Relationship between vertical distributions of Bray II P content and organic P content in the Ap horizon of paddy rice fields     

Ikuko AKAHANE  Naoko SASAKI  Masami NANZYO  Tadashi TAKAHASHI  Takashi TASHIRO  Osamu SEKIGUCHI  Masahiko SAIGUSA 《Soil Science and Plant Nutrition》2006,52(5):654-661

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治沟骨干工程台阶式泄水建筑物的消能防冲研究     

田嘉宁  李建中  高桥正行 《水土保持通报》2005,25(2):1-4

进行了可用于治沟骨干坝的3种不同坡度的台阶式泄水建筑物的模型试验。结果表明,在跌落水流时,消力池跃前断面单位能量随斜坡变陡和相对坝高Hdam/yc增加而增大,但当Hdam/yc增加到某一值后,逐渐趋于平缓。消力池跃前断面底部压力yp与堰上临界水深yc呈现正比线性相关,yp大小与台阶个数N无关。比较跃前断面压力修正系数λ>1和λ=1时的消能率,当Hdam/yc=10左右时,其消能率相对误差可达7%左右,但当Hdam/yc≥70时,其相对误差则降至1%。试验结果也同时显示出λ与yp/y1同样有着很好的线性关系,其相关系数r=0.99999。  相似文献   

Effect of calcitonin on adrenocorticotropic hormone secretion stimulated by corticotropin‐releasing hormone in the hen anterior pituitary     

Hiroyuki NAKAYAMA  Tetsuya TAKAHASHI  Kaori NAKAGAWA‐MIZUYACHI  Mitsuo KAWASHIMA 《Animal Science Journal》2011,82(3):475-480

The presence of a receptor for calcitonin (CT) and the effect of chicken CT (cCT) on adrenocorticotropic hormone (ACTH) secretion stimulated by rat/human corticotropin‐releasing hormone (rhCRH) in the hen anterior pituitary were studied. The specific [¹²⁵I]cCT binding component was present in the plasma membrane of hen anterior pituitary and this binding component had properties of a receptor which has binding specificity to cCT, reversibility, saturable binding, high affinity and limited capacity. When anterior pituitary cells were incubated in vitro, cCT increased the maximal secretion of chicken ACTH stimulated by rhCRH. These results suggest that CT may act directly on the anterior pituitary via its receptor binding and enhances the ACTH secretion by CRH.  相似文献   

Piebald mutation on a C57BL/6J background     

Sanae FUKUSHIMA  Kimie NIIMI  Eiki TAKAHASHI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(2):161-166

The classic piebald mutation in the endothelin receptor type B (Ednrb) gene was found on rolling Nagoya genetic background (PROD-s/s) mice with white coat spotting. To examine whether genetic background influenced the phenotype in the piebald mutant mice, we generated a congenic strain (B6.PROD-s/s), produced by repeated backcrosses to the C57BL/6J (B6) strain. Although B6.PROD-s/s mice showed white coat spotting, 7% of B6.PROD-s/s mice died between 2 and 5 weeks after birth due to megacolon. The PROD-s/s, s/s and Japanese fancy mouse 1 (JF1) strains, which also have piebald mutations on different genetic backgrounds with B6, showed only pigmentation defects without megacolon. In expression analyses, rectums of B6.PROD-s/s with megacolon mice showed ~5% of the level of Ednrb gene expression versus B6 mice. In histological analyses, aganglionosis was detected in the rectum of megacolon animals. The aganglionic rectum was thought to lead to severe constipation and intestinal blockage, resulting in megacolon. We also observed an abnormal intestinal flora, including a marked increase in Bacteroidaceae and Erysipelotrichaceae and a marked decrease in Lactobacillus and Clostridiales, likely inducing endotoxin production and a failure of the mucosal barrier system, leading ultimately to death. These results indicate that the genetic background plays a key role in the development of enteric ganglion neurons, controlled by the Ednrb gene, and that B6 has modifier gene (s) regarding aganglionosis.  相似文献   

Ability of salt glands in Rhodes grass (Chloris gayana Kunth) to secrete Na⁺ and K⁺     

Hidekazu KOBAYASHI  Yoshikuni MASAOKA  Yoshitaka TAKAHASHI  Yasuyuki IDE  Setsuro SATO 《Soil Science and Plant Nutrition》2007,53(6):764-771

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Development and Evaluation of a Novel In-Clinic Automated Hematology Analyzer,ProCyte Dx,for Canine Erythrocyte Indices,Leukogram, Platelet Counts and Reticulocyte Counts     

Yasuhito FUJINO  Yoichi NAKAMURA  Hideaki MATSUMOTO  Kenjiro FUKUSHIMA  Masashi TAKAHASHI  Koichi OHNO  Hajime TSUJIMOTO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2013,75(11):1519-1524

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Timing of Puberty and Its Relationship with Body Growth and Season in Male Raccoons (Procyon lotor) in Hokkaido     

Minami W. OKUYAMA  Michito SHIMOZURU  Go ABE  Mariko NAKAI  Mariko SASHIKA  Ken-Ichiro SHIMADA  Nobuhiro TAKAHASHI  Daisuke FUKUI  Ryohei NAKAMURA  Toshio TSUBOTA 《The Journal of reproduction and development》2013,59(4):361-367

The raccoon (Procyon lotor), indigenous to North America, has naturalized in Japan as an invasive alien species, having been introduced into the country in the 1970s. In Hokkaido, the northernmost island of Japan, feral raccoons have been increasing in number and spreading throughout the island. The age at the onset of puberty for raccoons is important for estimating individual lifetime reproductive success and population growth. The present study investigated the timing of and potential factors affecting the onset of puberty in male raccoons in Hokkaido. External characteristics and histology of testes were studied in 151 male feral raccoons and in 1 captive juvenile. For the majority of feral yearling raccoons, prepubertal development began in May, and spermatozoa production began in October prior to their second mating season. However, some larger juveniles attained puberty during the juvenile period. The captive juvenile, which was fed throughout the winter, attained puberty only 11 months after birth. These results suggest that if male raccoons can achieve enough body growth before the first mating season, puberty can be attained early. In both juveniles and yearlings, spermatozoa production was only observed after autumn. This timing coincided with the recrudescence of seasonally active spermatogenesis in adult males. Therefore, attaining puberty in male raccoons appears to require both adequate body nutrient development and several environmental factors that control seasonal testicular changes.  相似文献   

Low Incidence of an Altered Endometrial Epidermal Growth Factor (EGF) Profile in Repeat Breeder Holstein Heifers and Differential Effect of Parity on the EGF Profile Between Fertile Holstein (Dairy) and Japanese Black (Beef) Cattle     

Seiji KATAGIRI  Masaharu MORIYOSHI  Yoshiyuki TAKAHASHI 《The Journal of reproduction and development》2013,59(6):575-579

A high incidence (about 70%) of alteration in endometrial epidermal growth factor (EGF) profile, i.e., loss of 2 peaks on days 2–4 and 13–14, has been linked to a reduced fertility in multiparous repeat breeder Holstein cows. However, the EGF profile in Holstein heifers and other breeds (types) of cattle has not been investigated. In study 1, EGF concentrations were determined using endometrial tissues obtained by biopsy on days 3, 7 and 14 from 84 fertile Holstein heifers to obtain a normal range and 53 repeat breeder Holstein heifers to estimate incidence of alterations in the EGF profile. In repeat breeder heifers, EGF concentrations were similar to fertile controls on 3 days and five animals (9.4%) had an altered EGF profile with EGF concentrations below the normal range on days 3 and 14. In study 2, EGF concentrations on day 3 were repeatedly examined from the nulliparous period to the third postpartum period in 28 Holstein (dairy) and 47 Japanese Black (beef) cattle. The effect of parity on EGF concentrations on day 3 was different between Holstein and Japanese Black cattle. In Japanese Black cows, the EGF concentrations were consistently high throughout the study period, while in Holstein cows, the EGF concentrations decreased after the second calving. In conclusion, unlike multiparous repeat breeder Holstein cows, an altered EGF profile may not be a major cause of repeat breeding in Holstein heifers, and the peak EGF concentrations around day 3 may decrease even in fertile populations of multiparous dairy cows, but not in beef cows.  相似文献   

Improvement of application method of liquid fertilizer with irrigation water for uniform topdressing and change in nitrogen concentration of flooded water after application     

Toru TSUCHIDA  Yoshihiko TAKAHASHI  Norikuni OHTAKE  Takuji OHYAMA  Masaru KUBOTA 《Soil Science and Plant Nutrition》2006,52(1):133-133

(pp. 811–816)
The application method of liquid fertilizer with irrigation water was tested in large scale paddy fields using a newly developed fertilizer supplier which can make a supplying rate of liquid fertilizer constant. Uniformity of fertilization, change in the nitrogen concentration of flooded water and absorption of applied nitrogen by paddy rice were examined. High uniformity of fertilization was achieved with this method as compared with a conventional broadcast application of granular fertilizer, or an inflow fertilization of granule-like fertilizer with irrigation water.
When urea was applied as liquid fertilizer, the fertilizer-N disappeared quickly from ponding water under shallow conditions of ponding water depth. In the case of the same depth of ponding water, the rate of reduction was large under conditions of large permeability of water.
The nitrogen utilization rates of urea and ammonium sulfate labeled with ¹⁵N were not related to the depth of ponding water at the time of fertilization. When ammonium sulfate was supplied the nitrogen utilization rate was around 50% regardless of fertilization conditions however, the urea-N utilization rate fell to 40% or less at a permeability of ponding water of 0.8 cm day⁻¹ or less, while it increased to 50% equivalent to ammonium sulfate, at 0.8 cm day⁻¹ or more permeability.  相似文献   

Methane uptake and nitrous oxide emission in Japanese forest soils and their relationship to soil and vegetation types   总被引：1，自引：1，他引：1  

Tomoaki MORISHITA  Tadashi SAKATA  Masamichi TAKAHASHI  Shigehiro ISHIZUKA  Takeo MIZOGUCHI  Yoshiyuki INAGAKI  Kazuhiko TERAZAWA  Satoshi SAWATA  Masanori IGARASHI  Hiroshi YASUDA  Yasuhiro KOYAMA  Yoshihito SUZUKI  Nobuyuki TOYOTA  Masamichi MURO  Masaru KINJO  Hirokazu YAMAMOTO  Daitaro ASHIYA  Yoichi KANAZAWA  Tetsu HASHIMOTO  Hidetaka UMATA 《Soil Science and Plant Nutrition》2007,53(5):678-691

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