scholarly journals Comparison of the Bone Harvesting Capacity of an Intraoral Bone Harvesting Device and Three Different Implant Drills

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Hyun-Chang Lim ◽  
Kyung-In Ha ◽  
Ji-Youn Hong ◽  
Ji-Young Han ◽  
Seung-Il Shin ◽  
...  
Keyword(s):  
Particle Size ◽  
Dry Weight ◽  
Volumetric Measurement ◽  
Small Particles ◽  
Low Speed ◽  
Bone Particle ◽  
Bone Harvesting ◽  
Bone Particles

The aim of the present study was to compare bone-collecting capacity of bone harvesting device and minimally irrigated low-speed drilling using three implant systems. One bone harvesting device and three commercially available drill systems were compared using the osteotomies on bovine rib bones. The amount of the collected bone particle and particle size (<500 μm: small, 500–1000 μm: medium, and >1000 μm: large) were measured. Total wet (1.535±0.232 mL) and dry volume (1.147±0.425 mL) of the bone particles from bone harvesting device were significantly greater than three drill systems (wet volume: 1.225±0.187–1.27±0.29 mL and dry volume: 0.688±0.163–0.74±0.311 mL) (P<0.05). In all groups, the amount of large sized particles in wet and dry state was the greatest compared to that of medium and small particles. The dry weight of the bone particles showed the same tendency to volumetric measurement. In conclusion, total bone particles and large sized particles (>1000 μm) were harvested significantly greater by bone harvesting device than minimally irrigated low-speed drilling. The composition of particle size in all harvesting methods was similar to each other.

The Relationship Between Colliery-waste Particle Sizes and Plant Growth

1974 ◽  
Vol 1 (4) ◽  
pp. 281-284 ◽  
Author(s):  
Christopher G. Down
Keyword(s):  
Particle Size ◽  
Plant Growth ◽  
Water Retention ◽  
Size Range ◽  
Growth Period ◽  
Dry Weight ◽  
Particle Sizes ◽  
Small Particles ◽  
The Relationship ◽  
Water Holding

Seed germination and dry-weight production in Lolium perenne were examined in relation to growth on 12-years-old colliery waste separated into seven size-fractions. The size-range was from more than 4,000 μ to less than 125 μ, and the growth period was up to 30 days. Germination percentages after 6 days generally increased with decreasing particle-size, as did dry-weight. Shoot : root ratios also showed an inverse relationship with particle size.After 30 days there was no distinction between dryweights on different particle sizes, except that on the largest fractions it had been found impossible to keep the plants alive. Problems of water-holding capacity are discussed, and the significance of soil particle-size in revegetation work is examined, it being concluded that an admixture of small particles is important for water retention and plant growth.

scholarly journals Characteristics of Bone Particles and Measurement of Bone Particle Size from Mechanically Deboned Poultry

1981 ◽  
Vol 60 (7) ◽  
pp. 1443-1447 ◽  
Author(s):  
G.W. FRONING ◽  
F.E. CUNNINGHAM ◽  
D.R. SUDERMAN ◽  
BRIDGET M. SACKETT
Keyword(s):  
Particle Size ◽  
Bone Particle ◽  
Bone Particles

scholarly journals Splatters and Aerosols Contamination in Dental Aerosol Generating Procedures

2021 ◽  
Vol 11 (4) ◽  
pp. 1914
Author(s):  
Pingping Han ◽  
Honghui Li ◽  
Laurence J. Walsh ◽  
Sašo Ivanovski
Keyword(s):  
Particle Size ◽  
Disease Transmission ◽  
High Speed ◽  
Low Speed ◽  
Dental Procedures ◽  
Dental Equipment ◽  
Produce Contamination ◽  
Fluorescein Dye ◽  
Filter Papers ◽  
Airborne Disease

Dental aerosol-generating procedures produce a large amount of splatters and aerosols that create a major concern for airborne disease transmission, such as COVID-19. This study established a method to visualise splatter and aerosol contamination by common dental instrumentation, namely ultrasonic scaling, air-water spray, high-speed and low-speed handpieces. Mock dental procedures were performed on a mannequin model, containing teeth in a typodont and a phantom head, using irrigation water containing fluorescein dye as a tracer. Filter papers were placed in 10 different locations to collect splatters and aerosols, at distances ranging from 20 to 120 cm from the source. All four types of dental equipment produced contamination from splatters and aerosols. At 120 cm away from the source, the high-speed handpiece generated the greatest amount and size (656 ± 551 μm) of splatter particles, while the triplex syringe generated the largest amount of aerosols (particle size: 1.73 ± 2.23 μm). Of note, the low-speed handpiece produced the least amount and size (260 ± 142 μm) of splatter particles and the least amount of aerosols (particle size: 4.47 ± 5.92 μm) at 120 cm. All four dental AGPs produce contamination from droplets and aerosols, with different patterns of distribution. This simple model provides a method to test various preventive strategies to reduce risks from splatter and aerosols.

ISOLATION AND PHYSICOCHEMICAL CHARACTERIZATION OF STARCH FROM TARO BOLOSO-I TUBERS

INDIAN DRUGS ◽  
2018 ◽  
Vol 55 (07) ◽  
pp. 20-27
Author(s):  
Tamrat Balcha ◽  
◽  
Nisha Mary Joseph ◽  
Anteneh Belete
Keyword(s):  
Agricultural Research ◽  
Potato Starch ◽  
Physicochemical Characterization ◽  
Dry Weight ◽  
Weight Basis ◽  
Rice Starch ◽  
Small Particles ◽  
New Variety ◽  
Isolation And Characterization

Taro Boloso-I is a new variety of Colocasia esculenta (L. Schott) officially released from Areka Agricultural Research Center, Areka, Ethiopia. Its cultivation out yields a previously reported variety (Godare) by 67%. The study focuses on isolation and characterization of starch from this plant. Isolation of starch was done using saline and sodium hydroxide and characterized for its physicochemical constituents. Its yield on dry weight basis was 83.5 ± 1.6%. The native Taro Boloso-I starch (NTBIS) showed lower amylose to amylopectin ratio (20.7 ± 1.8% to 77.3 ± 2.1%, w/w) and significantly higher onset (68.40˚C), peak (75.46 ˚C) and endset (84.40 ˚C) temperatures of gelatinization than potato starch which has gelatinization range of 62.50–67.53–79.40 ˚C. The shapes of the granules were polyhedral/angular with an A-type polymorphism with a poor flow.The starch is comprised of small particles (mean diameter of 2.45 ± 0.11 μm).Taro Boloso-I starch possesses similarity with cereal starches like the rice starch though it is a tuber starch and moreover, on comparison with the previously reported varieties of Taro, there is difference in its properties.

Determination of Small Bone Particles in Meat

1968 ◽  
Vol 51 (6) ◽  
pp. 1175-1177 ◽  
Author(s):  
Robert M Hill ◽  
B D Hites
Keyword(s):  
Carbon Tetrachloride ◽  
Meat Products ◽  
The Other ◽  
Small Particles ◽  
Bone Content ◽  
Bone Particles ◽  
Small Bone ◽  
Good Agreement

Abstract Very small particles of bone can be separated from ground meats and meat products by the following procedure: The bulk of the meat is solubilized by digestion with papain and the bone is separated from the other nondigestible material according to its ability to settle in a carbon tetrachloride: acetone mixture. Turkey samples with widely varying bone content were analyzed, with good agreement between duplicate samples.

Dispersion of Particles on Liquid Surfaces

2011 ◽  
Author(s):  
Shriram B. Pillapakkam ◽  
Pushpendra Singh
Keyword(s):  
Numerical Simulation ◽  
Particle Size ◽  
Vertical Motion ◽  
Liquid Interface ◽  
Water Interface ◽  
Small Particles ◽  
Air Water Interface ◽  
Large Velocity ◽  
Simulation Results ◽  
Air Liquid Interface

In a recent study we have shown that when small particles, e.g., flour, pollen, glass, etc., contact an air-liquid interface, they disperse rapidly as if they were in an explosion. The rapid dispersion is due to the fact that the capillary force pulls particles into the interface causing them to accelerate to a large velocity. The vertical motion of a particle during its adsorption causes a radially-outward lateral (secondary) flow on the interface that causes nearby particles to move away. We present direct numerical simulation results for the adsorption of particles and show that the inertia of a particle plays an important role in its motion in the direction normal to a fluid-liquid interface. Although the importance of inertia diminishes with decreasing particle size, on an air-water interface the inertia continues to be important even when the size is as small as a few nanometers.

SIZE-DEPENDENT UPCONVERSION PROPERTIES OF Er3+ DOPED NANO Y2O3 PARTICLES

2011 ◽  
Vol 25 (04) ◽  
pp. 265-272 ◽  
Author(s):  
SIGUO XIAO ◽  
XIAOLIANG YANG
Keyword(s):  
Particle Size ◽  
Intensity Ratio ◽  
Radiative Decay ◽  
Luminescence Properties ◽  
Small Particles ◽  
Decay Probability ◽  
Size Dependent ◽  
Energy Transfers ◽  
Nano Crystal

Size-dependent upconversion properties for Er 3+-doped Y 2 O 3 nano-crystal have been investigated. The investigation shows that the reduction of the particle size intensifies the hypersensitive 2 H 11/2 → 4 I 15/2 transition, decreasing the intensity ratio of the 4 S 3/2 → 4 I 15/2 transition to the 2 H 11/2 → 4 I 15/2 one. The enhanced non-radiative decay probability and the intensified energy transfers in the small particles also enhance the population of the 4 F 9/2 level, leading to the increase of the intensity ratio of the red to the green one. It is believed that the absorbed hydroxyl and carbonate groups on the surface as well as the lowered symmetry of the local surroundings of the doped Er 3+ ions near the surface result in the size-dependent luminescence properties in the nano-crystal.

Particle-Size-Conversion Efficiency and Contaminant Concentrations in Lake Ontario Biota

1983 ◽  
Vol 40 (3) ◽  
pp. 328-336 ◽  
Author(s):  
Uwe Borgmann ◽  
D. M. Whittle
Keyword(s):  
Particle Size ◽  
Body Size ◽  
Conversion Efficiency ◽  
Food Chain ◽  
Lake Ontario ◽  
Dry Weight ◽  
Growth Efficiency ◽  
Fish Production ◽  
The Relationship ◽  
Zooplankton Production

The particle-size-conversion efficiency (log food consumption/production divided by log predator prey size ratio) is shown to be directly related to the relationship between the concentration of persistent contaminants accumulated primarily through the food chain and body size for organisms in pelagic ecosystems. The difference between particle-size-conversion efficiency for biomass and that for the contaminant gives the slope of the relationship between log contaminant concentration and log body size. This provides a useful theoretical framework for analyzing contaminant concentrations in aquatic biota without the need for specifying trophic level but still incorporating the idea of food chain accumulation. Concentrations of PCB, DDT, and mercury were examined in aquatic organisms from Lake Ontario, ranging in size from zooplankton to large salmonids (a 108 -fold range in dry weight). The slope of the double log plot of concentration versus weight varied from 0.20 to 0.22 for PCB and DDT and was approximately equal to 0.13 for mercury. This indicates that mercury is accumulated less efficiently through the food chain than PCB or DDT. After correcting for incomplete uptake and retention of the contaminant, an estimate of particle-size-conversion efficiency for biomass of about 0.26 was obtained, which agrees reasonably well with previous estimates obtained from growth efficiency experiments and analysis of particle-size spectra. These calculations indicate that potential fish production in Lake Ontario is ~ 120-fold lower than zooplankton production (for fish averaging 108-fold larger in body size as compared to zooplankton).Key words: particle-size-conversion efficiency, PCB, DDT, mercury, zooplankton production, fish production

Sign in / Sign up

Export Citation Format

Share Document