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Copyright of Acta Scientiarum Naturalium Universitatis Pekinensis is the property of Editorial Office of Acta Scientiarum Naturalium Universitatis Pekinensis 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 Chinese Journal of Cancer Biotherapy is the property of Editorial Office of Chinese Journal of Cancer Biotherapy 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 Chinese Potato Journal is the property of Northeast Agricultural University 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 Engineering Science Research & Application is the property of Omniscient Pte. Ltd. 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 Molecular Science is the property of Journal of Molecular Science 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 Journal of Mine Automation is the property of Industry & Mine Automation 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.)

Currently， with the changes in living habits and eating habits of China， consumers have higher requirements for the wearing comfort and fit of head and face products such as helmets and masks. In addition， the outbreak of COVID-19 in 2019 has made suitable masks an important protective equipment for medical staff and the general population. How to improve the safety protection level of masks has also become a hot social issue of concern. The fit of the mask is directly related to the protection effectiveness， so it is urgent to measure， track and update human head and face data. The research on the characteristics and classification of human head and face is an important basis for the structural design， size formulation， fit research and plate shape optimization of masks and helmets. Multilayer perceptron is an ANN algorithm. With the development of neural network technology， it is gradually applied to prediction and classification. The model， with strong nonlinear approximation function， simple structure， controllable number of input variables， and strong operability， can be applied to the classification and prediction of human body shape. In order to improve the adaptability of head and face products， this paper took 189 female college students aged 18-26 as the research subjects and used the Martin measuring instrument to measure the head and face of the subjects. Feature factors affecting head and face shape were extracted by principal component analysis （PCA）， the K-Means method was used to classify the head and face morphology， index classification method was used to quantify head and face morphology. As a result， a head-face shape prediction model based on MLP-ANN was proposed to improve the problem of low production work efficiency caused by too many head and face sizes in classifying or selecting models with too many references. The study found that: through the analysis of head and face characteristics of 189 subjects， seven important characteristic factors affecting the head and face shape were extracted: head contour factor， morphological facial factor， morphological facial factor， eye factor， nose factor and mouth ＆ lip factor. The head and face shapes were divided into five sizes according to the clustering center value of each category: XS type/morphological index>93， S type/morphological index∈(88， 93]， M type/morphological index∈(84， 88]， L type/morphological index∈(79， 84]， XL type/morphological index≤79， and the M type was the most widely distributed and had a big coverage rate， so it can be used as an intermediate type. Then through the MLP neural network， seven head-face feature factors were used to predict Head-face shape classification. The generated model had a 93.42% correct prediction result， and the research results can provide a reference for the design and production of head and face products. This paper provides an objective method for the study of head and facial features， but there are still some limitations. In the future， we can continue to improve the classification of head and face shape by expanding the area and age of the experimental subjects for comparative research. We can apply the classification to the head and face product specification system， so as to accumulate morphological data for the study of the head and face characteristics of contemporary Chinese people and the design of head and face products such as masks for the Chinese market. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Engineering for Thermal Energy & Power / Reneng Dongli Gongcheng is the property of Journal of Engineering for Thermal Energy & Power 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 explore the changes of glucose metabolism and renal function in patients with gestational hypothyroidism and their clinical significance. Methods: A total of 60 pregnant women with hypothyroidism who visited our hospital from June 2015 to August 2019 were selected as the hypothyroidism group and 60 healthy pregnant women in the same period were selected as the control group. The thyroid function [thyroid-stimulating hormone (TSH), three free iodine thyroid former glycine (FT3) and free thyroxine (FT4)], glucose metabolismindex [(FBG), fasting blood glucose level, glycosylated hemoglobin (HbA1C), 2 h postprandial extract elbow venous blood determination of postprandial glucose level 2h (2 HPG), insulin resistance index (HOMA IR)] and renal function (serum creatinine (Cr), serumuric acid (UA), blood urea nitrogen (BUN)] as well as the pregnancy outcome were compared between two groups of patients and the relationship between thyroid function and metabolism of glucose metabolism and renal function was analyzed. Results: The levels of TSH, glucose metabolismand renal function of pregnant women in the hypothyroidismgroup were significantly higher than those in the control group, and FT4 was significantly lower than those in the control group (P<0.05). TSH was positively correlated with each index of glucose metabolism(P< 0.05). FT4 was negatively correlated with all indicators of glucose metabolism (P< 0.05), FT3 was negatively correlated with Cr (P<0.05), and TSH, FT4 were not significantly correlated with Cr, UA, and BUN (P>0.05). The adverse pregnancy outcome rate of hypothyroidism group was 20.00%, significantly higher than that of control group (6.67%, P<0.05). Conclusion: Patients with hypothyroidism during pregnancy have disorders of glucose metabolismand abnormal renal function, which may lead to adverse pregnancy outcomes. [ABSTRACT FROM AUTHOR]

Copyright of Acta Edulis Fungi is the property of Acta Edulis Fungi 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: Western sichuan plateau is one of the regions where kashin-beck disease is relatively concentrated, and low selenium is an important pathogenic factor of kashin-beck disease. OBJECTIVES: It is necessary to explore the geochemical characteristics of selenium in rocks in the study area and to find the influencing factors of low selenium in rocks for the prevention and treatment of kashin-beck disease. METHODS: Atomic fluorescence spectrometry (AFS) was used to study the selenium content in rock samples and core samples from the high incidence area of kashin-beck disease (KBD) in aba area of Western Sichuan Plateau. RESULTS: The selenium content of rocks ranges from 0.03 to 0.43 μg/g, with an average value of 0.09μg/g, which is lower than the crustal abundance of selenium. The content of selenium in different types of rocks is:shale > limestone > slate > sandstone. The selenium content in the rock also showed great differences in different regions:Songpan > Aba > Land Pond > Maerkang > Jiuzhaigou > Ruoergai > Hongyuan, which may be caused by rock type, organic matter and geological environment. The minimum selenium content in each section of the core is 0.02-0.07μg/g, the maximum value is 0.21-0.34μg/g, and the average value is 0.06-0.17μg/g. Moreover, the selenium content of each borehole is significantly lower than that of selenium. CONCLUSIONS: Low selenium in rocks is the main factor causing low selenium in environmental media in Western Sichuan. Meanwhile, the distribution of selenium in rocks is significantly affected by organic matter, lithology and rock compactness. Last but not least, it is of great significance to regulate and improve the living habits of residents in areas with low-selenium environment, increase the import of exogenous high-selenium products and reduce the dependence on the low-selenium environment for the prevention and treatment of KBD. [ABSTRACT FROM AUTHOR]

Copyright of Mycosystema is the property of Mycosystema 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.)

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science 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.)

Through the stability and relevance analysis,by using DUS-test data of 22 rice varieties,this paper discussed the test performance of 11 quantitative traits for DUS. The result showed that various characters variation coefficient were 4. 87 %- 20. 69 %. The variation coefficients of flag leaf width( C5),panicle length( C6),grain length( C8),grain width( C9),unpolished rice length( C10) and unpolished rice width( C11) all had less than 10 %,which meant they were high stability; The remaining 5 characters exceeded 10 %,which showed they were low stability. The Correlation was more different among characters,and the correlation coefficient was- 0. 56 %- 0. 978 %.The correlation coefficient between unpolished rice length( C10) and unpolished rice width( C11) was highest,which was 0. 978; The followed were grain length( C8) and unpolished rice length( C10),grain length( C8) and unpolished rice width( C11),the correlation coefficient were 0. 955 and 0. 938,respectively; And there were higher relevance between grain width( C9) and unpolished rice length( C10),grain width( C9) and unpolished rice width( C11),grain length( C8) and grain width( C9),the correlation coefficient were0. 87,0. 876 and 0. 853,which all were significantly correlated at the level when a = 0. 01. But the correlation coefficient between Length of the reciprocal second leaf blade( C1) and grain width( C9),length of the reciprocal second leaf blade( C1) and unpolished rice width( C11) were lowest,which was- 0. 56. And the average correlation coefficient between each test character and the other 10 test traits was form 0. 1259 to 0. 1345. Relevance and stability of Characters were consistent. If a character had higher relevance with other test-character,it would had higher stability. Five characters,as grain length( C8),unpolished rice width( C11),unpolished rice length( C10),grain width( C9) and flag leaf width( C5),could be used as necessary characters in DUS testing. Because the variation coefficient of them less than 10 %,between 4. 87 %- 7. 81 %; And the correlation coefficient with other traits of them between 0. 1345- 0. 0876. The result showed that a character with high stability and relevance must be with strong test performance; To a character,of which the stability should be stress considered,when stability and relevance were not consistent. Any character with high stability would be with high test performance. It was reasonable that flag leaf width( C5) be used as necessary characters for DUS testing in‘guide’of rice. On the existing basis,in order to enhance scientific nature of ‘guide’,four characters named grain length( C8),unpolished rice width( C11),unpolished rice length( C10) and grain width( C9) should have been used as additionally necessary traits for DUS testing. In view of the high stability,it was rationality that panicle length( C6) had been listed as the traits which must be measured for DUS-testing. Although it had higher correlation with other traits,it was more appropriate that flag leaf length( C4)should have been used as complementary traits,because the stability of which was not good enough. [ABSTRACT FROM AUTHOR]