全文获取类型
收费全文 | 326篇 |
免费 | 11篇 |
国内免费 | 2篇 |
专业分类
林业 | 16篇 |
农学 | 12篇 |
基础科学 | 3篇 |
69篇 | |
综合类 | 28篇 |
农作物 | 47篇 |
水产渔业 | 34篇 |
畜牧兽医 | 63篇 |
园艺 | 8篇 |
植物保护 | 59篇 |
出版年
2023年 | 2篇 |
2022年 | 8篇 |
2021年 | 9篇 |
2020年 | 16篇 |
2019年 | 15篇 |
2018年 | 26篇 |
2017年 | 23篇 |
2016年 | 13篇 |
2015年 | 12篇 |
2014年 | 13篇 |
2013年 | 38篇 |
2012年 | 18篇 |
2011年 | 24篇 |
2010年 | 17篇 |
2009年 | 10篇 |
2008年 | 11篇 |
2007年 | 10篇 |
2006年 | 5篇 |
2005年 | 6篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 5篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 7篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 6篇 |
1987年 | 3篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1962年 | 1篇 |
排序方式: 共有339条查询结果,搜索用时 0 毫秒
61.
62.
Bintong Yang Dongxing Zhang Tonglei Wu Zhiqiang Zhang Sayed Haidar Abbas Raza Nicola Schreurs Lei Zhang Guilian Yang Chunfeng Wang Aidong Qian Yuanhuan Kang Xiaofeng Shan 《Journal of fish diseases》2019,42(3):379-389
Aeromonas veronii is one of the main pathogens causing freshwater fish sepsis and ulcer syndrome. More and more cases have shown that it has become an important zoonotic and aquatic agent. In this study, a A. veronii TH0426 mutant strain (ΔlamB) with an in‐frame deletion removed nucleotides 10–1,296 of the lamB gene was firstly constructed to investigate its functions. The results showed that the LD50 value of the mutant ΔlamB to zebrafish and mice was 13.7‐fold and 5.6‐fold higher than those of the wild‐type strain, respectively. The toxicity of wild‐type strain to EPC cells was 2.1‐fold and threefold higher than those of ?lamB when infected for 1 and 2 hr. Furthermore, the ability of biofilm formation and the adhesion and invasion to EPC cells of ?lamB significantly decreased for 5.6‐fold and 1.8‐fold separately. In addition, motility detection result indicated that ?lamB lost the swimming ability. The results of flagellar staining and TEM demonstrated that the flagella of ?lamB were shed. In general, the deletion of lamB gene caused a significant decrease in the virulence and adhesion of A. veronii TH0426, and it can be known that the lamB gene of A. veronii plays a crucial role in the pathogenesis. 相似文献
63.
Amir Abbas Bazyar Lakeh Hamid Farahmand Werner Kloas Alireza Mirvaghefi Achim Trubiroha Brian C. Peterson Sven Wuertz 《Aquaculture International》2016,24(1):11-21
Juvenile rainbow trout (Oncorhynchus mykiss) were passively immunized by intraperitoneal immunization against somatostatin-14 (SS-14) using an antibody originating from egg-laying chicken (Gallus domesticus). Fish were immunized weekly (0, 7, 14, 21, 28, 35 days) with chicken egg yolk-derived immunoglobulin (IgY) against SS-14 (1:25 IgY, 5 mg mL?1), and growth performance, feed utilization as well as plasma concentrations and mRNA levels of growth hormone (GH) and insulin-like growth factor I (IGF-I) were compared to the control group that received placebo immunization with PBS. Passive immunization significantly increased weight gain of treated fish (67.7 ± 7.4 g) compared to the control group (40.1 ± 2.0 g) after 35 days (p < 0.05). Feed conversion ratio (FCR) was significantly improved in the immunized fish (0.7 ± 0.08) compared to control group (1.2 ± 0.06) (p < 0.05). The concentrations of GH and IGF-I in the blood plasma showed no significant differences between the fish treated with anti-SS-14 and those of control during the treatment (p > 0.05). In both groups, GH levels decreased over the 35 days of the experiment (p < 0.05). However, IGF-I level during the period of treatment remained unchanged in both control and immunized fish with the anti-SS-14. Similarly, no changes were observed in pituitary GH and liver IGF-I mRNA levels between treatment and control at each sampling time (p > 0.05). There was no indication of a cumulative, long-lasting effect of repeated immunization on GH or IGF-I plasma concentrations or mRNA expression. The present study shows that a passive immunization of rainbow trout against SS-14 using a chicken egg yolk-derived SS-14 antibody could increase growth rate and improved FCR. 相似文献
64.
Xiaoyun Zhou Khalid Abbas Mingyun Li Libao Fang Su Li Weimin Wang 《Aquaculture International》2010,18(3):349-359
To determine the cytotype with better traits for the aquaculture practices of the dojo loach Misgurnus anguillicaudatus from the viewpoint of fish farming improvement, factorial crosses (2n♀ × 2n♂, 2n♀ × 4n♂, 4n♀ × 2n♂, 4n♀ × 4n♂) were conducted
between natural diploids (D) and tetraploids (T), producing DD, DT, TD, and TT groups (female listed first). The potential
benefits of the different cytotypes in culture were evaluated by comparing growth performance and survival rate for a 15-month
rearing trial under the same production conditions. The average fertilization rate in DT and TT was significantly lower than
in the DD and TD groups, possibly indicating the poor fertilizing capacity of the tetraploid sires. Survival rate in DT and
TD was slightly lower than in DD but significantly higher than in the TT groups. Tetraploid females produced obviously larger
eggs than diploids and, subsequently, significantly longer initial body length of TT and TD than DD and DT fry. However, from
the second month of the growth trial, TT suffered higher mortality than other cytotypes, which significantly influenced morphometric
growth parameters. The TD group exhibited superior growth performance throughout the experiment. The mean body length of DT
was comparable with that of DD fish during the first 7 months but began to outgrow DD from the 9th month. This study suggests
that the relatively better growth of tetraploid and higher survival rate of diploid can be integrated via inter-ploidy hybridization
to get TD triploids with better culture traits. 相似文献
65.
Alireza Hadipour Majid Azizi Hasanali Naghdi-Badi Jaber Panahandeh Abbas Delazar Hosein Aroei 《The Journal of Horticultural Science and Biotechnology》2016,91(1):55-62
A karyotype study was performed on 15 populations of Eremostachys laciniata Bunge from Iran in order to quantify the extent of cytological variation for use in breeding programmes. Ten mitotic root tip cells at the metaphase stage were prepared from each population by the squash method. The chromosomes of suitable mitotic cells were counted and various parameters, including long and short arm lengths, chromosome lengths, total length of the haploid chromosome complement, arm ratios, and the centromeric index, were measured. All 15 populations were diploid with 2n = 2x = 22 and were differentiated by their karyotypic parameters. All 15 E. laciniata populations occupied Class 1A of Stebbins’ karyotype classification, indicating the presence of a primitive symmetrical karyotype. The size of the mitotic chromosomes was medium, and mean chromosome lengths ranged from 3.84 to 4.77 μm. The shortest chromosome lengths were observed in the Ajabshir population and the longest in the Heydarabad population. The Heydarabad population also had the longest total chromosome length and the Ajabshir population had the shortest total chromosome length. The centromeric indices of the chromosome complements varied from 39.3% to 43.7%. Metacentric chromosomes were the most common in all populations, whereas submetacentric chromosomes were rare. The A1 index varied from 0.215 (Areshtanab) to 0.337 (Til). The A2 index ranged from 0.116 (Til) to 0.143 (Kaleybar), and the karyotype asymmetry index varied between 0.051 and 0.097. The results of a principal component analysis (PCA) showed that the main elements of the first three main principal components accounted for 97% of the total variance. Cluster analysis by Ward’s method indicated that all 15 populations could be classified into three clusters. Finally, the results of the karyotypic parameters showed that the Til, Heydarabad, and Marand populations had higher levels of karyotypic heterogeneity and may be useful when developing breeding programmes. 相似文献
66.
采自哈纳斯的新疆新记录的地衣 总被引:8,自引:1,他引:8
报道了1996年7月在哈纳斯自然保护区及其附近所采到的新疆新记录地衣12种,其中1种1属为地知地衣,另11种隶属于11个属,6科。 相似文献
67.
托木尔峰自然保护区地衣的补充研究 总被引:6,自引:0,他引:6
我们根据多年的研究并结合前人的工作进一步地整理了分布在新疆托木尔峰自然保护区的地衣种类。分析该地区的地衣种有120个,分别隶性于49属,其中有11个变种和4个变型。调查中我们还发现该地区地衣随着海拔高度的升高而有所不同,北坡和南坡也有明显的差异。 相似文献
68.
Fatemeh RAJAEI Abbas E SARI Abdolrassoul SALMANMAHINY Timothy O RANDHIR Majid DELAVAR Reza D BEHROOZ Alireza M BAVANI 《干旱区科学》2018,10(3):457-469
Conversion of forest land to farmland in the Hyrcanian forest of northern Iran increases the nutrient input, especially the phosphorus(P) nutrient, thus impacting the water quality. Modeling the effect of forest loss on surface water quality provides valuable information for forest management. This study predicts the future impacts of forest loss between 2010 and 2040 on P loading in the Tajan River watershed at the sub-watershed level. To understand drivers of the land cover, we used Land Change Modeler(LCM) combining with the Soil Water Assessment Tool(SWAT) model to simulate the impacts of land use change on P loading. We characterized priority management areas for locating comprehensive and cost-effective management practices at the sub-watershed level. Results show that agricultural expansion has led to an intense deforestation. During the future period 2010–2040, forest area is expected to decrease by 34,739 hm~2. And the areas of pasture and agriculture are expected to increase by 7668 and 27,071 hm~2, respectively. In most sub-watersheds, P pollution will be intensified with the increase in deforestation by the year 2040. And the P concentration is expected to increase from 0.08 to 2.30 mg/L in all of sub-watersheds by the year 2040. It should be noted that the phosphorous concentration exceeds the American Public Health Association′s water quality standard of 0.2 mg/L for P in drinking water in both current and future scenarios in the Tajan River watershed. Only 30% of sub-watersheds will comply with the water quality standards by the year 2040. The finding of the present study highlights the importance of conserving forest area to maintain a stable water quality. 相似文献
69.
M. F. Abbas J. H. Al-Niami E. A. Al-Sareh 《The Journal of Horticultural Science and Biotechnology》2013,88(5):627-629
Mature green jujube fruits of cv. Zaytoni were subjected to gamma radiation doses of 0, 10, 30 and 50 krad. The irradiated and unirradiated fruits were then kept at 20°C and 85-90% r.h., and changes in weight loss, total soluble solids, titratable acidity and ascorbic acid content were determined. Fruits subjected to 30 krad were firmer and greener than unirradiated control fruits after six days of storage, and this treatment delayed ripening by three days. There was no significant loss in the nutritive value of the fruit due to irradiation. 相似文献
70.
在哈纳斯地区地衣研究的基础上,主要分析石蕊科(Cladoniaceae)地衣的地理区系成分、生态分类,并对保护区环境保护,发展旅游业,生物资源开发与保护和生物多样性研究提供科学依据与参考. 相似文献