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Category: chemistry

Striatal Dopamine Transporter and Rest Tremor in Parkinson DiseaseA Clinical Validation

【】 Full article: (Authored by Nader Butto, from Petah Tikva, Israel.)

This work presents a vortex-based geometric interpretation of atomic structure, in which electrons are described as localized vortex excitations embedded in a structured vacuum, offering a physically intuitive framework for understanding shells, subshells, orbitals, quantum numbers, and electron configurations without altering the formal structure of quantum mechanics. QUANTUM_NUMBERS vortex_geometry ElectronConfiguration.

1. Introduction

The atomic structure of matter represents one of the foundational achievements of modern physics and chemistry. Early experimental investigations by Rutherford established the nuclear model of the atom [1], while Bohr introduced the concept of discrete electronic energy levels to explain atomic spectra [2]. Sommerfeld subsequently extended this picture by incorporating angular momentum quantization and relativistic corrections [3]. These developments paved the way for the formulation of quantum mechanics, which replaced classical electron orbits with a wave-based description of electronic states.

The quantum-mechanical framework, formalized through the work of Schrödinger, Pauli, Born, and Dirac, provides a mathematically rigorous and highly successful description of atomic behavior [4]-[7]. Within this formalism, electrons are described by wavefunctions whose squared modulus gives the probability density of finding an electron in a given region of space. Atomic orbitals arise as solutions of the Schrödinger equation and are characterized by a set of quantum numbers that determine their energy, angular momentum, spatial orientation, and spin. This approach accurately predicts atomic spectra, selection rules, and chemical periodicity.

Hackers meet their match: New DNA encryption protects engineered cells from within

Engineered cells are a high-value genetic asset that is key to many fields, including biotechnology, medicine, aging, and stem cell research, with the global market projected to reach $8.0 trillion USD by 2035. Yet the only ways to keep the cells safe are strong locks and watchful guards.

In Science Advances, a team of U.S. researchers present a new approach to genetically securing precious biological material. They created a genetic combination lock in which the locking or encryption process scrambled the DNA of a cell so that its important instructions were non-functional and couldn’t be easily read or used.

The unlocking, or decryption, process involves adding a series of chemicals in a precise order over time—like entering a password—to activate recombinases, which then unscramble the DNA to their original, functional form.

Chang’e mission samples reveal how exogenous organic matter evolves on the moon

Elements essential to life, such as carbon, nitrogen, oxygen, phosphorus, and sulfur, were “delivered” to Earth and the moon during the early stages of the solar system via asteroids and comets impacting their surfaces. These exogenous materials may have provided the chemical building blocks necessary for the origin and early evolution of life on Earth. But extensive geological activity and biological processes on Earth have largely erased the direct records of these early inputs on our planet.

In contrast, the moon, with its relatively limited geological activity, serves as a natural “time capsule,” making it easier to unravel the history and evolution of extraterrestrial organic matter.

A recent study has, for the first time, systematically identified multiple nitrogen-bearing organic species on the surfaces of lunar soil grains returned by China’s Chang’e-5 and Chang’e-6 missions. The research further reveals an evolutionary pathway defined by exogenous delivery, impact modification, and continuous solar wind processing.

Scientists discover f-block metals yield new oxygen-binding chemistry

Iron and oxygen bind together throughout the body. Most famously, iron binds dioxygen, or two oxygens paired with each other, in hemoglobin that transports oxygen through blood. But iron-oxo compounds, as they’re called, are found in many other places throughout the body. For example, the highly reactive iron-oxo is used in liver enzymes that metabolize drugs.

Rice University chemist Raúl Hernández Sánchez was interested in how oxygen could react with other types of metals—ones that reside on the lowest section of the periodic table, known as f-block metals, with lanthanides on the upper row and actinides on the lower.

If lanthanides could bind with oxygen, he theorized, it would form a highly reactive lanthanide-oxo compound that potentially could be used as a synthetic replacement for iron-oxo, opening up a new toolbox for small molecule chemists interested in studying these biological reactions.

How bromoform wrecks ozone: Ultrafast ‘roaming’ step captured in 150 femtoseconds

The halomethane compound bromoform (CHBr3) has devastating effects on the ozone layer. In the upper layers of the atmosphere, bromoform reacts with UV radiation, releasing bromine molecules which destroy ozone molecules. This reaction, however, has long puzzled scientists; the molecules involved seem to wander relative to each other in a way that energetically does not make sense. Scientists at European XFEL have now revealed structural evidence for this roaming mechanism for the first time, establishing it as a universal characteristic of photochemical reactions.

The study, published in Nature Communications, provides key insights into the field of atmospheric photochemistry and how halomethane compounds such as bromoform impact the ozone layer.

The ozone layer envelops Earth some 15–30 km above the planet’s surface. Ozone gas absorbs ultraviolet light as it enters the atmosphere, thereby protecting life on Earth from the effects of the harmful radiation. Ozone, however, reacts readily with other compounds also found in the stratosphere, leading to ozone depletion, and ultimately the creation of the ozone hole.

Specific Gravity Made Easy | Float, Sink & Hydrometer Explained

In this Easy Peasy Chemistry lesson, we break down Specific Gravity in a simple and clear way!

After learning about density, it’s time to understand how substances compare to water. Why do some objects float while others sink? What does a hydrometer reading like 1.25 actually mean?

In this video, you’ll learn:

• What specific gravity really means
• How it is different from density
• Why water is used as the reference
• How floating and sinking are related
• How a hydrometer measures specific gravity
• Why specific gravity has no units.

This lesson is perfect for high school, college, pre-med, nursing, and engineering students.

Watch till the end to fully understand how scientists measure and compare densities in the lab.

Continue reading “Specific Gravity Made Easy | Float, Sink & Hydrometer Explained” | >

Tau mutation drives autophagy-lysosome dysfunction

The researchers studied a specific mutation in a brain protein called tau that causes the protein to become misfolded and alter its normal function. In general, when tau proteins become misfolded, they build up inside neurons and contribute to various forms of dementia, including Alzheimer’s dementia and frontotemporal dementia, a neurodegenerative disease similar to Alzheimer’s that often strikes earlier — in middle age — and typically involves significant changes in personality and behavior that precede cognitive decline.

In this new study, the researchers studied neurons that had been reprogrammed from skin cells sampled from patients with frontotemporal dementia who carried the tau mutation. In the neurons, the mutated tau proteins caused waste-recycling centers called lysosomes, which are involved in autophagy, to become dysfunctional, allowing cellular waste to accumulate in the lysosomes, which may contribute to neuronal death. The researchers found that enhancing autophagy with an analog of the chemical compound G2 improved clearance of the garbage, reduced tau levels in the lysosomes and prevented cellular toxicity and death.

G2 was discovered in 2019 via screening experiments seeking drugs that could reduce the accumulation of an aggregation-prone protein in a C. elegans model of alpha-1-antitrypsin deficiency, which can cause severe liver disease. The compound was later shown to boost autophagy function in mammalian cell model systems.

The researchers also have shown that G2 can protect brain cells from death in cells modeling Huntington’s disease, a fatal inherited neurodegenerative disease caused by a genetic mutation present at birth. In the cellular model of Huntington’s disease, the compound prevented the buildup of a harmful RNA molecule. ScienceMission sciencenewshighlights.

New research adds to growing evidence that helping brain cells break down and eliminate their own cellular waste is a promising treatment strategy for a variety of neurodegenerative diseases. In lab experiments, the researchers found that exposure to a novel compound can clear a harmful protein from human neurons modeling frontotemporal dementia — a devastating and ultimately fatal condition — and prevent those neurons from dying.

The study is published in the journal Nature Communications.

Continue reading “Tau mutation drives autophagy-lysosome dysfunction” | >

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