6076
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Luo XM, Wei HJ, Yang CL, Xing J, Liu X, Qiao CH, Feng YM, Liu J, Liu YX, Wu Q. Bioavailability of selenium to residents in a low-selenium area of China. Am J Clin Nutr 1985; 42:439-48. [PMID: 4036848 DOI: 10.1093/ajcn/42.3.439] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
For 8 wk 5 groups of 10 men each were given 0.5 g/day DL-methionine, 150 micrograms Se/day as sodium selenite with or without methionine or 150 micrograms Se/day as selenomethionine with or without methionine. Twenty subjects received placebo as controls. Initially plasma Se rose more rapidly than RBC Se. Increases in Se levels were significantly greater with selenomethionine than with the selenite supplement. In the placebo and methionine supplemented groups neither plasma nor RBC Se varied significantly over the course of the study. Supplementation with selenium resulted in marked increases in plasma and RBC GSH-Px within 2 and 4 wk, respectively. Plasma and RBC GSH-Px activity did not differ significantly between Se-supplemented groups. These studies suggest that selenomethionine-Se was more effective in raising plasma and RBC Se than was selenite-Se. Methionine supplements may increase the bioavailability of selenium in severely deficient subjects.
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6077
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Liu J. [The ultrastructure of human osteosarcoma]. ZHONGHUA BING LI XUE ZA ZHI = CHINESE JOURNAL OF PATHOLOGY 1985; 14:208-10. [PMID: 2936480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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6078
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Liu J. [Observation of the middle meningeal sinuses in the Chinese]. ZHONGHUA FANG SHE XUE ZA ZHI CHINESE JOURNAL OF RADIOLOGY 1985; 19:221-4. [PMID: 2932314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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6079
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Chen Y, Liu J, Yu Q. [Choosing the best population development goal]. REN KOU YAN JIU = RENKOU YANJIU 1985:9-11. [PMID: 12159286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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6080
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Liu J, McNicholl P, Harmin DA, Ivri J, Bergeman T, Metcalf HJ. Interference narrowing at crossings of sodium Stark resonances. PHYSICAL REVIEW LETTERS 1985; 55:189-192. [PMID: 10032024 DOI: 10.1103/physrevlett.55.189] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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6081
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Luo XM, Wei HJ, Yang CL, Xing J, Qiao CH, Feng YM, Liu J, Liu Z, Wu Q, Liu YX. Selenium intake and metabolic balance of 10 men from a low selenium area of China. Am J Clin Nutr 1985; 42:31-7. [PMID: 4014065 DOI: 10.1093/ajcn/42.1.31] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Selenium intake and urinary and fecal Se excretion of 10 healthy men from a low Se area in China were determined for three consecutive days, in summer, fall, and winter of 1983, and the spring of 1984 while self-selected diets were being consumed. Mean daily Se intake was 8.8 micrograms/day with a range of 2.3-35.5 micrograms/day, and was far below the recommended range of safe and adequate Se intake of 50-200 micrograms Se/day (National Academy of Sciences/National Research Council). Mean urinary and fecal Se outputs were 3.7 and 3.4 micrograms Se/day, respectively. Mean Se balance during this time was +1.8 micrograms Se/day. Apparent absorption of Se approximated 57%. The low Se intake in this area is a cause for concern since the residents of Molimo may be at risk for Se deficiency diseases.
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6082
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Liu J, Geller J, Albert J, Kirshner M. Acute effects of testicular and adrenal cortical blockade on protein synthesis and dihydrotestosterone content of human prostate tissue. J Clin Endocrinol Metab 1985; 61:129-33. [PMID: 2581988 DOI: 10.1210/jcem-61-1-129] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
To examine the relationship between whole prostatic dihydrotestosterone (DHT) concentrations and epithelial and stromal protein synthesis, patients awaiting surgery for benign prostatic hypertrophy were given medication to reduce circulating and tissue androgen levels for comparison to levels in untreated patients. The medications, either megestrol acetate, a progestational antiandrogen, or megestrol acetate plus dexamethasone, were given for 1 week before surgery. Aliquots of prostate tissue obtained at surgery were assayed for DHT. The remainder of the tissue was separated into stromal and epithelial cells using enzymatic separation; the incorporation of both [3H] proline into stromal protein and [3H]leucine into epithelial cell protein was then measured. Over a wide range of tissue DHT concentrations, DHT correlated significantly with [3H]proline incorporation into stromal protein (r = 0.58). Likewise, epithelial cell incorporation of [3H]leucine into protein correlated significantly with tissue DHT concentrations, with a r value of 0.79. In the case of stromal cells, no additional effects of dexamethasone given with megestrol acetate were found on stromal protein synthesis. Epithelial cell [3H]leucine incorporation into protein was paradoxically enhanced by dexamethasone plus megestrol acetate compared to the latter alone, despite the fact that tissue DHT and circulating adrenal androgens, dehydroepiandrosterone sulfate and delta 4-androstenedione, were not significantly different from values obtained after treatment with megestrol acetate alone. These studies support the conclusion that there is a dominant role of DHT in regulating protein synthesis in both prostatic epithelial and stromal cells. Dexamethasone appears to have a growth-stimulating effect on prostatic epithelial cells.
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6083
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Liu J. [A comparative study of thyroid adenoma under isotope scanning and transmission electron microscopy (TEM)]. ZHONGHUA BING LI XUE ZA ZHI = CHINESE JOURNAL OF PATHOLOGY 1985; 14:133-4. [PMID: 2935295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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6084
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Liu J. [An analysis of refraction and position of the eye among students with normal eye sight]. [ZHONGHUA YAN KE ZA ZHI] CHINESE JOURNAL OF OPHTHALMOLOGY 1984; 20:352-4. [PMID: 6442689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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6085
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Schaeffer JM, Liu J, Hsueh AJ, Yen SS. Presence of oxytocin and arginine vasopressin in human ovary, oviduct, and follicular fluid. J Clin Endocrinol Metab 1984; 59:970-3. [PMID: 6480815 DOI: 10.1210/jcem-59-5-970] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Oxytocin and arginine vasopressin (AVP) immunoreactivity in human ovary, oviduct, and follicular fluid were measured and found to coelute with the authentic peptides using both gel filtration column chromatography and reverse phase thin layer chromatography. In ovarian tissue, mean oxytocin and AVP concentrations were 0.48 and 0.24 ng/mg protein, respectively. These values are approximately 4000-fold higher than peripheral plasma levels. The concentration of oxytocin in the corpus luteum was approximately 6-fold greater (3.12 ng/mg protein) than that in ovarian tissue with no corpus luteum. In contrast, no significant difference in the concentration of AVP was found between corpus luteal and the remaining ovarian tissues. Follicular fluid contained 299 and 131 pg/ml oxytocin and AVP, respectively. These levels were 30-fold greater than the serum level of either peptide, suggesting ovarian synthesis of the neurohypophyseal hormones. In addition, immunoreactive oxytocin and AVP were detected in the oviducts (1.01 and 0.24 ng/mg protein, respectively); however, neither peptide was detectable in myometrial tissue (less than 0.02 ng/mg protein). Our results demonstrate the presence of high concentrations of oxytocin and AVP in human ovarian and oviductal tissues as well as follicular fluid and suggest that neurohypophyseal peptides have a paracrine role in the regulation of ovarian or oviductal functions.
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6086
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Liu J. [Determination of iodine in iodized salt]. ZHONGHUA YU FANG YI XUE ZA ZHI [CHINESE JOURNAL OF PREVENTIVE MEDICINE] 1984; 18:372-3. [PMID: 6543747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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6087
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Liu J, Albert JD, Geller J, Faber LE. Effect of tamoxifen on stromal protein synthesis in the human prostate. J Clin Endocrinol Metab 1984; 59:710-3. [PMID: 6480804 DOI: 10.1210/jcem-59-4-710] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
To test the hypothesis that estrogen may have significant biological effects on the human prostate, we studied the effects of in vivo administration of tamoxifen, an antiestrogen, on human prostatic stromal protein synthesis in vitro. This was done by measuring [3H]proline incorporation in vitro in stromal cells separated enzymatically with 0.5% collagenase and trypsin from hypertrophic prostatic tissue removed at surgery. A mechanical method for separation of epithelium and stroma was attempted, but cell damage resulted in very low incorporation of [3H]proline into protein. Twelve patients were given 20 mg tamoxifen twice daily for 10 days before surgery. The serum levels of tamoxifen at the time of surgery ranged from 200-500 pmol/ml. Control tissues (14) were obtained from untreated patients. Tamoxifen decreased stromal protein synthesis, as measured by counts per min/mg protein, to approximately one third of that found in control patients (control mean, 102,428; tamoxifen-treated mean, 34,111; P less than 0.01). These results support the concept that estrogen has a significant role in the regulation of stromal protein synthesis and the pathophysiology of benign prostatic hypertrophy.
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6088
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Stark L, Ciuffreda KJ, Grisham JD, Kenyon RV, Liu J, Polse K. Accommodative disfacility presenting as intermittent exotropia. Ophthalmic Physiol Opt 1984; 4:233-44. [PMID: 6472853 DOI: 10.1111/j.1475-1313.1984.tb00361.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Accommodative disfacility and intermittent exotropia are two common clinically-observed ocular abnormalities. However, records of individual system dynamics are rare and mechanisms for possible interactive effects between the accommodation and the vergence system remain obscure in cases of system dysfunction. We present objective, quantitative, static and dynamic records of accommodation, vergence and related system responses in a symptomatic patient having accommodation disfacility and intermittent exotropia and propose that these two conditions worked in a pathogenic symbiotic manner.
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6089
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Royston DD, Geng Z, Liu J. Silicon radiometer whose response is independent of operating temperature. APPLIED OPTICS 1984; 23:785-786. [PMID: 20424679 DOI: 10.1364/ao.23.000785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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6090
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Reisler E, Liu J, Cheung P. Role of magnesium binding to myosin in controlling the state of cross-bridges in skeletal rabbit muscle. Biochemistry 1983; 22:4954-60. [PMID: 6685530 DOI: 10.1021/bi00290a012] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The effect of Mg2+ on the disposition of myosin cross-bridges was studied on myofibrils and synthetic myosin and rod filaments by employing chymotryptic digestion and chemical cross-linking methods. In the presence of low Mg2+ concentrations (0.1 mM), the proteolytic susceptibility at the heavy meromyosin/light meromyosin (HMM/LMM) junction in these three systems sharply increases over the pH range from 7.0 to 8.2. Such a change has been previously associated with the release of myosin cross-bridges from the filament surface [Ueno, H., & Harrington, W.F. (1981) J. Mol. Biol. 149, 619-640]. Millimolar concentrations of Mg2+ block or reverse this charge-dependent transition. Rod filaments show the same behavior as myosin filaments, indicating that the low-affinity binding sites for Mg2+ are located on the rod portion of myosin. The interpretation of these results in terms of Mg2+-mediated binding of cross-bridges to the filament backbone is supported by cross-linking experiments. The normalized rate of S-2 cross-linking in rod filaments at pH 8.0, kS-2/kLMM, increases upon addition of Mg2+ from 0.30 to 0.65 and approaches the cross-linking rate measured at pH 7.0 (0.75), when the cross-bridges are close to the filament surface. In rod filaments prepared from oxidized rod particles, chymotryptic digestion proceeds both at the S-2/LMM junction and at a new cleavage site located in the N-terminal portion of the molecule. Kinetic analysis of digestion rates at these two sites reveals that binding of Mg2+ to oxidized myosin rods has a similar effect at both sites over the pH range from 7.0 to 8.0.(ABSTRACT TRUNCATED AT 250 WORDS)
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6091
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Liu J, Rebar RW, Yen SS. Neuroendocrine control of the postpartum period. Clin Perinatol 1983; 10:723-36. [PMID: 6418431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
This postpartum period is characterized by stimulation of lactation and suppression of ovulation. During pregnancy a number of hormonal changes prepare the breasts for lactation following delivery. The process of lactation is functionally related to the suppression of ovulation. These two physiologic changes observed in the puerperium are considered in detail in this review.
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6092
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Liu J. [Effect of Paeonia obovata 801 on metabolism of thromboxane B2 and arachidonic acid and on platelet aggregation in patients with coronary heart disease and cerebral thrombosis]. ZHONGHUA YI XUE ZA ZHI 1983; 63:477-81. [PMID: 6418338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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6093
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Aitken RJ, Liu J, Best FS, Richardson DW. An analysis of the direct effects of gossypol on human spermatozoa. INTERNATIONAL JOURNAL OF ANDROLOGY 1983; 6:157-67. [PMID: 6862672 DOI: 10.1111/j.1365-2605.1983.tb00334.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The direct effects of gossypol and its acetic acid adduct, on the movement and functional competence of human spermatozoa were investigated employing exposure times of 1, 5 or 15 min and concentrations of 50 microM, 500 microM and 1000 microM. These compounds markedly reduced the motility, velocity, frequency of sperm head rotation and linearity of sperm progression, the most significant effects being observed with gossypol acetic acid on populations of 'capacitated' spermatozoa. Significant direct effects of gossypol on the ability of human spermatozoa to penetrate both cervical mucus and zona-free hamster ova were also observed, which were independent of any effects on motility. These results reinforce the notion that gossypol may serve a contraceptive role in the female as a 'spermicidal' agent, and suggest that this compound may also be of scientific value as a probe for identifying and isolating functionally important components of the human spermatozoon.
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6094
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Liu J. [Ultrastructural study on nodular endemic goiter]. ZHONGHUA YI XUE ZA ZHI 1983; 63:228-31. [PMID: 6413021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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6095
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Aitken RJ, Wang YF, Liu J, Best F, Richardson DW. The influence of medium composition, osmolarity and albumin content on the acrosome reaction and fertilizing capacity of human spermatozoa: development of an improved zona-free hamster egg penetration test. INTERNATIONAL JOURNAL OF ANDROLOGY 1983; 6:180-93. [PMID: 6862673 DOI: 10.1111/j.1365-2605.1983.tb00337.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The influence of medium composition, osmolarity and albumin concentration on the ability of human spermatozoa to undergo the acrosome reaction and penetrate zona-free hamster ova has been investigated. Raising the osmolarity but not the albumin concentration of the media was found to significantly increase the proportion of spermatozoa exhibiting an acrosome reaction and penetrating hamster ova, without influencing motility. There was, however, no correlation between the size of the acrosome reacted population and penetration rates between samples, suggesting that the zona-free hamster egg penetration test is more than just a measure of the availability of acrosome reacted cells. As a result of this study, a revised protocol for the hamster egg assay is described which is shorter and considerably more sensitive than conventional procedures.
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6096
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6097
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Liu J, Tuhrim S, Weinberger J, Song SK, Anderson PJ. Premonitory symptoms of stroke in evolution to the locked-in state. J Neurol Neurosurg Psychiatry 1983; 46:221-6. [PMID: 6842229 PMCID: PMC1027328 DOI: 10.1136/jnnp.46.3.221] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Three patients, who subsequently developed the locked-in state characterised by quadriplegia and mutism with an alert sensorium, initially had mild dysarthria and uncrossed hemisensory or hemimotor deficits involving the face and ipsilateral extremities. Case one initially mimicked a left cerebral lesion with right hemisensory deficits, a mild right facial paresis and a right homonymous field deficit. Case two initially developed both left hemimotor and hemisensory deficits and later developed a paresis of right conjugate gaze. Case three presented with left hemimotor deficit, and mild paresis of conjugate gaze to the right. All three patients died. Rostral brainstem infarctions were found at necropsy in cases one and two. Case three had a radiolucent area of the brainstem demonstrated by CT Scan. Hemisensory and hemimotor deficits also have been noted to precede reported cases of pontine infarction with the locked-in state. Acute onset of uncrossed hemisensory and hemimotor deficits with dysarthria may be caused by infarction of the pons which may predispose to the locked-in state.
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6098
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Xu Y, Liu J, Yang M. [A study of the prenatal growth and development of the temporomandibular joint (TMJ)]. SICHUAN YI XUE YUAN XUE BAO = ACTA ACADEMIAE MEDICINAE SICHUAN 1983; 14:1-7. [PMID: 6573027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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6099
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Liu J. In-depth study of Marxist population theory, promote China's population science. POPULATION RESEARCH (PEKING, CHINA) 1983; 1:60-4. [PMID: 12313987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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6100
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Liu J, Kong QY, Ye GY, Xia MY, Huang L, Zhu WY. Observations on ultrastructure of histoid leproma. INTERNATIONAL JOURNAL OF LEPROSY AND OTHER MYCOBACTERIAL DISEASES : OFFICIAL ORGAN OF THE INTERNATIONAL LEPROSY ASSOCIATION 1982; 50:471-6. [PMID: 6892023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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