Effect of enhanced UV-B radiation on methane emission in a paddy field and rice root exudation of low-molecular-weight organic acids

2016 ◽  
Vol 15 (6) ◽  
pp. 735-743 ◽  
Author(s):  
Yongmei He ◽  
Fangdong Zhan ◽  
Yuan Li ◽  
Weiwei Xu ◽  
Yanqun Zu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Acids ◽  
Methane Emission ◽  
Paddy Field ◽  
Root Exudation ◽  
Rice Paddy ◽  
Rice Root ◽  
Low Molecular Weight ◽  
Notable Effect ◽  
Solar Uv

Solar UV-B radiation had a notable effect on the emission of CH4 from a rice paddy, of which the mechanism was related to its influence on the excretion by roots of LMWOAs in the rhizosphere.

LC–MS analysis of low molecular weight organic acids derived from root exudation

2010 ◽  
Vol 400 (8) ◽  
pp. 2587-2596 ◽  
Author(s):  
Leonhard Jaitz ◽  
Bernhard Mueller ◽  
Gunda Koellensperger ◽  
Daniela Huber ◽  
Eva Oburger ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Acids ◽  
Root Exudation ◽  
Low Molecular Weight ◽  
Ms Analysis

scholarly journals Aggregation, Sedimentation, and Dissolution of Copper Oxide Nanoparticles: Influence of Low-Molecular-Weight Organic Acids from Root Exudates

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 841 ◽  
Author(s):  
Cheng Peng ◽  
Hong Tong ◽  
Peng Yuan ◽  
Lijuan Sun ◽  
Lei Jiang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Acids ◽  
Root Exudates ◽  
Copper Oxide Nanoparticles ◽  
Rice Root ◽  
Low Molecular Weight ◽  
Plant Interactions ◽  
Cuo Nps ◽  
The Individual ◽  
Almost All

The rhizosphere is an essential pathway for the uptake of metal-based nanoparticles (MNPs) by plant roots. However, the interaction between root exudates and MNPs is still unclear. In this study, we initially identified the major low-molecular-weight organic acids (LMWOAs) in the rice root exudates using hydroponics. Then, the individual LMWOAs were added to CuO nanoparticle suspensions to investigate their effects on the environmental behavior of the MNPs. The results showed that both the variety and the concentration of LMWOAs impacted the aggregation, sedimentation, and dissolution of CuO nanoparticles (NPs). Almost all LMWOAs except succinic acid inhibited the aggregation of CuO NPs by enhancing the electrostatic repulsive force between NPs. The presence of citric and oxalic acids rather than lactic acid greatly improved the stability of CuO NP suspensions, but other acids showed a low promoting and high inhibiting effect on NP sedimentation. Moreover, all the LMWOAs from root exudates facilitated the dissolution of CuO NPs with a positive dose-dependent correlation, especially formic acid. Notably, citric acid, as the most abundant LMWOAs in rice root exudates, largely determined the aggregation, sedimentation, and dissolution of CuO NPs. This study provides a better understanding on NP–plant interactions in the rhizosphere.

scholarly journals INFLUENCE OF VARIOUS FEED ADDITIVES ON THE ACTIVITY OF CHYME AND BLOOD PLASMA ENZYMES OF YOUNG MEAT CHICKEN OF ORIGINAL LINE

THE BULLETIN ◽  
2021 ◽  
Vol 2 (390) ◽  
pp. 12-17
Author(s):  
A. Grozina
Keyword(s):  
Molecular Weight ◽  
Organic Acids ◽  
Blood Plasma ◽  
Digestive Enzymes ◽  
Feed Additives ◽  
Pancreatic Enzymes ◽  
Control Group ◽  
Physiological Status ◽  
Low Molecular Weight ◽  
Original Line

The research aimed to determine the effect of a mixture of low molecular weight organic acids and complex phytobiotics when replacing a feed antibiotic with them on the activity of digestive enzymes in the duode-nal chyme and the activity of pancreatic enzymes in the blood plasma of young stock B5 and B9 meat chicken lines. The experiments were carried out on the original lines of meat poultry lines B5 (Cornish) and B9 (Plymouth rock). There was an operation to insert a cannula into the duodenum at the age of 6 weeks. The enzymatic activity of the duodenum chyme and the content of pancreatic enzymes in the blood plasma in the groups of chickens receiving antibiotics, low molecular weight organic acids, and phytobiotics with the diet. The data showed that the influence of feed additives on the physiological status of poultry was different. The use of low molecular weight organic acids of the B5 and B9 chicken lines had a significant effect on the production of digestive enzymes due to an increase in the activity of chyme lipase (by 98.3%) and blood plasma lipase (by 26.6%) in B9 chickens and an increase in chyme proteases (by 30.9%) in B5 chickens compared with the control group, where the antibiotic was used. The introduction of complex phytobiotics into the diet had a negative effect on chickens of the B5 line (Cornish), reducing the activity of amylase and lipase of the duodenal chyme (by 29.2 and 26.9%) compared with the control group. In B9 (Plymouth rock) chickens, only the chyme amylase activity increased by 30.8% that indicates an improvement in the availability of feed carbohydrates. These data confirm the need to take into account the different effects of feed additives on the digestion processes in different poultry crosses.

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