Author Keywords: Exercise; hyperthermia; fatigue; blood lactate; selective brain cooling 相似文献
收费全文 | 11609篇 |
免费 | 1040篇 |
国内免费 | 312篇 |
2024年 | 24篇 |
2023年 | 238篇 |
2022年 | 212篇 |
2021年 | 466篇 |
2020年 | 468篇 |
2019年 | 624篇 |
2018年 | 434篇 |
2017年 | 401篇 |
2016年 | 370篇 |
2015年 | 421篇 |
2014年 | 653篇 |
2013年 | 860篇 |
2012年 | 473篇 |
2011年 | 490篇 |
2010年 | 413篇 |
2009年 | 421篇 |
2008年 | 466篇 |
2007年 | 430篇 |
2006年 | 397篇 |
2005年 | 318篇 |
2004年 | 346篇 |
2003年 | 300篇 |
2002年 | 307篇 |
2001年 | 253篇 |
2000年 | 181篇 |
1999年 | 199篇 |
1998年 | 201篇 |
1997年 | 181篇 |
1996年 | 142篇 |
1995年 | 161篇 |
1994年 | 181篇 |
1993年 | 125篇 |
1992年 | 179篇 |
1991年 | 148篇 |
1990年 | 149篇 |
1989年 | 150篇 |
1988年 | 163篇 |
1987年 | 122篇 |
1986年 | 97篇 |
1985年 | 132篇 |
1984年 | 153篇 |
1983年 | 109篇 |
1982年 | 105篇 |
1981年 | 99篇 |
1980年 | 66篇 |
1979年 | 41篇 |
1978年 | 17篇 |
1977年 | 19篇 |
1976年 | 14篇 |
1972年 | 11篇 |
1. 1.|Hypothalamic and rectal temperatures were recorded in 8 warm-reared (wr) and 12 control rats. Rats ran to exhaustion at a constant speed of 1.5 km h−1 but at a variable ambient temperature adjusted to stabilize their hypothalamic temperature at 38.0°C (normothermia) or 41.0°C (hyperthermia). Blood lactate concentrations were determined before and after exercise.
2. 2.|Exercise caused exhaustion in normothermic control rats after 62.08 ± 5.43 min and in wr rats after 29.64 ± 2.09 min.
3. 3.|Hyperthermia shortened to one half (to 12.24 ± 1.36 min) and to one fourth (to 16.15 ± 1.20 min) the endurance time in wr and control rats, respectively.
4. 4.|There were no correlations between lactate concentraion and hyperthermia or endurance time.
5. 5.|In conclusion, in rats and other animals which have safe refuges, hyperthermia interferes with the ability to continue exercising.
1. | The actions of GABA on three classes of visual interneurons in crayfish, Procambarus clarkii, medulla externa are examined. The effect of GABA on the visual response is compared to GABA's action on agonist-elicited responses purported to mediate the visual response. |
2. | GABA produces a shunting type of inhibition in medullary amacrine cells which is associated with a small depolarization (Figs. 2, 3), a large increase in input conductance (Gn) and a reversal potential close to rest (Fig. 4). GABA is a potent antagonist to the depolarizing action of acetylcholine (ACh) (Fig. 5). |
3. | GABA depolarizes dimming fibers (Fig. 2), and the response is mediated by an increase in Gn (Fig. 6). GABA antagonizes the light-elicited IPSP and the hyperpolarizing action of ACh (Fig. 7). |
4. | Sustaining fibers (SF) do not appear to have GABA receptors but GABA inhibits the excitatory visual input pathway to the SFs (Fig. 8). Conversely, the GABA antagonist, bicuculline, potentiates the SF light response (Fig. 9). |
5. | GABA has at least three different modes of antagonist action in the medulla: i) Increased conductance and depolarization in dimming fibers and medullary amacrine neurons; ii) Decreased chloride conductance in tangential cells; and iii) An inhibitory action on the visual pathway which drives SFs. |