pleural vessels invariably derive their supply of injection mass from the pulmonary artery.

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