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排序方式: 共有137条查询结果,搜索用时 15 毫秒
61.
Hiromichi Mitamura Nobuaki Arai Yukiko Yamagishi Yuuki Kawabata Yasushi Mitsunaga Metha Khachaphichat Thavee Viputhanumas 《Fisheries Science》2009,75(1):175-182
The horizontal and vertical movements of eight immature hatchery-reared (F2) Mekong giant catfish Pangasianodon gigas were monitored using acoustic telemetry in the Mae Peum reservoir, Thailand, from September to December 2005. All tagged
fish were successfully monitored throughout the study period. All fish moved throughout the reservoir for approximately 1 month
after release. Subsequently, their utilized areas became small, and the fish utilized deep areas of the reservoir. The fish
displayed diel spatial movement patterns between deep areas in the day and shallow areas in the night. The vertical movements
of the fish were related to the environment declination such as existence of hypoxic water and thermocline. Our results suggest
that the establishment of a protected area in addition to conventional fisheries regulations may sustain the fish population
in this reservoir. 相似文献
62.
Gu-Joong Kwon Shigenori Kuga Keko Hori Mitsuyoshi Yatagai Keisuke Ando Nobuaki Hattori 《Journal of Wood Science》2006,52(5):461-465
Pyrolysis of cellulose was studied for the purpose of practical production of 1,6-anhydro-β-D-glucopyranoside (levoglucosan, LG). To minimize secondary degradation of levoglucosan, two methods were examined: (1) conductive
heating by glass bottle, and (2) radiation heating from the surface by CO2 laser beam, both under vacuum and in a nitrogen atmosphere. Glass-bottle pyrolysis under vacuum gave levoglucosan yield of
50%–55% in the optimum temperature range of 350°–410°C, where placing the cold trap in the vicinity of heated area was effective
in improving the yield. In contrast, glass-bottle pyrolysis under nitrogen gave low yields of 17%–20%, probably due to slower
diffusion of pyrolysis product from hot region. The CO2 laser pyrolysis under vacuum gave the product as aerosol (white smoke), causing difficulty in recovery of the product, and
the maximum yield was 5%–17%. In this case the treatment under nitrogen flow was effective for recovery of aerosol, and the
maximum yield reached approximately 25%. 相似文献
63.
64.
Yohko SUZUKI Kazuyuki SUZUKI Toshio SHIMAMORI Masakazu TSUCHIYA Andrew NIEHAUS Jeffrey LAKRITZ 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2016,78(1):49-53
The aim of the present study was to compare endotoxin activities detected in raw milk
samples obtained from cattle by a commercially available portable test system (PTS) and
traditional microplate limulus amebocyte lysate (LAL)-based assay, which determined
activities using a kinetic turbidimetric (KT) assay. Raw milk samples were obtained from
53 and 12 dairy cattle without and with clinical mastitis, respectively. Comparison
between the KT and PTS was performed by the Friedman test. The Pearson product moment
correlation coefficients were calculated to evaluate associations between any two
continuous variables. Linear regression model analysis was also performed to obtain the
equation describing the relationship between PTS and KT assay. The endotoxin activities
detected in 200- or 400-fold diluted milk samples were similar between PTS and KT assay,
whereas a significant difference was observed in 100-fold diluted milk
(P<0.001). The results obtained from 200-
(r2=0.778, P<0.001) and 400-fold diluted
milk samples (r2=0.945, P<0.001) using PTS
correlated with those using KT assay. The median milk endotoxin activities in
Gram-positive and Gram-negative clinical mastitis cows were 0.655 and 11,523.5
EU/ml, respectively. The results of the present study suggest that PTS
as a simple and easy test to assess endotoxin activity in raw milk is efficient, simple
and reproducible. 相似文献
65.
Shoji?HashimotoEmail author Nobuaki?Tanaka Masakazu?Suzuki Ayako?Inoue Hideki?Takizawa Izumi?Kosaka Katsunori?Tanaka Chatchai?Tantasirin Nipon?Tangtham 《Journal of Forest Research》2004,9(1):75-79
Soil respiration and soil carbon dioxide (CO2) concentration were investigated in a tropical monsoon forest in northern Thailand, from 1998 to 2000. Soil respiration was relatively high during the rainy season and low during the dry season, although interannual fluctuations were large. Soil moisture was widely different between the dry and wet seasons, while soil temperature changed little throughout the year. As a result, the rate of soil respiration is determined predominantly by soil moisture, not by soil temperature. The roughly estimated annual soil respiration rate was 2560gCm–2year–1. The soil CO2 concentration also increased in the rainy season and decreased in the dry season, and showed clearer seasonality than soil respiration did. 相似文献
66.
Yuichi?YamaokaEmail author Hayato?Masuya Nobuaki?Ohtaka Hideaki?Goto Shigeru?Kaneko Yoshio?Kuroda 《Journal of Forest Research》2004,9(1):67-74
Ophiostoma species were isolated from bark beetles and Abies mariesii, A. veitchii and A. homolepis attacked by the beetles in Nikko, Tochigi, central Honshu, Japan. One to two Ophiostoma species were frequently isolated from each species of bark beetle. Ophiostoma subalpinum was the most common associate of Cryphalus montanus. Ophiostoma sp. B as well as O. subalpinum was a common fungus associated with Polygraphus proximus. Ophiostoma europhioides was isolated from Dryocoetes hectographus and D. autographus as one of the common associates. Ophiostoma sp. J and Ophiostoma sp. S were frequently isolated from D. autographus and D. striatus, respectively. These fungi seem to have specific relationships with particular bark beetles. Ophiostoma sp. B, Ophiostoma sp. J and Ophiostoma sp. S have unique morphological characteristics and appear to be new species. Five trees of A. veitchii, approximately 43 years old, were inoculated with five Ophiostoma species to assess the relative virulence of the fungi. Ophiostoma subalpinum, Ophiostoma sp. B, and O. europhioides had relatively higher virulence than the other species studied. 相似文献
67.
Solar and lunar influences on the spawning activity of Pacific bluefin tuna (Thunnus orientalis) in the south‐western North Pacific spawning ground 下载免费PDF全文
Tamaki Shimose Yoshimasa Aonuma Toshiyuki Tanabe Nobuaki Suzuki Minoru Kanaiwa 《Fisheries Oceanography》2018,27(1):76-84
Pacific bluefin tuna (Thunnus orientalis) migrate to the south‐western North Pacific spawning grounds (area off Taiwan and the Ryukyu Islands) from mid‐April to early July. Reproductive traits of the species in this area have been studied for some time; however, temporal changes in spawning activity during this season are not well understood. In this study, the spawning fraction (proportion of females with post‐ovulatory follicles to total mature females) in relation to solar calendar date and lunar day was investigated using a generalized linear model. Sampling was conducted almost every day throughout the fishing season at Ishigaki Fishing Port (24°21′N, 124°09′E), southern Japan between 2012 and 2014, and a total of 212 ovaries were histologically observed. Spawning fraction continued to increase from the beginning to the end of the season. This indicates that the peak season of occurrence in the area and the peak of spawning activity did not co‐occur. Spawning fraction also changed with the lunar day and significantly increased around the new moon. Eggs and early larvae hatched around the new moon may have reduced the predation risk during night‐time. These findings improve the current knowledge of reproductive biology and resource evaluation of Pacific bluefin tuna and indicate that spawning activity is not constant, and has two or three peaks in each season. 相似文献
68.
Evaluation of maturity of poultry manure compost by phospholipid fatty acids analysis 总被引:1,自引:0,他引:1
Kotaro Kato Nobuaki Miura Hiroyasu Tabuchi Ichio Nioh 《Biology and Fertility of Soils》2005,41(6):399-410
To study the influence of the physical properties of compost feedstock on some characteristics associated with maturity, two types of compost were made from poultry manure, rice husk, and rice bran. The bulk density of one type (PMC) was always higher than that of another type (NMC) during composting. In the case of PMC, the change in temperature, decrease in NH4+, appearance of NO3–, and increase in germination indices (GI) with Japanese Komatsuna (Brassica campestris cv. Osome) were all more delayed than in NMC. As the composting process progressed, the proportion of branched (iso-, anteiso-, 10Me-) and saturated phospholipid fatty acids (PLFA) [BRANCHED FAMES (fatty acid methyl esters), biomarkers for gram-positive bacteria] gradually increased, then reached plateau. The high proportion of BRANCHED FAMES was maintained over a long storage period. The straight hydroxyl and saturated PLFAs (SOH-FAMES) initially increased, then disappeared with the progress of composting. The increase in BRANCHED FAMES and the decrease in SOH-FAMES were more delayed in PMC than NMC. The day on which the proportion of BRANCHED FAMES reached plateau and the proportion of SOH-FAMES dipped below 2 mol% coincided with the maturity stage based on the changes of physicochemical characteristics and GI. The composition of BRANCHED FAMES showed highly positive and negative correlation with GI and NH4+, respectively. In the case of SOH-FAMES, inverse correlations were observed. This indicates that the proportion of BRANCHED FAMES and/or SOH-FAMES can be used as a tool for evaluating the maturity of poultry manure compost. 相似文献
69.
Tetsuya Adzuhata Tomoko Okamura Junko Inotsume Ryoei Kikuchi Toru Ozeki Masahiro Kajikawa Nobuaki Ogawa 《Water, air, and soil pollution》2001,130(1-4):337-342
Fog/cloud and rain water were collected at the mountainside of Hachimantai range in northern Japan and rain water was also collected at Akita City in order to investigate the air pollutant scavenging mechanism. The concentrations of various ions in these samples were analyzed, and the fog drop size and the wind direction were measured at each fog event. The fog at Hachimantai range had a very high total ion concentration, and was considerably acidified by non sea salt (nss-) SO4 2? and NO3 ?, compared with the rain at Akita and all sites in Hachimantai range. Using the oblique rotational factor analysis, three factors were extracted as the air pollutants; A: (NH4)2SO4+H2SO4, B: sea salts+HNO3+H2SO4, C: NH4NO3+OH?. These salts are well-known as the cloud condensation nuclei (CCN). Combining the factor analysis with the 72h back trajectory at 850hPa level, the contribution of Factor A was closely connected to the long-range transportation of anthropogenic or natural aerosol in air masses of continental origin. 相似文献
70.
Takashi OKU Kotaro SATO Masaki KURAO Shohei MATSUURA Yasufumi SAKAI Takao TSUCHIYA 《Journal of General Plant Pathology》2000,66(4):332-334
The pathogenic race of 59 cultures of Xanthomonas oryzae pv. oryzae, a pathogen of bacterial leaf blight of rice, isolated from six locations in the inland mountainous area of Hiroshima Prefecture
in 1999, were determined by a set of traditional differentials. Four races—I, II, V and VII—were found across the area; however,
we noticed the composition of the races as well as the dominant race in each location different. All races were avirulent
on differential cultivar Te-tep. Races V and VII were new to Hiroshima. The rice cultivars infected with bacterial leaf blight
in Hiroshima are thought to be grouped into the Kinmaze group, which does not have any resistance genes. Apparently, a variety
of races occurred unexpectedly on the cultivars contrary to stabilizing selection theory.
Received 25 February 2000/ Accepted in revised form 13 July 2000 相似文献