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31.
Nocturnal/diurnal demand-feeding pattern of yellowtail Seriola quinqueradiata under different keeping conditions 总被引:1,自引:0,他引:1
32.
Mitsuo Nagane Kazunori Yoshimura Shu-Ichi Watanabe Masahiko Nomura 《Journal of circadian rhythms》2009,7(1):10-4
Background
Students suffering from psychosomatic symptoms, including drowsiness and feelings of melancholy, often have basic lifestyle problems. The aim of this study was to investigate whether psychosomatic complaints may be related to circadian dysfunction. 相似文献33.
It is controversial whether the adult primate early visual cortex is sufficiently plastic to cause visual perceptual learning (VPL). The controversy occurs partially because most VPL studies have examined correlations between behavioral and neural activity changes rather than cause-and-effect relationships. With an online-feedback method that uses decoded functional magnetic resonance imaging (fMRI) signals, we induced activity patterns only in early visual cortex corresponding to an orientation without stimulus presentation or participants' awareness of what was to be learned. The induced activation caused VPL specific to the orientation. These results suggest that early visual areas are so plastic that mere inductions of activity patterns are sufficient to cause VPL. This technique can induce plasticity in a highly selective manner, potentially leading to powerful training and rehabilitative protocols. 相似文献
34.
将起源于黄色菌(Flavobacteriumsp.KI72)的6─氨基己酸二聚体水解酶(EⅡ)基因以质粒pTS1209为载体,转入假单孢菌PseudomonasputidaNT1126中,得到具有EⅡ高表达活性转基因株,表明以假单胞菌为宿主进行EⅡ酶分子育种的可行性,并为EⅡ酶尚处于进化中的推论提供了旁证。 相似文献
35.
Dominique Robert Jun Shoji Pascal Sirois Akinori Takasuka Ignacio A. Catalán Arild Folkvord Stuart A. Ludsin Myron A. Peck Su Sponaugle Patricia M. Ayón Richard D. Brodeur Emily Y. Campbell Evan K. D'Alessandro John F. Dower Louis Fortier Alberto G. García Klaus B. Huebert Marc Hufnagl Shin-ichi Ito Mikimasa Joh Francis Juanes Mitsuo Nyuji Yoshioki Oozeki Guido Plaza Motomitsu Takahashi Yosuke Tanaka Naoki Tojo Shingo Watari Naotaka Yasue Pierre Pepin 《Fish and Fisheries》2023,24(5):863-888
Early life survival is critical to successful replenishment of fish populations, and hypotheses developed under the Growth-Survival Paradigm (GSP) have guided investigations of controlling processes. The GSP postulates that recruitment depends on growth and mortality rates during early life stages, as well as their duration, after which the mortality declines substantially. The GSP predicts a shift in the frequency distribution of growth histories with age towards faster growth rates relative to the initial population because slow-growing individuals are subject to high mortality (via starvation and predation). However, mortality data compiled from 387 cases published in 153 studies (1971–2022) showed that the GSP was only supported in 56% of cases. Selection against slow growth occurred in two-thirds of field studies, leaving a non-negligible fraction of cases showing either an absence of or inverse growth-selective survival, suggesting the growth-survival relationship is more complex than currently considered within the GSP framework. Stochastic simulations allowed us to assess the influence of key intrinsic and extrinsic factors on the characteristics of surviving larvae and identify knowledge gaps on the drivers of variability in growth-selective survival. We suggest caution when interpreting patterns of growth selection because changes in variance and autocorrelation of individual growth rates among cohorts can invalidate fundamental GSP assumptions. We argue that breakthroughs in recruitment research require a comprehensive, population-specific characterization of the role of predation and intrinsic factors in driving variability in the distribution and autocorrelation of larval growth rates, and of the life stage corresponding to the endpoint of pre-recruited life. 相似文献
36.
Shota NISHIMURA Toshio WATANABE Atsushi OGINO Kazuhiro SHIMIZU Mitsuo MORITA Yoshikazu SUGIMOTO Akiko TAKASUGA 《Animal Science Journal》2013,84(1):1-7
Two taurine breeds, Japanese Black and Holstein, established from geographically distant origins and selected for different uses, beef and dairy, were extensively genotyped using a genome‐wide single nucleotide polymorphism (SNP) chip with more than 1000 animals of each breed. The genetic structure was examined by principal component analysis, in which the first principal component clearly separated the two breeds and explained more than 15% of the variance. Highly differentiated SNPs were detected throughout the genome, some of which were clustered within small regions on BTA4 (79.2–79.7 Mb, Btau4.0) and BTA26 (22.2–23.6 Mb). A breed assignment test was developed using 18 highly differentiated SNPs to distinguish Japanese Black from F1 (Japanese Black × Holstein) and Holstein. The error rate that an F1 or Holstein animal is misjudged as Japanese Black was expected to be < 0.8%, while the error rate that a Japanese Black animal is misjudged as F1 or Holstein was expected to be < 0.001%. This test provides a reliable and powerful method to detect breed label falsification in retail beef. 相似文献
37.
Makoto Nagai Noboru Hori Michiko Miyamoto Masanobu Sakaguchi Yuji Hayakawa Megumi Kawai Mitsuo Kita Tetsuya Furuya Kei Imai 《Animal Science Journal》2013,84(6):461-465
To improve embryo development in bovine separated blastomeres, we evaluated applicability of co‐culture with intact embryos. The morphological quality of blastocysts derived from separated blastomeres and rate of blastocyst formation were only slightly increased when the cells were co‐cultured with intact embryos, which did not provide significant differences when statistically analyzed. However, the cell count of inner cell mass (ICM), trophectoderm (TE) and total number of cells in Day 8 blastocysts were significantly higher when the cells were co‐cultured with the intact embryos than those with the cells cultured individually (P < 0.05). Transfer of four monozygotic pairs of blastocysts derived from the cells co‐cultured with intact embryos led to three pregnancies even when the blastomeres were produced by in vitro maturation and in vitro fertilization of oocytes collected by ovum pick‐up from elite cows. These results suggest that co‐culturing with intact embryos may enhance development of bovine separated blastomere. 相似文献
38.
We compared the diet of Ommastrephes bartramii paralarvae with morphological changes in their beaks and proboscis (fused tentacles). The paralarvae were collected north
of the Hawaiian Islands during 2001 and 2002 and ranged in mantle length (ML) from 1.1 to 13.2 mm. They fed on crustaceans,
including copepods (copepodite stage) and amphipods. The rostral tips of upper and lower beaks began to protrude anteriorly
at around 3–4 mm ML, and the smallest paralarva with identifiable prey in its digestive tract was 4.2 mm ML, which suggests
that the paralarvae can masticate prey soon after the beaks protrude. The proboscis separated into two tentacles at 9.3–13.2 mm
ML, but the newly formed tentacles were weakly developed even in the largest specimen, suggesting that tentacles do not operate
functionally and that the arms are used to capture prey. 相似文献
39.
Yasuhiro Ueno Satoshi Suyama Masayasu Nakagami Miyako Naya Mitsuo Sakai Yutaka Kurita 《Fisheries Science》2017,83(1):23-33
Drifting gill-nets were for a long time the main research gear for investigating the distribution of Pacific saury Cololabis saira. However, it has proven to be difficult to estimate the absolute abundance of saury using drifting gill-nets due to a lack of knowledge on the survey areas swept by these gill-nets. A mid-water trawl stock abundance estimation has the advantage of being able to estimate the absolute stock abundance before the commercial fishing season begins, whereas the conventional stock abundance estimation based on catch per unit efforts of commercial fisheries must be done after the commercial fishing season has ended. To confirm the practicality of a mid-water trawl to estimate the stock abundance of saury, we conducted a comparative survey in the northwestern Pacific Ocean using both a mid-water trawl and drifting gill-nets. We found that the geographic distribution pattern of catch per unit effort for both the mid-water trawl and driftnets was similar. Using the area-swept method and data on the fishing efficiency of the mid-water trawl obtained in a previous study, we were able to estimate the stock abundance plus confidence limits within the research areas. Our results suggest that the size composition of saury sampled by the mid-water trawl can be considered to approximate the actual size composition of saury. 相似文献
40.
Oceanographic factors affecting interannual recruitment variability of Pacific saury (Cololabis saira) in the central and western North Pacific 下载免费PDF全文
Taro Ichii Haruka Nishikawa Kedarnath Mahapatra Hiroshi Okamura Hiromichi Igarashi Mitsuo Sakai Satoshi Suyama Masayasu Nakagami Miyako Naya Norihisa Usui Yoshihiro Okada 《Fisheries Oceanography》2018,27(5):445-457
Pacific saury (Cololabis saira) has a short life span of 2 years and tends to exhibit marked population fluctuations. To examine the importance of sea surface temperature (SST) and mixed layer depth (MLD) as oceanographic factors for interannual variability of saury recruitment in early life history, we analyzed the relationship between abundance index (survey CPUE (catch per unit of effort)) of age‐1 fish and the oceanographic factors in the spawning and nursery grounds of the previous year when they were born, for the period of 1979–2006, in the central and western North Pacific. Applying the mixture of two linear regression models, the variability in the survey CPUE was positively correlated with previous year's winter SST in the Kuroshio Recirculation region (KR) throughout the survey period except 1994–2002. In contrast, the survey CPUE was positively correlated with the previous year's spring MLD (a proxy of spring chlorophyll a (Chl‐a) concentration) in the Kuroshio‐Oyashio Transition and Kuroshio Extension (TKE) during 1994–2002. This period is characterized by unusually deep spring MLD during 1994–1997 and anomalous climate conditions during 1998–2002. We suggest that saury recruitment variability was generally driven by the winter SST in the KR (winter spawning/nursery ground), or by the spring Chl‐a concentration (a proxy of prey for saury larvae) in the TKE (spring spawning/nursery ground). These oceanographic factors could be potentially useful to predict abundance trends of age‐1 saury in the future if the conditions leading to the switch between SST and MLD as the key input variable are elucidated further. 相似文献