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71.
A combined ultracentrifugationl/precipitation method for the measurement of lipoprotein cholesterol concentrations was developed and validated for use with canine plasma. Very low density lipoproteins (VLDL) were isolated by flotation ultracentrifugation and low density lipoproteins (LDL) separated from high density lipoproteins (HDL) by precipitation with heparin-manganese chloride. Effective separation of these classes was confirmed by agarose gel electrophoresis of native lipoproteins and by sodium dodecyl sulphate polyacrylamide gel electrophoresis of their apolipoprotein distributions. There was trace contamination of the LDL precipitate with HDL, but this represented less than 4 and 9 per cent of the total plasma HDL in normo- and hypercholesterolaemic dogs, respectively. The intra-assay and interassay coefficients of variation for LDL- and HDL-cholesterol concentrations were between 3·3 and 6·9 per cent, and 7·2 and 9·0 per cent, respectively, for plasma cholesterol concentrations between 2·67 and 8·14 mmoll/litre. The intra-assay coefficient of variation for VLDL-cholesterol was 53·8 and 18·4 per cent at plasma cholesterol concentrations of 2·67 and 8·14 mmol/litre, respectively. The interassay coefficient of variation for VLDL was 22·5 per cent. Storage of plasma at -20°C for between two and eight weeks did not affect VLDL-cholesterol concentrations, but led to an increase in LDL-cholesterol and a decrease in HDL-cholesterol concentrations of approximately 10 per cent. The method described is appropriate for the measurement of lipoprotein concentrations in plasma from normo- and hypercholesterolaemic dogs, but samples should not be subjected to prolonged storage before analysis. 相似文献
72.
J L Becht R D Park S L Kraft P F Steyn R H Wrigley 《Veterinary Clinics of North America: Equine Practice》2001,17(1):1-18
Effective radiographic interpretation requires a veterinarian who is knowledgeable of equine limb anatomy and the various principles that affect the resulting image. The normal and its variations must be recognized and understood before the abnormal can be confidently identified as pathologic. Proper patient positioning and sound radiographic technique are mandatory if reliable diagnostic radiographs are to be produced. This review emphasizes equine foot radiographic variations of normal and pseudolesions that occur with commonly used radiographic views performed in equine practice. 相似文献
73.
Sandy‐textured Mediterranean soils are invariably depleted in organic matter and supply only small amounts of N to crops. To compensate for these deficiencies, we tested the N supply from six organic wastes applied to a Cambic Arenosol in pots growing ryegrass. The results showed that the behaviour of the wastes in supplying N to a ryegrass crop grown in this soil can be predicted by observing their performance in laboratory aerobic incubations. The N made available during these incubations fitted well to a one‐pool kinetic model. 相似文献
74.
N. Fenner D. J. Dowrick M. A. Lock C. R. Rafarel & C. Freeman 《Soil Use and Management》2006,22(3):267-273
The temperature dependence of chemical reaction rates and microbial metabolism mean that temperature is a key factor regulating soil trace gas emissions and hydrochemistry. Here we evaluated a novel approach for studying the thermal response of soils, by examining the effects of temperature on gas emissions and hydrochemistry in (a) peat and (b) soil from a Sitka spruce plantation. A thermal gradient was applied along an aluminium bar, allowing soil to be incubated contemporaneously from 2 to 18 °C. The approach demonstrated clear differences in the biogeochemical responses of the two soil types to warming. The peat showed no significant emission of CH4 at temperatures below 6 °C, while above 6 °C, a marked increase in the rate of release was apparent up to 15 °C (Q10 = 2.5) with emissions being similar between 15 and 18 °C. Conversely, CH4 emissions from the forest soil did not respond to warming. Nitrate availability in the peat decreased by 90% between 2 and 18 °C (P < 0.01), whereas concentrations in the forest soil did not respond. Sulphate availability in the peat decreased significantly with warming (60%, P < 0.01), while the forest soil showed the opposite response (a 30% increase, P < 0.01). Conventionally, thermal responses are studied by incubating individual soil samples at different temperatures, involving lengthy preparation and facilities to incubate samples at different temperatures simultaneously. Data collected on a given thermal response is usually limited and thus interpolated or extrapolated. The thermal gradient method overcomes these problems, is simple and flexible, and can be adapted for a wide range of sample types (not confined to soil). Such apparatus may prove useful in the optimization of management practices to mitigate the effects of climate change, as thermal responses will differ depending on land use and soil type. 相似文献
75.
D R Cordy 《Veterinary pathology》1986,23(1):78-80
76.
In a retrospective study of 182 cases of canine dystocia, no relationship was found between either breed or age and occurrence of dystocia. However, medium-sized breeds (between 12.7 and 20.5 kg bodyweight) were slightly over represented. Of the bitches that had whelped previously, 42 per cent had experienced dystocia. The dystocia was of maternal origin in 75.3 per cent of the cases, mainly due to uterine inertia, while 24.7 per cent were of fetal origin, mainly resulting from malpresentations/malorientations. The most common reason for dystocia was primary, complete uterine inertia (48.9 per cent) and 40 per cent of the bitches with this problem had small litters of one or two pups. The most common treatment was calcium and, or, oxytocin injection followed by a caesarean section. Digital manipulation including forceps delivery and, or, medical treatment was successful in only 27.6 per cent of the cases. Of the bitches studied, 65.7 per cent had a caesarean section. Pup deaths occurred in 52.2 per cent of the litters. Among bitches that had been treated within one to four-and-a-half hours after the beginning of second stage labour, 5.8 per cent of the pups died, whereas the corresponding value for bitches that had been treated between five and 24 hours after the beginning of second stage labour was 13.7 per cent. The total frequency of pup deaths was 22.3 per cent. These findings show that early diagnosis and prompt treatment are crucial in reducing the pup death rate in cases of dystocia. 相似文献
77.
Abstract— Cell mediated and humoral immune responses to experimental Trichophyton verrucosum infection were assessed by sequential cutaneous biopsies, antibody assessments and microscopic monitoring of fungal presence. Histopathologic examination showed the accrual of lymphocytes and other inflammatory cells in the dermis of infected sites. Immunoperoxidase staining of frozen sections with monoclonal antibody preparations revealed an influx of macrophages, BoCD4+ and B0CD8+ lymphocytes and γδ T cells from the 5th day to the 33rd day of infection. A moderate influx of B cells was observed. Protein G-colloidal gold staining revealed the presence of immunoglobulins in the dermis and superficial epidermal layers. Trichophyton specific serum antibodies appeared between days 33 and 55. Microscopic assessment of infected tissues revealed an increase in T, verrucosum elements (mycelium and ectothrix spores) from days 19 to 55. Fungal elements in infected areas did not decrease until after both humoral and cell mediated elements of the immune response were established. These responses imply a combination of cell mediated and humoral events were associated with T. verrucosum immunity and clearance in the calf. Résumé— Le réponse immunitaire humorale et cellulaire a une infection expérimentale àT. verrucosum a été appréciée par des biospsies cutanées successives, des dosages d'anticorps et la recherche microscopique de champignons. L'examen histopathologique a montré un afflux de lymphocytes et d'autres cellules inflammatoires dane le derme des sites infectés. Les marquages en immunopéroxydase par un anticorps monoclonal de coupes congelées a montré un influx de macrophages, lymphocytes BoCD4+ et BoCD8+ et des cellules T γδ, du 5e au 33e jour de l'infection. Un marquage par une protéine G—or colloidal a révélé d'immunogolglobulines dans le derme et les couches supéerficielles de l'épiderme. Les anticorps spécifiques de Trichophyton sont apparus entre 33 et 55 jours. L'examen microscopique des tissus infectés a révélé une augmentation du nombre d'éléments de T. verrucosum (mycelium et spores ectothrix) du 19e au 55e jours. Les éléments fongiques dans les zones infectées n'ont pas diminué avant que les réponses humorales et cellulaires ne solent établies. Ces résponses impliquent qu'une coopération des réponses humorales et cellulaires étaient associées dans l'immunité et la défense contre T. verrucosum. Zusammenfassung— Die zellvermittelten und humoralen Immunantworten auf die experimentelle Infektion mit T. verrucosum wurden durch eine Serie von Hautbiopsien, Antikörperuntersuchungen und mikroskopischer Untersuchung auf das Vorhandensein von Pilzen ausgewertet. Die histopathologische Untersuchung zeigte eine Ansammlung von Lymphozyten und anderen Entzündungszellen in der Dermis der infizierten Stellen. Die Immunperoxidasefärbung der Gefrierschnitte mit monoklonalen Antikörperzubereitungen zeigte einen Influx von Makrophagen, BoCd4-und BoCD8-Lymphozyten und gamma-delta-T-Zellen vom 5. bis zum 33. Tag der Infektion. Es wurde auch ein mäßiger Influx von B-Zellen beobachtet. Die Protein-G-kolloidale Goldfärbung zeigte die Anwesenheit von Immunglobulinen in der Dermis und den oberflächlichen epidermalen Schichten. Trichophyton-spezifische Serumantikörper traten zwischen Tag 33 und 55 auf. Die mikroskopische Untersuchung infizierter Gewebe zeigte eine Zunahme von T. verrucosum-Bestandteilen (Myzel und exktothrixe Sporen) vom Tag 19 bis 55. Pilzteile in infizierten Bereichen verminderten sich weder, nachdem humorale, noch nachdem zellvermittelte Elemente der Immunantwort auftraten. Diese Reaktionen deuten an, daß eine Kombination von zellvermittelten und humoralen Vorgängen im Zusammenhang mit T. verrucosum-Immumtät und Abheilung beim Kalb vorliegt. Resumen Por medio de biposias cutáneas secuenciales, medida de anticuerpos y exámen microscópico de presencia de hongos, se estudió la respuesta inmunitaria de tipo humoral y celular producida por la infección experimental con T. verrucosum. El exámen histopatológico reveló la presencia de agregación de linfocitos y otras células inflamatorias procedentes de la dermis de los puntos infectados. La tintura por medio de inmunoperoxidasa de las secciones congeladas, con preparaciones monoclonales de anticuerpos, demostró un aflujo de macrófagos BoCD4 + y BoCD8 + linfocitos y linfocitos, Tαδ, desde el quinto hasta el día 33 la infección. También se observó un aflugo moderado de linfocitos B. La tintura aúrica de proteina coloidal G reveló la presencia de inmunoglobulinas en al dermis y capas superficiales de la epidermis. Los anticuerpos específicos para la especie Trichophyton aparecieron entre los días 33 y 55. El exámen microscópico de los tejidos afectados demostró un incremento, de los elementos füngicos T. verrucosum (micelio y esporas exótricas) desde los días 19 al 55. Los elementos fúngicos en áreas infectadas no disminuyeron hasta después del establecimiento de ambos tipos de respuesta inmunitaria, humoral y celular. Estas respuestas implican que la combinación de ciertos fenómenos de inmunidad celular y humoral, están relacionados con la desaparición y la inmunidad de la infección producia por T. verrucosum en el ternero. 相似文献
78.
Two mungbean varieties, Guj-1 and PIMS-1 differing in their productivity potential, were examined to investigate their photosynthetic system at various stages of growth in relation to yield with two different dates of sowing. Vertical leaves were found to be beneficial. On the other hand, excessive leaf area during the later stages of growth may be detrimental to yield. Lower LAD at seedling stage and overall high NAR values may be reflected in higher grain yield. NAR declined as season progressed and this, in turn, may be related with increase in LAI. The grain yield was considerably more at the first date of sowing as compared to second date of sowing, the effect was being more pronounced in var. PIMS-1 . Various environmental factors recorded at two different dates of sowing and at various stages of growth indicated that these factors may have influenced the yield potential at two different dates of sowing. 相似文献
79.
Response time of broiler chickens to cimaterol: meat tenderness, muscle composition fiber size, and carcass characteristics. 总被引:4,自引:0,他引:4
The response time to cimaterol (CIM), a beta-adrenergic agonist, by broiler chickens for carcass characteristics, muscle composition, muscle fiber size, catheptic enzyme activity, and tenderness was determined. Two trials were conducted in which chickens were fed a control diet (CON) containing 0 ppm of CIM or a diet containing 1 ppm of CIM. Trial 1 consisted of 55, 31-d-old broiler chickens individually fed for up to 48 h. At 0, 6, 12, 18, 24, and 48 h, five CON and five CIM-fed chickens were killed. Trial 2 consisted of 160, 33-d-old broiler chickens group-fed for up to 14 d. At 2, 4, 6, 8, 10, 12, and 14 d, 10 CON and 10 CIM-fed chickens were killed. The breast muscle (BM) and leg muscle (LM) weight, cathepsin B and L activities, DNA, RNA, and protein concentration, and BM shear force value (SFV) were measured in both trials. Thigh muscle (TM) SFV were measured in Trial 2 only. Fiber size of BM was measured (five birds per treatment) at d 2, 6, 10, and 14. In Trial 1, BM weight and SFV were lower in CIM-fed birds at 6 h (P less than .05). In Trial 2 BM SFV were higher at d 8 (P = .06) and d 10 (P less than .05) in CIM-fed chickens. The SFV of CIM-fed chickens were higher at d 4, 8, 10, 12, and 14 (P less than .05).(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
80.
In an experiment of 36 days duration 46 one-day-old chicks were divided into 5 groups and fed with different concentrations of vitamin D3. The animals of the group which lacked vitamin D3, showed the typical rachitic lesions. After a 15 days lack of vitamin D3 the chicks of another group were treated with standard food (2000 I.U. vitamin D3/kg food) with the consequence of an approximation of the analyzed parameters to those of the control group within 3 weeks. When fed with 60,000 I.U. of vitamin D3 after a 15 days lack of this vitamin, the animals showed an over-hasty healing process, ending up with signs of intoxication which were even more conspicuous when fed with 120,000 I.U. of vitamin D3. Besides an increasing calcification of osteoblasts and endothelial cell membranes as well as a degeneration of osteoblasts, a clear increase of eosinophilic granulocytes could be noticed. In all groups free erythrocytes within the ground substance were found. There was no evidence of necroses of osteocytes or of bone. 相似文献