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9 results on '"Gao Rufeng"'

6. Influence of light availability on the specific density, size and sinking loss of Anabaena flos-aquae and Scenedesmus obliquus

Author

Xiaojuan Yu, Yingying Huang, Xiaochen Huang, Haichun Zhang, Xuechu Chen, and Gao Rufeng

Subjects
0106 biological sciences, Cyanobacteria, Biomass (ecology), biology, Chemistry, Anabaena, 010604 marine biology & hydrobiology, fungi, 010501 environmental sciences, Oceanography, biology.organism_classification, 01 natural sciences, Algal bloom, Water column, Agronomy, Algae, Green algae, Eutrophication, 0105 earth and related environmental sciences, Water Science and Technology
Abstract

Harmful algal blooms in eutrophic waters pose a serious threat to freshwater ecosystems and human health. In-situ light availability control is one of the most commonly used technologies to suppress algae in lakes and reservoirs. To develop a better understanding of the effects of light on algal growth, specific density, colony size and sinking loss, Anabaena flos-aquae (cyanobacteria) and Scenedesmus obliquus (green algae) were evaluated in varying light scenarios. The results showed that the specific density and colony size of these two species varied during growth, and there were obvious differences among the light scenarios. At the end of exponential phase, S. obliquus incubated under light-limited condition maintained a higher specific density and formed larger aggregates, whereas A. flos-aquae formed a longer filament length. Both species exhibited higher sinking loss rates with lower light availability. These results implied that the sinking loss rate was not always constant but should be considered as a variable response to the change of light availability, and in-situ light availability control might result in a significant increase of the sinking loss of algae due to the change of size and specific density, thereby further affecting the algal biomass in the water column.

Published
2018

9. Association between dietary copper, iron, zinc, selenium intake and osteopenia or osteoporosis in elderly hypertensive patients: a retrospective cohort study.

Author

Chen M, Jia L, and Gao R

Abstract

Aim: The study aimed to investigate the link between dietary copper, iron, zinc, selenium intake with osteopenia and osteoporosis in elderly hypertensive patients., Methods: The data of hypertensive patients were extracted from the National Health and Nutrition Examination Survey 2005-2010, 2013-2014, and 2017-2018. Data of dietary iron, zinc, copper and selenium intakes were obtained according to 24-h diet recall interviews. Osteopenia and osteoporosis were determined based on the bone mineral density. Weighted liner regression and weighted logistic regression were employed to assess the association between iron, zinc, copper, and selenium intakes with osteopenia and osteoporosis. All results were presented as β, odds ratios (ORs), and 95% confidence intervals (CIs)., Results: In total, 5,286 elderly hypertensive patients were included. Among them, 2,961 (56.02%) patients have osteopenia, and 566 (10.71%) have osteoporosis. After adjusting all covariates, dietary copper intake ≥the recommended daily allowance was positively correlated with bone mineral density on total femur (β = 0.086, 95% CI: 0.021-0.152) and femoral neck (β = 0.097, 95% CI: 0.016-0.178). Dietary zinc intake ≥the recommended daily allowance was also positively correlated with bone mineral density on total femur (β = 0.092, 95% CI: 0.030-0.153) and femoral neck (β = 0.122, 95% CI: 0.050-0.193). Dietary copper (O = 0.581, 95% CI: 0.394-0.858) and zinc (OR = 0.595, 95% CI: 0.429-0.827) intake ≥the recommended daily allowance levels were related to increased odds of osteoporosis in elderly with hypertension., Conclusion: Higher dietary copper and zinc intake was associated with lower odds of osteoporosis in the elderly hypertensive patients. Higher dietary intake included copper and zinc may be beneficial for the bone health in the elderly hypertensive patients., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 Chen, Jia and Gao.)

Published
2024
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