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使用陷阱采样在蜘蛛生态学研究中的应用   总被引:10,自引:0,他引:10  
喻国辉  陈建 《蛛形学报》2001,10(1):52-56
介绍1种国外常用的研究地面活动蛛知生态学的采样的方法,即陷阱采样。对如何制作和排布陷阱做了比较详细的说明,并对使用陷阱研究的生境以及通过陷阱所获得的类群做了介绍,同时,通过举例对如何使用陷阱及由陷阱得到的数据的数学处理作了说明。  相似文献   

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ULTRAVIOLET PATTERNS IN THE TRAPS OF CARNIVOROUS PLANTS   总被引:2,自引:1,他引:2  
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SDP型猕猴桃保鲜剂研制及其应用研究   总被引:1,自引:0,他引:1  
本文介绍,以菜油磷脂和其它天然产物为原料,研制出SDP型猕猴桃保鲜剂,应用于“海沃特”果实的保鲜贮藏。在产地简易通风库中,常温贮藏3~5月,好果率>70%,比对照多出好果8~18%,Vc含量高于对照9~37.3%,果实外观、口感、风味均正常,此外,初步探讨了保鲜机理,提出了天然营养性防腐保鲜的新概念。  相似文献   

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Part I of this report deals with the topical use of cortisone in a variety of skin diseases. Fifteen patients with chronic discoid lupus erythematosus, four patients with necrobiosis lipoidica diabeticorum, four with psoriasis, one with lichen planus and one with granuloma annulare were treated with cortisone ointment. All the patients with chronic discoid lupus erythematosus had some degree of improvement. In two patients with chronic lupus erythematosus, complete clearing of the eruption occurred. In four patients with necrobiosis lipoidica diabeticorum remarkable involution resulted. Patients with psoriasis, lichen planus and granuloma annulare were not benefited.Part II deals with the systemic use of cortisone. Eight patients with severe serum sickness-like penicillin reaction responded dramatically to parenterally administered cortisone. In two cases of pemphigus vulgaris and one case of Sulzberger-Garbe disease, the disease was kept in remission with cortisone administered intramuscularly as well as orally. Partial improvement resulted in a case of localized myxedema associated with malignant exophthalmus. Two patients with exfoliative dermatitis due to therapy with heavy metals responded dramatically to cortisone. No beneficial effects were noted in patients with chronic urticaria and atopic dermatitis.The systemic use of ACTH and cortisone in dermatology at present should be confined to patients with known fatal or hopelessly incapacitating diseases and to patients with extreme hypersensitivity reactions which may be protracted or life-endangering, and which can be controlled or cured with a relatively small total dosage of the agents in a short time.  相似文献   

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Brief formalin fixation in the cold prior to histochemical assay of rat liver and pancreas for various dehydrogenases has been used successfully to circumvent the structural damage and enzymatic loss to which mitochondria of frozen sections would otherwise be subject. To obtain an optimal result a single set of conditions has been devised, including fixation prior to freezing of minute (finely diced) organ blocks in graded concentrations (0.7 to 2.0 per cent) of formaldehyde in chilled (1–4°C) Hanks'' balanced salt solution, freezing at not higher than -70°C, and use of nitro-BT or, preferably, tetranitro-BT. The present histochemical study of hepatic and acinar cells indicates that not only are succinic and D-β-hydroxybutyric dehydrogenases located exclusively in the mitochondria but so are lactic, malic, and the isocitric dehydrogenases.  相似文献   

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Three hundred patients with subacute or chronic non-tuberculous bronchopulmonary disease were given aerosol therapy, chiefly penicillin and more recently penicillin combined with streptomycin. The result showed that the inhalation of these antibiotics is a useful procedure in the treatment of tracheobronchitis, either subacute or protracted, or in association with bronchial asthma, bronchiectasis or pulmonary emphysema. The method of administration is simple.  相似文献   

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低温显微装置及其对细胞胞内冰晶形成现象的观察   总被引:6,自引:0,他引:6  
了解细胞在不同条件下的结冰可能性有助于设计低温保存方案。应用低温显微系统.本对快速冷冻的脐带血干细胞的结冰现象进行了研究。在没有低温保护剂时,胞内出现冰晶温度范围为-4℃— -13℃,在有10%二甲亚砜做低温保护剂时,胞内出现冰晶温度范围为-27℃— -38℃。利用得到的实验数据,根据Toner提出的胞内冰晶形成模型,对有关参数进行了拟合。  相似文献   

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Different traps were compared to find the type most suitable for studying aphid vectors of plant viruses quantitatively.
A Moericke water trap caught more aphids than a flat sticky trap of equal area. A flat sticky trap (930 sq. cm.) caught half as many aphids as a cylindrical trap (945 sq. cm.), which caught about one-third as many as a water trap (1200 sq. cm.) or a Johnson suction trap (9 in. fan) when operated at between 2 and 3 ft. over bare soil.
Yellow traps caught proportionally more Tuberculoides annulatus , and in summer more Capitophorus species than a suction trap, but significantly fewer Anoecia corni, Sitobium spp. and Pemphigus bursarius. Traps with a level surface caught proportionally more Brevicoryne brassicae, Aphis fabae and Myzus persicae , but fewer Anoecia corni and Drepanosiphum plantanoides than vertical cylindical traps. Attraction by colour influences the catch on horizontal traps more than on cylindrical traps because there is less impaction by the wind.
Only suction traps indicate the number of aphids per unit volume of air and are non-selective, but they are expensive and require an electric power supply. Water traps effectively catch those aphids that are attracted to yellow, but they require frequent attention. Sticky traps catch fewer aphids than either suction or water traps, but they can be left unattended for about 2 weeks. Flat sticky traps catch aphids likely to land on a crop, and cylindrical traps show when aphids are in the air, but not if those aphids are able or wanting to land. For routine work cylindrical sticky traps have other advantages; they are cheap and do not require skilled handling, and their catches of alate Myzus persicae have been correlated with the spread of some plant viruses.  相似文献   

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A variety of furan-modified nucleoside phosphoramidite monomers has been prepared and efficiently incorporated into oligonucleotides. These take part in Diels-Alder reactions with fluorescent maleimides to give fluorescent-labeled oligonucleotides. This represents a strategy for oligonucleotide labeling that is orthogonal to amine-based methods.  相似文献   

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