水稻的花发育是稻米形成的基础,研究水稻花发育的机制具有十分重要的意义。在水稻组培后代中发现一个生殖发育突变体,暂命名为function of reproductive organ(fro1(t)),主要性状为内、外稃片扭曲变形抱合,小穗外形酷似辣椒,但小穗始终...水稻的花发育是稻米形成的基础,研究水稻花发育的机制具有十分重要的意义。在水稻组培后代中发现一个生殖发育突变体,暂命名为function of reproductive organ(fro1(t)),主要性状为内、外稃片扭曲变形抱合,小穗外形酷似辣椒,但小穗始终闭合不开花;副颖多数退化;浆片转变成薄叶状;雄蕊花丝膨大扭曲,花药表面扭曲变形,无花粉,雄蕊个数2～6枚,部分雄蕊转化为底部为叶状,顶部有类似柱头的雌蕊状器官;子房发育正常,但是多数花柱融合,柱头簇生,3～4个。扫描电镜结果显示,决定fro1(t)性状的基因调控着水稻花分生组织的分化及花器官决定的特化。利用图位克隆等技术对基因进行定位,最终将该突变位点定位在水稻8号染色体长臂上InDel0802和RM23432标记之间,目的基因与两个标记的遗传距离分别为0.58cM和1.3cM。据以上结果推测,该基因可能是一个调控水稻各轮花器官发育的新基因。展开更多
Medical ultrasound imaging with Doppler plays an essential role in the diagnosis of vascular disease. This study intended to review the clinical use of "to-and-fro" waveform at duplex Doppler ultrasonography...Medical ultrasound imaging with Doppler plays an essential role in the diagnosis of vascular disease. This study intended to review the clinical use of "to-and-fro" waveform at duplex Doppler ultrasonography(DDU) in the diagnosis of pseudoaneurysms in the arterial vessels of upper and lower extremities, abdominal aorta, carotid and vertebral arteries as well as to review our personal experiences of "to-and-fro" waveform at DDU also. After receiving institutional review board approval, an inclusive literature review was carried out in order to review the scientific foundation of "toand-fro" waveform at DDU and its clinical use in the diagnosis of pseudoaneurysms in various arterial vessels. Articles published in the English language between 2000 and 2013 were evaluated in this review study. Pseudoaneurysms in arterial vessels of the upper and lower extremities, abdominal aorta, carotid and vertebral arteries characterized by an extraluminal pattern of blood flow, which shows variable echogenicity, interval complexity, and "to-and-fro" flow pattern on color Doppler ultrasonography. In these arterial vessels, Duplex ultrasonography can demonstrate the degree of clotting, pseudoaneurysm communication, the blood flow patterns and velocities. Spectral Doppler applied to pseudoaneurysms lumen revealed systolic and diastolic turbulent blood flow with traditional "toand-fro" waveform in the communicating channel. Accurate diagnosis of pseudoaneurysm by spectral Doppler is based on the documentation of the "to-andfro" waveform. The size of pseudoaneurysm determines the appropriate treatment approach as surgical or conservative.展开更多
Plasma Science and Technology(PST)journal assists in advancing plasma science and technology by reporting important,novel,helpful and thought-provoking progress in this strongly multidisciplinary and interdisciplinary...Plasma Science and Technology(PST)journal assists in advancing plasma science and technology by reporting important,novel,helpful and thought-provoking progress in this strongly multidisciplinary and interdisciplinary field,in a timely manner.This field encompasses foundational plasma phenomena;low-temperature plasmas;magnetically confined plasmas;inertially confined plasmas;astrophysics and space plasmas;and interdisciplinary science of these;and the engineering and technology development and application from them.展开更多
Plasma Science and Technology(PST)journal assists in advancing plasma science and technology by reporting important,novel,helpful and thought-provoking progress in this strongly multidisciplinary and interdisciplinary...Plasma Science and Technology(PST)journal assists in advancing plasma science and technology by reporting important,novel,helpful and thought-provoking progress in this strongly multidisciplinary and interdisciplinary field,in a timely manner.This field encompasses foundational plasma phenomena;low-temperature plasmas;magnetically confined plasmas;inertially confined plasmas;astrophysics and space plasmas;and interdisciplinary science of these;and the engineering and technology development and application from them.展开更多
文摘水稻的花发育是稻米形成的基础,研究水稻花发育的机制具有十分重要的意义。在水稻组培后代中发现一个生殖发育突变体,暂命名为function of reproductive organ(fro1(t)),主要性状为内、外稃片扭曲变形抱合,小穗外形酷似辣椒,但小穗始终闭合不开花;副颖多数退化;浆片转变成薄叶状;雄蕊花丝膨大扭曲,花药表面扭曲变形,无花粉,雄蕊个数2～6枚,部分雄蕊转化为底部为叶状,顶部有类似柱头的雌蕊状器官;子房发育正常,但是多数花柱融合,柱头簇生,3～4个。扫描电镜结果显示,决定fro1(t)性状的基因调控着水稻花分生组织的分化及花器官决定的特化。利用图位克隆等技术对基因进行定位,最终将该突变位点定位在水稻8号染色体长臂上InDel0802和RM23432标记之间,目的基因与两个标记的遗传距离分别为0.58cM和1.3cM。据以上结果推测,该基因可能是一个调控水稻各轮花器官发育的新基因。
基金Supported by College of Applied Medical Sciences Research Center and the Deanship of Scientific Research at King Saud University,Riyadh,Saudi Arabia
文摘Medical ultrasound imaging with Doppler plays an essential role in the diagnosis of vascular disease. This study intended to review the clinical use of "to-and-fro" waveform at duplex Doppler ultrasonography(DDU) in the diagnosis of pseudoaneurysms in the arterial vessels of upper and lower extremities, abdominal aorta, carotid and vertebral arteries as well as to review our personal experiences of "to-and-fro" waveform at DDU also. After receiving institutional review board approval, an inclusive literature review was carried out in order to review the scientific foundation of "toand-fro" waveform at DDU and its clinical use in the diagnosis of pseudoaneurysms in various arterial vessels. Articles published in the English language between 2000 and 2013 were evaluated in this review study. Pseudoaneurysms in arterial vessels of the upper and lower extremities, abdominal aorta, carotid and vertebral arteries characterized by an extraluminal pattern of blood flow, which shows variable echogenicity, interval complexity, and "to-and-fro" flow pattern on color Doppler ultrasonography. In these arterial vessels, Duplex ultrasonography can demonstrate the degree of clotting, pseudoaneurysm communication, the blood flow patterns and velocities. Spectral Doppler applied to pseudoaneurysms lumen revealed systolic and diastolic turbulent blood flow with traditional "toand-fro" waveform in the communicating channel. Accurate diagnosis of pseudoaneurysm by spectral Doppler is based on the documentation of the "to-andfro" waveform. The size of pseudoaneurysm determines the appropriate treatment approach as surgical or conservative.
文摘Plasma Science and Technology(PST)journal assists in advancing plasma science and technology by reporting important,novel,helpful and thought-provoking progress in this strongly multidisciplinary and interdisciplinary field,in a timely manner.This field encompasses foundational plasma phenomena;low-temperature plasmas;magnetically confined plasmas;inertially confined plasmas;astrophysics and space plasmas;and interdisciplinary science of these;and the engineering and technology development and application from them.
文摘Plasma Science and Technology(PST)journal assists in advancing plasma science and technology by reporting important,novel,helpful and thought-provoking progress in this strongly multidisciplinary and interdisciplinary field,in a timely manner.This field encompasses foundational plasma phenomena;low-temperature plasmas;magnetically confined plasmas;inertially confined plasmas;astrophysics and space plasmas;and interdisciplinary science of these;and the engineering and technology development and application from them.
