A fundamental aspect of any element is the range of oxidation states accessible for useful chemistry. This tutorial describes the recent expansion of the number of oxidation states available to the ...rare-earth and actinide metals in molecular complexes that has resulted through organometallic chemistry involving the cyclopentadienyl ligand. These discoveries demonstrate that the cyclopentadienyl ligand, which has been a key component in the development of organometallic chemistry since the seminal discovery of ferrocene in the 1950s, continues to contribute to the advancement of science. Background information on the rare-earth and actinide elements is presented, as well as the sequence of events that led to these unexpected developments in the oxidation state chemistry of these metals.
Loss of skeletal muscle mass occurs during aging (sarcopenia), disease (cachexia), or inactivity (atrophy). This article contrasts and compares the metabolic causes of loss of muscle resulting from ...these conditions. An understanding of the underlying causes of muscle loss is critical for the development of strategies and therapies to preserve muscle mass and function. Loss of skeletal muscle protein results from an imbalance between the rate of muscle protein synthesis and degradation. Cachexia, sarcopenia, and atrophy due to inactivity are characterized by a loss of muscle mass. Each of these conditions results in a metabolic adaptation of increased protein degradation (cachexia), decreased rate of muscle protein synthesis (inactivity), or an alteration in both (sarcopenia). The clinical consequences of bedrest may mimic those of cachexia, including rapid loss of muscle, insulin resistance, and weakness. Prophylaxis against bedrest-induced atrophy includes nutrition support with an emphasis on high-quality protein. Nutritional supplementation alone may not prevent muscle loss secondary to cachexia, but, in combination with the use of an anabolic agent, it may slow or prevent muscle loss.
Pharmacogenomics in the clinic Relling, Mary V; Evans, William E
Nature,
10/2015, Letnik:
526, Številka:
7573
Journal Article
Recenzirano
Odprti dostop
After decades of discovery, inherited variations have been identified in approximately 20 genes that affect about 80 medications and are actionable in the clinic. And some somatically acquired ...genetic variants direct the choice of 'targeted' anticancer drugs for individual patients. Current efforts that focus on the processes required to appropriately act on pharmacogenomic variability in the clinic are moving away from discovery and towards implementation of an evidenced-based strategy for improving the use of medications, thereby providing a cornerstone for precision medicine.
Lake Hydrology Evans III, William LeRoy
2021, 2021-06-03
eBook
With fresh water becoming a critical issue around the world, lake mass balance—the hydrology or water movement in lakes—is increasingly important to environmental studies and remediation projects. ...Unfortunately, lake hydrology is often only briefly covered in broader texts on hydrogeology and hydrology or is confined to specialized research papers.
In Lake Hydrology, the first book focused on the topic, William LeRoy Evans III rigorously describes the hydrology of flow into and out of lake systems. Explaining the physical parameters that influence lake behavior, as well as the mathematics that describes these systems, this in-depth book fills an important niche in the literature of watershed science. This text
• describes the physical structure and nature of drainage basins and explains the origin and classification of lakes
• explores the hydrology of lake mass balance and storage as it pertains to lake stage, groundwater and lake bottom interaction, hypsometry, lake hydraulics, precipitation, surface flow, evaporation, and transpiration
• provides models, practical information, and solutions for lake management or remediation planning utilizing basic data, including stage fluctuation, evapotranspiration, lake-bottom seepage, precipitation, and surface flow
• uses examples from real-world long-term studies, including Utah's Great Salt Lake and Florida's Lake Jackson, a karstic lake system
• examines the effect of storm events including the temporal and areal distribution of rainfall, and flow paths of water in the catchment from precipitation
• includes a brief introduction on relevant scientific principles, such as dimensional analysis, the properties of water, and the hydrologic cycle
Unlike most limnology texts, which emphasize lake ecology and biology, Lake Hydrology is designed to truly elucidate the hydrology of lake systems, especially as it relates to components of the hydrologic cycle. This book will greatly benefit professionals and researchers involved in lake management, remediation, or investigation of lake systems, and can be used as is or integrated within graduate and advanced undergraduate courses in limnology.
The 50th anniversary of Seminars in Hematology coincides with the 50th anniversary of St. Jude Children's Research Hospital, and both milestones are inexorably linked to studies contributing to the ...cure of childhood acute lymphoblastic leukemia (ALL). We thought it fitting, therefore, to mark these events by traveling back in time to point out some of the achievements, institutions, study groups, and individuals that have made cure of childhood ALL a reality. In many instances, progress was driven by new ideas, while in others it was driven by new experimental tools that allowed more precise assessment of the biology of leukemic blasts and their utility in selecting therapy. We also discuss a number of contemporary advances that point the way to exciting future directions. Whatever pathways are taken, a clear challenge will be to use emerging genome-based or immunologic-based treatment options in ways that will enhance, rather than duplicate or compromise, recent gains in outcome with classic cytotoxic chemotherapy. The theme of this journey serves as a reminder of the chief ingredient of any research directed to a catastrophic disease such as ALL. It is the audacity of a small group of investigators who confronted a childhood cancer with the goal of cure, not palliation, as their mindset.
Formulating insightful questions and experiments is crucial to the advancement of science. The purpose of this Perspective is to encourage scientists in all areas of chemistry to ask more “What if?” ...questions: What if we tried this experiment? What if we used these conditions? What if that idea is not correct? To stimulate this thinking, a retrospective analysis of a specific field, in this case rare-earth metal chemistry, is presented that describes the “What if?” questions that could have and should have been asked earlier based on our current knowledge. The goal is to provide scientists with a historical perspective of discovery that exemplifies how previous views in chemistry were often narrowed by predominant beliefs in principles that were incorrect. The same situation is likely to exist today, but we do not realize the limitations! Hopefully, this analysis can be used as a springboard for posing important “What if?” questions that should be asked right now in every area of chemical research.
A surprisingly large amount of variance reduction has been observed when filtering International Organization for Standardization (ISO) "ISO Method" continuous particulate air monitor (CPAM) airborne ...radioactivity concentration estimates with a simple three-point moving average. This processing has relatively little lag relative to the amount of variance reduction obtained. The key factor producing this effect is the specific autocorrelation structure of the estimated concentrations, which are based on taking first differences of integrated-count data; this scheme results in successive count differences that contain a common count value between them. The observed variance reduction factor has also been derived analytically.
PDF
