Results 61 to 70 of about 141,394 (267)

When Does Alzheimer's Disease Start? Plasma Aβ42/40 Assays Show Steep Changes at Aβ‐PET Centiloid 15, Mean Age of 66 Years

Annals of Neurology, EarlyView.
Objective Sporadic late‐onset Alzheimer's disease (AD) is characterized by a long pre‐clinical phase where amyloid‐beta (Aβ) and tau begin to accumulate in the brain. The primary objective was to determine the age at which AD starts by finding the average population age when both positron emission tomography (PET) Aβ (Aβ‐PET) and plasma Aβ42/40 become ...
Rodrigo Cánovas, Timothy Cox, Vincent Doré, Pierrick Bourgeat, Jurgen Fripp, Azadeh Feizpour, Rosita Shishegar, Christopher J. Fowler, Simon M. Laws, Tenielle Porter, Stephanie Rainey‐Smith, Leslie M. Shaw, Randall J. Bateman, Yan Li, Ovod Vitaliy, Michael W. Weiner, John C. Morris, Tammie L.S. Benzinger, Suzanne E. Schindler, Akinori Nakamura, Takeshi Iwatsubo, Takeshi Ikeuchi, Takashi Kato, Paul Maruff, Hamid R. Sohrabi, Christopher C. Rowe, Ralph N. Martins, Colin L. Masters, James D. Doecke, for the Alzheimer's Disease Neuroimaging Initiative   +29 more
wiley   +1 more source

Mitochondrial Dna Replacement Versus Nuclear Dna Persistence

, 2006
In this paper we consider two populations whose generations are not overlapping and whose size is large. The number of males and females in both populations is constant.
Cann R L, Kingman J F C, Maurizio Serva, Serva M, Serva M, Simon D, Thorne A G   +6 more
core   +1 more source

Occurrence of LINE, gypsy-like, and copia-like retrotransposons in the clonally propagated sweet potato (Ipomoea batatas L.) [PDF]

, 2011
Retrotransposons are a class of transposable elements that represent a major fraction of the repetitive DNA of most eukaryotes. Their abundance stems from their expansive replication strategies.
Dieters, Mark, Godwin, Ian, Harding, Rob, Okpul, Tom   +3 more
core   +2 more sources

Early evolutionary history of the seed

Biological Reviews, EarlyView.
ABSTRACT The seed is an essential stage in the life history of gymnospermous and angiospermous plants, facilitating both their survival and dispersal. We reappraise knowledge of the evolutionary history of the gymnospermous seed, from its origin in the late Devonian through to the well‐known end‐Permian extinctions – an interval encompassing the ...
Richard M. Bateman, Alan R. T. Spencer, Jason Hilton   +2 more
wiley   +1 more source

In Vitro Regeneration of Chrysanthemum from Ovaries and Ovules Treated with Thermal and Chemical Stimuli: Morphogenic and Cytogenetic Effects

Agriculture, 2023
Chrysanthemum (Chrysanthemum × morifolium (Ramat.) Hemsl.) holds a prominent position in the market of ornamental plants. To further advance chrysanthemum breeding efforts, the development of haploids may be useful.
Natalia Miler, Alicja Tymoszuk, Monika Rewers, Dariusz Kulus   +3 more
doaj   +1 more source

The power of many: when genetics met yeasts and high‐throughput

Biological Reviews, EarlyView.
ABSTRACT In recent years, complex technological capabilities have evolved, driven by the need to solve complex and integrative biological questions through global analyses. New equipment allows the scaling up and automation of processes which previously were carried out on a very limited scale.
Víctor A. Tallada, Víctor Carranco
wiley   +1 more source

Cultivating Callus from Anthers and Regenerating Haploid Plants in Lilium longiflorum

Horticulturae
In vitro anther culture is a technique used to produce haploid plants when regenerating varieties with specific traits. To generate haploid plants with preferred characteristics, an anther culture technique was established for Lilium longiflorum “Show Up”
Yingyang Li, Yufan Li, Xuanke Dong, Yanfang Cai, Jiren Chen, Rong Liu, Fan Zhu   +6 more
doaj   +1 more source

Shoots formation from gynosinesis Cucumis sativus l.

Ho Chi Minh City Open University Journal of Science - Engineering and Technology, 2018
Haploid plants achieve through androgenesis or gynogenesis. In gynogenesis method, the ovary or ovule are used as explants induct haploid plants. Female flower one day before flowering of Cucumis sativus L. are collected.
Le Thi Kim Ngoc, Nguyen Tran Dong Phuong
doaj   +1 more source

Asexual and sexual replication in sporulating organisms

, 2006
This paper develops models describing asexual and sexual replication in sporulating organisms. Replication via sporulation is the replication strategy for all multicellular life, and may even be observed in unicellular life (such as with budding yeast ...
Bohyun Lee, C. O. Wilke, C. S. Potten, D. B. Dusenbery, Emmanuel Tannenbaum, G. Bell, G. C. Williams, H. J. Muller, J. Felsenstein, J. Haigh, J. Maynard-Smith, J. R. Merok, K. Negishi, L. Kelly, P. Schuster, R. E. Michod, W. Ebeling   +16 more
core   +1 more source

Strategies for the evolution of sex [PDF]

, 2001
We find that the hypothesis made by Jan, Stauffer and Moseley [Theory in Biosc., 119, 166 (2000)] for the evolution of sex, namely a strategy devised to escape extinction due to too many deleterious mutations, is sufficient but not necessary for the ...
A. Bernardes, A. Kondrashov, A. Pekalski, Ayşe Erzan, B. Chopard, B. Drossel, B. Örcal, C. Chisholm, D. Stauffer, D. Stauffer, E.J. Lyons, E.P. Solomon, Erkan Tüzel, H.L. Muller, J. Maynard Smith, J. Maynard Smith, J. Maynard Smith, J. Thoms, J.M. Smith, J.S. SaMartins, L.M. Prescott, M. Eigen, N. Jan, R.J. Redfield, S.S. Mader, T.J. Penna, Volkan Sevim, W.D. Hamilton, Y. Cui   +28 more
core   +2 more sources