Vision and development in Trichoderma atroviride

Phototropism, the induction of carotenogenesis and reproductive structures, and resetting of the circadian rhythm are controlled by blue light. Trichoderma is used as a photomorphogenetic model due to its ability to conidiate upon exposure to light. In total darkness, T. atroviride grows indefinitely as a mycelium provided that nutrients are not limiting. However, nutrient deprivation and light trigger the conidiation process. A pulse of blue light given to a radially growing colony induc…     

气候变化及其对农业的影响

研究分析了我国气候变化及其未来变化发展趋势,气候变化对我国农业生态环境的影响。提出了适应气候变化的对策。     

Persistent increase in brain serotonin turnover after chronic administration of LSD in the rat

Lysergic acid diethylamide at doses of 20 micrograms per kilogram per day was administered orally to rats for I month. Eighteen hours after the final dose a 25 to 30 percent increase in the synthesis and turnover of serotonin was noted, as well as a moderate but significant increase in the concentration of tryptophan (18 percent) and serotonin (13 percent) in the brain.     

Experimental Diabetes and Diet

In the experiments described the following observations have been made: (1) The toxic and diabetogenic action of alloxan increases in rats fed a low protein diet and even more so in the case of a high lard or ox fat diet. (2) The action of these fat diets was corrected by the addition of methionine, thiouracil, or coconut oil, but there was no modification either by addition of choline or sulfonamide or by increase in the protein proportion. (3) In rats fed other high fat diets (olive oil, butter) the actions of alloxan were not modified, but there was a slight diminution when high oleomargarine or corn oil diets were fed. However, complete protection was observed when a high coconut oil diet was administered. (4) The unfavorable effect of the high lard diet was observed also on the initiation and evolution of diabetes due to subtotal pancreatectomy. Contrarily, feeding a high protein diet and especially treatment with thiouracil had a favorable effect. (5) Diabetes appeared first in subtotal pancreatectomized rats which were overfed, then in those which ate ad libitum, and finally in those which were underfed. Diabetes appeared in rats fed a single meal before it did in those eating the same amount of food divided into three meals.     

Disruption of the epithelial apical-junctional complex by Helicobacter pylori CagA

Helicobacter pylori translocates the protein CagA into gastric epithelial cells and has been linked to peptic ulcer disease and gastric carcinoma. We show that injected CagA associates with the epithelial tight-junction scaffolding protein ZO-1 and the transmembrane protein junctional adhesion molecule, causing an ectopic assembly of tight-junction components at sites of bacterial attachment, and altering the composition and function of the apical-junctional complex. Long-term CagA delivery to polarized epithelia caused a disruption of the epithelial barrier function and dysplastic alterations in epithelial cell morphology. CagA appears to target H. pylori to host cell intercellular junctions and to disrupt junction-mediated functions.     

改性粉煤灰混凝剂HYL处理印染废水的研究

以改性粉煤灰 HYL为混凝剂 ,按 3.5 0～ 4 .0 0 g· L-1的投加量 ,常温下沉降反应 1h,就可使 CODcr为 85 0 mg· L-1印染废水中的 CODcr降到 170 mg· L-1以下 ,色度降到 4以下 ,达到国家行业排放标准。为印染废水的处理探索出了一条新路。     

西藏林芝地区藏式庭院绿化模式研究

对西藏林芝地区的藏式庭院景观进行了调查,结果表明:(1)藏式庭院注重观花花卉,以具有农业气息的园艺植物为主,力求自然及管护简易,不注重修剪;(2)造景注重花卉的形、色、花期及视觉审美,形成了以花卉配置为主要内容的"花园",其审美观念、造景风格与西方欧式庭院较为接近,在设计元素上重视植物,忽视水体设计;(3)草坪与观花类植物、果树及园艺作物相比,处于次要地位。     

高效液相色谱法测定烤烟类胡萝卜素

为了建立一种快速、准确测定烤烟叶中类胡萝卜素备量的方法，探索了反相高效液相色谱法分离类胡萝卜素的试验条件．结果表明，采用90％丙酮提取和0．1％二丁基羟基甲苯抗氧化剂保护，用乙酸乙酯和90％含水乙腈溶液作为流动相进行梯度洗脱，可以快速、准确地分离测定烤烟叶中β-胡萝卜素和叶黄素的含量．该法具有良好的线性（相关系数为0．9991～0．9998）和重复性（相对平均偏差小于2．21％），平均回收率可达到94．25％，并可有效防止类胡萝卜素氧化，适用于大批量样品的分析检测．     

人工授粉对丝瓜果实生长的影响

对早春丝瓜进行人工辅助授粉,结果表明:人工授粉能加快丝瓜果实生长膨大的速度,提高果实商品性,减少畸形瓜,而且还能显著提高丝瓜坐果率及前期产量,在生产上具有较大的应用价值。     

影响一品红试管苗生根的因素

以一品红旗帜和福星两个品种试管苗为材料,研究了不同因素对试管苗生根的影响。结果表明,生长素种类及其浓度是影响一品红试管苗生根的主要因素,其单独作用以IBA的效果较好,两个品种的适宜浓度分别为0.5和1.0 mg/L。不同生长素配比使用时,两个品种试管苗生根均以1/2 MS+IBA 0.5 mg/L+NAA 0.2 mg/L为好。适当的蔗糖浓度、培养温度及在生根培养前期进行暗培养有利于提高试管苗的生根率。