Base de dados : MEDLINE
Pesquisa : I01.240.600.660 [Categoria DeCS]
Referências encontradas : 8541 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 855 ir para página                         

  1 / 8541 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27777048
[Au] Autor:Di Crescenzo A; Spina S
[Ad] Endereço:Dipartimento di Matematica, Università degli Studi di Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy. Electronic address: adicrescenzo@unisa.it.
[Ti] Título:Analysis of a growth model inspired by Gompertz and Korf laws, and an analogous birth-death process.
[So] Source:Math Biosci;282:121-134, 2016 12.
[Is] ISSN:1879-3134
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We propose a new deterministic growth model which captures certain features of both the Gompertz and Korf laws. We investigate its main properties, with special attention to the correction factor, the relative growth rate, the inflection point, the maximum specific growth rate, the lag time and the threshold crossing problem. Some data analytic examples and their performance are also considered. Furthermore, we study a stochastic counterpart of the proposed model, that is a linear time-inhomogeneous birth-death process whose mean behaves as the deterministic one. We obtain the transition probabilities, the moments and the population ultimate extinction probability for this process. We finally treat the special case of a simple birth process, which better mimics the proposed growth model.
[Mh] Termos MeSH primário: Modelos Teóricos
Crescimento Demográfico
[Mh] Termos MeSH secundário: Animais
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1709
[Cu] Atualização por classe:180223
[Lr] Data última revisão:
180223
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161107
[St] Status:MEDLINE


  2 / 8541 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29298310
[Au] Autor:Brasseur SMJM; Reijnders PJH; Cremer J; Meesters E; Kirkwood R; Jensen LF; Jeß A; Galatius A; Teilmann J; Aarts G
[Ad] Endereço:Wageningen Marine Research, Wageningen University & Research, Den Helder, the Netherlands.
[Ti] Título:Echoes from the past: Regional variations in recovery within a harbour seal population.
[So] Source:PLoS One;13(1):e0189674, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Terrestrial and marine wildlife populations have been severely reduced by hunting, fishing and habitat destruction, especially in the last centuries. Although management regulations have led to the recovery of some populations, the underlying processes are not always well understood. This study uses a 40-year time series of counts of harbour seals (Phoca vitulina) in the Wadden Sea to study these processes, and demonstrates the influence of historical regional differences in management regimes on the recovery of this population. While the Wadden Sea is considered one ecologically coupled zone, with a distinct harbour seal population, the area is divided into four geo-political regions i.e. the Netherlands, Lower Saxony including Hamburg, Schleswig-Holstein and Denmark. Gradually, seal hunting was banned between 1962 and 1977 in the different regions. Counts of moulting harbour seals and pup counts, obtained during aerial surveys between 1974 and 2014, show a population growth from approximately 4500 to 39,000 individuals. Population growth models were developed to assess if population growth differed between regions, taking into account two Phocine Distemper Virus (PDV) epizootics, in 1988 and 2002 which seriously affected the population. After a slow start prior to the first epizootic, the overall population grew exponentially at rates close to assumed maximum rates of increase in a harbour seal population. Recently, growth slowed down, potentially indicative of approaching carrying capacity. Regional differences in growth rates were demonstrated, with the highest recovery in Netherlands after the first PDV epizootic (i.e. 17.9%), suggesting that growth was fuelled by migration from the other regions, where growth remained at or below the intrinsic growth rate (13%). The seals' distribution changed, and although the proportion of seals counted in the German regions declined, they remained by far the most important pupping region, with approximately 70% of all pups being born there. It is hypothesised that differences in hunting regime, preceding the protection in the 1960's and 1970's, created unbalance in the distribution of breeding females throughout the Wadden Sea, which prevailed for decades. Breeding site fidelity promoted the growth in pup numbers at less affected breeding sites, while recolonisation of new breeding areas would be suppressed by the philopatry displayed by the animals born there. This study shows that for long-lived species, variable management regimes in this case hunting regulations, across a species' range can drive population dynamics for several generations.
[Mh] Termos MeSH primário: Phoca/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Animais
Dinamarca
Cinomose/virologia
Vírus da Cinomose Focina/patogenicidade
Países Baixos
Crescimento Demográfico
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180210
[Lr] Data última revisão:
180210
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180104
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189674


  3 / 8541 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29065173
[Au] Autor:T Alkahtani BS; Atangana A; Koca I
[Ad] Endereço:Department of Mathematical, Colle of Science, King Saud University, P.O.Box 1142, Riyadh, 11989, Saudi Arabia.
[Ti] Título:New nonlinear model of population growth.
[So] Source:PLoS One;12(10):e0184728, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The model of population growth is revised in this paper. A new model is proposed based on the concept of fractional differentiation that uses the generalized Mittag-Leffler function as kernel of differentiation. The new model includes the choice of sexuality. The existence of unique solution is investigated and numerical solution is provided.
[Mh] Termos MeSH primário: Modelos Teóricos
Crescimento Demográfico
[Mh] Termos MeSH secundário: Animais
Feminino
Seres Humanos
Masculino
Sexualidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171113
[Lr] Data última revisão:
171113
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171025
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0184728


  4 / 8541 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28977564
[Au] Autor:Yu D; Jordan KP; Bedson J; Englund M; Blyth F; Turkiewicz A; Prieto-Alhambra D; Peat G
[Ad] Endereço:Research Institute for Primary Care & Health Sciences, Keele University, Keele, UK.
[Ti] Título:Population trends in the incidence and initial management of osteoarthritis: age-period-cohort analysis of the Clinical Practice Research Datalink, 1992-2013.
[So] Source:Rheumatology (Oxford);56(11):1902-1917, 2017 Nov 01.
[Is] ISSN:1462-0332
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Objective: To determine recent trends in the rate and management of new cases of OA presenting to primary healthcare using UK nationally representative data. Methods: Using the Clinical Practice Research Datalink we identified new cases of diagnosed OA and clinical OA (including OA-relevant peripheral joint pain in those aged over 45 years) using established code lists. For both definitions we estimated annual incidence density using exact person-time, and undertook descriptive analysis and age-period-cohort modelling. Demographic characteristics and management were described for incident cases in each calendar year. Sensitivity analyses explored the robustness of the findings to key assumptions. Results: Between 1992 and 2013 the annual age-sex standardized incidence rate for clinical OA increased from 29.2 to 40.5/1000 person-years. After controlling for period effects, the consultation incidence of clinical OA was higher for successive cohorts born after the mid-1950s, particularly women. In contrast, with the exception of hand OA, we observed no increase in the incidence of diagnosed OA: 8.6/1000 person-years in 2004 down to 6.3 in 2013. In 2013, 16.4% of clinical OA cases had an X-ray referral. While NSAID prescriptions fell from 2004, the proportion prescribed opioid analgesia rose markedly (0.1% of diagnosed OA in 1992 to 1.9% in 2013). Conclusion: Rising rates of clinical OA, continued use of plain radiography and a shift towards opioid analgesic prescription are concerning. Our findings support the search for policies to tackle this common problem that promote joint pain prevention while avoiding excessive and inappropriate health care.
[Mh] Termos MeSH primário: Analgésicos Opioides/uso terapêutico
Anti-Inflamatórios não Esteroides/uso terapêutico
Osteoartrite/epidemiologia
Atenção Primária à Saúde
[Mh] Termos MeSH secundário: Distribuição por Idade
Idoso
Idoso de 80 Anos ou mais
Estudos de Coortes
Bases de Dados Factuais
Feminino
Seres Humanos
Incidência
Masculino
Meia-Idade
Osteoartrite/diagnóstico por imagem
Osteoartrite/tratamento farmacológico
Crescimento Demográfico
Radiografia
Distribuição por Sexo
Reino Unido/epidemiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Analgesics, Opioid); 0 (Anti-Inflammatory Agents, Non-Steroidal)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:171005
[St] Status:MEDLINE
[do] DOI:10.1093/rheumatology/kex270


  5 / 8541 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28854737
[Au] Autor:Nagamalleswari E; Rao S; Vasu K; Nagaraja V
[Ad] Endereço:Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore 560012, India.
[Ti] Título:Restriction endonuclease triggered bacterial apoptosis as a mechanism for long time survival.
[So] Source:Nucleic Acids Res;45(14):8423-8434, 2017 Aug 21.
[Is] ISSN:1362-4962
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Programmed cell death (PCD) under certain conditions is one of the features of bacterial altruism. Given the bacterial diversity and varied life style, different PCD mechanisms must be operational that remain largely unexplored. We describe restriction endonuclease (REase) mediated cell death by an apoptotic pathway, beneficial for isogenic bacterial communities. Cell death is pronounced in stationary phase and when the enzyme exhibits promiscuous DNA cleavage activity. We have elucidated the molecular mechanism of REase mediated cell killing and demonstrate that released nutrients from dying cells support the growth of the remaining cells in the population. These findings illustrate a new intracellular moonlighting role for REases which are otherwise established host defence arsenals. REase induced PCD appears to be a cellular design to replenish nutrients for cells undergoing starvation stress and the phenomenon could be wide spread in bacteria, given the abundance of restriction-modification (R-M) systems in the microbial population.
[Mh] Termos MeSH primário: Apoptose
Proteínas de Bactérias/metabolismo
Enzimas de Restrição do DNA/metabolismo
Escherichia coli/enzimologia
[Mh] Termos MeSH secundário: Adaptação Fisiológica
Proteínas de Bactérias/genética
Western Blotting
Morte Celular
Enzimas de Restrição do DNA/genética
Enzimas de Restrição-Modificação do DNA/genética
Enzimas de Restrição-Modificação do DNA/metabolismo
Escherichia coli/citologia
Escherichia coli/genética
Regulação Bacteriana da Expressão Gênica
Viabilidade Microbiana
Microscopia Confocal
Densidade Demográfica
Crescimento Demográfico
Reação em Cadeia da Polimerase Via Transcriptase Reversa
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bacterial Proteins); 0 (DNA Restriction-Modification Enzymes); EC 3.1.21.- (DNA Restriction Enzymes)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170901
[St] Status:MEDLINE
[do] DOI:10.1093/nar/gkx576


  6 / 8541 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28854662
[Au] Autor:Atlihan R; Kasap I; Özgökçe MS; Polat-Akköprü E; Chi H
[Ad] Endereço:Department of Plant Protection, Faculty of Agriculture, University of Yuzuncu Yil, 65080 Van, Turkey.
[Ti] Título:Population Growth of Dysaphis pyri (Hemiptera: Aphididae) on Different Pear Cultivars With Discussion on Curve Fitting in Life Table Studies.
[So] Source:J Econ Entomol;110(4):1890-1898, 2017 Aug 01.
[Is] ISSN:1938-291X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Population growth parameters of the Dysaphis pyri (Boyer de Fonscolombe) (Hemiptera: Aphididae) were evaluated on four different cultivars (Coscia, Ankara, Williams, and Santa-Maria) of pear (Pyrus communis L.) under field conditions in the Van region of Turkey. Aphids were kept on leaves of 10-yr-old pear trees in Plexiglas clip-cells (20 mm in diameter and 10 mm in height, with the upper side covered with muslin). For the description of the stage differentiation during population growth, we analyzed raw data of developmental time, survival, and fecundity using the age-stage, two-sex life table to take the variable developmental rate among individuals into account. Results indicated that the Coscia and Ankara cultivars are less favorable hosts for D. pyri because of the longer preadult developmental time, higher preadult mortality rate, and lower total fecundity on these cultivars. The intrinsic rate of increase (r), the net reproduction rate (R0), and the finite rate of increase (λ) values were lower on the Coscia and Ankara cultivars. We discussed the application of the Weibull function, polynomial model, and Enkegaard model in life table studies. Because these models are often inaccurate in describing survival and reproduction parameters, we suggest that their application in life table research should be reevaluated.
[Mh] Termos MeSH primário: Afídeos/fisiologia
Cadeia Alimentar
Pyrus
[Mh] Termos MeSH secundário: Animais
Afídeos/crescimento & desenvolvimento
Feminino
Fertilidade
Tábuas de Vida
Longevidade
Masculino
Ninfa/crescimento & desenvolvimento
Ninfa/fisiologia
Crescimento Demográfico
Pyrus/genética
Pyrus/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170901
[St] Status:MEDLINE
[do] DOI:10.1093/jee/tox174


  7 / 8541 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28684490
[Au] Autor:Lee DH
[Ad] Endereço:Department of Physics, University of California, Berkeley, CA 94720, USA. dunghai@berkeley.edu.
[Ti] Título:Hunting down unconventional superconductors.
[So] Source:Science;357(6346):32-33, 2017 07 07.
[Is] ISSN:1095-9203
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Crescimento Demográfico
Supercondutividade
[Mh] Termos MeSH secundário: Conservação dos Recursos Naturais
Europa (Continente)
[Pt] Tipo de publicação:JOURNAL ARTICLE; COMMENT
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170708
[St] Status:MEDLINE
[do] DOI:10.1126/science.aan2657


  8 / 8541 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28662095
[Au] Autor:Wasser SK; Lundin JI; Ayres K; Seely E; Giles D; Balcomb K; Hempelmann J; Parsons K; Booth R
[Ad] Endereço:Center for Conservation Biology, Department of Biology, University of Washington, Seattle, WA, United States of America.
[Ti] Título:Population growth is limited by nutritional impacts on pregnancy success in endangered Southern Resident killer whales (Orcinus orca).
[So] Source:PLoS One;12(6):e0179824, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The Southern Resident killer whale population (Orcinus orca) was listed as endangered in 2005 and shows little sign of recovery. These fish eating whales feed primarily on endangered Chinook salmon. Population growth is constrained by low offspring production for the number of reproductive females in the population. Lack of prey, increased toxins and vessel disturbance have been listed as potential causes of the whale's decline, but partitioning these pressures has been difficult. We validated and applied temporal measures of progesterone and testosterone metabolites to assess occurrence, stage and health of pregnancy from genotyped killer whale feces collected using detection dogs. Thyroid and glucocorticoid hormone metabolites were measured from these same samples to assess physiological stress. These methods enabled us to assess pregnancy occurrence and failure as well as how pregnancy success was temporally impacted by nutritional and other stressors, between 2008 and 2014. Up to 69% of all detectable pregnancies were unsuccessful; of these, up to 33% failed relatively late in gestation or immediately post-partum, when the cost is especially high. Low availability of Chinook salmon appears to be an important stressor among these fish-eating whales as well as a significant cause of late pregnancy failure, including unobserved perinatal loss. However, release of lipophilic toxicants during fat metabolism in the nutritionally deprived animals may also provide a contributor to these cumulative effects. Results point to the importance of promoting Chinook salmon recovery to enhance population growth of Southern Resident killer whales. The physiological measures used in this study can also be used to monitor the success of actions aimed at promoting adaptive management of this important apex predator to the Pacific Northwest.
[Mh] Termos MeSH primário: Espécies em Perigo de Extinção
Estado Nutricional
Orca/fisiologia
[Mh] Termos MeSH secundário: Animais
Feminino
Crescimento Demográfico
Gravidez
Reprodução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170928
[Lr] Data última revisão:
170928
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170630
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0179824


  9 / 8541 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28593965
[Au] Autor:Nathans J
[Ad] Endereço:Johns Hopkins Medical School, Baltimore, USA.
[Ti] Título:Population growth: Help to make food go further in Egypt.
[So] Source:Nature;546(7657):210, 2017 06 07.
[Is] ISSN:1476-4687
[Cp] País de publicação:England
[La] Idioma:eng
[Mh] Termos MeSH primário: Demografia
Crescimento Demográfico
[Mh] Termos MeSH secundário: África
África do Norte
Países em Desenvolvimento
Egito
Alimentos
Dinâmica Populacional
[Pt] Tipo de publicação:LETTER; COMMENT
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170928
[Lr] Data última revisão:
170928
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170609
[St] Status:MEDLINE
[do] DOI:10.1038/546210e


  10 / 8541 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28528414
[Au] Autor:Gundersen DT; Zeug SC; Bringolf RB; Merz J; Jackson Z; Webb MAH
[Ad] Endereço:Environmental Science Program, Pacific University, Forest Grove, OR, USA.
[Ti] Título:Tissue Contaminant Burdens in San Francisco Estuary White Sturgeon (Acipenser transmontanus): Implications for Population Recovery.
[So] Source:Arch Environ Contam Toxicol;73(2):334-347, 2017 Aug.
[Is] ISSN:1432-0703
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The San Francisco Estuary (SFE) is heavily influenced by anthropogenic activities, including historic and chronic contaminant inputs. These contaminants can adversely affect SFE fish populations, particularly white sturgeon, because they are a benthic dwelling, long-lived species. We measured a suite of metals and organic contaminants in liver and gonad tissues of 25 male and 32 female white sturgeon as well as several physiological indicators of sturgeon health. Most sturgeon (68% of males and 83% of females) were estimated to be between 13 and 17 years of age. Sturgeon tissues had elevated concentrations of several metals, including As, Ba, Cd, Cu, Cr, Pb, Hg, Ni, Se, and Zn. The most frequently detected organic contaminants in sturgeon livers and gonads were DDE, PCBs, PBDEs, and galaxolide. Selenium was detected at levels similar to those shown to cause impaired liver physiology and reproductive success in white sturgeon. Observed Hg levels were higher than those shown to result in lower condition factor and gonadosomatic indices in white sturgeon. Liver galaxolide levels correlated with decreased plasma estradiol levels in female sturgeon. The Cd, As, and Cu warrant further investigation, because they were detected at levels known to impair fish health. Our results suggest contaminants are negatively affecting SFE white sturgeon health and fitness. Future SFE white sturgeon contaminant research is suggested.
[Mh] Termos MeSH primário: Monitoramento Ambiental/métodos
Estuários
Peixes/metabolismo
Poluentes Químicos da Água/metabolismo
[Mh] Termos MeSH secundário: Animais
Feminino
Masculino
Mercúrio/metabolismo
Bifenilos Policlorados/metabolismo
Crescimento Demográfico
Reprodução
São Francisco
Selênio/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Chemical); DFC2HB4I0K (Polychlorinated Biphenyls); FXS1BY2PGL (Mercury); H6241UJ22B (Selenium)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170816
[Lr] Data última revisão:
170816
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170522
[St] Status:MEDLINE
[do] DOI:10.1007/s00244-017-0378-9



página 1 de 855 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde