Color variation among populations is thought to be either due to genetic variation or phenotype plasticity.In this study,we found that an agamid lizard,Phrynocephalus theobaldi,inhabiting elevations greater than any o...Color variation among populations is thought to be either due to genetic variation or phenotype plasticity.In this study,we found that an agamid lizard,Phrynocephalus theobaldi,inhabiting elevations greater than any other reptile,displayed a significantly darker spotted marking on the central ventral abdomen in higher populations than in lower populations.The grey spotted area only occurred in elevations>4200 m,and also increased with increased elevation.The ratio of the size of the dark colored area to the degree of skin luminance/reflectance was used to test whether the lizard has a larger and darker spotted area at higher elevations.This ratio was significantly positively associated with elevation rather than substrate color.The lizard did not display sexual difference in this phenotype.Temperature had a significant influence on the brightness of central abdomen,but temperature-related plasticity of this trait was much smaller than the magnitude of the difference between higher(>4200 m)and lower populations(<4200 m).Common garden experiments showed that genetic inheritance,rather than phenotype plasticity,played a dominant role in this variation.Our research addressed the darkness of a body region that is rarely analyzed because it is shielded from direct insolation.The idea that ventral color could be related to thermoregulation is shown to be worthy of further research.展开更多
A nasal stent capable of preventing adhesions and inflammation is of great value in treating nasal diseases.In order to solve the problems of tissue adhesion and inflammation response,we prepared plasticized bacterial...A nasal stent capable of preventing adhesions and inflammation is of great value in treating nasal diseases.In order to solve the problems of tissue adhesion and inflammation response,we prepared plasticized bacterial cellulose(BCG)and waterborne polyurethane(WPU)composite with antibacterial function used as a novel nasal stent.The gelation behavior of BCG could contribute to protecting the paranasal sinus mucosa;meanwhile,the WPU with improved mechanical property was aimed at supporting the narrow nasal cavity.The thickness,size and the supporting force of the nasal stent could be adjusted according to the specific conditions of the nasal.Thermogravimetric analysis,contact angle and water absorption test were applied to investigate the thermal,hydrophilic and water absorption properties of the composite materials.The composite materials loaded with poly(hexamethylene biguanide)hydrochloride maintained well antibacterial activity over 12days.Animal experiments further revealed that the mucosal epithelium mucosae damage of BCG-WPU composite was minor compared with that of WPU.This new type of drug-loaded nasal stent can effectively address the postoperative adhesions and infections while ensuring the health of nasal mucosal,and thus has an immense clinical application prospects in treating nasal diseases.展开更多
Gain based predistorter (PD) is a highly effective and simple digital baseband predistorter which compensates for the nonlinear distortion of PAs. Lookup table (LUT) is the core of the gain based PD. This paper presen...Gain based predistorter (PD) is a highly effective and simple digital baseband predistorter which compensates for the nonlinear distortion of PAs. Lookup table (LUT) is the core of the gain based PD. This paper presents a discrete Newton’s method based adaptive technique to modify LUT. We simplify and convert the hardship of adaptive updating LUT to the roots finding problem for a system of two element real equations on athematics. And we deduce discrete Newton’s method based adaptive iterative formula used for updating LUT. The iterative formula of the proposed method is in real number field, but secant method previously published is in complex number field. So the proposed method reduces the number of real multiplications and is implemented with ease by hardware. Furthermore, computer simulation results verify gain based PD using discrete Newton’s method could rectify nonlinear distortion and improve system performance. Also, the simulation results reveal the proposed method reaches to the stable statement in fewer iteration times and less runtime than secant method.展开更多
基金supported by the Second Tibetan Plateau Scientific Expedition and Research Program(STEP,Grant No.2019 QZKK0501)the National Natural Science Foundation of China(Grant No.31772447)Zhejiang Natural Science Foundation(LY21C040002)。
文摘Color variation among populations is thought to be either due to genetic variation or phenotype plasticity.In this study,we found that an agamid lizard,Phrynocephalus theobaldi,inhabiting elevations greater than any other reptile,displayed a significantly darker spotted marking on the central ventral abdomen in higher populations than in lower populations.The grey spotted area only occurred in elevations>4200 m,and also increased with increased elevation.The ratio of the size of the dark colored area to the degree of skin luminance/reflectance was used to test whether the lizard has a larger and darker spotted area at higher elevations.This ratio was significantly positively associated with elevation rather than substrate color.The lizard did not display sexual difference in this phenotype.Temperature had a significant influence on the brightness of central abdomen,but temperature-related plasticity of this trait was much smaller than the magnitude of the difference between higher(>4200 m)and lower populations(<4200 m).Common garden experiments showed that genetic inheritance,rather than phenotype plasticity,played a dominant role in this variation.Our research addressed the darkness of a body region that is rarely analyzed because it is shielded from direct insolation.The idea that ventral color could be related to thermoregulation is shown to be worthy of further research.
基金supported by National Natural Science Foundation of China[grant numbers 51973018 and 51773018]Key Research and Development Projects of People’s Liberation Army[grant number BWS17J036]+1 种基金2019 USTB-NTUT Joint Research Program[grant number TW2019005]Fundamental Research Funds for the Central Universities[grant number FRFTP-17-001A2].
文摘A nasal stent capable of preventing adhesions and inflammation is of great value in treating nasal diseases.In order to solve the problems of tissue adhesion and inflammation response,we prepared plasticized bacterial cellulose(BCG)and waterborne polyurethane(WPU)composite with antibacterial function used as a novel nasal stent.The gelation behavior of BCG could contribute to protecting the paranasal sinus mucosa;meanwhile,the WPU with improved mechanical property was aimed at supporting the narrow nasal cavity.The thickness,size and the supporting force of the nasal stent could be adjusted according to the specific conditions of the nasal.Thermogravimetric analysis,contact angle and water absorption test were applied to investigate the thermal,hydrophilic and water absorption properties of the composite materials.The composite materials loaded with poly(hexamethylene biguanide)hydrochloride maintained well antibacterial activity over 12days.Animal experiments further revealed that the mucosal epithelium mucosae damage of BCG-WPU composite was minor compared with that of WPU.This new type of drug-loaded nasal stent can effectively address the postoperative adhesions and infections while ensuring the health of nasal mucosal,and thus has an immense clinical application prospects in treating nasal diseases.
文摘Gain based predistorter (PD) is a highly effective and simple digital baseband predistorter which compensates for the nonlinear distortion of PAs. Lookup table (LUT) is the core of the gain based PD. This paper presents a discrete Newton’s method based adaptive technique to modify LUT. We simplify and convert the hardship of adaptive updating LUT to the roots finding problem for a system of two element real equations on athematics. And we deduce discrete Newton’s method based adaptive iterative formula used for updating LUT. The iterative formula of the proposed method is in real number field, but secant method previously published is in complex number field. So the proposed method reduces the number of real multiplications and is implemented with ease by hardware. Furthermore, computer simulation results verify gain based PD using discrete Newton’s method could rectify nonlinear distortion and improve system performance. Also, the simulation results reveal the proposed method reaches to the stable statement in fewer iteration times and less runtime than secant method.
