剪切波弹性成像定量参数对乳腺肿块良恶性的鉴别价值及其与组织Ki-67和C-erbB-2表达的关系研究

摘要 目的：探讨剪切波弹性成像（SWE）定量参数对乳腺肿块良恶性的鉴别价值,分析其与组织Ki-67和表皮生长因子受体2（C-erbB-2）表达的关系。方法：选择2021年1月至2022年1月于湖南省妇幼保健院超声医学科行乳腺SWE检查的106例乳腺肿块患者,根据术后或组织活检的病理检查结果分为恶性组59例和良性组47例。对比恶性组和良性组SWE参数的差异以及不同Ki-67和C-erbB-2表达乳腺癌病灶SWE参数的差异。Spearman分析乳腺癌病灶SWE参数与乳腺癌组织Ki-67和C-erbB-2表达的相关性。绘制受试者工作特征（ROC）曲线分析乳腺病灶SWE参数鉴别乳腺肿块良恶性的价值。结果：恶性组AE-max、Shell1 E _max 、Shell2 E _max 、Shell3 E _max 高于良性组（P＜0.05）。联合AE-max、Shell1 E _max 、Shell2 E _max 、Shell3 E _max 鉴别乳腺肿块良恶性的曲线下面积为0.841,高于单独参数鉴别的0.657、0.599、0.642、0.609（P＜0.05）。Ki-67阳性组、C-erbB-2阳性组AE-max、Shell1 E _max 、Shell2 E _max 、Shell3 E _max 高于阴性组（P＜0.05）。乳腺癌病灶AE-max、Shell1 E _max 、Shell2 E _max 、Shell3 E _max 与Ki-67和C-erbB-2表达均呈正相关（P＜0.05）。结论：乳腺恶性肿块与良性肿块的SWE参数存在明显差异,且与乳腺癌组织的Ki-67、C-erbB-2阳性表达有关,乳腺SWE检查有助于鉴别乳腺肿块良恶性。     

Plant regeneration from protoplasts of mango (Mangifera indica L.) through somatic embryogenesis

 This report describes a protocol for the regeneration of plants from protoplasts isolated from proembryogenic masses (PEMs) in a suspension culture derived from the nucellar callus of mango (Mangifera indica L. cv 'Amrapali'). The maximum yield (24.6±1.1×10⁶), with 81.04±4.1% viable protoplasts per gram PEMs, was obtained with an enzyme mixture containing 1.2% cellulase, 1.0% hemicellulase and 0.6% pectinase. An optimum density of 5×10⁴ cultured protoplasts per milliliter culture medium was required for the highest frequency (88.89±5.40%) of division. Dividing protoplasts developed into microcalli that proliferated on medium supplemented with growth regulators (auxins or kinetin alone, or auxins with kinetin) and produced somatic embryos after transfer to a growth regulator-free medium. The protocallus on 2,4-D-containing medium produced the maximum number (102.50±6.93) of somatic embryos. Maturation of somatic embryos depended upon the presence, and the nature and combination of growth regulators in the medium during proliferation of the callus. The mature somatic embryos germinated and developed into plants that were transferred to soil. Received: 1 April 1999 / Revision received: 27 July 1999 / Accepted: 23 August 1999     

A chain kinematic model to assess the movement of lower-limb including wobbling masses

Computer simulation models have shown that wobbling mass on the lower limb affects the joint kinetics. Our objective was to propose a non-invasive method to estimate bones and wobbling mass kinematics in the lower limb during hopping. The chain kinematic model has set degrees of freedom at the joints and free wobbling bodies. By comparison to a model without wobbling bodies, the marker residual was reduced by 20% but the joint kinematics remains unchanged. Wobbling bodies’ displacements reached 6.9 ± 3.5° and 6.9 ± 2.4 mm relative to the modelled bones. This original method is a first step to assess wobbling mass effect on joint kinetics.     

Microbial Degradation of Mustard Gas Reaction Masses: Isolation and Selection of Degradative Microorganisms,Analysis of Organic Components of Reaction Masses,and Their Biodegradation

Bacterial strains growing in medium with mustard gas reaction masses (RM) as the carbon source were obtained. Growth cessation in the above medium was caused by the exhaustion of bioutilizable substrates, first of all monoethanolamine (MEA) and ethyleneglycol (EG), rather than by the accumulation of toxic metabolites in the culture liquid or in the cells. The main RM components, 1,4-perhydrothiazines (PHT), formed in the course of chemical detoxication of mustard gas, were identified and analyzed. The predominant component of the PHT mixture was N-(2-hydroxyethyl)-2-methyl-1,4-perhydrothiazine hydrochloride. Concentrations of all the PHT decreased by 50% in the course of culture growth; their destruction was a result of microbial metabolism.     

Effect of Indol-3-yl Acetic Acid on Photosynthetic Characteristics of Wheat Flag Leaf During Grain Filling

Area and fresh and dry masses of flag leaf show two phases of development during grain filling in Triticum aestivum. The initial large increase in leaf size is mainly due to water intake. Contents of chlorophylls and carotenoids, reducing sugars, and sucrose, Hill reaction rate, and photosynthetic activity increased during leaf growth, but a noticeable decline in these parameters followed throughout leaf senescence. The maximum accumulation of polysaccharides and proteins occurred at the beginning of grain set, but a continuous decline in their absolute values was manifested during grain filling. Grain priming with indol-3-yl acetic acid (IAA) at 25 mg kg^-1 stimulated the flag leaf growth, namely its fresh and dry masses and its area. Furthermore, the stimulatory effect was mainly due to the increase in the pigment formation that in turn increased the photosynthetic activity of flag leaf during grain filling. On the other hand, the highest dose of IAA (50 mg kg^-1) attenuated the growth and physiological activity of flag leaf through its inhibitory action on leaf fresh and dry masses, leaf area, pigments, saccharides and protein formation, as well as its effect on ¹⁴CO₂ assimilation.     

Gentamicin inhibits HSP70-assisted protein folding by interfering with substrate recognition

We previously reported that gentamicin (GM) specifically binds to heat-shock protein with subunit molecular masses of 70 kDa (HSP70). In the present study, we have investigated the effects of GM binding on HSP70-assisted protein folding in vitro. The C-terminal, and not the N-terminal of HSP70 was found to bind to GM. GM significantly suppressed refolding of firefly luciferase in the presence of HSP70 and HSP40, although the ATPase activity of HSP70 was unaffected by GM. A surface plasmon resonance analysis revealed that GM specifically interferes with the binding of HSP70 to a model peptide that mimics the exposed hydrophobic surface of the folding intermediates. These results indicated that GM inhibits the chaperone activity of HSP70 and may suppress protein folding via inhibition of HSP70 in vivo.

Structured summary

MINT-7384283: HSP40 (uniprotkb:P25685) binds (MI:0407) to HSP70 (uniprotkb:P34930) by surface plasmon resonance (MI:0107)MINT-7384430: RNaseA (uniprotkb:P61823) binds (MI:0407) to HSP70 (uniprotkb:P34930) by surface plasmon resonance (MI:0107)     

用岩屑样定量研究南海西北陆架古环境*

对南海西北陆架２３口浅海钻孔的１０１个碉屑样及西太平洋２个深海钻探（ＤＳＤＰ）钻孔的１０个岩芯样中大于０．１５４ｍｍ的浮游有孔虫进行定量分析,共得浮游有孔虫１２属４７种。采用微体古生物学、生物地层学与数理统计（聚类分析、目标因子分析、目标转换函数法）和同位素地球化学相结合及时间ｍｕｌｔｉｃａｍｅｒａｔａ未现面之上两个时间面的古环境,再造了南海西北陆架上新世末至更新世初古海洋变迁的历史。     

Significant mortality of eggs and young larvae of two pine processionary moth species due to the entomopathogenic fungus Metarhizium brunneum

Bioassays were conducted to determine the susceptibility of egg masses and young larvae of two pine processionary moth species, Thaumetopoea pityocampa and Thaumetopoea wilkinsoni, to two strains (ARSEF4556, V275) of the entomopathogenic fungus Metarhizium brunneum. Mortality of treated eggs by both strains ranged from 96% to 99% but not all of this was caused by M. brunneum since control groups also experienced egg mortality due to saprophytic fungi. Still, larvae hatched in the laboratory from eggs treated with M. brunneum were all killed by this fungus, acquiring M. brunneum conidia, whereas larval mortality was 0% in the control groups. Young larvae of both pine processionary moth species were also highly susceptible to ARSEF4556 and V275 with larval mortality ranging between 94% and 100%, 8 days post-inoculation, with the vast majority of larvae being killed within the first 2–4 days. Larval mortality was dose dependent. Results were consistent across the two pine processionary moth species, showing that the pathogenicity of M. brunneum to both eggs and young larvae might be promising for biological control of these insect pests. The study also showed that non-target parasitoids of pine processionary moth eggs were also susceptible to M. brunneum. Further work is required to understand and reduce the M. brunneum effect on non-target insects.     

Resource limitation and recruitment patterns in a coral reef fish assemblage

The potential effects of food and shelter availability on the recruitment and early survivorship of coral reef fishes were studied on St. Croix, U.S. Virgin Islands. The faunal assemblage studied included diurnally active fishes found in the “rubble/sand” habitat. The most abundant members were: beaugregory, Stegastes leucostictus (Muller & Troschel), goldspotted goby, Gnatholepis thompsoni Jordan, bridled goby, Coryphopterus glaucofraenum Gill, surgeonfishes, Acanthurus bahianus Castelnau and A. chirurgus (Bloch), and French grunt, Haemulon flavolineatum (Desmarest). Comparisons of recruitment to reefs constructed from substrata that varied in morphological characteristics showed that there were differences in the relative abundances of recruits attracted to and/or surviving on the different reef types. Juveniles of most species appeared to prefer the branching coral Porites porites (Pallas), which provided a large number of small crevices between the branches.Manipulations of the availability of shelter sites for fishes demonstrated that recruitment and/or early survivorship were strongly limited by the number of refuges. This result was found in six separate carried out during different years and in different seasons. Shelter site availability presumably limits fish populations through its effects on prédation rates.Experimental manipulations of food availability indicated that food does not directly influence settlement or early survivorship of coral reef fishes. However, it is probable that correlations between habitat characteristics and food availability have influenced the evolution of settling preferences.