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1.
刘建林  李晓江 《植物研究》2001,21(3):337-337
发表了木犀属红柄木犀一新变种即小果木犀。  相似文献   

2.
由于指定的两号标本分别为花和果模式标本,厚叶木犀在种及变种等级上的名称Osmanthus pachyphyllus H.T.Chang和O.marginatus var.pachyphyllus(H.T.Chang)R.L.Lu是不合格发表的名称。通过指定模式标本,对厚叶木犀O.marginatus var.pachyphyllus的名称作了合格发表。  相似文献   

3.
中国木犀属小志   总被引:5,自引:0,他引:5  
  相似文献   

4.
该文描述了采自浙江南部的木犀属(Osmanthus Lour.)一新种——浙南木犀(O.austrozhejiangensis Z.H.Chen,W.Y.Xie et X.Liu),并附有线描图和彩色照片。该种在具聚伞花序,叶柄、小枝、苞片、花梗被柔毛等性状上接近于毛柄木犀(O.pubipedicellatus Chia ex H.T.Chang),不同之处在于叶片倒卵形、倒卵状椭圆形或椭圆形,长(5.5~)8~10(~13)cm,宽(2.2~)3~4.5(~5)cm,先端急尖或短渐尖,叶缘具尖锐细锯齿或全缘,侧脉8~10对,花较大,花冠管长2.2~2.3 mm,裂片长2.2~3.0 mm,花丝长1.3~1.5 mm,花药长约1.2 mm。该新种的发现为研究东亚木犀属自西南向东北方向迁移与演化提供了新的材料。  相似文献   

5.
中国木犀属花粉形态研究及其系统学意义   总被引:6,自引:0,他引:6  
观察了中国木犀属4组21种植物的花粉形态。花粉为圆球形或近长球形,外壁表面均具网状纹饰。大多数种类都具有三孔沟的萌发孔,极少四孔沟,或六萌发孔。内孔明显或不明显,有9种植物同时存在具三孔沟和具三沟二种类型的花粉及中间过渡类型(显脉木犀同时存在具三拟孔沟和具四拟孔沟)。很多特点表明,木犀属花粉的萌发孔在木犀科中处于由简单萌发孔向复合萌发孔过渡的阶段。根据网眼从沟间区中央到沟边是否变细,可将本属花粉分为两大类型,与分组有一定的对应关系。综合一些花粉特征,可发现本属花粉形态差异较明显,与一般形态差异有一定的相关性。花粉形态在木犀属具有一定的系统学意义。  相似文献   

6.
运用经典分类方法,在对木犀属进行系统研究的基础上,归并了总状桂花Osmanthus racemosus X.H.Song,将其作为厚叶木犀O.marginatus(Champ.ex Benth.)Hemsl.var.pachyphyllus(H.T.Chang)R.L.Lu的一个新异名;将大果桂花O.macrocarpus P.Y.Bai转移到野桂花O.yunnanensis(Franchet)P.S.Green下作为其异名,从而给出了木犀属的两个新异名。  相似文献   

7.
小蜡精油的化学成分   总被引:3,自引:0,他引:3  
  相似文献   

8.
黎平桂花 新种 图1 Osmanthus lipingensis J. D. Liu, sp. nov.(Sect. Osmanthus)  相似文献   

9.
运用经典分类方法,在对木犀属进行系统研究的基础上,归并了总状桂花Osmanthus racemosus X.H.Song,将其作为厚叶木犀O.marginatus(Champ.ex Benth.)Hemsl.var.pachyphyllus(H.T.Chang)R.L.Lu的一个新异名;将大果桂花O.macrocarpus P.Y.Bai转移到野桂花O.yunnanensis(Franchet)P.S.Green下作为其异名,从而给出了木犀属的两个新异名。  相似文献   

10.
木犀草苷的药理作用研究   总被引:2,自引:0,他引:2  
通过对木犀草苷在呼吸系统、心血管系统、中枢神经系统以及解热抗炎、抗病毒、抗肿瘤等方面作用的分析,为木犀草苷的开发利用提供依据。  相似文献   

11.
采用聚丙烯酰胺凝胶电泳法检测伤寒杆菌和甲型副伤寒杆菌的CWDMs及其宁代细菌型和伤寒杆菌粗糙型的乳酸脱氢酶(LDH)同功酶,以了解沙门菌CWDMs生物氧化的特点和机制,探讨CWDMs变异的性质。结果表明,伤寒杆菌和甲型副伤寒杆菌的细菌型及伤寒杆粗糙型在聚丙烯酰胺凝胶电泳后显示出相同的4种具有不同泳动速率的LDH同功酶,但CWDMs仅显示2种LDH。CWDMs的2种LDH同功酶与其亲代细菌型及伤寒杆  相似文献   

12.
沙门菌CWDMs脂代谢检测   总被引:9,自引:2,他引:7  
采用毛地黄皂苷敏感试验和菌细胞胆固醇、甘油三脂及胆碱酯酶定性与定量分析法,检测伤寒杆菌和甲型副伤寒杆菌经L 型变异后形成的细胞壁缺陷突变株(CW DM )的脂类代谢活性,了解这些CW DM 变异的性质和探讨细菌细胞壁缺陷突变与细菌演变的关系。结果表明,沙门菌CW DM s 具有显著的胆固醇和甘油三脂代谢活性、对毛地黄皂苷高度敏感并且还具有与白色念珠菌相似的胆固醇和甘油三脂的含量,但未能检出胆碱酯酶活性。CW DM s返祖菌丧失了脂类代谢酶类和胞浆膜不含胆固醇,恢复了与其亲代细菌型相似的代谢特征。提示在沙门菌天然即存在有与脂类及胆固醇代谢相关的基因,细胞壁的缺陷导致这些脂类及胆固醇代谢基因活化,以致 CW DM s 能够表达固醇和甘油三脂代谢活性和胞浆膜含有胆固醇  相似文献   

13.
沙门菌CWDMs氨基酸代谢的检测   总被引:3,自引:0,他引:3  
易旭  王和 《中国微生态学杂志》2000,12(3):142-143,145
采用氨基氨利用生长试验和谷丙转氨酶(GPT)、谷草转酶(GOT)、乳酸脱氨酶(LDH)、肌酸激酶(CK)、α-闳丁酸脱氢酶(α-HBD)、γ-谷志肽酶(γ-GT),酸性磷酸酶(ACP)定性与定量分析法,检测伤CWDMs变异的特点及其机制,探讨CWDMs变异的性质及其与细胞壁缺陷突变的关系。结果表明,沙门菌CWDMs变异的性质及其与细胞壁缺陷突变的关系。结果表明,沙门菌CWDMs在仅含蛋氨酸或脯氨  相似文献   

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16.
光照对蕨类植物配子体假根向重力性的影响   总被引:3,自引:0,他引:3  
对8种蕨类植物配子体假根向重力性反应的研究结果表明,除卷柏Selaginella tamariscina Spring配子体假根无向重力性反应并且其生长方向与光照方向无关外,其它7种的配子体假根均有向重力性反应,并且假根的向重力性反应在配子体发育初期,因光照的方向不同而异,表现为负向光性。随着配子体发育至片状体阶段,光对其向重力性反应的影响逐渐减弱,而重力的影响增强。在蕨类植物配子体发育初期,光对  相似文献   

17.
作者解剖观察了33种,隶于4目、7亚目、15科、19属的中国鳐类脑颅的形态。研究结果认为:锯鳐目和鳐目是原始类群,它们均具吻软骨,其中圆犂头鳐科和团扇鳐科是特化类群。电鳐目亦具吻软骨,它们是特化和退化类群。在较高等的鲼目则无吻软骨。依据鳐类不同的分类阶元,其脑颅亦各具有不同的式型。  相似文献   

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19.
1. It is shown that the concentrations of different salts required to precipitate suspensions of gelatin-coated collodion particles in water are practically identical with the concentrations of the same salts required for the "salting out" of gelatin from aqueous solutions. Neither effect shows any relation to the electrical double layers surrounding the particles. 2. It is shown that at the isoelectric point of gelatin, suspensions of gelatin-coated collodion particles are not stable and it had been shown previously that gelatin is least soluble at the isoelectric point. The addition of salt increases both the solubility of gelatin in water as well as the stability of suspensions of gelatin-coated collodion particles in water, and both effects increase with the valency of one of the ions of the salt. 3. This latter effect is not due to any charges conferred on the gelatin particles by the salts, since the cataphoretic experiments show that salts like NaCl, Na2SO4, or CaCl2, which at the isoelectric point of gelatin increase the solubility of gelatin as well as the stability of suspensions of gelatin-coated collodion particles, leave the particles practically uncharged in the concentrations in which the salts are efficient. 4. It follows from all these facts that the stability of suspensions of gelatin-coated particles in water depends on the solubility of gelatin in water; e.g., on the chemical affinity of certain groups of the gelatin molecule for water. 5. Though crystalline egg albumin is highly soluble in water, the stability of collodion particles coated with crystalline egg albumin does not depend upon the affinity of the albumin molecule for water, but depends practically alone on the electrical double layer surrounding each particle. As soon as the P.D. of this double layer falls below 13 millivolts, the suspension is no longer stable. 6. The critical potential for the stability of suspensions of collodion particles coated with genuine egg albumin is the same as that for particles of boiled (denatured) white of egg. Since through the process of heating, egg albumin loses its solubility in water, it is inferred that egg albumin undergoes the same change when it forms a film around a solid particle like collodion. 7. The influence of electrolytes on the stability of suspensions of collodion particles coated with casein or edestin was similar to that of collodion particles coated with egg albumin. The experiments are, however, complicated by the fact that near the isoelectric point CaCl2 and even NaCl cause a suspension again at concentrations of about M/2 or 1 M, while still higher concentrations may cause a precipitation again. These latter effects have no connection with double layers, but belong probably in the category of solubility phenomena. 8. These experiments permit us to define more definitely the conditions for a general protective action of colloids. Protective colloids must be capable of forming a durable film on the surface of the suspended particles and the molecules constituting the film must have a higher attraction for the molecules of the solvent than for each other; in other words, they must possess true solubility. Only in this case can they prevent the precipitating action of low concentrations of electrolytes on particles which are kept in suspension solely by the high potentials of an electrical double layer. Thus gelatin films, in which the attraction of the molecules for water is preserved, have a general protective action, while crystalline egg albumin, casein, and edestin, which seem to lose their attraction for water when forming a film, have a protective action only under limited conditions stated in the paper.  相似文献   

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