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建筑施工安全管理问题越来越成为建筑业一个不可忽视的现实问题。施工管理当然离不开“管”和“理”。要“管”好人手的分配,也要“理”顺施工的程序。要随时纠正施工现场各种违章、违反施工安全操作规程及现场施工安全管理规定的倾向性。实行有目标的组织协调控制是基层施工技术的一项十分关键的工作。 相似文献
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报道了中国爵床科Acanthaceae爵床亚科Ruellioideae鳞花草族Lepidagathideae 1属、穿心莲族Andrographideae 2属和爵床族Justicieae 8属共14种植物的花粉形态。根据花粉萌发孔类型和外壁纹饰特征,可将这些植物的花粉归为4个类型: (1)具3孔沟,外壁具网状纹饰。该类型见于色萼花属Chroesthes (采自广西样品)和穿心莲属Andrographis植物。(2)具3孔沟及假沟(肋条带型)类型,外壁具网状纹饰,网眼纵向排列成行,网眼内有细网纹。该类型见于色萼花属(采自云南样品)和鳔冠花属Cystacanthus。(3)具3孔沟,沟两侧各有1条假沟,外壁具网状纹饰。该类型见于瑞丽山壳骨Pseuderanthemum shweliense、狗肝菜属Dicliptera和驳骨草属Gendarussa植物。(4)具2孔沟,沟两侧具斑块。该类型见于山壳骨属Pseuderanthemum 1种、纤穗爵床属Leptostachya、鳄嘴花属Clinacanthus、鸭嘴花属Adhatoda、杜根藤属Calophanoides和野靛棵属Mananthes植物。 相似文献
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崔鸿宾 《中国科学院研究生院学报》1987,25(3):161-171
This paper is an attempt to discuss the relationship and phylogeny within the genus
Lindera, based upon on analysis of shortened brachlets, on which the inflorescences are inserted,
and other morphological characters. The shortened branchlets are metamorphic shoots which
are often at the transitional stage between branchles and inflorescences. The advanced shortened
branchlets usually with an undeveloped terminal bud, posses scale-like leaves, and the inflore-
scences so formed are sessile and aggregate. In primitive taxa, such as Lindera nacusua (Don)
Merr., L. gracilipes H. W. Li and L. tanchuanensis Feng et H. S. Kung, the branchlet is usually
not shortened, with well-developed terminal bud, forming a single axillary pseudo-umbel, while
its peducle is usually very slender and stamens of pistillate flower sometimes more or less deve-
loped. The leaves on the upper part of branchlet are normal and the lower part of branchlet
becoming bracteal, In the genus the development of shortened branchlets (Fig. 1.) from the
ones in the primitive taxa to the ones in the advanced taxa may be found.
Other important morphological characters are the length of peducles. The peduncle is
usually slender in the primitive taxa, short or even sessile in the adanced taxa.
There are two types of venation in the genus: the pinnate and trinerved. As the primitive
group trib. Perseeae Mez shows pinnate veins, pinnate ventation in Lindera is more primitive
than trinerved one.
It might be possible that a transition occure in the genus from evergereen habit to deciduous
one as shown in Lindera glauca B1., L. angustifolia Cheng and L. praecox B1., whose leaves tar-
dily wither but persistent over winter.
The relationships within Lindera are shown in a hypothetical genealogical tree (Fig. 4),
which includes the system of Litsea, developed parallelly with Lindera.
From the study of morphological characters, the author infers that both Lindera and Litsea
have originated from a common ancestory related to the tribe Cinnamomeae Baill. which has a
single axillary inflorescence, with hermaphrodite flowers, 4-locular anthers and penninerved to
trinerved leaves. 相似文献
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报道了国产爵床科Acanthaceae山牵牛属Thunbergia(山牵牛亚科Thunbergioideae)6种、叉柱花属Staurogyne(瘤子草亚科Nelsonioideae)和老鼠簕属Acanthus(老鼠簕亚科Acanthoideae)各1种植物在扫描电镜下的花粉形态。山牵牛属植物的花粉粒为圆球形,均具螺旋状萌发孔,外壁纹饰以光滑或颗粒状为主,偶具棒状突起。具螺旋状萌发孔被认为是该科独特而较原始的花粉特征。叉柱花属的花粉粒为圆球形,具3孔沟,外壁平滑。老鼠簕属的花粉粒为长球形,具3沟,外壁具细网状纹饰或具小穿孔。花粉形态特征支持传统上将上述3属置于3个不同亚科的处理。 相似文献
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