Chen, G. et al. A learning deficit related to age and β-amyloid plaques in a mouse model of Alzheimer's disease. Nature 408, 975–979 (2000)

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

Hsiao, K. et al. Correlative memory deficits, Aβ elevation, and amyloid plaques in transgenic mice. Science 274, 99–102 (1996)

Kayed, R. et al. Common structure of soluble amyloid oligomers implies common mechanism of pathogenesis. Science 300, 486–489 (2003)

Haass, C., Koo, E. H., Mellon, A., Hung, A. Y. & Selkoe, D. J. Targeting of cell-surface β-amyloid precursor protein to lysosomes: alternative processing into amyloid-bearing fragments. Nature 357, 500–503 (1992)

Barelli, H. et al. Characterization of new polyclonal antibodies specific for 40 and 42 amino acid-long amyloid β peptides: their use to examine the cell biology of presenilins and the immunohistochemistry of sporadic Alzheimer's disease and cerebral amyloid angiopathy cases. Mol. Med. 3, 695–707 (1997)

Benzing, W. C. et al. Evidence for glial-mediated inflammation in aged APPSW transgenic mice. Neurobiol. Aging 20, 581–589 (1999)

Kawas, C. H. et al. Visual memory predicts Alzheimer's disease more than a decade before diagnosis. Neurology 60, 1089–1093 (2003)

Working with water pumps involves electrical and mechanical components, so it's important to follow safety precautions. These may include wearing protective gear, disconnecting power before maintenance, and following manufacturer instructions.

This article has been retracted. Please see the Retraction Notice for more detail: https://doi.org/10.1038/s41586-024-07691-8

This file contains the Supplementary Methods, Supplementary Discussion (on the selective effects of Aβ*56 on retention, but not acquisition of spatial memory) Supplementary Table 1, Supplementary Figures 1–7 and additional references. (PDF 2010 kb)

Small, G. W. et al. Cerebral metabolic and cognitive decline in persons at genetic risk for Alzheimer's disease. Proc. Natl Acad. Sci. USA 97, 6037–6042 (2000)

SantaCruz, K. et al. Tau suppression in a neurodegenerative mouse model improves memory function. Science 309, 476–481 (2005)

Water pumps typically consist of several common parts, including impellers, casings, seals, motors, and control panels. These components work together to efficiently circulate and control the water flow.

Water pumps are essential for various applications, from plumbing systems to home improvement projects. To ensure their proper functioning and longevity, it's crucial to have the right parts and accessories. In this guide, we will cover everything you need to know about water pumps parts and accessories.

Hsia, A. Y. et al. Plaque-independent disruption of neural circuits in Alzheimer's disease mouse models. Proc. Natl Acad. Sci. USA 96, 3228–3233 (1999)

The frequency of part replacement depends on various factors, such as the pump usage, maintenance practices, and overall lifespan of the components. It's recommended to inspect the condition of the parts regularly and replace them as needed.

Selecting the appropriate parts and accessories for your water pump can be overwhelming with the multitude of options available. In this section, we will provide practical tips and considerations to help you make the best choices.

Janus, C. et al. Aβ peptide immunization reduces behavioural impairment and plaques in a model of Alzheimer's disease. Nature 408, 979–982 (2000)

While the specific accessories may vary depending on the pump type and application, some common accessories required for water pump installation include check valves, pressure tanks, discharge fittings, and pipe connectors.

We thank S. Younkin, D. Walsh, M. Podlisny, D. Selkoe, J. Cleary and S. Prusiner for critical discussions. We are grateful to D. Cooper-Blacketer, J. McQuail and M. Sherman for technical help, and A. Delacourte and N. Sergeant for providing the APPC17-Cter antiserum. This work was supported by grants from the NIH (to K.H.A., M.G. and A.Y.) and a gift from M. and H. Hobbs to M.G. Author Contributions S.L. and K.H.A. conceived the project. S.L. planned, performed and analysed the biochemistry experiments, including the protein extractions and purification of Aβ*56. K.H.A. wrote most of the paper. M.T.K. and M.G. planned, performed and analysed the rat behavioural experiments, and L.K. planned and analysed the mouse behavioural experiments. A.Y. provided the mass spectrometry analysis of purified Aβ*56, C.G.G. provided biochemistry advice, and C.G.G. and R.K. donated the A11 antiserum.

Westerman, M. A. et al. The relationship between Aβ and memory in the Tg2576 mouse model of Alzheimer's disease. J. Neurosci. 22, 1858–1867 (2002)

Walsh, D. M. et al. Naturally secreted oligomers of amyloid β protein potently inhibit hippocampal long-term potentiation in vivo. Nature 416, 535–539 (2002)

Gallagher, M., Burwell, R. & Burchinal, M. Severity of spatial learning impairment in aging: development of a learning index for performance in the Morris water maze. Behav. Neurosci. 107, 618–626 (1993)

Craik, F. I. in Handbook of the Psychology of Aging (eds Birren, J. E. & Schall, K.) 384–420 (Van Nostrand-Reinhold, New York, 1977)

Several top-rated brands specialize in manufacturing high-quality water pump parts and accessories. Some renowned brands in this category include XYZ Pumps, ABC Accessories, and DEF Parts. These brands are known for their reliability and performance.

Poor memory function has been noted in individuals that developed Alzheimer's disease up to 15 years before the eventual diagnosis of the condition. Experiments in a mouse model for the disease have now tracked down a possible cause for this early symptom: the extracellular accumulation of a soluble amyloid-β peptide assembly, dubbed Aβ*. When Aβ* is isolated from these mice and injected into rats, the rats also experience temporary memory deterioration independent of plaque formation or neuronal loss, the classic hallmarks of Alzheimer's. This work points to Aβ* as a potential diagnostic, and raises the possibility that by targeting it early it may be possible to prevent or delay the permanent changes characteristic of the later stages of the disease.

Lesné, S., Koh, M., Kotilinek, L. et al. RETRACTED ARTICLE: A specific amyloid-β protein assembly in the brain impairs memory. Nature 440, 352–357 (2006). https://doi.org/10.1038/nature04533

Gordon, J. A. & Warren, J. R. Denaturation of globular proteins. I. The interaction of urea and thiourea with bovine plasma albumin. J. Biol. Chem. 243, 5663–5669 (1968)

Irizarry, M. C., McNamara, M., Fedorchak, K., Hsiao, K. & Hyman, B. T. APPSW transgenic mice develop age-related Aβ deposits and neuropil abnormalities, but no neuronal loss in CA1. J. Neuropathol. Exp. Neurol. 56, 965–973 (1997)

In this section, we will explore the top parts and accessories you should consider for your water pump. These components play a crucial role in ensuring optimal performance and minimizing the risk of breakdowns.

When it comes to water pumps parts and accessories, it's essential to choose reliable and reputable brands. We have curated a list of quality brands that are known for their durability and performance.

Klein, W. L., Krafft, G. A. & Finch, C. E. Targeting small Aβ oligomers: the solution to an Alzheimer's disease conundrum? Trends Neurosci. 24, 219–224 (2001)

Stern, E. A. et al. Cortical synaptic integration in vivo is disrupted by amyloid-β plaques. J. Neurosci. 24, 4535–4540 (2004)

Bookheimer, S. Y. et al. Patterns of brain activation in people at risk for Alzheimer's disease. N. Engl. J. Med. 343, 450–456 (2000)

Editor’s Note: The editors of Nature have been alerted to concerns regarding some of the figures in this paper. Nature is investigating these concerns, and a further editorial response will follow as soon as possible. In the meantime, readers are advised to use caution when using results reported therein.

Regular maintenance is crucial for the proper functioning of water pumps. Some essential maintenance tips include checking for leaks, cleaning the pump and components, lubricating moving parts, and inspecting electrical connections.

Maintaining your water pump is essential for its longevity and efficient operation. Learn about the importance of regular maintenance and the key areas you should focus on to keep your water pump running smoothly.

Kawarabayashi, T. et al. Age-dependent changes in brain, CSF, and plasma amyloid β protein in the Tg2576 transgenic mouse model of Alzheimer's disease. J. Neurosci. 21, 372–381 (2001)

Sergeant, N. et al. Progressive decrease of amyloid precursor protein carboxy terminal fragments (APP-CTFs), associated with tau pathology stages, in Alzheimer's disease. J. Neurochem. 81, 663–672 (2002)

Using aftermarket parts for your water pump can be a cost-effective option. However, it's crucial to ensure that the aftermarket parts are compatible and of high quality to avoid any potential performance issues.

Memory function often declines with age1, and is believed to deteriorate initially because of changes in synaptic function rather than loss of neurons2. Some individuals then go on to develop Alzheimer's disease with neurodegeneration. Here we use Tg2576 mice, which express a human amyloid-β precursor protein (APP) variant linked to Alzheimer's disease, to investigate the cause of memory decline in the absence of neurodegeneration or amyloid-β protein amyloidosis. Young Tg2576 mice (< 6 months old) have normal memory and lack neuropathology, middle-aged mice (6–14 months old) develop memory deficits without neuronal loss, and old mice (> 14 months old) form abundant neuritic plaques containing amyloid-β (refs 3–6). We found that memory deficits in middle-aged Tg2576 mice are caused by the extracellular accumulation of a 56-kDa soluble amyloid-β assembly, which we term Aβ*56 (Aβ star 56). Aβ*56 purified from the brains of impaired Tg2576 mice disrupts memory when administered to young rats. We propose that Aβ*56 impairs memory independently of plaques or neuronal loss, and may contribute to cognitive deficits associated with Alzheimer's disease.

Before diving into the details of parts and accessories, let's briefly discuss the various types of water pumps available in the market. This understanding will help you choose the right parts and accessories for your specific pump type.

Yes, different water pump brands may have specific parts and accessories designed to fit their models perfectly. It's important to check the compatibility and specifications provided by the manufacturer when purchasing parts and accessories.

Billings, L. M., Oddo, S., Green, K. N., McGaugh, J. L. & Laferla, F. M. Intraneuronal Aβ causes the onset of early Alzheimer's disease-related cognitive deficits in transgenic mice. Neuron 45, 675–688 (2005)