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  • Animals  (27)
  • Chemical Engineering  (19)
  • 2015-2019  (13)
  • 1985-1989  (28)
  • 1970-1974  (5)
  • 1945-1949
  • 1
    Electronic Resource
    Electronic Resource
    A semi-empirical algorithm for flow balancing in multi-cavity transfer molding (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 749-761 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Multi-cavity transfer molding is an important process step in several electronic and photonic technologies. In some applications, uniform filling of the cavities of the mold, or mold balancing, is required. A semi-empirical flow model to predict mold filling patterns was developed. The algorithm is a one-dimensional network flow simulation that uses experimental pressure drop data to determine the volumetric flow rate through the gates and runners. A comprehensive experimental program was undertaken to determine these hydraulic resistances for different flow rates and mold geometries. A theoretical treatment is also described to compute hydraulic resistance from gate geometry. Uniform gate resistances provide unbalanced filling and higher velocities in the cavities. Balanced filling can significantly reduce the molding compound velocity and the flow induced stresses, but imperfect balancing compromises the benefits. Experimental filling patterns were obtained for two sets of gates. The agreement between the model and the experiments was satisfactory, and the discrepancies were attributed to correctable phenomena.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760291108
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  • 2
    Electronic Resource
    Electronic Resource
    “A semi-empirical algorithm for flow balancing in multi-cavity transfer molding” (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 1796-1796 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760292409
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  • 3
    Electronic Resource
    Electronic Resource
    A new approach to capillary viscometry of thermoset transfer molding compounds (1986)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 26 (1986), S. 1399-1404 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A new capillary rheometer incorporated in an instrumented transfer molding press has been developed. This rheometer is effective for determining the viscosity characteristics of thermoset molding compounds under both isothermal and typical molding conditions. In examples of the rheometer's utility, the power law indices of two commercial epoxy molding compounds have been determined to be approximately 0.7. Additionally it has been shown that preconditioning typical epoxy compounds at 47 percent relative humidity causes a viscosity decrease of about 40 percent owing to plasticization of the epoxy resin.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760262008
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  • 4
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    Site-specific integration of H-ras in transformed rat embryo cells (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-09-09
    Description: A karyotypic analysis was performed on seven independently derived clones of primary rat embryo cells transformed by the ras oncogene plus the cooperating oncogene myc. The transfected oncogenes were sometimes present in amplified copy number, with heterogeneity in the levels of amplification. Some chromosomal features, such as aberrantly banding regions and double-minute chromosomes, typical of cells carrying amplified genes, were also seen in three of the seven cell lines. Underlying this heterogeneity there was an unexpected finding. All seven lines showed a common integration site for ras on the q arm of rat chromosome 3 (3q12), though some lines also had other sites of integration. In four of the lines integration of ras was accompanied by deletion of the p arm of chromosome 3 or its possible translocation to chromosome 12.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McKenna, W G -- Nakahara, K -- Muschel, R J -- New York, N.Y. -- Science. 1988 Sep 9;241(4871):1325-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Radiation Oncology, University of Pennsylvania School of Medicine, Philadelphia 19104.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3045971" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chromosome Mapping ; Gene Amplification ; *Genes, ras ; Oncogenes ; Rats ; Recombination, Genetic ; Transformation, Genetic ; Translocation, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    A skin-inspired organic digital mechanoreceptor (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-10-17
    Description: Human skin relies on cutaneous receptors that output digital signals for tactile sensing in which the intensity of stimulation is converted to a series of voltage pulses. We present a power-efficient skin-inspired mechanoreceptor with a flexible organic transistor circuit that transduces pressure into digital frequency signals directly. The output frequency ranges between 0 and 200 hertz, with a sublinear response to increasing force stimuli that mimics slow-adapting skin mechanoreceptors. The output of the sensors was further used to stimulate optogenetically engineered mouse somatosensory neurons of mouse cortex in vitro, achieving stimulated pulses in accordance with pressure levels. This work represents a step toward the design and use of large-area organic electronic skins with neural-integrated touch feedback for replacement limbs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tee, Benjamin C-K -- Chortos, Alex -- Berndt, Andre -- Nguyen, Amanda Kim -- Tom, Ariane -- McGuire, Allister -- Lin, Ziliang Carter -- Tien, Kevin -- Bae, Won-Gyu -- Wang, Huiliang -- Mei, Ping -- Chou, Ho-Hsiu -- Cui, Bianxiao -- Deisseroth, Karl -- Ng, Tse Nga -- Bao, Zhenan -- New York, N.Y. -- Science. 2015 Oct 16;350(6258):313-6. doi: 10.1126/science.aaa9306.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Electrical Engineering, Stanford University, Stanford, CA, USA. ; Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA. ; Department of Bioengineering, Stanford University, Stanford, CA, USA. ; Department of Chemistry, Stanford University, Stanford, CA, USA. ; Department of Chemical Engineering, Stanford University, Stanford, CA, USA. ; Xerox Palo Alto Research Center, Palo Alto, CA, USA. ; Department of Chemical Engineering, Stanford University, Stanford, CA, USA. zbao@stanford.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26472906" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cerebral Cortex/cytology/physiology ; Hand/anatomy & histology/innervation/physiology ; Humans ; In Vitro Techniques ; *Mechanoreceptors ; Mice ; *Neural Prostheses ; Optogenetics ; Pressure ; Skin/*innervation ; *Touch ; Transcutaneous Electric Nerve Stimulation/*methods ; Transistors, Electronic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Algal toxin impairs sea lion memory and hippocampal connectivity, with implications for strandings (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-12-17
    Description: Domoic acid (DA) is a naturally occurring neurotoxin known to harm marine animals. DA-producing algal blooms are increasing in size and frequency. Although chronic exposure is known to produce brain lesions, the influence of DA toxicosis on behavior in wild animals is unknown. We showed, in a large sample of wild sea lions, that spatial memory deficits are predicted by the extent of right dorsal hippocampal lesions related to natural exposure to DA and that exposure also disrupts hippocampal-thalamic brain networks. Because sea lions are dynamic foragers that rely on flexible navigation, impaired spatial memory may affect survival in the wild.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cook, Peter F -- Reichmuth, Colleen -- Rouse, Andrew A -- Libby, Laura A -- Dennison, Sophie E -- Carmichael, Owen T -- Kruse-Elliott, Kris T -- Bloom, Josh -- Singh, Baljeet -- Fravel, Vanessa A -- Barbosa, Lorraine -- Stuppino, Jim J -- Van Bonn, William G -- Gulland, Frances M D -- Ranganath, Charan -- New York, N.Y. -- Science. 2015 Dec 18;350(6267):1545-7. doi: 10.1126/science.aac5675. Epub 2015 Dec 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Neuropolicy, Emory University, Atlanta, GA 30322, USA. Pinniped Cognition and Sensory Systems Laboratory, Institute of Marine Sciences, University of California-Santa Cruz, Santa Cruz, CA 95060, USA. pfcook@emory.edu. ; Pinniped Cognition and Sensory Systems Laboratory, Institute of Marine Sciences, University of California-Santa Cruz, Santa Cruz, CA 95060, USA. ; Dynamic Memory Lab, Center for Neuroscience, University of California-Davis, Davis, CA 95618, USA. ; AnimalScan Advanced Veterinary Imaging, Redwood City, CA 94063, USA. ; Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA. ; The Marine Mammal Center, Sausalito, CA 94965, USA. ; Shedd Aquarium, Chicago, IL 60605, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26668068" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Eutrophication ; Hippocampus/*drug effects/physiology ; Kainic Acid/*analogs & derivatives/metabolism/toxicity ; Marine Toxins/*toxicity ; Neurotoxins/metabolism/*toxicity ; Sea Lions/*physiology ; Spatial Memory/*drug effects ; Thalamus/drug effects/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    The calcium sensor synaptotagmin 7 is required for synaptic facilitation (2016)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2016-01-08
    Description: It has been known for more than 70 years that synaptic strength is dynamically regulated in a use-dependent manner. At synapses with a low initial release probability, closely spaced presynaptic action potentials can result in facilitation, a short-term form of enhancement in which each subsequent action potential evokes greater neurotransmitter release. Facilitation can enhance neurotransmitter release considerably and can profoundly influence information transfer across synapses, but the underlying mechanism remains a mystery. One proposed mechanism is that a specialized calcium sensor for facilitation transiently increases the probability of release, and this sensor is distinct from the fast sensors that mediate rapid neurotransmitter release. Yet such a sensor has never been identified, and its very existence has been disputed. Here we show that synaptotagmin 7 (Syt7) is a calcium sensor that is required for facilitation at several central synapses. In Syt7-knockout mice, facilitation is eliminated even though the initial probability of release and the presynaptic residual calcium signals are unaltered. Expression of wild-type Syt7 in presynaptic neurons restored facilitation, whereas expression of a mutated Syt7 with a calcium-insensitive C2A domain did not. By revealing the role of Syt7 in synaptic facilitation, these results resolve a longstanding debate about a widespread form of short-term plasticity, and will enable future studies that may lead to a deeper understanding of the functional importance of facilitation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4729191/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4729191/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jackman, Skyler L -- Turecek, Josef -- Belinsky, Justine E -- Regehr, Wade G -- NS032405/NS/NINDS NIH HHS/ -- P30 NS072030/NS/NINDS NIH HHS/ -- R01 NS032405/NS/NINDS NIH HHS/ -- England -- Nature. 2016 Jan 7;529(7584):88-91. doi: 10.1038/nature16507.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Harvard Medical School, 220 Longwood Avenue, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26738595" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/*metabolism ; Calcium Signaling ; Female ; Male ; Mice ; Mice, Knockout ; Neuronal Plasticity ; Neurons/metabolism/secretion ; Neurotransmitter Agents/*secretion ; Presynaptic Terminals/metabolism ; Synapses/*metabolism/secretion ; *Synaptic Transmission ; Synaptotagmins/deficiency/genetics/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 8
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    Sodium-calcium exchange in heart: membrane currents and changes in [Ca2+]i (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-12-18
    Description: Recordings have been made of changes in intracellular calcium ion concentration ([Ca2+]i) that can be attributed to the operation of an electrogenic, voltage-dependent sodium-calcium (Na-Ca) exchanger in mammalian heart cells. Guinea pig ventricular myocytes under voltage clamp were perfused internally with fura-2, a fluorescent Ca2+-indicator, and changes in [Ca2+]i and membrane current that resulted from Na-Ca exchange were identified through the use of various organic channel blockers and impermeant ions. Depolarization of cells elicited slow increases in [Ca2+]i, with the maximum increase depending on internal [Na+], external [Ca2+], and membrane voltage. Repolarization was associated with net Ca2+ efflux and a decline in the inward current that developed instantaneously upon repolarization. The relation between [Ca2+]i and current was linear, and the slope was made steeper by hyperpolarization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barcenas-Ruiz, L -- Beuckelmann, D J -- Wier, W G -- HL29473/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1987 Dec 18;238(4834):1720-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of Maryland School of Medicine, Baltimore.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3686010" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/*metabolism ; Carrier Proteins/*physiology ; Cell Membrane/physiology ; Guinea Pigs ; Heart/*physiology ; In Vitro Techniques ; Kinetics ; Membrane Potentials ; Sodium-Calcium Exchanger ; Ventricular Function
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Dissociation of antitumor potency from anthracycline cardiotoxicity in a doxorubicin analog (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-06-28
    Description: The search for new congeners of the leading anticancer drug doxorubicin has led to an analog that is approximately 1000 times more potent, noncardiotoxic at therapeutic dose levels, and non-cross-resistant with doxorubicin. The new anthracycline, 3'-deamino-3'-(3-cyano-4-morpholinyl)doxorubicin (MRA-CN), is produced by incorporation of the 3' amino group of doxorubicin in a new cyanomorpholinyl ring. The marked increase in potency was observed against human ovarian and breast carcinomas in vitro; it was not accompanied by an increase in cardiotoxicity in fetal mouse heart cultures. Doxorubicin and MRA-CN both produced typical cardiac ultrastructural and biochemical changes, but at equimolar concentrations. In addition, MRA-CN was not cross-resistant with doxorubicin in a variant of the human sarcoma cell line MES-SA selected for resistance to doxorubicin. Thus antitumor efficacy was dissociated from both cardiotoxicity and cross-resistance by this modification of anthracycline structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sikic, B I -- Ehsan, M N -- Harker, W G -- Friend, N F -- Brown, B W -- Newman, R A -- Hacker, M P -- Acton, E M -- CA 24543/CA/NCI NIH HHS/ -- CA 32250/CA/NCI NIH HHS/ -- CA 33303/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1985 Jun 28;228(4707):1544-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/4012308" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antineoplastic Agents ; Breast Neoplasms/drug therapy ; Cell Line ; Chemical Phenomena ; Chemistry ; Dose-Response Relationship, Drug ; Doxorubicin/adverse effects/*analogs & derivatives/therapeutic use ; Female ; Heart/drug effects ; Humans ; Isoenzymes ; L-Lactate Dehydrogenase/analysis ; Mice ; Myocardium/enzymology ; Ovarian Neoplasms/drug therapy ; Pregnancy
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Receptor-associated resistance to growth hormone-releasing factor in dwarf "little" mice (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-04-25
    Description: Anterior pituitaries from the dwarf mouse strain "little" did not release growth hormone or accumulate adenosine 3',5'-monophosphate (cyclic AMP) in response to human and rat growth hormone-releasing factor (GRF). Dibutyryl cyclic AMP, as well as the adenylate cyclase stimulators forskolin and cholera toxin, markedly stimulated growth hormone (GH) release. The basis of the GH deficiency in the little mouse may therefore be a defect in an early stage of GRF-stimulated GH release related either to receptor binding or to the function of the hormone-receptor complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jansson, J O -- Downs, T R -- Beamer, W G -- Frohman, L A -- AM 17947/AM/NIADDK NIH HHS/ -- AM 30667/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1986 Apr 25;232(4749):511-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3008329" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Colforsin/pharmacology ; Cyclic AMP/analysis ; Dwarfism, Pituitary/*physiopathology ; Female ; Growth Hormone-Releasing Hormone/metabolism/pharmacology/physiology/secretion ; Humans ; Mice ; Mice, Inbred C57BL ; Mice, Mutant Strains/*physiology ; Pituitary Gland, Anterior/analysis/drug effects/physiopathology/secretion ; Receptors, Cell Surface/metabolism/*physiology ; *Receptors, Neuropeptide ; *Receptors, Pituitary Hormone-Regulating Hormone
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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