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991.
Kaushik Ghosh Nidhi Tyagi Pramod Kumar Udai P. Singh Nidhi Goel 《Journal of inorganic biochemistry》2010,104(1):9-18
A new family of tridentate ligands PhimpH (2-((2-phenyl-2-(pyridin-2-yl)hydazono)methyl)phenol), N-PhimpH (2-((2-phenyl-2-(pyridin-2-yl)hydrazono)methyl)napthalen-1-ol), Me-PhimpH (2-(1-(2-phenyl-2-(pyridine-2-yl)hydrazono)ethyl)phenol) have been synthesized and characterized. The ligands PhimpH and N-PhimpH after deprotonation react with manganese(II) and manganese(III) starting materials affording [Mn(Phimp)2] (1), [Mn(Phimp)2](ClO4) (2), [Mn(N-Phimp)2] (3), [Mn(N-Phimp)2](ClO4) (4). Complexes [Mn(Phimp)2] (1) and [Mn(N-Phimp)2] (3) convert to [Mn(Phimp)2]+ (cation of 2) and [Mn(N-Phimp)2]+ (cation of 4) respectively upon oxidation. Ligand Me-PhimpH stabilized only manganese(III) centre resulting [Mn(Me-Phimp)2](ClO4) (5). The molecular structures of [Mn(Phimp)2], 1 and [Mn(Phimp)2](ClO4), 2 were determined by single crystal X-ray diffraction. X-ray crystal structures of 1 and 2 have revealed the presence of distorted octahedral MnN4O2 coordination sphere having meridionally spanning ligands. Electrochemical studies for the complexes showed Mn(II)/Mn(III), (E1/2 = 0.14-0.40 V) and Mn(III)/Mn(IV), (E1/2 = 0.80-1.06 V) couples vs. Ag/AgCl. The redox properties were exploited to examine superoxide dismutase (SOD) activity using Mn(II)/Mn(III) couple. The complexes 1, 2, 4 and 5 have been revealed to catalyze effectively the dismutation of superoxide () in xanthine-xanthine oxidase-nitro blue tetrazolium assay and IC50 values were found to be 0.29, 0.39, 1.12 and 0.76 μM respectively. DNA interaction studies with complex 2 showed binding of DNA in a non-intercalative pathway. Complexes 1, 2 and 4 exhibited nuclease activity in presence of H2O2 and inhibition of activity was noted in presence of KI. 相似文献
992.
Jagmohan S. Negi Pramod Singh Geeta J. Nee Pant Mohan S. Maniyari Rawat H. K. Pandey 《Biological trace element research》2010,135(1-3):275-282
The present study was carried out to determine the accumulation and variation of trace elements in roots and leaves of Asparagus racemosus collected from four different altitudes in Uttarakhand, India, by atomic absorption spectroscopy. The metals investigated were Zn, Cu, Mn, Fe, Co, Na, K, Ca, and Li. The concentration level of Fe was found to be highest at an altitude of 2,250 m, whereas the level of Cu was lowest. The maximum concentrations of Zn, Cu, Mn, Fe, Co, Na, K, Ca, and Li were found to be 165.0?±?3.2, 34.0?±?0.5, 84.0?±?0.7, 2,040.0?±?0.3, 122.0?±?1.5, 745.0?±?0.3, 13,260.0?±?3.5, 6,153.0?±?1.6, and 58.0?±?3.8 mg/kg, respectively. 相似文献
993.
Kaushal Kumar Singh M. K. Gupta Mahendra Ram Vishakha Singh B. K. Roy 《Biological trace element research》2010,138(1-3):163-172
This experiment was designed to assess the effect of chronic fenvalerate toxicity on tissue Cu concentration in goats and to explore the pathways responsible for it. A significant decrease in tissue Cu concentration of kidney, heart, and brain while an increase in the liver were recorded in fenvalerate intoxicated goats at 15 mg/kg b.w. orally daily for 270 days. Concentration of total Cu, protein-free Cu, and protein-bound Cu in the wet intestine of fenvalerate-treated goats revealed a significant decrease in Cu concentration of the intestine due to the decrease in trichloroacetic acid (TCA)-insoluble Cu, while TCA-soluble Cu remained almost unaffected. Rabbit duodenal loop technique was used to assess the relative absorption of nonisotopic copper in a living animal. This technique enabled to compare Cu absorption from the lumen of three closely associated loops, each receiving 100 µg of copper along with different doses (0, 15, and 30 µg) of fenvalerate. A significant dose-dependent decrease in Cu absorption from the lumen due to fenvalerate treatment was recorded. A decrease in total copper (TCA-insoluble fraction) suggested an interference in active transport of copper due to the inhibition of absorption of protein-bound copper. It was concluded that fenvalerate interfered in copper absorption mostly by inhibiting its active or mediated transport. 相似文献
994.
Jagmohan S. Negi Pramod Singh Geeta J. nee Pant Mohan S. Maniyari Rawat 《Biological trace element research》2010,138(1-3):300-306
Variations of micro- and macrominerals concentration in Swertia speciosa were determined by atomic absorption spectroscopy. The mineral elements showed significant changes in roots and leaves collected from different altitudes. Among all the elements, highest concentration (more than 2,000 mg/kg) of Ca and K were recorded in S. speciosa and the concentration of other elements analyzed in the study decreased in the order Fe>Na>Zn>Co>Li>Cu>Mn. 相似文献
995.
R. K. Jangid R. Sharma Y. Sudarsan S. Eapen G. Singh A. K. Purohit 《Biologia Plantarum》2010,54(4):703-706
Primary leaf explants of aseptically grown seedlings of moth bean [Vigna aconitifolia (Jacq.) Marechal] immersed in water or not were treated in microwave oven (2450 MHz, 800 W cm−2) for 1, 3, 5 and 7 s before culturing. Callusing and shoot emergence from these explants were enhanced up to microwave exposure
lasted 5 s while longer treatment of water-immersed explants delayed callusing. One polypeptide (26.6 kD) was up regulated
in the callus derived from microwave treatment in water-immersed explants. RAPD analysis detected alteration in DNA sequences
due to microwave treatment in water-immersed explants for 7 s. The frequency of mutation was 1.6 % (4 bands out of 248) over
all the cultures analyzed and the same was 13 % (4 bands out of 31), if amplicons generated at 7 s treatment alone were considered. 相似文献
996.
997.
Sindhuja Sundaram Prabhakar Tiwari Shalini Saini Rajiv Kant Joseph Alex Davis Sudhir Sahdev Kulvinder Singh Saini 《Molecular Biology》2010,44(3):473-478
Protein tyrosine phosphatases (PTPs) play multiple roles in many physiological processes. Over-expression of the PTPs has been shown to be associated with cellular toxicity, which may also lead to the deletion of the respective gene from stable cell clones. We also observed that PTP-1B over-expression in CHO and HEK293 stable cell clones led to cytotoxicity and low revival rates during clone generation and maintenance. To address these issues, bacmid transposition technology was utilized to generate recombinant PTP-1B baculovirus, and Spodoptera frugiperda (Sf9 and Sf21) insect cell lines were infected with the virus. The data obtained on expression and activity of the PTP-1B highlights clear advantage of the recombinant baculovi-rus-insect cell expression system over the mammalian cell line technique due to increase in enzyme activity, strongly inhibited by phosphatase specific inhibitor RK682. Possible application of the expression system for producing active enzymes in bulk quantity for a new drug discovery is also discussed. 相似文献
998.
We assessed the distribution and conservation status of bonnet macaques (Macaca radiata), rhesus macaques (Macaca mulatta) and Hanuman langurs (Semnopithecus entellus) in the state of Karnataka, India. Karnataka is situated in southwest India with an area of 191,791 km2. A total of 9697 km of vehicular survey was made from November 2001 to July 2004. We also visited 107 temples/tourist spots
to determine the presence of primates. Bonnet macaques and Hanuman langurs were widely distributed, whereas rhesus macaques
were not found in the state. However, bonnet macaques were absent in a few districts in the northern plains and Hanuman langurs
were absent in some districts of the southern plains. A total of 205 groups of bonnet macaques and 139 groups of Hanuman langurs
were sighted. The relative encounter rate of both species differed across biogeographic zones. Bonnet macaques were largely
encountered in the Western Ghats and the Southern Plateau whereas Hanuman langurs were abundant in the Western Ghats and Northern
Plains. We found that bonnet macaques have been eliminated from about 48% temples/tourist spots where they occurred in the
recent past. The Hanuman langur population of Dharwar–Haliyal Road was assessed during April 2003, and we found that the present
population size was about 38% of a previous survey in 1961. Habitat change, hunting/trapping and translocation were the major
factors causing a decline in the langur population. 相似文献
999.
Sanjay Dwivedi R. D. Tripathi Sudhakar Srivastava Ragini Singh Amit Kumar Preeti Tripathi Richa Dave U. N. Rai Debasis Chakrabarty P. K. Trivedi R. Tuli B. Adhikari M. K. Bag 《Protoplasma》2010,245(1-4):113-124
The exposure of paddy fields to arsenic (As) through groundwater irrigation is a serious concern that may not only lead to As accumulation to unacceptable levels but also interfere with mineral nutrients in rice grains. In the present field study, profiling of the mineral nutrients (iron (Fe), phosphorous, zinc, and selenium (Se)) was done in various rice genotypes with respect to As accumulation. A significant genotypic variation was observed in elemental retention on root Fe plaque and their accumulation in various plant parts including grains, specific As uptake (29–167 mg kg?1 dw), as well as As transfer factor (4–45%). Grains retained the least level of As (0.7–3%) with inorganic As species being the dominant forms, while organic As species, viz., dimethylarsinic acid and monomethylarsonic acid, were non-detectable. In all tested varieties, the level of Se was low (0.05–0.12 mg kg?1 dw), whereas that of As was high (0.4–1.68 mg kg?1 dw), considering their safe/recommended daily intake limits, which may not warrant their human consumption. Hence, their utilization may increase the risk of arsenicosis, when grown in As-contaminated areas. 相似文献
1000.