Search

As a theoretical thought with both scientific and practical nature, ideological and political education of the course adheres to the tenet of "Invisible Education, Establishing Virtue, and Enriching People", and delivers the knowledge of ideological and political education under the guidance of scientific theories, such as Marxism, and ultimately achieves the effect of ideological and political education. Facility Fruit Tree Cultivation is one of the major core courses in Facility Agricultural Science and Engineering in College of Horticulture, Xinjiang Agricultural University. This paper carries out the exploration of the course ideological and political education from the revision of the course syllabus, the improvement of teaching methods and the construction of the course ideological and political education system in three aspects, which provides a reference for the promotion of the ideological and political education of local universities in the field of facility agricultural science and engineering. [ABSTRACT FROM AUTHOR]

Greenhouses have been widely used in facility agriculture at present. Gutter-connected greenhouses have been also extensively implemented to enhance the structural span for high land utilization with simplified mechanization. Among them, Venlo greenhouse has been the preferred choice among various forms of roof trusses, due to the simplified installation, superior light transmittance, and excellent sealing. The "National standard for the design of greenhouse structure " also released that "seismic action shall be calculated in the structural design of glass greenhouse for agricultural production in areas with seismic fortification intensity of 8 degrees (0.30g) and above". In this study, a regular-shaped Venlo-type greenhouse was designed to investigate the seismic performance and response using a shaking table test. A scaled-down model was then established with one span and two openings. The dynamic features of the modeled structure were analyzed to determine the acceleration response of the structure under the action of the 7-degree frequent, 7-degree fortification intensity, 7-degree rare, 8-degree rare, and 8-degree semi-rare earthquake. Numerical simulation was carried out in conjunction with finite element (FE) ANSYS software. The test and simulation were compared to verify the reliability of dynamic time-range analysis. In addition, the numerical model was established, according to the structural design of a Venlo greenhouse project. The time-history analysis was carried out under the action of 8 degrees and half rare earthquakes (the maximum acceleration time history was 0.51g). Meanwhile, the combination of permanent, snow, and crop load was selected, according to the specification. Three groups of seismic waves (namely AKT, NGA, and artificial wave) were input into the structure of the greenhouse. The mode of structure was analyzed to determine the internal force, vibration pattern and displacement with/without the action of the seismic waves. The results show that the maximum stresses in the overall structure of the greenhouse under seismic action were 1.24-2.12 times higher than those under no seismic action. The structural stresses during the action of artificial waves exceeded the yield strength of the material. Two cases (b1 and b2) were applied under the action of the same set of seismic waves. The b1 case was adopted to combine the live load with crop and snow loads, whereas, the b2 case combined the crop load only. There were similar values in the column top displacements. The seismic action dominated the column top displacements in these cases. The maximum displacements occurred in the outside wall storm columns. The largest displacement response was observed at the top of the structural columns under the action of artificial waves. The maximum of up to 72.17 mm exceeded the standard requirement of 1/250 of the elastic inter-story displacement angle for the seismic design of Chinese buildings. The research results can provide a theoretical reference for the safe design of Venlo greenhouse under seismic action. [ABSTRACT FROM AUTHOR]

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Forest & Environment is the property of Journal of Forest & Environment Editorial and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: The osteogenic potential of periodontal ligament stem cells (as seed cells) has become a research hotspot. The regulation of periodontal ligament stem cells on osteoclast activity is less studied and deserves further exploration. OBJECTIVE: To investigate the effect of three-dimensional cultured periodontal ligament stem cells under continuous static compression on the osteoclastic differentiation of RAW264.7 cells. METHODS: Periodontal ligament stem cells at passages 3 and 4 were taken for three-dimensional culture and randomly divided into 13 groups. Continuous static compression of 5 kPa (2, 6, and 12 hours), 25 kPa (2, 6, and 12 hours), 45 kPa (2, 6, and 12 hours), and 65 kPa (2, 6, and 12 hours) was applied by FLEXCELL 5000C, and group 13 with no compression. The cell supernatant was used as a conditioned medium to act on RAW264.7 cells. The expression of osteoclast differentiation genes tartrate resistant acid phosphatase, cathepsin K, and matrix metalloproteinase 9 was detected by qPCR and tartrate resistant acid phosphatase staining after 5 days. RESULTS AND CONCLUSION: (1) The scaffold morphology was stable and the cell status was good in the compression experimental group and the noncompression control group under three-dimensional culture. (2) The conditioned medium of periodontal ligament stem cells in the compression loading group promoted the osteoclastic differentiation of RAW264.7 cells. (3) Within a certain range, the pro-osteoclastic effect was positively correlated with the force conditions. At 45 kPa and 12 hours, RAW264.7 cells had the strongest osteoclastic differentiation effect. The osteoclast-promoting ability of 65 kPa and 12- hour group was weakened. (4) These findings indicated that the osteoclastic differentiation of RAW264.7 cells was promoted by three-dimensional cultured periodontal ligament stem cells under static compression through the paracrine pathway, and the force conditions were correlated with the osteoclast effect. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To understand the prevalence of chronic diseases among the rural elderly in Yulong County and Fumin County of Yunnan Province, explore and analyze the relationship between elderly chronic diseases and physical labor intensity, and provide targeted prevention and control strategies for the prevention and treatment of elderly chronic diseases. Methods Multi-stage stratified random sampling method was used in this survey and the elderly 2 299 elderly people aged ≥60 years in rural areas of Yulong County and Fumin County of Yunnan Province were selected. The elderly aged 60 years and above were investigated with questionnaires and physical examinations on the prevalence of 10 chronic diseases, including diabetes, hypertension, coronary heart disease, stroke, COPD, asthma, hyperlipidemia, chronic kidney disease, gastrointestinal ulcer, and cataract. Descriptive analysis, χ2 test and multivariate logistic regression analysis were used to analyze the influencing factors. Results There were statistically significant differences between different ethnic groups in whether they have read books, whether they live alone, whether they are farmers, whether they are physical labor intensity, and whether they are obese (χ2 test, P < 0.05). The prevalence of chronic diseases in the elderly was 83.3%, of which the prevalence of chronic diseases in the Han nationality was 83.1%, and the prevalence of chronic diseases in the Naxi nationality was 83.6%. With the increase of age, in addition to the decline in the prevalence of chronic diseases in the population aged 75 and over, the prevalence of chronic diseases in the elderly population in the surveyed areas showed an upward trend, and the difference was statistically significant (χ2 test, P < 0.05). Central obesity was a risk factor for chronic diseases in the elderly. The risk of chronic diseases in elderly people with central obesity was 1.895 times that without central obesity. The moderate-intensity physical labor was a protective factor for elderly chronic diseases. The risk of chronic disease of moderate-intensity physical labor was 0.643 times that of low-intensity physical labor, and the difference was statistically significant (P < 0.05). With the increase of age, the proportion of high-intensity physical labor showed a downward trend, and the proportion of light-intensity physical labor showed an upward trend, and the difference was statistically significant (χ2 test, P < 0.05). Conclusions Central obesity and physical labor intensity are the influencing factors of chronic diseases in the elderly. There are differences in physical labor intensity with the increase of age, suggesting that to prevent chronic diseases in the elderly, it is necessary to continue to do a good job in health education for the elderly in terms of lifestyle and to further prevent the aging occurrence of chronic diseases. [ABSTRACT FROM AUTHOR]

Due to the limited self-repair ability of neurons after injury, there has been a lack of effective treatments for nerve injury in clinical practice. So, to find drugs that promote the repair after nerve injury has become a research hotspot. Schwann cells and neurons play an important role in regeneration of the peripheral nerves after injury. This review summarizes the classification of peripheral nerve injury, the signaling pathways related to peripheral nerve regeneration in Schwann cells and neurons as well as diseases related to peripheral nerve injury, and provides a basis for further exploration of the regeneration mechanism after peripheral nerve injury. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chinese Mass Spectrometry Society is the property of Journal of Chinese Mass Spectrometry Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Xinjiang Agricultural Sciences is the property of Xinjiang Agricultural Sciences Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Xinyang Normal University Natural Science Edition is the property of Journal of Xinyang Normal University Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Research of Environmental Sciences is the property of Research of Environmental Sciences Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To establish a non-venous bypass orthotopic liver transplantation model in Bama miniature pigs with high repeatability and stability. Methods Twelve Bama miniature pigs were randomly divided into the donor group (n=6) and recipient group (n=6). Pigs underwent non-venous bypass orthotopic liver transplantation. The time of anhepatic phase during operation was shortened, blood pressure during anhepatic phase was stably maintained, and management of anesthesia and body fluid during operation were strengthened. The operation time, anhepatic phase and survival status of the recipients were observed and recorded. The intraoperative heart rate, mean arterial pressure (MAP) and changes in arterial blood gas analysis were monitored. The perioperative liver function was evaluated. Results Among 6 Bama miniature pigs, 1 died from transplantation failure intraoperatively. The operation time of the remaining 5 pigs was (247±27) min and the time of anhepatic phase was (46±4) min. Three animals survived for more than 2 weeks. Compared with the preanhepatic phase, the heart rate of the animals was significantly faster, MAP was considerably reduced to (46±6) mmHg, blood pH value, base excess (BE) and HCO3 - level were all significantly decreased and serum level of K+ was significantly elevated during the anhepatic phase (all P<0.05). In the neohepatic phase, MAP of Bama miniature pigs was significantly increased, heart rate was dramatically slower.Blood pH value, BE, HCO3 - level were significantly increased and serum level of K+ was significantly declined (all P<0.05). During abdominal closure, MAP, blood gas indexes and serum level of K+ were almost recovered to those in the preanhepatic phase. Compared with preoperative levels, the levels of alanine aminotransferase（ALT）, aspartate aminotransferase（AST）, lactate dehydrogenase（LDH）and alkaline phosphatase（ALP）were significantly increased after operation (all P<0.05), the change in AST was the most obvious, and it gradually decreased at postoperative 2 d. The level of γ-gutamyl transferase （GGT） did not significantly elevated. The level of total bilirubin (TB) was evidently elevated at postoperative 5 d. Compared with the preoperative levels, the levels of total protein (TP) and albumin (ALB) were significantly decreased after operation (both P<0.05), and began to gradually increase at postoperative 1 d. Conclusions The non-venous bypass orthotopic liver transplantation model of Bama miniature pig is convenient, with highly reproducible and survival rate, which can be utilized as a standardized liver transplantation model. [ABSTRACT FROM AUTHOR]