全文获取类型
收费全文 | 119篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
系统科学 | 2篇 |
现状及发展 | 30篇 |
研究方法 | 5篇 |
综合类 | 78篇 |
自然研究 | 5篇 |
出版年
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2012年 | 3篇 |
2011年 | 8篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2007年 | 5篇 |
2006年 | 2篇 |
2005年 | 6篇 |
2004年 | 3篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 6篇 |
1999年 | 7篇 |
1998年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1975年 | 6篇 |
1974年 | 8篇 |
1972年 | 5篇 |
1971年 | 3篇 |
1970年 | 3篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1966年 | 2篇 |
1965年 | 2篇 |
排序方式: 共有120条查询结果,搜索用时 15 毫秒
1.
Summary Contrary to Srdi and Gloor's report, we find crystal cells (cc) in the lymph glands ofD. melanogaster larvae; the size and number of inclusions in the cc cannot be used to distinguish the 2 sibling species,D. melanogaster andD. simulans; cc in the hemocoel are not phagocytic cells; the surface properties of the lamellocytes are consistent with their derivation from plasmatocytes and not cc.Supported by grant No. CA16619 awarded by the National Cancer Institute, DHEW, USPHS. 相似文献
2.
C. Rose Broome 《西北部美国博物学家》2011,41(2)
An expression of Centaurium namophilum (Gentianaceae), long confused with C. exaltatum in the Great Basin of the western United States, is described and designated as var. nevadense. It may be separated from the Death Valley region endemic, var. namophilum, by its broader leaves, its diffuse corymbose cyme, the ultimate peduncles that are longer than the flowers, its medium to deep rose pink corolla, and its stamens that equal or exceed the style and are only slightly exserted from the corolla-tube. The var. nevadense occurs from eastern California to western Utah, and from southeastern Oregon and adjacent Idaho south to the northern Mojave Desert of southeastern California. Centaurium exaltatum may be distinguished from the new variety by its broader, more elliptical leaves, dichotomous peduncles, paler pink or bluish and generally four-merous flowers, shorter and more blunt corolla lobes, and a thicker, more included style and stigma. 相似文献
3.
Megan L. H. Rose Maxwell T. Hincke 《Cellular and molecular life sciences : CMLS》2009,66(16):2707-2719
In this article, we review the results of recent proteomic and genomic analyses of eggshell matrix proteins and draw attention
to the impact of these data on current understanding of eggshell formation and function. Eggshell-specific matrix proteins
from avian (ovocleidins and ovocalyxins) and non-avian (paleovaterin) shells are discussed. Two possible roles for eggshell-specific
matrix proteins have been proposed; both reflect the protective function of the eggshell in avian reproduction: regulation
of eggshell mineralization and antimicrobial defense. An emerging concept is the dual role (mineralization/antimicrobial protection)
that certain eggshell matrix proteins can play. 相似文献
4.
Rose Ella Warner 《西北部美国博物学家》2011,36(4)
A new species of weevil, Phyllotrox canyonaceris Warner, is described, new synonomy, and distribution records of eight species of the genus Phyllotrox in North America are given. 相似文献
5.
This paper reports a case study where soft systems methodology (SSM) was used to help automate a largely manual administrative (examination) information system in a Pakistani university. Various design suggestions for information system improvements, both administrative and IT-supported were made (and implemented) through comparison with another university in Denmark which is well supported by computer systems. An action design research approach with an interpretative epistemology/ontology was adopted. Though the single comparison experience is difficult to generalise, we conclude that SSM (with some adaptations) can enable a socio-technical comparison and design effort and offer a prototype process. The comparison stimulates forward-looking design, but great care must be taken to accommodate cultural differences, and further research is necessary to integrate more sophisticated cultural analysis tools into the design process. The research extends SSM in information system development??from a single situational analysis to a comparative process and can be adapted as a pattern for practitioners with similar automation needs. 相似文献
6.
New Sivapithecus humeri from Pakistan and the relationship of Sivapithecus and Pongo 总被引:2,自引:0,他引:2
New humeri of two species of the Miocene hominoid Sivapithecus are described from near Chinji in Pakistan from between approximately 9 and 11 Myr ago. Sivapithecus, a middle and late Miocene hominoid from Turkey and Indo-Pakistan, is overall unlike any living hominoid, although facial-palatal similarities to the extant orangoutan, Pongo, have been used to support a hypothesis of close relationship. Living hominoids have postcranial similarities assumed to be shared derived, among them features of the proximal humerus. However, the new Sivapithecus proximal humeri differ from those of living hominoids, supporting an alternative hypothesis in which Sivapithecus and Pongo are not closely related. It is not clear how to choose between these incompatible hypotheses. 相似文献
7.
8.
9.
Glycine: a new anti-inflammatory immunonutrient 总被引:7,自引:0,他引:7
10.
Résumé On a mis en évidence chez le Rat une formation de méthylhistamine-3H par décarboxylation de lal-3-méthylhistidine-3H. Cette réaction se produit in vitro et in vivo dans des tissus riches en histidine décarboxylase et elle est prévenue par un inhibiteur de cette enzyme. Les implications biologiques de l'existence de cette nouvelle voie métabolique sont envisagées. 相似文献