细叶杜香挥发油抑茵和杀菌作用的研究

应用水蒸气蒸馏法提取细叶杜香挥发油,采用丙酮溶剂溶解杜香挥发油,以青霉菌、酵母菌和金黄色葡萄球菌作供试菌种,在实验中观察不同浓度的细叶杜香挥发油溶液对不同菌种的作用,研究其抑茵和杀菌作用。     

大蓟多糖提取条件优化

本文研究温度、时间、液固比3项因素对中药大蓟中提取多糖的影响,并利用正交实验对该提取工艺进行了优化,结果表明:提取温度95 ℃,提取时间2 h,液固比20:1为最佳提取工艺.     

湖北七姊妹山自然保护区发现亚高山泥炭藓湿地

七姊妹山自然保护区位于湖北省恩施土家族苗族自治州宣恩县的东部,地理位置为109°37′~109°51E′,29°39~′30°5′N,是我国中亚热带向北亚热带的过渡地区[1].2005年6月,我们对七姊妹山自然保护区的自然植被进行考察,在椿木营首次发现了较大面积的亚高山泥炭藓湿地.该湿地位于椿木营的天花板地、落儿坪等地,海拔1 800 m~1 950 m,呈大斑块状分布,总面积约300 hm2.我们在天花板地和落儿坪分别设置了两个20 m×20 m的调查样地,按照B raun-B lan-quet[2]的植被调查方法,对样地内的植物种类,每种植物的优势度与多度、物候期进行了统计.从物种…     

细叶杜香挥发油抑菌和杀菌作用的研究

应用水蒸气蒸馏法提取细叶杜香挥发油,采用丙酮溶剂溶解杜香挥发油,以青霉菌、酵母菌和金黄色葡萄球菌作供试菌种,在实验中观察不同浓度的细叶杜香挥发油溶液对不同菌种的作用,研究其抑菌和杀菌作用.     

大蓟水煎剂治疗小鼠高血压的研究

利用本研究室构建的小鼠高血压模型,研究了大蓟水煎剂对高血压小鼠的降压作用以及对心脏、肾脏等器官的影响,同时检测对凝血的影响。结果表明:适量的大蓟水煎剂灌胃高血压模型小鼠,可显著降低血压至近正常值;大蓟水煎剂对心、肝、肾、脾、胸腺等的脏器体重比无显著影响,但高血压组肾脏和心脏组织细胞密度增大,肾小囊显著变小,治疗组肾脏中肾小囊恢复近正常值,肾脏和心脏组织细胞密度基本恢复正常;大蓟水煎剂治疗的小鼠凝血时间显著缩短。结论:适量的大蓟水煎剂灌胃高血压模型小鼠具有显著降压效应,对心脏和肾脏等内脏器官有较好的保护作用;大蓟增强凝血能力,而且与剂量成正相关性,因此用药量要适度。     

II.—Association between sessile colonial hydroids and fishes

Résumé

1. 1. There is a symbiosis between Sertularia operculata and Squalus acanthias, and between Seralia lendigera and Hippocampus ramulosus—there being but a single case reported for each pair of organisms. It is probable that these associations are entirely accidental.

2. 2. Of Stylactis minoi and Minous inermis, no fewer than twenty-nine specimens of the fish (presumably all ever taken) wherever found—and they have been taken from five widely distant stations on both coasts of India, and from Japan—were infested with the hydroid. Furthermore, so far as known, this particular hydroid has never been found save on this particular fish (inermis). These facts would seem to indicate that this is a purposive or obligate symbiosis.

3. 3. About one hundred specimens of Hypsagonus quadricornis were taken in Puget Sound. Thirty-seven of these were preserved, and ten of them were found to be sparsely covered with Perigonimus pugetensis. Other specimens of the fish taken outside Puget Sound and in Behring Sea all lacked the hydroid. Consideration of all these facts leads to the conclusion that the association is symbiotic and more or less accidental.

4. 4. One case has been presented of Hydrichthys mirus attached to Seriola zonata in Narragansett Bay. Parasitism is alleged, but the proofs offered, that there was some apparent degeneration on the part of the hydroid and some slight evidence of wasting away of the muscles of the fish at the point of attachment, are at best inconclusive, there being no evidence from sections presented to show actual anastomosis of the tissues of the two organisms. From the evidence presented one must conclude that this is only a case of symbiosis.

5. 5. One case is known of the attachment of a Nudiclava to a fish, Monacanthus, from the Andaman Sea. Parasitism is alleged in the title of the paper, but disclaimed in the text, since, in sections cut through the basal plate and the skin to which it was attached, such was not proven. Furthermore, the finding of food in the hydranths discounts the idea of parasitism. This case also must be classed as a symbiosis.

6. 6. True parasitism has been repeatedly shown to exist between an aberrant hydroid, Polypodium hydriforme, and the ovarian eggs of the Volga sterlet, Acipenser ruthenus. This has been definitely established by the work of four investigators, extending in time from 1872 to 1922—a half century. Except in its earliest stages, Polypodium has the nutritive cell-layer of its stolon, the endoderm, on the outside bathed in the egg-yolk. Later this becomes inverted and a large amount of yolk is carried into the common cavity. The egg is used up in nourishing the parasite.

7. 7. True parasitism has been shown between Hydrichthys boycei and numerous individuals of three species of fishes—Ambassis natalensis, Mugil sp., and an undetermined fish belonging to the Glyphidodontidæ—in Durban Bay, South Africa. The parasites were attached to various parts of the fishes, especially the fins. At the points of attachment, haustoria were sent down into flesh and into blood-vessels, and by means of these the parasite fed on the tissues of its host. Furthermore, on none of the hydranths were tentacles ever found, nor was any food ever found in them. Strange to say, the parasite never covers any large area of the fish, and apparently presently drops off leaving a scar behind.

     

龙拳除草剂在青海春油菜田防除效果初报

针对防除春油菜田恶性杂草剌儿菜和苣荬菜,进行了除草剂的防效示范试验。各示范点每公顷施用75%龙拳(SGX)225 g,以50%高特克(SC)600 mL/hm2作对照药,空白处理为对照,龙拳防除刺儿菜的最终控草效果平均达86.04%,防除苣荬菜的最终控草效果平均达82.44%,平均增产14.19%,防除效果较对照药高特克高30个百分点以上。     

A new way for chemical degradation of plastic by natural volatile constituents of <Emphasis Type="Italic">Ledum palustre</Emphasis>

A novel phenomenon of degradation of polypropylene plastic by volatile constituents of Ledum palustre is reported in this study. The characteristic of degradation is described by tensile strength, melting point,and scanning electron micrographs as well as optical micrographs. The chemical composition of volatile oil of Ledum palustre is analyzed by gas chrography and mass spectrometry. The mechanism of degradation and problems needed to be solved are also discussed.     

植物杜香祛斑霜的研制

采用水蒸馏法提取杜香挥发油,制备了杜香祛斑霜.经过安全实验检测,该化妆品安全,无毒、副作用,具有消炎、营养、防晒的功效,从而达到消除雀斑、黄褐斑等之效果.     

神农架大九湖泥炭藓Sphagnum palustre沼泽特征分析

在实地调查的基础上 ,本文对神农架大九湖泥炭藓沼泽的植被组成 ,群落学特征 ,发育趋势作了详细的阐述