Results 121 to 130 of about 442,368 (316)

The Kullback–Leibler Divergence and the Convergence Rate of Fast Covariance Matrix Estimators in Galaxy Clustering Analysis

The Astrophysical Journal
We present a method to quantify the convergence rate of the fast estimators of the covariance matrices in the large-scale structure analysis. Our method is based on the Kullback–Leibler (KL) divergence, which describes the relative entropy of two ...
Zhigang Li, Zhejie Ding, Yu Yu, Pengjie Zhang   +3 more
doaj   +1 more source

Testing the cosmological principle with quasars

Astronomy & Astrophysics
The cosmological principle posits that the universe is homogeneous and isotropic on the large scales. In history, the cosmological principle was confirmed by various cosmological observations from CMB to large scale structure.
Chen Shuangnan, Yang Xiaofeng, Ren Yunliang, Zhang Xuwei, Shi Yangjun, Cheng Cheng, He Xiaolong, Guo Sufen   +7 more
doaj   +1 more source

Derivation and characterization of retinal pigment epithelium from urine‐derived iPSCs

FEBS Open Bio, EarlyView.
Age‐related macular degeneration causes vision loss via RPE dysfunction and loss. Traditional iPSC therapies rely on invasive biopsies, limiting scalability. Here, we utilize urine‐derived stem cells as an accessible source to generate u‐iPSCs, successfully differentiated into pigmented RPE. This “Urine‐to‐Retina” platform provides a promising path for
Daniella Beiner, Hainan Zhu, Carol Christine Bosholm, Heuy‐Ching Wang, Tracy Criswell, Anthony Atala, Jian‐Xing Ma, Yuanyuan Zhang   +7 more
wiley   +1 more source

Simulated rotation measure sky from primordial magnetic fields

Astronomy & Astrophysics
Primordial magnetic fields (PMFs) – magnetic fields that originate in the early Universe and permeate the cosmological scales today – can explain the observed micro-gauss-level magnetisation of galaxies and their clusters.
Mtchedlidze S., Vazza F., Du X., Carretti E., Stuardi C., O’Sullivan S. P.   +5 more
doaj   +1 more source

The large scale structure of the universe

Nuclear Physics B, 1985
Abstract Observational data on galaxies and clusters of galaxies are reviewed in the context of how they relate to the large scale structure of the Universe. Various methods of interpreting these data are discussed.
openaire   +1 more source

RoundMi: A quantitative method to analyze mitochondrial morphology in mitotic cells

FEBS Open Bio, EarlyView.
RoundMi is a workflow for rapid analysis of mitochondrial morphology in mitotic cells. By combining adaptive preprocessing with automated segmentation and quantification, it enables accurate measurements from single focal plane images, reducing acquisition time and computational demands while remaining compatible with high‐throughput fixed and live ...
Elmira Parvindokht Bararpour, Christine Volmert, Valentina Piano   +2 more
wiley   +1 more source

General Relativity and the Bulk-flow Puzzle

The Astrophysical Journal
Bulk peculiar flows are commonplace in the Universe, with many surveys reporting their presence on scales spanning between few hundred and several hundred Mpc.
Christos G. Tsagas
doaj   +1 more source

Risk Prediction Models for Recurrence After Curative Treatment of Early‐Stage or Locally Advanced Lung Cancer: A Systematic Review

Aging and Cancer, EarlyView.
This systematic review synthesizes prognostic models for survival and recurrence in resected non‐small cell lung cancer. While many models demonstrate moderate to good discrimination, few are externally validated and reporting quality is variable, limiting clinical applicability and highlighting the need for robust, transparent model development ...
Evangeline Samuel, S. Tissera, E. Paul, J. Zalcberg, R. G. Stirling   +4 more
wiley   +1 more source

Cosmological Observations in a Modified Theory of Gravity (MOG)

Galaxies, 2013
Our Modified Gravity Theory (MOG) is a gravitational theory without exotic dark matter, based on an action principle. MOG has been used successfully tomodel astrophysical phenomena, such as galaxy rotation curves, galaxy cluster masses and lensing.
John. W. Moffat, Viktor T. Toth
doaj   +1 more source

Could the electroweak scale be linked to the large scale structure of the Universe? [PDF]

We study a model where the domain walls are generated through a cosmological phase transition involving a scalar field. We assume the existence of a coupling between the scalar field and dark matter and show that the interaction between domain walls and ...
Chakravorty, Alak, Massarotti, Alessandro   +1 more
core   +1 more source