药物止血牙垫与普通牙垫的临床对比观察

目的:对比观察本药物止血牙垫与普通牙垫对拔牙术后止血等临床经过的影响。方法:对拔牙术后患者随机选择应用药物止血牙垫或普通牙垫。结果:药物止血牙垫在3分钟,5分钟及10分钟止血率与普通牙垫的止血率均有极显著性差异,P<0.005,药物牙垫10分钟内止血率达100%,普通牙垫在45分钟才达100%止血。结论:本止血牙垫作用明显优于普通牙垫,具有一定临床应用价值。     

天山高山垫状植物

以上这些高山垫状植物多具有一共同的特征——即花大而鲜艳,这是适应其高寒地区昆虫稀少,而诱以传粉的生物学适应.由于这些高山植物的形态结构和生活型的特点,便构成了高山垫状植被特有的生态适应特征.天山高山垫状植被对山地土壤的风化形成和防止在夏季冰雪消融的水土流失,防洪水冲刷和泥石流,山坡滑崩,保护下限森林带,水源涵养等均有着极重要的生态环境保护意义.     

青海可可西里地区垫状植物

首次考察青海可可西里地区,共采集到种子植物约２１０ 种,隶属于３０ 科１０２ 属。其中垫状植物有８ 科１５ 属约４８ 种,分别占该地区全部种子植物科的２６．７％ 、属的１４．７％ 、种的２２．９％ 。该区是青藏高原上垫状植物最发达的地区。垫状植物按其形态结构可以划分为４ 种类型：典型（海绵体）垫状植物;密丛垫状植物;短根茎或根蘖型垫状植物;根颈辐状分枝型垫状植物。垫状植物种群或群落广泛存在于该地区各种植被类型中,并且非常发达,甚至可组成优势群落或群丛,形成大面积垫状植被景观。垫状植物是可可西里地区的先锋植物,它们的存在、繁衍、发达和衰退为其它类型植物迁入生长和漫延积累了细土和有机质,改善了生境     

甲真菌病患者甲微生物群分析

目的研究甲真菌病患者甲微生物群的构成,为进一步阐明甲真菌病的发病机制提供线索。方法本研究共纳入47例甲真菌病患者及7例健康志愿者。取患者病甲的甲屑进行真菌镜检及培养鉴定;提取患者病甲、患者对侧健甲及健康人甲的DNA,对真菌rDNA ITS区及细菌16S rDNA V3-V4区PCR扩增,分析微生物群构成,并进行α多样性、β多样性、Simper分析及Spearman相关性分析。结果甲真菌病患者病甲的微生物群构成与对侧健甲及健康人甲存在差异。患者病甲的真菌菌群的丰富度高于对侧健甲。患者对侧健甲细菌菌群的多样性高于病甲及健康人甲,且患者对侧健甲细菌菌群的构成与患甲和健康人甲均有部分重叠。结论患者对侧健甲的细菌菌群构成具有由健康人甲向患者病甲转变的趋势。且在患者病甲的微生物群中,某些真菌和细菌菌属可能具有相关性。     

高原独行侠——垫状植物

漫步在青藏高原上,千奇百怪的垫状植物自然会吸引你的目光。垫状植物,这个名字听起来就是那种非常奇特并且个头矮小的植物。为什么叫做垫状呢?它们又有哪些奇招妙诀呢?     

棉蝗中垫的研究

<正> 剪下棉蝗Chondracris rosea(De Geer)各胸足前跗节的中垫,用放大镜观察,发现棉蝗的中垫呈圆形、中间凹,测量其直径约为1.5mm。右手拇指把中垫压在左手食指上,松开右手,不管左手怎样变动位置,中垫能吸住食指。当右手扯开中垫时,人感到有吸引力。将中垫按在玻璃上,松开手,变动玻璃位置,中垫不会掉下。剪去活棉蝗各胸足前跗节二爪,留下中垫,放在玻璃上,将     

易与甲真菌病混淆的甲病—非真菌性甲营养不良

甲营养不良是指各种原因造成的指甲形态及结构异常[1]。临床上部分甲营养不良是由于甲真菌感染所致,但大部分导致甲营养不良损害的病因复杂,可以为先天性,也可能为获得性,多与系统性疾病、其他皮肤病或某些药物摄入有关。与此同时,很多甲营养不良损害的患者无自觉症状,仅因为美学问题而就诊。甲营养不良病因复杂,表现多样,诊断困难,治疗效果常常不佳。     

念珠菌性甲真菌病

念珠菌性甲真菌病是由念珠菌引起的一类特殊类型甲真菌病,近年来有逐渐增多的趋势,在有些国家或地区其发病率甚至占主要地位。念珠菌性甲真菌病在发病机理、流行病学、诊断、临床形态及治疗等方面与皮肤癣菌性甲真菌病有诸多差异。     

洞庭湖区苇田拟垫跗蠼螋研究

拟垫跗蠼螋Proreus simulans(Stal)的生物学,包括栖息习性,越冬虫态和越冬场所,卵的历期;各龄若虫的形态特征与历期;成虫的耐饥能力,交配、产卵习性,越冬期成虫呼吸率和呼吸商等内容。捕食作用研究结果表明,该天敌的食蚜日均捕食量随龄次增大,4龄达到最大,至成虫以后保持稳定;各龄若虫及咸虫的功能反应均属H011lngⅡ型;著者最后认为拟垫跗蠼螋是一种有利用价值的捕食性天敌,并提出保护利用措施。     

Dormancy-inducing factors of rubber litter beetle, Luprops tristis (Coleoptera: Tenebrionidae)

Abstract  The effect of photoperiod, temperature, humidity, rainfall and moisture were examined on the annual migration of Luprops tristis (Fabricius, 1801) (Coleoptera: Tenebrionidae) from rubber plantations to shelters, and the induction of 9 months dormancy thereafter. Results confirm the role of rainfall-mediated wetness from summer showers as the cue that induces dormancy in Luprops tristis and provide further proof to the function and significance of moisture in diapause induction in tropical insects. Other factors did not have any significant independent effect on migration and dormancy induction. Reserve food accumulation by teneral adults well ahead of the onset of adverse conditions and the non-return of beetles to the field in short-term favorable conditions strongly indicate that Luprops tristis has evolved the ability to "predict" and avoid adverse conditions and the inheritance of dormancy-regulating factors from the parent generation.     

The early development of the tail and the transformation of the shape of the nucleus of the spermatid of the domestic fowl,Gallus gallus

Summary The differentiation of the spermatid, especially in reference to the formation of the flagellum, and transformation of the shape of the nucleus was investigated in the domestic fowl.In the early stage of the spermatid, a prominent Golgi apparatus appears around the centrioles. The Golgi vesicles then surround the axial-filament complex which develops from the distal centriole. These vesicles fuse to form continuous membrane at the earliest stage of flagellar formation, and in the succeeding stage Golgi lamellae are attached to the plasma membrane of the developing flagellum. From these observations, it is assumed that Golgi apparatus may be a source of the membrane system of the flagellum.The microtubules distributed around the nucleus form the circular manchette. The anterior region of the nucleus with the manchette is cylindrical in shape and the posterior region without it remains irregular in shape. When the circular manchette has been completed, the whole nucleus acquires a slender cylindrical shape. The circular manchette then changes into the longitudinal manchette. The nuclei of spermatids without a longitudinal manchette are abnormal in shape. In view of these observations it is assumed that the nuclear shaping of the spermatid may be accomplished by circular manchette and the maintenance of shape of the elongated nucleus by longitudinal manchette.The authors wish to thank Mr. Takayuki Mori for his helpful suggestions and technical advices     

Characteristics of the membranes of the pellicle of the ciliatePseudomicrothorax dubius

Summary The membranes of the pellicle of the ciliatePseudomicrothorax dubius are investigated using thin section electron microscopy and freeze-fracture replicas. The plasma membrane is covered by a surface coat and is connected to the outer alveolar membrane by short, sometimes branched, bridges. The inner alveolar membrane is coated on both sides. The epiplasm lies in intimate contact with the cytoplasmic surface of this membrane, and there is a corresponding deposit on the other surface. This deposit is regularly striated.The epiplasmic layer and the alveoli are interrupted at sites of cytotic activity,e.g., the attachment sites of trichocysts, the cytoproct, and the parasomal sacs. The striated deposit ends where the epiplasm ends, indicating a direct relationship between these two epimembranous layers.There is a deposit along the sides of the first part of the tip of the trichocysts, and in this region the trichocyst membrane is free of intramembranous particles.The membrane of the parasomal sacs has a coat on both surfaces. That on the extraplasmic surface is similar to the surface coat of the plasma membrane. The origin of the cytoplasmic coat is unknown. The cytotic activity of these sacs is indicated by their highly irregular profiles.     

Observations on the permeability of the choriocapillaris of the eye

Summary The choriocapillaris is a fenestrated capillary bed located posterior to the retinal pigment epithelium. It serves as the main source of supply to the photoreceptors, retinal pigment epithelium, and other cells of the outer retina. The permeability of these capillaries to intravenously injected ferritin (MW — approx. 480,000; mol. diam. 11 nm) was examined in the mouse, rabbit, and guinea pig, each of which is characterized by a different type of retinal vascularization. In all three species, the bulk of the ferritin remained in the capillary lumina, where it appeared to be blocked at the level of the diaphragmed fenestrae. Some ferritin was present in endothelial cell vacuoles. The results confirm previous work on the rat choriocapillaris and indicate that the barrier function of the choriocapillary endothelium is present even among species in which the retinal circulation differs significantly.Supported by NIH grant EY03418