They are jinfo mountain in nanchuan county ( natural protection section ), wuling mountain in qianjiang county ( national emphases forest demonstration county which forest cover rate is beyond 50 % ) and zhongliang mountain in beibei county ( artificial destruction is very grave ). some main land use patterns i. e. woodland, garden, infield, abandon infield, shrub and grassplot are selected in those three sample sites. four aspects on soil fertility index of karst environment under different land use patterns in these three sample sites, are revealed in this paper, by using the field test, indoor measure and analysis, outdoor experiment and field investigation, and the knowledge and technique of soil, ecology, physics and chemistry etc. they are physical characteristic ( effective soil thickness, organic layer thickness, soil texture, water - stable aggregate and soil water etc. ), chemical fertility ( organism, omni - n, omni - p, omni - k, alkali - nitrogen, available p, available k and rapid available k etc. ), soil animalcule ( bacteria, fungi, actinomyces and their grosses ) and soil - seed - pool ( plant community diversity index ) in karst ecosystem
本研究以重慶市的南川金佛山(自然保護區) 、黔江武陵山(國家重點退耕還林示範縣,森林覆蓋率50以上)和北碚中梁山(遭人為破壞嚴重)典型巖
溶區為對象,選擇了幾種重要的利用方式,包括林地、果園、耕地、棄耕地和灌草坡,採用野外巖
溶生態調查和室內試驗測量分析相
結合的方法,以不同土地利用方式巖
溶土壤肥力為重點,對不同土地利用方式土壤肥力特徵進行量化分析,找出巖
溶土壤肥力差異的主要方面及其根本原因,論文主要從土壤剖面物理退化指標(有效土層厚度、有機質層厚度、質地、團聚體、水分含量等) ,化學肥力退化指標(有機質、全n 、全p 、全k 、堿解n 、速效p和速效k等) ,樣地土壤微生物指標(細菌、真菌、放線菌數量及總量)以及樣地土壤種子庫植物群落多樣性等4個方面對重慶典型巖
溶區的土壤肥力特徵進行了較為詳細的分析研究,為巖
溶地區士壤資源的合理利用及
結構的調控管理提供依據。
A method to calculate quantitatively the adsorption volume or adsorption space of per mass of adsorbent derived from both the adsorbed molecule volume and the maximum adsorbance of a solute in an adsorption isotherm under a given experimential condition is presented firstly for a solid / liquid adsorption system of the solute in a dilute aqueous solution. this method is suitable for not only mono - layer adsorption, but also mani - layer adsorption and micelle adsorpion of surfactant constructed by hydrophile and lipophile groups. therefore, the surface concentration of the adsorbate, cs, deduced from the adsorption volume is possessed of the meaning of true concentration, and the value of the patition coefficient of the adsorbate between solid and liquid phass, p, attained by the cs and the c, solution concentration of the adsorbate, can be accurate. the foregoing a set of calculations are presented for the solid - liquid adsorption systems consisted of the wool fiber and separately dodecyltrimethyl - ammonium bromide ( dtab ) and hexadecyltrimethyl - ammonium bromide ( ctab ) in this paper. this provides a strong basis for adsorption thermodynamic investigation of adsorbate
對稀
溶液中
溶質的固/液吸附體系,首次提出了根據吸附分子體積和實驗條件下吸附等溫線中的最大吸附量計算單位質量吸附劑的吸附體積或吸附空間的方法.此法適用於單層吸附,也適用於多層吸附和具有親水親油
結構的表面活性劑分子的膠團吸附.由此,吸附質的表面相濃度cs具有真實濃度的含義,相應地,計算得到的
溶質的固/液分配系數p就有了準確值.分別計算由溴代十二烷基三甲銨( dtab )和溴代十六烷基三甲銨( ctab )與羊毛纖維構成的液/固體系分配系數等,為
溶質吸附的熱力學研究奠定了基礎
So these karst series problems are lowness ability of making soils, distributing odds of surface water and groundwater, leakiness of fountain, alkalescence of circumstance, lowness of bio - diversity, rapidness converse succession of vegetation and fragility of soil character and entironment. and karst region produces many problems, e. g. rock desert, soil erosion and degeneration because of artificial influence and destruction
巖
溶空間介質具有地上地下雙層
結構,可
溶巖造壤能力低,巖
溶水空間分佈不均、地表地下水關系密切、水源易漏失,偏堿性環境、生物資源集聚程度低,植被逆向演替快、順向演替難,巖
溶地質與生態環境十分脆弱,受到人為因素的影響和破壞,極易產生石漠化、土壤侵蝕與退化等一系列問題。
Entamoeba histolytica is also called amoeba dysenteriae, and lives mainly in the colon of humans. under certain conditions, it can penetrate the intestinal wall and enter the blood stream, causing amebic dysentery and various types of amebiasis infection with amebae
溶組織阿米巴,又稱為痢疾阿米巴,主要寄生於人的
結腸內,在一定條件下,可侵入腸壁或血流,引起阿米巴痢疾和各種類型的阿米巴病。
The result is a progressive haemolytic anaemia.
結果是造成漸進性的
溶血性貧血。
( i ) in the procession of preparing na2feo4 by electrolyzing and oxidizing anodic iron in the high concentration solution of naoh, the current efficiency is directly proportional to both of the temperature and the alkaline concentration of the anolyte, and the growth rate of the na2feo4 concentration of anolyte is directly proportional to both of the electrolyzing speed and the alkaline concentration of anolyte.,
主要
結論如下: ( 1 )在濃naoh
溶液中直流電解氧化鐵陽極生成na _ 2feo _ 4
溶液的過程中,電解液溫度、陽極液堿濃度與電流效率成正函數關系;電解速度、陽極液堿濃度與陽極液中na _ 2feo _ 4濃度的增長速度成正函數關系。
The air flotation method of wax recovery commonly used in the actual mechanized wax printing mills was compared with the methods we used in our labs, such as hot water dewaxing, org. solvent extn., aq. surfactant recovery and dry dewaxing
摘要將目前機械化蠟染廠採用的氣浮回收蠟和我們實驗室使用的熱水脫蠟法、有機
溶劑萃取回收法、水基表面活性劑乳液回收法及干法除蠟等方法比較,
結果表明:熱水脫蠟法是最適合機械化蠟染廠進行蠟的回收。
According to the research of physiological and biochemical indicators or index, components of soluble proteins, substrate protein of phosphorylation and the activity of protein kinase in low - temperature stress in the leaves of brassica oleracea l., we tried to find the law of the physiological and biochemical response of brassica oleracea l. leaf to low temperature. at the same time, discussion on the signal transduction can also provide further evidences for revealing the mechanism of low - temperature stress. the results are showed as follows : malondialdehyde ( mda ), superoxide dismutase ( sod ), ascorbate peroxidase ( asp ) and peroxidase ( pod ) activities were changed greatly after 0 ~ 30min ' s treating with low temperature
本文以甘藍葉片為材料,通過對低溫5脅迫下甘藍生理生化指標、可
溶性蛋白組分以及磷酸化底物蛋白、蛋白激酶活性的研究,以期找出甘藍葉片對低溫脅迫的生理生化響應規律,為甘藍露地越冬栽培防範寒害提供理論指導,同時對低溫脅迫下甘藍逆境信號傳導進行了探討,從而為徹底弄清低溫脅迫機理提供進一步的證據,研究的主要
結果如下:丙二醛含量( mda ) 、超氧化物歧化酶( sod ) 、抗壞血酸過氧化物酶( asp )和過氧化物酶( pod )活性在低溫處理0 30min發生顯著變化,低溫處理3min后,甘藍葉片內mda含量基本沒有變化,處理5min時出現第一個峰值,達到對照的104 . 10 , 10min出現低谷,僅為對照的86 . 27 ,隨后再次上升, 30min時超過第一峰值,為對照的113 . 93 。
Character : crystal powder, it likes white or grey, asepsis, odorless, and can dissolve in muriatic acid, nitric acid
性狀:
結晶粉末,呈白色或灰白色,無毒、無臭、能
溶於鹽酸、硝酸。
Abstract : the total quantity of perylene quinonoids in hypocrella bambusae ( b. et br. ) sacc., shiraia bambusicola p. henn and culture substance of ascomycetes hypocreacae ( fr ) tul. sp. were determined with spectrophotometric methods. the relative extraction efficiency were studied when ethanol, acetone and chloroform were used as solvents. among them acetone was the best one
文摘:用分光光度法測定了竹紅菌、竹黃和菌寄生菌培養物中?醌類化合物的總量;同時研究了以無水乙醇、丙酮和氯仿為
溶劑提取?醌類化合物的相對效率,
結果發現以丙酮為
溶劑最合適。
In the preparation of microscope slides, the process by which tissues are rapidly killed and preserved by chemicals to prevent decay or autolysis with minimal distortion of structure
在制備顯微鏡切片的過程中,通過固定,在將對植物組織
結構的破壞降至最低程度的基礎上,採用化學物質將細胞迅速殺死並保存,以阻止組織腐爛或自
溶。
The article mainly studied and analyzed the chemical structure and conponents of yeast, pointed out that the way that yeast autolysis combined together with both breaking - wall in temperature difference and high - pressure homogenization can be used to promot the inside things from waste yeast cell and enhance the extract rate, thus searched for the technology in higher extraction rate
摘要主要研究分析了酵母化學
結構與組成,提出了酵母自
溶、溫差破壁、高壓均漿三者相
結合的方法來促進酵母內容物
溶出提高抽提率,探索抽提率比較高的工藝流程。
Antimicrobial effect of the bacteriocin produced by r21 - 4 is studied in the food systems. the results show that the conspicuous antimicrobial effect in the preservation of fresh milk. the samples were stored under 37 and the bacteria concentration in the sample with bacteriocin was 3 - 5 order less than the sample without bacteriocin
考察了r21 - 4產生的細菌素用有機
溶劑萃取制備的方法及其在食品中的防腐效果,
結果表明,細菌素在消毒鮮牛奶的保藏中具有明顯的防腐效果,樣品添加細菌素在37保存24h - 48h后與對照相比細菌總數相差3 - 5個數量級,防腐效果顯著。
Glucose biosensors were then constructed by these nanocomposites, and their electrochemical properties had been explored. secondly, the self - assembled nanocomposite was formed by mwnts and biopolymer, and was used to study the electrochemical properties of nadh. and finally, the modified electrode which was formed by immobilizing small molecular onto electrode surface, was used to detect dsdna in the solution
本論文首先,將多壁碳納米管( mwnts )與納米顆粒相
結合,制備的納米復合材料用於構建葡萄糖生物傳感器,並研究了它的電化學性質;然後,將mwnts與生物聚合物自組裝制備的納米復合材料用於研究nadh的電化學性質;最後,本文還將小分子自組裝固定在電極表面,用於測定
溶液中的dsdna 。
Zn power, se power and diethylamine was used as the sources in this method and nanocrystal znse powders were synthesized at 225. these powders have been identified as polycrystal znse with zinc blende structure by xrd. the size of particle is about 100nm ~ 200nm
採用zn粉和se粉為原料,以二乙胺為
溶劑,在225下得到了znse粉末, xrd
結果顯示其為znse多晶粉末,從tem照片可看出其顆粒的尺寸約為100nm 200nm 。
The soft powder fired at high temperature until the ceramic particles melt and coalesce to form a glaze.
松軟的粉末在高溫下燒結,陶土粒子即溶結成一層瓷釉。