The objective of this work was to carry out a morphological characterization of arbuscular mycorrhizal fungi in the rhizosphere of Xanthosoma sagittifolium L. Schott plants. The plant material used was the white and r...The objective of this work was to carry out a morphological characterization of arbuscular mycorrhizal fungi in the rhizosphere of Xanthosoma sagittifolium L. Schott plants. The plant material used was the white and red cultivars of X. sagittifolium, belonging to age intervals of 3 - 6, 6 - 9, and 9 - 12 months. Three harvest sites were chosen in the Central Region of Cameroon. In each site, soil from the rhizosphere and plant roots was collected in a randomized manner. In the field, the agronomic parameters were evaluated. The physicochemical characteristics of the soils, the mycorrhization index, and the morphological characterization of the mycorrhizal types of each site were carried out. The results obtained show that the agronomic growth parameters varied significantly using the Student Newman and Keuls Test depending on the harvest sites. The soils’ pH in all sites was acidic and ranged between 4.6 and 5.8. The Nkometou site has a loamy texture while the Olembe and Soa sites have loam-clay-sandy and loam-clay textures respectively. The highest mycorrhization frequencies appeared at the Nkometou site, with 75 and 87.33% of the white and red cultivars plant roots at 6 - 9 and 3 - 6 months. The relative abundance of AMF arbuscular mycorrhizal fungal spores in the rhizosphere of X. sagittifolium plants varied with age and cultivar. There were 673 spores between 9 - 12 months in Nkometou in the red cultivar. Six AMF genera were identified in all the different soils collected: Acaulospora sp., Funneliformis sp., Gigaspora sp., Glomus sp., Scutellospora sp., and Septoglomus sp. The genus Glomus sp. was the most present at all age intervals in both cultivars.展开更多
Taro （Colocasia esculenta L. Schott） is an important underutilised crop in South Africa, East Africa and Indonesia. Three taro landraces, namely, Dumbe Lomfula （wild）, KwaNgwanase and Umbumbulu, were collected fro...Taro （Colocasia esculenta L. Schott） is an important underutilised crop in South Africa, East Africa and Indonesia. Three taro landraces, namely, Dumbe Lomfula （wild）, KwaNgwanase and Umbumbulu, were collected from two locations in KwaZulu-Natal （KZN）, South Africa, and planted at two locations, Pietermaritzburg （KZN） and Roodeplaat, Pretoria. Ago-morphological characterisation of vegetative and corm characteristics were done four months after planting and at harvest, respectively. Sampling for DNA fingerprinting using five SSR primers was done using leaf material four months after planting. Agro-morphological characterisation was useful in showing differences between the wild landrace and the two cultivated landraces, as well as identification of dasheen and eddoe types. SSR primer characterisation showed that despite significant morphological difference, the wild Dumbe Lomfula and Umbumbulu landraces were closely related but different from the KwaNgwanase landrace. Although landraces showed great morphological variation, this did not necessarily imply genetic variation. It is concluded that SSR primers are more useful for characterising taro landraces.展开更多
SCHOTT公司的Tubing Business Segment推出两种新型璃型产品：8688(基于钨)和8271(kovar)。两种型号都具有特殊UV屏蔽效果，以防止塑料元件过早老化。造成塑料元件损伤的UV辐射是波长在254nm和313nm之间的不可见光。两种玻璃产品据称是...SCHOTT公司的Tubing Business Segment推出两种新型璃型产品：8688(基于钨)和8271(kovar)。两种型号都具有特殊UV屏蔽效果，以防止塑料元件过早老化。造成塑料元件损伤的UV辐射是波长在254nm和313nm之间的不可见光。两种玻璃产品据称是第一种在玻璃结构中融入有效UV滤光器的产品、而且滤光波长正好落在这一范围的产品，因此在后续阶段无需添加复杂涂层。展开更多
A traditional process used by farmers in Chad consists in soaking slices of taro (Colocasia esculenta L. SCHOTT) in tamarind infusion, or in corn solution or in water over a 24-hour period to reduce the acridity of ta...A traditional process used by farmers in Chad consists in soaking slices of taro (Colocasia esculenta L. SCHOTT) in tamarind infusion, or in corn solution or in water over a 24-hour period to reduce the acridity of taro and facilitate cooking. The aim of this study was to assess the effect of traditional soaking on the in vitro digestibility of taro flour using or not using an α-amylase enzyme. The digestion without the enzyme has shown that the soaking processes improve the digestibility of taro flour (from 39.30% for the control sample to 75.11% (after tamarind infusion) and 78.67% (treatment with water) after 24 hours of soaking). Soaking over a 6-hour period and preferentially in tamarind infusion or in corn solution obtains highly digestible flour (around 95% of digestibility rate after 3 hours of enzymatic digestion).展开更多
This design is presented of a 2 × 2 planar array, with a half-wave dipole antenna to be its element, on a new substrate material, Schott Borofloat, with CMOS technology in the 60 GHz band. In the proposed structu...This design is presented of a 2 × 2 planar array, with a half-wave dipole antenna to be its element, on a new substrate material, Schott Borofloat, with CMOS technology in the 60 GHz band. In the proposed structure, all the designs are based on the CMOS technology and similar performance could be achieved with the same size in contrast to the design on low-temperature co-fired ceramic （LTCC）. This could lead to the improving of the compatibility with the CMOS IC process, the design cost and the design precision which is restricted in the LTCC process. The simulated-10 dB bandwidth of the array is from 58 to 64 GHz. A peak gain of 9.4 dBi is achieved. Good agreement on return loss is achieved between simulations and measurements.展开更多
研究石菖蒲和α-细辛醚抵抗大鼠疲劳运动后学习记忆下降的RGS14/MEK/ERK信号通路作用机制。80只SD大鼠按完全随机法分为:正常组(normal,Nor)、运动组(exercise,E)、运动+石菖蒲组(exercise+Acorus tatarinowii Schott,EAT)、运动+α-细...研究石菖蒲和α-细辛醚抵抗大鼠疲劳运动后学习记忆下降的RGS14/MEK/ERK信号通路作用机制。80只SD大鼠按完全随机法分为:正常组(normal,Nor)、运动组(exercise,E)、运动+石菖蒲组(exercise+Acorus tatarinowii Schott,EAT)、运动+α-细辛醚组(exercise+α-asarone,EαA)、运动+石菖蒲+RGS14拮抗剂CCG-63802组(EATC)、运动+α-细辛醚+RGS14拮抗剂CCG-63802(EαAR)、运动+石菖蒲+MEK拮抗剂U0126组(EATU)、运动+α-细辛醚+MEK拮抗剂U0126组(EαAU),每组10只。开展水迷宫实验进行学习记忆检测;利用免疫组化、免疫印迹(Western blot)和荧光实时定量PCR(RT-PCR)等方法检测G蛋白信号调节蛋白14(regulator of G protein signaling 14,RGS14)、Raf-1、磷酸化丝裂原活化蛋白激酶激酶(phosphorylated mitogen-activated protein kinase kinase,p-MEK)和磷酸化细胞外信号调节激酶1/2(phosphorylated extracellular signal-regulated kinase 1/2,p-ERK1/2)表达水平。结果表明EAT和EαA组大鼠逃避潜伏期显著低于E组;穿越平台次数显著高于E组(P<0.01)。EATC和EαAR组大鼠逃避潜伏期最短,穿越平台次数最多(P<0.01)。EATU和EαAU大鼠逃避潜伏期最长,穿越平台次数最少(P<0.01)。EAT和EαA组RGS14蛋白和mRNA表达水平显著低于E组,Raf-1、p-MEK和p-ERK1/2表达水平则显著高于E组(P<0.01)。EATC和EαAR组RGS14蛋白和mRNA表达水平最低,显著低于其他各组,Raf-1、p-MEK和p-ERK1/2表达水平最高,显著高于其他各组(P<0.01或P<0.05)。EATU和EαAU组p-MEK、p-ERK1/2表达水平最低,显著低于其他各组(P<0.01)。以上实验结果表明石菖蒲和α-细辛醚能够基于对海马RGS14/MEK/ERK信号通路的调节,从而显著提高疲劳运动大鼠的学习记忆。展开更多
文摘The objective of this work was to carry out a morphological characterization of arbuscular mycorrhizal fungi in the rhizosphere of Xanthosoma sagittifolium L. Schott plants. The plant material used was the white and red cultivars of X. sagittifolium, belonging to age intervals of 3 - 6, 6 - 9, and 9 - 12 months. Three harvest sites were chosen in the Central Region of Cameroon. In each site, soil from the rhizosphere and plant roots was collected in a randomized manner. In the field, the agronomic parameters were evaluated. The physicochemical characteristics of the soils, the mycorrhization index, and the morphological characterization of the mycorrhizal types of each site were carried out. The results obtained show that the agronomic growth parameters varied significantly using the Student Newman and Keuls Test depending on the harvest sites. The soils’ pH in all sites was acidic and ranged between 4.6 and 5.8. The Nkometou site has a loamy texture while the Olembe and Soa sites have loam-clay-sandy and loam-clay textures respectively. The highest mycorrhization frequencies appeared at the Nkometou site, with 75 and 87.33% of the white and red cultivars plant roots at 6 - 9 and 3 - 6 months. The relative abundance of AMF arbuscular mycorrhizal fungal spores in the rhizosphere of X. sagittifolium plants varied with age and cultivar. There were 673 spores between 9 - 12 months in Nkometou in the red cultivar. Six AMF genera were identified in all the different soils collected: Acaulospora sp., Funneliformis sp., Gigaspora sp., Glomus sp., Scutellospora sp., and Septoglomus sp. The genus Glomus sp. was the most present at all age intervals in both cultivars.
文摘Taro （Colocasia esculenta L. Schott） is an important underutilised crop in South Africa, East Africa and Indonesia. Three taro landraces, namely, Dumbe Lomfula （wild）, KwaNgwanase and Umbumbulu, were collected from two locations in KwaZulu-Natal （KZN）, South Africa, and planted at two locations, Pietermaritzburg （KZN） and Roodeplaat, Pretoria. Ago-morphological characterisation of vegetative and corm characteristics were done four months after planting and at harvest, respectively. Sampling for DNA fingerprinting using five SSR primers was done using leaf material four months after planting. Agro-morphological characterisation was useful in showing differences between the wild landrace and the two cultivated landraces, as well as identification of dasheen and eddoe types. SSR primer characterisation showed that despite significant morphological difference, the wild Dumbe Lomfula and Umbumbulu landraces were closely related but different from the KwaNgwanase landrace. Although landraces showed great morphological variation, this did not necessarily imply genetic variation. It is concluded that SSR primers are more useful for characterising taro landraces.
文摘SCHOTT公司的Tubing Business Segment推出两种新型璃型产品：8688(基于钨)和8271(kovar)。两种型号都具有特殊UV屏蔽效果，以防止塑料元件过早老化。造成塑料元件损伤的UV辐射是波长在254nm和313nm之间的不可见光。两种玻璃产品据称是第一种在玻璃结构中融入有效UV滤光器的产品、而且滤光波长正好落在这一范围的产品，因此在后续阶段无需添加复杂涂层。
基金grateful to Chad French Ambassy for the financing of this project.
文摘A traditional process used by farmers in Chad consists in soaking slices of taro (Colocasia esculenta L. SCHOTT) in tamarind infusion, or in corn solution or in water over a 24-hour period to reduce the acridity of taro and facilitate cooking. The aim of this study was to assess the effect of traditional soaking on the in vitro digestibility of taro flour using or not using an α-amylase enzyme. The digestion without the enzyme has shown that the soaking processes improve the digestibility of taro flour (from 39.30% for the control sample to 75.11% (after tamarind infusion) and 78.67% (treatment with water) after 24 hours of soaking). Soaking over a 6-hour period and preferentially in tamarind infusion or in corn solution obtains highly digestible flour (around 95% of digestibility rate after 3 hours of enzymatic digestion).
文摘This design is presented of a 2 × 2 planar array, with a half-wave dipole antenna to be its element, on a new substrate material, Schott Borofloat, with CMOS technology in the 60 GHz band. In the proposed structure, all the designs are based on the CMOS technology and similar performance could be achieved with the same size in contrast to the design on low-temperature co-fired ceramic （LTCC）. This could lead to the improving of the compatibility with the CMOS IC process, the design cost and the design precision which is restricted in the LTCC process. The simulated-10 dB bandwidth of the array is from 58 to 64 GHz. A peak gain of 9.4 dBi is achieved. Good agreement on return loss is achieved between simulations and measurements.
文摘研究石菖蒲和α-细辛醚抵抗大鼠疲劳运动后学习记忆下降的RGS14/MEK/ERK信号通路作用机制。80只SD大鼠按完全随机法分为:正常组(normal,Nor)、运动组(exercise,E)、运动+石菖蒲组(exercise+Acorus tatarinowii Schott,EAT)、运动+α-细辛醚组(exercise+α-asarone,EαA)、运动+石菖蒲+RGS14拮抗剂CCG-63802组(EATC)、运动+α-细辛醚+RGS14拮抗剂CCG-63802(EαAR)、运动+石菖蒲+MEK拮抗剂U0126组(EATU)、运动+α-细辛醚+MEK拮抗剂U0126组(EαAU),每组10只。开展水迷宫实验进行学习记忆检测;利用免疫组化、免疫印迹(Western blot)和荧光实时定量PCR(RT-PCR)等方法检测G蛋白信号调节蛋白14(regulator of G protein signaling 14,RGS14)、Raf-1、磷酸化丝裂原活化蛋白激酶激酶(phosphorylated mitogen-activated protein kinase kinase,p-MEK)和磷酸化细胞外信号调节激酶1/2(phosphorylated extracellular signal-regulated kinase 1/2,p-ERK1/2)表达水平。结果表明EAT和EαA组大鼠逃避潜伏期显著低于E组;穿越平台次数显著高于E组(P<0.01)。EATC和EαAR组大鼠逃避潜伏期最短,穿越平台次数最多(P<0.01)。EATU和EαAU大鼠逃避潜伏期最长,穿越平台次数最少(P<0.01)。EAT和EαA组RGS14蛋白和mRNA表达水平显著低于E组,Raf-1、p-MEK和p-ERK1/2表达水平则显著高于E组(P<0.01)。EATC和EαAR组RGS14蛋白和mRNA表达水平最低,显著低于其他各组,Raf-1、p-MEK和p-ERK1/2表达水平最高,显著高于其他各组(P<0.01或P<0.05)。EATU和EαAU组p-MEK、p-ERK1/2表达水平最低,显著低于其他各组(P<0.01)。以上实验结果表明石菖蒲和α-细辛醚能够基于对海马RGS14/MEK/ERK信号通路的调节,从而显著提高疲劳运动大鼠的学习记忆。
