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排序方式: 共有609条查询结果,搜索用时 31 毫秒
1.
氯化血红素胶囊的研制及临床疗效   总被引:18,自引:0,他引:18  
袁曦  林建生 《中国药房》1996,7(1):17-18
本文介绍了氯化血红素胶囊的制备工艺、质量标准、药效学、稳定性及临床疗效观察。经临床治疗缺铁性贫血(IDA)患者120例,取得显著疗效,其中治愈率为60.9%,总有效率为96.2%,无胃肠道副作用,是一种治疗IDA理想的新型铁剂。  相似文献
2.
Chronic exposure to the divalent heavy metals, such as iron, lead, manganese (Mn), and chromium, has been linked to the development of severe, often irreversible neurological disorders and increased vulnerability to developing Parkinson's disease. Although the mechanisms by which these metals elicit or facilitate neuronal cell death are not well defined, neurotoxicity is limited by the extent to which they are transported across the blood-brain barrier and their subsequent uptake within targeted neurons. Once inside the neuron, these heavy metals provoke a series of biochemical and molecular events leading to cell death induced by either apoptosis and/or necrosis. The toxicological properties of Mn have been studied extensively in recent years because of the potential health risk created by increased atmospheric levels owing to the impending use of the gas additive methylcyclopentadienyl manganese tricarbonyl. Individuals exposed to high environmental levels of Mn, which include miners, welders, and those living near ferroalloy processing plants, display a syndrome known as manganism, best characterized by debilitating symptoms resembling those of Parkinson's disease. Mn disposition in vivo is influenced by dietary iron intake and stores within the body since the two metals compete for the same binding protein in serum (transferrin) and subsequent transport systems (divalent metal transporter, DMT1). There appear to be two distinct carrier-mediated transport systems for Mn and ferrous ion: a transferrin-dependent and a transferrin-independent pathway, both of which utilize DMT1 as the transport protein. Accordingly, this commentary focuses on the biochemical and molecular processes responsible for the cytotoxic actions of Mn and the role that cellular transport plays in mediating the physiological as well as the toxicological actions of this metal.  相似文献
3.
Iron metabolism and toxicity   总被引:14,自引:0,他引:14  
Iron is an essential nutrient with limited bioavailability. When present in excess, iron poses a threat to cells and tissues, and therefore iron homeostasis has to be tightly controlled. Iron's toxicity is largely based on its ability to catalyze the generation of radicals, which attack and damage cellular macromolecules and promote cell death and tissue injury. This is lucidly illustrated in diseases of iron overload, such as hereditary hemochromatosis or transfusional siderosis, where excessive iron accumulation results in tissue damage and organ failure. Pathological iron accumulation in the liver has also been linked to the development of hepatocellular cancer. Here we provide a background on the biology and toxicity of iron and the basic concepts of iron homeostasis at the cellular and systemic level. In addition, we provide an overview of the various disorders of iron overload, which are directly linked to iron's toxicity. Finally, we discuss the potential role of iron in malignant transformation and cancer.  相似文献
4.
生血宁片治疗儿童缺铁性贫血150例   总被引:11,自引:0,他引:11  
目的:观察生血宁片对儿童缺铁性贫血患者的临床疗效和不良反应。方法:共210例患者随机分为治疗组150例,予生血宁片0.252g,tid,po;对照组60例,予琥珀酸亚铁片0.1g,tid,po。均连服4周。结果:生血宁片治疗150例儿童缺铁性贫血患者中显效98例,有效42例,显效率与总有效率分别为68.67%与94.00%,与阳性照药无显著差异。结论:生血宁片疗效显著,无明显不良反应。  相似文献
5.
用Fura—2/AM测定细胞内钙离子浓度,结果表明,5种海马提取物对L—谷氨酸致大鼠神经元钙内流有明显的抑制作用。其中大海马H.kuda的抑制作用最强,日本海马作用最弱,这与传统药材质量评价相一致。  相似文献
6.
Effect of natural phenolic acids on DNA oxidation in vitro   总被引:10,自引:0,他引:10  
We examined the antioxidant activity of the following natural phenolic compounds present in food: 3-OH-benzoic acid (3-OH-BA); 4-OH-benzoic acid (4-OH-BA); 2,3-dihydroxybenzoic acid (2,3-diOH-BA); 3,4-dihydroxybenzoic acid (3,4-diOH-BA or protocatechuic acid); ferulic acid; caffeic acid; and 2-coumaric, 3-coumaric and 4-coumaric acids. We measured the inhibitory effect of these compounds on iron-dependent oxidative DNA damage in vitro [incubating herring sperm DNA with Fe(III)/GSH] or using cumene hydroperoxide (CumOOH) as a free-radical generating system; we also studied the interaction of these phenols with Fe(II) or Fe(III) spectrophotometrically. Among the tested compounds, 2,3-diOH-BA, 3,4-diOH-BA and caffeic acid interacted with Fe(II) and showed a potent inhibitory effect on iron-induced oxidative DNA damage. CumOOH-induced DNA oxidation was not modified by these compounds. On the contrary, 2-coumaric, 3-coumaric and 4-coumaric acids did not interact with iron but protected against oxidative DNA damage induced by Fe(III)/GSH and by CumOOH, indicating a direct free-radical scavenging activity of these compounds in both systems. The IC50±S.E.M. of the three coumaric acids against CumOOH-induced DNA oxidation was 44.2±2.0, 54.7±2.0 and 33.1±1.0 μ , respectively. On the contrary, 3-OH-BA and 4-OH-BA did not have scavenging activity and 3-OH-BA actually enhanced oxidative DNA damage. In conclusion, some natural phenolic acids, commonly present in food, have interesting protective activity against DNA oxidation in vitro and deserve further consideration as effective antioxidants in vivo.  相似文献
7.
Tannic acid, propyl gallate and methyl gallate, but not gallic acid, were found to be inhibitory to the growth of intestinal bacteria Bacteroides fragilis ATCC 25285, Clostridium clostridiiforme ATCC 25537, C. perfringens ATCC 13124, C. paraputrificum ATCC 25780, Escherichia coli ATCC 25922, Enterobacter cloacae ATCC 13047, Salmonella typhimurium TA98 and S. typhimurium YG1041 at 100–1000 μg/ml in culture broth. Neither Bifidobacterium infantis ATCC 15697 nor Lactobacillus acidophilus ATCC 4356 was inhibited by any of the above compounds up to 500 μg/ml. Tannic acid has a much greater relative binding efficiency to iron than propyl gallate, methyl gallate or gallic acid. The inhibitory effect of tannic acid to the growth of intestinal bacteria may be due to the strong iron binding capacity of tannic acid; whereas the effect of propyl gallate and methyl gallate probably occurs by a different mechanism. The growth of E. coli was restored by the addition of iron to the medium after the precipitate caused by tannic acid was removed. Neither B. infantis nor L. acidophilus require iron for growth. This probably contributes to their resistance to tannic acid. Because tannins are abundant in the human diet, tannins may affect the growth of some intestinal bacteria and thus may have an impact on human health.  相似文献
8.
多糖铁胶囊市场推广策划分析   总被引:9,自引:0,他引:9  
马慧民  曹庆弘 《中国药房》2003,14(10):584-586
目的:为某医药企业开发的新产品——多糖铁胶囊上市推广进行策划分析。方法:分析贫血药物市场潜力及消费和竞争对手情况,并以SWOT分析法分析了该企业的整体市场营销环境,结果与结论:提出了具有参考价值的可行性营销策略,强调了在实施过程中应注意的几个问题。  相似文献
9.
纳米级四氧化三铁的药物动力学和组织分布研究   总被引:8,自引:0,他引:8  
目的研究纳米级四氧化三铁在家兔体内的药物动力学和在小鼠体内的分布与排泄.方法将纳米级四氧化三铁静脉注射到家兔体内,用原子吸收光谱法测量血药浓度,将血药浓度时间数据用3P87程序拟合,计算出药物动力学参数.另将纳米级四氧化三铁注入小鼠体内,测量小鼠不同脏器中的铁含量.收集给药后48 h内的尿液和粪便,测量其中的铁含量.结果家兔静脉注射四氧化三铁后呈双室模型代谢.四氧化三铁在小鼠体内主要分布在肝脏和脾脏等网状内皮细胞和吞噬细胞较多的脏器,并且在小鼠体内排泄缓慢.结论四氧化三铁在家兔体内呈双室模型代谢,在体内的分布依次为:肝脏、脾脏、心脏和肾脏.  相似文献
10.
Brain barrier systems: a new frontier in metal neurotoxicological research   总被引:7,自引:0,他引:7  
The concept of brain barriers or a brain barrier system embraces the blood-brain interface, referred to as the blood-brain barrier, and the blood-cerebrospinal fluid (CSF) interface, referred to as the blood-CSF barrier. These brain barriers protect the CNS against chemical insults, by different complementary mechanisms. Toxic metal molecules can either bypass these mechanisms or be sequestered in and therefore potentially deleterious to brain barriers. Supportive evidence suggests that damage to blood-brain interfaces can lead to chemical-induced neurotoxicities. This review article examines the unique structure, specialization, and function of the brain barrier system, with particular emphasis on its toxicological implications. Typical examples of metal transport and toxicity at the barriers, such as lead (Pb), mercury (Hg), iron (Fe), and manganese (Mn), are discussed in detail with a special focus on the relevance to their toxic neurological consequences. Based on these discussions, the emerging research needs, such as construction of the new concept of blood-brain regional barriers, understanding of chemical effect on aged or immature barriers, and elucidation of the susceptibility of tight junctions to toxicants, are identified and addressed in this newly evolving field of neurotoxicology. They represent both clear challenges and fruitful research domains not only in neurotoxicology, but also in neurophysiology and pharmacology.  相似文献
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