为了研究引起水稻叶片卷曲的分子机理,鉴定出新的水稻卷叶基因.用60Co-γ射线辐射诱变籼稻品种镇恢084,获得一份卷叶矮化突变体材料,命名为rld(rolling leaf and dwarf).通过形态学分析水稻表型,石蜡切片观察叶片细胞组织形态,图位克隆...为了研究引起水稻叶片卷曲的分子机理,鉴定出新的水稻卷叶基因.用60Co-γ射线辐射诱变籼稻品种镇恢084,获得一份卷叶矮化突变体材料,命名为rld(rolling leaf and dwarf).通过形态学分析水稻表型,石蜡切片观察叶片细胞组织形态,图位克隆和测序技术进行精细定位和确定目的基因,生物信息学分析蛋白序列结构.结果显示:rld突变体叶片极度内卷,株高降低,穗长变短,结实率降低;rld突变体叶片维管束间的下表皮叶肉细胞面积增大;rld基因精细定位在标记Indel2和Indel5间的32.3kb的物理区间,测序发现rld是调控卷叶基因RL9的一个新等位基因,由于外显子上精氨酸缺失引起rld基因编码的蛋白空间结构发生改变.推测精氨酸在RL9蛋白的正常功能行使过程中是必要的,对维持水稻叶片表型具有至关重要的作用.展开更多
间作在我国农业发展中有重要的作用,合理的间作通过竞争或促进原理,有效分配资源,提高土地利用率和作物产量。在灌溉条件下于北疆石河子地区进行试验,试验设计三种不同的种植模式:油莎豆单作(TT),大豆单作(SS),油莎豆||大豆(T||S),分别...间作在我国农业发展中有重要的作用,合理的间作通过竞争或促进原理,有效分配资源,提高土地利用率和作物产量。在灌溉条件下于北疆石河子地区进行试验,试验设计三种不同的种植模式:油莎豆单作(TT),大豆单作(SS),油莎豆||大豆(T||S),分别对作物生长动态、作物产量、根系分布特征等几方面进行分析,为发展高产、生态农业提供科学理论依据。结果表明:间作使油莎豆株高降低6%~27.45%,变化趋势相似,SPAD值增加,0~20 cm RLD值增幅为204.76%,20~40 cmRLD值增幅为80.95%;间作使大豆株高提升3.81%~40.00%,SPAD值增加,0~20 cm RLD值增幅为117.76%,20~40 cm RLD增幅为54.55%。油莎豆和大豆间作的土地当量比LER=2.24>1,具有间作优势,增产率为123.63%,最终得出间作优势来源于大豆的固氮作用。展开更多
我们仿效BBC的广播节目"60秒改进世界"(Sixty Second Idea to Improve the World)推出了"改进建筑60秒"栏目,每期将在世界范围内采访两位人物,请他们就建筑、城市、景观、技术等相关问题在60秒的时间里讲出一个或...我们仿效BBC的广播节目"60秒改进世界"(Sixty Second Idea to Improve the World)推出了"改进建筑60秒"栏目,每期将在世界范围内采访两位人物,请他们就建筑、城市、景观、技术等相关问题在60秒的时间里讲出一个或两个有启发性、批判性甚至有争议性的观点。本栏目如实记录了他们的话,采访所拍摄的视频将会出现在我们的相关网页上。所述观点只代表嘉宾本人,与本杂志立场无关。展开更多
Since the solvent evaporation of a droplet on a hydrophobically pretreated glass slide, femtomole amount of fluorescent materials is carried by the evaporation and results in outward capillary flow to the perimeter of...Since the solvent evaporation of a droplet on a hydrophobically pretreated glass slide, femtomole amount of fluorescent materials is carried by the evaporation and results in outward capillary flow to the perimeter of the droplet spot where the solute deposits, and forms a fluorescent ring like deposit (RLD) with submicrometer-scale structures.展开更多
Ensuring the secure transmission of secret messages,particularly through video—one of the most widely used media formats—is a critical challenge in the field of information security.Relying on a single-layered secur...Ensuring the secure transmission of secret messages,particularly through video—one of the most widely used media formats—is a critical challenge in the field of information security.Relying on a single-layered security approach is often insufficient for safeguarding sensitive data.This study proposes a triple-lightweight cryptographic and steganographic model that integrates the Hill Cipher Technique(HCT),Rotation Left Digits(RLD),and Discrete Wavelet Transform(DWT)to embed secret messages within video frames securely.The approach begins with encrypting the secret text using a private key matrix(PK^(1))of size 2×2 up to 6×6 via HCT.A second encryption layer is applied using a dynamic private key(PK2)derived from the RGB pixel values of the video frame,resulting in a rotated cipher.The doubly encrypted message is then embedded into the video frames using the DWT method.Upon transmission,the concealed message is extracted using inverse DWT and decrypted in two steps—first with PK2 and then with the inverse of PK^(1).Experiments conducted using MPEG video sequences and message lengths ranging from 10 to 300 bytes demonstrate strong performance in terms of Mean Square Error(MSE),Peak Signal-to-Noise Ratio(PSNR),and Correlation Coefficient(CC)between original and encrypted messages.The similarity between original and stego frames is further validated using Structural Similarity Index(SSIM),Mean Absolute Error(MAE),Number of Pixel Change Rate(NPCR),and Unified Average Changing Intensity(UACI).Results confirm that utilizing video frames to generate PK2 offers superior security compared to static key images.Moreover,the indistinguishability between original and stego frames highlights the method’s robustness against visual and statistical attacks.展开更多
文摘为了研究引起水稻叶片卷曲的分子机理,鉴定出新的水稻卷叶基因.用60Co-γ射线辐射诱变籼稻品种镇恢084,获得一份卷叶矮化突变体材料,命名为rld(rolling leaf and dwarf).通过形态学分析水稻表型,石蜡切片观察叶片细胞组织形态,图位克隆和测序技术进行精细定位和确定目的基因,生物信息学分析蛋白序列结构.结果显示:rld突变体叶片极度内卷,株高降低,穗长变短,结实率降低;rld突变体叶片维管束间的下表皮叶肉细胞面积增大;rld基因精细定位在标记Indel2和Indel5间的32.3kb的物理区间,测序发现rld是调控卷叶基因RL9的一个新等位基因,由于外显子上精氨酸缺失引起rld基因编码的蛋白空间结构发生改变.推测精氨酸在RL9蛋白的正常功能行使过程中是必要的,对维持水稻叶片表型具有至关重要的作用.
文摘间作在我国农业发展中有重要的作用,合理的间作通过竞争或促进原理,有效分配资源,提高土地利用率和作物产量。在灌溉条件下于北疆石河子地区进行试验,试验设计三种不同的种植模式:油莎豆单作(TT),大豆单作(SS),油莎豆||大豆(T||S),分别对作物生长动态、作物产量、根系分布特征等几方面进行分析,为发展高产、生态农业提供科学理论依据。结果表明:间作使油莎豆株高降低6%~27.45%,变化趋势相似,SPAD值增加,0~20 cm RLD值增幅为204.76%,20~40 cmRLD值增幅为80.95%;间作使大豆株高提升3.81%~40.00%,SPAD值增加,0~20 cm RLD值增幅为117.76%,20~40 cm RLD增幅为54.55%。油莎豆和大豆间作的土地当量比LER=2.24>1,具有间作优势,增产率为123.63%,最终得出间作优势来源于大豆的固氮作用。
文摘我们仿效BBC的广播节目"60秒改进世界"(Sixty Second Idea to Improve the World)推出了"改进建筑60秒"栏目,每期将在世界范围内采访两位人物,请他们就建筑、城市、景观、技术等相关问题在60秒的时间里讲出一个或两个有启发性、批判性甚至有争议性的观点。本栏目如实记录了他们的话,采访所拍摄的视频将会出现在我们的相关网页上。所述观点只代表嘉宾本人,与本杂志立场无关。
文摘Since the solvent evaporation of a droplet on a hydrophobically pretreated glass slide, femtomole amount of fluorescent materials is carried by the evaporation and results in outward capillary flow to the perimeter of the droplet spot where the solute deposits, and forms a fluorescent ring like deposit (RLD) with submicrometer-scale structures.
文摘Ensuring the secure transmission of secret messages,particularly through video—one of the most widely used media formats—is a critical challenge in the field of information security.Relying on a single-layered security approach is often insufficient for safeguarding sensitive data.This study proposes a triple-lightweight cryptographic and steganographic model that integrates the Hill Cipher Technique(HCT),Rotation Left Digits(RLD),and Discrete Wavelet Transform(DWT)to embed secret messages within video frames securely.The approach begins with encrypting the secret text using a private key matrix(PK^(1))of size 2×2 up to 6×6 via HCT.A second encryption layer is applied using a dynamic private key(PK2)derived from the RGB pixel values of the video frame,resulting in a rotated cipher.The doubly encrypted message is then embedded into the video frames using the DWT method.Upon transmission,the concealed message is extracted using inverse DWT and decrypted in two steps—first with PK2 and then with the inverse of PK^(1).Experiments conducted using MPEG video sequences and message lengths ranging from 10 to 300 bytes demonstrate strong performance in terms of Mean Square Error(MSE),Peak Signal-to-Noise Ratio(PSNR),and Correlation Coefficient(CC)between original and encrypted messages.The similarity between original and stego frames is further validated using Structural Similarity Index(SSIM),Mean Absolute Error(MAE),Number of Pixel Change Rate(NPCR),and Unified Average Changing Intensity(UACI).Results confirm that utilizing video frames to generate PK2 offers superior security compared to static key images.Moreover,the indistinguishability between original and stego frames highlights the method’s robustness against visual and statistical attacks.
