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1Both sexual and apomictic embryo sacs were co-existed which belonged to facultative apomixis.

2在有性生殖胚囊中,可观察到完整的八核胚囊。

It is concluded that the initial ancotomic site of blood island genesis may be is mesoblast of extraembryonic blastoderm rather than the yolk sac; the blood vessel endothelium cells and the blood cells are generated parallel; the PGCs are the common ancestry of angioblast and HSC.

血岛最早发生的解剖位置可能不是卵黄囊而是胚外胚盘中胚层,血管内皮细胞与血细胞平行发生,PGC是成血管-造血干细胞的共同祖先。

The central portion of an ovule in which the embryo sac develops ;the megasporangium.

珠心胚珠的中心,胚芽囊在此发育;大孢子囊

Histological structures of bursas of Fabricius were observed at the different developmental stages from chicken embryoes to chickens. The results were as follows. The bursa of Fabricius began to develop on the 13th day of post-hatching and its cell aggregated into the nodosity clique underneath the epithelium mucosae. On the 15th day of post-hatching, those cell cliques were surrounded by the flat epithelium and formed the basic structure of folliculus lymphaticus. The number of lymphocytes in the folliculus lymphaticus increased gradually, and the medulla and cortex of a majority of folliculus were not discriminated obviously. Until on the 7th day for chickens, the medulla and cortex of folliculus formed completely and the number of folliculus increased significantly. From 21 to 35 days old, the folliculus lymphaticus transformed from polygon into rectangle. Mucosa epithelial cells increased gradually and their cytoblasts arranged compactly into aline in the basilar part on the 35th day.

本研究观察了从鸡胚到出壳后的不同生长发育阶段法氏囊的组织结构,结果表明:胚胎13日龄时,法氏囊开始发育,粘膜上皮下形成结节状细胞集团;胚胎15日龄,聚集的细胞集团形成初始的淋巴滤泡;胚胎18日龄到出壳后1日龄,滤泡内淋巴细胞数量增多,多数滤泡髓质和皮质界限仍不明显;7日龄雏鸡法氏囊髓质皮质分界清晰,滤泡数量显著增多;21日龄到35日龄,滤泡由多边形逐渐转变成长方形;在35日龄时,粘膜上皮细胞逐渐增多,排列紧密,细胞核紧密排列成直线位于基底部。

Could be observed on 10th day after pollination, archesporial cell on 20thday, megasporocyte on 24th day, the functional megaspore on 30th day; and 8-nucleate embryo sac on 41th day. And then double fertilization finish and early globular embryo emerg.

授粉10 d出现指状突起,20 d形成胚珠原基,24 d大孢子母细胞发生,30 d功能大孢子形成,41 d发育为成熟的八核胚囊,而后完成双受精发育成早期球形胚。

The 52 cases (57.78%)were with type of uterine tube clumps, and the feature of acoustic image showed clump echo were irregularity boundary, internal echo were uneven, gestational sac were not clear and there were a little or a few of fluidify when tubal pregnancys were ruptured.

输卵管妊囊型27例(30.00%),表现为较完整胎囊强回声光环,部分见胚芽;输卵管包块型52例(57.78%),表现为边界不规则的包块回声,内部回声不均匀,胎囊显示不清楚;输卵管妊娠破裂出血时盆腔可见少或中量积液等。

Morphology of sexual reproduction abortion in'High Noon', a distant hybridization cultivar of tree peonies(P.delavayi var. lutea×P. suffruticasa), was systematically investigated with light microscopy and cross. The results indicated that:(1)The stamens matured earlier than the gynoecia and pollens dispersed at the early stage of anthesis but the rate of normal 2-celled pollens were merely 2.41%.

采用光镜和杂交等方法对牡丹远缘杂交一代品种'正午'有性生殖败育进行系统形态学观察发现:(1)雄蕊较雌蕊先成熟,初花期即散粉,正常2-细胞花粉仅占2·41%,且花粉在多种培养液中、在自身和其它两种柱头上均不萌发;柱头在谢花期大量分泌粘液,进入最佳授粉状态;(2)同一胚珠中多个大孢子母细胞减数分裂高度不同步,胚囊发育与受精延迟,部分胚乳游离核在细胞化时期分裂异常;(3)自花及品种内异花授粉不结实,天然授粉结实率为0·053‰~0·130‰。

Four field strains of infectious bronchitis viruswere isolated from chicken kidney, trachea and lung of the young layer flocks in some regions of Shaanxi province. Biological characterizations of the virus were investigated by virus pathogenicity to chicken embryo and healthy chickens, hemagglutination test, hemagglutination inhibition test, dwarfing embryonated chicken eggs, electron microscopy and reverse transcription polymerase chain reaction. It demonstrated that allantoic fluid of each passage virus could hemagglutinate chicken red blood cells by treatment with 1% trypsin. The standard positive serum to IBV could inhibited the hemagglutination. The isolates could make respiratory and kidney diseases in chickens.

采集陕西省宝鸡市、扶风县、兴平市和榆林市等地鸡场疑似传染性支气管炎发病鸡病料,通过9~11 日龄非免疫鸡胚进行了病毒的实验室分离和传代,并对分离毒株进行了病毒的血凝性、血凝抑制性、致病性、鸡胚矮小化、电镜特征等生物学特性鉴定,结果表明,4 株分离株经1%胰酶处理后的各代病毒尿囊液均可凝集鸡红细胞,标准阳性血清可特异性的抑制其凝集性,回归试验可复制出与自然发病相同的病例,病毒传代物有明显的致鸡胚矮小化作用,透射电镜下可见有近似球形、直径100 nm左右的冠状病毒粒子,将分离鉴定的4 株IBV 定名为BJ-04、FF-04、XP-03 和YL-04。

Uterine cross-section diameter of 4.8cm × 3.9 cm × 3.9 cm, increased intra-uterine pregnancy sac see the size of 1.3 cm * 0.9 cm * 1.6 cm, intracapsular see yolk sac, no embryo and fetal heart throb teeth.

子宫切面内径4.8cm×3.9㎝×3.9㎝,增大子宫内见妊娠囊大小1.3㎝*0.9㎝*1.6㎝,囊内见卵黄囊,未见胚牙及胎心搏动。

Lab.of Genetics and Breeding of Crop,South China Agr.

本文以单胚水稻IR36作为对照,系统观察了多胚水稻品系APⅣ的胚胎发生过程,包括胚囊的形成、发育、受精及其胚胎发育;。。。

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