全文获取类型
收费全文 | 110篇 |
免费 | 0篇 |
专业分类
林业 | 18篇 |
农学 | 1篇 |
10篇 | |
综合类 | 1篇 |
农作物 | 4篇 |
水产渔业 | 6篇 |
畜牧兽医 | 64篇 |
植物保护 | 6篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2018年 | 1篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 3篇 |
2013年 | 7篇 |
2012年 | 10篇 |
2011年 | 6篇 |
2010年 | 7篇 |
2009年 | 4篇 |
2008年 | 3篇 |
2007年 | 5篇 |
2006年 | 2篇 |
2005年 | 4篇 |
2004年 | 4篇 |
2002年 | 2篇 |
2000年 | 4篇 |
1999年 | 6篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 11篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1966年 | 1篇 |
1925年 | 1篇 |
排序方式: 共有110条查询结果,搜索用时 15 毫秒
81.
Hashimoto Y Sadamoto Y Konno A Kon Y Iwanaga T 《The Japanese journal of veterinary research》2004,52(3):113-124
Distribution of ASCT1, a neutral amino acid transporter, in non-neuronal peripheral tissues of adult and developing mice was examined by immunohistochemistry and immunoelectron microscopy. Immunoreactivity for ASCT1 in the digestive system was localized in basal cells of stratified squamous epithelia from oral parietes to nonglandular region of the stomach, chief cells of the glandular stomach, acinar cells of the salivary gland and exocrine pancreas, and Paneth's cells of the small intestine, in all of which the basolateral membrane was selectively immuno-labeled. In the liver of adult mice, ASCT1 immunoreactivity was detected on the plasma membrane of hepatocytes surrounding central veins, and a temporal expansion of immunoreactive hepatocytes was observed in the embryonic and CCl4-treated adult livers. ASCT1 was also localized on the plasma membranes of proximal uriniferous tubule epithelial cells in the kidney of adult mice, and those of supporting cells in the medulla of adrenal gland. These results suggest that ASCT1 is expressed in various non-neuronal peripheral tissues in mice, and it contributes to the amino acid transport throughout non-neuronal tissues. 相似文献
82.
Khlood EB Miyoshi H Iwata H Kazusaka A Kon Y Hadid AH Moustafe EK Ghonim MH Fujita S 《The Japanese journal of veterinary research》1999,47(1-2):13-23
To investigate the effect of the environmental pollutants, polycyclic aromatic hydrocarbons (PAHs), on retinoic acid-induced teratogenesis, all-trans-retinoic acid (RA) dissolved in corn oil (120 mg/kg) was administered orally to pregnant rats at the 11th day of gestation with and without the prior intraperitoneal treatment with 10 mg/kg 3-methylcholanthrene (3-MC) for 3 days. Dams were killed on the 20th day of pregnancy. The examinations of fetuses revealed that 3-MC barely enough to cause induction of P-450 in pregnant dams had profound embryo-toxic effects: the fetal resorption amounted to approximately 60% of total number of implantations. The fetuses survived weighed less than the control fetuses. All of RA-treated mothers had fetuses with abnormalities, and the main malformations were absence of tail (100%), caudal and sacral malformations (100%), and cleft palate (42%). Pregnant dams received both 3-MC and RA had a reduced severity of tail anomaly (33%), while the rest, 67%, had short vestigial tail. Caudal and sacral malformations were detected but at a milder degree. We did not observe cleft palate in this group. The concurrent treatment of dams with 3-MC and RA led to an increased inducibility of cytochrome P-450 and subsequently, CYP1A1 dependent enzyme activity higher than those observed after the injection of 3-MC alone. UDP-glucuronyl-transferase activity was also markedly induced in concurrent 3-MC and RA group higher than that in 3-MC alone. We suggest that the induction of P-450 and alteration of metabolic enzyme activities may play an important role in reducing the teratogenic potency of RA. However, RA-treatment did not retard the embryo-toxic effect of 3-MC but rather potentiated. 相似文献
83.
Expression of Renin in the Rat Liver 总被引:4,自引:0,他引:4
Renin is well-known to be a trigger enzyme in the renin-angiotensin system (RAS). In contrast to the classical RAS, the local RAS has recently been noted in several tissues. The local RAS has a function independent from that of the classical RAS, although its physiological principles are not well known. In the present study, we immunohistochemically demonstrated that hepatocytes in the rat express renin. No renin-immunoreactive cells were detected in rat liver at 0 min after death. At 15 min after death, a small number of renin-positive cells was demonstrated in the lamina hepatica, and they increased with time to the end of observation. Immunoreactivity for renin was scarce throughout the cytoplasm, sometimes condensed to below the cell membrane and around the intracellular granules. Histoplanimetrically, the values from 15 min to 120 min after death were significantly different from that at 0 min after death. Hybridohistochemistry revealed no hybrid signals throughout the liver at either 0 min or 30 min, although renin-immunoreactivity was clearly demonstrated in adjacent sections of liver at 30 min after death. In RT-PCR, the radioactivities in kidney and liver at 0 min after death were not different from those at 30 min after death, respectively. These results suggest the existence of hepatic renin in the rat. 相似文献
84.
Aged female snow crabs Chionoecetes opilio, 9 or so years old after their final molt, were collected sporadically from artificial reefs established off the coast of
Wakasa Bay, Sea of Japan. In order to clarify the degenerative changes that occur in spent ovaries, the ovaries of these crabs
were examined histologically. The ovaries were found to be reduced in both size and volume, with most showing significant
oosorption by follicular epithelial cells. Reserve fund eggs and unspawned eggs were rarely detected, with the exception of
some in atretic follicles. One to dozens of orange to black nodules scattered over the ovary consisted of masses of degenerative
ova in various stages of oolysis. Since nodular formation was recognized in 26% of these aged individuals, it seems very likely
that such crabs are unable to spawn healthy eggs. 相似文献
85.
Kazuhiko Masaka Kenji Yamada Yasuhiro Koyama Hajime Sato Hirokazu Kon Hiroyuki Torita 《Forest Ecology and Management》2010
This study examined the factors that influence the size of a soil seed bank in Robinia pseudoacacia stands. We proposed two hypotheses: the amount of buried seeds of R. pseudoacacia is proportional to stand biomass rather than stand age, and apicultural utilization influences the size of the soil seed bank. R. pseudoacacia generally produces seeds with various degrees of physical dormancy. In addition, this tree is short-lived, and fecundity declines after 30–40 years in relation to tree vigor. However, R. pseudoacacia is intensively used in apiculture as an important honey source, and supply of honeybees by beekeepers could influence seed crops. We investigated 25 plantations in Hokkaido (Central, Hidaka, and Oshima) and in Nagano, Japan, where many naturally regenerated R. pseudoacacia stands occur. We found great variation in the size of the soil seed bank among stands, ranging from 13,757 to 6.4 seeds m−2 per plot. A generalized linear mixed model revealed that both basal area (BARp) and apicultural utilization best explained the size of the soil seed bank. Both the positive effect of BARp and small contribution of stand age to the model implied that the soil seed bank is transitory, and will not persist for very long time. The large contribution of apicultural utilization to the size of the soil seed bank implied pollinator limitation under natural conditions. R. pseudoacacia often has large flower crops, and native pollinators can not keep up with the demand for pollination. Thus, the supply of honeybees by beekeepers should improve the pollination success of R. pseudoacacia. From these results, we conclude that we must consider stand history with respect to apicultural utilization if the land is harvested or a stand declines. 相似文献
86.
Armand W. Koné Ettien F. Edoukou Jean T. Gonnety Aurélie N. A. N’Dri Laurenza F. E. Assémien Pascal K. T. Angui Jér?me E. Tondoh 《Agroforestry Systems》2012,85(2):233-245
This paper attempts to provide a new perception of the weed Chromolaena odorata (Asteraceae) which is considered as a plague in agriculture or as a soil fertility indicator. The study was conducted in the forest-savanna transition zone of C?te d??Ivoire and aimed to compare soil biological activity and plant nutrient availability under three well-represented vegetation features, including C. odorata lands (ChrO), shrub savannas (ShrS), and grass savannas (GraS). Each of these vegetation features included five plot replicates (50?m?×?50?m size) distributed in the landscape. Soil chemical parameters such as pH, organic matter, soluble phosphorus, exchangeable bases, and biological parameters such as abundance and diversity of earthworms, and soil enzymatic activities were investigated. Composite soil samples were collected and analyzed for chemical and microbial parameters while earthworms were sampled using the Tropical Soil Biology and Fertility 25?×?25?×?30?cm soil monolith method. A principal component analysis showed a clear demarcation between C. odorata plots and the savanna ones. Soluble P and exchangeable bases were significantly higher under ChrO than under both savannas. Earthworm density was twice higher under ChrO (433.3?±?90.8?ind?m?2) than under ShrS (173.9?±?61.5?ind?m?2) and GraS (176.0?±?40.6?ind?m?2) and this was accounted for by the abundance of detritivores and polyhumics. Acid and alkaline phosphatase activities under ChrO (2.9?±?0.2 and 2.5?±?0.3???mol pNP?g?1 soil?h?1, respectively) were twice higher than under both savannas. Based on the fact that ChrO and ShrS were located on similar soil types and had the same topographic position, we concluded that the establishment of C. odorata in a savanna land and its subsequent high biomass and quality-litter production were mostly the reasons of the improvement in soil biology and plant nutrient availability. Between-savanna comparison showed that ShrS, with higher CEC and exchangeable bases, was somewhat more fertile than GraS, probably because of a better soil physical status. In view of the agronomic potentials of the shrub C. odorata, it may be taken as a basis for improved fallow in Africa. 相似文献
87.
Hirata T Kon N Sugiyama A Sato M Osawa T 《The Journal of reproduction and development》2011,57(5):613-619
The effect of gonadotropin-releasing hormone analogue (GnRH-A) or follicular aspiration at the onset of progesterone-based timed artificial insemination (TAI) on subsequent follicular growth and synchronization of ovulation was examined in early postpartum Japanese Black cows. A total of 40 (22 in Exp. 1 and 18 in Exp. 2) Japanese Black cows at 20-30 days postpartum were fitted with a progesterone releasing internal device (PRID) for 7 days, injected with a prostaglandin F2α analogue upon removal of the PRID and GnRH-A 48 h later, and inseminated 18 h after GnRH-A injection. In Exp. 1, the animals were divided into three groups (untreated control, GnRH-A injection or follicular aspiration) of different treatments on the first day of PRID insertion (day 0), and the synchronized ovulation rate in the follicular aspiration group (100%; 8/8) tended to be higher (P = 0.077) than that in the control group (42.9%; 3/7). In Exp. 2, follicular growth in the GnRH (n = 9) and follicular aspiration (n = 9) groups was monitored by ultrasonography. Four out of the nine animals in the GnRH group had a corpus luteum on either day 4 or day 7 (OV group), and the other five animals had no induced ovulation (NOV group). The diameter of the ovulatory follicle on day 9 in the OV group (1.44 ± 0.11 cm) tended to be greater (P = 0.078) than that in the NOV group (1.13 ± 0.07 cm). Follicular aspiration at the onset of PRID-based TAI of early postpartum Japanese Black cows, regardless of the resumption of ovarian cyclicity, tended to result in a higher rate of synchronization of ovulation than that of the untreated controls. 相似文献
88.
Brahima Koné Guillaume Lucien Amadji Saidou Aliou Sitapha Diatta Cyriaque Akakpo 《Archives of Agronomy and Soil Science》2013,59(7):763-774
With the objective of improving rice productivity and generating additional knowledge on rice production in Africa, field experiments were conducted for two consecutive seasons of 2005 and 2006 in Southern Benin. Terre de barre soils at the WARDA experimental station and Niaouli, and the plinthic Ferralsols of Cana were investigated. A complete fertilizer (Fc) composed of N, P, K, Ca, Mg and Zn was used to assess NERICA.4 (upland rice) root development and grain yield (GY). Similar observations were made in treatments with a specific nutrient excluded from Fc (Fc–N, Fc–P, Fc–K, Fc–Ca, Fc–Mg and Fc–Zn). A grain yield of up to 1.4 t ha?1 (Fc–N) and higher root densities for Fc and Fc–Mg at 20–60 cm were attained. Maximum reductions in yield and rooting depth were observed for Fc–P (27%, 27%), Fc–K (30%, 14%) and Fc–Zn (32%, 2%). Drought occurrence, a high C/N ratio and soil acidity influence the effects of nutrients on rice. Removal of N from basal fertilizer was recommended to reduce the effect of mid-season drought. It is suggested that the critical level of K in the soils of West Africa be adjusted to 0.40 cmol kg?1 for upland rice. 相似文献
89.
Brahima Kone Oikeh Sylvester Sitapha Diatta Eklou Somado Kotchi Valere Kanwar Lal Sahrawat 《Archives of Agronomy and Soil Science》2013,59(4):421-434
In West Africa, two-thirds of upland rice is grown on acidic phosphorus (P)-deficient soils. Phosphorus is one of the most limiting-nutrients affecting crop productivity. A three-year field experiment was conducted on a Ferralsol in Côte d'Ivoire to study the response of four interspecific rice cultivars and a sativa (control cultivar) to Tilemsi phosphate rock (PR) and soluble triple superphosphate (TSP) fertilizer. PR was applied at 0, 150, 300, and 450 kg ha?1 P once in the first year and residual effects were measured in the following years. TSP (0, 50, 100 and 150 kg ha?1 P) was applied yearly. More significant yield increasing (38%) was observed in the second year. Annual application of 50 kg P ha?1 as TSP or a one-time application of 150 kg P ha?1 as PR was the optimum rate for the production of all cultivars. Higher rates of P from TSP (100 and 150 kg P ha?1) gave 2–3 times greater residual P in soil than the optimum rate, inducing no further response of rice. Two interspecific cultivars were identified as the most acid- and low P-tolerant cultivars for improving rice production in West Africa humid forest zone. 相似文献
90.
Bohdan Konôpka Kyotaro Noguchi Tadashi Sakata Masamichi Takahashi Zuzana Konôpková 《Journal of Forest Research》2007,12(2):143-151
Drought stress was simulated in a 28-year-old Japanese cedar plantation (Kanto Plain, Japan) between April and October 2004
by removing throughfall using rain shelters. Changes in fine-root parameters caused by this drought treatment were examined
by sequential soil coring. Drought effects on fine roots were analyzed separately for particular soil depths (0–5, 5–15, and
15–25 cm) and root diameters (<1 and 1–2 mm). Generally, fine-root biomass and root tip numbers decreased by the drought treatment.
Drought stress was most intense for fine roots in the topsoil and weakest for fine roots in the deepest soil layer. Fine roots
less than 1 mm in diameter were affected more severely than 1- to 2-mm roots. The effect of drought treatment was most remarkable
for the number of white root tips, which decreased to 17% of the control at the soil depth of 0–5 cm. These results suggest
that white root tip is the most suitable indicator of drought stress. Simulated drought reduced production of fine roots less
than 1 mm and 1–2 mm in diameter. Fine-root mortality was stimulated for roots less than 1 mm, but not for 1- to 2-mm roots.
These results suggest that fine roots with larger diameters can survive drought stress at a level simulated in this study,
but processes of fine-root production were inhibited regardless of the diameter classes. The duration of drought stress and
phenology of fine roots should also be considered in diagnosing the effects of drought on fine-root parameters. 相似文献