Visualization of crystal-matrix structure. In situ demineralization of mineralized turkey leg tendon and bone

1996 ◽  
Vol 59 (6) ◽  
pp. 474-479 ◽  
Author(s):  
K. S. Prostak ◽  
S. Lees
Keyword(s):  
Matrix Structure ◽  
Crystal Matrix ◽  
Turkey Leg Tendon

Otoconia perfect/imperfect crystals

1994 ◽  
Vol 52 ◽  
pp. 42-43
Author(s):  
César D. Fermin ◽  
Dale Martin
Keyword(s):  
Image Processing ◽  
Room Temperature ◽  
Phosphotungstic Acid ◽  
Gallus Domesticus ◽  
Crystal Matrix ◽  
Organic Templates ◽  
Image Processing Algorithms ◽  
Processing Algorithms ◽  
Diffraction Patterns

Otoconia of higher vertebrates are interesting biological crystals that display the diffraction patterns of perfect crystals (e.g., calcite for birds and mammal) when intact, but fail to produce a regular crystallographic pattern when fixed. Image processing of the fixed crystal matrix, which resembles the organic templates of teeth and bone, failed to clarify a paradox of biomineralization described by Mann. Recently, we suggested that inner ear otoconia crystals contain growth plates that run in different directions, and that the arrangement of the plates may contribute to the turning angles seen at the hexagonal faces of the crystals.Using image processing algorithms described earlier, and Fourier Transform function (2FFT) of BioScan Optimas®, we evaluated the patterns in the packing of the otoconia fibrils of newly hatched chicks (Gallus domesticus) inner ears. Animals were fixed in situ by perfusion of 1% phosphotungstic acid (PTA) at room temperature through the left ventricle, after intraperitoneal Nembutal (35mg/Kg) deep anesthesia. Negatives were made with a Hitachi H-7100 TEM at 50K-400K magnifications. The negatives were then placed on a light box, where images were filtered and transferred to a 35 mm camera as described.

Hierarchically porous ternary Au/ZnO@ZIF-8 nanocomposite: spatial in situ Au encapsulation and catalytic activity for the reduction of p-nitrophenol

RSC Advances ◽  
2016 ◽  
Vol 6 (113) ◽  
pp. 112451-112454 ◽  
Author(s):  
Xiaokai Song ◽  
Hongzhao Sun ◽  
Xin Cao ◽  
Zhixian Wang ◽  
Dejian Zhao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Au Nanoparticles ◽  
High Catalytic Activity ◽  
Nucleation Process ◽  
Hierarchically Porous ◽  
Crystal Matrix

A ternary Au/ZnO@ZIF-8 nanocomposite was prepared through in situ Au nanoparticles encapsulation from the ZnO surface into the ZIF-8 crystal matrix during its nucleation process, which exhibited high catalytic activity for the reduction of p-nitrophenol.

In-situ embedding of carbon dots in a trisodium citrate crystal matrix for tunable solid-state fluorescence

Carbon ◽  
2018 ◽  
Vol 136 ◽  
pp. 359-368 ◽  
Author(s):  
Cheng-Long Shen ◽  
Jin-Hao Zang ◽  
Qing Lou ◽  
Li-Xia Su ◽  
Zhen Li ◽  
...  
Keyword(s):  
Solid State ◽  
Carbon Dots ◽  
Trisodium Citrate ◽  
Crystal Matrix ◽  
Solid State Fluorescence ◽  
In Situ Embedding

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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