Results 41 to 50 of about 1,312,310 (317)

Epigenetic blind spots – the role of DNA methylation dynamics in stem cell‐based models of embryogenesis

open access: yesFEBS Letters, EarlyView.
Embryo‐like structures (stembryos) are an innovative tool, but they are hindered by experimental variability and limited developmental potential. DNA methylation is crucial for mammalian development, but its status in stembryo models is poorly characterized.
Sara Canil   +4 more
wiley   +1 more source

Spontaneous resolution of atrial and ventricular septal defects in Malta [PDF]

open access: yes, 1998
Congenital heart disease (CHD) is the commonest congenital malformation, and ventricular septal defect (VSD) and atrial septal defect (ASD) are the commonest forms of CHD.
Bailey, Mark   +2 more
core  

Spontaneous Hemopneumothorax: An Overlooked Life-Threatening Condition

open access: yes, 2009
Spontaneous hemopneumothorax is a rare clinical entity. A large spontaneous hemopneumothorax is life-threatening, and mortality increases with delayed recognition and intervention.
江文莒;陳文鍾;賴婷怡;袁昂   +1 more
core   +1 more source

Spontaneous Pneumomediastinum: A Rare Cause of Chest Pain [PDF]

open access: yes, 2023
Spontaneous pneumomediastinum is a rare medical condition characterized by the presence of free air in the mediastinum, not preceded by trauma, surgery, or another medical procedure.
Pimenta Fernandes, João   +7 more
core   +1 more source

Spontaneous neurotransmitter release and Ca2+—How spontaneous is spontaneous neurotransmitter release?

open access: yesCell Calcium, 2008
Neurotransmitter release from neurons takes place at specialized structures called synapses. Action potential-evoked exocytosis requires Ca(2+) influx through voltage-gated Ca(2+) channels. Spontaneous vesicle fusion occurs both in the absence of action potentials and without any apparent stimulus and is hence thought to be Ca(2+)-independent. However,
openaire   +2 more sources

Residual tail twisting in ascidian larvae is stabilized by asymmetric myofibrils that resist bilateral symmetry restoration

open access: yesFEBS Letters, EarlyView.
Ascidian Ciona larvae initially show strong clockwise tail twisting, which is largely corrected during development. However, a small residual twist remains. This study shows that organized helical myofibrils in tail muscles mechanically stabilize this residual asymmetry, preventing complete restoration of bilateral symmetry and revealing how embryos ...
Yuki S. Kogure   +3 more
wiley   +1 more source

Tunisian Silybum Species: Important Sources of Polyphenols, Organic Acids, Minerals, and Proteins across Various Plant Organs

open access: yesPlants
Silybum marianum and Silybum eburneum are wild edible Mediterranean plants used in the human diet. This study presents the initial findings on the phytochemical characterization of Tunisian S. marianum and S. eburneum organs.
Samah Maaloul   +9 more
doaj   +1 more source

How is spontaneous symmetry breaking possible? [PDF]

open access: yes, 2011
We pose and resolve a seeming paradox about spontaneous symmetry breaking in the quantum theory of infinite systems. For a symmetry to be spontaneously broken, it must not be implementable by a unitary operator.
Halvorson, Hans, Baker, David John
core  

Tumour–host interactions in Drosophila: mechanisms in the tumour micro‐ and macroenvironment

open access: yesMolecular Oncology, EarlyView.
This review examines how tumour–host crosstalk takes place at multiple levels of biological organisation, from local cell competition and immune crosstalk to organism‐wide metabolic and physiological collapse. Here, we integrate findings from Drosophila melanogaster studies that reveal conserved mechanisms through which tumours hijack host systems to ...
José Teles‐Reis, Tor Erik Rusten
wiley   +1 more source

Organ-dependent variability in mineral composition, phytochemicals and antioxidant potentials in Polygonum equisetiforme parts

open access: yesInternational Journal of Plant Based Pharmaceuticals
Polygonum equisetiforme is a perennial herbaceous plant thriving in the arid regions of Tunisia and widely used in health care and self-medication. The objective of the current study was to investigate the distribution of minerals, phenolic compounds ...
Maher Mahmoudi   +5 more
doaj   +1 more source

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