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Related Concept Videos

Ecological Disturbance02:26

Ecological Disturbance

An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.Ecological disturbances can be caused by an event as small as the trampling of underbrush to an incident as wide-ranging as a forest...
Convergent Evolution01:54

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
E2 Reaction: Stereochemistry and Regiochemistry02:43

E2 Reaction: Stereochemistry and Regiochemistry

Elimination reactions of alkyl halides can yield one or more alkenes depending on the specific regiochemical and stereochemical considerations. While the regiochemistry of the reaction governs the location of the double bond in the product, the stereochemical requirements often influence the geometry.
When a substrate with two different β hydrogens undergoes an E2 elimination, the presence of a strong base can yield two regioisomeric alkenes. The more-substituted alkene is the major product and...
E1 Reaction: Stereochemistry and Regiochemistry02:43

E1 Reaction: Stereochemistry and Regiochemistry

One of the critical aspects of the E1 reaction mechanism, as also observed in E2, is the regiochemistry, with multiple regioisomers obtained as products. In the example discussed, the presence of water as a weak base favors elimination over substitution to generate two alkenes. Given that alkenes’ stability increases with the number of alkyl groups across the double bond, typically, E1 reactions lead to the Zaitsev product, for this is more substituted and stable than the Hofmann product.
Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Thomson's e/m Experiment01:19

Thomson's e/m Experiment

In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...

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Reply to E.C. Dee et al

Bogda Koczwara1, Alexandre Chan1, Michael Jefford1

  • 1Bogda Koczwara, MBioethics, Department of Medical Oncology, Flinders Medical Centre, College of Medicine and Public Health, Flinders University, Adelaide, Australia; Alexandre Chan, PharmD, MPH, School of Pharmacy and Pharmaceutical Sciences, University of California, Irvine, CA, Department of Oncology Pharmacy, National Cancer Centre Singapore, Singapore; Michael Jefford, MBBS, PhD, MPH, MHlthServMt, Department of Health Services Research and Australian Cancer Survivorship Centre, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia, Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Victoria, Australia; Wendy W.T. Lam, MSc, Jockey Club Institute of Cancer Care, LKS Faculty of Medicine and Centre for Psycho-oncology Research and Training, School of Public Health, The University of Hong Kong, Hong Kong, China; Carolyn Taylor, BFA, Global Focus on Cancer, South Salem, NY; Claire E. Wakefield, PhD, MPH, School of Clinical Medicine, UNSW Medicine & Health, Discipline of Paediatrics and Child Health, Sydney, Australia, Behavioural Sciences Unit, Kids Cancer Centre, Sydney Children's Hospital, Randwick, Australia; Nirmala Bhoo Pathy, MD, PhD, Centre for Epidemiology and Evidence Based Practice, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia; Bishal Gyawali, MD, PhD, Queen's Global Oncology Program, Department of Oncology, Queen's University, Kingston, Canada; Gregory Harvet, MD, Department of Paediatrics, Centre Hospitalier Territorial, Noumea, New Caledonia; Yan Lou, PhD, RN, School of Nursing, Department of Medicine, Hangzhou Normal University, Hangzhou, Zhejiang Province, China; C.S. Pramesh MS, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India; Miyako Takahashi, MD, PhD, Japan Cancer Survivorship Network, Tokyo, Japan, Iwate Medical University, Iwate, Japan; Ke Yu, PhD, Tokyo Jikei University School of Medicine, Tokyo, Japan; and Raymond J. Chan, PhD, RN, Caring Futures Institute, College of Nursing and Health Sciences, Flinders University, Bedford Park, Australia.

JCO Global Oncology
|June 8, 2023
PubMed
Summary

No abstract available in PubMed .

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