全文获取类型
收费全文 | 239篇 |
免费 | 8篇 |
专业分类
林业 | 16篇 |
农学 | 62篇 |
37篇 | |
综合类 | 17篇 |
农作物 | 14篇 |
水产渔业 | 5篇 |
畜牧兽医 | 68篇 |
园艺 | 6篇 |
植物保护 | 22篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2019年 | 8篇 |
2018年 | 7篇 |
2017年 | 4篇 |
2016年 | 5篇 |
2015年 | 6篇 |
2014年 | 9篇 |
2013年 | 12篇 |
2012年 | 10篇 |
2011年 | 10篇 |
2010年 | 12篇 |
2009年 | 5篇 |
2008年 | 9篇 |
2007年 | 5篇 |
2006年 | 9篇 |
2005年 | 3篇 |
2003年 | 3篇 |
2002年 | 8篇 |
2001年 | 5篇 |
2000年 | 9篇 |
1999年 | 3篇 |
1998年 | 5篇 |
1997年 | 5篇 |
1996年 | 5篇 |
1995年 | 5篇 |
1994年 | 5篇 |
1993年 | 6篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1987年 | 5篇 |
1985年 | 2篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1975年 | 4篇 |
1974年 | 8篇 |
1973年 | 1篇 |
1971年 | 4篇 |
1970年 | 1篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1967年 | 4篇 |
1966年 | 4篇 |
排序方式: 共有247条查询结果,搜索用时 15 毫秒
81.
Amritpal S. Singh A. Maxwell P. Jones Praveen K. Saxena 《Plant foods for human nutrition (Dordrecht, Netherlands)》2014,69(1):50-56
Thirty five commercial maple syrups from twelve producers in Southern Ontario were evaluated for properties including light transmittance, autofluorescence, density, pH, total soluble solids (TSS), glucose and fructose content, total phenol content, antioxidant potential and mineral content (Mg, Mn, P, Zn, Ca, K, Fe and Pb). A high degree of variability was found in many characteristics, often exceeding an order of magnitude. Syrups were categorized based on light transmission at 560 nm into amber (12), dark (13) and very dark (10) using International Maple Syrup Institute (IMSI) guidelines. No statistical differences were found among grades of syrup for density, pH, TSS, glucose, fructose, total reducing sugars, glucose:fructose ratio, magnesium, manganese or potassium. Darker syrups showed significantly higher autofluorescence, total phenol content, antioxidant potential, phosphorous, calcium and total mineral content. Significant negative correlations of percent transmission with total phenol content, antioxidant potential and total mineral content are reported. Significant positive correlations among total phenol content, antioxidant potential and total mineral content are also described. The results from this study suggest that darker syrups tend to contain more beneficial traits and may be applied in developing functional foods and value added products. 相似文献
82.
Integrated control of root-knot disease in three crop plants using chitin and Paecilomyces lilacinus
Paedlomyces lilacinus, a rhizospherc inhabiting nematophagous fungus, along with chitin was evaluated in sterilized soil for the suppression of Meloidogyne incognita, causal agent of root-knot disease in Solanum melongena, Lycopersicon esculentum and Cicer arietinum. The soil was subjected to various treatments. The plant growth after 30, 60 and 90 days was assessed in terms of shoot and root length, shoot and root fresh and dry wt. and number of galls/g root fresh wt. Combination of fungus with chitin enhanced suppression of Meloidogyne incognita more than using them alone. 相似文献
83.
Saplings of 12 species of common Indian trees were exposed to varying concentration of SO2 to determine the level of SO2 causing no injury, mild injury and severe injury in plants. The following order of sensitivity was emerged, T. indica > P. dulce > M. indica > F. rumphii > H. integrifolia > B. ceiba > F. bengalensis > A. indica > F. religiosa > S. cuminii > P. guajava > F. racemosa. SO2 sorption was extremely low in T. indica and M. indica while F. religiosa and F. racemosa exhibited best efficiency of SO2 Aorption. A correlation was found between the efficiency of SO2 sorption and alkalinity of cytoplasmic pH. Similarly plants rich in sulfite oxidase, in general, exhibited a better resistance. No single intrinsic factor could be held responsible for the manifested response of a tree towards SO2. 相似文献
84.
85.
Alpana Kulhari Arun Sheorayan Navneet Saxena Chander Mohan Manisha Mangal Ashok Chaudhury Ashok K. Dhawan Rajwant K. Kalia 《Genetic Resources and Crop Evolution》2013,60(3):1173-1180
The oleo-gum resin of Commiphora wightii (Arn.) Bhandari, a pharmacologically important balsamiferous woody shrub, has been used in treating various ailments and disorders since ancient times (2000 B.C.) due to the presence of steroidal compound guggulsterone. Two bioactive isomers of guggulsterone, E and Z, are responsible for lipid- and cholesterol-lowering and anti-cancerous activities. Further, guggul has been approved as food supplement by US-FDA as well as Council of Europe. Indiscriminate harvest of C. wightii from wild with negligible conservation efforts has lead to its inclusion in IUCN assemblage of endangered plant species. For identification of high guggulsterone yielding ecotypes of C. wightii, using high-performance thin-layer chromatographic (HPTLC) analysis, stem samples were collected from 50 plants from eleven locations in arid tracts of Haryana, Gujarat and Rajasthan. Dried, powdered material was subjected to extraction with petroleum ether using soxhlet apparatus. Samples were spotted on precoated activated silica plates (60F-254) and were developed using toluene–acetone (9:1 v/v) as mobile phase. The analysis was carried out in the absorbance mode at 250 nm using HPTLC scanner. The regression analysis data for the calibration plots for E and Z guggulsterone showed good linear relationship with R2 = 1 and 0.9897, respectively. Highest concentration of guggulsterone E (284 μg/g dry wt) was found in the accession collected from Palana, Bikaner whereas highest guggulsterone Z concentration (89.5 μg/g dry wt) was found in the accession collected from CAZRI, Jodhpur. 相似文献
86.
Vineet Kumar Anil K. GangwarDayamon D. Mathew MVSc Raja A. AhamadAbhishek C. Saxena MVSc Naveen Kumar MVSc PhD 《Journal of Equine Veterinary Science》2013
The aim of the present study was to evaluate acellular dermal matrix (ADM) of rat origin for the repair of ventral hernia in horses. The skin from rats, to be used as a graft, was de-epithelialized using hypertonic solution and further decellularized with 0.5% sodium dodecyl sulfate and 0.25% tri-(n-butyl)-phosphate. Under general anesthesia, the hernial ring was exposed and repaired with the ADM graft using inlay graft technique. Blood samples were collected at postimplantation days 0, 15, and 30 and were used for sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis to assess the serum protein concentration of the animals, as well as for gelatin zymography for the identification of matrix metalloproteinases. All animals had an uneventful recovery without clinical signs of wound dehiscence, infection, or recurrence of hernias during 6-month follow-up period. Sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis of concentration of the serum proteins revealed that this was increased at day 15 and had decreased again at day 30. Gelatin zymography showed only one major band of 92 kDa in the serum of all the horses with the implant, but the relative amount of 92 kDa was higher at day 15 as compared with day 0 and day 30. It may be concluded that ADM of rat origin can be used safely in horses for repair of ventral hernia. 相似文献
87.
88.
Nalini Mallikarjuna Kulbushan Saxena Jhansi Lakshmi Rajeev Varshney Sandhya Srikanth Deepak Jadhav 《Genetic Resources and Crop Evolution》2012,59(3):411-417
A study was undertaken to know the difference/diversity between pigeonpea and its closely related wild species C. cajanifolius by studying their morphology, crossability, cytology of the hybrid between the two, and molecular studies. Studies revealed
that there are at least 5–6 traits that separate the two species such as flower morphology, pod color and morphology, pod
constriction, seed color and strophiole, 100 seed weight that separate C. cajan from C. cajanifolius. Molecular studies revealed that a genetic dissimilarity index value ranging from 0.81 to 0.94 exists between the two species. 相似文献
89.
Dabas A Nagpure NS Kumar R Kushwaha B Kumar P Lakra WS 《Fish physiology and biochemistry》2012,38(2):469-482
The effects of different concentrations of cadmium chloride on the extent of lipid peroxidation (LPO) and alterations in the
antioxidant enzyme activities were studied in liver, kidney and gill tissues of freshwater murrel, Channa punctatus. The fish specimens were exposed to 6.7, 13.4 and 20.1 mg l−1 sublethal concentrations of cadmium chloride and the oxidative stress was assessed after 24, 48, 72 and 96 h post-exposure.
The biomarkers selected for the study were thiobarbituric acid reactive substances for assessing the extent of lipid peroxidation
and antioxidant defense system such as reduced glutathione (GSH), glutathione reductase (GR), glutathione peroxidase (GPX), glutathione-S-transferase (GST), catalase (CAT) and superoxide dismutase (SOD) activities. In general, the cadmium exposure
elevated the LPO in subject tissues of treated group and modulated the activities of GPx, GST, SOD, CAT, GR and level of GSH
after given exposure as compared to the control. All enzymes activities, except CAT (in kidney and gills), and amount of LPO
elevated significantly (P < 0.05) in treated group with respect to control in all tissues, while significant difference was not observed between the
exposed concentrations and within exposure duration. The results indicated that increase in LPO level and the fluctuation
in antioxidant defense system in fish could be due to cadmium-induced increase in the production of reactive oxygen species
(ROS). The potential role of these parameters as biomarkers of heavy metal pollution in aquatic system is discussed. 相似文献
90.
Seleman R. Kaoneka Rachit K. Saxena Said N. Silim Damaris A. Odeny Nadigatla Veera Prabha Rama Ganga Rao Hussein A. Shimelis Moses Siambi Rajeev K. Varshney 《Plant Breeding》2016,135(2):148-154
Pigeonpea (Cajanus cajan [L.] Millspaugh) is an important multipurpose grain legume crop primarily grown in tropical and subtropical areas of Asia, Africa and Latin America. In Africa, the crop is grown for several purposes including food security, income generation, livestock feed and in agroforestry. Production in Eastern and Southern Africa (ESA) is however faced with many challenges including limited use of high‐yielding cultivars, diseases and pests, drought, under‐investment in research and lack of scientific expertise. The aim of this review is to highlight the challenges facing pigeonpea breeding research in ESA and the existing opportunities for improving the overall pigeonpea subsector in the region. We discuss the potential of the recently available pigeonpea genomic resources for accelerated molecular breeding, the prospects for conventional breeding and commercial hybrid pigeonpea, and the relevant seed policies, among others, which are viewed as opportunities to enhance pigeonpea productivity. 相似文献