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891.
Sang Hyun Lee Thanh Thi Ngoc Doan Sung Ho Ha Woo-Jin Chang Yoon-Mo Koo 《Journal of Molecular Catalysis .B, Enzymatic》2007,47(3-4):129-134
The immobilization of lipase from Candida rugosa, using ionic liquids as additives to protect the inactivation of lipase by released alcohol and shrinking of gel during sol–gel process, was investigated. The influence of various factors, such as structure of ionic liquids, content of ionic liquids and types of precursor in the sol–gel process on the activity and stability of immobilized lipase was also studied. The highest hydrolytic activity of immobilized lipase was obtained when the hydrophilic ionic liquid, [C2mim][BF4], was used as an additive, while the highest stability of immobilized lipase was obtained by using hydrophobic ionic liquid, [C16mim][Tf2N]. Therefore, the binary mixtures of these ionic liquids as additives were used to obtain the optimal immobilized lipase, which shows both high activity and stability. The hydrolysis and esterification activities of lipase co-immobilized with the mixture of 1:1 at molar ratio of [C2mim][BF4] and [C16mim][Tf2N] were 10-fold and 14-fold greater than in silica gel without ionic liquids (ILs), respectively. After 5 days incubation of this immobilized lipase in n-hexane at 50 °C, 84% of initial activity was remained, while the residual activity of the lipase immobilized without ILs was 28%. 相似文献
892.
The objective of the present study was to develop a biological technology that would protect logs destined for oriented strand
board (OSB) manufacturing from biodegradation. Aspen, red maple, and yellow birch trees were felled in one summer and the
logs either debarked or not debarked, and either treated or not treated with a biological product of Gliocladium roseum. The logs were piled in different treatment groups and stored in a yard for 5 months and 1 year before evaluation. The results
showed that all untreated logs, with or without bark, were seriously degraded by moulds, stain and decay fungi after a summer
storage period of 5 months. The logs with bark were more degraded than the debarked logs, and the log ends were more degraded
than the middle sections. After 5 months, 55–83% of the surface area of the wood discs was degraded in untreated logs. The
biological treatment was effective, and only 4–16% of the surface area of the wood discs in treated logs was infected by various
fungi. Strands cut from untreated logs consisted of 50–75% grey- or blue-stained strands, whereas those cut from biologically
treated logs consisted of 10–25% such strands. Panels made using biologically treated logs had a lower thickness swelling
and water absorption values compared to panels made using freshly cut logs and untreated stored logs. The other physical and
mechanical properties of the various panels made in this test were comparable. In terms of mould resistance, all panels made
from fungal-treated logs had a better mould resistance than those made from freshly cut and untreated logs. 相似文献
893.
894.
The purpose of this investigation was to characterize the in vitro stability and in vivo disposition of paclitaxel in rats after solubilization of paclitaxel into hydrotropic polymeric micelles. The amphiphilic block copolymers consisted of a micellar shell-forming poly(ethylene glycol) (PEG) block and a core-forming poly(2-(4-vinylbenzyloxy)-N,N-diethylnicotinamide) (P(VBODENA)) block. N,N-Diethylnicotinamide (DENA) in the micellar inner core resulted in effective paclitaxel solubilization and stabilization. Solubilization of paclitaxel using polymeric micelles of poly(ethylene glycol)-b-P(D,L-lactide) (PEG-b-PLA) served as a control for the stability study. Up to 37.4 wt % paclitaxel could be loaded in PEG-b-P(VBODENA) micelles, whereas the maximum loading amount for PEG-b-PLA micelles was 27.6 wt %. Thermal analysis showed that paclitaxel in the polymeric micelles existed in the molecularly dispersed amorphous state even at loadings over 30 wt %. Paclitaxel-loaded hydrotropic polymeric micelles retained their stability in water for weeks, whereas paclitaxel-loaded PEG-b-PLA micelles precipitated in a few days. Hydrotropic polymer micelles were more effective than PEG-PLA micelle formulations in inhibiting the proliferation of human cancer cells. Paclitaxel in hydrotropic polymer micelles was administered orally (3.8 mg/kg), intravenously (2.5 mg/kg), or via the portal vein (2.5 mg/kg) to rats. The oral bioavailability was 12.4% of the intravenous administration. Our data suggest that polymeric micelles with a hydrotropic structure are superior as a carrier of paclitaxel due to a high solubilizing capacity combined with long-term stability, which has not been accomplished by other existing polymeric micelle systems. 相似文献
895.
896.
Lim BO Lee JH Ko NY Mun SH Kim JW Kim do K Kim JD Kim BK Kim HS Her E Lee HY Choi WS 《Experimental biology and medicine (Maywood, N.J.)》2007,232(11):1425-1431
The antiallergic activity of Polygoni cuspidati radix (PR) and the mechanism of action by which it functions were investigated in this study. The extract of PR exhibited potent inhibitory activity in mast cells; its IC50 values were 62 +/- 2.1 microg/ml for RBL-2H3 mast cells and 46 +/- 3.2 microg/m for bone marrow-derived mast cells by antigen stimulation, and it also suppressed the expression of tumor necrosis factor-alpha and interleukin-4 in RBL-2H3 cells. According to the in vivo animal allergy model, it inhibited a local allergic reaction, passive cutaneous anaphylaxis, in a dose-dependent manner. With regard to its mechanism of action, PR inhibited the activating phosphorylation of Syk, a key signaling protein for the activation of mast cells. It also suppressed Akt and the mitogen-activated protein kinases ERK1/2, p38, and JNK, which are critical for the production of various inflammatory cytokines in mast cells. The results of the study indicate that the antiallergic activity of PR is mediated through the inhibition of histamine release and allergic cytokine production by the inhibition of Syk activating phosphorylation in mast cells. 相似文献
897.
Hameed Gul Mengya Qian Mohammad G. Arabzai Tianhui Huang Qiannan Ma Fangyu Xing Wan Cao Tingting Liu Hong Duan Qianlin Xiao Zhizhai Liu 《Phyton》2022,91(7):1429-1443
Kernel size-related traits, including kernel length, kernel width, and kernel thickness, are critical components in determining yield and kernel quality in maize (Zea mays L.). Dissecting the phenotypic characteristics of these traits, and discovering the candidate chromosomal regions for these traits, are of potential importance for maize yield and quality improvement. In this study, a total of 139 F2:3 family lines derived from EHel and B73, a distinct line with extremely low ear height (EHel), was used for phenotyping and QTL mapping of three kernel size-related traits, including 10-kernel length (KL), 10-kernel width (KWid), and 10-kernel thickness (KT). The results showed that only one QTL for KWid, i.e., qKWid9 on Chr9, with a phenotypic variation explained (PVE) of 13.4% was detected between SNPs of AX-86298371 and AX-86298372, while no QTLs were detected for KL and KT across all 10 chromosomes. Four bulked groups of family lines, i.e., Groups I to IV, were constructed with F2:3 family lines according to the phenotypic comparisons of KWid between EHel and B73. Among these four groups, Group I possessed a significantly lower KWid than EHel (P = 0.0455), Group II was similar to EHel (P = 0.34), while both Group III and Group IV were statistically higher than EHel (P < 0.05). Besides, except Group IV exhibited a similar KWid to B73 (P = 0.11), KWid of Groups I to III were statistically lower than B73 (P < 0.00). By comparing the bulked genotypes of the four groups to EHel and B73, a stable chromosomal region on Chr9 between SNPs of AX-86298372 to AX-86263154, entirely covered by qKWid9, was identified to link KWid with the positive allele of increasing phenotypic effect to KWid from B73, similar to that of qKWid9. A large amount of enzyme activity and macromolecule binding-related genes were annotated within this chromosomal region, suggesting qKWid9 as a potential QTL for KWid in maize. 相似文献
898.
Duan Xiaojing Zhu Zhonglong Yang Yang Duan Jie Jia Zhongkui Chen Faju Sang Ziyang Ma Luyi 《Journal of Plant Growth Regulation》2022,41(1):227-235
Journal of Plant Growth Regulation - To improving the understand of the accumulation pattern of soluble sugars in Magnolia wufengensis during natural cold acclimation, the dynamics of freezing... 相似文献
899.
Li Wenjun Shen XiuFeng Feng Shenglan Liu Yue Zhao Huiying Zhou Guohao Sang Ming Sun Xiaodong Jiao Rong Liu Fuyuan 《Molecular biology reports》2022,49(9):8197-8207
Molecular Biology Reports - JQ1, a BRD4 inhibitor, first identified its therapeutic role in cancer, has gradually demonstrated a protective effect on the heart in recent years; however, it is... 相似文献
900.
Xia Xiu-Jiao Shen Hong Zhi Hui-Lin Zhong Yan Sang Bo Lv Wen-Wen Li Qiu-Ping Liu Ze-Hu 《Mycopathologia》2022,187(2-3):189-197
Mycopathologia - Deep cutaneous fungal infections including deep dermatophytosis are responsible for significant morbidity and mortality, especially in immunocompromised patients. Variable and... 相似文献