Supplementation of alanine improves biomass accumulation and lipid production of Chlorella pyrenoidosa by increasing the respiratory and metabolic processes

The function of exogenous alanine(Ala)in regulating biomass accumulation,lipid production,photosynthesis,and respiration in Chlorella pyrenoidosa was studied.Result shows that the supplementation of Ala increased C.pyrenoidosa biomass and lipid production in an 8-d batch culture.The concentration of 10 mmol/L of Ala was optimum and increased the microalgal cell biomass and lipid content by 39.3%and 21.4%,respectively,compared with that in the control(0-mmol/L Ala).Ala supplementation reduced photosynthetic activity while boosting respiratory activity and pyruvate levels,indicating that C.pyrenoidosa used exogenous Ala for biomass accumulation through the respiratory metabolic process.The accelerated respiratory metabolism due to Ala supplementation elevated the substrate pool and improved the lipogenic gene expression,promoting lipid production at last.This study provided a novel method for increasing biomass accumulation and lipid production and elucidated the role of Ala in regulating lipid production.

Thoughts on the Professional Training of Scientific and Technological Management Team of High-level Talents in Provincial Agricultural Research Institutes

From two aspects:the composition of scientific research management institutions and the tasks undertaken by scientific research management departments,the present situation of scientific and technological management team in agricultural research institutes is expounded.Some problems existed in the scientific and technological management team of provincial agricultural research institutes are analyzed,such as uneven knowledge structure of scientific research management personnel,low degree of specialization,poor stability,lack of professional and systematic job training,etc.Professional development countermeasures are proposed,such as optimizing the structure of scientific research management team,establishing a professional management system with the characteristics of agricultural scientific research institutions,formulating corresponding evaluation mechanism for scientific research management personnel,and strengthening the training of agricultural scientific research management personnel.

Current Situation and Thinking of Introduction,Cultivation and Use of High-level Talents in Agricultural Research Institutes under the New Era:A Case Study of Hebei Academy of Agriculture and Forestry Sciences

Current situation of introduction,cultivation and use of high-level talents in agricultural research institutes are analyzed,and the optimized development strategy of further strengthening the construction,introduction,cultivation and use of high-level talent team is thought.It plays a positive role in provincial agricultural research institutes discovering,cultivating and gathering a number of high-quality talents and high-level innovation teams.

Thoughts on Science and Technology Service in Agricultural Research Institutes:Taking Institute of Plant Protection of Hebei Academy of Agricultural and Forestry Sciences as an Example

Scientific and technological services are necessary for strengthening agriculture.Under the new situation,agricultural research institutes should give full play to their advantages,strive to innovate scientific and technological services methods,and improve scientific and technological service levels.Combined with the practice of science and technology work of Institute of Plant Protection of Hebei Academy of Agricultural and Forestry Sciences,this paper made an in-depth analysis on the present situations and existing problems in the scientific and technological services of agricultural research institutes.Based on the analysis,it came up with recommendations including change ideological concepts,strengthening service awareness,adhering to people-oriented principle,enhancing the team building,improving mechanism construction,stimulating innovative vitality,exploring service methods,and enriching service connotation,so as to improve scientific and technological service works.

Highly efficient and selective removal of phosphate from wastewater of sea cucumber aquaculture for microalgae culture using a new adsorption-membrane separation-coordinated strategy

Enhanced phosphorus treatment and recovery has been continuously pursued due to the stringent wastewater discharge regulations and a phosphate supply shortage. Here, a new adsorption-membrane separation strategy was developed for rational reutilization of phosphate from sea cucumber aquaculture wastewater using a Zr-modified-bentonite filled polyvinyl chloride membrane. The as-obtained polyvinyl chloride/Zr-modified-bentonite membrane was highly permeability (940 L/(m2·h)), 1–2 times higher than those reported in other studies, and its adsorption capacity was high (20.6 mg/g) when the phosphate concentration in water was low (5 mg/L). It remained stable under various conditions, such as different pH, initial phosphate concentrations, and the presence of different ions after 24 h of adsorption in a cross-flow filtration system. The total phosphorus and phosphate removal rate reached 91.5% and 95.9%, respectively, after the membrane was used to treat sea cucumber aquaculture wastewater for 24 h and no other water quality parameters had been changed. After the purification process, the utilization of the membrane as a new source of phosphorus in the phosphorus-free f/2 medium experiments indicated the high cultivability of economic microalgae Phaeodactylum tricornutum FACHB-863 and 1.2 times more chlorophyll a was present than in f/2 medium. The biomass and lipid content of the microalgae in the two different media were similar. The innovative polyvinyl chloride/Zr-modified-bentonite membrane used for phosphorus removal and recovery is an important instrument to establish the groundwork for both the treatment of low concentration phosphate from wastewater as well as the reuse of enriched phosphorus in required fields.

Officials'Foreign Experience and Firms'Exports:Evidence from China

This study examines how the foreign experience of local oficials affects firms'exports in China.Using a matched sample from 2000 to 2012,we found that the foreign experience of municipal Party secretaries had a significant impact on the promotion of firms'exports,especially for private firms.This positive impact was more pronounced when officials went abroad at a younger age,stayed abroad for a longer period,returned to China for a longer time,and had greater promotion incentives.We found that officials'foreign experience helped to mitigate the negative impact of institutional distance and provided firms with better access to export subsidies,both of which could promote exporting.There was also a complementary effect when officials and executives both had foreign experience.Overall,our study provides some insights into the economic outcomes of officials'foreign experience and sheds light on the export performance of Chinese firms.