Coffee and tea consumption during pregnancy and risk of childhood acute myeloid leukemia: A Childhood Leukemia International Consortium (CLIC) study

BackgroundDietary habits during pregnancy have been inconsistently linked to childhood acute myeloid leukemia (AML), given the putative intrauterine onset of the disease as a result of triggering events during the critical period of fetal hematopoiesis. We investigated the potential association of maternal coffee and tea consumption during pregnancy with childhood AML risk, pooling primary data from eight case-control studies participating in the Childhood Leukemia International Consortium.MethodsInformation on coffee and/or tea consumption was available for 444 cases and 1255 age- and sex-matched controls, on coffee consumption for 318 cases and 971 controls and on tea consumption for 388 cases and 932 controls. Categories for cups of daily coffee/tea consumption were created in order to explore potential dose-response associations. Pooled odds ratios (ORs) and 95% confidence intervals (CIs) were estimated using logistic regression.ResultsAssociations were found neither in the analysis on coffee or tea nor in the analysis on coffee only consumption (any versus no). A positive association with increasing coffee intake was observed (>1 cup per day; OR: 1.40, 95% CI: 1.03–1.92, increment of one cup per day; OR: 1.18, 95% CI: 1.01–1.39). No associations were observed with tea consumption. Interaction analyses showed non-significant associations between coffee/tea and smoking. Hyperdiploidy was inversely associated with tea consumption, with other cytogenetic markers having no association with coffee/tea.ConclusionGiven the widespread consumption of caffeinated beverages among pregnant women, our finding is of important public health relevance, suggesting adverse effects of maternal coffee consumption during pregnancy in the offspring.     

红茶,青茶,黑茶抗人轮状病毒的实验研究

采用病变抑制法在细胞培养上测定了红茶、青茶、黑茶对人轮状病毒的抑制作用。试验结果表明,红茶和青茶茶汤(2克茶叶用25ml沸水浸泡)在1:1000的稀释浓度时,可以完全抑制病毒,而黑茶茶汤在1:100时才能完全抑制病毒。试验结果还表明,茶汤在高浓度时具有细胞毒作用。     

丛栽茶树树冠小气候及其对新梢生育和生化成分的影响

1 引言 为了获得优质高产的茶叶,需通过修剪养蓬等方法,使茶树形成宽广而整齐的树冠。丛栽茶树的树冠多呈馒头形,由于方位不同,形成了树冠内光、温、湿、风等因子的差异,因而影响了茶树的物候期及生理生化变化。因此,探讨树冠小气候特征及其对茶树新梢生育和生化成分的影响,在理论和生产实践上均有意义。有关这方面研究已有一些报道,但对茶树树冠小气候特征及其茶树新梢生育和品质成分的影响尚未见报     

安徽省茶园蜘蛛名录

报道了安徽省茶园蜘蛛的部分种类,计有22科68属118种。     

Ionic conditions affecting the release and absorption of an alkaline protease associated with the occlusion bodies of insect baculoviruses

Nearly all of the alkaline protease found in the occlusion bodies of baculoviruses (polyhedra for nuclear polyhedrosis and capsules for granulosis viruses) (Baculovirus, subgroup A and B, family Baculoviridae) can be specifically extracted under high ionic concentration. The extraction is directly proportional to the concentrations of NaCl up to 0.25 m. It is not dependent on pH, species of ions, temperature, and incubation time. The protease is reabsorbed under low ionic concentration by protease-extracted and by heat-treated capsules and polyhedra. The protease from Streptomyces griseus is not absorbed. This indicates that the occlusion body proteins have distinct affinity for certain alkaline proteases.     

安徽红绿茶中主要生化成分构成特点研究

通过对安徽红茶(祁红)绿茶(屯绿)主要产地的成茶中生化成分测定分析,探明了其内含化学成分的构成特点以及形成优良品质的生化机制.     

Biochemical approach to the control ofXyleborus fornicatus (Coleoptera: Scolytidae)

Summary The addition of small quantity of potassium acetate to the fertilizer applied to tea bushes was an effective method of reducing infestation by the beetle pest,Xyleborus fornicatus. The mechanism of action of potassium acetate is discussed as being due to its conversion to saponins and/or sterol analogues which interfere with pupation of the beetle larvae.     

Attack dynamics of the pine shoot beetle, Tomicus piniperda (Col.; Scolytinae) in Scots pine stands defoliated by Bupalus piniaria (Lep.; Geometridae)

Abstract 1 After a 1‐year, extensive pine looper (Bupalus piniaria) outbreak, plots were laid out to study tree susceptibility to attack, and performance of Tomicus piniperda in pine trees suffering from varying levels of defoliation. 2 Tomicus piniperda was the dominating stem‐attacking species among the primary stem colonizers, and 82% of all trees that died had been colonized by T. piniperda. 3 Beetle attacks primarily struck severely defoliated trees, i.e. trees that suffered from 90% to 100% defoliation. 4 Beetle attacks peaked in the second year after cessation of the outbreak, and suppressed trees were both more frequently attacked and more susceptible to beetle attack than intermediate and dominant trees. 5 Trees surviving beetle attacks carried more foliage than trees that did not survive the attacks. 6 A single year of severe defoliation is enough to render pine trees susceptible to secondary pests, such as T. piniperda.     

茶多酚对高糖诱导人晶状体上皮细胞凋亡的影响

目的:探讨茶多酚对高糖诱导的人晶状体上皮细胞(human lens epithelial cells,HLECs)凋亡的影响。方法:建立高糖诱导的HLECs模型,用不同浓度的茶多酚干预,MTT比色法检测细胞存活率,电子显微镜观察细胞形态,透射电镜观察细胞内超微结构变化,Western Blotting检测凋亡相关蛋白的表达水平。结果:高浓度葡萄糖抑制了HLECs活性,葡萄糖干预后细胞活性下降到42.65%±4.12%,与阴性对照组(96.07%±4.02%)比较差异具有统计学意义(P0.01)。用不同浓度茶多酚处理后,HLECs活性分别提高到55.33%±4.15%,72.90%±3.36%和76.00%±3.79%,与氧化损伤组比较差异具有统计学意义(P0.05);高浓度葡萄糖改变了HLECs形态及生长情况,而用茶多酚干预的高糖条件下的HLECs则较好的保持了上皮细胞的形态;高浓度葡萄糖诱导HLECs凋亡反应的发生,引起凋亡相关蛋白表达水平改变,茶多酚抑制了Bax水平的升高,促进了Bcl-2水平的下降。结论:茶多酚可以抑制高糖诱导的HLECs的凋亡,对糖尿病性白内障具有预防作用。