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291.
Accumulation, organic carbon and dry matter concentration of sediment in commercial channel catfish ponds 总被引:2,自引:0,他引:2
James A. Steeby John A. Hargreaves Craig S. Tucker Sue Kingsbury 《Aquacultural Engineering》2004,30(3-4):115-126
Sediment depth and organic carbon (OC) concentration were measured in sediment cores (n=675) collected from 45 commercial channel catfish ponds in northwest Mississippi from April to September in 1998 and 1999. Ponds had been in continuous catfish production from 14 days to 21 years. Sediment depth ranged from 1 to 95 cm and was heterogeneously distributed within ponds: least in the shallow end (26.3 cm) and greatest in deeper areas (33.7 cm). Mean sediment depth increased with pond age, although the rate of sediment accumulation was greatest in the first year (12.5 cm per year). Organic carbon concentration varied slightly within ponds ranging from 0.76 to 3.43% of dry matter (DM). Mean organic carbon concentration in the upper 2 cm of sediment (1.77%) was significantly greater than in the deeper sediment layer (1.55%). Mean dry matter content in the upper 2 cm of sediment averaged 24.2% of total wet weight. Mean dry matter for the lower sediment fraction was 37.8% of total wet weight. Despite large inputs of organic matter from feed and primary production, sediment organic carbon concentrations did not increase with pond age. 相似文献
292.
通过对若干对氨基苯磺酰胺类衍生物对水稻白叶枯病(Xanthomonas oryzae)离体及活体测定结果表明,酰胺基上的一个氢原子被(?)等基团取代后体内及体外均有明显的生物活性,被烷烃基取代后体内外均无明显的活性,其余取代基介于两者之间。离体测定结果表明,水稻白叶枯病菌对磺胺类化合物最敏感,果树根癌病菌次之,十字花科蔬菜软腐病菌敏感性最差。将菌体代谢物——对氨基苯甲酸以一定比例混入磺胺类化合物,可抵消磺胺类化合物对水稻白叶枯病的防治效果。混入量愈大,抵消程度愈明显。暗示这类化合物对水稻白叶枯病的抗菌活性属于竞争性抑制作用原理。 相似文献
293.
Hwang WS Roh SI Lee BC Kang SK Kwon DK Kim S Kim SJ Park SW Kwon HS Lee CK Lee JB Kim JM Ahn C Paek SH Chang SS Koo JJ Yoon HS Hwang JH Hwang YY Park YS Oh SK Kim HS Park JH Moon SY Schatten G 《Science (New York, N.Y.)》2005,308(5729):1777-1783
Patient-specific, immune-matched human embryonic stem cells (hESCs) are anticipated to be of great biomedical importance for studies of disease and development and to advance clinical deliberations regarding stem cell transplantation. Eleven hESC lines were established by somatic cell nuclear transfer (SCNT) of skin cells from patients with disease or injury into donated oocytes. These lines, nuclear transfer (NT)-hESCs, grown on human feeders from the same NT donor or from genetically unrelated individuals, were established at high rates, regardless of NT donor sex or age. NT-hESCs were pluripotent, chromosomally normal, and matched the NT patient's DNA. The major histocompatibility complex identity of each NT-hESC when compared to the patient's own showed immunological compatibility, which is important for eventual transplantation. With the generation of these NT-hESCs, evaluations of genetic and epigenetic stability can be made. Additional work remains to be done regarding the development of reliable directed differentiation and the elimination of remaining animal components. Before clinical use of these cells can occur, preclinical evidence is required to prove that transplantation of differentiated NT-hESCs can be safe, effective, and tolerated. 相似文献
294.
Obesity and metabolic syndrome in circadian Clock mutant mice 总被引:2,自引:0,他引:2
Turek FW Joshu C Kohsaka A Lin E Ivanova G McDearmon E Laposky A Losee-Olson S Easton A Jensen DR Eckel RH Takahashi JS Bass J 《Science (New York, N.Y.)》2005,308(5724):1043-1045
295.
296.
Muller CB Ride SM Fouke J Whitney T Denton DD Cantor N Nelson DJ Plummer J Busch-Vishniac I Meyers C Rosser SV Schiebinger L Roberts E Burgess D Beeson C Metz SS Sanders L Watford BA Ivey ES Frank Fox M Wettack S Klawe M Wulf WA Girgus J Leboy PS Babco EL Shanahan B Didion C Chubin DE Frize M Ganter SL Nalley EA Franz J Abruña HD Strober MH Zimmer Daniels J Carter EA Rhodes JH Schrijver I Zakian VA Simons B Martin U Boaler J Jolluck KR Mankekar P Gray RM Conkey MW Stansky P Xie A Martin P 《Science (New York, N.Y.)》2005,307(5712):1043
297.
Woo HA Chae HZ Hwang SC Yang KS Kang SW Kim K Rhee SG 《Science (New York, N.Y.)》2003,300(5619):653-656
The active-site cysteine of peroxiredoxins is selectively oxidized to cysteine sulfinic acid during catalysis, which leads to inactivation of peroxidase activity. This oxidation was thought to be irreversible. However, by metabolic labeling of mammalian cells with 35S, we show that the sulfinic form of peroxiredoxin I, produced during the exposure of cells to H2O2, is rapidly reduced to the catalytically active thiol form. The mammalian cells' ability to reduce protein sulfinic acid might serve as a mechanism to repair oxidatively damaged proteins or represent a new type of cyclic modification by which the function of various proteins is regulated. 相似文献
298.
Kim N Huang SN Williams JS Li YC Clark AB Cho JE Kunkel TA Pommier Y Jinks-Robertson S 《Science (New York, N.Y.)》2011,332(6037):1561-1564
The ribonuclease (RNase) H class of enzymes degrades the RNA component of RNA:DNA hybrids and is important in nucleic acid metabolism. RNase H2 is specialized to remove single ribonucleotides [ribonucleoside monophosphates (rNMPs)] from duplex DNA, and its absence in budding yeast has been associated with the accumulation of deletions within short tandem repeats. Here, we demonstrate that rNMP-associated deletion formation requires the activity of Top1, a topoisomerase that relaxes supercoils by reversibly nicking duplex DNA. The reported studies extend the role of Top1 to include the processing of rNMPs in genomic DNA into irreversible single-strand breaks, an activity that can have distinct mutagenic consequences and may be relevant to human disease. 相似文献
299.
Olivia A. Petritz Natalie Antinoff Catherine Pfent Wayne Corapi Roy R. Pool Michelle Fabiani Sue Chen 《Journal of Exotic Pet Medicine》2013,22(3):287-292
A 4-year-old, castrated, male domestic ferret (Mustela putorius furo) was evaluated for a possible upper respiratory tract infection and wheezing for approximately 3 weeks. Supportive care for a suspected upper respiratory tract infection was initiated; however, the patient became progressively more dyspneic over the next 48 hours. A possible tracheal mass was identified upon thoracic radiographic imaging of the ferret. Tracheoscopy and a computed tomography scan of the neck and thorax confirmed the presence of a tracheal mass approximately 3 cm from the larynx obstructing 80% of the tracheal lumen. Rather than pursuing surgical resection, the owners elected humane euthanasia. An adenosquamous carcinoma of the trachea was diagnosed after histologic analysis. This tumor type has been diagnosed in the lungs of ferrets that were experimentally exposed to carcinogens found in cigarette smoke; however, there are no previous reports of this or any other tumor type associated with the ferret trachea. A tracheal mass causing a partial upper airway obstruction should be considered within the differential disease diagnosis list when a ferret is presented with dyspnea. 相似文献