Consulta: subjectFacets:"Cycle"
Registros recuperados: 10
Data/hora: 07/06/2024 03:47:46

Searching Explanations of Nature in the Mirror World of Math
Provedor de dados: 7
Autores: Scheffer, Marten; Wageningen Agricultural University; Marten.Scheffer@wur.nl.
Despite the huge scientific progress of the last century, the dynamics of complex systems such as the atmosphere, human societies, and ecosystems remain difficult to understand and predict. Nonetheless, our ability to carve the future depends largely on our insight into the functioning of such complex systems. Complex systems are the focus of considerable mathematical theory. Rather than referring to any particular part of the world, such theory addresses what seems to be another world: a world of strange attractors, catastrophe folds, torus destruction, and homoclinic bifurcations. So disparate is the language and notation in this discipline that it is hard to imagine that it has any thing to do with reality as we know it. Indeed, it deals with a kind of...
Tipo: Peer-Reviewed Reports
Palavras-chave: Bifurcation; Catastrophe; Chaos; Cycle; Daphnia; Fish; Macrophyte; Model; Multiple stable states; Plankton; Predation; Trophic cascade.
Ano: 1999

Cycle de reproduction naturelle de l'huître creuse Crassostrea gigas
Provedor de dados: 5
Autores: Goulletquer, Philippe.
Since its introduction to French coasts in the 1970s, Crassostrea gigas completes its reproductive cycle—i.e. regular annual recruitment and establishment of natural populations—in only two sectors (Charentes coast and Arcachon Bay). In other areas of Pacific oyster production (Normandy, Brittany, Vendée, Mediterranean), complete gametogenesis may occur, resulting in spawning events and even recruitment in favourable temperatures. Temperature seems to be the main limiting factor for in situ reproduction. Growth and reproduction occur simultaneously. The study of the reproductive cycle of one-year old oysters showed that gametogenesis was asynchronous with high interannual variability and growth appeared to take precedence over reproduction. On the...
Tipo: Text
Palavras-chave: Physiologie; Facteurs environnementaux; Cycle; Reproduction; Crassotrea gigas; Huîtres.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/acte-3209.pdf

La reproduction de l'Ormeau Haliotis tuberculata L.
Provedor de dados: 5
Autores: Girard, Annie.
In order to improve the regulation of abalone 'fishing' and to provide for the restocking of supplies, more details of the reproductive cycle were sought. Attention is given to gonad morphology, acquisition of sexual maturity, juvenile hermaphroditism, gonad histogenesis and histology of gametogenesis, annual cycle of gamete emission, and the relation between size and fertility. Results are presented in graphs, histograms, diagrams and photographs. It was found that female reached sexual maturity during the 3rd year, at 38-54 mm, male during year 2 at 25-40 mm; there was successive juvenile hermaphroditism; an active period from mid-June to mid-November was indicated by the volumentric index of maturity; water temperature was associated with the...
Tipo: Text
Palavras-chave: Ormeau; Cycle; Temperature; Haliotis tuberculata L.; Reproduction.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-2062.pdf

A FŐBB SZÁNTÓFÖLDI NÖVÉNYEK TERMELÉSE ÉS AZ ÁLLATÁLLOMÁNY ALAKULÁSÁNAK KILÁTÁSAI
Provedor de dados: 31
Autores: Hegedus-Baranyai,   Nora.
A mindenkori gazdaságpolitikának nagy szüksége van a mezőgazdasági folyamatok összetevőinek megismerésére, a hatások-ellenhatások múltbeli feltérképezésére ahhoz, hogy a jövő agrárstratégiáját már ezek figyelembevételével alakítsa ki. A vizsgálatok a múltbeli tendencia folytatásaként a búza, a kukorica vetésterületének csökkenését, illetve a napraforgó növekedését vetítik előre. A termésmennyiségek prognózisa azt mutatta, hogy a búza, a kukorica és a napraforgó esetében emelkedés várható, amit a hosszú távú ciklusok jövőben várható konjunktúrája még jobban fel fog erősíteni. Az állatállomány trendjének öt éves előrejelzése alapján kirajzolódott az a korántsem pozitív kép, hogy ha a múltbeli tendenciák tovább folytatódnak a sertés- és a...
Tipo: Journal Article
Palavras-chave: Állatállomány; Szántóföldi növénytermelés; Hosszú távú trend; Jövőprognózis; Ciklus; Livestock; Production of arable land plants; Long-term trend; Future prognosis; Cycle; Agribusiness; Crop Production/Industries; Farm Management; Livestock Production/Industries.
Ano: 2007
URL: http://purl.umn.edu/57685

Governing a Common-Pool Resource in a Directed Network
Provedor de dados: 31
Autores: Richefort,   Lionel; Point,   Patrick.
A local public-good game played on directed networks is analyzed. The model is motivated by one-way flows of hydrological influence between cities of a river basin that may shape the level of their contribution to the conservation of wetlands. It is shown that in many (but not all) directed networks, there exists an equilibrium, sometimes socially desirable, in which some stakeholders exert maximal effort and the others free ride. It is also shown that more directed links are not always better. Finally, the model is applied to the conservation of wetlands in the Gironde estuary (France).
Tipo: Working or Discussion Paper
Palavras-chave: Common-pool Resource; Digraph; Cycle; Independent Set; Empirical Example; Environmental Economics and Policy; C72; D85; H41.
Ano: 2010
URL: http://purl.umn.edu/98470

Agronomic characteristics of 'Prata-anã' and 'Maçã' bananas micropropagated
Provedor de dados: 94
Autores: Scandelai,Luís Henrique Mariano; Leonel,Sarita; Apponi,Luciene Michelle.
The experiment evaluated the agronomic characteristics of 'Prata-anã' and 'Maçã' banana plants, in the São Manuel region of São Paulo state. In the first crop cycle, the number of days from planting to inflorescence and from inflorescence to harvest; the number of shoots until the appearance of inflorescence and during the harvest period; active leaves number at inflorescence appearance and during the harvest period. Were evaluated yield parameters: like average weight of bunch, hand, rachis and fruit; average fruit number per hand and bunch; average fruit diameter and length. Incidences of plague diseases, as well as their severity were also evaluated. Delineation was totally at random, with 2 treatments, 15 replications and 5 useful plants per...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Banana; Musa spp; Micropropagation; Cycle.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452006000100041

Selection for bulb maturity in onion
Provedor de dados: 63
Autores: Cardoso,Antonio Ismael Inácio; Costa,Cyro Paulino da.
It is possible to produce onions (Allium cepa) all over the year in Brazil, but most of the Brazilian cultivars have poor quality bulbs, a fact that favours onion imports from Argentina, a producer of Valenciana type cultivars that does not bulb in Brazil, but please Brazilian consumers. To study the effect of selection for bulb maturity, seventeen half sib progenies selected for early maturity and twenty five for late maturity, from the intervarietal triple cross [Crioula x (Pira Ouro x Valenciana Sintetica 14)] were grown, along with the triple cross itself and the cultivars Pira Ouro (short-day), Crioula (intermediate-day) and Armada (long-day). A total of forty six treatments were tested in a randomized block design with three replications of 32 plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Cycle; Bulbification; Breeding.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100009

Use of a GnRH synthetic analog (buserelin) for estrous induction in female dogs
Provedor de dados: 45
Autores: Rezende,R.S.; Eurides,D.; Barbosa,C.P.; Lacerda,M.S.; Sampaio,R.L.; Gomes,A.L.
ABSTRACT The aim of this study was to evaluate the effectiveness of a GnRH synthetic analog, as an estrous inducer in female dogs when administered during the anestrous phase, and to evaluate the pregnancy rate achieved through natural copulation. For this purpose, ten female dogs of different breeds were used. The subjects received buserelin by intramuscular injections at a dose of 2,1mcg when female dogs weighed up to 10kg (Group 1) and of 4,2mcg when the dogs weighed above 10kg (Group 2). Of the ten subjects, only three presented estrus after a single injection of buserelin: two dogs from Group 1 and one dog from Group 2 on average 7±1.29 days. The remaining seven dogs were given a second dose of buserelin, equal to the first administration. Of these,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dogs; Reproduction; Hormone; Cytology; Cycle.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000300656

Analysis of rhythmic variance - ANORVA. A new simple method for detecting rhythms in biological time series
Provedor de dados: 48
Autores: Celec,Peter.
Cyclic variations of variables are ubiquitous in biomedical science. A number of methods for detecting rhythms have been developed, but they are often difficult to interpret. A simple procedure for detecting cyclic variations in biological time series and quantification of their probability is presented here. Analysis of rhythmic variance (ANORVA) is based on the premise that the variance in groups of data from rhythmic variables is low when a time distance of one period exists between the data entries. A detailed stepwise calculation is presented including data entry and preparation, variance calculating, and difference testing. An example for the application of the procedure is provided, and a real dataset of the number of papers published per day in...
Tipo: Journal article
Palavras-chave: Chronobiology; Time series; Method; ANORVA; Analysis of rhythmic variance; Circaseptan; Cycle; Rhyth.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000500007

Phenology and thermal requirements of grapevine cultivars in Dois Vizinhos, Paraná State, Brazil
Provedor de dados: 65
Autores: Mariani,Josiane Aparecida; Nava,Gilmar Antônio; Paulus,Dalva.
ABSTRACT:  This study aimed to characterize the phenology and thermal requirements of grapevine cultivars Bordô, BRS Carmem, BRS Lorena, BRS Magna, BRS Rubea, BRS Violeta, Concord, Concord Clone 30, Isabel, Isabel Precoce, Moscato Bailey, Moscato Embrapa, Niagara Branca, Niagara Rosada, and Seibel 5455 grafted on Paulsen 1103. The study was conducted in the fruit growing sector of the Federal Technological University of Paraná, Câmpus Dois Vizinhos, Paraná State, Brazil, during the cycles of 2015/2016 and 2016/2017. The experimental design was completely randomized, with four replicates and two evaluated plants per plot. Plants were grown in a vertical trellis system and spur pruned with two buds. Evaluations of phenology and thermal requirements were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis labrusca; Hybrids; Cycle; Heat.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000900203