Well-documented variations in the (15)N/(14)N ratio in lunar surface samples apparently result from a secular increase in that ratio in the solar wind during the past few billion years. The cause of this change seems to lie in the solar convective zone but is inexplicable within our present understanding of solar processes. This problem therefore ranks with the solar neutrino deficiency as a major challenge to our solar paradigm.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1126/science.245.4917.480 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Secular Trends in Birth Weight in Chile and Its Regions Between 1990 and 2021.
Am J Hum Biol
January 2025
Facultad de Humanidades, Universidad de Santiago de Chile, Santiago, Chile.
Objective: The objective is to analyze secular trends in birth weight (BW) for Chile from 1990 to 2021, focusing on the mean BW and low birth weight (LBW) prevalence, and to assess differences across Chilean regions.
Methods: Our sample, obtained from the Chilean National Statistics Office, contains information on 7 822 975 births, including the total births that took place in Chile from 1990 to 2021. We calculated mean BW and LBW prevalence at a national and a regional level.
Trajectories of Nutritional Quality, Diet-Related Environmental Impact, and Diet Cost in China: How Much Does Ultra-Processed Food and Drink Consumption Matter?
Nutrients
January 2025
Division of Human Nutrition and Health, Wageningen University & Research, 6700 AB Wageningen, The Netherlands.
Background: Rapid socio-economic developments confront China with a rising consumption of ultra-processed foods (UPFs) and ultra-processed drinks (UPDs). This study aims to evaluate their potential impact on diet transformation towards sustainability including nutrition, environmental sustainability, and diet-related cost.
Methods: Dietary intake was assessed by 24 h recalls in 27,311 participants (age: 40.
Trends in tuberculosis mortality among older adults in China, 2004-2021: a Joinpoint regression and age-period-cohort analysis.
Front Public Health
January 2025
Office of Education and Training (Graduate School), Chinese Center for Disease Control and Prevention, Beijing, China.
Background: Tuberculosis (TB) remains a major public health problem in China and globally, particularly among older adults. This study aimed to examine secular trends in TB mortality among older adults in China and the net effects of age, period, and cohort.
Methods: Data from the National Disease Surveillance Points (DSPs) system were analyzed using Joinpoint regression to determine annual changes in TB mortality among individuals aged 60 years and older from 2004 to 2021.
The Role of Feedback Training on Early Postoperative Recovery and Anxiety Scores in an Ambulatory Surgical Unit: A Secular Trend Study.
J Crit Care Med (Targu Mures)
October 2024
Ariel University, School of Health Sciences, Ariel, Israel.
Background: We used a ten-item postoperative quality of recovery score (QoR-10) to assess the perioperative quality of care in an in-hospital ambulatory surgical unit.
Methods: In Phase 1 of this secular trend study (n=300 patients, 3-months duration), we collected QoR-10 scores and potential confounders, including type of anesthesia and surgery; co-morbidities; and anesthesia components of the Amsterdam scale-measured anxiety scores. Phase 2 was the one-month performance feedback learning phase in which modifiable variables identified in Phase 1 were translated to actionable steps, reinforcing the already existing routine of our department's clinical practices, including pain, shivering and anxiety.
Retrospective and longitudinal study of blood pressure in school-aged children.
Clin Nutr ESPEN
January 2025
Hotel-Dieu de France, Department of Endocrinology, Saint-Joseph University of Beirut, Faculty of Medicine, Beirut, Lebanon. Electronic address:
Background: Pediatric hypertension (HTN) is increasing over time. Worldwide, the blood pressure (BP) trend has been poorly studied. The aim of our study is to evaluate the recent trend in BP in a school-aged children sample, and to search for factors that might influence BP variability.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!