共查询到20条相似文献,搜索用时 31 毫秒
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八月十五号贾哥、卢姐、师妹卢静和我一行四人踏上了由北京开往宁夏方向的K43次列车,开始了我研究生生涯的第一次野外考察之旅。由于是第一次出野外,所以我和师妹都比较兴奋,一路上不停的向贾哥和卢姐问这问那。我和师妹都师从于我国著名的古鱼类学家朱敏研究员,主要从事古生代 相似文献
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2001年8月我有幸与省电视台的几位同伴一同前往习水县国家级自然保护区进行了为期一周的考察拍摄。 习水位于贵州省北部边缘,是云贵高原北端向四川盆地南部过渡的斜坡地带。关于习水保护区,只是在五月的一份报纸上得知在那里发现了“华南虎”的脚印与那里的原生常绿阔叶林。这次到习水是否能见到“华南虎”…… 8日下午,我们到达习水县城保护区管理处,刘、李二位处长在接待我们的同时,介绍了保护区内发育在白垩纪紫红色砂岩上的中山峡谷地貌与茂密的亚热带原生常绿阔叶林交织而成的红层地貌森林,这里又是长江上游植被保存完好的一道绿色屏障,生物物种非常丰富,还有辉煌的文物史迹,许多著名摄影家都曾到过此地。 相似文献
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当读到辛弃疾“水龙吟——登建康赏心亭”词中的“楚天千里清秋,水随天去秋无际”时,在湖北长江考察的往事不免浮上心头。虽是40多年前的事,但至今依然深深地印在我的脑海中,无论如何也挥之不去。 相似文献
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四川黑竹沟也曾被称作“恐怖死亡谷”,这样的名字不是没有来由的,在那个神秘的地方,至今仍有众多不解之谜。本文作者参与的探险队两次深入黑竹沟,亲身接触了其中的一些“谜团”:“幽谷奇雾之谜”,让他们见识了高声说话就会下雨的奇怪现象;“纬度与金字塔之谜”是一座酷似埃及古金字塔的天然山峰;“人畜入沟神秘失踪之谜”则是指相似地形地貌形成的自然迷宫……另外,在此次科考探险之前,曾有四支探险队历尽艰辛,但都没能进入黑竹沟的腹地——石门关…… 相似文献
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《Plains anthropologist》2013,58(70):267-278
AbstractThe Scratching Deer site (5 BL 69) is a small, single-component Hog Back Phase campsite inthe upper subalpine forest, western Boulder County, Colorado. The site was occupied 1260 + 95radiocarbon years ago, probably by hunters attracted to the region by stone game-drive systems on a nearby tundra ridgecrest. Although few tools were discarded at the site, analysis ofwaste flakes suggests that large numbers of cutting and scraping tools were resharpened in the occupation area, and that new tools were manufactured, possibly from imported stone that was heat-treated in especially-prepared hearths. Occupation was preceded by an interval of expanded snow cover and accelerated erosion, and was followea by an interval of loess accumulation and redeposition; snowbanks have never again been as persistent on the floor of the Green Lakes valley as they were a few centuries prior to occupation. 相似文献
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Dean J. Kereiakes James L. Naughton Bruce Brundage Nelson B. Schiller 《The Western journal of medicine》1984,140(4):583-593
Since the introduction of insulin, heart disease has become a major impediment to survival in persons with diabetes mellitus. Coronary disease has increased severity and accelerated development in diabetic persons compared with an age- and sex-matched nondiabetic population. A peculiar vulnerability of women to the influence of diabetes with loss of premenopausal coronary disease protection has been found. The symptomatology of coronary events may differ and coronary care data show a higher incidence of sudden death in diabetic patients who have a myocardial infarction than in their non-diabetic counterparts. Insulin may play a role in the myocardial adjustment to an ischemic insult by enhancing glucose intake and suppressing lipolysis and ketogenesis. Carbohydrate intolerance in dogs, rhesus monkeys and humans appears associated with similar histologic and compositional changes in the myocardium. Abnormalities in diastolic ventricular function not attributable to large- or small-vessel coronary disease have been found in the diabetic subjects of each species. Studies in humans who have diabetes have assessed single pressure-volume relationships and more exacting measures of ventricular compliance are needed. Abnormalities of myocardial function in patients with diabetes have been found using echo and radionuclide techniques. Many of these findings need to be correlated with invasive data or confirmed in larger populations. Autonomic dysfunction is common in diabetic persons and may imply an associated poor prognosis. Reflex abnormalities in parasympathetic function are most prevalent and occur before sympathetic dysfunction. 相似文献
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Alfred S. Rogen 《BMJ (Clinical research ed.)》1947,1(4489):87-88
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Sydney M. Laird 《BMJ (Clinical research ed.)》1938,1(4033):884-887
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