Comparative study on different therapies on patients with primary central nervous system lymphoma

Objective

To compare and analyze three therapies on patients with primary central nervous system lymphoma (PCNSL), aiming to provide evidences for future treatment and prognosis.

甘南高山林线岷江冷杉—杜鹃种群结构与动态

高山林线是一种典型的生态交错带,是对气候反映最敏感的地区之一。甘肃南部高山林线区域主要以原始岷江冷杉种群和杜鹃种群为优势种,通过对岷江冷杉和杜鹃种群建立静态生命表,绘制存活曲线描述其结构特征,利用种群数量动态预测时间序列分析定量研究未来的发展趋势。结果显示:(1)岷江冷杉种群幼苗比较丰富,能很好的维持种群个体的自疏死亡,存活曲线呈Deevey-Ⅲ型;杜鹃种群幼苗缺乏,存活曲线趋向于Deevey-Ⅰ型;死亡曲线和危险率曲线都随着龄级的增加而增加,杜鹃种群的死亡率在各个龄级一直大于岷江冷杉种群,危险率在Ⅱ龄级以后杜鹃种群也始终大于岷江冷杉种群。(2)岷江冷杉种群结构动态变化指数Vpi大于修正后的种群结构动态变化指数V′pi且大于0,而杜鹃种群结构动态变化指数Vpi小于修正后的种群结构动态变化指数V′pi且小于0,则岷江冷杉种群属于增长型,杜鹃种群属于衰退型,岷江冷杉、杜鹃随机干扰极大值分别为0.027、0.011,说明二者对外界干扰均比较敏感。(3)杜鹃种群时间序列预测为前期幼苗比较缺乏,中期稳定,后期衰退的动态特征,而岷江冷杉种群表现出各龄级时间变化较小,幼苗个体数较多,种群为稳定增长型,岷江冷杉更能适应甘肃南部高山林线区域当前环境。     

Carbon : nitrogen stoichiometry in forest ecosystems during stand development

Aim Carbon (C) and nitrogen (N) stoichiometry is a critical indicator of biogeochemical coupling in terrestrial ecosystems. However, our current understanding of C : N stoichiometry is mainly derived from observations across space, and little is known about its dynamics through time. Location Global secondary forests. Methods We examined temporal variations in C : N ratios and scaling relationships between N and C for various ecosystem components (i.e. plant tissue, litter, forest floor and mineral soil) using data extracted from 39 chronosequences in forest ecosystems around the world. Results The C : N ratio in plant tissue, litter, forest floor and mineral soil exhibited large variation across various sequences, with an average of 145.8 ± 9.4 (mean ± SE), 49.9 ± 3.0, 38.2 ± 3.1 and 18.5 ± 0.9, respectively. In most sequences, the plant tissue C : N ratio increased significantly with stand age, while the C : N ratio in litter, forest floor and mineral soil remained relatively constant over the age sequence. N and C scaled isometrically (i.e. the slope of the relationship between log‐transformed N and C is not significantly different from 1.0) in litter, forest floor and mineral soil both within and across sequences, but not in plant tissue either within or across sequences. The C : N ratio was larger in coniferous forests than in broadleaf forests and in temperate forests than in tropical forests. In contrast, the N–C scaling slope did not reveal significant differences either between coniferous and broadleaf forests or between temperate and tropical forests. Main conclusions These results suggest that C and N become decoupled in plants but remain coupled in other ecosystem components during stand development.     

SYSTEMATIC REVISION OF THE GENERA LIAGORA AND IZZIELLA (LIAGORACEAE,RHODOPHYTA) FROM TAIWAN BASED ON MOLECULAR ANALYSES AND CARPOSPOROPHYTE DEVELOPMENT,WITH THE DESCRIPTION OF TWO NEW SPECIES1

Some Liagora and Izziella distributed in Taiwan display a wide range of morphological variation and can be difficult to distinguish. To clarify species concepts, we applied DNA sequence analyses and examined carposporophyte development in detail. These studies revealed two new species, which are described herein as Izziella hommersandii sp. nov. and Izziella kuroshioensis sp. nov. I. kuroshioensis superficially resembles Izziella formosana and Izziella orientalis in that its involucral filaments subtend rather than surround the lower portion of the gonimoblast mass (= Izziella type) and a fusion cell is formed from cells of the carpogonial branch, but it can be separated by differences in the cell numbers and branching pattern of the involucral filaments, as well as thallus morphology. In contrast to other species that also bear short lateral branchlets, I. hommersandii is unique in possessing a mixture of short and long involucral filaments, a phenomenon not reported before. The length of the involucral filaments is species specific among species of Izziella and contrasts to the behavior of the involucral filaments after fertilization in species such as “Liagora”setchellii [= Titanophycus setchellii comb. nov.], in which the filaments completely envelop the gonimoblast. In addition, the cells of the carpogonial branch in Titanophycus do not fuse after fertilization to form a fusion cell. Thus, a combination of characters with respect to the behavior of the carpogonial branch and the involucral filaments after fertilization is very useful for delineating species boundaries in Izziella and for separating Titanophycus from Izziella and Liagora.     

Sodium cantharidinate,a novel anti-pancreatic cancer agent that activates functional p53

Science China Life Sciences - Despite the use of many types of chemotherapies for pancreatic cancer, optimal efficacy has not been obtained so far. Pancreatic cancer shows a high incidence of TP53...     

Ⅲ型纤连蛋白组件包含蛋白5通过抑制ERK1/2磷酸化抑制C3H10T1/2细胞成脂分化

旨在探究Ⅲ型纤连蛋白组件包含蛋白5(type Ⅲ domain-containing protein5,FNDC5)对C3H10T1/2细胞成脂分化的调控作用.利用qRT-PCR和Western印迹检测FNDC5在C3H10T1/2细胞成脂分化过程中的时序性表达规律;构建慢病毒包被的过表达/干扰FNDC5载体,转染C3...     

1989—2019年西北地区干燥度指数时空变化及其对气候因子的响应

基于西北地区143个气象站点的气象数据,采用FAO-56 Penman-Monteith公式计算潜在蒸发量,并结合降水量计算西北地区1989—2019年干燥度指数(AI),采用Mann-Kendall趋势分析、小波分析、偏微分方程等方法来揭示其变化趋势、变化周期和气候因子对AI的贡献率。结果表明: 1989—2019年,西北地区AI整体呈不显著的减小趋势,其中,青海呈显著减小趋势,新疆呈不显著的上升趋势;研究区AI在2010年发生了突变,AI变化存在1个17年的主周期。西北地区AI呈现出由东南部向中部、西北部向中部增加的空间格局。西北地区AI变化的倾向率为-1.267·(10 a)^-1,其中,甘肃、宁夏、陕西、青海和新疆AI变化的倾向率分别为-1.17、-0.41、-0.49、-1.77和-2.73·(10 a)^-1。青海小灶火、新疆库尔勒、阿克苏和吐鲁番地区干旱风险发生的可能性较高。降水量和实际水汽压是影响甘肃、宁夏、青海、陕西AI变化的主要气侯因子,影响新疆AI变化的主要气侯因子为潜在蒸散、太阳辐射和平均气温。     

Effect of surgical castration on expression of TRPM8 in urogenital tract of male rats

Trpm8 (melastatin-related transient receptor potential member 8), a member of the transient receptor potential (TRP) superfamily, encoding a cation channel named TRPM8, has been shown to be a primary androgen-responsive gene and play an important role in prostate physiology. To investigate the expression feature of TRPM8 in urogenital tract of male rats, and whether TRPM8 was also regulated by androgen receptor in these organs, male Sprague–Dawley rats were divided into three groups of 35 animals as follows: sham-operated (SHAM), orchidectomized (ORX), orchidectomized plus DHT treatment (O + D). Organs in urogenital tract, including kidney, prostate, seminal vesicle (SV), testis, epididymis and penis, were collected at different post-castration periods. RT-PCR, real-time PCR and Western blotting were used to detect the expression of androgen receptor (AR) and trpm8 in these tissue. As a result, AR and trpm8 can be detected in all these organs at mRNA or/and protein level. The mRNA expression of trpm8 in kidney, prostate, SV and penis decreased 24 or 72 h after castration and kept decreasing in a time-dependant manner. However, treatment of dihydrotestosterone (DHT) could reverse the effect of surgical castration. Collectively, our data provide evidence that TRPM8 and AR were expressed generally in urogenital tract of male rats, and in these organs, expression of trpm8 was regulated by serum androgen.