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正2016年4月,在西藏雅鲁藏布江中游干流下段的派镇段(29°31′9″N,94°52′12″E,海拔2 897 m),6月在米林段(29°12′1″N,94°5′16″E,海拔2 947 m),2017年7月在里龙段(29°8′32″N,93°54′34″E,海拔2 960 m),使用定置刺网共捕获到15尾疑似黄斑褶(Pseudecheneis sulcatus)的鱼类标本(图1a,b)。2017年4月在雅鲁藏布江下游墨脱段(29°18′10″N,95°16′52″E,海拔682 m)采集到一批黄斑褶标本(图1c,d),并与中游的黄斑褶进行了形态学比较鉴定。 相似文献
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正2012年9月8日上午,在西藏东南部林芝市林芝县色季拉山东坡(29°39′03.39″N,94°42′52.47″E,海拔3 894 m)的急尖长苞冷杉(Abies georgei var.)林中的西南花楸(Sorbus rehderiana)上,发现并拍摄到1只鸫。该鸟体长约25 cm,上体褐色,下体皮黄而具明显黑点,耳羽后侧具月牙状黑色斑块,2条白色的点状翼斑明显(图1)。 相似文献
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2012年9月8日上午,在西藏东南部林芝市林芝县色季拉山东坡(29°39′03.39″N,94°42′52.47″E,海拔3 894 m)的急尖长苞冷杉(Abies georgei var.)林中的西南花楸(Sorbus rehderiana)上,发现并拍摄到1只鸫。该鸟体长约25 cm,上体褐色,下体皮黄而具明显黑点,耳羽后侧具月牙状黑色斑块,2条白色的点状翼斑明显(图1)。 相似文献
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正2017和2018年春季在湖北省通城县多次通过鸣声记录到丽星鹩鹛(Elachura formosa),具体记录时间、地点分别为2017年4月26日和2018年4月26日傍晚在通城药姑山白云山庄附近(29°22′52.32″N,113°41′11.76″E,海拔700 m)、2018年4月28日上午10时多在四庄乡大溪村陈寿昌烈士陵园附近(29°22′2.64″N,113°59′36.24″E, 相似文献
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报道了青藏高原通泉草科(Mazaceae)肉果草属(Lancea)粗毛肉果草(Lancea hirsuta Bonati)新分布。该种分布于西藏八宿县(30°12′3.8″N,97°16′48″E)、西藏林周县(30°4′58.8″N,91°16′48″E)、西藏当雄县(30°32′24″N,91°20′24″E)和青海杂多县(33°4′48″N,95°9′36″E),该次发现将中国该种自然分布区扩大到西藏、青海等地,海拔分布也增加至4 300m。凭证标本现存于中国科学院青藏高原生物标本馆(HNWP)。 相似文献
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In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980. 相似文献
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Birefringence of flow of preparations of myosin 总被引:4,自引:0,他引:4
BINKLEY F 《The Journal of biological chemistry》1948,175(1):385-390
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A sensitive method for the detection of small quantities of hydrophobic antioxidant free radical scavengers such as butylatedhydroxytoluene (BHT) and butylatedhydroxyanisole (BHA) in aqueous samples is described. The procedure involves extraction of the hydrophobic free radical scavenger into an organic solvent phase, followed by the subsequent reaction of an aliquot of this extract with the stable cation radical tris(p-bromophenyl)amminium hexachloroantimonate (TBACA). In experiments with BHT and BHA, the loss of TBACA absorbance at 730 nm was found to be linearly proportional to the amount of antioxidant added, with quantities of BHT as small as 200 pmol being easily detectable. In aqueous suspensions of dimyristoylphosphatidylcholine vesicles, assays of the aqueous BHT concentration showed that BHT partitioned strongly into the membrane phase, achieving very high BHT/phospholipid ratios. For a given concentration of BHT, partitioning into the membrane phase was greater in large, multilamellar liposomes than in either small, single-walled vesicles or in purified rat brain synaptic vesicle membranes. Direct assay of BHT and BHA in phospholipid membranes, however, was complicated by a nonspecific interaction between TBACA and the phospholipid. 相似文献