Seedling stage is an important period for forestry.The aim of this study was to estimate the growth trend of six local precious species and consider their implications for silviculture on forestry.We assessed height,d...Seedling stage is an important period for forestry.The aim of this study was to estimate the growth trend of six local precious species and consider their implications for silviculture on forestry.We assessed height,diameter near ground and crown width at 1,4,6 and 8-month.The variance analysis indicated that there were significant differences between species on all traits except diameter near ground and crown width at 8-month.There were no significant differences on height and crown width at all ages among replicates whereas there were significant differences on diameter near ground at 1 and 4 months,differences on diameter near ground at 6 months and no difference on diameter near ground at 8-month.The significant differences among interaction of species and replicates on diameter near ground at 1-months,4-month,6-month and crown width at 8-month were also found.Dalbergia odorifera had a higher growth period after 6-month.Aquilaria sinensis(Lour.)Spreng,Swietenia mahagoni(L.)Jacq.,Hopea hainanensis Merr.et Chun,Homalium hainanense Gagnep.and Cassia siamea Lam.had the same growth trend on all traits at the whole time.展开更多
Silviculture is the major procedures in forest research.Silviculture is traditionally focused on various aspects of tree planting,such as tree selection,site preparation,irrigation and fertilization and so on,and the ...Silviculture is the major procedures in forest research.Silviculture is traditionally focused on various aspects of tree planting,such as tree selection,site preparation,irrigation and fertilization and so on,and the role of silviculture at that time is to manage forests scientifically for continuous production of goods and services while meeting biological and economic requirements.During the past three decades,an increase in research on silviculture has improved Eucalyptus productivity and on wood properties.But,very little information about this procedure on the review of Eucalyptus grown in China has been published even though this species was introduced many years.This paper reviews the available information regarding research history and progress of silviculture under Chinese ecological conditions and to outline some suggestions to them.展开更多
The purpose is to study the influence of cooking and storage habits on the quality of macadamia nut oil,so as to provide reference for macadamia nut processingenterprises and consumers.Macadamia oil was treated at 100...The purpose is to study the influence of cooking and storage habits on the quality of macadamia nut oil,so as to provide reference for macadamia nut processingenterprises and consumers.Macadamia oil was treated at 100℃,200℃,300℃,microwave heating,45℃constant temperature storage,natural light for different times,and its acid value,peroxide value,squalene,sterol and fatty acid content were detected according to the national standard method.The results showed that the acid value and peroxide value increased with time.The acid value and peroxide value of macadamia oil cooked at 300℃and stored under natural light were higher than those heated by microwave and stored at 45℃,and increased rapidly with the increase of cooking and light time.The acid value was as high as 0.77 mg/g,with an increase of 63.8%,and the peroxide value was as high as 6.18 mg/g,with an increase of 43.7%.As for squalene,it decreased in varying degrees with heating time and storage time.Squalene in macadamia oil cooked at 300℃and stored under natural light were lower than those heated by microwave and stored at 45℃constant temperature,respectively,and decreased rapidly with the increase of cooking and light time,with the reduction ranges of 38.6%and28.4%respectively;Stigmasterol was not detected in macadamia oil.But in macadamia oil the content ofβ-sitosterol was 0.132 g/100 g,and the content did not change significantly in each treatmentgroup.In the experimental treatment group,the content of fatty acids in macadamia oil had different trends.After treatment at 300℃for 20 minutes,the content of oleic acid decreased by 75.66%,the content of palmitic acid decreased by 75.28%,and thecontent of palmitic acid decreased by 74.12%.In conclusion,low temperature heating,microwave heating and storage away from light can better preserve the quality of macadamia oil,this study will provide a theoretical basisfor the rational utilization of macadamia oil as cooking oil.展开更多
In organisms with complex life cycles, such as amphibians, morphological variation is strongly influenced by environmental factors (e.g. temperature) and maternal effects (e.g. diet). Although temperature and food...In organisms with complex life cycles, such as amphibians, morphological variation is strongly influenced by environmental factors (e.g. temperature) and maternal effects (e.g. diet). Although temperature and food level exert a strong influence on larval growth, little is known about the interacting effects of these factors on age and size at metamorphosis. In this study, plasticity in growth rates, survival, larval period, and size at metamorphosis were examined in Rice field Frog (Rana limnocharis) under different combinations of rearing temperature and food level. Rearing temperature did not affect age at metamorphosis, but a significant interaction between temperature and food level revealed that of tadpoles feeding at a high food level, those reared at 32℃ had a shorter length of larval period than those reared at 29℃ or 26℃. Similarly, our results also showed high food level produced a larger growth rate and mass at metamorphosis at 32℃, but not at 29 and 26℃. Therefore, our results revealed that the effects of food level on larval growth and metamorphosis were highly dependent on developmental temperature.展开更多
Objective: To predict the in-hospital incidence of acute respiratory distress syndrome(ARDS) in COVID-19 patients by developing a predictive nomogram.Methods: Patients with COVID-19 admitted to Changsha Public Health ...Objective: To predict the in-hospital incidence of acute respiratory distress syndrome(ARDS) in COVID-19 patients by developing a predictive nomogram.Methods: Patients with COVID-19 admitted to Changsha Public Health Centre between 30 January 2020, and 22 February 2020 were enrolled in this study. Clinical characteristics and laboratory variables were analyzed and compared between patients with or without ARDS. Clinical characteristics and laboratory variables that were risk factors of ARDS were screened by the least absolute shrinkage and selection operator binary logistic regression. Based on risk factors, a prediction model was established by logistic regression and the final nomogram prognostic model was performed. The calibration curve was applied to evaluate the consistency between the nomogram and the ideal observation.Results: A total of 113 patients, including 99 non-ARDS patients and 14 ARDS patients were included in this study. Eight variables including hypertension, chronic obstructive pulmonary disease, cough, lactate dehydrogenase, creatine kinase, white blood count, body temperature, and heart rate were included in the model. The area under receiver operating characteristic curve, specificity, sensitivity, and accuracy of the full model were 0.969, 1.000, 0.857, and 0.875, respectively. The calibration curve also showed good agreement between the predicted and observed values in the model.Conclusions: The nomogram can be used to predict the in-hospital incidence of ARDS in COVID-19 patients.展开更多
文摘Seedling stage is an important period for forestry.The aim of this study was to estimate the growth trend of six local precious species and consider their implications for silviculture on forestry.We assessed height,diameter near ground and crown width at 1,4,6 and 8-month.The variance analysis indicated that there were significant differences between species on all traits except diameter near ground and crown width at 8-month.There were no significant differences on height and crown width at all ages among replicates whereas there were significant differences on diameter near ground at 1 and 4 months,differences on diameter near ground at 6 months and no difference on diameter near ground at 8-month.The significant differences among interaction of species and replicates on diameter near ground at 1-months,4-month,6-month and crown width at 8-month were also found.Dalbergia odorifera had a higher growth period after 6-month.Aquilaria sinensis(Lour.)Spreng,Swietenia mahagoni(L.)Jacq.,Hopea hainanensis Merr.et Chun,Homalium hainanense Gagnep.and Cassia siamea Lam.had the same growth trend on all traits at the whole time.
文摘Silviculture is the major procedures in forest research.Silviculture is traditionally focused on various aspects of tree planting,such as tree selection,site preparation,irrigation and fertilization and so on,and the role of silviculture at that time is to manage forests scientifically for continuous production of goods and services while meeting biological and economic requirements.During the past three decades,an increase in research on silviculture has improved Eucalyptus productivity and on wood properties.But,very little information about this procedure on the review of Eucalyptus grown in China has been published even though this species was introduced many years.This paper reviews the available information regarding research history and progress of silviculture under Chinese ecological conditions and to outline some suggestions to them.
基金Science and Technology Project of Guangdong Forestry Society,Grant/Award Number:2020-GDFS-KJ-05Guangzhou Science and Technology Project,Grant/Award Number:202201011039Guangdong Science and Technology plan project,Grant/Award Number:2023B0208010001.
文摘The purpose is to study the influence of cooking and storage habits on the quality of macadamia nut oil,so as to provide reference for macadamia nut processingenterprises and consumers.Macadamia oil was treated at 100℃,200℃,300℃,microwave heating,45℃constant temperature storage,natural light for different times,and its acid value,peroxide value,squalene,sterol and fatty acid content were detected according to the national standard method.The results showed that the acid value and peroxide value increased with time.The acid value and peroxide value of macadamia oil cooked at 300℃and stored under natural light were higher than those heated by microwave and stored at 45℃,and increased rapidly with the increase of cooking and light time.The acid value was as high as 0.77 mg/g,with an increase of 63.8%,and the peroxide value was as high as 6.18 mg/g,with an increase of 43.7%.As for squalene,it decreased in varying degrees with heating time and storage time.Squalene in macadamia oil cooked at 300℃and stored under natural light were lower than those heated by microwave and stored at 45℃constant temperature,respectively,and decreased rapidly with the increase of cooking and light time,with the reduction ranges of 38.6%and28.4%respectively;Stigmasterol was not detected in macadamia oil.But in macadamia oil the content ofβ-sitosterol was 0.132 g/100 g,and the content did not change significantly in each treatmentgroup.In the experimental treatment group,the content of fatty acids in macadamia oil had different trends.After treatment at 300℃for 20 minutes,the content of oleic acid decreased by 75.66%,the content of palmitic acid decreased by 75.28%,and thecontent of palmitic acid decreased by 74.12%.In conclusion,low temperature heating,microwave heating and storage away from light can better preserve the quality of macadamia oil,this study will provide a theoretical basisfor the rational utilization of macadamia oil as cooking oil.
基金funded by Program for Innovative Research Team (in Science and Technology) in universities of Henan Province (Grant No.17IRTSTHN019)Henan Scientific and Technological Project (Grant No.162102310124)
文摘In organisms with complex life cycles, such as amphibians, morphological variation is strongly influenced by environmental factors (e.g. temperature) and maternal effects (e.g. diet). Although temperature and food level exert a strong influence on larval growth, little is known about the interacting effects of these factors on age and size at metamorphosis. In this study, plasticity in growth rates, survival, larval period, and size at metamorphosis were examined in Rice field Frog (Rana limnocharis) under different combinations of rearing temperature and food level. Rearing temperature did not affect age at metamorphosis, but a significant interaction between temperature and food level revealed that of tadpoles feeding at a high food level, those reared at 32℃ had a shorter length of larval period than those reared at 29℃ or 26℃. Similarly, our results also showed high food level produced a larger growth rate and mass at metamorphosis at 32℃, but not at 29 and 26℃. Therefore, our results revealed that the effects of food level on larval growth and metamorphosis were highly dependent on developmental temperature.
基金Key Research and Development Program of Hunan Province (NO. 2020SK3004)Emergency Project of Prevention and Control for COVID-19 of Central South University (No. 160260005)。
文摘Objective: To predict the in-hospital incidence of acute respiratory distress syndrome(ARDS) in COVID-19 patients by developing a predictive nomogram.Methods: Patients with COVID-19 admitted to Changsha Public Health Centre between 30 January 2020, and 22 February 2020 were enrolled in this study. Clinical characteristics and laboratory variables were analyzed and compared between patients with or without ARDS. Clinical characteristics and laboratory variables that were risk factors of ARDS were screened by the least absolute shrinkage and selection operator binary logistic regression. Based on risk factors, a prediction model was established by logistic regression and the final nomogram prognostic model was performed. The calibration curve was applied to evaluate the consistency between the nomogram and the ideal observation.Results: A total of 113 patients, including 99 non-ARDS patients and 14 ARDS patients were included in this study. Eight variables including hypertension, chronic obstructive pulmonary disease, cough, lactate dehydrogenase, creatine kinase, white blood count, body temperature, and heart rate were included in the model. The area under receiver operating characteristic curve, specificity, sensitivity, and accuracy of the full model were 0.969, 1.000, 0.857, and 0.875, respectively. The calibration curve also showed good agreement between the predicted and observed values in the model.Conclusions: The nomogram can be used to predict the in-hospital incidence of ARDS in COVID-19 patients.