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PubMed1994

Sperm-egg recognition in the mouse: characterization of sp56, a sperm protein having specific affinity for ZP3.

Recognition between mammalian gametes occurs when the plasma membrane of the sperm head binds to the zona pellucida (ZP), an extracellular coat surrounding eggs. ZP3, one of three glycoproteins in the ZP, is the egg protein recognized by sperm. A mouse sperm surface protein, sp56 (M(r) = 56,000), has been identified on the basis of its specific affinity for ZP3 (Bleil, J. D., and P. M. Wassarman. 1990. Proc. Natl. Acad. Sci. USA. 87:5563-5567). Studies presented here were designed to characterize mouse sperm sp56 and to further test whether or not this protein specifically recognizes ZP3. sp56 was purified by both ZP3 affinity chromatography and by ion exchange chromatography followed by size-exclusion chromatography. The purified native protein eluted from size-exclusion columns as a homomultimer (M(r) approximately 110,000). Each monomer of the protein contains intramolecular disulfide bonds, consistent with its extracellular location. Immunohistochemical and immunoblotting studies, using monoclonal antibodies, demonstrated that sp56 is a peripheral membrane protein located on the outer surface of the sperm head plasma membrane, precisely where sperm bind ZP3. Results of crosslinking experiments demonstrated that the ZP3 oligosaccharide recognized by sperm has specific affinity for sp56. Collectively, these results suggest that sp56 may be the sperm protein responsible for sperm-egg recognition in the mouse.

Amino Acid Sequence↗

PubMed1998

Chest tube insertion: a prospective evaluation of pain management.

OBJECTIVE: To evaluate pain associated with chest tube insertion in a group of patients with malignant pleural effusions. DESIGN: Prospective case series. SETTING: Acute care cancer center in an academic institution. PATIENTS: Fifty-two patients with symptomatic malignant pleural effusions. Twenty-six evaluated by conventional approach to chest tube insertion (group 1), 26 evaluated after institution of a new chest tube protocol (group 2). INTERVENTIONS: A new protocol was designed to improve pain control during chest tube insertion. The protocol included improved housestaff and nursing education, premedication, proper insertion techniques, and more liberal and precise delivery of local anesthetic. OUTCOME MEASURES: Both groups were evaluated by a verbal self-report scale (1-10) to assess pain and anxiety. RESULTS: The mean pain rating in group 1 was 6.2 (+/-0.76) compared with 3.7 (+/-5.6) in group 2 (p < 0.01). In group 1, pain or anxiety was 9 or 10 in 12 of 26 on a scale of 1 to 10, compared with 2 of 26 in group 2 (p < 0.001). Anxiety rating was 4.5 (+/-0.72) in group 1 compared with 1.5 (+/-0.54) in group 2 (p < 0.01). CONCLUSIONS: Chest tube insertion was associated with an unacceptably high level of pain and anxiety in our hospital. A new protocol, including housestaff education and changes in nursing policies, technical aspects, local anesthetic dose and delivery, and pre-medication, allowed us to approach the goal of a painless chest tube insertion.

Anxiety↗

PubMed1982

Mediastinal pseudocyst.

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Amylases↗

PubMed1975

Textbooks -- a new approach.

A new approach to medical textbooks has been applied by a team comprising a publisher, educationalist, and subject specialist. The binding of the book can be opened so that additional material can be added and the pages rearranged. Illustrations are printed on separate sheets so as to be available for study at any point in the text. An interdisciplinary approach has been adopted throughout and each section of the book examines the subject from a different viewpoint, for example, a disease, a clinical presentation, or an approach to therapy. An important feature is the separation of core material from additional material. Layout and design have been used to facilitate learning and to make possible the use of the book for reference and revision.

Bookbinding↗

PubMed1983

5-day storage of platelet concentrates in CLX containers: effect of type of agitation.

To determine the degree of platelet damage produced by different modes of agitation during storage of concentrates for 5 days in CLX blood bags, we studied pH, platelet counts, release of LDH and beta thromboglobulin, morphology and osmotic recovery. Platelets were maintained at 20-24 degrees C on elliptical, 6-rpm circular, 2-rpm circular and flat bed agitators. At 72-120 h platelet concentrates stored on the flat bed shaker had significantly lower pH values than units stored on the elliptical or on either of the circular rotators (p less than 0.05). The percent LDH discharged was highest for the units stored on the elliptical rotator (p less than 0.05). Remaining tests of platelet function were not significantly different for concentrates stored on any of the four agitators. Flat bed shakers were unable to resuspend the platelet 'button' which formed after the final preparative centrifugation. Based on our in vitro studies, we conclude that due to problems with low pH values, flat bed shakers may not be optimal for storing platelet concentrates in CLX blood bags and that some other form of agitation should be used.

Blood Platelets↗

PubMed1983

A new deal or dashed hopes?

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Child↗

PubMed1992

Allergic contact dermatitis from nickel with unusual localization.

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Arm↗

PubMed1995

Tissue- and species-specific expression of sp56, a mouse sperm fertilization protein.

Mouse sperm recognize and bind to ZP3, one of three glycoproteins in the egg's zona pellucida. A mouse sperm protein, sp56, was identified that has the characteristics expected of the sperm protein responsible for recognition of ZP3. The complementary DNA encoding sp56 was isolated, and its primary sequence indicates that sp56 is a member of a superfamily of protein receptors. It was shown that sp56 expression is restricted to mouse spermatids and that the presence or absence of sp56 on sperm from different species accounts for species specificity of sperm-egg recognition in mice.

Amino Acid Sequence↗

PubMed1988

Detection of renal masses: sensitivities and specificities of excretory urography/linear tomography, US, and CT.

A prospective blinded study of 201 patients was performed to determine the relative sensitivities and specificities of excretory urography/linear tomography (EU/LT) and ultrasound (US) for the diagnosis of renal parenchymal masses. Computed tomography (CT) was used as a standard. EU/LT permitted detection of 10% of CT-confirmed masses (cystic or solid) less than 1 cm, 21% of lesions greater than or equal to 1 cm but less than 2 cm, 52% of lesions greater than or equal to 2 cm but less than 3 cm, and 85% of lesions 3 cm or more in diameter. US permitted detection of 26% of CT-confirmed lesions less than 1 cm, 60% of lesions greater than or equal to 1 cm but less than 2 cm, 82% of lesions greater than or equal to 2 cm but less than 3 cm, and 85% of lesions 3 cm or more in size. The results confirm the relative insensitivity of EU/LT for masses less than 3 cm in diameter and of US for masses less than 2 cm. Further, they suggest that CT may have a role not only in evaluation of cases in which the urographic or sonographic results are questionable or positive, but also in confirmation of apparently negative urographic findings when clinical suspicion of a lesion is high.

Carcinoma, Renal Cell↗

PubMed1993

Parental visitation in the post-anesthesia care unit: a means to lessen anxiety.

Programs that assist parents and children with coping during hospitalization may minimize the emotional trauma of hospitalization and improve both child and family well-being. The purpose of this study was to determine the effect of parental visitation in the Post-Anesthesia Care Unit (PACU) on pre- and postoperative anxiety levels of pediatric patients and parents. Sixty-eight patient-parent pairs were enrolled in the study: 20 before implementing parental visitation and 48 following implementation. Although no differences were found in children's anxiety levels pre- to postoperatively, the anxiety levels of parents who visited their children in the PACU were significantly lower postoperatively.

Adaptation, Psychological↗

PubMed1982