Particle Size Preference of Six Ant Species (Hymenoptera: Formicidae)

2019 ◽  
Vol 54 (4) ◽  
pp. 370
Author(s):  
Reid M. Ipser ◽  
Wayne A. Gardner
Keyword(s):  
Particle Size ◽  
Size Preference

APPARENT FEED PARTICLE SIZE PREFERENCE BY BROILERS

1988 ◽  
Vol 68 (3) ◽  
pp. 923-930 ◽  
Author(s):  
F. J. PORTELLA ◽  
L. J. CASTON ◽  
S. LEESON
Keyword(s):  
Particle Size ◽  
Chemical Analysis ◽  
Key Words ◽  
Feed Intake ◽  
Feed Consumption ◽  
Broiler Chicks ◽  
Disappearance Rate ◽  
Large Particles ◽  
Effect Of Particle Size ◽  
Size Preference

Broiler chicks of different ages were used to study particle size disappearance and the effect of particle size on feed intake. The disappearance of particles larger than 1.18 mm was obvious at all ages. However, it was noticed that at 8 and 16 d disappearance of particles between > 1.18 mm and < 2.36 mm was most pronounced. As birds became older, disappearance rate was greatest for particles > 2.36 mm. Throughout a 24-h period, particle breakdown was noted. Birds did eat these smaller particles at the end of a 24-h period, especially when the concentration of large particles was reduced. Chemical analysis revealed that birds selected material on the basis of particle size, since nutrient composition of the diet and of different diet fractions did not change throughout the day. Changing particle size abruptly from crumbles to pellets did not adversely affect overall feed consumption (P > 0.05) or bird performance. Key words: Broiler, particle size preference, crumbles, pellets

Diet particle size preference and optimal ration for mud crab, Scylla serrata, larvae fed microbound diets

Aquaculture ◽  
2004 ◽  
Vol 230 (1-4) ◽  
pp. 493-505 ◽  
Author(s):  
Jerome Genodepa ◽  
Paul C. Southgate ◽  
Chaoshu Zeng
Keyword(s):  
Particle Size ◽  
Scylla Serrata ◽  
Mud Crab ◽  
Size Preference

Mouthpart morphology and food habits of a Pampean population of Cloeon dipterum (Linnaeus, 1761) (Ephemeroptera: Baetidae)

2020 ◽  
Vol 56 ◽  
pp. 21
Author(s):  
Bárbara Pamela Banegas ◽  
María Andrea Casset ◽  
Agustina Silvera ◽  
Luciana Rocha
Keyword(s):  
Particle Size ◽  
Food Preference ◽  
Feeding Habits ◽  
Optical Microscope ◽  
Functional Feeding Groups ◽  
Gut Content ◽  
Larval Stages ◽  
Covered Area ◽  
Cloeon Dipterum ◽  
Size Preference

Knowledge of the feeding habits of aquatic insects and assignation to different functional feeding groups contributes to a better comprehension of aquatic ecosystems. The feeding habits of larval stages (4–6 mm) of Cloeon dipterum (Linnaeus, 1761) were studied through mouthpart morphology, gut content and were tested in food particle size preference experiments. The description of the mouthparts consisted in the dissection of them and their observation in an optical microscope. Gut content analysis was carried out by ventral dissection of the thorax to isolate the digestive tract. The content of each larva was homogenized, mounted on slides and observed under an optical microscope at 400× magnification with a graduated eyepiece. Food preference experiments consisted on offering fine particulate organic matter (FPOM) and coarse (CPOM) leaves of Laurus nobilis simultaneously. Mouthparts are characterized by robust mandibles with well-developed and asymmetric molar surfaces and maxillae and labium with developed palps, with short setae. Gut content of C. dipterum was dominated by fine detritus represented by 76.9% (SD = 25.7) of the covered area. Also, in the food preference experiments was detected that FPOM consumption was greater than CPOM. Consequently, we consider that the larval stages of C. dipterum are functionally classified as collectors-gatherers preferring fine particle size, and secondary scrapers for CPOM manipulation.

scholarly journals APPARENT FEED PARTICLE SIZE PREFERENCE BY LAYING HENS

1988 ◽  
Vol 68 (3) ◽  
pp. 915-922 ◽  
Author(s):  
F. J. PORTELLA ◽  
L. J. CASTON ◽  
S. LEESON
Keyword(s):  
Particle Size ◽  
Chemical Analysis ◽  
Key Words ◽  
Feed Intake ◽  
Laying Hens ◽  
Adaptation Period ◽  
Disappearance Rate ◽  
Small Particles ◽  
Large Particles ◽  
Size Preference

Trials were designed to investigate the effect of feed particle size on apparent feed intake of laying hens. Feed was offered to five different groups of four birds each as either regular crumbles, mash, large crumbles (trained birds), large crumbles (untrained birds) or small crumbles, respectively. Except for the untrained birds, all birds were given a 15-d adaptation period. In each trial hens were offered 200 g of feed at 05:00 h and at each subsequent hour, until 20:00 h, feed was removed from the trough, sieved, weighed, remixed and returned to the feeders. Chemical analysis of the diet and various diet fractions was undertaken. There was marked disappearance of larger particles when birds were fed regular crumbles. However, smaller particles disappeared as the concentration of large ones decreased throughout the day. There was no marked disappearance of particles smaller than 0.60 mm. Feed intake was comparable when regular crumbles or mash rations were fed. Overall feed intake increased when small particles were offered, while intake decreased when the feed was changed abruptly to one of only large particles. It is concluded that particle size in regular crumbled layer feed is not uniform, and that particle size influences disappearance rate. Key words: Layer, particle preference, nutrient preference

Particle size preference, gut filling and evacuation rates of the rotifer Brachionus “Cayman” using polystyrene latex beads

Aquaculture ◽  
2008 ◽  
Vol 282 (1-4) ◽  
pp. 75-82 ◽  
Author(s):  
Andreas Baer ◽  
Chris Langdon ◽  
Scott Mills ◽  
Carsten Schulz ◽  
Kristin Hamre
Keyword(s):  
Particle Size ◽  
Polystyrene Latex ◽  
Latex Beads ◽  
Size Preference

Microstructural characterization of laser-melted/roller-quenched dicalcium silicate

1988 ◽  
Vol 46 ◽  
pp. 582-583
Author(s):  
C. J. Chan ◽  
K. R. Venkatachari ◽  
W. M. Kriven ◽  
J. F. Young
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Shape Change ◽  
Microstructural Characterization ◽  
Particle Size Effect ◽  
Dicalcium Silicate ◽  
Laser Melting ◽  
Uniform Size ◽  
Cell Shape Change ◽  
Wide Range

Dicalcium silicate (Ca2SiO4) is a major component of Portland cement. It has also been investigated as a potential transformation toughener alternative to zirconia. It has five polymorphs: α, α'H, α'L, β and γ. Of interest is the β-to-γ transformation on cooling at about 490°C. This transformation, accompanied by a 12% volume increase and a 4.6° unit cell shape change, is analogous to the tetragonal-to-monoclinic transformation in zirconia. Due to the processing methods used, previous studies into the particle size effect were limited by a wide range of particle size distribution. In an attempt to obtain a more uniform size, a fast quench rate involving a laser-melting/roller-quenching technique was investigated.The laser-melting/roller-quenching experiment used precompacted bars of stoichiometric γ-Ca2SiO4 powder, which were synthesized from AR grade CaCO3 and SiO2xH2O. The raw materials were mixed by conventional ceramic processing techniques, and sintered at 1450°C. The dusted γ-Ca2SiO4 powder was uniaxially pressed into 0.4 cm x 0.4 cm x 4 cm bars under 34 MPa and cold isostatically pressed under 172 MPa. The γ-Ca2SiO4 bars were melted by a 10 KW-CO2 laser.

Analytical Electron Microscopy study of two vehicle-aged automotive exhaust catalysts having dissimilar activities

1989 ◽  
Vol 47 ◽  
pp. 272-273
Author(s):  
Sooho Kim ◽  
M. J. D’Aniello
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Noble Metal ◽  
Catalyst Deactivation ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Metal Particles ◽  
Automotive Exhaust ◽  
Exhaust Catalysts ◽  
Analytical Electron

Automotive catalysts generally lose-agtivity during vehicle operation due to several well-known deactivation mechanisms. To gain a more fundamental understanding of catalyst deactivation, the microscopic details of fresh and vehicle-aged commercial pelleted automotive exhaust catalysts containing Pt, Pd and Rh were studied by employing Analytical Electron Microscopy (AEM). Two different vehicle-aged samples containing similar poison levels but having different catalytic activities (denoted better and poorer) were selected for this study.The general microstructure of the supports and the noble metal particles of the two catalysts looks similar; the noble metal particles were generally found to be spherical and often faceted. However, the average noble metal particle size on the poorer catalyst (21 nm) was larger than that on the better catalyst (16 nm). These sizes represent a significant increase over that found on the fresh catalyst (8 nm). The activity of these catalysts decreases as the observed particle size increases.

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