首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   794篇
  免费   69篇
  国内免费   91篇
  2023年   17篇
  2022年   14篇
  2021年   19篇
  2020年   31篇
  2019年   37篇
  2018年   31篇
  2017年   36篇
  2016年   33篇
  2015年   14篇
  2014年   49篇
  2013年   44篇
  2012年   27篇
  2011年   37篇
  2010年   20篇
  2009年   54篇
  2008年   50篇
  2007年   46篇
  2006年   36篇
  2005年   39篇
  2004年   30篇
  2003年   28篇
  2002年   19篇
  2001年   21篇
  2000年   20篇
  1999年   15篇
  1998年   10篇
  1997年   19篇
  1996年   18篇
  1995年   13篇
  1994年   17篇
  1993年   16篇
  1992年   9篇
  1991年   9篇
  1990年   11篇
  1989年   5篇
  1988年   10篇
  1987年   2篇
  1986年   5篇
  1985年   8篇
  1984年   6篇
  1983年   2篇
  1982年   7篇
  1981年   4篇
  1980年   6篇
  1979年   3篇
  1978年   2篇
  1976年   3篇
  1972年   2篇
排序方式: 共有954条查询结果,搜索用时 15 毫秒
1.
椭圆斜羽叶的解剖研究及斜羽叶的系统分类位置   总被引:2,自引:0,他引:2  
本文根据对椭圆斜羽叶(Plagiozamites oblongifolius)钙质石化化石的研究,认为其主要特征如下:羽状复叶,叶肉无海绵组织和栅栏组织分化。羽片叶脉维管束外韧式,木质部外始式,与现代苏铁属叶脉特征相近。羽轴维管束为“U”形,外始式木质部、梯状纹孔管胞,与现代苏铁属的羽轴维管束相似。根据上述特征,目前可将斜羽叶属归入原始苏铁类植物。但是,如果斜羽叶的生殖器官同 Noeggerathia 一样,为异孢型孢子囊穗,则斜羽叶可能为一种与苏铁类起源有关的原裸子植物。  相似文献   
2.
On the systematic position of the family Gyrinidae (Coleoptera: Adephaga)   总被引:2,自引:0,他引:2  
Various characters of adult and larval members of Adephaga and Cupedidae were analyzed, and suggest that Gyrinidae are the sister-group of the remaining Adephaga, and are not closely related to the remaining aquatic Adephaga. The aquatic families Noteridae, Amphizoidae, Hygrobiidae and Dytiscidae seem to form a well founded monophyletic unit. The following characters are considered as synapomorphies of Adephaga excluding Gyrinidae: bifurcate condition of the muscle (= M.) tentoriopraementalis inferior, reduction of hypopharynx, strongly developed prosternal process, reduction in size and specialized modification of the ventral sclerite of the mesothorax, strongly developed mesofurcal arms, a high mesopleural ridge, globular mesocoxae restricted to rotatory movements, invaginated sternum VIII (coxostemum), the strongly curved base of the median lobe of the aedeagus, which articulates with the parameres, the rotated position of the aedeagus in repose, fusion of the larval clypeolabrum with the frons and reduction of the larval lacinia. Mesal shifting of M. episterno-coxalis prothoracis, and the fusion of the apical portions of the malpighian tubules of either side are considered as synapomorphies of Adephaga excluding Rhysodidae and Gyrinidae. Lateral reduction of the meta “sternal” transverse ridge and the presence of the subcubital setal binding patch of the hind wing are considered as synapomorphic characters of Trachypachidae, Noteridae, Amphizoidae, Hygrobiidae and Dytiscidae. We postulate that the metacoxal fusion occurred independently in gyrmids and the common ancestor of Trachypachidae, Noteridae, Amphizoidae, Hygrobiidae and Dytiscidae. Consequently we consider this character state as another synapomorphy of Trachypachidae and Hydradephaga excluding Haliplidae and Gyrinidae. The following characters are considered as synapomorphies of Noteridae, Amphizoidae, Hygrobiidae and Dytiscidae: Loss of tactile setae on the head capsule, metafurcal origin on the intercoxal wall, expansion of the intercoxal wall, elongation of the subcubital setal binding patch, loss of Mm. furca-coxale anterior and posterior, reduction of the larval abdominal segments IX and X, and the shifting of the uropmphi onto the ventral side of segment VIII. Presence of M. tentorio-mandibularis and M. stipitopalpalis intemus are certainly primitive features of adult gyrinids but the distribution of these character states among most members of Adephaga is yet unclear. Chemical defence gland constituents point towards a very isolated position of Gyrinidae. The old age of the group, documented by a larva found in upper Permian deposits, may support the hypothesis of a sister-group relation-ship between Gyrinidae and the remainder of Adephaga.  相似文献   
3.
李林初   《广西植物》1988,(2):135-141
本文比较了金松(属)和杉科其他各属植物的核型,它的染色体数目(2n=20)和基数(x=10)较低,其核型最为对称。细胞学资料支持金松属从杉科分出另立金松科SciadopityaceaeHayata,它的系统位置则很可能比杉科来得原始。这也得到古植物学的支持。  相似文献   
4.
The cold oligo-eurytherm diatomsCoscinodiscus concinnus W. Smith andRhizosolenia setigera Brightwell were cultured to determine their best competitive position by growth. Comparison of their generation times with those of other diatoms indicate that they reach this position between 6°C and 12°C. Both species grew between –1.5°C and about 20°C. The experiments indicate thatC. concinnus flowerings are possible in a deep water column, during periods of high light intensities. The simultaneous death of species in the upper layer is also caused by high light intensities.C. concinnus appeared in two morphological forms; the normal voluminous form, and a flatter form with a few intercalary bands only, filled with large oil-droplets. The latter appeared at 0°C and below, and at the upper temperature limit for growth of about 19°C–20°C. The separation of nov. spec. fromC. concinnus based on the absence or presence of a hyaline area and intercalary bands as identification characteristics should be reconsidered.  相似文献   
5.
6.
Waterstriders on ponds and creeks compensate for displacement caused by wind or water current with periodical jumps against the direction of drift. This behavior is mediated by visual stimuli.
1.  Waterstriders are able to detect the direction and extent of their displacement on an artificial canal when visual cues are reduced to a single point-like light source above the upstream end of the canal. They adjust the frequency and direction of the compensatory jumps to keep their mean position on the canal constant. The mean amplitude of the jumps is constant and independent of the stream velocity.
2.  During drift compensation the light spot is kept in the frontal visual field at a fixed angle of elevation. This set angle differs among individuals and can be changed with time.
3.  The station-keeping ability can hardly be explained by a velocity servo system since there is no accumulating position error. The average compensatory movements are governed by a discontinuously working position servo.
4.  When the light spot is switched off, a few jumps are still performed. Jumps, therefore, are not triggered individually by visual cues. Waterstriders must possess an endogenous jump-generator.
  相似文献   
7.
A study was carried out on the social position of 12 subadult males of a semifreeranging Barbary macaque population during the non-mating season. The social position was measured in terms of spatial as well as interactive parameters. The subadult males had social contacts to members of nearly all other age-sex classes but showed clear preferences for same-sexed partners. Besides this differences were found between 5- and 6-year-old males with respect to their interaction profiles and the preference for special classes of interaction partners. The terms “peripheral-central” is discussed with reference to the social structures of macaque societies. The data of the present study indicate that the social position of subadult male Barbary macaques can not be described by one of these terms exclusively. The results are compared to other studies on Barbary macaques and other macaque species. It is concluded that in macaque societies subadult males are not obligatorily forced to live at the periphery or to abide. It is proposed not to postulate stiff social structures but to put more emphasis on the range of variation among macaque species.  相似文献   
8.
金钱松(属)的细胞分类学研究   总被引:2,自引:0,他引:2  
我国特有植物金钱松Pseudolarixamabills的体细胞染色体数目为2n=44,不同于n=12(Miyake&Yasui,1911)和2n=24(Dunieu-Vabre,1961)的结果。核型公式为K(2n)=44=4sm+40t)4SC)属3B类型,与K(n)=22=2m+20t(Sax&Sax,1933)和K(2n)=44=4sm+40t(Hizume1988)有差异。染色体相对长度组成为=44=4L+12M_2+26M_1+2S。金钦松(属)不仅在染色体数目(2n=44)和核型(具20对端着丝粒染色体)而且它的一些形态、解剖学和植化性状与所有松科其它各属不同。另外,它的一系列形态、解剖、孢粉、生化、植化和古植物学特征显然表明把该属与落叶松属、雪松属一起组成落叶松亚科是不适宜的。因此似乎有理由把金钱松从该亚科分出并建立一个单型的金钱松新亚科。本文还对金钱松(属)核型可能由近缘的铁杉属起源和进化而来作了讨论。  相似文献   
9.
伯乐树茎次生木质部结构的研究   总被引:7,自引:0,他引:7  
利用光镜和扫描电镜对伯乐树(Bretschneidera sinensisHem sl.)茎次生木质部的结构进行了研究。其主要特征为:(1)散孔材,有较明显的生长轮;(2)导管分子多为单穿孔板,少数为梯形复穿孔板,具螺纹加厚;(3)管胞、纤维-管胞和韧型木纤维同时存在,后两者有的具分隔;(4)木薄壁组织以轮界分布为主;(5)木射线多为大型异形射线,属异形IIB型;(6)缺乏侵填体、树脂道及分泌细胞。对伯乐树科(Bretschneideraceae)的系统位置作了探讨。  相似文献   
10.
Adams  M. L.  Norvell  W. A.  Peverly  J. H.  Philpot  W. D. 《Plant and Soil》1993,155(1):235-238
Leaf reflectance and fluorescence characteristics of soybean (Glycine max cv Bragg) are influenced strongly by Mn availability. This report evaluates the effects of leaflet choice, leaf age, and leaf nodal position on several spectral characteristics. Leaves were obtained from soybeans grown hydroponically under controlled environmental conditions with wide differences in Mn supply. The ratio of constant yield fluorescence (Fo) to variable yield fluorescence (Fv), the ratios of reflectance at 750 nm to 550 nm and that at 650 nm to 550 nm, the position of the "red edge" near 700 nm, and an index of leaf "yellowness" were measured periodically. Increasing leaf age caused increases in the "red edge" and in both reflectance ratios. Leaf "yellowness" and the fluorescence ratio Fo/Fv decreased with leaf age and increased with leaf nodal position, primarily in Mn deficient leaves. Effects arising from leaf choice were smaller than those caused by Mn deficiency.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号