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1. chinaXiv:202010.00020 [pdf]

Untangling the influence of soil moisture on root pullout property of alfafa plant

ZHANG,Chaobo; LIU,Yating; LIU,Pengchong; JIANG,Jing; YANG,Qihong
Subjects: Geosciences >> History of Geosciences

Root pullout property of plants was of key importance to the soil reinforcement and the improvement of slope stability. To investigate the influence of soil moisture on root pullout resistance and failure modes in soil reinforcement process, we conducted pullout tests on alfalfa (Medicago sativa L.) roots at five levels (40, 30, 20, 10 and 6 kPa) of soil matric suction, corresponding to respectively 7.84%, 9.66%, 13.02%, 19.35% and 27.06% gravimetric soil moisture contents. Results showed that the maximal root pullout force of M. sativa decreased in a power function with increasing soil moisture content from 7.84% to 27.06%. Root slippage rate increased and breakage rate decreased with increasing soil moisture content. At 9.66% soil moisture content, root slippage rate and breakage rate was 56.41% and 43.58%, respectively. The threshold value of soil moisture content was about 9.00% for alfalfa roots in the loess soil. The maximal pullout force of M. sativa increased with root diameter in a power function. The threshold value of root diameter was 1.15 mm, because root slipping force was greater than root breaking force when diameter >1.15 mm, while diameter ≤1.15 mm, root slipping force tended to be less than root breaking force. No significant difference in pullout forces was observed between slipping roots and breaking roots when they had similar diameters. More easily obtained root tensile force (strength) is suggested to be used in root reinforcement models under the condition that the effect of root diameter is excluded as the pullout force of breaking roots measured in pullout tests is similar to the root tensile force obtained by tensile tests.

submitted time 2020-10-20 From cooperative journals:《Journal of Arid Land》 Hits2173Downloads695 Comment 0

2. chinaXiv:201605.01248 [pdf]

The Metabolic Regulator Histone Deacetylase 9 Contributes to Glucose Homeostasis Abnormality Induced by Hepatitis C Virus Infection

Chen, Jizheng; Guo, Min; Tang, Hong; Chen, Xinwen; Wang, Ning; Dong, Mei; Li, Zhong; Han, Xiao; Wang, Qian; Zhao, Yang; Zhuo, Zhiyong; Zhang, Chao; Chi, Xiumei; Pan, Yu; Jiang, Jing; Niu, Junqi; Yang, Dongliang
Subjects: Biology >> Biophysics

Class Ila histone deacetylases (HDACs), such as HDAC4, HDAC5, and HDAC7, provide critical mechanisms for regulating glucose homeostasis. Here we report that HDAC9, another class Ila HDAC, regulates hepatic gluconeogenesis via deacetylation of a Forkhead box 0 (FoxO) family transcription factor, FoxO1, together with HDAC3. Specifically, HDAC9 expression can be strongly induced upon hepatitis C virus (HCV) infection. HCV-induced HDAC9 upregulation enhances gluconeogenesis by promoting the expression of gluconeogenic genes, including phosphoenolpyruvate carboxykinase and glucose-6-phosphatase, indicating a major role for HDAC9 in the development of HCV-associated exaggerated gluconeogenic responses. Moreover, HDAC9 expression levels and gluconeogenic activities were elevated in livers from HCV-infected patients and persistent HCV-infected mice, emphasizing the clinical relevance of these results. Our results suggest HDAC9 is involved in glucose metabolism, HCV-induced abnormal glucose homeostasis, and type 2 diabetes.

submitted time 2016-05-11 Hits843Downloads472 Comment 0

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