Abstract：
:There is a direct correlation between the level of GBS beta-hemolysin expression and the ability of GBS to injury lung epithelial cells. Electron microscopy suggest the hemolysin acts as a pore-forming cytolysin. beta-hemolysin-associated lung epithelial cell injury is inhibited by surfactant phospholipid, a substance in which high-risk premature infants are deficient. We have now shown that loss of GBS hemolysin activity is associated with decreased animal virulence following intrathoracic inoculation of the organism. Further, a knockout of a putative GBS beta-hemolysin gene from the literature suggests it is not the major GBS hemolysin determinant. Cloning and sequencing analysis of the Tn916 (or Tn916DE) insertions in three of our nonhemolytic GBS mutants show identical integration sites in a distinct chromosomal locus. Finally, a putative 11-kd hemolysin species is identified by comparative analysis of protein extracts from isogenic hemolysin mutants.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Nizet V,Gibson RL,Rubens CEdoi
10.1007/978-1-4899-1825-3_146subject
Has Abstractpub_date
1997-01-01 00:00:00pages
627-30eissn
0065-2598issn
2214-8019journal_volume
418pub_type
杂志文章abstract：:Cancer cell heterogeneity is a universal feature of human tumors and represents a significant barrier to the efficacy and duration of anticancer therapies, especially targeted therapeutics. Among the heterogeneous cancer cell populations is a subpopulation of relatively quiescent cancer cells, which are in the G0/G1 c...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-3-030-22254-3_15
更新日期：2019-01-01 00:00:00
abstract：:Multidrug-resistance (MDR), caused by overexpression of either P-glycoprotein (Pgp) or the multidrug-resistance associated protein (MRP), is characterised by a decreased cellular drug accumulation. One form of MDR is the sequestration of the drug inside cytoplasmic vesicles followed by an a exocytotic and/or efflux pr...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4615-4811-9_17
更新日期：1999-01-01 00:00:00
abstract：:Premature ovarian insufficiency (POI) or primary ovarian failure is defined as a cessation of the menstrual cycle in women younger than 40 years old. It is strictly defined as more than 4 months of oligomenorrhea or amenorrhea in a woman <40 years old, associated with at least two follicle-stimulating hormone (FSH) le...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-981-33-4187-6_4
更新日期：2021-01-01 00:00:00
abstract：:ATP binding cassette (ABC)-containing drug efflux transporters play important roles in regulating intracellular drug concentrations that determine cell sensitivity to chemotherapeutic agents. Of particular relevance to cancer chemotherapy are the transporters P-glycoprotein (Pgp) encoded by multidrug resistance 1 gene...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-0-387-74039-3_2
更新日期：2007-01-01 00:00:00
abstract：:The discovery of the first homeotic mutation by Calvin Bridges in 1915 profoundly influenced the way we think about developmental processes. Although many mutations modify or deform morphological structures, homeotic mutations cause a spectacular phenotype in which a morphological structure develops like a copy of a s...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4419-6673-5_2
更新日期：2010-01-01 00:00:00
abstract：:A multilayered epithelium to fulfil its function must be replaced throughout the lifespan. This is possible due to the presence of multipotent, self-renewing epidermal stem cells that give rise to differentiated cell lineages: keratinocytes, hairs, as well as sebocytes. Till now the molecular mechanisms responsible fo...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-3-030-31206-0_12
更新日期：2019-01-01 00:00:00
abstract：:This review summarizes key aspects of what has been learned about the physiology of pancreatic islets and leptin deficiency from studies in obese ob/ob mice. ob/ob Mice lack functional leptin. They are grossly overweight and hyperphagic particularly at young ages and develop severe insulin resistance with hyperglycemi...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-90-481-3271-3_20
更新日期：2010-01-01 00:00:00
abstract：BACKGROUND:Long term steroid therapy is complicated by osteoporosis and generalised thinning of the skin. These two complications of long term corticosteroid therapy were routinely assessed at the Menopause Clinic of St. Luke's Hospital, Medical School, University of Malta. METHODS:A cross sectional study was performe...
journal_title：Advances in experimental medicine and biology
pub_type： 临床试验,杂志文章
doi：10.1007/978-1-4615-4857-7_65
更新日期：1999-01-01 00:00:00
abstract：:12-lipoxygenase (12-LOX) expression and function in the regulation of the metastatic phenotype was demonstrated in several murine melanoma lines before. Here we have provided novel evidences that, though at a low level (in max. 15% of the cell population), human melanoma lines (HT168, M1, HT199, HT18 and WM35) express...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4615-4793-8_89
更新日期：1999-01-01 00:00:00
abstract：:The increased Ca(2+)-responsiveness in end-stage human heart failure cannot be attributed to contractile protein isoform changes, but rather is the complex resultant of changes in degree of phosphorylation of VLC-2 and TnI. Despite the decreased basal level of VLC-2 phosphorylation the response to VLC-2 dephosphorylat...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4419-9029-7_1
更新日期：2003-01-01 00:00:00
abstract：:The identification and characterization of microRNAs (miRNAs) is a rapidly growing area of research also in dermatology. Skin represents the largest organ in the human body, and its morphogenesis has been shown to require a highly coordinated and undisrupted miRNA profile. High expression of several miRNAs in the epid...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-3-319-22671-2_16
更新日期：2015-01-01 00:00:00
abstract：:The gene coding for the surface spike protein gp195 of TGEV has been cloned and expressed in E. coli in the form of fusion proteins. These proteins were isolated and used to immunize laboratory animals. All animals developed antibodies cross-reacting with the TGEV virion but failed to neutralize the virus. The entire ...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4684-7974-4_4
更新日期：1985-01-01 00:00:00
abstract：:So far, more than 20 species of Ganoderma (Lingzhi) fungi have been studied, including G. lucidum, G. sinense, G. japonicum, G. capense, G. australe, G. tsugae, G. applanatum, G. tropicus, G. boniense, G. duropora, G. resinaceum, G. theaecolum, G. cochlear, G. atrum, G. formosanum, G. boninense, G. colossum, G. concin...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-981-13-9867-4_3
更新日期：2019-01-01 00:00:00
abstract：:The Microprocessor, comprising the ribonuclease Drosha and its essential cofactor, the double-stranded RNA-binding protein, DGCR8, is essential for the first step of the miRNA biogenesis pathway. It specifically cleaves double-stranded RNA within stem-loop structures of primary miRNA transcripts (pri-miRNAs) to genera...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：
更新日期：2010-01-01 00:00:00
abstract：:Anthropogenically generated underwater noise in the marine environment is ubiquitous, comprising both intense impulse and continuous noise. The installation of offshore wind farms across the North Sea has triggered a range of ecological questions regarding the impact of anthropogenically produced underwater noise on m...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4939-2981-8_23
更新日期：2016-01-01 00:00:00
abstract：:Our studies highlight the importance of dietary vitamin A (retinol) and other retinoids in maintaining normal cervical cell function and in inhibiting the growth of cervical tumors. Based on our results we conclude that 1) HPV 16-immortalization enhances cervical cell sensitivity to retinoids, 2) cytokeratin expressio...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：
更新日期：1995-01-01 00:00:00
abstract：:R3230Ac mammary tumors were grown in transparent window chambers implanted into the dorsal skin flap of 250 g Fischer 344 rats (see Dewhirst et al, 1992). The oxygen pressure distributions in the tumor and host tissue were measured by the oxygen dependent quenching of phosphorescence (see Vinogradov et al, 1996) after...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4615-4863-8_71
更新日期：1998-01-01 00:00:00
abstract：:Drug resistance is a serious impediment to the treatment of cancer. The use of anti-epidermal growth factor receptor (EGFR) monoclonal antibody therapies in patients with metastatic colorectal cancer is guided by the presence of activating point mutations in KRAS and NRAS genes in the primary tumour. However, RAS wild...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-3-030-02771-1_9
更新日期：2018-01-01 00:00:00
abstract：:The relationships between bilayer lipid, diffusional and conformational activities of oxidoreduction components, and electron transfer activity in the mitochondrial inner membrane are considered. Using a new, low pH method to fuse liposome phospholipid (asolectin) with the isolated mitochondrial inner membrane, the me...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4757-1419-7_26
更新日期：1980-01-01 00:00:00
abstract：:Various disciplines of chemical engineering, especially thermodynamics and kinetics, play an important role in medicinal research and this has been particularly recognized during the last 10-15 years (von Stockar and van der Wielen, J Biotechnol 59:25, 1997; Prausnitz, Fluid Phase Equilib 53:439, 1989; Prausnitz, Pure...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-3-319-08939-3_10
更新日期：2015-01-01 00:00:00
abstract：:Effective strategies for primary prevention are urgently needed to combat the rapidly increasing prevalence of childhood obesity. Evidence accumulates that early nutrition programmes later obesity risk. Breast feeding reduces the odds ratio for obesity at school age, adjusted for biological and sociodemographic confou...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/1-4020-3535-7_12
更新日期：2005-01-01 00:00:00
abstract：:Storage of fluorescent products, ceroid-like pigments was observed in P388D1 cells, an established macrophage-like cell line, when the cells were cultured in the presence of rat liver phosphatidylcholine liposomes containing polyunsaturated fatty acids. Some fluorescent products accumulated in the cells were extractab...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4899-5339-1_23
更新日期：1989-01-01 00:00:00
abstract：:The effects of exposure to continuous and intermittent anthropogenic sounds on temporary hearing threshold shifts (TTSs) in a harbor porpoise were investigated by testing hearing before and after exposure to 1- to 2-kHz downsweeps of 1 s, without harmonics, presented as paired-intermittent and continuous-exposure comb...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4939-2981-8_63
更新日期：2016-01-01 00:00:00
abstract：:We investigated the relation between blood pressure and cerebral oxygenation (COX) immediately after exercise in ten healthy males. Subjects completed an exercise and recovery protocol while breathing either 21% (normoxia) or 14.1% (hypoxia) O2 in a randomized order. Each exercise session included four sets of cycling...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4939-3023-4_12
更新日期：2016-01-01 00:00:00
abstract：:We have developed an approach termed '2D hybrid analysis' for building three-dimensional (3D) structures from electron microscopy (EM) images of biological molecules. The key advantage is that it is applicable to flexible molecules, which are difficult to analyze by the approach in which 3DEM maps are reconstructed. I...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-981-13-2200-6_12
更新日期：2018-01-01 00:00:00
abstract：:According to our present knowledge hypometabolism and hypothermia in uremia are most probably due to direct actions of toxic substances at the cellular level. A cardiovascular etiology seems less possible. A similar reduction of oxygen consumption as observed in uremia can be produced by 5 mg/kg body wt. indole i.p. A...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4684-8240-9_13
更新日期：1987-01-01 00:00:00
abstract：:Cutaneous receptors in the foot sole appear to contribute to the control of human stance and locomotion. Two approaches were undertaken to establish the characteristics of the receptors in the sole. Psychophysical vibrotactile thresholds (range 25-400 Hz) were determined across the unloaded sole in young and elderly s...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4615-0713-0_14
更新日期：2002-01-01 00:00:00
abstract：:Ceramides are bioactive sphingolipids that support the structure of the plasma membrane and mediate numerous cell-signaling events in eukaryotic cells. The finding that ceramides act as second messengers transducing cellular signals has attracted substantial attention in several fields of Biology. Since all cells cont...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-3-030-21735-8_15
更新日期：2019-01-01 00:00:00
abstract：:The formation of meat mutagens has been studied the last 10 years by carrying out modeling and meat cooking experiments in parallel. During this time, the list of meat mutagens has been growing, and continues to grow. The meat mutagens are usually produced in the crust of animal foods during frying, broiling, and baki...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4899-2626-5_7
更新日期：1991-01-01 00:00:00
abstract：:The secretory granules of pancreatic beta cells are specialized organelles responsible for the packaging, storage and secretion of the vital hormone insulin. The insulin secretory granules also contain more than 100 other proteins including the proteases involved in proinsulin-to insulin conversion, other precursor pr...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-3-030-12668-1_2
更新日期：2019-01-01 00:00:00
