全文获取类型
收费全文 | 120篇 |
免费 | 6篇 |
专业分类
林业 | 16篇 |
农学 | 3篇 |
基础科学 | 2篇 |
23篇 | |
综合类 | 6篇 |
农作物 | 22篇 |
水产渔业 | 18篇 |
畜牧兽医 | 30篇 |
园艺 | 2篇 |
植物保护 | 4篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 4篇 |
2020年 | 11篇 |
2019年 | 5篇 |
2018年 | 11篇 |
2017年 | 9篇 |
2016年 | 7篇 |
2015年 | 1篇 |
2014年 | 13篇 |
2013年 | 8篇 |
2012年 | 13篇 |
2011年 | 8篇 |
2010年 | 7篇 |
2009年 | 3篇 |
2008年 | 8篇 |
2007年 | 4篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2002年 | 3篇 |
2001年 | 1篇 |
1999年 | 1篇 |
1992年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有126条查询结果,搜索用时 15 毫秒
101.
The growth and morphological development including fins, spine distribution and pigmentation of larval and juvenile of hatchery‐reared yellow puffer, Chonerhinos naritus were described to provide essential information on the early life history of this species. The total length (TL) of newly hatched larvae was 3.42 ± 0.23 (mean ± SD) mm, reaching 5.66 ± 0.38 mm on 5 days after hatched (DAH), 7.80 ± 0.28 mm on 11 DAH, 9.88 ± 0.40 mm on 27 DAH and 10.92 ± 0.58 mm on 30 DAH. The yolk was completely absorbed in preflexion larvae at 4 DAH. The mouth opening started at 3 DAH of yolk sac larvae, while the teeth appeared starting from preflexion larvae at 7 DAH. Overall aggregate fin ray numbers including caudal fin attained full complement in postflexion larvae at 27 DAH. Several melanophores with appearance of small stellate were first appeared dorsally on the head of flexion larvae at 13 DAH, expanded at the dorsal region of the head, above the eye in juveniles at 30 DAH. The spines first appeared in preflexion larvae of C. naritus at 7 DAH, covering the ventral skin region below pectoral fin base and expanded to the ventral part of the body and nearly covered the whole abdomen region before the anus and below the eyes in juveniles. C. naritus remain as larvae for approximately 29 days, during which they metamorphose to the juvenile stage prior to sexual maturation. Observations in larvae development of C. naritus revealed similar characteristics with other Tetraodontidae species. 相似文献
102.
A 60-day feeding experiment was carried out on juvenile Iranian sturgeon (Acipenser persicus) to evaluate the effects of different percentages of canola oil and fish oil containing n-3 highly unsaturated fatty acids
(n-3 HUFA) on fish growth and fatty acid composition. The requirement for n-3 HUFA of juvenile Iranian sturgeon (48.4 ± 1.98 g)
was studied by feeding the fish with various diets containing six different percentage of n-3 HUFA ranging from 1.56 to 17.25
(% of total fatty acids). Neither the weight gain, feed conversion ratio, condition factor, specific growth rate nor the protein
efficiency ratio showed any significant differences between the dietary treatments nor in the body composition of juvenile
Iranian sturgeon (P > 0.05); also there were no significant difference with respect to the effect of the dietary treatment (P > 0.05) on the blood parameters, for the content of plasma protein, glucose, cholesterol, and triglyceride. The fatty acid
composition of the carcass of the Iranian sturgeon fed with the diets containing various levels of n-3 HUFA was reflected
by the dietary fatty acid composition. The content of n-3 HUFA in the fish increased with an increase in dietary n-3 HUFA
levels. The results indicate that the dietary n-3 HUFA had no effect on the growth of juvenile Iranian sturgeon. 相似文献
103.
104.
Guilan is one of the main province olive oil producers in Iran. The culture of olive trees is of considerable importance. One problem that affects Iran olive orchards is a disease bacterial canker caused by Pseudomonas syringae pv. syringae. In this research, the bacterium was recovered from sunken brown stem lesions on 2-year-old olive trees cv. Marie, during survey from olive orchards in different areas of Guilan province. Samples were taken from infected tissues and were washed with sterile distilled water and crushed in peptone water. Then 50 μl of the extract was cultured on NA and King's B medium containing cyclohexamid antibiotic (50 μg/ml). After 48–72 h, bacterial colonies were selected. Based on morphological, physiological, biochemical, pathogenicity properties and PCR methods with specific primers the predominant pathogenic type was identified as P. s. pv. syringae. This is the first report of the existence of P. s. pv. syringae on olive trees in Iran. 相似文献
105.
Ye Heng Lim Hooi Ling Foo Teck Chwen Loh Rosfarizan Mohamad Norhani Abdullah 《畜牧与生物技术杂志(英文版)》2019,(3)
Background: Increasing understanding on the functions of amino acids(AA) has led to new commercial applications and expansion of the worldwide markets. However, the current technologies rely heavily on non-food grade microorganism and chemical synthesis for the production of AA. Several studies reported that lactic acid bacteria(LAB) have the capability of producing AA owing to their well-established proteolytic system and amino acid biosynthesis genes. Hence, the objectives of this study were to explore the extracellular proteolytic activity of LAB isolated from various Malaysian fermented foods and their potential to produce AA extracellularly as feed supplements.Results: Al the studied LAB isolates were versatile extracel ular protease producers, whereby extracel ular protease activities were detected from acidic to alkaline pH(pH 5, pH 6.5, pH 8) using qualitative and quantitative proteolytic assays.The highest proteolytic activity at pH 5(15.76 U/mg) and pH 8(19.42 U/mg) was achieved by Lactobacil us plantarum RG14, while Lactobacil us plantarum RS5 exhibited the highest proteolytic activity of 17.22 U/mg at pH 6.5. As for the results of AA production conducted in de Man, Rogosa and Sharpe medium and analysed by high pressure liquid chromatography system, al LAB isolates were capable of producing an array of AA. General y, Pediococcus sp. showed greater ability for AA production as compared to Lactobacil us sp. Moreover, the studied LAB were able to produce a few major feed supplement AA such as methionine, lysine, threonine and tryptophan. P. pentosaceus TL-3 recorded the highest methionine and threonine productivity of 3.72 mg/L/h and 5.58 mg/L/h respectively. However, L. plantarum I-UL4 demonstrated a lysine productivity of 1.24 mg/L/h, while P. acidilactici TP-6 achieved up to 1.73 mg/L/h of tryptophan productivity.Conclusion: Al the 17 studied LAB isolates possessed versatile extracel ular proteolytic system and have vast capability of producing various amino acids including a few major feed supplement AA such as methionine, lysine, threonine and tryptophan. Despite AA production was strain dependent, the studied LAB isolates possessed vast potential and can be exploited further as a bio-agent or an alternative amino acids and bioactive peptide producers. 相似文献
106.
Mohamad Hesam Shahrajabian Wenli Sun Hong Shen 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2020,70(5):437-443
ABSTRACT Chinese herbs and plants have been used as traditional medicine, immune system booster for human being for thousands of years in China and other parts of Asia. Seven coronaviruses are known to infect humans, three of them are serious which are SARS (severe acute respiratory syndrome), MERS (Middle East respiratory syndrome), and SARS-CoV-2 (Covid-19). In this mini-review article, we have mentioned the key role some of the most important plants with antiviral activities and herbs against SARS and SARS-CoV-2 on the basis of traditional Chinese medicine. 相似文献
107.
Deng H Grunder S Cordova KE Valente C Furukawa H Hmadeh M Gándara F Whalley AC Liu Z Asahina S Kazumori H O'Keeffe M Terasaki O Stoddart JF Yaghi OM 《Science (New York, N.Y.)》2012,336(6084):1018-1023
We report a strategy to expand the pore aperture of metal-organic frameworks (MOFs) into a previously unattained size regime (>32 angstroms). Specifically, the systematic expansion of a well-known MOF structure, MOF-74, from its original link of one phenylene ring (I) to two, three, four, five, six, seven, nine, and eleven (II to XI, respectively), afforded an isoreticular series of MOF-74 structures (termed IRMOF-74-I to XI) with pore apertures ranging from 14 to 98 angstroms. All members of this series have noninterpenetrating structures and exhibit robust architectures, as evidenced by their permanent porosity and high thermal stability (up to 300°C). The pore apertures of an oligoethylene glycol-functionalized IRMOF-74-VII and IRMOF-74-IX are large enough for natural proteins to enter the pores. 相似文献
108.
109.
A. Wibowo N. Ahmat A.S. Hamzah A.L.M. Low S.A.S. Mohamad H.Y. Khong A.S. Sufian N. Manshoor H. Takayama 《Fitoterapia》2012
A new oligostilbenoid tetramer, malaysianol B (1), was isolated from the acetone extract of the stem bark of Dryobalanops lanceolata along with seven oligostilbenoids tetramers; hopeaphenol (2), stenophyllol A (3), nepalensinol B (4), vaticanol B (5) and C (6), upunaphenol D (7), and flexuosol A (8). The structures of the isolated compounds were established on the basis of their spectroscopic data evidence. The antibacterial activity of the isolated compounds was evaluated using resazurin microtitre-plate assay. 相似文献
110.
Khalil Rezaei Bernard Guest Anke Friedrich Farajollah Fayazi Mohamad Nakhaei Seyed Mahmoud Fatemi Aghda Ali Beitollahi 《Journal of Soils and Sediments》2009,9(1):23-32