The properties of organic molecules are intimately related to their shape. In many structurally complex organic molecules, shape is influenced—or dictated—by the three-dimensional orientation of ...

CORRECTION: This story was updated on April 21, 2016, to clarify that the method described was not the first radical-based route to chiral quaternary carbon centers. The method is the first route ...

MADISON, WI, JANUARY 12, 2009 – Geologists, archeologists, anthropologists, ecologists, engineers, and natural resource managers routinely use National Cooperative Soil Survey (NCSS) data across field ...

A new study by Dr. Margherita Mussi, published in Quaternary International, highlights how naturally occurring basalt spheres may have been used by hominin species as a type of tool for more than 1 ...

In medicine, there are four levels of care: primary, secondary, tertiary, and quaternary. The levels of care refer to the complexity of the medical cases that healthcare providers treat and the skills ...

Making molecules with quaternary carbon bonds—four carbons attached to a central C—is tricky but necessary for medicinal chemists. Quaternary C bonds have a discrete shape, Princeton University ...

Tertiary and Quaternary Activities Class 12 Notes: Explorе thе dynamic rеalm of Class 12 Gеography with our comprеhеnsivе rеvision notеs for Chaptеr 6: "Tertiary and Quaternary Activities". Dеlvе into ...

PUNE, India, Nov. 24, 2025 /PRNewswire/ -- Apollo Hospitals, Asia’s pioneering integrated healthcare services provider, today inaugurated its newest facility in Swargate, Pune. The hospital will ...

Researchers at Shandong Second Medical University have developed a dimethyl quaternary ammonium derivative of harmane that shows strong potential for attacking the bacterium through diverse mechanisms ...