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Articoli di riviste sul tema "Aggregation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Dowling, Natalie A., Stephen J. Hall, and Richard McGarvey. "Assessing population sustainability and response to fishing in terms of aggregation structure for greenlip abalone (Haliotis laevigata) fishery management." Canadian Journal of Fisheries and Aquatic Sciences 61, no. 2 (2004): 247–59. http://dx.doi.org/10.1139/f03-165.

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The greenlip abalone (Haliotis laevigata) population in Waterloo Bay, South Australia, has undergone collapse and fishery closure twice since 1978. A rich data set, including survey measures of degree of spatial aggregation, has been gathered over that time and provides a unique opportunity to identify factors accounting for persistence or collapse, an issue that is of significance to abalone fisheries worldwide. Statistical analyses of fishery and survey data were undertaken to infer functional relationships between catch, effort, recruitment, adult density, and extent of aggregation. Catch r

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2

Martin, Ian D., and David R. Barton. "The formation of diapause aggregations by larvae of Neophylax fuscus Banks (Trichoptera: Limnephilidae) and their influence on mortality and development." Canadian Journal of Zoology 65, no. 11 (1987): 2612–18. http://dx.doi.org/10.1139/z87-396.

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Fifth-instar larvae of the caddisfly Neophylax fuscus Banks (Trichoptera: Limnephilidae) enter a 4-month diapause in April after aggregating on the undersides of stream rocks in gravel cases. Aggregations have up to several hundred members, and densities within aggregations range from 1000 to 17 263 cases/m2. Field experiments conducted between 1984 and 1986 showed that larvae preferred to settle where initial larvae had already attached, but that there was no evidence for a chemical cue for aggregation. Mortality during the diapause but before pupation averaged 37.9%. Both exposure to low wat

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3

Dowling, Natalie A., Stephen J. Hall, and Richard McGarvey. "Simulations of random fishing behaviour as an independent validation for the effect of active targeting of greenlip abalone (Haliotis laevigata) aggregations." Canadian Journal of Fisheries and Aquatic Sciences 61, no. 2 (2004): 260–72. http://dx.doi.org/10.1139/f03-164.

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Although active targeting of abalone aggregations is documented for various species, its impact on large aggregations is poorly understood. As large aggregations make the greatest contribution to reproductive success, yet are vulnerable to exploitation, it is important to understand how targeted fishing impacts aggregation structure. If observed postfishing patterns are equally likely to have occurred in response to more random, nontargeted fishing, then changes in aggregation patterns cannot be directly attributed to aggregation-based targeting behaviour. The effect of targeted fishing on gre

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4

Rüger, Korbinian. "Aggregation with Constraints." Utilitas 32, no. 4 (2020): 454–71. http://dx.doi.org/10.1017/s095382082000014x.

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AbstractUtilitarianism is often criticized because of its reliance on the interpersonal aggregation of harms and benefits. However, since the rejection of all forms of interpersonal aggregation strikes most people as implausible, some critics of utilitarianism have proposed theories of Limited Aggregation. These occupy the middle ground between fully aggregative and non-aggregative views. Recently, Limited Aggregation has been criticized for having counterintuitive implications that seem even worse than the counterintuitive implications of fully aggregative and non-aggregative views it tried t

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5

Yu, Yushi, Jiangnan Sun, Yaqing Chang, and Chong Zhao. "High fitness areas drive the aggregation of the sea urchin Mesocentrotus nudus." PeerJ 10 (January 19, 2022): e12820. http://dx.doi.org/10.7717/peerj.12820.

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Sea urchin aggregation is a common phenomenon in coastlines. However, it remains controversial whether sea urchins form resource aggregations or behavioral aggregations in a non-spawning season. To clarify, we studied the aggregative responses to food and predators in the sea urchin Mesocentrotus nudus when high fitness areas (HFAs) were scarce versus sufficient. By taking the occupied area of each sea urchin (test diameter + spines = 4.5 cm) as a square (4.5 cm × 4.5 cm), we set scarce HFAs for the sea urchins in Experiment 1 (the squares of HFAs: the area occupied by experimental sea urchins

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6

Burgos, Julian M., and John K. Horne. "Sensitivity analysis and parameter selection for detecting aggregations in acoustic data." ICES Journal of Marine Science 64, no. 1 (2006): 160–68. http://dx.doi.org/10.1093/icesjms/fsl007.

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Abstract Burgos, J. M., and Horne, J. K. 2007. Sensitivity analysis and parameter selection for detecting aggregations in acoustic data. ICES Journal of Marine Science, 64: 160–168. A global sensitivity analysis was conducted on the algorithm implemented in the Echoview ® software to detect and describe aggregations in acoustic backscatter. Multiple aggregation detections were performed using walleye pollock (Theragra chalcogramma) data from the eastern Bering Sea. Walleye pollock form distinct aggregations and dense and diffuse layers. In each aggregation detection, input parameters defining

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7

Ambarak, Muhammad Zhaqif, Medy Ompi, Darus Sa’dah J. Paransa, Joice R. T. S. L. Rimper, Antonius P. Rumengan, and Nego E. Bataragoa. "Keanekaragaman Makrobentos yang Menempati Agregasi Kerang, Septifer bilocullaris di Tiwoho, Kabupaten Minahasa Utara, Sulawesi Utara." JURNAL PESISIR DAN LAUT TROPIS 9, no. 3 (2021): 133. http://dx.doi.org/10.35800/jplt.9.3.2021.38043.

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The purpose of this study was to determine the type and diversity of macrobenthos that inhabit the aggregation of Septifer bilocularis shellfish in the coastal waters of Tiwoho, North Minahasa Regency, North Sulawesi. Sampling of macrobenthos was carried out using core (PVC), both at the position of small aggregation (AK), middle large aggregation (ABT), and large edge aggregation (ABP). Sampling was carried out 4 times on different aggregations of shellfish. The data has been analyzed using the Diversity Index (H), the dominance index (D), and the Uniformity Index (E). It was identified that

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8

Shishkov, Olga, and Orit Peleg. "Social insects and beyond: The physics of soft, dense invertebrate aggregations." Collective Intelligence 1, no. 2 (2022): 263391372211237. http://dx.doi.org/10.1177/26339137221123758.

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Aggregation is a common behavior by which groups of organisms arrange into cohesive groups. Whether suspended in the air (like honey bee clusters), built on the ground (such as army ant bridges), or immersed in water (such as sludge worm blobs), these collectives serve a multitude of biological functions, from protection against predation to the ability to maintain a relatively desirable local environment despite a variable ambient environment. In this review, we survey dense aggregations of a variety of insects, other arthropods, and worms from a soft matter standpoint. An aggregation can be

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9

Nanami, Atsushi. "Spawning aggregations of checkered snapper (Lutjanus decussatus) and blackspot snapper (L. fulviflamma): seasonality, lunar-phase periodicity and spatial distribution within spawning ground." PeerJ 11 (September 11, 2023): e15991. http://dx.doi.org/10.7717/peerj.15991.

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Snappers (family Lutjanidae) are important fisheries target species and some species are known to form spawning aggregations at particular spawning grounds. The present study investigated the ecological characteristics of fish aggregations of two snapper species (checkered snapper Lutjanus decussatus and blackspot snapper L. fulviflamma) that form at a particular site. Specifically, the aims were to clarify (1) seasonality and lunar-phase periodicity of fish aggregation formation, (2) fine-scale spatial distribution of fish density (spatial variations of fish density at intervals of several-te

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Vasconcelos, Raquel, Sara Rocha, and Xavier Santos. "Sharing refuges on arid islands: ecological and social influence on aggregation behaviour of wall geckos." PeerJ 5 (January 10, 2017): e2802. http://dx.doi.org/10.7717/peerj.2802.

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BackgroundThe extent of social behaviour among reptiles is underappreciated. Two types of aggregations are recognized in lizards: ecological and social, i.e., related to the attraction to a site or to animals of the same species, respectively. As most lizards are territorial, aggregations increase the probability of aggressive interactions among individuals, a density-dependent behaviour.MethodsAfter some spurious observations of aggregation behaviour in the endemic Cabo Verde nocturnal geckoTarentola substituta,we conducted a field-based study in order to thoroughly characterize it. We sample

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11

Kovács, Zoltán, Tibor Csizmadia, István Mihálcz, and Zsolt T. Kosztyán. "Multipurpose Aggregation in Risk Assessment." Mathematics 10, no. 17 (2022): 3166. http://dx.doi.org/10.3390/math10173166.

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Risk-mitigation decisions in risk-management systems are usually based on complex risk indicators. Therefore, aggregation is an important step during risk assessment. Aggregation is important when determining the risk of components or the overall risk of different areas or organizational levels. In this article, the authors identify different aggregation scenarios. They summarize the requirements of aggregation functions and characterize different aggregations according to these requirements. They critique the multiplication-based risk priority number (RPN) used in existing applications and pr

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12

Kumar, Mukesh, Monika Sethi, Shalli Rani, Dipak Kumar Sah, Salman A. AlQahtani, and Mabrook S. Al-Rakhami. "Secure Data Aggregation Based on End-to-End Homomorphic Encryption in IoT-Based Wireless Sensor Networks." Sensors 23, no. 13 (2023): 6181. http://dx.doi.org/10.3390/s23136181.

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By definition, the aggregating methodology ensures that transmitted data remain visible in clear text in the aggregated units or nodes. Data transmission without encryption is vulnerable to security issues such as data confidentiality, integrity, authentication and attacks by adversaries. On the other hand, encryption at each hop requires extra computation for decrypting, aggregating, and then re-encrypting the data, which results in increased complexity, not only in terms of computation but also due to the required sharing of keys. Sharing the same key across various nodes makes the security

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13

Flynn, Adrian J., and John R. Paxton. "Spawning aggregation of the lanternfish Diaphus danae (family Myctophidae) in the north-western Coral Sea and associations with tuna aggregations." Marine and Freshwater Research 63, no. 12 (2012): 1255. http://dx.doi.org/10.1071/mf12185.

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A spawning aggregation of the lanternfish Diaphus danae in the Coral Sea, that is fed on by spawning aggregations of yellowfin and bigeye tuna, has been sampled by mid-water trawling for the first time. Males and females in the aggregation occurred at a ratio of 23 to 1 and occupied two non-overlapping size classes (males 71.2–95.1-mm standard length (SL), females 99.0–121.4-mm SL). Hydrated oocytes with single oil droplets, which indicated imminent spawning, were in higher proportion in the first trawl (2134 hours to 2234 hours) than in the final trawl (0324 hours to 0424 hours) through the a

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Archer, Stephanie K., Scott A. Heppell, Brice X. Semmens, et al. "Patterns of color phase indicate spawn timing at a Nassau grouper Epinephelus striatus spawning aggregation." Current Zoology 58, no. 1 (2012): 73–83. http://dx.doi.org/10.1093/czoolo/58.1.73.

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Abstract Nassau grouper Epinephelus striatus are a large bodied, top level predator that is ecologically important throughout the Caribbean. Although typically solitary, Nassau grouper form large annual spawning aggregations at predictable times in specific locations. In 2003, The Cayman Islands Marine Conservation Board established protection for a newly rediscovered Nassau grouper spawning aggregation on Little Cayman, British West Indies. The large size of this aggregation provides a unique opportunity to study the behavior of Nassau grouper on a relatively intact spawning aggregation. Duri

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15

Die, David J., and Nick Ellis. "Aggregation dynamics in penaeid fisheries: banana prawns (Penaeus merguiensis) in the Australian Northern Prawn Fishery." Marine and Freshwater Research 50, no. 7 (1999): 667. http://dx.doi.org/10.1071/mf98124.

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In the Gulf of Carpentaria, banana prawns (Penaeus merguiensis) form dense aggregations that are targeted by trawl vessels with the help of small aeroplanes and colour sounders. Such aggregating behaviour is rare in penaeids and may lead to a change in catchability when stock abundance changes. Commercial logbook data containing trawl-tow records have been used to identify the location, time of capture and biomass of over 600 banana prawn aggregations during 1991–92. The number of aggregations decreased by 83% in the first three weeks of the fishing season. The average biomass of an aggregatio

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16

Bejines, Carlos, Sergio Ardanza-Trevijano, and Jorge Elorza. "On Self-Aggregations of Min-Subgroups." Axioms 10, no. 3 (2021): 201. http://dx.doi.org/10.3390/axioms10030201.

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Preservation of structures under aggregation functions is an active area of research with applications in many fields. Among such structures, min-subgroups play an important role, for instance, in mathematical morphology, where they can be used to model translation invariance. Aggregation of min-subgroups has only been studied for binary aggregation functions. However, results concerning preservation of the min-subgroup structure under binary aggregations do not generalize to aggregation functions with arbitrary input size since they are not associative. In this article, we prove that arbitrar

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17

Kelton, JG, JC Moore, and WG Murphy. "Studies investigating platelet aggregation and release initiated by sera from patients with thrombotic thrombocytopenic purpura." Blood 69, no. 3 (1987): 924–28. http://dx.doi.org/10.1182/blood.v69.3.924.924.

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Abstract Many patients with thrombotic thrombocytopenic purpura (TTP) have a platelet aggregating factor in their serum that may be pathologically linked with the disease process. To help characterize the type of platelet aggregation and platelet release induced by the sera from seven TTP patients, we measured the ability of a variety of inhibitors of platelet function as well as the ability of monoclonal antibodies (MoAbs) against platelet glycoproteins to inhibit TTP sera-induced platelet aggregation and release. These results were compared with the ability of the same inhibitors to block pl

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Kelton, JG, JC Moore, and WG Murphy. "Studies investigating platelet aggregation and release initiated by sera from patients with thrombotic thrombocytopenic purpura." Blood 69, no. 3 (1987): 924–28. http://dx.doi.org/10.1182/blood.v69.3.924.bloodjournal693924.

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Abstract (sommario):

Many patients with thrombotic thrombocytopenic purpura (TTP) have a platelet aggregating factor in their serum that may be pathologically linked with the disease process. To help characterize the type of platelet aggregation and platelet release induced by the sera from seven TTP patients, we measured the ability of a variety of inhibitors of platelet function as well as the ability of monoclonal antibodies (MoAbs) against platelet glycoproteins to inhibit TTP sera-induced platelet aggregation and release. These results were compared with the ability of the same inhibitors to block platelet ag

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19

Lee, Sunwoo, Tuo Zhang, and A. Salman Avestimehr. "Layer-Wise Adaptive Model Aggregation for Scalable Federated Learning." Proceedings of the AAAI Conference on Artificial Intelligence 37, no. 7 (2023): 8491–99. http://dx.doi.org/10.1609/aaai.v37i7.26023.

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In Federated Learning (FL), a common approach for aggregating local solutions across clients is periodic full model averaging. It is, however, known that different layers of neural networks can have a different degree of model discrepancy across the clients. The conventional full aggregation scheme does not consider such a difference and synchronizes the whole model parameters at once, resulting in inefficient network bandwidth consumption. Aggregating the parameters that are similar across the clients does not make meaningful training progress while increasing the communication cost. We propo

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Copping, Joshua P., Bryce D. Stewart, Colin J. McClean, James Hancock, and Richard Rees. "Does bathymetry drive coastal whale shark (Rhincodon typus)aggregations?" PeerJ 6 (June 8, 2018): e4904. http://dx.doi.org/10.7717/peerj.4904.

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BackgroundThe whale shark (Rhincodon typus) is known to aggregate in a number of coastal locations globally, however what causes these aggregations to form where they do is largely unknown. This study examines whether bathymetry is an important driver of coastal aggregation locations forR. typusthrough bathymetry’s effect on primary productivity and prey availability. This is a global study taking into account all coastal areas withinR. typus’range.MethodsR. typusaggregation locations were identified through an extensive literature review. Global bathymetric data were compared atR. typusaggreg

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Teng, Che-Ming, Ya-Fei Kang, Ya-Ling Chang, Feng-Nien Ko, Shu-Chen Yang, and Feng-Lin Hsu. "ADP-mimicking Platelet Aggregation Caused by Rugosin E, an Ellagitannin Isolated from Rosa rugosa Thunb." Thrombosis and Haemostasis 77, no. 03 (1997): 555–61. http://dx.doi.org/10.1055/s-0038-1656005.

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SummaryAmong the nine ellagitannins, rugosin E was the most potent platelet aggregating agent with an EC50 of 1.5 ± 0.1 µM in rabbit platelets and 3.2 ±0.1 µM in human platelets. The aggregations caused by rugosin E and ADP were inhibited by EGTA, PGE1, mepacrine, sodium nitroprusside and neomycin, but not by indomethacin, verapamil, TMB-8, BN52021 and GR32191B. Rugosin E-induced thromboxane formation was suppressed by indomethacin, EGTA, PGE,, verapamil, mepacrine, TMB-8 and neomycin. ADP-scavenging agents, such as CP/CPK and apyrase inhibited concentration-dependently ADP (20 εM)-, but not r

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YAGER, RONALD R. "CHOQUET AGGREGATION USING ORDER INDUCING VARIABLES." International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 12, no. 01 (2004): 69–88. http://dx.doi.org/10.1142/s0218488504002667.

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We discuss the OWA and Choquet integral aggregation operators and point out the central role the ordering operation plays in these operators. We extend the capabilities of the Choquet integral aggregation by allowing the ordering to be induced by some values other then those being aggregated. This allows us to consider an induced Choquet Choquet integral aggregation operator. We look at the properties of this operator. We then look at its applications. Among the applications considered are aggregations guided by linguistic and other ordinal structures. We look at the use of induced aggregation

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Mangubhai, Sangeeta, Muhammad Saleh, Suprayitno, et al. "Do Not Stop: The Importance of Seamless Monitoring and Enforcement in an Indonesian Marine Protected Area." Journal of Marine Biology 2011 (2011): 1–11. http://dx.doi.org/10.1155/2011/501465.

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The harvesting of groupers (Serranidae) in Indonesia for the live reef food fish trade (LRFFT) has been ongoing since the late 1980s. Eight sites in Komodo National Park that included two fish spawning aggregation (FSA) sites were monitored for groupers and humphead wrasse,Cheilinus undulatus, from 1998 to 2003 and from 2005 to 2008 to examine temporal changes in abundance and assess the effectiveness of conservation and management efforts. Monitoring identified FSA sites for squaretail coralgrouper,Plectropomus areolatus, and brown-marbled grouper,Epinephelus fuscoguttatus. Both species forme

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Saravanan, K., and R. Asokan. "An New Efficient Cluster Based Detection Mechanisms for Distributed Denial of Services (DDoS) Attacks." International Journal of Mathematics and Computers in Simulation 15 (November 27, 2021): 147–52. http://dx.doi.org/10.46300/9102.2021.15.27.

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Cluster aggregation of statistical anomaly detection is a mechanism for defending against denial of service attack (dos) and distributed denial-of-service (DDoS) attacks. DDoS attacks are treated as a congestioncontrol problem; because most of the congestion is occurred in the malicious hosts not follow the normal endto- end congestion control. Upstream routers are also notified to drop such packets in order that the router’s resources are used to route legitimate traffic hence term cluster aggregation. If the victim suspects that the cluster aggregations are solved by most of the clients, it

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Zahedi Khameneh, Azadeh, and Adem Kilicman. "Some Construction Methods of Aggregation Operators in Decision-Making Problems: An Overview." Symmetry 12, no. 5 (2020): 694. http://dx.doi.org/10.3390/sym12050694.

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Aggregating data is the main line of any discipline dealing with fusion of information from the knowledge-based systems to decision-making. The purpose of aggregation methods is to convert a list of objects, all belonging to a given set, into a single representative object of the same set usually by an n-ary function, so-called aggregation operator. As the useful aggregation functions for modeling real-life problems are limited, the basic problem is to construct a proper aggregation operator, usually a symmetric one, for each situation. During the last decades, a number of construction methods

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Carter, A. J., and S. Heptinstall. "Platelet Aggregation in Whole Blood: The Role of Thromboxane A2 and Adenosine Diphosphate." Thrombosis and Haemostasis 54, no. 03 (1985): 612–16. http://dx.doi.org/10.1055/s-0038-1660081.

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SummaryThe platelet aggregation that occurred in whole blood in response to several aggregating agents (collagen, arachidonic acid, adenosine diphosphate, adrenaline and thrombin) was measured using an Ultra-Flo 100 Whole Blood Platelet Counter. The amounts of thromboxane B2 produced were measured by radioimmunoassay. The effects of various inhibitors of thromboxane synthesis and the effects of apyrase, an enzyme that destroys adenosine diphosphate, were determined.Platelet aggregation was always accompanied by the production of thromboxane B2, and the amounts produced depended on the nature a

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Hornberger, Zachary, Bruce Cox, and Raymond R. Hill. "Analysis of the effects of spatiotemporal demand data aggregation methods on distance and volume errors." Journal of Defense Analytics and Logistics 5, no. 1 (2021): 29–45. http://dx.doi.org/10.1108/jdal-03-2020-0003.

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Purpose Large/stochastic spatiotemporal demand data sets can prove intractable for location optimization problems, motivating the need for aggregation. However, demand aggregation induces errors. Significant theoretical research has been performed related to the modifiable areal unit problem and the zone definition problem. Minimal research has been accomplished related to the specific issues inherent to spatiotemporal demand data, such as search and rescue (SAR) data. This study provides a quantitative comparison of various aggregation methodologies and their relation to distance and volume b

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Burgess-Wilson, ME, SR Cockbill, GI Johnston, and S. Heptinstall. "Platelet aggregation in whole blood from patients with Glanzmann's thrombasthenia." Blood 69, no. 1 (1987): 38–42. http://dx.doi.org/10.1182/blood.v69.1.38.38.

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Abstract We examined platelet aggregation in platelet-rich plasma (PRP) and in whole blood from two patients with Glanzmann's thrombasthenia. In PRP, aggregation was measured by monitoring the changes in light absorbance that occurred in response to aggregating agents; to measure platelet aggregation in whole blood, we used a platelet counting technique. In PRP, the patients' platelets showed defective aggregation in response to ADP, adrenaline, arachidonic acid (AA), and collagen, but normal agglutination occurred in response to ristocetin. In whole blood, however, platelet aggregation in res

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Burgess-Wilson, ME, SR Cockbill, GI Johnston, and S. Heptinstall. "Platelet aggregation in whole blood from patients with Glanzmann's thrombasthenia." Blood 69, no. 1 (1987): 38–42. http://dx.doi.org/10.1182/blood.v69.1.38.bloodjournal69138.

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We examined platelet aggregation in platelet-rich plasma (PRP) and in whole blood from two patients with Glanzmann's thrombasthenia. In PRP, aggregation was measured by monitoring the changes in light absorbance that occurred in response to aggregating agents; to measure platelet aggregation in whole blood, we used a platelet counting technique. In PRP, the patients' platelets showed defective aggregation in response to ADP, adrenaline, arachidonic acid (AA), and collagen, but normal agglutination occurred in response to ristocetin. In whole blood, however, platelet aggregation in response to

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Azzimonti, Marina, Eva de Francisco, and Per Krusell. "Aggregation and Aggregation." Journal of the European Economic Association 6, no. 2-3 (2008): 381–94. http://dx.doi.org/10.1162/jeea.2008.6.2-3.381.

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Yanhua, Hu, and Xincai Zhang. "Aggregation Tree Based Data Aggregation Algorithm in Wireless Sensor Networks." International Journal of Online Engineering (iJOE) 12, no. 06 (2016): 10. http://dx.doi.org/10.3991/ijoe.v12i06.5408.

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Abstract: In wireless sensor networks, efficient and effective data aggregation algorithms can prolong the network lifecycle by reducing communication of redundant data and improve the security of the networks. Tradition data aggregation algorithms in wireless sensor networks mainly aim to improve the energy utilization, and ignore the security and lifecycle. In order to get a good trade-off between these requirements, we proposed a data aggregation algorithm based on constructing a data aggregation tree. After give a formalism description of the problem, we proposed a data aggregation tree co

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Li, Xiang, M. Fikret Ercan, and Hong Cai Chen. "A Geometry Based Algorithm for Swarm Aggregations." Applied Mechanics and Materials 536-537 (April 2014): 1052–58. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1052.

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This paper describes a Geometry Based algorithm (GBA) developed for aggregation behavior of a swarm of simple robots. Aggregation is one of the primary behaviors for swarm robots. Decentralization and stability for single-swarm aggregations are the two major properties of the GBA algorithm presented in this paper. Our analysis, together with extensive simulation studies considering various swarm size and configurations, indicate that the GBA algorithm is scalable and effective for swarm aggregations.

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Hayashi, S., I. Shimizu, H. Miyauchi, and S. Watanabe. "Increased platelet aggregation in psoriasis." Acta Dermato-Venereologica 65, no. 3 (1985): 258–62. http://dx.doi.org/10.2340/0001555565258262.

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Platelet aggregation was measured in fasting platelet-rich plasma in 25 psoriatics, 6 of whom were diabetic, 50 normal controls, and 24 diabetics. The aggregating agents employed to induce platelet aggregation included ADP, epinephrine and collagen. Platelet aggregation was significantly increased in psoriatics compared with normal controls. An additive effect was observed when diabetes was associated with psoriasis, with platelet aggregation being further increased by ADP. Platelet aggregability was re-evaluated in 7 psoriatics after they presented with clearing of the rash. The increased pla

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Anschau, Valesca, and Rafael Sanjuán. "Fibrinogen Gamma Chain Promotes Aggregation of Vesicular Stomatitis Virus in Saliva." Viruses 12, no. 3 (2020): 282. http://dx.doi.org/10.3390/v12030282.

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The spread of viruses among cells and hosts often involves multi-virion structures. For instance, virions can form aggregates that allow for the co-delivery of multiple genome copies to the same cell from a single infectious unit. Previously, we showed that vesicular stomatitis virus (VSV), an enveloped, negative-strand RNA virus, undergoes strong aggregation in the presence of saliva from certain individuals. However, the molecular components responsible for such aggregation remain unknown. Here we show that saliva-driven aggregation is protein dependent, and we use comparative proteomics to

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Stafford, Richard, Mark S. Davies, and Gray A. Williams. "Self-Organization of Intertidal Snails Facilitates Evolution of Aggregation Behavior." Artificial Life 14, no. 4 (2008): 409–23. http://dx.doi.org/10.1162/artl.2008.14.4.14401.

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Many intertidal snails form aggregations during emersion to minimize desiccation stress. Here we investigate possible mechanisms for the evolution of such behavior. Two behavioral traits (following of mucus trails, and crevice occupation), which both provide selective advantages to individuals that possess the traits over individuals that do not, result in self-organization of aggregations in crevices in the rock surface. We suggest that the existence of self-organizing aggregations provides a mechanism by which aggregation behavior can evolve. The inclusion of an explicitly coded third behavi

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Hosn, Wafa Aboul, and John A. Downing. "Influence of Cover on the Spatial Distribution of Littoral-zone Fishes." Canadian Journal of Fisheries and Aquatic Sciences 51, no. 8 (1994): 1832–38. http://dx.doi.org/10.1139/f94-185.

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Littoral-zone fish are thought to reduce predation pressure by seeking refuge within macrophyte beds or near the lake bottom, or by aggregating. We used underwater video to measure the spatial aggregation of prey fishes in the littoral habitat. At low density, fish were more aggregated off the bottom in open habitats than when found off the bottom within macrophyte beds. At high densities, fish were primarily observed near the lake bottom, and the presence or absence of macrophyte beds had little influence on spatial behavior. No difference could be detected in the degree of aggregation seen i

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Tao, Yunting, Fanyu Kong, Jia Yu, and Qiuliang Xu. "EPPSA: Efficient Privacy-Preserving Statistical Aggregation Scheme for Edge Computing-Enhanced Wireless Sensor Networks." Security and Communication Networks 2022 (May 2, 2022): 1–12. http://dx.doi.org/10.1155/2022/7359134.

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Abstract (sommario):

In edge computing-enhanced wireless sensor networks (WSNs), multidimensional data aggregation can optimize the utilization of computation resources for data collection. How to improve the efficiency of data aggregation has gained considerable attention in both academic and industrial fields. This article proposes a new efficient privacy-preserving statistical aggregation scheme (EPPSA) for WSNs, in which statistical data can be calculated without exposing the total number of sensor devices to control center. The EPPSA scheme supports multiple statistical aggregation functions, including arithm

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Cui, Baorang, Fei Pan, Bin Ding, Feng Zhang, Yong Ma, and Yuli Chen. "Fiber Aggregation in Nanocomposites: Aggregation Degree and Its Linear Relation with the Percolation Threshold." Materials 16, no. 1 (2022): 15. http://dx.doi.org/10.3390/ma16010015.

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Abstract (sommario):

Fiber aggregation in nanocomposites has an important effect on macroscopic electrical performance. To quantitatively evaluate its effect, an index to characterize the degree of aggregation is imperative and, ideally, it should have three features simultaneously, i.e., (1) single-parametric, dimensionless, and physically meaningful, (2) applicable to different aggregation topologies, and (3) one-to-one, corresponding to material electrical properties. However, these features remain largely unexplored. Here, we propose a new aggregation degree that is defined as the average increment of the fibe

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CALZADA, Catherine, Evelyne VERICEL, and Michel LAGARDE. "Low concentrations of lipid hydroperoxides prime human platelet aggregation specifically via cyclo-oxygenase activation." Biochemical Journal 325, no. 2 (1997): 495–500. http://dx.doi.org/10.1042/bj3250495.

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Abstract (sommario):

There is mounting evidence that lipid peroxides contribute to pathophysiological processes and can modulate cellular functions. The aim of the present study was to investigate the effects of lipid hydroperoxides on platelet aggregation and arachidonic acid (AA) metabolism. Human platelets, isolated from plasma, were incubated with subthreshold (i.e. non-aggregating) concentrations of AA in the absence or presence of hydroperoxyeicosatetraenoic acids (HPETEs). Although HPETEs alone had no effect on platelet function, HPETEs induced the aggregation of platelets co-incubated with non-aggregating

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Hordyk, Adrian R., Neil R. Loneragan, Geoff Diver, and Jeremy D. Prince. "A cost-effective alternative for assessing the size of deep-water fish aggregations." Marine and Freshwater Research 62, no. 5 (2011): 480. http://dx.doi.org/10.1071/mf10260.

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Abstract (sommario):

Acoustic methodologies are important tools for monitoring deep-water fish and have the potential to provide high-precision estimates of aggregation size. However, they can be costly to design and implement for monitoring fish. Data from 2 years of scientific surveys of the spawning aggregations of orange roughy (Hoplostethus atlanticus, Collett, 1889) on the Cascade Plateau, Tasmania, collected using commercial fishing vessels and echosounders, were used to develop a cost-effective approach for estimating the size of deep-water aggregations. Criteria were developed to standardise the identific

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Reumers, Joke, Frederic Rousseau, and Joost Schymkowitz. "Multiple Evolutionary Mechanisms Reduce Protein Aggregation." Open Biology Journal 2, no. 1 (2009): 176–84. http://dx.doi.org/10.2174/1874196700902010176.

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Abstract (sommario):

The folding of polypeptides into stable globular protein structures requires protein sequences with a relatively high hydrophobicity and secondary structure propensity. These biophysical properties, however, also favor protein aggregation via the formation of intermolecular beta-sheets and, as a result, globular structure and aggregation are inextricable properties of protein polypeptides. Aggregates that are enriched in beta-sheet structures have been found in diseased tissues in association with at least twenty different human disorders and the effect of aggregation on protein function inclu

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42

Lenz, Hans-J., and Bernhard Thalheim. "A Formal Framework of Aggregation for the OLAP-OLTP Model." JUCS - Journal of Universal Computer Science 15, no. (1) (2009): 273–303. https://doi.org/10.3217/jucs-015-01-0273.

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Abstract (sommario):

OLAP applications are widely used in business applications. They are often (implicitly) defined on top of OLTP systems and extensively use aggregation and transformation functions. The main OLAP data structure is a multidimensional table with three kinds of attributes: so-called dimension attributes, implicit attributes given by aggregation functions and fact attributes. Domains of dimension attributes are structured and thus support a variety of aggregations. These aggregations are used to generate new values for the fact attributes. In this paper we systematically develop a theory for OLAP a

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Putman, S. H., and S.-H. Chung. "Effects of Spatial System Design on Spatial Interaction Models. 1: The Spatial System Definition Problem." Environment and Planning A: Economy and Space 21, no. 1 (1989): 27–46. http://dx.doi.org/10.1068/a210027.

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Abstract (sommario):

Rather little has been published about systematic empirical research on the problem of spatial aggregation and its effects on spatial interaction models. Of the work which has been published, all of it has dealt almost exclusively with single-parameter spatial interaction models. In this article five different aggregation procedures are examined. The experiments were based on the use of a multivariate multiparametric spatial interaction model. A first set of hypotheses tests was performed with respect to the sensitivity of model parameters to spatial aggregation methods. A second set was perfo

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Johannes, Mark R. S. "Prey Aggregation Is Correlated with Increased Predation Pressure in Lake Fish Communities." Canadian Journal of Fisheries and Aquatic Sciences 50, no. 1 (1993): 66–73. http://dx.doi.org/10.1139/f93-008.

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Abstract (sommario):

Aggregations of prey fish, golden shiner (Notemigonus crysoleucas), were examined during 7 yr of predator manipulations in two lakes to determine whether they responded to changes in predation pressure and varied with time-of-day, age, and habitat. Regression analysis was used to examine aggregation in 12 replicate prey densities from two time periods, two ages, two habitats, three sample series, and seven predator densities. Aggregation was assessed as the variance of mean densities for each treatment combination. Multiple regression and ANCOVA analyses indicated that (1) golden shiner aggreg

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45

GREAR, DANIEL A., and PETER HUDSON. "The dynamics of macroparasite host-self-infection: a study of the patterns and processes of pinworm (Oxyuridae) aggregation." Parasitology 138, no. 5 (2011): 619–27. http://dx.doi.org/10.1017/s0031182011000096.

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Abstract (sommario):

SUMMARYObjectives.Among parasites, Taylor's power law identifies a tight relationship in aggregation of macroparasite infection intensity with few exceptions; notably, the nematode family Oxyuridae tends to have higher than expected aggregation. Oxyuridae infect a wide range of mammalian hosts and have a unique reproductive strategy that involves conventional horizontal transmission, as well as re-infection of an already infected host. We asked the question, do the unique aspects of pinworm life-history explain an exception to the widely observed patterns of aggregation of parasite populations

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46

Sils, D., S. E. Rodgers, J. V. Lloyd, K. M. Wilson, D. M. Siebert, and F. Bochner. "Inhibition of platelet aggregation and thromboxane production by low concentrations of aspirin in vitro." Clinical Science 74, no. 5 (1988): 491–97. http://dx.doi.org/10.1042/cs0740491.

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Abstract (sommario):

1. The aspirin concentrations previously reported to inhibit platelet aggregation in vitro (40–500 μmol/l) are much greater than those required in vivo in man (5 μmol/l). 2. Human platelet-rich plasma was incubated with buffer or various aspirin concentrations at 37°C for up to 4.5 h. Platelet aggregation and thromboxane generation were measured in response to collagen (0.4–6.3 μg/ml) and adenosine 5′-pyrophosphate (0.5–4 μmol/l). 3. The concentration of aspirin needed to inhibit platelet aggregation in response to a critical concentration of aggregating agent (lowest concentration to cause gr

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47

Jin, LeSheng, Ronald R. Yager, Jana Špirková, Radko Mesiar, Daniel Paternain, and Humberto Bustince. "OWA aggregation with dual preferences for basic uncertain information." Journal of Intelligent & Fuzzy Systems 40, no. 3 (2021): 4535–44. http://dx.doi.org/10.3233/jifs-201374.

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Abstract (sommario):

Basic Uncertain Information (BUI) as a newly introduced concept generalized a wide range of uncertain information. The well-known Ordered Weighted Averaging (OWA) operators can flexibly and effectively model bipolar preferences of decision makers over given real valued input vector. However, there are no extant methods for OWA operators to be carried out over given BUI vectors. Against this background, this study firstly discusses the interval transformation for BUI and elaborately explains the reasonability within it. Then, we propose the corresponding preference aggregations for BUI in two d

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48

Shi, Liangquan, Gegentuya Huanood, Shuto Miura, Masahiro Kuragano, and Kiyotaka Tokuraku. "Real-Time 3D Imaging and Inhibition Analysis of Human Serum Amyloid A Aggregations Using Quantum Dots." International Journal of Molecular Sciences 25, no. 20 (2024): 11128. http://dx.doi.org/10.3390/ijms252011128.

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Abstract (sommario):

Serum amyloid A (SAA) is one of the most important precursor amyloid proteins discovered during the study of amyloidosis, but its underlying aggregation mechanism has not yet been well elucidated. Since SAA aggregation is a key step in the pathogenesis of AA amyloidosis, amyloid inhibitors can be used as a tool to study its pathogenesis. Previously, we reported a novel microliter-scale high-throughput screening (MSHTS) system for screening amyloid β (Aβ) aggregation inhibitors based on quantum dot (QD) fluorescence imaging technology. In this study, we report the aggregation of human SAA (hSAA

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Sugiyama, T., M. Okuma, F. Ushikubi, S. Sensaki, K. Kanaji, and H. Uchino. "A novel platelet aggregating factor found in a patient with defective collagen-induced platelet aggregation and autoimmune thrombocytopenia." Blood 69, no. 6 (1987): 1712–20. http://dx.doi.org/10.1182/blood.v69.6.1712.1712.

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Abstract (sommario):

Abstract We found a novel platelet aggregating factor in a patient with steroid- responsive immune thrombocytopenic purpura that is associated with defective collagen-induced platelet functions. The aggregating factor and platelet functions were analyzed. The patient, a 58-year-old female, had purpura and prolonged bleeding time despite adequate platelet counts (greater than 140,000/microL) after steroid therapy. The patient's platelets responded normally to all agonists except collagen. Platelet adhesion to collagen fibrils was decreased. The patient's plasma induced irreversible aggregation

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50

Sugiyama, T., M. Okuma, F. Ushikubi, S. Sensaki, K. Kanaji, and H. Uchino. "A novel platelet aggregating factor found in a patient with defective collagen-induced platelet aggregation and autoimmune thrombocytopenia." Blood 69, no. 6 (1987): 1712–20. http://dx.doi.org/10.1182/blood.v69.6.1712.bloodjournal6961712.

Testo completo

Abstract (sommario):

We found a novel platelet aggregating factor in a patient with steroid- responsive immune thrombocytopenic purpura that is associated with defective collagen-induced platelet functions. The aggregating factor and platelet functions were analyzed. The patient, a 58-year-old female, had purpura and prolonged bleeding time despite adequate platelet counts (greater than 140,000/microL) after steroid therapy. The patient's platelets responded normally to all agonists except collagen. Platelet adhesion to collagen fibrils was decreased. The patient's plasma induced irreversible aggregation and ATP r

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