都匀楼梯草 贵州荨麻科一新种

描述了在中国贵州发现的楼梯草属一新种:都匀楼梯草Elatostema duyunense W.T.Wang&Y.G.Wei,本种在亲缘关系上与上林楼梯草E.shanglinense W.T.Wang甚为相近,但根状茎细长,明显,茎较高,叶上面近牙齿顶端处被极短糙伏毛,托叶较大,条形或宽条形,有1条褐色脉,雄花序有短梗,花序托近圆形,明显,苞片6,其中2枚较大,卵状三角形,4枚较小,船状条形,小苞片无毛而与后者不同。     

Rotary torque produced by proton motive force in FoF1 motor

We have attempted direct observation of the light-driven rotation of a FoF(1)-ATP motor. The FoF(1)-ATP motor was co-reconstituted by the deletion-delta subunit of FoF(1)-ATP synthase with bacteriorhodopsins (BRs) into a liposome. The BR converts radiation energy into electrochemical gradient of proton to drive the FoF(1)-ATP motor. Therefore, the light-driven rotation of FoF(1)-ATP motor has been directly observed by a fluorescence microscopy using a fluorescent actin filament connected to beta-subunit as a marker of its orientation. The rotational torque value of the Fo motor was calculated as 27.93+/-1.88pNnm. The ATP motor is expected to be a promising rotary molecular motor in the development of nanodevices.     

Proteomic analysis of testis biopsies in men treated with transient scrotal hyperthermia reveals the potential targets for contraceptive development

Mild testicular heating safely and reversibly suppresses spermatogenesis. In this study, we attempted to clarify the underlying molecular mechanism(s) involved in heat‐induced spermatogenesis suppression in human testis. We conducted global proteomic analyses of human testicular biopsies before, and at 2 and 9 wk after heat treatment. Thirty‐one and Twenty‐six known proteins were identified with significant differential expression at 2 and 9 wk after heat treatment, respectively. These were used to characterize the cellular and molecular events in the testes when seminiferous epithelia became damaged (2 wk) and recovered (9 wk). At 2 wk post‐treatment, the changed expression of a series of proteins could promote apoptosis or suppress proliferation and cell survival. At 9 wk post‐treatment, the changed expression of proteins mainly promoted cell proliferation, differentiation and survival, but resisted cell apoptosis. Among those heat‐regulated proteins, HNRNPH1 was selected for the further functional study. We found that HNRNPH1 was an anti‐apoptosis protein that could regulate the expression of other heat‐induced proteins. In conclusion, heat‐induced reversible suppression of spermatogenesis occurred by modulating the expression of proteins related to proliferation, differentiation, apoptosis and cell survival pathways. These differentially expressed proteins were found to be key molecular targets affecting spermatogenesis after heat treatment.     

带有REV-LTR片段的马立克氏病毒重组野毒株与超强毒株致病性和传播性比较

摘要：【目的】GX0101是一株插入了禽网状内皮组织增生症病毒(REV)-LTR片段的马立克氏病毒（MDV）重组野毒株,本文将其致病性、致肿瘤性和横向传播能力与超强毒参考株（vvMd5）进行比较。【方法】利用MDV特异性核酸探针对同罩饲养的对照鸡的羽毛囊DNA进行检测。【结果】在经抗MDV疫苗免疫的SPF鸡攻毒试验中表明,GX0101株的致死率28.6%和致肿瘤率7.1%均低于超强毒参考株Md5的致死率63.1%和致肿瘤率19.0%。但是,利用MDV特异性核酸探针对同罩饲养的对照鸡的羽毛囊DNA检测表明,     

中国肿足蕨科一新记录属——翼囊蕨属（英文）

报道了中国肿足蕨科一新记录属——翼囊蕨属(Didymochlaena Desv.)。该属为泛热带分布的单型属,在中国为首次记录。本文结合原始文献对该属及其折囊蕨种的特征进行了详细描述。     

Effects of colloidal fouling and gas sparging on microfiltration of yeast suspension

Cross-flow microfiltration is an important step in separating Baker’s yeast (Saccharomyces cerevisiae) from aqueous suspension in many processes. However the permeate flux often declines rapidly due to colloidal fouling of membranes and concentration polarisation. The present work explores the possibility of maintaining acceptable permeate flux by co-current sparging of gas along with the feed, which would scour away colloidal deposits and reduce concentration polarisation of membranes. In this work, both washed and unwashed yeast were used to study the effect of washing to reduce protein fouling of membranes. It was found that permeate flux increased by 45% for liquid throughput of 75 kg/h for a feed concentration of 2.0 kg/m³ of washed yeast as compared with unwashed yeast suspension without gas sparging. For washed yeast suspension, the increase in gas flow rate from 0.5 lpm to 1.5 lpm (30 l/h to 90 l/h) had beneficial effect on permeate flux. It is concluded that in the present case, the gas flow rate should be less than or equal to the liquid flow rate for enhancement of permeates flux.